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Use when loop counters are initialized outside the loop and side-effecting expressions (like printf with branching arguments) are embedded in the for-statement's increment clause
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Use when printf statements output strings without trailing newlines
Use when array is accessed with direct user input as index (0-based indexing)
Use when the program accesses a precomputed table using an offset (e.g., arr[n-1]) that introduces an arithmetic operation between the symbolic input and the index
Use when loop variables iterate over character values (e.g., ASCII codes) to represent different operations or choices
Use when code uses a loop to search for an input value in an array and then uses the found index for further computation
Use when code reads a fixed number of characters into an array and only accesses individual elements
Baseado na classificação ocupacional SOC
| name | avoid-side-effects-in-loop-headers |
| description | Use when loop counters are initialized outside the loop and side-effecting expressions (like printf with branching arguments) are embedded in the for-statement's increment clause |
A KLEE-coverage code transformation. Applying it rewrites C source so symbolic execution explores more of the program's behavior.
When loop counters are initialized outside the loop and side-effecting expressions (like printf with branching arguments) are embedded in the for-statement's increment clause
Move side-effecting computations into the loop body and declare loop variables locally with standard init/condition/increment, separating control flow from output side effects
KLEE tracks symbolic state more efficiently when branching expressions appear in straightforward statement positions rather than buried in for-loop increment clauses; this exposes branch points clearly to the symbolic executor and reduces path-merging complexity, improving constraint solving and coverage replay
Before:
#include<stdio.h>
int main(){
int H,W,h,w,i=1,j;
scanf("%d%d%d%d",&H,&W,&h,&w);
if(H%h||W%w){
for(puts("Yes");i<=H;++i,puts("")) for(j=0;j<W;++j,printf("%d ",(i%h||j%w)?1000:-1000*(h*w-1)-1));
}else puts("No");
return 0;
}
After:
#include<stdio.h>
int main(){int H,W,h,w;scanf("%d%d%d%d",&H,&W,&h,&w);if(H%h||W%w){puts("Yes");for(int i=1;i<=H;++i,puts("")) for(int j=1;j<=W;++j)printf("%d ",(i%h||j%w)?1000:-1000*(h*w-1)-1);}else puts("No");return 0;}
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