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-rw-r--r--lib/Analysis/AliasSetTracker.cpp33
-rw-r--r--lib/Analysis/CaptureTracking.cpp7
-rw-r--r--lib/Analysis/IPA/Andersens.cpp3
-rw-r--r--lib/Analysis/IPA/GlobalsModRef.cpp4
-rw-r--r--lib/Analysis/InlineCost.cpp4
-rw-r--r--lib/Analysis/InstCount.cpp4
-rw-r--r--lib/Analysis/MallocHelper.cpp9
-rw-r--r--lib/Analysis/MemoryDependenceAnalysis.cpp13
-rw-r--r--lib/AsmParser/LLLexer.cpp5
-rw-r--r--lib/Bitcode/Writer/BitcodeWriter.cpp5
-rw-r--r--lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp20
-rw-r--r--lib/CodeGen/SelectionDAG/SelectionDAGBuild.h2
-rw-r--r--lib/ExecutionEngine/Interpreter/Execution.cpp8
-rw-r--r--lib/ExecutionEngine/Interpreter/Interpreter.h1
-rw-r--r--lib/Target/CBackend/CBackend.cpp6
-rw-r--r--lib/Target/CppBackend/CPPBackend.cpp5
-rw-r--r--lib/Target/MSIL/MSILWriter.cpp4
-rw-r--r--lib/Transforms/Scalar/DeadStoreElimination.cpp7
-rw-r--r--lib/Transforms/Scalar/InstructionCombining.cpp57
-rw-r--r--lib/Transforms/Scalar/SCCP.cpp1
-rw-r--r--lib/Transforms/Utils/CMakeLists.txt1
-rw-r--r--lib/Transforms/Utils/Local.cpp5
-rw-r--r--lib/Transforms/Utils/LowerAllocations.cpp116
-rw-r--r--lib/Transforms/Utils/LowerInvoke.cpp1
-rw-r--r--lib/Transforms/Utils/LowerSwitch.cpp1
-rw-r--r--lib/Transforms/Utils/Mem2Reg.cpp1
-rw-r--r--lib/VMCore/Core.cpp3
-rw-r--r--lib/VMCore/Instruction.cpp48
-rw-r--r--lib/VMCore/Instructions.cpp32
29 files changed, 92 insertions, 314 deletions
diff --git a/lib/Analysis/AliasSetTracker.cpp b/lib/Analysis/AliasSetTracker.cpp
index 081f478..5b1b7d1 100644
--- a/lib/Analysis/AliasSetTracker.cpp
+++ b/lib/Analysis/AliasSetTracker.cpp
@@ -13,6 +13,7 @@
#include "llvm/Analysis/AliasSetTracker.h"
#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Analysis/MallocHelper.h"
#include "llvm/Instructions.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Pass.h"
@@ -296,12 +297,6 @@ bool AliasSetTracker::add(StoreInst *SI) {
return NewPtr;
}
-bool AliasSetTracker::add(FreeInst *FI) {
- bool NewPtr;
- addPointer(FI->getOperand(0), ~0, AliasSet::Mods, NewPtr);
- return NewPtr;
-}
-
bool AliasSetTracker::add(VAArgInst *VAAI) {
bool NewPtr;
addPointer(VAAI->getOperand(0), ~0, AliasSet::ModRef, NewPtr);
@@ -310,6 +305,13 @@ bool AliasSetTracker::add(VAArgInst *VAAI) {
bool AliasSetTracker::add(CallSite CS) {
+ Instruction* Inst = CS.getInstruction();
+ if (isFreeCall(Inst)) {
+ bool NewPtr;
+ addPointer(Inst->getOperand(1), ~0, AliasSet::Mods, NewPtr);
+ return NewPtr;
+ }
+
if (isa<DbgInfoIntrinsic>(CS.getInstruction()))
return true; // Ignore DbgInfo Intrinsics.
