forked from OSchip/llvm-project
108 lines
3.6 KiB
C++
108 lines
3.6 KiB
C++
//===-- sanitizer_stacktrace_libcdep.cc -----------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is shared between AddressSanitizer and ThreadSanitizer
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// run-time libraries.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common.h"
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#include "sanitizer_placement_new.h"
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#include "sanitizer_stacktrace.h"
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#include "sanitizer_stacktrace_printer.h"
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#include "sanitizer_symbolizer.h"
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namespace __sanitizer {
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void StackTrace::Print() const {
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if (trace == nullptr || size == 0) {
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Printf(" <empty stack>\n\n");
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return;
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}
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InternalScopedString frame_desc(GetPageSizeCached() * 2);
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InternalScopedString dedup_token(GetPageSizeCached());
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int dedup_frames = common_flags()->dedup_token_length;
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uptr frame_num = 0;
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for (uptr i = 0; i < size && trace[i]; i++) {
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// PCs in stack traces are actually the return addresses, that is,
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// addresses of the next instructions after the call.
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uptr pc = GetPreviousInstructionPc(trace[i]);
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SymbolizedStack *frames = Symbolizer::GetOrInit()->SymbolizePC(pc);
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CHECK(frames);
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for (SymbolizedStack *cur = frames; cur; cur = cur->next) {
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frame_desc.clear();
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RenderFrame(&frame_desc, common_flags()->stack_trace_format, frame_num++,
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cur->info, common_flags()->symbolize_vs_style,
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common_flags()->strip_path_prefix);
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Printf("%s\n", frame_desc.data());
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if (dedup_frames-- > 0) {
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if (dedup_token.length())
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dedup_token.append("--");
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dedup_token.append(cur->info.function);
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}
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}
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frames->ClearAll();
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}
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// Always print a trailing empty line after stack trace.
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Printf("\n");
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if (dedup_token.length())
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Printf("DEDUP_TOKEN: %s\n", dedup_token.data());
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}
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void BufferedStackTrace::Unwind(u32 max_depth, uptr pc, uptr bp, void *context,
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uptr stack_top, uptr stack_bottom,
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bool request_fast_unwind) {
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top_frame_bp = (max_depth > 0) ? bp : 0;
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// Avoid doing any work for small max_depth.
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if (max_depth == 0) {
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size = 0;
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return;
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}
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if (max_depth == 1) {
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size = 1;
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trace_buffer[0] = pc;
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return;
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}
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if (!WillUseFastUnwind(request_fast_unwind)) {
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#if SANITIZER_CAN_SLOW_UNWIND
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if (context)
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SlowUnwindStackWithContext(pc, context, max_depth);
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else
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SlowUnwindStack(pc, max_depth);
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#else
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UNREACHABLE("slow unwind requested but not available");
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#endif
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} else {
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FastUnwindStack(pc, bp, stack_top, stack_bottom, max_depth);
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}
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}
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} // namespace __sanitizer
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extern "C" {
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SANITIZER_INTERFACE_ATTRIBUTE
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void __sanitizer_symbolize_pc(uptr pc, const char *fmt, char *out_buf,
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uptr out_buf_size) {
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if (!out_buf_size) return;
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using namespace __sanitizer;
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pc = StackTrace::GetPreviousInstructionPc(pc);
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SymbolizedStack *frame = Symbolizer::GetOrInit()->SymbolizePC(pc);
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if (!frame) {
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internal_strncpy(out_buf, "<can't symbolize>", out_buf_size);
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out_buf[out_buf_size - 1] = 0;
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return;
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}
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InternalScopedString frame_desc(GetPageSizeCached());
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RenderFrame(&frame_desc, fmt, 0, frame->info,
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common_flags()->symbolize_vs_style,
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common_flags()->strip_path_prefix);
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internal_strncpy(out_buf, frame_desc.data(), out_buf_size);
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out_buf[out_buf_size - 1] = 0;
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}
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} // extern "C"
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