The full dataset viewer is not available (click to read why). Only showing a preview of the rows.
The dataset generation failed
Error code: DatasetGenerationError
Exception: ArrowInvalid
Message: JSON parse error: Column(/src/[]) changed from string to number in row 0
Traceback: Traceback (most recent call last):
File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/packaged_modules/json/json.py", line 174, in _generate_tables
df = pandas_read_json(f)
File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/packaged_modules/json/json.py", line 38, in pandas_read_json
return pd.read_json(path_or_buf, **kwargs)
File "/src/services/worker/.venv/lib/python3.9/site-packages/pandas/io/json/_json.py", line 815, in read_json
return json_reader.read()
File "/src/services/worker/.venv/lib/python3.9/site-packages/pandas/io/json/_json.py", line 1025, in read
obj = self._get_object_parser(self.data)
File "/src/services/worker/.venv/lib/python3.9/site-packages/pandas/io/json/_json.py", line 1051, in _get_object_parser
obj = FrameParser(json, **kwargs).parse()
File "/src/services/worker/.venv/lib/python3.9/site-packages/pandas/io/json/_json.py", line 1187, in parse
self._parse()
File "/src/services/worker/.venv/lib/python3.9/site-packages/pandas/io/json/_json.py", line 1403, in _parse
ujson_loads(json, precise_float=self.precise_float), dtype=None
ValueError: Trailing data
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/builder.py", line 1815, in _prepare_split_single
for _, table in generator:
File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/packaged_modules/json/json.py", line 177, in _generate_tables
raise e
File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/packaged_modules/json/json.py", line 151, in _generate_tables
pa_table = paj.read_json(
File "pyarrow/_json.pyx", line 308, in pyarrow._json.read_json
File "pyarrow/error.pxi", line 154, in pyarrow.lib.pyarrow_internal_check_status
File "pyarrow/error.pxi", line 91, in pyarrow.lib.check_status
pyarrow.lib.ArrowInvalid: JSON parse error: Column(/src/[]) changed from string to number in row 0
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 1456, in compute_config_parquet_and_info_response
parquet_operations = convert_to_parquet(builder)
File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 1055, in convert_to_parquet
builder.download_and_prepare(
File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/builder.py", line 894, in download_and_prepare
self._download_and_prepare(
File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/builder.py", line 970, in _download_and_prepare
self._prepare_split(split_generator, **prepare_split_kwargs)
File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/builder.py", line 1702, in _prepare_split
for job_id, done, content in self._prepare_split_single(
File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/builder.py", line 1858, in _prepare_split_single
raise DatasetGenerationError("An error occurred while generating the dataset") from e
datasets.exceptions.DatasetGenerationError: An error occurred while generating the datasetNeed help to make the dataset viewer work? Make sure to review how to configure the dataset viewer, and open a discussion for direct support.
label_file
string | code_file
string | pid
string | sid
string | funname
string | start
int64 | end
int64 | dataset
string | language
string | src
int64 | dst
int64 | groundtruth
bool | task_id
string | prompt
string | category
string | src_transformed
dict | dst_transformed
dict |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
codenet_p00496_s700056700_main_12_40.yaml
|
codenet_p00496_s700056700_main_12_40.c
|
p00496
|
s700056700
|
main
| 12
| 40
|
codenet
|
C
| 30
| 33
| true
|
control_codenet_p00496_s700056700_main_12_40_k_33_1
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include <stdio.h>
2 #include <string.h>
3 #define max(a,b) ((a)>=(b)?(a):(b))
4 int dp[3001][3001];
5 char buf[30], *p;
6 int getint()
7 {
8 int n = 0;
9 while (*p >= '0') n = (n<<3) + (n<<1) + (*p++ & 0xf);
10 return n;
11 }
12 int main()
13 {
14 int a[3001];
15 int b[3001];
16 int n, t, s, i, j, k, ans;
17 fgets(p=buf, 30, stdin);
18 n = getint();
19 p++;
20 t = getint();
21 p++;
22 s = getint();
23 for (i = 1; i <= n; i++) {
24 fgets(p=buf, 30, stdin);
25 a[i] = getint();
26 p++;
27 b[i] = getint();
28 }
29 ans = 0;
30 for (i = 1; i <= n; i++)
31 for (j = 1; j <= t; j++) {
32 dp[i][j] = max(dp[i-1][j], dp[i][j-1]);
33 k = j-b[i];
34 if (k >= 0 && (s <= k || j <= s))
35 dp[i][j] = max(dp[i][j], dp[i-1][k] + a[i]);
36 ans = max(ans, dp[i][j]);
37 }
38 printf("%d\n", ans);
39 return 0;
40 }
```
**Question**: Does line `30` have control dependence over line `33` in function `main`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 30
}
|
{
"line": 33
}
|
codenet_p00496_s700056700_main_12_40.yaml
|
codenet_p00496_s700056700_main_12_40.c
|
p00496
|
s700056700
|
main
| 12
| 40
|
codenet
|
C
| 31
| 33
| true
|
control_codenet_p00496_s700056700_main_12_40_k_33_2
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include <stdio.h>
2 #include <string.h>
3 #define max(a,b) ((a)>=(b)?(a):(b))
4 int dp[3001][3001];
5 char buf[30], *p;
6 int getint()
7 {
8 int n = 0;
9 while (*p >= '0') n = (n<<3) + (n<<1) + (*p++ & 0xf);
10 return n;
11 }
12 int main()
13 {
14 int a[3001];
15 int b[3001];
16 int n, t, s, i, j, k, ans;
17 fgets(p=buf, 30, stdin);
18 n = getint();
19 p++;
20 t = getint();
21 p++;
22 s = getint();
23 for (i = 1; i <= n; i++) {
24 fgets(p=buf, 30, stdin);
25 a[i] = getint();
26 p++;
27 b[i] = getint();
28 }
29 ans = 0;
30 for (i = 1; i <= n; i++)
31 for (j = 1; j <= t; j++) {
32 dp[i][j] = max(dp[i-1][j], dp[i][j-1]);
33 k = j-b[i];
34 if (k >= 0 && (s <= k || j <= s))
35 dp[i][j] = max(dp[i][j], dp[i-1][k] + a[i]);
36 ans = max(ans, dp[i][j]);
37 }
38 printf("%d\n", ans);
39 return 0;
40 }
```
**Question**: Does line `31` have control dependence over line `33` in function `main`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 31
}
|
{
"line": 33
}
|
codenet_p00496_s700056700_main_12_40.yaml
|
codenet_p00496_s700056700_main_12_40.c
|
p00496
|
s700056700
|
main
| 12
| 40
|
codenet
|
C
| 23
| 33
| false
|
control_codenet_p00496_s700056700_main_12_40_k_33_3
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include <stdio.h>
2 #include <string.h>
3 #define max(a,b) ((a)>=(b)?(a):(b))
4 int dp[3001][3001];
5 char buf[30], *p;
6 int getint()
7 {
8 int n = 0;
9 while (*p >= '0') n = (n<<3) + (n<<1) + (*p++ & 0xf);
10 return n;
11 }
12 int main()
13 {
14 int a[3001];
15 int b[3001];
16 int n, t, s, i, j, k, ans;
17 fgets(p=buf, 30, stdin);
18 n = getint();
19 p++;
20 t = getint();
21 p++;
22 s = getint();
23 for (i = 1; i <= n; i++) {
24 fgets(p=buf, 30, stdin);
25 a[i] = getint();
26 p++;
27 b[i] = getint();
28 }
29 ans = 0;
30 for (i = 1; i <= n; i++)
31 for (j = 1; j <= t; j++) {
32 dp[i][j] = max(dp[i-1][j], dp[i][j-1]);
33 k = j-b[i];
34 if (k >= 0 && (s <= k || j <= s))
35 dp[i][j] = max(dp[i][j], dp[i-1][k] + a[i]);
36 ans = max(ans, dp[i][j]);
37 }
38 printf("%d\n", ans);
39 return 0;
40 }
```
**Question**: Does line `23` have control dependence over line `33` in function `main`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 23
}
|
{
"line": 33
}
|
codenet_p00496_s700056700_main_12_40.yaml
|
codenet_p00496_s700056700_main_12_40.c
