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-rw-r--r--lib/asan/asan_stack.cpp88
1 files changed, 88 insertions, 0 deletions
diff --git a/lib/asan/asan_stack.cpp b/lib/asan/asan_stack.cpp
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index 000000000000..b7f4e6aeeab0
--- /dev/null
+++ b/lib/asan/asan_stack.cpp
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+//===-- asan_stack.cpp ----------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of AddressSanitizer, an address sanity checker.
+//
+// Code for ASan stack trace.
+//===----------------------------------------------------------------------===//
+#include "asan_internal.h"
+#include "asan_stack.h"
+#include "sanitizer_common/sanitizer_atomic.h"
+
+namespace __asan {
+
+static atomic_uint32_t malloc_context_size;
+
+void SetMallocContextSize(u32 size) {
+ atomic_store(&malloc_context_size, size, memory_order_release);
+}
+
+u32 GetMallocContextSize() {
+ return atomic_load(&malloc_context_size, memory_order_acquire);
+}
+
+namespace {
+
+// ScopedUnwinding is a scope for stacktracing member of a context
+class ScopedUnwinding {
+ public:
+ explicit ScopedUnwinding(AsanThread *t) : thread(t) {
+ if (thread) {
+ can_unwind = !thread->isUnwinding();
+ thread->setUnwinding(true);
+ }
+ }
+ ~ScopedUnwinding() {
+ if (thread)
+ thread->setUnwinding(false);
+ }
+
+ bool CanUnwind() const { return can_unwind; }
+
+ private:
+ AsanThread *thread = nullptr;
+ bool can_unwind = true;
+};
+
+} // namespace
+
+} // namespace __asan
+
+void __sanitizer::BufferedStackTrace::UnwindImpl(
+ uptr pc, uptr bp, void *context, bool request_fast, u32 max_depth) {
+ using namespace __asan;
+ size = 0;
+ if (UNLIKELY(!asan_inited))
+ return;
+ request_fast = StackTrace::WillUseFastUnwind(request_fast);
+ AsanThread *t = GetCurrentThread();
+ ScopedUnwinding unwind_scope(t);
+ if (!unwind_scope.CanUnwind())
+ return;
+ if (request_fast) {
+ if (t) {
+ Unwind(max_depth, pc, bp, nullptr, t->stack_top(), t->stack_bottom(),
+ true);
+ }
+ return;
+ }
+ if (SANITIZER_MIPS && t &&
+ !IsValidFrame(bp, t->stack_top(), t->stack_bottom()))
+ return;
+ Unwind(max_depth, pc, bp, context, 0, 0, false);
+}
+
+// ------------------ Interface -------------- {{{1
+
+extern "C" {
+SANITIZER_INTERFACE_ATTRIBUTE
+void __sanitizer_print_stack_trace() {
+ using namespace __asan;
+ PRINT_CURRENT_STACK();
+}
+} // extern "C"