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Add a call to 'write' right before the call to abort() in the unwind path.

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This causes the JIT, or LLC'd program to print out a nice message, explaining
WHY the program aborted.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11184 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-02-08 07:30:29 +00:00
parent 973e3ec7db
commit e1c09309f2
1 changed files with 27 additions and 3 deletions
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30
lib/Transforms/Utils/LowerInvoke.cpp
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@ -15,12 +15,12 @@
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Scalar.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/iTerminators.h"
#include "llvm/iOther.h"
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/Constant.h"
#include "Support/Statistic.h"
using namespace llvm;
@ -28,6 +28,9 @@ namespace {
Statistic<> NumLowered("lowerinvoke", "Number of invoke & unwinds replaced");
class LowerInvoke : public FunctionPass {
Value *AbortMessage;
unsigned AbortMessageLength;
Function *WriteFn;
Function *AbortFn;
public:
bool doInitialization(Module &M);
@ -44,7 +47,21 @@ FunctionPass *llvm::createLowerInvokePass() { return new LowerInvoke(); }
// doInitialization - Make sure that there is a prototype for abort in the
// current module.
bool LowerInvoke::doInitialization(Module &M) {
Constant *Msg =
ConstantArray::get("Exception handler needed, but not available.\n");
AbortMessageLength = Msg->getNumOperands()-1; // don't include \0
GlobalVariable *MsgGV =
new GlobalVariable(Msg->getType(), true, GlobalValue::InternalLinkage, Msg,
"", &M);
std::vector<Constant*> GEPIdx(2, Constant::getNullValue(Type::LongTy));
AbortMessage =
ConstantExpr::getGetElementPtr(ConstantPointerRef::get(MsgGV), GEPIdx);
AbortFn = M.getOrInsertFunction("abort", Type::VoidTy, 0);
WriteFn = M.getOrInsertFunction("write", Type::VoidTy, Type::IntTy,
PointerType::get(Type::SByteTy), Type::IntTy,
0);
return true;
}
@ -70,6 +87,13 @@ bool LowerInvoke::runOnFunction(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);
// Insert a call to abort()
new CallInst(AbortFn, std::vector<Value*>(), "", UI);