[compiler-rt] r196809 - Unbreak build by adding an implementation of PopStackFrames function.

[Chandler Carruth]

Bill, you should also pull this patch into the 3.4 branch to fix the build
after the prior commit I asked to be merged.


On Mon, Dec 9, 2013 at 11:52 AM, Richard Smith
<richard-llvm at metafoo.co.uk>wrote:

> Author: rsmith
> Date: Mon Dec  9 13:52:39 2013
> New Revision: 196809
>
> URL: http://llvm.org/viewvc/llvm-project?rev=196809&view=rev
> Log:
> Unbreak build by adding an implementation of PopStackFrames function.
>
> Modified:
>     compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace.cc
>     compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace.h
>
> Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace.cc
> URL:
> http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace.cc?rev=196809&r1=196808&r2=196809&view=diff
>
> ==============================================================================
> --- compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace.cc
> (original)
> +++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace.cc Mon Dec
>  9 13:52:39 2013
> @@ -147,6 +147,14 @@ static bool MatchPc(uptr cur_pc, uptr tr
>    return cur_pc - trace_pc <= threshold || trace_pc - cur_pc <= threshold;
>  }
>
> +void StackTrace::PopStackFrames(uptr count) {
> +  CHECK(count < size);
> +  size -= count;
> +  for (uptr i = 0; i < size; ++i) {
> +    trace[i] = trace[i + count];
> +  }
> +}
> +
>  uptr StackTrace::LocatePcInTrace(uptr pc) {
>    // 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.
>
> Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace.h
> URL:
> http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace.h?rev=196809&r1=196808&r2=196809&view=diff
>
> ==============================================================================
> --- compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace.h
> (original)
> +++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace.h Mon Dec
>  9 13:52:39 2013
> @@ -68,6 +68,7 @@ struct StackTrace {
>    void FastUnwindStack(uptr pc, uptr bp, uptr stack_top, uptr
> stack_bottom,
>                         uptr max_depth);
>    void SlowUnwindStack(uptr pc, uptr max_depth);
> +  void PopStackFrames(uptr count);
>    uptr LocatePcInTrace(uptr pc);
>  };
>
>
>
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