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Improve compatibility with programs that already have a prototype for 'write',

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even if it is wierd in some way.

llvm-svn: 11207
This commit is contained in:
Chris Lattner 2004-02-08 22:14:44 +00:00
parent a9a34f9d82
commit a9887d33e8
1 changed files with 43 additions and 12 deletions
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51
lib/Transforms/Scalar/LowerInvoke.cpp
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@ -60,6 +60,7 @@ namespace {
bool doInitialization(Module &M);
bool runOnFunction(Function &F);
private:
void writeAbortMessage(Instruction *IB);
bool insertCheapEHSupport(Function &F);
bool insertExpensiveEHSupport(Function &F);
};
@ -148,12 +149,49 @@ bool LowerInvoke::doInitialization(Module &M) {
}
// We need the 'write' and 'abort' functions for both models.
AbortFn = M.getOrInsertFunction("abort", Type::VoidTy, 0);
// Unfortunately, 'write' can end up being prototyped in several different
// ways. If the user defines a three (or more) operand function named 'write'
// we will used their prototype. We _do not_ want to insert another instance
// of a write prototype, because we don't know that the funcresolve pass will
// run after us. If there is a definition of a write function, but it's not
// suitable for our uses, we just don't emit write calls. If there is no
// write prototype at all, we just add one.
if (Function *WF = M.getNamedFunction("write")) {
if (WF->getFunctionType()->getNumParams() > 3 ||
WF->getFunctionType()->isVarArg())
WriteFn = WF;
else
WriteFn = 0;
} else {
WriteFn = M.getOrInsertFunction("write", Type::VoidTy, Type::IntTy,
VoidPtrTy, Type::IntTy, 0);
AbortFn = M.getOrInsertFunction("abort", Type::VoidTy, 0);
}
return true;
}
void LowerInvoke::writeAbortMessage(Instruction *IB) {
if (WriteFn) {
// These are the arguments we WANT...
std::vector<Value*> Args;
Args.push_back(ConstantInt::get(Type::IntTy, 2));
Args.push_back(AbortMessage);
Args.push_back(ConstantInt::get(Type::IntTy, AbortMessageLength));
// If the actual declaration of write disagrees, insert casts as
// appropriate.
const FunctionType *FT = WriteFn->getFunctionType();
unsigned NumArgs = FT->getNumParams();
for (unsigned i = 0; i != 3; ++i)
if (i < NumArgs && FT->getParamType(i) != Args[i]->getType())
Args[i] = ConstantExpr::getCast(cast<Constant>(Args[i]),
FT->getParamType(i));
new CallInst(WriteFn, Args, "", IB);
}
}
bool LowerInvoke::insertCheapEHSupport(Function &F) {
bool Changed = false;
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
@ -177,11 +215,7 @@ bool LowerInvoke::insertCheapEHSupport(Function &F) {
++NumLowered; Changed = true;
} else if (UnwindInst *UI = dyn_cast<UnwindInst>(BB->getTerminator())) {
// Insert a new call to write(2, AbortMessage, AbortMessageLength);
std::vector<Value*> Args;
Args.push_back(ConstantInt::get(Type::IntTy, 2));
Args.push_back(AbortMessage);
Args.push_back(ConstantInt::get(Type::IntTy, AbortMessageLength));
new CallInst(WriteFn, Args, "", UI);
writeAbortMessage(UI);
// Insert a call to abort()
new CallInst(AbortFn, std::vector<Value*>(), "", UI);
@ -331,10 +365,7 @@ bool LowerInvoke::insertExpensiveEHSupport(Function &F) {
RI = TermBlock->getTerminator();
// Insert a new call to write(2, AbortMessage, AbortMessageLength);
Idx[0] = ConstantInt::get(Type::IntTy, 2);
Idx[1] = AbortMessage;
Idx.push_back(ConstantInt::get(Type::IntTy, AbortMessageLength));
new CallInst(WriteFn, Idx, "", RI);
writeAbortMessage(RI);
// Insert a call to abort()
new CallInst(AbortFn, std::vector<Value*>(), "", RI);