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[Sanitizer] Use same PC threshold in slow unwinder on all platforms 

llvm-svn: 194580
This commit is contained in:
Alexey Samsonov 2013-11-13 15:20:10 +00:00
parent 9ff4598225
commit cf6ac12e23
3 changed files with 7 additions and 4 deletions
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2
compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cc
View File

@ -161,7 +161,7 @@ void StackTrace::SlowUnwindStack(uptr pc, uptr max_depth) {
UnwindTraceArg arg = {this, Min(max_depth + 1, kStackTraceMax)};
_Unwind_Backtrace(Unwind_Trace, &arg);
// We need to pop a few frames so that pc is on top.
uptr to_pop = LocatePcInTrace(pc, 64, 6);
uptr to_pop = LocatePcInTrace(pc, 6);
// trace[0] belongs to the current function so we always pop it.
if (to_pop == 0)
to_pop = 1;

7
compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.cc
View File

@ -152,9 +152,12 @@ static bool MatchPc(uptr cur_pc, uptr trace_pc, uptr threshold) {
}
uptr
StackTrace::LocatePcInTrace(uptr pc, uptr pc_threshold, uptr max_pc_depth) {
StackTrace::LocatePcInTrace(uptr pc, uptr max_pc_depth) {
// Use threshold to find PC in stack trace, as PC we want to unwind from may
// slightly differ from return address in the actual unwinded stack trace.
const int kPcThreshold = 64;
for (uptr i = 0; i < max_pc_depth && i < size; ++i) {
if (MatchPc(pc, trace[i], pc_threshold))
if (MatchPc(pc, trace[i], kPcThreshold))
return i;
}
return 0;

2
compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.h
View File

@ -69,7 +69,7 @@ struct StackTrace {
uptr max_depth);
void SlowUnwindStack(uptr pc, uptr max_depth);
void PopStackFrames(uptr count);
uptr LocatePcInTrace(uptr pc, uptr pc_threshold = 0, uptr max_pc_depth = -1);
uptr LocatePcInTrace(uptr pc, uptr max_pc_depth = -1);
};
} // namespace __sanitizer