[llvm-commits] [llvm] r69402 - /llvm/trunk/lib/Transforms/Utils/LowerInvoke.cpp
Jim Grosbach
grosbach at apple.com
Fri Apr 17 16:30:55 PDT 2009
Author: grosbach
Date: Fri Apr 17 18:30:55 2009
New Revision: 69402
URL: http://llvm.org/viewvc/llvm-project?rev=69402&view=rev
Log:
remove trailing whitespace
Modified:
llvm/trunk/lib/Transforms/Utils/LowerInvoke.cpp
Modified: llvm/trunk/lib/Transforms/Utils/LowerInvoke.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Utils/LowerInvoke.cpp?rev=69402&r1=69401&r2=69402&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Utils/LowerInvoke.cpp (original)
+++ llvm/trunk/lib/Transforms/Utils/LowerInvoke.cpp Fri Apr 17 18:30:55 2009
@@ -71,24 +71,24 @@
const Type *JBLinkTy;
GlobalVariable *JBListHead;
Constant *SetJmpFn, *LongJmpFn;
-
+
// We peek in TLI to grab the target's jmp_buf size and alignment
const TargetLowering *TLI;
-
+
public:
static char ID; // Pass identification, replacement for typeid
explicit LowerInvoke(const TargetLowering *tli = NULL)
: FunctionPass(&ID), TLI(tli) { }
bool doInitialization(Module &M);
bool runOnFunction(Function &F);
-
+
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
// This is a cluster of orthogonal Transforms
AU.addPreservedID(PromoteMemoryToRegisterID);
AU.addPreservedID(LowerSwitchID);
AU.addPreservedID(LowerAllocationsID);
}
-
+
private:
void createAbortMessage(Module *M);
void writeAbortMessage(Instruction *IB);
@@ -107,8 +107,8 @@
const PassInfo *const llvm::LowerInvokePassID = &X;
// Public Interface To the LowerInvoke pass.
-FunctionPass *llvm::createLowerInvokePass(const TargetLowering *TLI) {
- return new LowerInvoke(TLI);
+FunctionPass *llvm::createLowerInvokePass(const TargetLowering *TLI) {
+ return new LowerInvoke(TLI);
}
// doInitialization - Make sure that there is a prototype for abort in the
@@ -144,7 +144,7 @@
"llvm.sjljeh.jblist", &M);
}
-// VisualStudio defines setjmp as _setjmp via #include <csetjmp> / <setjmp.h>,
+// VisualStudio defines setjmp as _setjmp via #include <csetjmp> / <setjmp.h>,
// so it looks like Intrinsic::_setjmp
#if defined(_MSC_VER) && defined(setjmp)
#define setjmp_undefined_for_visual_studio
@@ -154,9 +154,9 @@
SetJmpFn = Intrinsic::getDeclaration(&M, Intrinsic::setjmp);
#if defined(_MSC_VER) && defined(setjmp_undefined_for_visual_studio)
-// let's return it to _setjmp state in case anyone ever needs it after this
+// let's return it to _setjmp state in case anyone ever needs it after this
// point under VisualStudio
-#define setjmp _setjmp
+#define setjmp _setjmp
#endif
LongJmpFn = Intrinsic::getDeclaration(&M, Intrinsic::longjmp);
@@ -270,25 +270,25 @@
// If the unwind edge has phi nodes, split the edge.
if (isa<PHINode>(II->getUnwindDest()->begin())) {
SplitCriticalEdge(II, 1, this);
-
+
// If there are any phi nodes left, they must have a single predecessor.
while (PHINode *PN = dyn_cast<PHINode>(II->getUnwindDest()->begin())) {
PN->replaceAllUsesWith(PN->getIncomingValue(0));
PN->eraseFromParent();
}
}
-
+
// Insert a store of the invoke num before the invoke and store zero into the
// location afterward.
new StoreInst(InvokeNoC, InvokeNum, true, II); // volatile
-
+
BasicBlock::iterator NI = II->getNormalDest()->getFirstNonPHI();
// nonvolatile.
new StoreInst(Constant::getNullValue(Type::Int32Ty), InvokeNum, false, NI);
-
+
// Add a switch case to our unwind block.
CatchSwitch->addCase(InvokeNoC, II->getUnwindDest());
-
+
// Insert a normal call instruction.
std::vector<Value*> CallArgs(II->op_begin()+3, II->op_end());
CallInst *NewCall = CallInst::Create(II->getCalledValue(),
@@ -298,7 +298,7 @@
NewCall->setCallingConv(II->getCallingConv());
NewCall->setAttributes(II->getAttributes());
II->replaceAllUsesWith(NewCall);
-
+
// Replace the invoke with an uncond branch.
