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Allocate memory for frames and sizes during stack trace fix-up when no memory is provided

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PiperOrigin-RevId: 784266735
Change-Id: I537a6472ce284e97734d56ccff1863108ed3eb39
This commit is contained in:
Abseil Team
2025-07-17 12:07:36 -07:00
committed by Copybara-Service
parent 9f1244cb3f
commit f2dd73d7a8
1 changed files with 26 additions and 0 deletions
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26
absl/debugging/stacktrace.cc
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@@ -124,6 +124,19 @@ ABSL_ATTRIBUTE_NOINLINE ABSL_ATTRIBUTE_NO_TAIL_CALL int
internal_stacktrace::GetStackFrames(void** result, uintptr_t* frames,
int* sizes, int max_depth, int skip_count) {
if (internal_stacktrace::ShouldFixUpStack()) {
if constexpr (kHaveAlloca) {
// Some implementations of FixUpStack may need to be passed frame
// information from Unwind, even if the caller doesn't need that
// information. We allocate the necessary buffers for such implementations
// here.
const size_t nmax = static_cast<size_t>(max_depth);
if (frames == nullptr) {
frames = static_cast<uintptr_t*>(alloca(nmax * sizeof(*frames)));
}
if (sizes == nullptr) {
sizes = static_cast<int*>(alloca(nmax * sizeof(*sizes)));
}
}
size_t depth = static_cast<size_t>(Unwind<true, true>(
result, frames, sizes, max_depth, skip_count, nullptr, nullptr));
internal_stacktrace::FixUpStack(result, frames, sizes,
@@ -141,6 +154,19 @@ internal_stacktrace::GetStackFramesWithContext(void** result, uintptr_t* frames,
int skip_count, const void* uc,
int* min_dropped_frames) {
if (internal_stacktrace::ShouldFixUpStack()) {
if constexpr (kHaveAlloca) {
// Some implementations of FixUpStack may need to be passed frame
// information from Unwind, even if the caller doesn't need that
// information. We allocate the necessary buffers for such implementations
// here.
const size_t nmax = static_cast<size_t>(max_depth);
if (frames == nullptr) {
frames = static_cast<uintptr_t*>(alloca(nmax * sizeof(*frames)));
}
if (sizes == nullptr) {
sizes = static_cast<int*>(alloca(nmax * sizeof(*sizes)));
}
}
size_t depth = static_cast<size_t>(Unwind<true, true>(
result, frames, sizes, max_depth, skip_count, uc, min_dropped_frames));
internal_stacktrace::FixUpStack(result, frames, sizes,