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//===-- asan_debugging.cc -------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer, an address sanity checker.
//
// This file contains various functions that are generally useful to call when
// using a debugger (LLDB, GDB).
//===----------------------------------------------------------------------===//
#include "asan_allocator.h"
#include "asan_flags.h"
#include "asan_internal.h"
#include "asan_mapping.h"
#include "asan_thread.h"
namespace __asan {
uptr AsanGetStack(uptr addr, uptr *trace, uptr size, u32 *thread_id,
bool alloc_stack) {
AsanChunkView chunk = FindHeapChunkByAddress(addr);
if (!chunk.IsValid()) return 0;
StackTrace stack;
if (alloc_stack) {
if (chunk.AllocTid() == kInvalidTid) return 0;
chunk.GetAllocStack(&stack);
if (thread_id) *thread_id = chunk.AllocTid();
} else {
if (chunk.FreeTid() == kInvalidTid) return 0;
chunk.GetFreeStack(&stack);
if (thread_id) *thread_id = chunk.FreeTid();
}
if (trace && size) {
if (size > kStackTraceMax)
size = kStackTraceMax;
if (size > stack.size)
size = stack.size;
for (uptr i = 0; i < size; i++)
trace[i] = StackTrace::GetPreviousInstructionPc(stack.trace[i]);
return size;
}
return 0;
}
} // namespace __asan
using namespace __asan;
SANITIZER_INTERFACE_ATTRIBUTE
uptr __asan_get_alloc_stack(uptr addr, uptr *trace, uptr size, u32 *thread_id) {
return AsanGetStack(addr, trace, size, thread_id, /* alloc_stack */ true);
}
SANITIZER_INTERFACE_ATTRIBUTE
uptr __asan_get_free_stack(uptr addr, uptr *trace, uptr size, u32 *thread_id) {
return AsanGetStack(addr, trace, size, thread_id, /* alloc_stack */ false);
}
SANITIZER_INTERFACE_ATTRIBUTE
void __asan_get_shadow_mapping(uptr *shadow_scale, uptr *shadow_offset) {
if (shadow_scale)
*shadow_scale = SHADOW_SCALE;
if (shadow_offset)
*shadow_offset = SHADOW_OFFSET;
}
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