BranchInst::Create(II->getNormalDest(), NewCall->getParent());
II->eraseFromParent();
@@ -308,9 +308,9 @@
/// we reach blocks we've already seen.
static void MarkBlocksLiveIn(BasicBlock *BB, std::set<BasicBlock*> &LiveBBs) {
if (!LiveBBs.insert(BB).second) return; // already been here.
-
+
for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
- MarkBlocksLiveIn(*PI, LiveBBs);
+ MarkBlocksLiveIn(*PI, LiveBBs);
}
// First thing we need to do is scan the whole function for values that are
@@ -331,7 +331,7 @@
}
Function *F = Invokes.back()->getParent()->getParent();
-
+
// To avoid having to handle incoming arguments specially, we lower each arg
// to a copy instruction in the entry block. This ensures that the argument
// value itself cannot be live across the entry block.
@@ -350,9 +350,9 @@
// could cause the opcode to reflect an illegal conversion. However, we're
// replacing it here with the same value it was constructed with to simply
// make NC its user.
- NC->setOperand(0, AI);
+ NC->setOperand(0, AI);
}
-
+
// Finally, scan the code looking for instructions with bad live ranges.
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
for (BasicBlock::iterator II = BB->begin(), E = BB->end(); II != E; ++II) {
@@ -364,13 +364,13 @@
if (Inst->hasOneUse() &&
cast<Instruction>(Inst->use_back())->getParent() == BB &&
!isa<PHINode>(Inst->use_back())) continue;
-
+
// If this is an alloca in the entry block, it's not a real register
// value.
if (AllocaInst *AI = dyn_cast<AllocaInst>(Inst))
if (isa<ConstantInt>(AI->getArraySize()) && BB == F->begin())
continue;
-
+
// Avoid iterator invalidation by copying users to a temporary vector.
std::vector<Instruction*> Users;
for (Value::use_iterator UI = Inst->use_begin(), E = Inst->use_end();
@@ -391,7 +391,7 @@
while (!Users.empty()) {
Instruction *U = Users.back();
Users.pop_back();
-
+
if (!isa<PHINode>(U)) {
MarkBlocksLiveIn(U->getParent(), LiveBBs);
} else {
@@ -402,7 +402,7 @@
MarkBlocksLiveIn(PN->getIncomingBlock(i), LiveBBs);
}
}
-
+
// Now that we know all of the blocks that this thing is live in, see if
// it includes any of the unwind locations.
bool NeedsSpill = false;
@@ -441,7 +441,7 @@
NumInvokes += Invokes.size();
NumUnwinds += Unwinds.size();
-
+
// TODO: This is not an optimal way to do this. In particular, this always
// inserts setjmp calls into the entries of functions with invoke instructions
// even though there are possibly paths through the function that do not
@@ -460,17 +460,17 @@
// we spill into a stack location, guaranteeing that there is nothing live
// across the unwind edge. This process also splits all critical edges
// coming out of invoke's.
- splitLiveRangesLiveAcrossInvokes(Invokes);
-
+ splitLiveRangesLiveAcrossInvokes(Invokes);
+
BasicBlock *EntryBB = F.begin();
-
+
// Create an alloca for the incoming jump buffer ptr and the new jump buffer
// that needs to be restored on all exits from the function. This is an
// alloca because the value needs to be live across invokes.
unsigned Align = TLI ? TLI->getJumpBufAlignment() : 0;
- AllocaInst *JmpBuf =
+ AllocaInst *JmpBuf =
new AllocaInst(JBLinkTy, 0, Align, "jblink", F.begin()->begin());
-
+
std::vector<Value*> Idx;
Idx.push_back(Constant::getNullValue(Type::Int32Ty));
Idx.push_back(ConstantInt::get(Type::Int32Ty, 1));
@@ -481,33 +481,33 @@
Value *OldBuf = new LoadInst(JBListHead, "oldjmpbufptr", true,
EntryBB->getTerminator());
new StoreInst(OldBuf, OldJmpBufPtr, true, EntryBB->getTerminator());
-
+
// Add the new jumpbuf to the list.
new StoreInst(JmpBuf, JBListHead, true, EntryBB->getTerminator());
// Create the catch block. The catch block is basically a big switch
// statement that goes to all of the invoke catch blocks.
