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TestCase null_deref was failing in Win64:

Authored by etienneb on Jul 15 2016, 10:16 AM.

Description

TestCase null_deref was failing in Win64:

c:\lipo\work\asan\b_llvm>c:\lipo\work\asan\b_llvm\projects\compiler-rt\test\asan\X86_64WindowsConfig\TestCases\Output\null_deref.cc.tmp

5488==ERROR: AddressSanitizer: access-violation on unknown address 0x000000000028 (pc 0x7ff701f91067 bp 0x000c8cf8fbf0 sp 0x000c8cf8fbb0 T0)

5488==The signal is caused by a READ memory access.

5488==Hint: address points to the zero page.

#0 0x7ff701f91066 in NullDeref(int *) C:\lipo\work\asan\llvm\projects\compiler-rt\test\asan\TestCases\null_deref.cc:15:10
#1 0x8a0388830a67  (<unknown module>)

The reason was symbols was not initilized. In fact, it was first inited
with a call to stack.Print(), which calls
WinSymbolizerTool::SymbolizePC, then InitializeDbgHelpIfNeeded().

Since the StackWalk was performed before the stack.Print(), stack frames
where not gathered correctly.

There should be a better place to initialize symbols. For now, this
patch makes the test happy.

Patch by Wei Wang
Differential Revision: https://reviews.llvm.org/D22410

llvm-svn: 275580

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