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//===-- sanitizer_stacktrace_libcdep.cc -----------------------------------===//
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is shared between AddressSanitizer and ThreadSanitizer
// run-time libraries.
//===----------------------------------------------------------------------===//
#include "sanitizer_common.h"
#include "sanitizer_placement_new.h"
#include "sanitizer_stacktrace.h"
#include "sanitizer_stacktrace_printer.h"
#include "sanitizer_symbolizer.h"
namespace __sanitizer {
void StackTrace::Print() const {
if (trace == nullptr || size == 0) {
Printf(" <empty stack>\n\n");
return;
}
const int kMaxAddrFrames = 64;
InternalScopedBuffer<AddressInfo> addr_frames(kMaxAddrFrames);
for (uptr i = 0; i < kMaxAddrFrames; i++)
new(&addr_frames[i]) AddressInfo();
InternalScopedString frame_desc(GetPageSizeCached() * 2);
uptr frame_num = 0;
for (uptr i = 0; i < size && trace[i]; i++) {
// PCs in stack traces are actually the return addresses, that is,
// addresses of the next instructions after the call.
uptr pc = GetPreviousInstructionPc(trace[i]);
uptr addr_frames_num = Symbolizer::GetOrInit()->SymbolizePC(
pc, addr_frames.data(), kMaxAddrFrames);
if (addr_frames_num == 0) {
addr_frames[0].address = pc;
addr_frames_num = 1;
}
for (uptr j = 0; j < addr_frames_num; j++) {
AddressInfo &info = addr_frames[j];
frame_desc.clear();
RenderFrame(&frame_desc, common_flags()->stack_trace_format, frame_num++,
info, common_flags()->strip_path_prefix);
Printf("%s\n", frame_desc.data());
info.Clear();
}
}
// Always print a trailing empty line after stack trace.
Printf("\n");
}
void BufferedStackTrace::Unwind(uptr max_depth, uptr pc, uptr bp, void *context,
uptr stack_top, uptr stack_bottom,
bool request_fast_unwind) {
top_frame_bp = (max_depth > 0) ? bp : 0;
// Avoid doing any work for small max_depth.
if (max_depth == 0) {
size = 0;
return;
}
if (max_depth == 1) {
size = 1;
trace_buffer[0] = pc;
return;
}
if (!WillUseFastUnwind(request_fast_unwind)) {
if (context)
SlowUnwindStackWithContext(pc, context, max_depth);
else
SlowUnwindStack(pc, max_depth);
} else {
FastUnwindStack(pc, bp, stack_top, stack_bottom, max_depth);
}
}
} // namespace __sanitizer
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