BasicBlock *CatchBB = BasicBlock::Create("setjmp.catch", &F);
-
+
// Create an alloca which keeps track of which invoke is currently
// executing. For normal calls it contains zero.
AllocaInst *InvokeNum = new AllocaInst(Type::Int32Ty, 0, "invokenum",
EntryBB->begin());
new StoreInst(ConstantInt::get(Type::Int32Ty, 0), InvokeNum, true,
EntryBB->getTerminator());
-
+
// Insert a load in the Catch block, and a switch on its value. By default,
// we go to a block that just does an unwind (which is the correct action
// for a standard call).
BasicBlock *UnwindBB = BasicBlock::Create("unwindbb", &F);
Unwinds.push_back(new UnwindInst(UnwindBB));
-
+
Value *CatchLoad = new LoadInst(InvokeNum, "invoke.num", true, CatchBB);
SwitchInst *CatchSwitch =
SwitchInst::Create(CatchLoad, UnwindBB, Invokes.size(), CatchBB);
// Now that things are set up, insert the setjmp call itself.
-
+
// Split the entry block to insert the conditional branch for the setjmp.
BasicBlock *ContBlock = EntryBB->splitBasicBlock(EntryBB->getTerminator(),
"setjmp.cont");
@@ -522,12 +522,12 @@
EntryBB->getTerminator());
// Compare the return value to zero.
- Value *IsNormal = new ICmpInst(ICmpInst::ICMP_EQ, SJRet,
+ Value *IsNormal = new ICmpInst(ICmpInst::ICMP_EQ, SJRet,
Constant::getNullValue(SJRet->getType()),
"notunwind", EntryBB->getTerminator());
// Nuke the uncond branch.
EntryBB->getTerminator()->eraseFromParent();
-
+
// Put in a new condbranch in its place.
BranchInst::Create(ContBlock, CatchBB, IsNormal, EntryBB);
@@ -537,7 +537,7 @@
}
// We know that there is at least one unwind.
-
+
// Create three new blocks, the block to load the jmpbuf ptr and compare
// against null, the block to do the longjmp, and the error block for if it
// is null. Add them at the end of the function because they are not hot.
@@ -554,13 +554,13 @@
} else {
BufPtr = new LoadInst(JBListHead, "ehlist", UnwindHandler);
}
-
+
// Load the JBList, if it's null, then there was no catch!
- Value *NotNull = new ICmpInst(ICmpInst::ICMP_NE, BufPtr,
+ Value *NotNull = new ICmpInst(ICmpInst::ICMP_NE, BufPtr,
Constant::getNullValue(BufPtr->getType()),
"notnull", UnwindHandler);
BranchInst::Create(UnwindBlock, TermBlock, NotNull, UnwindHandler);
-
+
// Create the block to do the longjmp.
// Get a pointer to the jmpbuf and longjmp.
std::vector<Value*> Idx;
@@ -573,36 +573,36 @@
Idx[1] = ConstantInt::get(Type::Int32Ty, 1);
CallInst::Create(LongJmpFn, Idx.begin(), Idx.end(), "", UnwindBlock);
new UnreachableInst(UnwindBlock);
-
+
// Set up the term block ("throw without a catch").
new UnreachableInst(TermBlock);
// Insert a new call to write(2, AbortMessage, AbortMessageLength);
writeAbortMessage(TermBlock->getTerminator());
-
+
// Insert a call to abort()
CallInst::Create(AbortFn, "",
TermBlock->getTerminator())->setTailCall();
-
-
+
+
// Replace all unwinds with a branch to the unwind handler.
for (unsigned i = 0, e = Unwinds.size(); i != e; ++i) {
BranchInst::Create(UnwindHandler, Unwinds[i]);
- Unwinds[i]->eraseFromParent();
- }
-
+ Unwinds[i]->eraseFromParent();
+ }
+
// Finally, for any returns from this function, if this function contains an
// invoke, restore the old jmpbuf pointer to its input value.
if (OldJmpBufPtr) {
for (unsigned i = 0, e = Returns.size(); i != e; ++i) {
ReturnInst *R = Returns[i];
-
+
// Before the return, insert a copy from the saved value to the new value.
Value *OldBuf = new LoadInst(OldJmpBufPtr, "oldjmpbufptr", true, R);
new StoreInst(OldBuf, JBListHead, true, R);
}
}
-
+
return true;
}
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