if (AA.doesNotAccessMemory(CS))
@@ -337,8 +339,6 @@ bool AliasSetTracker::add(Instruction *I) {
return add(CI);
else if (InvokeInst *II = dyn_cast<InvokeInst>(I))
return add(II);
- else if (FreeInst *FI = dyn_cast<FreeInst>(I))
- return add(FI);
else if (VAArgInst *VAAI = dyn_cast<VAArgInst>(I))
return add(VAAI);
return true;
@@ -427,13 +427,6 @@ bool AliasSetTracker::remove(StoreInst *SI) {
return true;
}
-bool AliasSetTracker::remove(FreeInst *FI) {
- AliasSet *AS = findAliasSetForPointer(FI->getOperand(0), ~0);
- if (!AS) return false;
- remove(*AS);
- return true;
-}
-
bool AliasSetTracker::remove(VAArgInst *VAAI) {
AliasSet *AS = findAliasSetForPointer(VAAI->getOperand(0), ~0);
if (!AS) return false;
@@ -442,6 +435,14 @@ bool AliasSetTracker::remove(VAArgInst *VAAI) {
}
bool AliasSetTracker::remove(CallSite CS) {
+ Instruction* Inst = CS.getInstruction();
+ if (isFreeCall(Inst)) {
+ AliasSet *AS = findAliasSetForPointer(Inst->getOperand(1), ~0);
+ if (!AS) return false;
+ remove(*AS);
+ return true;
+ }
+
if (AA.doesNotAccessMemory(CS))
return false; // doesn't alias anything
@@ -459,8 +460,6 @@ bool AliasSetTracker::remove(Instruction *I) {
return remove(SI);
else if (CallInst *CI = dyn_cast<CallInst>(I))
return remove(CI);
- else if (FreeInst *FI = dyn_cast<FreeInst>(I))
- return remove(FI);
else if (VAArgInst *VAAI = dyn_cast<VAArgInst>(I))
return remove(VAAI);
return true;
diff --git a/lib/Analysis/CaptureTracking.cpp b/lib/Analysis/CaptureTracking.cpp
index b30ac71..649b760 100644
--- a/lib/Analysis/CaptureTracking.cpp
+++ b/lib/Analysis/CaptureTracking.cpp
@@ -17,6 +17,7 @@
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/CaptureTracking.h"
+#include "llvm/Analysis/MallocHelper.h"
#include "llvm/Instructions.h"
#include "llvm/Value.h"
#include "llvm/ADT/SmallSet.h"
@@ -48,6 +49,9 @@ bool llvm::PointerMayBeCaptured(const Value *V, bool ReturnCaptures) {
switch (I->getOpcode()) {
case Instruction::Call:
+ if (isFreeCall(I))
+ // Freeing a pointer does not cause it to be captured.
+ break;
case Instruction::Invoke: {
CallSite CS = CallSite::get(I);
// Not captured if the callee is readonly, doesn't return a copy through
@@ -73,9 +77,6 @@ bool llvm::PointerMayBeCaptured(const Value *V, bool ReturnCaptures) {
// captured.
break;
}
- case Instruction::Free:
- // Freeing a pointer does not cause it to be captured.
- break;
case Instruction::Load:
// Loading from a pointer does not cause it to be captured.