|
p00496
|
s700056700
|
main
| 12
| 40
|
codenet
|
C
| 34
| 33
| false
|
control_codenet_p00496_s700056700_main_12_40_k_33_4
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include <stdio.h>
2 #include <string.h>
3 #define max(a,b) ((a)>=(b)?(a):(b))
4 int dp[3001][3001];
5 char buf[30], *p;
6 int getint()
7 {
8 int n = 0;
9 while (*p >= '0') n = (n<<3) + (n<<1) + (*p++ & 0xf);
10 return n;
11 }
12 int main()
13 {
14 int a[3001];
15 int b[3001];
16 int n, t, s, i, j, k, ans;
17 fgets(p=buf, 30, stdin);
18 n = getint();
19 p++;
20 t = getint();
21 p++;
22 s = getint();
23 for (i = 1; i <= n; i++) {
24 fgets(p=buf, 30, stdin);
25 a[i] = getint();
26 p++;
27 b[i] = getint();
28 }
29 ans = 0;
30 for (i = 1; i <= n; i++)
31 for (j = 1; j <= t; j++) {
32 dp[i][j] = max(dp[i-1][j], dp[i][j-1]);
33 k = j-b[i];
34 if (k >= 0 && (s <= k || j <= s))
35 dp[i][j] = max(dp[i][j], dp[i-1][k] + a[i]);
36 ans = max(ans, dp[i][j]);
37 }
38 printf("%d\n", ans);
39 return 0;
40 }
```
**Question**: Does line `34` have control dependence over line `33` in function `main`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 34
}
|
{
"line": 33
}
|
codenet_p00736_s631138606_F_3_85.yaml
|
codenet_p00736_s631138606_F_3_85.c
|
p00736
|
s631138606
|
F
| 3
| 85
|
codenet
|
C
| 42
| 50
| true
|
control_codenet_p00736_s631138606_F_3_85_fit_50_1
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include<stdio.h>
2 #include<string.h>
3 int F(int p,int q,int r,char ft[100],int fc){
4 int fit[100],ic,x,t;
5 ic=1;
6 for(t=0;t<100;t++){
7 fit[t]=0;
8 }
9 while(ic<fc){
10 if(ft[ic]=='P'){
11 fit[ic]=p;
12 }
13 if(ft[ic]=='Q'){
14 fit[ic]=q;
15 }
16 if(ft[ic]=='R'){
17 fit[ic]=r;
18 }
19 if(ft[ic]=='0'){
20 fit[ic]=0;
21 }
22 if(ft[ic]=='1'){
23 fit[ic]=1;
24 }
25 if(ft[ic]=='2'){
26 fit[ic]=2;
27 }
28 if(ft[ic]=='+'){
29 fit[ic]=3;
30 }
31 if(ft[ic]=='-'){
32 fit[ic]=4;
33 }
34 if(ft[ic]=='*'){
35 fit[ic]=5;
36 }
37 ic++;
38 }
39 ic--;
40 x=1;
41 while(x<ic){
42 if(fit[x]==3){
43 if(fit[x-1]==0&&fit[x-2]==0){
44 fit[x-2]=0;
45 }
46 else if(fit[x-1]==2||fit[x-2]==2){
47 fit[x-2]=2;
48 }
49 else{
50 fit[x-2]=1;
51 }
52 ic-=2;
53 for(t=x-1;t<=ic;t++){
54 fit[t]=fit[t+2];
55 }
56 x-=2;
57 }
58 if(fit[x]==4){
59 fit[x-1]=2-fit[x-1];
60 ic--;
61 for(t=x;t<=ic;t++){
62 fit[t]=fit[t+1];
63 }
64 x--;
65 }
66 if(fit[x]==5){
67 if(fit[x-1]==0||fit[x-2]==0){
68 fit[x-2]=0;
69 }
70 else if(fit[x-1]==2&&fit[x-2]==2){
71 fit[x-2]=2;
72 }
73 else{
74 fit[x-2]=1;
75 }
76 ic-=2;
77 for(t=x-1;t<=ic;t++){
78 fit[t]=fit[t+2];
79 }
80 x-=2;
81 }
82 x++;
83 }
84 return fit[1];
85 }
86 int main(void){
87 int c,nc,oc,fc;
88 char txt[100],ng[100],op[100],ft[100];
89 while(1){
90 scanf("%s",&txt);
91 if(txt[0]=='.'){
92 break;
93 }
94 nc=oc=fc=0;
95 for(c=0;c<strlen(txt);c++){
96 if(txt[c]==0||txt[c]==1||txt[c]==2||txt[c]=='P'||txt[c]=='Q'||txt[c]=='R'){
97 fc++;
98 ft[fc]=txt[c];
99 if(nc!=0){
100 while(nc!=0){
101 fc++;
102 ft[fc]=ng[nc];
103 nc--;
104 }
105 }
106 }
107 if(txt[c]=='+'){
108 if(oc==0||op[oc]=='('){
109 oc++;
110 op[oc]=txt[c];
111 }
112 else{
113 while(oc!=0){
114 fc++;
115 ft[fc]=op[oc];
116 oc--;
117 }
118 oc++;
119 op[oc]=txt[c];
120 }
121 }
122 if(txt[c]=='*'){
123 if(oc==0||op[oc]=='+'||op[oc]=='('){
124 oc++;
125 op[oc]=txt[c];
126 }
127 else{
128 while(oc!=0){
129 fc++;
130 ft[fc]=op[oc];
131 oc--;
132 }
133 oc++;
134 op[oc]=txt[c];
135 }
136 }
137 if(txt[c]=='('){
138 oc++;
139 op[oc]=txt[c];
140 }
141 if(txt[c]==')'){
142 while(op[oc]!='('){
143 fc++;
144 ft[fc]=op[oc];
145 oc--;
146 }
147 op[oc]=0;
148 oc--;
149 }
150 if(txt[c]=='-'){
151 nc++;
152 ng[nc]=txt[c];
153 }
154 }
155 if(oc!=0){
156 while(oc!=0){
157 fc++;
158 ft[fc]=op[oc];
159 oc--;
160 }
161 }
162 for(c=1;c<=fc;c++){
163 printf("%c",ft[c]);
164 }
165 printf("\n");
166 for(c=0;c<100;c++){
167 ng[c]=op[c]=0;
168 }
169 int p,q,r,ans;
170 ans=0;
171 for(p=0;p<3;p++){
172 for(q=0;q<3;q++){
173 for(r=0;r<3;r++){
174 if(F(p,q,r,ft,fc)==2){
175 ans++;
176 }
177 }
178 }
179 }
180 printf("%d\n",ans);
181 }
182 return 0;
183 }
```
**Question**: Does line `42` have control dependence over line `50` in function `F`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 42
}
|
{
"line": 50
}
|
codenet_p00736_s631138606_F_3_85.yaml
|
codenet_p00736_s631138606_F_3_85.c
|
p00736
|
s631138606
|
F
| 3
| 85
|
codenet
|
C
| 41
| 50
| true
|
control_codenet_p00736_s631138606_F_3_85_fit_50_2
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include<stdio.h>
2 #include<string.h>
3 int F(int p,int q,int r,char ft[100],int fc){
4 int fit[100],ic,x,t;
5 ic=1;
6 for(t=0;t<100;t++){
7 fit[t]=0;
8 }
9 while(ic<fc){
10 if(ft[ic]=='P'){
11 fit[ic]=p;
12 }
13 if(ft[ic]=='Q'){
14 fit[ic]=q;
15 }
16 if(ft[ic]=='R'){
17 fit[ic]=r;
18 }
19 if(ft[ic]=='0'){
20 fit[ic]=0;
21 }
22 if(ft[ic]=='1'){
23 fit[ic]=1;
24 }
25 if(ft[ic]=='2'){
26 fit[ic]=2;
27 }
28 if(ft[ic]=='+'){
29 fit[ic]=3;
30 }
31 if(ft[ic]=='-'){
32 fit[ic]=4;
33 }
34 if(ft[ic]=='*'){
35 fit[ic]=5;
36 }
37 ic++;
38 }
39 ic--;
40 x=1;
41 while(x<ic){
42 if(fit[x]==3){
43 if(fit[x-1]==0&&fit[x-2]==0){
44 fit[x-2]=0;
45 }
46 else if(fit[x-1]==2||fit[x-2]==2){
47 fit[x-2]=2;
48 }
49 else{
50 fit[x-2]=1;
51 }
52 ic-=2;
53 for(t=x-1;t<=ic;t++){
54 fit[t]=fit[t+2];
55 }
56 x-=2;
57 }
58 if(fit[x]==4){
59 fit[x-1]=2-fit[x-1];
60 ic--;
61 for(t=x;t<=ic;t++){
62 fit[t]=fit[t+1];
63 }
64 x--;
65 }
66 if(fit[x]==5){
67 if(fit[x-1]==0||fit[x-2]==0){
68 fit[x-2]=0;
69 }
70 else if(fit[x-1]==2&&fit[x-2]==2){
71 fit[x-2]=2;
72 }
73 else{
74 fit[x-2]=1;
75 }
76 ic-=2;
77 for(t=x-1;t<=ic;t++){
78 fit[t]=fit[t+2];
79 }
80 x-=2;
81 }
82 x++;
83 }
84 return fit[1];
85 }
86 int main(void){
87 int c,nc,oc,fc;
88 char txt[100],ng[100],op[100],ft[100];
89 while(1){
90 scanf("%s",&txt);
91 if(txt[0]=='.'){
92 break;
93 }
94 nc=oc=fc=0;
95 for(c=0;c<strlen(txt);c++){
96 if(txt[c]==0||txt[c]==1||txt[c]==2||txt[c]=='P'||txt[c]=='Q'||txt[c]=='R'){
97 fc++;
98 ft[fc]=txt[c];
99 if(nc!=0){
100 while(nc!=0){
101 fc++;
102 ft[fc]=ng[nc];
103 nc--;
104 }
105 }
106 }
107 if(txt[c]=='+'){
108 if(oc==0||op[oc]=='('){
109 oc++;
110 op[oc]=txt[c];
111 }
112 else{
113 while(oc!=0){
114 fc++;
115 ft[fc]=op[oc];
116 oc--;
117 }
118 oc++;
119 op[oc]=txt[c];
120 }
121 }
122 if(txt[c]=='*'){
123 if(oc==0||op[oc]=='+'||op[oc]=='('){
124 oc++;
125 op[oc]=txt[c];
126 }
127 else{
128 while(oc!=0){
129 fc++;
130 ft[fc]=op[oc];
131 oc--;
132 }
133 oc++;
134 op[oc]=txt[c];
135 }
136 }
137 if(txt[c]=='('){
138 oc++;
139 op[oc]=txt[c];
140 }
141 if(txt[c]==')'){
142 while(op[oc]!='('){
143 fc++;
144 ft[fc]=op[oc];
145 oc--;
146 }
147 op[oc]=0;
148 oc--;
149 }
150 if(txt[c]=='-'){
151 nc++;
152 ng[nc]=txt[c];
153 }
154 }
155 if(oc!=0){
156 while(oc!=0){
157 fc++;
158 ft[fc]=op[oc];
159 oc--;
160 }
161 }
162 for(c=1;c<=fc;c++){
163 printf("%c",ft[c]);
164 }
165 printf("\n");
166 for(c=0;c<100;c++){
167 ng[c]=op[c]=0;
168 }
169 int p,q,r,ans;
170 ans=0;
171 for(p=0;p<3;p++){
172 for(q=0;q<3;q++){
173 for(r=0;r<3;r++){
174 if(F(p,q,r,ft,fc)==2){
175 ans++;
176 }
177 }
178 }
179 }
180 printf("%d\n",ans);
181 }
182 return 0;
183 }
```
**Question**: Does line `41` have control dependence over line `50` in function `F`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 41
}
|
{
"line": 50
}
|
codenet_p00736_s631138606_F_3_85.yaml
|
codenet_p00736_s631138606_F_3_85.c
|
p00736
|
s631138606
|
F
| 3
