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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_stacktrace.h"
#include "sanitizer_symbolizer.h"
namespace __sanitizer {
static void PrintStackFramePrefix(InternalScopedString *buffer, uptr frame_num,
uptr pc) {
buffer->append(" #%zu 0x%zx", frame_num, pc);
}
void StackTrace::PrintStack(const uptr *addr, uptr size) {
if (addr == 0 || size == 0) {
Printf(" <empty stack>\n\n");
return;
}
InternalScopedBuffer<char> buff(GetPageSizeCached() * 2);
InternalScopedBuffer<AddressInfo> addr_frames(64);
InternalScopedString frame_desc(GetPageSizeCached() * 2);
uptr frame_num = 0;
for (uptr i = 0; i < size && addr[i]; i++) {
// PCs in stack traces are actually the return addresses, that is,
// addresses of the next instructions after the call.
uptr pc = GetPreviousInstructionPc(addr[i]);
uptr addr_frames_num = Symbolizer::GetOrInit()->SymbolizePC(
pc, addr_frames.data(), addr_frames.size());
for (uptr j = 0; j < addr_frames_num; j++) {
AddressInfo &info = addr_frames[j];
frame_desc.clear();
PrintStackFramePrefix(&frame_desc, frame_num, pc);
if (info.function) {
frame_desc.append(" in %s", info.function);
// Print offset in function if we don't know the source file.
if (!info.file && info.function_offset != AddressInfo::kUnknown)
frame_desc.append("+0x%zx", info.function_offset);
}
if (info.file) {
frame_desc.append(" ");
PrintSourceLocation(&frame_desc, info.file, info.line, info.column);
} else if (info.module) {
frame_desc.append(" ");
PrintModuleAndOffset(&frame_desc, info.module, info.module_offset);
}
Printf("%s\n", frame_desc.data());
frame_num++;
info.Clear();
}
}
// Always print a trailing empty line after stack trace.
Printf("\n");
}
void StackTrace::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[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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