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Lazily create the abort message, so only translation units that use unwind 

will actually get it.

llvm-svn: 17700
This commit is contained in:
Chris Lattner 2004-11-13 19:07:32 +00:00
parent 9b0291b18d
commit 2858e17538
1 changed files with 34 additions and 25 deletions
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59
llvm/lib/Transforms/Scalar/LowerInvoke.cpp
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@ -66,6 +66,7 @@ namespace {
bool doInitialization(Module &M);
bool runOnFunction(Function &F);
private:
void createAbortMessage();
void writeAbortMessage(Instruction *IB);
bool insertCheapEHSupport(Function &F);
bool insertExpensiveEHSupport(Function &F);
@ -119,31 +120,6 @@ bool LowerInvoke::doInitialization(Module &M) {
LongJmpFn = M.getOrInsertFunction("llvm.longjmp", Type::VoidTy,
PointerType::get(JmpBufTy),
Type::IntTy, 0);
// The abort message for expensive EH support tells the user that the
// program 'unwound' without an 'invoke' instruction.
Constant *Msg =
ConstantArray::get("ERROR: Exception thrown, but not caught!\n");
AbortMessageLength = Msg->getNumOperands()-1; // don't include \0
GlobalVariable *MsgGV = new GlobalVariable(Msg->getType(), true,
GlobalValue::InternalLinkage,
Msg, "abortmsg", &M);
std::vector<Constant*> GEPIdx(2, Constant::getNullValue(Type::LongTy));
AbortMessage = ConstantExpr::getGetElementPtr(MsgGV, GEPIdx);
} else {
// The abort message for cheap EH support tells the user that EH is not
// enabled.
Constant *Msg =
ConstantArray::get("Exception handler needed, but not enabled. Recompile"
" program with -enable-correct-eh-support.\n");
AbortMessageLength = Msg->getNumOperands()-1; // don't include \0
GlobalVariable *MsgGV = new GlobalVariable(Msg->getType(), true,
GlobalValue::InternalLinkage,
Msg, "abortmsg", &M);
std::vector<Constant*> GEPIdx(2, Constant::getNullValue(Type::LongTy));
AbortMessage = ConstantExpr::getGetElementPtr(MsgGV, GEPIdx);
}
// We need the 'write' and 'abort' functions for both models.
@ -169,8 +145,41 @@ bool LowerInvoke::doInitialization(Module &M) {
return true;
}
void LowerInvoke::createAbortMessage() {
Module &M = *WriteFn->getParent();
if (ExpensiveEHSupport) {
// The abort message for expensive EH support tells the user that the
// program 'unwound' without an 'invoke' instruction.
Constant *Msg =
ConstantArray::get("ERROR: Exception thrown, but not caught!\n");
AbortMessageLength = Msg->getNumOperands()-1; // don't include \0
GlobalVariable *MsgGV = new GlobalVariable(Msg->getType(), true,
GlobalValue::InternalLinkage,
Msg, "abortmsg", &M);
std::vector<Constant*> GEPIdx(2, Constant::getNullValue(Type::LongTy));
AbortMessage = ConstantExpr::getGetElementPtr(MsgGV, GEPIdx);
} else {
// The abort message for cheap EH support tells the user that EH is not
// enabled.
Constant *Msg =
ConstantArray::get("Exception handler needed, but not enabled. Recompile"
" program with -enable-correct-eh-support.\n");
AbortMessageLength = Msg->getNumOperands()-1; // don't include \0
GlobalVariable *MsgGV = new GlobalVariable(Msg->getType(), true,
GlobalValue::InternalLinkage,
Msg, "abortmsg", &M);
std::vector<Constant*> GEPIdx(2, Constant::getNullValue(Type::LongTy));
AbortMessage = ConstantExpr::getGetElementPtr(MsgGV, GEPIdx);
}
}
void LowerInvoke::writeAbortMessage(Instruction *IB) {
if (WriteFn) {
if (AbortMessage == 0) createAbortMessage();
// These are the arguments we WANT...
std::vector<Value*> Args;
Args.push_back(ConstantInt::get(Type::IntTy, 2));