| Issue |
56008
|
| Summary |
[RISCV] Stack space ins't de-allocate immediately might cause stack overflow
|
| Labels |
backend:RISC-V
|
| Assignees |
|
| Reporter |
kito-cheng
|
In this https://reviews.llvm.org/D126861 patch we try to fixed a mis-compile for a run-time failed https://github.com/llvm/llvm-project/issues/55442 , however there still another issue: the stack isn't de-allocate after exception handling immediately, that might cause stack overflow the exception is happened within a loop:
Reduced case:
```
void foo(int, int, int, int, int, int, int, int, int, int);
bool check_frame_variant(int n) {
int exception_value = 1;
int j;
for (j=0;j < n;j++) {
try {
// Allocate stack for out-going argument
foo(0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
// De-allocate stack for out-going argument, that won't release if we go exception from foo.
} catch (int i) {
exception_value += i;
}
}
// Restore sp from fp
return exception_value;
}
```
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