| 85
|
codenet
|
C
| 43
| 50
| true
|
control_codenet_p00736_s631138606_F_3_85_fit_50_3
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include<stdio.h>
2 #include<string.h>
3 int F(int p,int q,int r,char ft[100],int fc){
4 int fit[100],ic,x,t;
5 ic=1;
6 for(t=0;t<100;t++){
7 fit[t]=0;
8 }
9 while(ic<fc){
10 if(ft[ic]=='P'){
11 fit[ic]=p;
12 }
13 if(ft[ic]=='Q'){
14 fit[ic]=q;
15 }
16 if(ft[ic]=='R'){
17 fit[ic]=r;
18 }
19 if(ft[ic]=='0'){
20 fit[ic]=0;
21 }
22 if(ft[ic]=='1'){
23 fit[ic]=1;
24 }
25 if(ft[ic]=='2'){
26 fit[ic]=2;
27 }
28 if(ft[ic]=='+'){
29 fit[ic]=3;
30 }
31 if(ft[ic]=='-'){
32 fit[ic]=4;
33 }
34 if(ft[ic]=='*'){
35 fit[ic]=5;
36 }
37 ic++;
38 }
39 ic--;
40 x=1;
41 while(x<ic){
42 if(fit[x]==3){
43 if(fit[x-1]==0&&fit[x-2]==0){
44 fit[x-2]=0;
45 }
46 else if(fit[x-1]==2||fit[x-2]==2){
47 fit[x-2]=2;
48 }
49 else{
50 fit[x-2]=1;
51 }
52 ic-=2;
53 for(t=x-1;t<=ic;t++){
54 fit[t]=fit[t+2];
55 }
56 x-=2;
57 }
58 if(fit[x]==4){
59 fit[x-1]=2-fit[x-1];
60 ic--;
61 for(t=x;t<=ic;t++){
62 fit[t]=fit[t+1];
63 }
64 x--;
65 }
66 if(fit[x]==5){
67 if(fit[x-1]==0||fit[x-2]==0){
68 fit[x-2]=0;
69 }
70 else if(fit[x-1]==2&&fit[x-2]==2){
71 fit[x-2]=2;
72 }
73 else{
74 fit[x-2]=1;
75 }
76 ic-=2;
77 for(t=x-1;t<=ic;t++){
78 fit[t]=fit[t+2];
79 }
80 x-=2;
81 }
82 x++;
83 }
84 return fit[1];
85 }
86 int main(void){
87 int c,nc,oc,fc;
88 char txt[100],ng[100],op[100],ft[100];
89 while(1){
90 scanf("%s",&txt);
91 if(txt[0]=='.'){
92 break;
93 }
94 nc=oc=fc=0;
95 for(c=0;c<strlen(txt);c++){
96 if(txt[c]==0||txt[c]==1||txt[c]==2||txt[c]=='P'||txt[c]=='Q'||txt[c]=='R'){
97 fc++;
98 ft[fc]=txt[c];
99 if(nc!=0){
100 while(nc!=0){
101 fc++;
102 ft[fc]=ng[nc];
103 nc--;
104 }
105 }
106 }
107 if(txt[c]=='+'){
108 if(oc==0||op[oc]=='('){
109 oc++;
110 op[oc]=txt[c];
111 }
112 else{
113 while(oc!=0){
114 fc++;
115 ft[fc]=op[oc];
116 oc--;
117 }
118 oc++;
119 op[oc]=txt[c];
120 }
121 }
122 if(txt[c]=='*'){
123 if(oc==0||op[oc]=='+'||op[oc]=='('){
124 oc++;
125 op[oc]=txt[c];
126 }
127 else{
128 while(oc!=0){
129 fc++;
130 ft[fc]=op[oc];
131 oc--;
132 }
133 oc++;
134 op[oc]=txt[c];
135 }
136 }
137 if(txt[c]=='('){
138 oc++;
139 op[oc]=txt[c];
140 }
141 if(txt[c]==')'){
142 while(op[oc]!='('){
143 fc++;
144 ft[fc]=op[oc];
145 oc--;
146 }
147 op[oc]=0;
148 oc--;
149 }
150 if(txt[c]=='-'){
151 nc++;
152 ng[nc]=txt[c];
153 }
154 }
155 if(oc!=0){
156 while(oc!=0){
157 fc++;
158 ft[fc]=op[oc];
159 oc--;
160 }
161 }
162 for(c=1;c<=fc;c++){
163 printf("%c",ft[c]);
164 }
165 printf("\n");
166 for(c=0;c<100;c++){
167 ng[c]=op[c]=0;
168 }
169 int p,q,r,ans;
170 ans=0;
171 for(p=0;p<3;p++){
172 for(q=0;q<3;q++){
173 for(r=0;r<3;r++){
174 if(F(p,q,r,ft,fc)==2){
175 ans++;
176 }
177 }
178 }
179 }
180 printf("%d\n",ans);
181 }
182 return 0;
183 }
```
**Question**: Does line `43` have control dependence over line `50` in function `F`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 43
}
|
{
"line": 50
}
|
codenet_p00736_s631138606_F_3_85.yaml
|
codenet_p00736_s631138606_F_3_85.c
|
p00736
|
s631138606
|
F
| 3
| 85
|
codenet
|
C
| 46
| 50
| true
|
control_codenet_p00736_s631138606_F_3_85_fit_50_4
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include<stdio.h>
2 #include<string.h>
3 int F(int p,int q,int r,char ft[100],int fc){
4 int fit[100],ic,x,t;
5 ic=1;
6 for(t=0;t<100;t++){
7 fit[t]=0;
8 }
9 while(ic<fc){
10 if(ft[ic]=='P'){
11 fit[ic]=p;
12 }
13 if(ft[ic]=='Q'){
14 fit[ic]=q;
15 }
16 if(ft[ic]=='R'){
17 fit[ic]=r;
18 }
19 if(ft[ic]=='0'){
20 fit[ic]=0;
21 }
22 if(ft[ic]=='1'){
23 fit[ic]=1;
24 }
25 if(ft[ic]=='2'){
26 fit[ic]=2;
27 }
28 if(ft[ic]=='+'){
29 fit[ic]=3;
30 }
31 if(ft[ic]=='-'){
32 fit[ic]=4;
33 }
34 if(ft[ic]=='*'){
35 fit[ic]=5;
36 }
37 ic++;
38 }
39 ic--;
40 x=1;
41 while(x<ic){
42 if(fit[x]==3){
43 if(fit[x-1]==0&&fit[x-2]==0){
44 fit[x-2]=0;
45 }
46 else if(fit[x-1]==2||fit[x-2]==2){
47 fit[x-2]=2;
48 }
49 else{
50 fit[x-2]=1;
51 }
52 ic-=2;
53 for(t=x-1;t<=ic;t++){
54 fit[t]=fit[t+2];
55 }
56 x-=2;
57 }
58 if(fit[x]==4){
59 fit[x-1]=2-fit[x-1];
60 ic--;
61 for(t=x;t<=ic;t++){
62 fit[t]=fit[t+1];
63 }
64 x--;
65 }
66 if(fit[x]==5){
67 if(fit[x-1]==0||fit[x-2]==0){
68 fit[x-2]=0;
69 }
70 else if(fit[x-1]==2&&fit[x-2]==2){
71 fit[x-2]=2;
72 }
73 else{
74 fit[x-2]=1;
75 }
76 ic-=2;
77 for(t=x-1;t<=ic;t++){
78 fit[t]=fit[t+2];
79 }
80 x-=2;
81 }
82 x++;
83 }
84 return fit[1];
85 }
86 int main(void){
87 int c,nc,oc,fc;
88 char txt[100],ng[100],op[100],ft[100];
89 while(1){
90 scanf("%s",&txt);
91 if(txt[0]=='.'){
92 break;
93 }
94 nc=oc=fc=0;
95 for(c=0;c<strlen(txt);c++){
96 if(txt[c]==0||txt[c]==1||txt[c]==2||txt[c]=='P'||txt[c]=='Q'||txt[c]=='R'){
97 fc++;
98 ft[fc]=txt[c];
99 if(nc!=0){
100 while(nc!=0){
101 fc++;
102 ft[fc]=ng[nc];
103 nc--;
104 }
105 }
106 }
107 if(txt[c]=='+'){
108 if(oc==0||op[oc]=='('){
109 oc++;
110 op[oc]=txt[c];
111 }
112 else{
113 while(oc!=0){
114 fc++;
115 ft[fc]=op[oc];
116 oc--;
117 }
118 oc++;
119 op[oc]=txt[c];
120 }
121 }
122 if(txt[c]=='*'){
123 if(oc==0||op[oc]=='+'||op[oc]=='('){
124 oc++;
125 op[oc]=txt[c];
126 }
127 else{
128 while(oc!=0){
129 fc++;
130 ft[fc]=op[oc];
131 oc--;
132 }
133 oc++;
134 op[oc]=txt[c];
135 }
136 }
137 if(txt[c]=='('){
138 oc++;
139 op[oc]=txt[c];
140 }
141 if(txt[c]==')'){
142 while(op[oc]!='('){
143 fc++;
144 ft[fc]=op[oc];
145 oc--;
146 }
147 op[oc]=0;
148 oc--;
149 }
150 if(txt[c]=='-'){
151 nc++;
152 ng[nc]=txt[c];
153 }
154 }
155 if(oc!=0){
156 while(oc!=0){
157 fc++;
158 ft[fc]=op[oc];
159 oc--;
160 }
161 }
162 for(c=1;c<=fc;c++){
163 printf("%c",ft[c]);
164 }
165 printf("\n");
166 for(c=0;c<100;c++){
167 ng[c]=op[c]=0;
168 }
169 int p,q,r,ans;
170 ans=0;
171 for(p=0;p<3;p++){
172 for(q=0;q<3;q++){
173 for(r=0;r<3;r++){
174 if(F(p,q,r,ft,fc)==2){
175 ans++;
176 }
177 }
178 }
179 }
180 printf("%d\n",ans);
181 }
182 return 0;
183 }
```
**Question**: Does line `46` have control dependence over line `50` in function `F`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 46
}
|
{
"line": 50
}
|
codenet_p00736_s631138606_F_3_85.yaml
|
codenet_p00736_s631138606_F_3_85.c
|
p00736
|
s631138606
|
F
| 3
| 85
|
codenet
|
C
| 34
| 50
| false
|
control_codenet_p00736_s631138606_F_3_85_fit_50_5
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include<stdio.h>
2 #include<string.h>
3 int F(int p,int q,int r,char ft[100],int fc){
4 int fit[100],ic,x,t;
5 ic=1;
6 for(t=0;t<100;t++){
7 fit[t]=0;
8 }
9 while(ic<fc){
10 if(ft[ic]=='P'){
11 fit[ic]=p;
12 }
13 if(ft[ic]=='Q'){
14 fit[ic]=q;
15 }
16 if(ft[ic]=='R'){
17 fit[ic]=r;
18 }
19 if(ft[ic]=='0'){
20 fit[ic]=0;
21 }
22 if(ft[ic]=='1'){
23 fit[ic]=1;
24 }
25 if(ft[ic]=='2'){
26 fit[ic]=2;
27 }
28 if(ft[ic]=='+'){
29 fit[ic]=3;
30 }
31 if(ft[ic]=='-'){
32 fit[ic]=4;
33 }
34 if(ft[ic]=='*'){
35 fit[ic]=5;
36 }
37 ic++;
38 }
39 ic--;
40 x=1;
41 while(x<ic){
42 if(fit[x]==3){
43 if(fit[x-1]==0&&fit[x-2]==0){
44 fit[x-2]=0;
45 }
46 else if(fit[x-1]==2||fit[x-2]==2){
47 fit[x-2]=2;
48 }
49 else{
50 fit[x-2]=1;
51 }
52 ic-=2;
53 for(t=x-1;t<=ic;t++){
54 fit[t]=fit[t+2];
55 }
56 x-=2;
57 }
58 if(fit[x]==4){
59 fit[x-1]=2-fit[x-1];
60 ic--;
61 for(t=x;t<=ic;t++){
62 fit[t]=fit[t+1];
63 }
64 x--;
65 }
66 if(fit[x]==5){
67 if(fit[x-1]==0||fit[x-2]==0){
68 fit[x-2]=0;
69 }
70 else if(fit[x-1]==2&&fit[x-2]==2){
71 fit[x-2]=2;
72 }
73 else{
74 fit[x-2]=1;
75 }
76 ic-=2;
77 for(t=x-1;t<=ic;t++){
78 fit[t]=fit[t+2];