break;
diff --git a/lib/Analysis/IPA/Andersens.cpp b/lib/Analysis/IPA/Andersens.cpp
index 6372342..78ec06f 100644
--- a/lib/Analysis/IPA/Andersens.cpp
+++ b/lib/Analysis/IPA/Andersens.cpp
@@ -1016,7 +1016,7 @@ bool Andersens::AnalyzeUsesOfFunction(Value *V) {
}
} else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(*UI)) {
if (AnalyzeUsesOfFunction(GEP)) return true;
- } else if (isa<FreeInst>(*UI) || isFreeCall(*UI)) {
+ } else if (isFreeCall(*UI)) {
return false;
} else if (CallInst *CI = dyn_cast<CallInst>(*UI)) {
// Make sure that this is just the function being called, not that it is
@@ -1156,7 +1156,6 @@ void Andersens::visitInstruction(Instruction &I) {
case Instruction::Switch:
case Instruction::Unwind:
case Instruction::Unreachable:
- case Instruction::Free:
case Instruction::ICmp:
case Instruction::FCmp:
return;
diff --git a/lib/Analysis/IPA/GlobalsModRef.cpp b/lib/Analysis/IPA/GlobalsModRef.cpp
index 01090f1..011b0ef 100644
--- a/lib/Analysis/IPA/GlobalsModRef.cpp
+++ b/lib/Analysis/IPA/GlobalsModRef.cpp
@@ -238,7 +238,7 @@ bool GlobalsModRef::AnalyzeUsesOfPointer(Value *V,
} else if (BitCastInst *BCI = dyn_cast<BitCastInst>(*UI)) {
if (AnalyzeUsesOfPointer(BCI, Readers, Writers, OkayStoreDest))
return true;
- } else if (isa<FreeInst>(*UI) || isFreeCall(*UI)) {
+ } else if (isFreeCall(*UI)) {
Writers.push_back(cast<Instruction>(*UI)->getParent()->getParent());
} else if (CallInst *CI = dyn_cast<CallInst>(*UI)) {
// Make sure that this is just the function being called, not that it is
@@ -437,7 +437,7 @@ void GlobalsModRef::AnalyzeCallGraph(CallGraph &CG, Module &M) {
if (cast<StoreInst>(*II).isVolatile())
// Treat volatile stores as reading memory somewhere.
FunctionEffect |= Ref;
- } else if (isMalloc(&cast<Instruction>(*II)) || isa<FreeInst>(*II) ||
+ } else if (isMalloc(&cast<Instruction>(*II)) ||
isFreeCall(&cast<Instruction>(*II))) {
FunctionEffect |= ModRef;
}
diff --git a/lib/Analysis/InlineCost.cpp b/lib/Analysis/InlineCost.cpp
index 4f010b6..febdd91 100644
--- a/lib/Analysis/InlineCost.cpp
+++ b/lib/Analysis/InlineCost.cpp
@@ -130,10 +130,6 @@ void CodeMetrics::analyzeBasicBlock(const BasicBlock *BB) {
NumInsts += InlineConstants::CallPenalty;
}
- // These, too, are calls.
- if (isa<FreeInst>(II))
- NumInsts += InlineConstants::CallPenalty;
-
if (const AllocaInst *AI = dyn_cast<AllocaInst>(II)) {
if (!AI->isStaticAlloca())
this->usesDynamicAlloca = true;
diff --git a/lib/Analysis/InstCount.cpp b/lib/Analysis/InstCount.cpp
index c4f3b68..a4b041f 100644
--- a/lib/Analysis/InstCount.cpp
+++ b/lib/Analysis/InstCount.cpp
@@ -74,11 +74,11 @@ FunctionPass *llvm::createInstCountPass() { return new InstCount(); }
bool InstCount::runOnFunction(Function &F) {
unsigned StartMemInsts =
NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
- NumInvokeInst + NumAllocaInst + NumFreeInst;
+ NumInvokeInst + NumAllocaInst;
visit(F);
unsigned EndMemInsts =
NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
- NumInvokeInst + NumAllocaInst + NumFreeInst;
+ NumInvokeInst + NumAllocaInst;
TotalMemInst += EndMemInsts-StartMemInsts;
return false;
}
diff --git a/lib/Analysis/MallocHelper.cpp b/lib/Analysis/MallocHelper.cpp
index 511de9d..70afa88 100644
--- a/lib/Analysis/MallocHelper.cpp
+++ b/lib/Analysis/MallocHelper.cpp
@@ -1,4 +1,4 @@
-//===-- MallocHelper.cpp - Functions to identify malloc calls -------------===//
+//===-- MallocFreeHelper.cpp - Identify calls to malloc and free builtins -===//
//
// The LLVM Compiler Infrastructure
//
@@ -8,7 +8,8 @@
//===----------------------------------------------------------------------===//
//
// This family of functions identifies calls to malloc, bitcasts of malloc
-// calls, and the types and array sizes associated with them.
