forked from OSchip/llvm-project
87 lines
2.3 KiB
C++
87 lines
2.3 KiB
C++
//===-- sanitizer_stacktrace.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_flags.h"
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#include "sanitizer_stacktrace.h"
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namespace __sanitizer {
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uptr StackTrace::GetPreviousInstructionPc(uptr pc) {
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#ifdef __arm__
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// Cancel Thumb bit.
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pc = pc & (~1);
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#endif
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#if defined(__sparc__)
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return pc - 8;
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#else
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return pc - 1;
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#endif
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}
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uptr StackTrace::GetCurrentPc() {
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return GET_CALLER_PC();
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}
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void StackTrace::FastUnwindStack(uptr pc, uptr bp,
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uptr stack_top, uptr stack_bottom,
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uptr 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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trace[0] = pc;
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size = 1;
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uptr *frame = (uptr *)bp;
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uptr *prev_frame = frame - 1;
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if (stack_top < 4096) return; // Sanity check for stack top.
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// Avoid infinite loop when frame == frame[0] by using frame > prev_frame.
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while (frame > prev_frame &&
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frame < (uptr *)stack_top - 2 &&
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frame > (uptr *)stack_bottom &&
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IsAligned((uptr)frame, sizeof(*frame)) &&
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size < max_depth) {
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uptr pc1 = frame[1];
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if (pc1 != pc) {
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trace[size++] = pc1;
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}
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prev_frame = frame;
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frame = (uptr*)frame[0];
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}
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}
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static bool MatchPc(uptr cur_pc, uptr trace_pc, uptr threshold) {
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return cur_pc - trace_pc <= threshold || trace_pc - cur_pc <= threshold;
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}
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void StackTrace::PopStackFrames(uptr count) {
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CHECK_LT(count, size);
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size -= count;
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for (uptr i = 0; i < size; ++i) {
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trace[i] = trace[i + count];
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}
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}
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uptr StackTrace::LocatePcInTrace(uptr pc) {
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// Use threshold to find PC in stack trace, as PC we want to unwind from may
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// slightly differ from return address in the actual unwinded stack trace.
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const int kPcThreshold = 192;
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for (uptr i = 0; i < size; ++i) {
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if (MatchPc(pc, trace[i], kPcThreshold))
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return i;
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}
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return 0;
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}
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} // namespace __sanitizer
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