79 }
80 x-=2;
81 }
82 x++;
83 }
84 return fit[1];
85 }
86 int main(void){
87 int c,nc,oc,fc;
88 char txt[100],ng[100],op[100],ft[100];
89 while(1){
90 scanf("%s",&txt);
91 if(txt[0]=='.'){
92 break;
93 }
94 nc=oc=fc=0;
95 for(c=0;c<strlen(txt);c++){
96 if(txt[c]==0||txt[c]==1||txt[c]==2||txt[c]=='P'||txt[c]=='Q'||txt[c]=='R'){
97 fc++;
98 ft[fc]=txt[c];
99 if(nc!=0){
100 while(nc!=0){
101 fc++;
102 ft[fc]=ng[nc];
103 nc--;
104 }
105 }
106 }
107 if(txt[c]=='+'){
108 if(oc==0||op[oc]=='('){
109 oc++;
110 op[oc]=txt[c];
111 }
112 else{
113 while(oc!=0){
114 fc++;
115 ft[fc]=op[oc];
116 oc--;
117 }
118 oc++;
119 op[oc]=txt[c];
120 }
121 }
122 if(txt[c]=='*'){
123 if(oc==0||op[oc]=='+'||op[oc]=='('){
124 oc++;
125 op[oc]=txt[c];
126 }
127 else{
128 while(oc!=0){
129 fc++;
130 ft[fc]=op[oc];
131 oc--;
132 }
133 oc++;
134 op[oc]=txt[c];
135 }
136 }
137 if(txt[c]=='('){
138 oc++;
139 op[oc]=txt[c];
140 }
141 if(txt[c]==')'){
142 while(op[oc]!='('){
143 fc++;
144 ft[fc]=op[oc];
145 oc--;
146 }
147 op[oc]=0;
148 oc--;
149 }
150 if(txt[c]=='-'){
151 nc++;
152 ng[nc]=txt[c];
153 }
154 }
155 if(oc!=0){
156 while(oc!=0){
157 fc++;
158 ft[fc]=op[oc];
159 oc--;
160 }
161 }
162 for(c=1;c<=fc;c++){
163 printf("%c",ft[c]);
164 }
165 printf("\n");
166 for(c=0;c<100;c++){
167 ng[c]=op[c]=0;
168 }
169 int p,q,r,ans;
170 ans=0;
171 for(p=0;p<3;p++){
172 for(q=0;q<3;q++){
173 for(r=0;r<3;r++){
174 if(F(p,q,r,ft,fc)==2){
175 ans++;
176 }
177 }
178 }
179 }
180 printf("%d\n",ans);
181 }
182 return 0;
183 }
```
**Question**: Does line `34` have control dependence over line `50` in function `F`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 34
}
|
{
"line": 50
}
|
codenet_p00736_s631138606_F_3_85.yaml
|
codenet_p00736_s631138606_F_3_85.c
|
p00736
|
s631138606
|
F
| 3
| 85
|
codenet
|
C
| 28
| 50
| false
|
control_codenet_p00736_s631138606_F_3_85_fit_50_6
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include<stdio.h>
2 #include<string.h>
3 int F(int p,int q,int r,char ft[100],int fc){
4 int fit[100],ic,x,t;
5 ic=1;
6 for(t=0;t<100;t++){
7 fit[t]=0;
8 }
9 while(ic<fc){
10 if(ft[ic]=='P'){
11 fit[ic]=p;
12 }
13 if(ft[ic]=='Q'){
14 fit[ic]=q;
15 }
16 if(ft[ic]=='R'){
17 fit[ic]=r;
18 }
19 if(ft[ic]=='0'){
20 fit[ic]=0;
21 }
22 if(ft[ic]=='1'){
23 fit[ic]=1;
24 }
25 if(ft[ic]=='2'){
26 fit[ic]=2;
27 }
28 if(ft[ic]=='+'){
29 fit[ic]=3;
30 }
31 if(ft[ic]=='-'){
32 fit[ic]=4;
33 }
34 if(ft[ic]=='*'){
35 fit[ic]=5;
36 }
37 ic++;
38 }
39 ic--;
40 x=1;
41 while(x<ic){
42 if(fit[x]==3){
43 if(fit[x-1]==0&&fit[x-2]==0){
44 fit[x-2]=0;
45 }
46 else if(fit[x-1]==2||fit[x-2]==2){
47 fit[x-2]=2;
48 }
49 else{
50 fit[x-2]=1;
51 }
52 ic-=2;
53 for(t=x-1;t<=ic;t++){
54 fit[t]=fit[t+2];
55 }
56 x-=2;
57 }
58 if(fit[x]==4){
59 fit[x-1]=2-fit[x-1];
60 ic--;
61 for(t=x;t<=ic;t++){
62 fit[t]=fit[t+1];
63 }
64 x--;
65 }
66 if(fit[x]==5){
67 if(fit[x-1]==0||fit[x-2]==0){
68 fit[x-2]=0;
69 }
70 else if(fit[x-1]==2&&fit[x-2]==2){
71 fit[x-2]=2;
72 }
73 else{
74 fit[x-2]=1;
75 }
76 ic-=2;
77 for(t=x-1;t<=ic;t++){
78 fit[t]=fit[t+2];
79 }
80 x-=2;
81 }
82 x++;
83 }
84 return fit[1];
85 }
86 int main(void){
87 int c,nc,oc,fc;
88 char txt[100],ng[100],op[100],ft[100];
89 while(1){
90 scanf("%s",&txt);
91 if(txt[0]=='.'){
92 break;
93 }
94 nc=oc=fc=0;
95 for(c=0;c<strlen(txt);c++){
96 if(txt[c]==0||txt[c]==1||txt[c]==2||txt[c]=='P'||txt[c]=='Q'||txt[c]=='R'){
97 fc++;
98 ft[fc]=txt[c];
99 if(nc!=0){
100 while(nc!=0){
101 fc++;
102 ft[fc]=ng[nc];
103 nc--;
104 }
105 }
106 }
107 if(txt[c]=='+'){
108 if(oc==0||op[oc]=='('){
109 oc++;
110 op[oc]=txt[c];
111 }
112 else{
113 while(oc!=0){
114 fc++;
115 ft[fc]=op[oc];
116 oc--;
117 }
118 oc++;
119 op[oc]=txt[c];
120 }
121 }
122 if(txt[c]=='*'){
123 if(oc==0||op[oc]=='+'||op[oc]=='('){
124 oc++;
125 op[oc]=txt[c];
126 }
127 else{
128 while(oc!=0){
129 fc++;
130 ft[fc]=op[oc];
131 oc--;
132 }
133 oc++;
134 op[oc]=txt[c];
135 }
136 }
137 if(txt[c]=='('){
138 oc++;
139 op[oc]=txt[c];
140 }
141 if(txt[c]==')'){
142 while(op[oc]!='('){
143 fc++;
144 ft[fc]=op[oc];
145 oc--;
146 }
147 op[oc]=0;
148 oc--;
149 }
150 if(txt[c]=='-'){
151 nc++;
152 ng[nc]=txt[c];
153 }
154 }
155 if(oc!=0){
156 while(oc!=0){
157 fc++;
158 ft[fc]=op[oc];
159 oc--;
160 }
161 }
162 for(c=1;c<=fc;c++){
163 printf("%c",ft[c]);
164 }
165 printf("\n");
166 for(c=0;c<100;c++){
167 ng[c]=op[c]=0;
168 }
169 int p,q,r,ans;
170 ans=0;
171 for(p=0;p<3;p++){
172 for(q=0;q<3;q++){
173 for(r=0;r<3;r++){
174 if(F(p,q,r,ft,fc)==2){
175 ans++;
176 }
177 }
178 }
179 }
180 printf("%d\n",ans);
181 }
182 return 0;
183 }
```
**Question**: Does line `28` have control dependence over line `50` in function `F`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 28
}
|
{
"line": 50
}
|
codenet_p00736_s631138606_F_3_85.yaml
|
codenet_p00736_s631138606_F_3_85.c
|
p00736
|
s631138606
|
F
| 3
| 85
|
codenet
|
C
| 9
| 50
| false
|
control_codenet_p00736_s631138606_F_3_85_fit_50_7
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include<stdio.h>
2 #include<string.h>
3 int F(int p,int q,int r,char ft[100],int fc){
4 int fit[100],ic,x,t;
5 ic=1;
6 for(t=0;t<100;t++){
7 fit[t]=0;
8 }
9 while(ic<fc){
10 if(ft[ic]=='P'){
11 fit[ic]=p;
12 }
13 if(ft[ic]=='Q'){
14 fit[ic]=q;
15 }
16 if(ft[ic]=='R'){
17 fit[ic]=r;
18 }
19 if(ft[ic]=='0'){
20 fit[ic]=0;
21 }
22 if(ft[ic]=='1'){
23 fit[ic]=1;
24 }
25 if(ft[ic]=='2'){
26 fit[ic]=2;
27 }
28 if(ft[ic]=='+'){
29 fit[ic]=3;
30 }
31 if(ft[ic]=='-'){
32 fit[ic]=4;
33 }
34 if(ft[ic]=='*'){
35 fit[ic]=5;
36 }
37 ic++;
38 }
39 ic--;
40 x=1;
41 while(x<ic){
42 if(fit[x]==3){
43 if(fit[x-1]==0&&fit[x-2]==0){
44 fit[x-2]=0;
45 }
46 else if(fit[x-1]==2||fit[x-2]==2){
47 fit[x-2]=2;
48 }
49 else{
50 fit[x-2]=1;
51 }
52 ic-=2;
53 for(t=x-1;t<=ic;t++){
54 fit[t]=fit[t+2];
55 }
56 x-=2;
57 }
58 if(fit[x]==4){
59 fit[x-1]=2-fit[x-1];
60 ic--;
61 for(t=x;t<=ic;t++){
62 fit[t]=fit[t+1];
63 }
64 x--;
65 }
66 if(fit[x]==5){
67 if(fit[x-1]==0||fit[x-2]==0){
68 fit[x-2]=0;
69 }
70 else if(fit[x-1]==2&&fit[x-2]==2){
71 fit[x-2]=2;
72 }
73 else{
74 fit[x-2]=1;
75 }
76 ic-=2;
77 for(t=x-1;t<=ic;t++){
78 fit[t]=fit[t+2];
79 }
80 x-=2;
81 }
82 x++;
83 }
84 return fit[1];
85 }
86 int main(void){
87 int c,nc,oc,fc;
88 char txt[100],ng[100],op[100],ft[100];
89 while(1){
90 scanf("%s",&txt);
91 if(txt[0]=='.'){
92 break;
93 }
94 nc=oc=fc=0;
95 for(c=0;c<strlen(txt);c++){
96 if(txt[c]==0||txt[c]==1||txt[c]==2||txt[c]=='P'||txt[c]=='Q'||txt[c]=='R'){
97 fc++;
98 ft[fc]=txt[c];
99 if(nc!=0){
100 while(nc!=0){
101 fc++;
102 ft[fc]=ng[nc];
103 nc--;
104 }
105 }
106 }
107 if(txt[c]=='+'){
108 if(oc==0||op[oc]=='('){
109 oc++;
110 op[oc]=txt[c];
111 }
112 else{
113 while(oc!=0){
114 fc++;
115 ft[fc]=op[oc];
116 oc--;
117 }
118 oc++;
119 op[oc]=txt[c];
120 }
121 }
122 if(txt[c]=='*'){
123 if(oc==0||op[oc]=='+'||op[oc]=='('){
124 oc++;
125 op[oc]=txt[c];
126 }
127 else{
128 while(oc!=0){
129 fc++;
130 ft[fc]=op[oc];
131 oc--;
132 }
133 oc++;
134 op[oc]=txt[c];
135 }
136 }
137 if(txt[c]=='('){
138 oc++;
139 op[oc]=txt[c];
140 }
141 if(txt[c]==')'){
142 while(op[oc]!='('){
143 fc++;
144 ft[fc]=op[oc];
145 oc--;
146 }
147 op[oc]=0;
148 oc--;
149 }
150 if(txt[c]=='-'){
151 nc++;
152 ng[nc]=txt[c];
153 }
154 }
155 if(oc!=0){
156 while(oc!=0){
157 fc++;
158 ft[fc]=op[oc];
159 oc--;
160 }
161 }
162 for(c=1;c<=fc;c++){
163 printf("%c",ft[c]);
164 }
165 printf("\n");
