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Reverting dtor devirtualization patch.

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_sabre_: it has a major problem: by the time ~Value is run, all of the "parts" of the derived classes have been destroyed
_sabre_: the vtable lives to fight another day

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44760 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Gordon Henriksen
2007-12-10 02:14:30 +00:00
parent 65b211807d
commit afba8fe662
21 changed files with 228 additions and 663 deletions
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38
lib/VMCore/BasicBlock.cpp
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@@ -30,9 +30,31 @@ ilist_traits<Instruction>::getSymTab(BasicBlock *BB) {
return 0;
}
DummyInst::DummyInst() : Instruction(Type::VoidTy, OtherOpsEnd, 0, 0) {
// This should not be garbage monitored.
LeakDetector::removeGarbageObject(this);
namespace {
/// DummyInst - An instance of this class is used to mark the end of the
/// instruction list. This is not a real instruction.
struct VISIBILITY_HIDDEN DummyInst : public Instruction {
DummyInst() : Instruction(Type::VoidTy, OtherOpsEnd, 0, 0) {
// This should not be garbage monitored.
LeakDetector::removeGarbageObject(this);
}
Instruction *clone() const {
assert(0 && "Cannot clone EOL");abort();
return 0;
}
const char *getOpcodeName() const { return "*end-of-list-inst*"; }
// Methods for support type inquiry through isa, cast, and dyn_cast...
static inline bool classof(const DummyInst *) { return true; }
static inline bool classof(const Instruction *I) {
return I->getOpcode() == OtherOpsEnd;
}
static inline bool classof(const Value *V) {
return isa<Instruction>(V) && classof(cast<Instruction>(V));
}
};
}
Instruction *ilist_traits<Instruction>::createSentinel() {
@@ -66,12 +88,10 @@ BasicBlock::BasicBlock(const std::string &Name, Function *NewParent,
}
void BasicBlock::destroyThis(BasicBlock*v)
{
assert(v->getParent() == 0 && "BasicBlock still linked into the program!");
v->dropAllReferences();
v->InstList.clear();
Value::destroyThis(v);
BasicBlock::~BasicBlock() {
assert(getParent() == 0 && "BasicBlock still linked into the program!");
dropAllReferences();
InstList.clear();
}
void BasicBlock::setParent(Function *parent) {