1 //===-- sanitizer_stacktrace_libcdep.cc -----------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is shared between AddressSanitizer and ThreadSanitizer
11 // run-time libraries.
12 //===----------------------------------------------------------------------===//
14 #include "sanitizer_common.h"
15 #include "sanitizer_placement_new.h"
16 #include "sanitizer_stacktrace.h"
17 #include "sanitizer_stacktrace_printer.h"
18 #include "sanitizer_symbolizer.h"
20 namespace __sanitizer {
22 void StackTrace::Print() const {
23 if (trace == nullptr || size == 0) {
24 Printf(" <empty stack>\n\n");
27 InternalScopedString frame_desc(GetPageSizeCached() * 2);
28 InternalScopedString dedup_token(GetPageSizeCached());
29 int dedup_frames = common_flags()->dedup_token_length;
31 for (uptr i = 0; i < size && trace[i]; i++) {
32 // PCs in stack traces are actually the return addresses, that is,
33 // addresses of the next instructions after the call.
34 uptr pc = GetPreviousInstructionPc(trace[i]);
35 SymbolizedStack *frames = Symbolizer::GetOrInit()->SymbolizePC(pc);
37 for (SymbolizedStack *cur = frames; cur; cur = cur->next) {
39 RenderFrame(&frame_desc, common_flags()->stack_trace_format, frame_num++,
40 cur->info, common_flags()->symbolize_vs_style,
41 common_flags()->strip_path_prefix);
42 Printf("%s\n", frame_desc.data());
43 if (dedup_frames-- > 0) {
44 if (dedup_token.length())
45 dedup_token.append("--");
46 dedup_token.append(cur->info.function);
51 // Always print a trailing empty line after stack trace.
53 if (dedup_token.length())
54 Printf("DEDUP_TOKEN: %s\n", dedup_token.data());
57 void BufferedStackTrace::Unwind(u32 max_depth, uptr pc, uptr bp, void *context,
58 uptr stack_top, uptr stack_bottom,
59 bool request_fast_unwind) {
60 top_frame_bp = (max_depth > 0) ? bp : 0;
61 // Avoid doing any work for small max_depth.
71 if (!WillUseFastUnwind(request_fast_unwind)) {
72 #if SANITIZER_CAN_SLOW_UNWIND
74 SlowUnwindStackWithContext(pc, context, max_depth);
76 SlowUnwindStack(pc, max_depth);
78 UNREACHABLE("slow unwind requested but not available");
81 FastUnwindStack(pc, bp, stack_top, stack_bottom, max_depth);
85 } // namespace __sanitizer