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The first hunk corrects a bug when printing undef null values. We would print 

0->field, which is illegal.  Now we print ((foo*)0)->field.

The second hunk is an optimization to not print undefined phi values.

llvm-svn: 17094
This commit is contained in:
Chris Lattner 2004-10-17 17:48:59 +00:00
parent 068555314b
commit 621c413a1b
1 changed files with 11 additions and 6 deletions
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11
llvm/lib/Target/CBackend/Writer.cpp
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@ -523,7 +523,9 @@ void CWriter::printConstant(Constant *CPV) {
abort(); abort();
} }
} else if (isa<UndefValue>(CPV) && CPV->getType()->isFirstClassType()) { } else if (isa<UndefValue>(CPV) && CPV->getType()->isFirstClassType()) {
Out << "0"; Out << "((";
printType(Out, CPV->getType());
Out << ")/*UNDEF*/0)";
return; return;
} }
@ -1234,13 +1236,16 @@ void CWriter::printPHICopiesForSuccessors(BasicBlock *CurBlock,
SI != E; ++SI) SI != E; ++SI)
for (BasicBlock::iterator I = SI->begin(); isa<PHINode>(I); ++I) { for (BasicBlock::iterator I = SI->begin(); isa<PHINode>(I); ++I) {
PHINode *PN = cast<PHINode>(I); PHINode *PN = cast<PHINode>(I);
// now we have to do the printing // Now we have to do the printing.
Value *IV = PN->getIncomingValueForBlock(CurBlock);
if (!isa<UndefValue>(IV)) {
Out << std::string(Indent, ' '); Out << std::string(Indent, ' ');
Out << " " << Mang->getValueName(I) << "__PHI_TEMPORARY = "; Out << " " << Mang->getValueName(I) << "__PHI_TEMPORARY = ";
writeOperand(PN->getIncomingValue(PN->getBasicBlockIndex(CurBlock))); writeOperand(IV);
Out << "; /* for PHI node */\n"; Out << "; /* for PHI node */\n";
} }
} }
}
void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ, void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,