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[WinEH] Try to make the MachineFunction CFG more accurate

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This avoids emitting code for unreachable landingpad blocks that contain
calls to llvm.eh.actions and indirectbr.

It's also a first step towards unifying the SEH and WinEH lowering
codepaths. I'm keeping the old fan-in lowering of SEH around until the
preparation version works well enough that we can switch over without
breaking existing users.

llvm-svn: 235037
This commit is contained in:
Reid Kleckner
2015-04-15 18:48:15 +00:00
parent 9e7a8172a3
commit 3e9fadfbc8
4 changed files with 82 additions and 46 deletions
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7
llvm/lib/CodeGen/MachineModuleInfo.cpp
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@@ -570,10 +570,13 @@ const Function *MachineModuleInfo::getPersonality() const {
}
EHPersonality MachineModuleInfo::getPersonalityType() {
if (PersonalityTypeCache == EHPersonality::Unknown)
PersonalityTypeCache = classifyEHPersonality(getPersonality());
if (PersonalityTypeCache == EHPersonality::Unknown) {
if (const Function *F = getPersonality())
PersonalityTypeCache = classifyEHPersonality(F);
}
return PersonalityTypeCache;
}
/// getPersonalityIndex - Return unique index for current personality
/// function. NULL/first personality function should always get zero index.
unsigned MachineModuleInfo::getPersonalityIndex() const {