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Make deleting and complete dtor variants defer to other dtor variants by

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calling them as subroutines.  This triggers whenever the alias optimization
doesn't, i.e. when the dtor has linkonce linkage or there are virtual bases
or it's the deleting dtor.

llvm-svn: 96605
This commit is contained in:
John McCall
2010-02-18 19:59:28 +00:00
parent 441eb781ae
commit 5c60a6f597
4 changed files with 133 additions and 56 deletions
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58
clang/lib/CodeGen/CodeGenFunction.cpp
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@@ -248,39 +248,69 @@ void CodeGenFunction::GenerateBody(GlobalDecl GD, llvm::Function *Fn,
Stmt *Body = FD->getBody();
assert((Body || FD->isImplicit()) && "non-implicit function def has no body");
bool SkipBody = false; // should get jump-threaded
// Emit special ctor/dtor prologues.
llvm::BasicBlock *DtorEpilogue = 0;
if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) {
// Emit the constructor prologue, i.e. the base and member initializers.
EmitCtorPrologue(CD, GD.getCtorType());
// TODO: for complete, non-varargs variants, we can get away with
// just emitting the vbase initializers, then calling the base
// constructor.
} else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(FD)) {
DtorEpilogue = createBasicBlock("dtor.epilogue");
// In all cases, if there's an exception in the body (or delegate)
// we'll still need to run the epilogue.
llvm::BasicBlock *DtorEpilogue = createBasicBlock("dtor.epilogue");
PushCleanupBlock(DtorEpilogue);
InitializeVtablePtrs(DD->getParent());
// If this is the deleting variant, invoke the complete variant;
// the epilogue will call the appropriate operator delete().
if (GD.getDtorType() == Dtor_Deleting) {
EmitCXXDestructorCall(DD, Dtor_Complete, LoadCXXThis());
SkipBody = true;
// If this is the complete variant, just invoke the base variant;
// the epilogue will destruct the virtual bases.
} else if (GD.getDtorType() == Dtor_Complete) {
EmitCXXDestructorCall(DD, Dtor_Base, LoadCXXThis());
SkipBody = true;
// Otherwise, we're in the base variant, so we need to ensure the
// vtable ptrs are right before emitting the body.
} else {
InitializeVtablePtrs(DD->getParent());
}
}
// Emit the body of the function.
if (!Body)
if (SkipBody) {
// skipped
} else if (!Body) {
SynthesizeImplicitFunctionBody(GD, Fn, Args);
else {
} else {
if (isa<CXXTryStmt>(Body))
OuterTryBlock = cast<CXXTryStmt>(Body);
EmitStmt(Body);
}
// Emit special ctor/ctor epilogues.
// Emit special ctor/dtor epilogues.
if (isa<CXXConstructorDecl>(FD)) {
// If any of the member initializers are temporaries bound to references
// make sure to emit their destructors.
// Be sure to emit any cleanup blocks associated with the member
// or base initializers, which includes (along the exceptional
// path) the destructors for those members and bases that were
// fully constructed.
EmitCleanupBlocks(0);
} else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(FD)) {
CleanupBlockInfo Info = PopCleanupBlock();
assert(Info.CleanupBlock == DtorEpilogue && "Block mismatch!");
EmitBlock(DtorEpilogue);
} else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(FD)) {
// Funnel the previously-pushed cleanup block into the epilogue.
CleanupBlockInfo Info = PopCleanupBlock();
EmitBlock(Info.CleanupBlock);
EmitDtorEpilogue(DD, GD.getDtorType());
// Go ahead and link in the switch and end blocks.
if (Info.SwitchBlock)
EmitBlock(Info.SwitchBlock);
if (Info.EndBlock)