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Zero-Initialize PrevInstBB when entering a new MachineFunction.

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It is not guaranteed that the memory used for MachineBasicBlocks in
the previous MachineFunction hasn't been freed, so holding on to a
pointer to the last function's isn't correct. Particularly I have
observed the sret.ll testcase failing because the first BasicBlock in
the new function happened to be allocated to the exact same memory as
the previously saved and (deleted) PrevInstBB.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@298642 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adrian Prantl 2017-03-23 20:23:42 +00:00
parent a1c1557043
commit 5787d18e9c
1 changed files with 1 additions and 0 deletions
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lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
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@ -130,6 +130,7 @@ bool hasDebugInfo(const MachineModuleInfo *MMI, const MachineFunction *MF) {
void DebugHandlerBase::beginFunction(const MachineFunction *MF) {
assert(Asm);
PrevInstBB = nullptr;
if (!hasDebugInfo(MMI, MF)) {
skippedNonDebugFunction();