+// calls, and the types and array sizes associated with them. It also
+// identifies calls to the free builtin.
//
//===----------------------------------------------------------------------===//
@@ -264,6 +265,10 @@ Value* llvm::getMallocArraySize(CallInst* CI, LLVMContext &Context,
return BO->getOperand(0);
}
+//===----------------------------------------------------------------------===//
+// free Call Utility Functions.
+//
+
/// isFreeCall - Returns true if the the value is a call to the builtin free()
bool llvm::isFreeCall(const Value* I) {
const CallInst *CI = dyn_cast<CallInst>(I);
diff --git a/lib/Analysis/MemoryDependenceAnalysis.cpp b/lib/Analysis/MemoryDependenceAnalysis.cpp
index ce76740..7b3fe64 100644
--- a/lib/Analysis/MemoryDependenceAnalysis.cpp
+++ b/lib/Analysis/MemoryDependenceAnalysis.cpp
@@ -113,10 +113,9 @@ getCallSiteDependencyFrom(CallSite CS, bool isReadOnlyCall,
} else if (VAArgInst *V = dyn_cast<VAArgInst>(Inst)) {
Pointer = V->getOperand(0);
PointerSize = AA->getTypeStoreSize(V->getType());
- } else if (FreeInst *F = dyn_cast<FreeInst>(Inst)) {
- Pointer = F->getPointerOperand();
-
- // FreeInsts erase the entire structure
+ } else if (isFreeCall(Inst)) {
+ Pointer = Inst->getOperand(1);
+ // calls to free() erase the entire structure
PointerSize = ~0ULL;
} else if (isFreeCall(Inst)) {
Pointer = Inst->getOperand(0);
@@ -319,7 +318,7 @@ MemDepResult MemoryDependenceAnalysis::getDependency(Instruction *QueryInst) {
MemSize = AA->getTypeStoreSize(LI->getType());
}
} else if (isFreeCall(QueryInst)) {
- MemPtr = QueryInst->getOperand(0);
+ MemPtr = QueryInst->getOperand(1);
// calls to free() erase the entire structure, not just a field.
MemSize = ~0UL;
} else if (isa<CallInst>(QueryInst) || isa<InvokeInst>(QueryInst)) {
@@ -327,10 +326,6 @@ MemDepResult MemoryDependenceAnalysis::getDependency(Instruction *QueryInst) {
bool isReadOnly = AA->onlyReadsMemory(QueryCS);
LocalCache = getCallSiteDependencyFrom(QueryCS, isReadOnly, ScanPos,
QueryParent);
- } else if (FreeInst *FI = dyn_cast<FreeInst>(QueryInst)) {
- MemPtr = FI->getPointerOperand();
- // FreeInsts erase the entire structure, not just a field.
- MemSize = ~0UL;
} else {
// Non-memory instruction.
LocalCache = MemDepResult::getClobber(--BasicBlock::iterator(ScanPos));
diff --git a/lib/AsmParser/LLLexer.cpp b/lib/AsmParser/LLLexer.cpp
index f6cea88..4fb7ea9 100644
--- a/lib/AsmParser/LLLexer.cpp
+++ b/lib/AsmParser/LLLexer.cpp
@@ -606,6 +606,10 @@ lltok::Kind LLLexer::LexIdentifier() {
// FIXME: Remove in LLVM 3.0.
// Autoupgrade malloc instruction.
return lltok::kw_malloc;
+ } else if (Len == 4 && !memcmp(StartChar, "free", 4)) {
+ // FIXME: Remove in LLVM 3.0.
+ // Autoupgrade malloc instruction.
+ return lltok::kw_free;
}
// Keywords for instructions.
