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Reduce stack usage when unwinding from 170 to 128 on x64

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PiperOrigin-RevId: 830569454
Change-Id: If5f56cc64ad1f3fe2de45c273b2567ba6ebfe9ed
This commit is contained in:
Abseil Team
2025-11-10 13:08:51 -08:00
committed by Copybara-Service
parent ff43958956
commit 29d24c5fd3
1 changed files with 5 additions and 4 deletions
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9
absl/debugging/stacktrace.cc
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@@ -80,11 +80,12 @@ ABSL_ATTRIBUTE_ALWAYS_INLINE inline int Unwind(void** result, uintptr_t* frames,
int skip_count, const void* uc,
int* min_dropped_frames,
bool unwind_with_fixup = true) {
static constexpr size_t kMinPageSize = 4096;
static constexpr size_t kMaxStackElements = 128;
// Allow up to ~half a page, leaving some slack space for local variables etc.
static constexpr size_t kMaxStackElements =
(kMinPageSize / 2) / (sizeof(*frames) + sizeof(*sizes));
static constexpr size_t kMinPageSize = 4096;
static_assert(
kMaxStackElements * (sizeof(*frames) + sizeof(*sizes)) < kMinPageSize / 2,
"buffer size should be a fraction of a page to avoid stack overflows");
// Allocate a buffer dynamically, using the signal-safe allocator.
static constexpr auto allocate = [](size_t num_bytes) -> void* {