| Issue |
179662
|
| Summary |
llvm-cov / clang reports unreachable code as executed when function exits via exit()
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
ankurrj7
|
We have observed cases where code coverage reports generated using icx and llvm-cov mark unreachable code as executed, even though control flow cannot reach those lines at runtime.
In particular, when a function calls exit(), the compiler and coverage tools do not treat this call as a non-returning path, resulting in incorrect basic block / region coverage.
This leads to misleading coverage reports.
basic_block.c
1| |#include <stdio.h>
2| |#include <unistd.h>
3| |#include <stdlib.h>
4| |
5| |
6| |void fun1()
7| 1|{
8| 1| printf("In some func never return\n");
9| 1| exit(0);
10| 1|}
11| |
12| |int main(void)
13| 1|{
14| 1| puts("This is a shared library test...");
15| 1| fun1(); // this will never return
16| 1| printf("Hello 1\n"); // This is not reachable code , and cannot be marked as Hit
17| 1| if (1) {
18| 0| printf("Hello 2\n");
19| 0| }
20| 1| return 0;
21| 1|}
22| |
Here by no chance line number 16 should be marked as hit as func1 never returns .
problem here is icx is not treating function call as end of previous region /block
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