@@ -646,7 +650,6 @@ lltok::Kind LLLexer::LexIdentifier() {
INSTKEYWORD(unreachable, Unreachable);
INSTKEYWORD(alloca, Alloca);
- INSTKEYWORD(free, Free);
INSTKEYWORD(load, Load);
INSTKEYWORD(store, Store);
INSTKEYWORD(getelementptr, GetElementPtr);
diff --git a/lib/Bitcode/Writer/BitcodeWriter.cpp b/lib/Bitcode/Writer/BitcodeWriter.cpp
index 037854e..535740b 100644
--- a/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -1054,11 +1054,6 @@ static void WriteInstruction(const Instruction &I, unsigned InstID,
Vals.push_back(VE.getValueID(I.getOperand(i)));
break;
- case Instruction::Free:
- Code = bitc::FUNC_CODE_INST_FREE;
- PushValueAndType(I.getOperand(0), InstID, Vals, VE);
- break;
-
case Instruction::Alloca:
Code = bitc::FUNC_CODE_INST_ALLOCA;
Vals.push_back(VE.getTypeID(I.getType()));
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
index d862e40..f3a0622 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
@@ -5486,26 +5486,6 @@ void SelectionDAGLowering::visitInlineAsm(CallSite CS) {
DAG.setRoot(Chain);
}
-void SelectionDAGLowering::visitFree(FreeInst &I) {
- TargetLowering::ArgListTy Args;
- TargetLowering::ArgListEntry Entry;
- Entry.Node = getValue(I.getOperand(0));
- Entry.Ty = TLI.getTargetData()->getIntPtrType(*DAG.getContext());
- Args.push_back(Entry);
- EVT IntPtr = TLI.getPointerTy();
- bool isTailCall = PerformTailCallOpt &&
- isInTailCallPosition(&I, Attribute::None, TLI);
- std::pair<SDValue,SDValue> Result =
- TLI.LowerCallTo(getRoot(), Type::getVoidTy(*DAG.getContext()),
- false, false, false, false,
- 0, CallingConv::C, isTailCall,
- /*isReturnValueUsed=*/true,
- DAG.getExternalSymbol("free", IntPtr), Args, DAG,
- getCurDebugLoc());
- if (Result.second.getNode())
- DAG.setRoot(Result.second);
-}
-
void SelectionDAGLowering::visitVAStart(CallInst &I) {
DAG.setRoot(DAG.getNode(ISD::VASTART, getCurDebugLoc(),
MVT::Other, getRoot(),
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.h b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.h
index 722b1d8..7470551 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.h
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.h
@@ -44,7 +44,6 @@ class FPExtInst;
class FPToSIInst;
class FPToUIInst;
class FPTruncInst;
-class FreeInst;
class Function;
class GetElementPtrInst;
class GCFunctionInfo;
@@ -528,7 +527,6 @@ private:
void visitGetElementPtr(User &I);
void visitSelect(User &I);
- void visitFree(FreeInst &I);
void visitAlloca(AllocaInst &I);
void visitLoad(LoadInst &I);
void visitStore(StoreInst &I);
diff --git a/lib/ExecutionEngine/Interpreter/Execution.cpp b/lib/ExecutionEngine/Interpreter/Execution.cpp
index 151bd00..7ceb8e8 100644
--- a/lib/ExecutionEngine/Interpreter/Execution.cpp
+++ b/lib/ExecutionEngine/Interpreter/Execution.cpp
@@ -749,14 +749,6 @@ void Interpreter::visitAllocaInst(AllocaInst &I) {
ECStack.back().Allocas.add(Memory);
}
-void Interpreter::visitFreeInst(FreeInst &I) {
- ExecutionContext &SF = ECStack.back();
- assert(isa<PointerType>(I.getOperand(0)->getType()) && "Freeing nonptr?");
- GenericValue Value = getOperandValue(I.getOperand(0), SF);
- // TODO: Check to make sure memory is allocated
- free(GVTOP(Value)); // Free memory
-}
-
// getElementOffset - The workhorse for getelementptr.
