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[sanstats] Print the correct line information.

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The instrumentation tracks the return address and not that of the
call so we remove one to compensate. Thanks for Peter Collingbourne
for confirming the analysis of the problem.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307871 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Davide Italiano
2017-07-13 00:49:03 +00:00
parent dd70def46c
commit b0e9b49e0d
3 changed files with 8 additions and 1 deletions
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BIN
test/tools/sanstats/Inputs/debuginfo.stats Normal file
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4
test/tools/sanstats/debuginfo.test Normal file
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@@ -0,0 +1,4 @@
# RUN: sanstats %p/Inputs/debuginfo.stats | FileCheck %s
# CHECK: stats.cpp:23 vcall.cfi cfi-vcall 37
# CHECK: stats.cpp:28 nvcall.cfi cfi-nvcall 51

5
tools/sanstats/sanstats.cpp
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@@ -76,8 +76,11 @@ const char *ReadModule(char SizeofPtr, const char *Begin, const char *End) {
if (Begin == End)
return nullptr;
// As the instrumentation tracks the return address and not
// the address of the call to `__sanitizer_stats_report` we
// remove one from the address to get the correct DI.
if (Expected<DILineInfo> LineInfo =
Symbolizer.symbolizeCode(Filename, Addr)) {
Symbolizer.symbolizeCode(Filename, Addr - 1)) {
llvm::outs() << LineInfo->FileName << ':' << LineInfo->Line << ' '
<< LineInfo->FunctionName << ' ';
} else {