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[SEH] Reimplement x64 SEH using WinEHPrepare

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This now emits simple, unoptimized xdata tables for __C_specific_handler
based on the handlers listed in @llvm.eh.actions calls produced by
WinEHPrepare.

This adds support for running __finally blocks when exceptions are
thrown, and removes the old landingpad fan-in codepath.

I ran some manual execution tests on small basic test cases with and
without optimization, as well as on Chrome base_unittests, which uses a
small amount of SEH.  I'm sure there are bugs, and we may need to
revert.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235154 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner
2015-04-17 01:01:27 +00:00
parent 02916381eb
commit 9dea1d0d01
19 changed files with 419 additions and 355 deletions
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21
lib/CodeGen/MachineModuleInfo.cpp
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@@ -461,12 +461,23 @@ void MachineModuleInfo::addCleanup(MachineBasicBlock *LandingPad) {
LP.TypeIds.push_back(0);
}
MCSymbol *
MachineModuleInfo::addClauseForLandingPad(MachineBasicBlock *LandingPad) {
MCSymbol *ClauseLabel = Context.CreateTempSymbol();
void MachineModuleInfo::addSEHCatchHandler(MachineBasicBlock *LandingPad,
const Function *Filter,
const BlockAddress *RecoverBA) {
LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
LP.ClauseLabels.push_back(ClauseLabel);
return ClauseLabel;
SEHHandler Handler;
Handler.FilterOrFinally = Filter;
Handler.RecoverBA = RecoverBA;
LP.SEHHandlers.push_back(Handler);
}
void MachineModuleInfo::addSEHCleanupHandler(MachineBasicBlock *LandingPad,
const Function *Cleanup) {
LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
SEHHandler Handler;
Handler.FilterOrFinally = Cleanup;
Handler.RecoverBA = nullptr;
LP.SEHHandlers.push_back(Handler);
}
/// TidyLandingPads - Remap landing pad labels and remove any deleted landing