//
GenericValue Interpreter::executeGEPOperation(Value *Ptr, gep_type_iterator I,
diff --git a/lib/ExecutionEngine/Interpreter/Interpreter.h b/lib/ExecutionEngine/Interpreter/Interpreter.h
index 43c18d0..eaa8ec5 100644
--- a/lib/ExecutionEngine/Interpreter/Interpreter.h
+++ b/lib/ExecutionEngine/Interpreter/Interpreter.h
@@ -140,7 +140,6 @@ public:
void visitICmpInst(ICmpInst &I);
void visitFCmpInst(FCmpInst &I);
void visitAllocaInst(AllocaInst &I);
- void visitFreeInst(FreeInst &I);
void visitLoadInst(LoadInst &I);
void visitStoreInst(StoreInst &I);
void visitGetElementPtrInst(GetElementPtrInst &I);
diff --git a/lib/Target/CBackend/CBackend.cpp b/lib/Target/CBackend/CBackend.cpp
index 27ed5c3..fb61651 100644
--- a/lib/Target/CBackend/CBackend.cpp
+++ b/lib/Target/CBackend/CBackend.cpp
@@ -303,7 +303,6 @@ namespace {
bool visitBuiltinCall(CallInst &I, Intrinsic::ID ID, bool &WroteCallee);
void visitAllocaInst(AllocaInst &I);
- void visitFreeInst (FreeInst &I);
void visitLoadInst (LoadInst &I);
void visitStoreInst (StoreInst &I);
void visitGetElementPtrInst(GetElementPtrInst &I);
@@ -3417,10 +3416,6 @@ void CWriter::visitAllocaInst(AllocaInst &I) {
Out << ')';
}
-void CWriter::visitFreeInst(FreeInst &I) {
- llvm_unreachable("lowerallocations pass didn't work!");
-}
-
void CWriter::printGEPExpression(Value *Ptr, gep_type_iterator I,
gep_type_iterator E, bool Static) {
@@ -3685,7 +3680,6 @@ bool CTargetMachine::addPassesToEmitWholeFile(PassManager &PM,
if (FileType != TargetMachine::AssemblyFile) return true;
PM.add(createGCLoweringPass());
- PM.add(createLowerAllocationsPass());
PM.add(createLowerInvokePass());
PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
diff --git a/lib/Target/CppBackend/CPPBackend.cpp b/lib/Target/CppBackend/CPPBackend.cpp
index 45c2a7b..9a6aa63 100644
--- a/lib/Target/CppBackend/CPPBackend.cpp
+++ b/lib/Target/CppBackend/CPPBackend.cpp
@@ -1258,11 +1258,6 @@ namespace {
Out << "\");";
break;
}
- case Instruction::Free: {
- Out << "FreeInst* " << iName << " = new FreeInst("
- << getCppName(I->getOperand(0)) << ", " << bbname << ");";
- break;
- }
case Instruction::Alloca: {
const AllocaInst* allocaI = cast<AllocaInst>(I);
Out << "AllocaInst* " << iName << " = new AllocaInst("
diff --git a/lib/Target/MSIL/MSILWriter.cpp b/lib/Target/MSIL/MSILWriter.cpp
index 5899ab3..f12ee78 100644
--- a/lib/Target/MSIL/MSILWriter.cpp
+++ b/lib/Target/MSIL/MSILWriter.cpp
@@ -1191,9 +1191,6 @@ void MSILWriter::printInstruction(const Instruction* Inst) {
case Instruction::Alloca:
printAllocaInstruction(cast<AllocaInst>(Inst));
break;
- case Instruction::Free:
- llvm_unreachable("LowerAllocationsPass used");
- break;
case Instruction::Unreachable:
printSimpleInstruction("ldstr", "\"Unreachable instruction\"");
printSimpleInstruction("newobj",
@@ -1699,7 +1696,6 @@ bool MSILTarget::addPassesToEmitWholeFile(PassManager &PM,
if (FileType != TargetMachine::AssemblyFile) return true;
MSILWriter* Writer = new MSILWriter(o);
PM.add(createGCLoweringPass());
- PM.add(createLowerAllocationsPass());
// FIXME: Handle switch trougth native IL instruction "switch"
PM.add(createLowerSwitchPass());
PM.add(createCFGSimplificationPass());
diff --git a/lib/Transforms/Scalar/DeadStoreElimination.cpp b/lib/Transforms/Scalar/DeadStoreElimination.cpp
index f55d8b2..c10d236 100644
--- a/lib/Transforms/Scalar/DeadStoreElimination.cpp
+++ b/lib/Transforms/Scalar/DeadStoreElimination.cpp
@@ -89,7 +89,7 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
Instruction *Inst = BBI++;
// If we find a store or a free, get its memory dependence.