166 for(c=0;c<100;c++){
167 ng[c]=op[c]=0;
168 }
169 int p,q,r,ans;
170 ans=0;
171 for(p=0;p<3;p++){
172 for(q=0;q<3;q++){
173 for(r=0;r<3;r++){
174 if(F(p,q,r,ft,fc)==2){
175 ans++;
176 }
177 }
178 }
179 }
180 printf("%d\n",ans);
181 }
182 return 0;
183 }
```
**Question**: Does line `9` have control dependence over line `50` in function `F`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 9
}
|
{
"line": 50
}
|
codenet_p00736_s631138606_F_3_85.yaml
|
codenet_p00736_s631138606_F_3_85.c
|
p00736
|
s631138606
|
F
| 3
| 85
|
codenet
|
C
| 19
| 50
| false
|
control_codenet_p00736_s631138606_F_3_85_fit_50_8
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include<stdio.h>
2 #include<string.h>
3 int F(int p,int q,int r,char ft[100],int fc){
4 int fit[100],ic,x,t;
5 ic=1;
6 for(t=0;t<100;t++){
7 fit[t]=0;
8 }
9 while(ic<fc){
10 if(ft[ic]=='P'){
11 fit[ic]=p;
12 }
13 if(ft[ic]=='Q'){
14 fit[ic]=q;
15 }
16 if(ft[ic]=='R'){
17 fit[ic]=r;
18 }
19 if(ft[ic]=='0'){
20 fit[ic]=0;
21 }
22 if(ft[ic]=='1'){
23 fit[ic]=1;
24 }
25 if(ft[ic]=='2'){
26 fit[ic]=2;
27 }
28 if(ft[ic]=='+'){
29 fit[ic]=3;
30 }
31 if(ft[ic]=='-'){
32 fit[ic]=4;
33 }
34 if(ft[ic]=='*'){
35 fit[ic]=5;
36 }
37 ic++;
38 }
39 ic--;
40 x=1;
41 while(x<ic){
42 if(fit[x]==3){
43 if(fit[x-1]==0&&fit[x-2]==0){
44 fit[x-2]=0;
45 }
46 else if(fit[x-1]==2||fit[x-2]==2){
47 fit[x-2]=2;
48 }
49 else{
50 fit[x-2]=1;
51 }
52 ic-=2;
53 for(t=x-1;t<=ic;t++){
54 fit[t]=fit[t+2];
55 }
56 x-=2;
57 }
58 if(fit[x]==4){
59 fit[x-1]=2-fit[x-1];
60 ic--;
61 for(t=x;t<=ic;t++){
62 fit[t]=fit[t+1];
63 }
64 x--;
65 }
66 if(fit[x]==5){
67 if(fit[x-1]==0||fit[x-2]==0){
68 fit[x-2]=0;
69 }
70 else if(fit[x-1]==2&&fit[x-2]==2){
71 fit[x-2]=2;
72 }
73 else{
74 fit[x-2]=1;
75 }
76 ic-=2;
77 for(t=x-1;t<=ic;t++){
78 fit[t]=fit[t+2];
79 }
80 x-=2;
81 }
82 x++;
83 }
84 return fit[1];
85 }
86 int main(void){
87 int c,nc,oc,fc;
88 char txt[100],ng[100],op[100],ft[100];
89 while(1){
90 scanf("%s",&txt);
91 if(txt[0]=='.'){
92 break;
93 }
94 nc=oc=fc=0;
95 for(c=0;c<strlen(txt);c++){
96 if(txt[c]==0||txt[c]==1||txt[c]==2||txt[c]=='P'||txt[c]=='Q'||txt[c]=='R'){
97 fc++;
98 ft[fc]=txt[c];
99 if(nc!=0){
100 while(nc!=0){
101 fc++;
102 ft[fc]=ng[nc];
103 nc--;
104 }
105 }
106 }
107 if(txt[c]=='+'){
108 if(oc==0||op[oc]=='('){
109 oc++;
110 op[oc]=txt[c];
111 }
112 else{
113 while(oc!=0){
114 fc++;
115 ft[fc]=op[oc];
116 oc--;
117 }
118 oc++;
119 op[oc]=txt[c];
120 }
121 }
122 if(txt[c]=='*'){
123 if(oc==0||op[oc]=='+'||op[oc]=='('){
124 oc++;
125 op[oc]=txt[c];
126 }
127 else{
128 while(oc!=0){
129 fc++;
130 ft[fc]=op[oc];
131 oc--;
132 }
133 oc++;
134 op[oc]=txt[c];
135 }
136 }
137 if(txt[c]=='('){
138 oc++;
139 op[oc]=txt[c];
140 }
141 if(txt[c]==')'){
142 while(op[oc]!='('){
143 fc++;
144 ft[fc]=op[oc];
145 oc--;
146 }
147 op[oc]=0;
148 oc--;
149 }
150 if(txt[c]=='-'){
151 nc++;
152 ng[nc]=txt[c];
153 }
154 }
155 if(oc!=0){
156 while(oc!=0){
157 fc++;
158 ft[fc]=op[oc];
159 oc--;
160 }
161 }
162 for(c=1;c<=fc;c++){
163 printf("%c",ft[c]);
164 }
165 printf("\n");
166 for(c=0;c<100;c++){
167 ng[c]=op[c]=0;
168 }
169 int p,q,r,ans;
170 ans=0;
171 for(p=0;p<3;p++){
172 for(q=0;q<3;q++){
173 for(r=0;r<3;r++){
174 if(F(p,q,r,ft,fc)==2){
175 ans++;
176 }
177 }
178 }
179 }
180 printf("%d\n",ans);
181 }
182 return 0;
183 }
```
**Question**: Does line `19` have control dependence over line `50` in function `F`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 19
}
|
{
"line": 50
}
|
codenet_p00736_s631138606_F_3_85.yaml
|
codenet_p00736_s631138606_F_3_85.c
|
p00736
|
s631138606
|
F
| 3
| 85
|
codenet
|
C
| 6
| 50
| false
|
control_codenet_p00736_s631138606_F_3_85_fit_50_9
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include<stdio.h>
2 #include<string.h>
3 int F(int p,int q,int r,char ft[100],int fc){
4 int fit[100],ic,x,t;
5 ic=1;
6 for(t=0;t<100;t++){
7 fit[t]=0;
8 }
9 while(ic<fc){
10 if(ft[ic]=='P'){
11 fit[ic]=p;
12 }
13 if(ft[ic]=='Q'){
14 fit[ic]=q;
15 }
16 if(ft[ic]=='R'){
17 fit[ic]=r;
18 }
19 if(ft[ic]=='0'){
20 fit[ic]=0;
21 }
22 if(ft[ic]=='1'){
23 fit[ic]=1;
24 }
25 if(ft[ic]=='2'){
26 fit[ic]=2;
27 }
28 if(ft[ic]=='+'){
29 fit[ic]=3;
30 }
31 if(ft[ic]=='-'){
32 fit[ic]=4;
33 }
34 if(ft[ic]=='*'){
35 fit[ic]=5;
36 }
37 ic++;
38 }
39 ic--;
40 x=1;
41 while(x<ic){
42 if(fit[x]==3){
43 if(fit[x-1]==0&&fit[x-2]==0){
44 fit[x-2]=0;
45 }
46 else if(fit[x-1]==2||fit[x-2]==2){
47 fit[x-2]=2;
48 }
49 else{
50 fit[x-2]=1;
51 }
52 ic-=2;
53 for(t=x-1;t<=ic;t++){
54 fit[t]=fit[t+2];
55 }
56 x-=2;
57 }
58 if(fit[x]==4){
59 fit[x-1]=2-fit[x-1];
60 ic--;
61 for(t=x;t<=ic;t++){
62 fit[t]=fit[t+1];
63 }
64 x--;
65 }
66 if(fit[x]==5){
67 if(fit[x-1]==0||fit[x-2]==0){
68 fit[x-2]=0;
69 }
70 else if(fit[x-1]==2&&fit[x-2]==2){
71 fit[x-2]=2;
72 }
73 else{
74 fit[x-2]=1;
75 }
76 ic-=2;
77 for(t=x-1;t<=ic;t++){
78 fit[t]=fit[t+2];
79 }
80 x-=2;
81 }
82 x++;
83 }
84 return fit[1];
85 }
86 int main(void){
87 int c,nc,oc,fc;
88 char txt[100],ng[100],op[100],ft[100];
89 while(1){
90 scanf("%s",&txt);
91 if(txt[0]=='.'){
92 break;
93 }
94 nc=oc=fc=0;
95 for(c=0;c<strlen(txt);c++){
96 if(txt[c]==0||txt[c]==1||txt[c]==2||txt[c]=='P'||txt[c]=='Q'||txt[c]=='R'){
97 fc++;
98 ft[fc]=txt[c];
99 if(nc!=0){
100 while(nc!=0){
101 fc++;
102 ft[fc]=ng[nc];
103 nc--;
104 }
105 }
106 }
107 if(txt[c]=='+'){
108 if(oc==0||op[oc]=='('){
109 oc++;
110 op[oc]=txt[c];
111 }
112 else{
113 while(oc!=0){
114 fc++;
115 ft[fc]=op[oc];
116 oc--;
117 }
118 oc++;
119 op[oc]=txt[c];
120 }
121 }
122 if(txt[c]=='*'){
123 if(oc==0||op[oc]=='+'||op[oc]=='('){
124 oc++;
125 op[oc]=txt[c];
126 }
127 else{
128 while(oc!=0){
129 fc++;
130 ft[fc]=op[oc];
131 oc--;
132 }
133 oc++;
134 op[oc]=txt[c];
135 }
136 }
137 if(txt[c]=='('){
138 oc++;
139 op[oc]=txt[c];
140 }
141 if(txt[c]==')'){
142 while(op[oc]!='('){
143 fc++;
144 ft[fc]=op[oc];
145 oc--;
146 }
147 op[oc]=0;
148 oc--;
149 }
150 if(txt[c]=='-'){
151 nc++;
152 ng[nc]=txt[c];
153 }
154 }
155 if(oc!=0){
156 while(oc!=0){
157 fc++;
158 ft[fc]=op[oc];
159 oc--;
160 }
161 }
162 for(c=1;c<=fc;c++){
163 printf("%c",ft[c]);
164 }
165 printf("\n");
166 for(c=0;c<100;c++){
167 ng[c]=op[c]=0;
168 }
169 int p,q,r,ans;
170 ans=0;
171 for(p=0;p<3;p++){
172 for(q=0;q<3;q++){
173 for(r=0;r<3;r++){
174 if(F(p,q,r,ft,fc)==2){
175 ans++;
176 }
177 }
178 }
179 }
180 printf("%d\n",ans);
181 }
182 return 0;
183 }
```
**Question**: Does line `6` have control dependence over line `50` in function `F`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 6
}
|
{
"line": 50
}
|
codenet_p00736_s631138606_F_3_85.yaml
|
codenet_p00736_s631138606_F_3_85.c
|
p00736
|
s631138606
|
F
| 3
| 85
|
codenet
|
C
| 77
| 78
| true
|
control_codenet_p00736_s631138606_F_3_85_fit_78_1
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include<stdio.h>
2 #include<string.h>
3 int F(int p,int q,int r,char ft[100],int fc){
4 int fit[100],ic,x,t;
5 ic=1;
6 for(t=0;t<100;t++){
7 fit[t]=0;
8 }
9 while(ic<fc){
10 if(ft[ic]=='P'){
11 fit[ic]=p;
12 }
13 if(ft[ic]=='Q'){
14 fit[ic]=q;
15 }
16 if(ft[ic]=='R'){
17 fit[ic]=r;
18 }
19 if(ft[ic]=='0'){
20 fit[ic]=0;
21 }
22 if(ft[ic]=='1'){
23 fit[ic]=1;
24 }
25 if(ft[ic]=='2'){
26 fit[ic]=2;
27 }
28 if(ft[ic]=='+'){
29 fit[ic]=3;
30 }
31 if(ft[ic]=='-'){
32 fit[ic]=4;
33 }
34 if(ft[ic]=='*'){
35 fit[ic]=5;
36 }
37 ic++;
38 }
39 ic--;
40 x=1;
41 while(x<ic){
42 if(fit[x]==3){
43 if(fit[x-1]==0&&fit[x-2]==0){
