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Add support for unreachable and undef 

llvm-svn: 17048
This commit is contained in:
Chris Lattner 2004-10-16 18:12:13 +00:00
parent 81a7a23494
commit 583dfdcf86
1 changed files with 10 additions and 2 deletions
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12
llvm/lib/Target/CBackend/Writer.cpp
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@ -174,6 +174,7 @@ namespace {
void visitUnwindInst(UnwindInst &I) {
assert(0 && "Lowerinvoke pass didn't work!");
}
void visitUnreachableInst(UnreachableInst &I);
void visitPHINode(PHINode &I);
void visitBinaryOperator(Instruction &I);
@ -521,6 +522,9 @@ void CWriter::printConstant(Constant *CPV) {
<< *CE << "\n";
abort();
}
} else if (isa<UndefValue>(CPV) && CPV->getType()->isFirstClassType()) {
Out << "0";
return;
}
switch (CPV->getType()->getTypeID()) {
@ -606,7 +610,7 @@ void CWriter::printConstant(Constant *CPV) {
}
case Type::ArrayTyID:
if (isa<ConstantAggregateZero>(CPV)) {
if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
const ArrayType *AT = cast<ArrayType>(CPV->getType());
Out << "{";
if (AT->getNumElements()) {
@ -625,7 +629,7 @@ void CWriter::printConstant(Constant *CPV) {
break;
case Type::StructTyID:
if (isa<ConstantAggregateZero>(CPV)) {
if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
const StructType *ST = cast<StructType>(CPV->getType());
Out << "{";
if (ST->getNumElements()) {
@ -1205,6 +1209,10 @@ void CWriter::visitSwitchInst(SwitchInst &SI) {
Out << " }\n";
}
void CWriter::visitUnreachableInst(UnreachableInst &I) {
Out << " /*UNREACHABLE*/\n";
}
bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
/// FIXME: This should be reenabled, but loop reordering safe!!
return true;