- if (!isa<StoreInst>(Inst) && !isa<FreeInst>(Inst) && !isFreeCall(Inst))
+ if (!isa<StoreInst>(Inst) && !isFreeCall(Inst))
continue;
// Don't molest volatile stores or do queries that will return "clobber".
@@ -104,7 +104,7 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
if (InstDep.isNonLocal()) continue;
// Handle frees whose dependencies are non-trivial.
- if (isa<FreeInst>(Inst) || isFreeCall(Inst)) {
+ if (isFreeCall(Inst)) {
MadeChange |= handleFreeWithNonTrivialDependency(Inst, InstDep);
continue;
}
@@ -176,8 +176,7 @@ bool DSE::handleFreeWithNonTrivialDependency(Instruction *F, MemDepResult Dep) {
Value *DepPointer = Dependency->getPointerOperand()->getUnderlyingObject();
// Check for aliasing.
- Value* FreeVal = isa<FreeInst>(F) ? F->getOperand(0) : F->getOperand(1);
- if (AA.alias(FreeVal, 1, DepPointer, 1) !=
+ if (AA.alias(F->getOperand(1), 1, DepPointer, 1) !=
AliasAnalysis::MustAlias)
return false;
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 7c0d223..fa84bb5 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -285,7 +285,6 @@ namespace {
Instruction *visitPHINode(PHINode &PN);
Instruction *visitGetElementPtrInst(GetElementPtrInst &GEP);
Instruction *visitAllocaInst(AllocaInst &AI);
- Instruction *visitFreeInst(FreeInst &FI);
Instruction *visitFree(Instruction &FI);
Instruction *visitLoadInst(LoadInst &LI);
Instruction *visitStoreInst(StoreInst &SI);
@@ -11328,56 +11327,6 @@ Instruction *InstCombiner::visitAllocaInst(AllocaInst &AI) {
return 0;
}
-Instruction *InstCombiner::visitFreeInst(FreeInst &FI) {
- Value *Op = FI.getOperand(0);
-
- // free undef -> unreachable.
- if (isa<UndefValue>(Op)) {
- // Insert a new store to null because we cannot modify the CFG here.
- new StoreInst(ConstantInt::getTrue(*Context),
- UndefValue::get(Type::getInt1PtrTy(*Context)), &FI);
- return EraseInstFromFunction(FI);
- }
-
- // If we have 'free null' delete the instruction. This can happen in stl code
- // when lots of inlining happens.