44 fit[x-2]=0;
45 }
46 else if(fit[x-1]==2||fit[x-2]==2){
47 fit[x-2]=2;
48 }
49 else{
50 fit[x-2]=1;
51 }
52 ic-=2;
53 for(t=x-1;t<=ic;t++){
54 fit[t]=fit[t+2];
55 }
56 x-=2;
57 }
58 if(fit[x]==4){
59 fit[x-1]=2-fit[x-1];
60 ic--;
61 for(t=x;t<=ic;t++){
62 fit[t]=fit[t+1];
63 }
64 x--;
65 }
66 if(fit[x]==5){
67 if(fit[x-1]==0||fit[x-2]==0){
68 fit[x-2]=0;
69 }
70 else if(fit[x-1]==2&&fit[x-2]==2){
71 fit[x-2]=2;
72 }
73 else{
74 fit[x-2]=1;
75 }
76 ic-=2;
77 for(t=x-1;t<=ic;t++){
78 fit[t]=fit[t+2];
79 }
80 x-=2;
81 }
82 x++;
83 }
84 return fit[1];
85 }
86 int main(void){
87 int c,nc,oc,fc;
88 char txt[100],ng[100],op[100],ft[100];
89 while(1){
90 scanf("%s",&txt);
91 if(txt[0]=='.'){
92 break;
93 }
94 nc=oc=fc=0;
95 for(c=0;c<strlen(txt);c++){
96 if(txt[c]==0||txt[c]==1||txt[c]==2||txt[c]=='P'||txt[c]=='Q'||txt[c]=='R'){
97 fc++;
98 ft[fc]=txt[c];
99 if(nc!=0){
100 while(nc!=0){
101 fc++;
102 ft[fc]=ng[nc];
103 nc--;
104 }
105 }
106 }
107 if(txt[c]=='+'){
108 if(oc==0||op[oc]=='('){
109 oc++;
110 op[oc]=txt[c];
111 }
112 else{
113 while(oc!=0){
114 fc++;
115 ft[fc]=op[oc];
116 oc--;
117 }
118 oc++;
119 op[oc]=txt[c];
120 }
121 }
122 if(txt[c]=='*'){
123 if(oc==0||op[oc]=='+'||op[oc]=='('){
124 oc++;
125 op[oc]=txt[c];
126 }
127 else{
128 while(oc!=0){
129 fc++;
130 ft[fc]=op[oc];
131 oc--;
132 }
133 oc++;
134 op[oc]=txt[c];
135 }
136 }
137 if(txt[c]=='('){
138 oc++;
139 op[oc]=txt[c];
140 }
141 if(txt[c]==')'){
142 while(op[oc]!='('){
143 fc++;
144 ft[fc]=op[oc];
145 oc--;
146 }
147 op[oc]=0;
148 oc--;
149 }
150 if(txt[c]=='-'){
151 nc++;
152 ng[nc]=txt[c];
153 }
154 }
155 if(oc!=0){
156 while(oc!=0){
157 fc++;
158 ft[fc]=op[oc];
159 oc--;
160 }
161 }
162 for(c=1;c<=fc;c++){
163 printf("%c",ft[c]);
164 }
165 printf("\n");
166 for(c=0;c<100;c++){
167 ng[c]=op[c]=0;
168 }
169 int p,q,r,ans;
170 ans=0;
171 for(p=0;p<3;p++){
172 for(q=0;q<3;q++){
173 for(r=0;r<3;r++){
174 if(F(p,q,r,ft,fc)==2){
175 ans++;
176 }
177 }
178 }
179 }
180 printf("%d\n",ans);
181 }
182 return 0;
183 }
```
**Question**: Does line `77` have control dependence over line `78` in function `F`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 77
}
|
{
"line": 78
}
|
codenet_p00736_s631138606_F_3_85.yaml
|
codenet_p00736_s631138606_F_3_85.c
|
p00736
|
s631138606
|
F
| 3
| 85
|
codenet
|
C
| 66
| 78
| true
|
control_codenet_p00736_s631138606_F_3_85_fit_78_2
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include<stdio.h>
2 #include<string.h>
3 int F(int p,int q,int r,char ft[100],int fc){
4 int fit[100],ic,x,t;
5 ic=1;
6 for(t=0;t<100;t++){
7 fit[t]=0;
8 }
9 while(ic<fc){
10 if(ft[ic]=='P'){
11 fit[ic]=p;
12 }
13 if(ft[ic]=='Q'){
14 fit[ic]=q;
15 }
16 if(ft[ic]=='R'){
17 fit[ic]=r;
18 }
19 if(ft[ic]=='0'){
20 fit[ic]=0;
21 }
22 if(ft[ic]=='1'){
23 fit[ic]=1;
24 }
25 if(ft[ic]=='2'){
26 fit[ic]=2;
27 }
28 if(ft[ic]=='+'){
29 fit[ic]=3;
30 }
31 if(ft[ic]=='-'){
32 fit[ic]=4;
33 }
34 if(ft[ic]=='*'){
35 fit[ic]=5;
36 }
37 ic++;
38 }
39 ic--;
40 x=1;
41 while(x<ic){
42 if(fit[x]==3){
43 if(fit[x-1]==0&&fit[x-2]==0){
44 fit[x-2]=0;
45 }
46 else if(fit[x-1]==2||fit[x-2]==2){
47 fit[x-2]=2;
48 }
49 else{
50 fit[x-2]=1;
51 }
52 ic-=2;
53 for(t=x-1;t<=ic;t++){
54 fit[t]=fit[t+2];
55 }
56 x-=2;
57 }
58 if(fit[x]==4){
59 fit[x-1]=2-fit[x-1];
60 ic--;
61 for(t=x;t<=ic;t++){
62 fit[t]=fit[t+1];
63 }
64 x--;
65 }
66 if(fit[x]==5){
67 if(fit[x-1]==0||fit[x-2]==0){
68 fit[x-2]=0;
69 }
70 else if(fit[x-1]==2&&fit[x-2]==2){
71 fit[x-2]=2;
72 }
73 else{
74 fit[x-2]=1;
75 }
76 ic-=2;
77 for(t=x-1;t<=ic;t++){
78 fit[t]=fit[t+2];
79 }
80 x-=2;
81 }
82 x++;
83 }
84 return fit[1];
85 }
86 int main(void){
87 int c,nc,oc,fc;
88 char txt[100],ng[100],op[100],ft[100];
89 while(1){
90 scanf("%s",&txt);
91 if(txt[0]=='.'){
92 break;
93 }
94 nc=oc=fc=0;
95 for(c=0;c<strlen(txt);c++){
96 if(txt[c]==0||txt[c]==1||txt[c]==2||txt[c]=='P'||txt[c]=='Q'||txt[c]=='R'){
97 fc++;
98 ft[fc]=txt[c];
99 if(nc!=0){
100 while(nc!=0){
101 fc++;
102 ft[fc]=ng[nc];
103 nc--;
104 }
105 }
106 }
107 if(txt[c]=='+'){
108 if(oc==0||op[oc]=='('){
109 oc++;
110 op[oc]=txt[c];
111 }
112 else{
113 while(oc!=0){
114 fc++;
115 ft[fc]=op[oc];
116 oc--;
117 }
118 oc++;
119 op[oc]=txt[c];
120 }
121 }
122 if(txt[c]=='*'){
123 if(oc==0||op[oc]=='+'||op[oc]=='('){
124 oc++;
125 op[oc]=txt[c];
126 }
127 else{
128 while(oc!=0){
129 fc++;
130 ft[fc]=op[oc];
131 oc--;
132 }
133 oc++;
134 op[oc]=txt[c];
135 }
136 }
137 if(txt[c]=='('){
138 oc++;
139 op[oc]=txt[c];
140 }
141 if(txt[c]==')'){
142 while(op[oc]!='('){
143 fc++;
144 ft[fc]=op[oc];
145 oc--;
146 }
147 op[oc]=0;
148 oc--;
149 }
150 if(txt[c]=='-'){
151 nc++;
152 ng[nc]=txt[c];
153 }
154 }
155 if(oc!=0){
156 while(oc!=0){
157 fc++;
158 ft[fc]=op[oc];
159 oc--;
160 }
161 }
162 for(c=1;c<=fc;c++){
163 printf("%c",ft[c]);
164 }
165 printf("\n");
166 for(c=0;c<100;c++){
167 ng[c]=op[c]=0;
168 }
169 int p,q,r,ans;
170 ans=0;
171 for(p=0;p<3;p++){
172 for(q=0;q<3;q++){
173 for(r=0;r<3;r++){
174 if(F(p,q,r,ft,fc)==2){
175 ans++;
176 }
177 }
178 }
179 }
180 printf("%d\n",ans);
181 }
182 return 0;
183 }
```
**Question**: Does line `66` have control dependence over line `78` in function `F`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 66
}
|
{
"line": 78
}
|
codenet_p00736_s631138606_F_3_85.yaml
|
codenet_p00736_s631138606_F_3_85.c
|
p00736
|
s631138606
|
F
| 3
| 85
|
codenet
|
C
| 41
| 78
| true
|
control_codenet_p00736_s631138606_F_3_85_fit_78_3
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include<stdio.h>
2 #include<string.h>
3 int F(int p,int q,int r,char ft[100],int fc){
4 int fit[100],ic,x,t;
5 ic=1;
6 for(t=0;t<100;t++){
7 fit[t]=0;
8 }
9 while(ic<fc){
10 if(ft[ic]=='P'){
11 fit[ic]=p;
12 }
13 if(ft[ic]=='Q'){
14 fit[ic]=q;
15 }
16 if(ft[ic]=='R'){
17 fit[ic]=r;
18 }
19 if(ft[ic]=='0'){
20 fit[ic]=0;
21 }
22 if(ft[ic]=='1'){
23 fit[ic]=1;
24 }
25 if(ft[ic]=='2'){
26 fit[ic]=2;
27 }
28 if(ft[ic]=='+'){
29 fit[ic]=3;
30 }
31 if(ft[ic]=='-'){
32 fit[ic]=4;
33 }
34 if(ft[ic]=='*'){
35 fit[ic]=5;
36 }
37 ic++;
38 }
39 ic--;
40 x=1;
41 while(x<ic){
42 if(fit[x]==3){
43 if(fit[x-1]==0&&fit[x-2]==0){
44 fit[x-2]=0;
45 }
46 else if(fit[x-1]==2||fit[x-2]==2){
47 fit[x-2]=2;
48 }
49 else{
50 fit[x-2]=1;
51 }
52 ic-=2;
53 for(t=x-1;t<=ic;t++){
54 fit[t]=fit[t+2];
55 }
56 x-=2;
57 }
58 if(fit[x]==4){
59 fit[x-1]=2-fit[x-1];
60 ic--;
61 for(t=x;t<=ic;t++){
62 fit[t]=fit[t+1];
63 }
64 x--;
65 }
66 if(fit[x]==5){
67 if(fit[x-1]==0||fit[x-2]==0){
68 fit[x-2]=0;
69 }
70 else if(fit[x-1]==2&&fit[x-2]==2){
71 fit[x-2]=2;
72 }
73 else{
74 fit[x-2]=1;
75 }
76 ic-=2;
77 for(t=x-1;t<=ic;t++){
78 fit[t]=fit[t+2];
79 }
80 x-=2;
81 }
82 x++;
83 }
84 return fit[1];
85 }
86 int main(void){
87 int c,nc,oc,fc;
88 char txt[100],ng[100],op[100],ft[100];
89 while(1){
90 scanf("%s",&txt);
91 if(txt[0]=='.'){
92 break;
93 }
94 nc=oc=fc=0;
95 for(c=0;c<strlen(txt);c++){
96 if(txt[c]==0||txt[c]==1||txt[c]==2||txt[c]=='P'||txt[c]=='Q'||txt[c]=='R'){
97 fc++;
98 ft[fc]=txt[c];
99 if(nc!=0){
100 while(nc!=0){
101 fc++;
102 ft[fc]=ng[nc];
103 nc--;
104 }
105 }
106 }
107 if(txt[c]=='+'){
108 if(oc==0||op[oc]=='('){
109 oc++;
110 op[oc]=txt[c];
111 }
112 else{
113 while(oc!=0){
114 fc++;
115 ft[fc]=op[oc];
116 oc--;
117 }
118 oc++;
119 op[oc]=txt[c];
120 }
121 }
122 if(txt[c]=='*'){
123 if(oc==0||op[oc]=='+'||op[oc]=='('){
124 oc++;
125 op[oc]=txt[c];
126 }
127 else{
128 while(oc!=0){
129 fc++;
130 ft[fc]=op[oc];
131 oc--;
132 }
133 oc++;
134 op[oc]=txt[c];
135 }
136 }
137 if(txt[c]=='('){
138 oc++;
139 op[oc]=txt[c];
140 }
141 if(txt[c]==')'){
142 while(op[oc]!='('){
143 fc++;
144 ft[fc]=op[oc];
145 oc--;
146 }
147 op[oc]=0;
148 oc--;
149 }
150 if(txt[c]=='-'){
151 nc++;
152 ng[nc]=txt[c];
153 }
154 }
155 if(oc!=0){
156 while(oc!=0){
157 fc++;
158 ft[fc]=op[oc];
159 oc--;
160 }
161 }
162 for(c=1;c<=fc;c++){
163 printf("%c",ft[c]);
164 }
165 printf("\n");
166 for(c=0;c<100;c++){
167 ng[c]=op[c]=0;
168 }
169 int p,q,r,ans;
170 ans=0;
171 for(p=0;p<3;p++){
172 for(q=0;q<3;q++){
173 for(r=0;r<3;r++){
174 if(F(p,q,r,ft,fc)==2){
175 ans++;
176 }
177 }
178 }
179 }
180 printf("%d\n",ans);
181 }
182 return 0;
183 }
```
**Question**: Does line `41` have control dependence over line `78` in function `F`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 41
}
|
{
"line": 78
}
|
codenet_p00736_s631138606_F_3_85.yaml
|
codenet_p00736_s631138606_F_3_85.c
|
p00736
|
s631138606
|
F
| 3
| 85
|
codenet
|
C
| 22
| 78
| false
|
control_codenet_p00736_s631138606_F_3_85_fit_78_4
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include<stdio.h>
2 #include<string.h>
3 int F(int p,int q,int r,char ft[100],int fc){
4 int fit[100],ic,x,t;
5 ic=1;
6 for(t=0;t<100;t++){
7 fit[t]=0;
8 }
9 while(ic<fc){
10 if(ft[ic]=='P'){
11 fit[ic]=p;
12 }
13 if(ft[ic]=='Q'){
14 fit[ic]=q;
15 }
16 if(ft[ic]=='R'){
17 fit[ic]=r;
18 }
19 if(ft[ic]=='0'){
20 fit[ic]=0;
21 }
22 if(ft[ic]=='1'){
23 fit[ic]=1;
24 }
25 if(ft[ic]=='2'){
26 fit[ic]=2;
27 }
28 if(ft[ic]=='+'){
29 fit[ic]=3;
30 }
31 if(ft[ic]=='-'){
32 fit[ic]=4;
33 }
34 if(ft[ic]=='*'){
35 fit[ic]=5;
36 }
37 ic++;
38 }
39 ic--;
40 x=1;
41 while(x<ic){
42 if(fit[x]==3){
43 if(fit[x-1]==0&&fit[x-2]==0){
44 fit[x-2]=0;
45 }
46 else if(fit[x-1]==2||fit[x-2]==2){
47 fit[x-2]=2;
48 }
49 else{
50 fit[x-2]=1;
51 }
52 ic-=2;
53 for(t=x-1;t<=ic;t++){
54 fit[t]=fit[t+2];
55 }
56 x-=2;
57 }
58 if(fit[x]==4){
59 fit[x-1]=2-fit[x-1];
60 ic--;
61 for(t=x;t<=ic;t++){
62 fit[t]=fit[t+1];
63 }
64 x--;
65 }
66 if(fit[x]==5){
67 if(fit[x-1]==0||fit[x-2]==0){
68 fit[x-2]=0;
69 }
70 else if(fit[x-1]==2&&fit[x-2]==2){
71 fit[x-2]=2;
72 }
73 else{
74 fit[x-2]=1;
75 }
76 ic-=2;
77 for(t=x-1;t<=ic;t++){
78 fit[t]=fit[t+2];
79 }
80 x-=2;
81 }
82 x++;
83 }
84 return fit[1];
85 }
86 int main(void){
87 int c,nc,oc,fc;
88 char txt[100],ng[100],op[100],ft[100];
89 while(1){
90 scanf("%s",&txt);
91 if(txt[0]=='.'){
92 break;
93 }
94 nc=oc=fc=0;
95 for(c=0;c<strlen(txt);c++){
96 if(txt[c]==0||txt[c]==1||txt[c]==2||txt[c]=='P'||txt[c]=='Q'||txt[c]=='R'){
97 fc++;
98 ft[fc]=txt[c];
99 if(nc!=0){
100 while(nc!=0){
101 fc++;
102 ft[fc]=ng[nc];
103 nc--;
104 }
105 }
106 }
107 if(txt[c]=='+'){
108 if(oc==0||op[oc]=='('){
109 oc++;
110 op[oc]=txt[c];
111 }
112 else{
113 while(oc!=0){
114 fc++;
115 ft[fc]=op[oc];
116 oc--;
117 }
118 oc++;
119 op[oc]=txt[c];
120 }
121 }
122 if(txt[c]=='*'){
123 if(oc==0||op[oc]=='+'||op[oc]=='('){
124 oc++;
125 op[oc]=txt[c];
126 }
127 else{
128 while(oc!=0){
129 fc++;
130 ft[fc]=op[oc];
131 oc--;
132 }
133 oc++;
134 op[oc]=txt[c];
135 }
136 }
137 if(txt[c]=='('){
138 oc++;
139 op[oc]=txt[c];
140 }
141 if(txt[c]==')'){
142 while(op[oc]!='('){
143 fc++;
144 ft[fc]=op[oc];
145 oc--;
146 }
147 op[oc]=0;
148 oc--;
149 }
150 if(txt[c]=='-'){
151 nc++;
152 ng[nc]=txt[c];
153 }
154 }
155 if(oc!=0){
156 while(oc!=0){
157 fc++;
158 ft[fc]=op[oc];
159 oc--;
160 }
161 }
162 for(c=1;c<=fc;c++){
163 printf("%c",ft[c]);
164 }
165 printf("\n");
166 for(c=0;c<100;c++){
167 ng[c]=op[c]=0;
168 }
169 int p,q,r,ans;
170 ans=0;
171 for(p=0;p<3;p++){
172 for(q=0;q<3;q++){
173 for(r=0;r<3;r++){
174 if(F(p,q,r,ft,fc)==2){
175 ans++;
176 }
177 }
178 }
179 }
180 printf("%d\n",ans);
181 }
182 return 0;
183 }
```
**Question**: Does line `22` have control dependence over line `78` in function `F`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 22
}
|
{
"line": 78
}
|
codenet_p00736_s631138606_F_3_85.yaml
|
codenet_p00736_s631138606_F_3_85.c
|
p00736
|
s631138606
|
F
| 3
| 85
|
codenet
|
C
| 43
| 78
| false
|
control_codenet_p00736_s631138606_F_3_85_fit_78_5
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include<stdio.h>
2 #include<string.h>
3 int F(int p,int q,int r,char ft[100],int fc){
4 int fit[100],ic,x,t;
5 ic=1;
6 for(t=0;t<100;t++){
7 fit[t]=0;
8 }
9 while(ic<fc){
10 if(ft[ic]=='P'){
11 fit[ic]=p;
12 }
13 if(ft[ic]=='Q'){
14 fit[ic]=q;
15 }
16 if(ft[ic]=='R'){
17 fit[ic]=r;
18 }
19 if(ft[ic]=='0'){
20 fit[ic]=0;
21 }
22 if(ft[ic]=='1'){
23 fit[ic]=1;
24 }
25 if(ft[ic]=='2'){
26 fit[ic]=2;
27 }
28 if(ft[ic]=='+'){
29 fit[ic]=3;
30 }
31 if(ft[ic]=='-'){
32 fit[ic]=4;
33 }
34 if(ft[ic]=='*'){
35 fit[ic]=5;
36 }
37 ic++;
38 }
39 ic--;
40 x=1;
41 while(x<ic){
42 if(fit[x]==3){
43 if(fit[x-1]==0&&fit[x-2]==0){
44 fit[x-2]=0;
45 }
46 else if(fit[x-1]==2||fit[x-2]==2){
47 fit[x-2]=2;
48 }
49 else{
50 fit[x-2]=1;
51 }
52 ic-=2;
53 for(t=x-1;t<=ic;t++){
54 fit[t]=fit[t+2];
55 }
56 x-=2;
57 }
58 if(fit[x]==4){
59 fit[x-1]=2-fit[x-1];
60 ic--;
61 for(t=x;t<=ic;t++){
62 fit[t]=fit[t+1];
63 }
64 x--;
65 }
66 if(fit[x]==5){
67 if(fit[x-1]==0||fit[x-2]==0){
68 fit[x-2]=0;
69 }
70 else if(fit[x-1]==2&&fit[x-2]==2){
71 fit[x-2]=2;
72 }
73 else{
74 fit[x-2]=1;
75 }
76 ic-=2;
77 for(t=x-1;t<=ic;t++){
78 fit[t]=fit[t+2];
79 }
80 x-=2;
81 }
82 x++;
83 }
84 return fit[1];
85 }
86 int main(void){
87 int c,nc,oc,fc;
88 char txt[100],ng[100],op[100],ft[100];
89 while(1){
90 scanf("%s",&txt);
91 if(txt[0]=='.'){
92 break;
93 }
94 nc=oc=fc=0;
95 for(c=0;c<strlen(txt);c++){
96 if(txt[c]==0||txt[c]==1||txt[c]==2||txt[c]=='P'||txt[c]=='Q'||txt[c]=='R'){
97 fc++;
98 ft[fc]=txt[c];
99 if(nc!=0){
100 while(nc!=0){
101 fc++;
102 ft[fc]=ng[nc];
103 nc--;
104 }
105 }
106 }
107 if(txt[c]=='+'){
108 if(oc==0||op[oc]=='('){
109 oc++;
110 op[oc]=txt[c];
111 }
112 else{
113 while(oc!=0){
114 fc++;
115 ft[fc]=op[oc];
116 oc--;
117 }
118 oc++;
119 op[oc]=txt[c];
120 }
121 }
122 if(txt[c]=='*'){
123 if(oc==0||op[oc]=='+'||op[oc]=='('){
124 oc++;
125 op[oc]=txt[c];
126 }
127 else{
128 while(oc!=0){
129 fc++;
130 ft[fc]=op[oc];
131 oc--;
132 }
133 oc++;
134 op[oc]=txt[c];
135 }
136 }
137 if(txt[c]=='('){
138 oc++;
139 op[oc]=txt[c];
140 }
141 if(txt[c]==')'){
142 while(op[oc]!='('){
143 fc++;
144 ft[fc]=op[oc];
145 oc--;
146 }
147 op[oc]=0;
148 oc--;
149 }
150 if(txt[c]=='-'){
151 nc++;
152 ng[nc]=txt[c];
153 }
154 }
155 if(oc!=0){
156 while(oc!=0){
157 fc++;
158 ft[fc]=op[oc];
159 oc--;
160 }
161 }
162 for(c=1;c<=fc;c++){
163 printf("%c",ft[c]);
164 }
165 printf("\n");
166 for(c=0;c<100;c++){
167 ng[c]=op[c]=0;
168 }
169 int p,q,r,ans;
170 ans=0;
171 for(p=0;p<3;p++){
172 for(q=0;q<3;q++){
173 for(r=0;r<3;r++){
174 if(F(p,q,r,ft,fc)==2){
175 ans++;
176 }
177 }
178 }
179 }
180 printf("%d\n",ans);
181 }
182 return 0;
183 }
```
**Question**: Does line `43` have control dependence over line `78` in function `F`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 43
}
|
{
"line": 78
}
|
codenet_p00736_s631138606_F_3_85.yaml
|
codenet_p00736_s631138606_F_3_85.c
|
p00736
|
s631138606
|
F
| 3
| 85
|
codenet
|
C
| 70
| 78
| false
|
control_codenet_p00736_s631138606_F_3_85_fit_78_6
|
[INSTRUCTIONS]
You are a program-analysis assistant. Your task is to statically analyze the control dependence of a given code snippet.
## 1. Control Dependence Definition
Control dependence captures the influence of control-flow decisions on the execution of statements.
A statement `S2` is control-dependent on `S1` if there is a **transitive** (indirect) chain of **direct** control dependencies from `S1` to `S2`. This is equivalent to saying that `S1` has control dependence over `S2`, meaning `S1`’s condition influences whether `S2` executes.
**Direct Control Dependence**:
A statement `S2` is **directly** control-dependent on a statement `S1` if:
1. `S1` is a conditional control statement (e.g., an `if`, `while`, `for`, `switch`, etc.).
2. `S1` directly determines whether `S2` executes. That is, `S1` has multiple successor branches,
- there exists **at least one branch** in which `S2` **always executes**, and
- there exists **at least one other branch** in which `S2` does **not necessarily execute**.
“Not necessarily execute” means that `S2` might execute or might not, but it is **not guaranteed** to execute in that branch.
`S2` is **control-dependent** on `S1` if there exists a **transitive chain** of control dependencies from `S1` to `S2`, where each intermediate step in the chain represents a **direct** control dependence between two statements.
## 2. Output Format
When asked, “Does line `S1` have control dependence over line `S2`? If so, provide a trace.” You should respond in JSON format as follows:
- If there is a control dependence:
```json
{
"ControlDependence": true,
"Trace": [S1, ..., S2]
}
```
- If there is no control dependence:
```json
{
"ControlDependence": false
}
```
A **trace** represents a **transitive control flow**, where each adjacent pair in the list reflects a **direct** control dependence. The trace must starts with `S1` and ends with `S2`.
## 3. Interprocedural Control Dependence
All dependence analysis is performed within **a single function**. We do not track dependencies across function boundaries. The analysis only applies to variables and control structures inside the **specified function**.
## 4. Example Code Snippet
### Example 1
```python
1 if x > 0:
2 y = 10 # this line is directly control-dependent on line 1 (x>0)
3 if y > 5:
4 z = 20 # this line is directly control-dependent on line 3 (y>5)
5 w = 30 # this line is directly control-dependent on line 3 (y>5)
6 v = 40 # this line is NOT control-dependent on any line
```
**Analysis**:
- Line 2 is directly control-dependent on line 1 (`x>0`)
- Lines 4 and 5 are directly control-dependent on line 3 (`y>5`).
- Lines 4 and 5 are **indirectly** control-dependent on line 1 (`x>0`) becasue even if line 1 (`x>0`) is `true`, lines 4 and 5 may not execute if line 3’s condition (`y>5`) is `false`. However, since control dependence is transitive, lines 4 and 5 are **indirectly** control-dependent on line 1.
- Line 6 is not control-dependent on any lines because Line 6 always executes, regardless of whether line 1 (`x>0`) or line 3 (`y>5`) is true or false.
#### Example Question 1.1:
Does line `1` have control dependence over line `5`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [1, 3, 5]
}
```
#### Example Question 1.2:
Does line `3` have control dependence over line `6`? If so, provide a trace.
**Output**:
```json
{
"ControlDependence": false
}
```
### Example 2
```python
1 count = 0
2 if count < 5:
3 count += 1
4 print("Step 1 done")
5 while count < 10:
6 if count == 7:
7 break
8 if count % 2 == 0:
9 continue
10 count += 2
11 if count > 9:
12 count = 9
13 print("Iteration done")
14 print("End of program")
```
#### Example Question 2.1:
Does line `5` have control dependence over line `13`? If so, provide a trace.
**Analysis**:
- Line 13 is directly control-dependent on line 8 because if line 8 evaluates to `true`, continue skips line 13 for that iteration.
- Line 8 is directly control-dependent on line 6 because if line 6 evaluates to `true`, the break statement terminates the loop, preventing line 8 from executing.
- Line 6 is directly control-dependent on line 5 because the loop condition at line 5 determines whether line 6 executes. If line 5 evaluates to `false`, execution skips the loop entirely.
Since control dependence is transitive, line 5 indirectly controls line 13 through lines 6 and 8. The trace is `5->6->8->13`.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [5, 6, 8, 13]
}
```
#### Example Question 2.2:
Does line `8` have control dependence over line `10`? If so, provide a trace.
**Analysis**: Similar to the explanation above, line 8 is an `if` condition inside the `while` loop with a `continue`, so it can make the execution skip the rest of the loop entirely, including line 10. Therefore, line 10 directly control-dependent on 8.
**Output**:
```json
{
"ControlDependence": true,
"Trace": [8, 10]
}
```
#### Example Question 2.3:
Does line `5` have control dependence over line `14`? If so, provide a trace.
**Analysis**: Line 5 doesn't affect whether line 14 is reached. Line 14 is outside the while loop (lines 5 -- 13) and will be executed regardless of the condition.
**Output**:
```json
{
"ControlDependence": false
}
```
#### Example Question 2.4:
Does line `2` have control dependence over line `12`? If so, provide a trace.
**Analysis**: Line 2 doesn't affect whether line 12 is reached. The condition in line 2 only controls whether line 3 is executed. Line 12 is in while loop (line 5 -- 13) and will or will not be executed regardless of the condition in line 2.
**Output**:
```json
{
"ControlDependence": false
}
```
---
[YOUR TURN]
Below is **your target snippet**.
```C
1 #include<stdio.h>
2 #include<string.h>
3 int F(int p,int q,int r,char ft[100],int fc){
4 int fit[100],ic,x,t;
5 ic=1;
6 for(t=0;t<100;t++){
7 fit[t]=0;
8 }
9 while(ic<fc){
10 if(ft[ic]=='P'){
11 fit[ic]=p;
12 }
13 if(ft[ic]=='Q'){
14 fit[ic]=q;
15 }
16 if(ft[ic]=='R'){
17 fit[ic]=r;
18 }
19 if(ft[ic]=='0'){
20 fit[ic]=0;
21 }
22 if(ft[ic]=='1'){
23 fit[ic]=1;
24 }
25 if(ft[ic]=='2'){
26 fit[ic]=2;
27 }
28 if(ft[ic]=='+'){
29 fit[ic]=3;
30 }
31 if(ft[ic]=='-'){
32 fit[ic]=4;
33 }
34 if(ft[ic]=='*'){
35 fit[ic]=5;
36 }
37 ic++;
38 }
39 ic--;
40 x=1;
41 while(x<ic){
42 if(fit[x]==3){
43 if(fit[x-1]==0&&fit[x-2]==0){
44 fit[x-2]=0;
45 }
46 else if(fit[x-1]==2||fit[x-2]==2){
47 fit[x-2]=2;
48 }
49 else{
50 fit[x-2]=1;
51 }
52 ic-=2;
53 for(t=x-1;t<=ic;t++){
54 fit[t]=fit[t+2];
55 }
56 x-=2;
57 }
58 if(fit[x]==4){
59 fit[x-1]=2-fit[x-1];
60 ic--;
61 for(t=x;t<=ic;t++){
62 fit[t]=fit[t+1];
63 }
64 x--;
65 }
66 if(fit[x]==5){
67 if(fit[x-1]==0||fit[x-2]==0){
68 fit[x-2]=0;
69 }
70 else if(fit[x-1]==2&&fit[x-2]==2){
71 fit[x-2]=2;
72 }
73 else{
74 fit[x-2]=1;
75 }
76 ic-=2;
77 for(t=x-1;t<=ic;t++){
78 fit[t]=fit[t+2];
79 }
80 x-=2;
81 }
82 x++;
83 }
84 return fit[1];
85 }
86 int main(void){
87 int c,nc,oc,fc;
88 char txt[100],ng[100],op[100],ft[100];
89 while(1){
90 scanf("%s",&txt);
91 if(txt[0]=='.'){
92 break;
93 }
94 nc=oc=fc=0;
95 for(c=0;c<strlen(txt);c++){
96 if(txt[c]==0||txt[c]==1||txt[c]==2||txt[c]=='P'||txt[c]=='Q'||txt[c]=='R'){
97 fc++;
98 ft[fc]=txt[c];
99 if(nc!=0){
100 while(nc!=0){
101 fc++;
102 ft[fc]=ng[nc];
103 nc--;
104 }
105 }
106 }
107 if(txt[c]=='+'){
108 if(oc==0||op[oc]=='('){
109 oc++;
110 op[oc]=txt[c];
111 }
112 else{
113 while(oc!=0){
114 fc++;
115 ft[fc]=op[oc];
116 oc--;
117 }
118 oc++;
119 op[oc]=txt[c];
120 }
121 }
122 if(txt[c]=='*'){
123 if(oc==0||op[oc]=='+'||op[oc]=='('){
124 oc++;
125 op[oc]=txt[c];
126 }
127 else{
128 while(oc!=0){
129 fc++;
130 ft[fc]=op[oc];
131 oc--;
132 }
133 oc++;
134 op[oc]=txt[c];
135 }
136 }
137 if(txt[c]=='('){
138 oc++;
139 op[oc]=txt[c];
140 }
141 if(txt[c]==')'){
142 while(op[oc]!='('){
143 fc++;
144 ft[fc]=op[oc];
145 oc--;
146 }
147 op[oc]=0;
148 oc--;
149 }
150 if(txt[c]=='-'){
151 nc++;
152 ng[nc]=txt[c];
153 }
154 }
155 if(oc!=0){
156 while(oc!=0){
157 fc++;
158 ft[fc]=op[oc];
159 oc--;
160 }
161 }
162 for(c=1;c<=fc;c++){
163 printf("%c",ft[c]);
164 }
165 printf("\n");
166 for(c=0;c<100;c++){
167 ng[c]=op[c]=0;
168 }
169 int p,q,r,ans;
170 ans=0;
171 for(p=0;p<3;p++){
172 for(q=0;q<3;q++){
173 for(r=0;r<3;r++){
174 if(F(p,q,r,ft,fc)==2){
175 ans++;
176 }
177 }
178 }
179 }
180 printf("%d\n",ans);
181 }
182 return 0;
183 }
```
**Question**: Does line `70` have control dependence over line `78` in function `F`? If so, provide a trace.
**Output**:
|
trace
|
{
"line": 70
}
|
{
"line": 78
}
|
End of preview.