- if (isa<ConstantPointerNull>(Op))
- return EraseInstFromFunction(FI);
-
- // Change free <ty>* (cast <ty2>* X to <ty>*) into free <ty2>* X
- if (BitCastInst *CI = dyn_cast<BitCastInst>(Op)) {
- FI.setOperand(0, CI->getOperand(0));
- return &FI;
- }
-
- // Change free (gep X, 0,0,0,0) into free(X)
- if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(Op)) {
- if (GEPI->hasAllZeroIndices()) {
- Worklist.Add(GEPI);
- FI.setOperand(0, GEPI->getOperand(0));
- return &FI;
- }
- }
-
- if (isMalloc(Op)) {
- if (CallInst* CI = extractMallocCallFromBitCast(Op)) {
- if (Op->hasOneUse() && CI->hasOneUse()) {
- EraseInstFromFunction(FI);
- EraseInstFromFunction(*CI);
- return EraseInstFromFunction(*cast<Instruction>(Op));
- }
- } else {
- // Op is a call to malloc
- if (Op->hasOneUse()) {
- EraseInstFromFunction(FI);
- return EraseInstFromFunction(*cast<Instruction>(Op));
- }
- }
- }
-
- return 0;
-}
-
Instruction *InstCombiner::visitFree(Instruction &FI) {
Value *Op = FI.getOperand(1);
@@ -11394,9 +11343,8 @@ Instruction *InstCombiner::visitFree(Instruction &FI) {
if (isa<ConstantPointerNull>(Op))
return EraseInstFromFunction(FI);
- // FIXME: Bring back free (gep X, 0,0,0,0) into free(X) transform
-
- if (isMalloc(Op)) {
+ // If we have a malloc call whose only use is a free call, delete both.
+ if (isMalloc(Op))
if (CallInst* CI = extractMallocCallFromBitCast(Op)) {
if (Op->hasOneUse() && CI->hasOneUse()) {
EraseInstFromFunction(FI);
@@ -11410,7 +11358,6 @@ Instruction *InstCombiner::visitFree(Instruction &FI) {
return EraseInstFromFunction(*cast<Instruction>(Op));
}
}
- }
return 0;
}
diff --git a/lib/Transforms/Scalar/SCCP.cpp b/lib/Transforms/Scalar/SCCP.cpp
index 1bb5f4a..4c56121 100644
--- a/lib/Transforms/Scalar/SCCP.cpp
+++ b/lib/Transforms/Scalar/SCCP.cpp
@@ -416,7 +416,6 @@ private:
void visitAllocaInst (Instruction &I) { markOverdefined(&I); }
void visitVANextInst (Instruction &I) { markOverdefined(&I); }
void visitVAArgInst (Instruction &I) { markOverdefined(&I); }
- void visitFreeInst (Instruction &I) { /*returns void*/ }
void visitInstruction(Instruction &I) {
// If a new instruction is added to LLVM that we don't handle...
diff --git a/lib/Transforms/Utils/CMakeLists.txt b/lib/Transforms/Utils/CMakeLists.txt
index f4394ea..fbc61d7 100644
--- a/lib/Transforms/Utils/CMakeLists.txt
+++ b/lib/Transforms/Utils/CMakeLists.txt
@@ -13,7 +13,6 @@ add_llvm_library(LLVMTransformUtils
LCSSA.cpp
Local.cpp
LoopSimplify.cpp
- LowerAllocations.cpp
LowerInvoke.cpp
LowerSwitch.cpp
Mem2Reg.cpp
diff --git a/lib/Transforms/Utils/Local.cpp b/lib/Transforms/Utils/Local.cpp
index 940f5a9..6e18b66 100644
--- a/lib/Transforms/Utils/Local.cpp
+++ b/lib/Transforms/Utils/Local.cpp
@@ -60,9 +60,8 @@ bool llvm::isSafeToLoadUnconditionally(Value *V, Instruction *ScanFrom) {
// If we see a free or a call which may write to memory (i.e. which might do
// a free) the pointer could be marked invalid.
- if (isa<FreeInst>(BBI) || isFreeCall(BBI) ||
- (isa<CallInst>(BBI) && BBI->mayWriteToMemory() &&
- !isa<DbgInfoIntrinsic>(BBI)))
+ if (isFreeCall(BBI) || (isa<CallInst>(BBI) && BBI->mayWriteToMemory() &&
+ !isa<DbgInfoIntrinsic>(BBI)))
return false;
if (LoadInst *LI = dyn_cast<LoadInst>(BBI)) {
diff --git a/lib/Transforms/Utils/LowerAllocations.cpp b/lib/Transforms/Utils/LowerAllocations.cpp
deleted file mode 100644
index 5f7bf4c..0000000
--- a/lib/Transforms/Utils/LowerAllocations.cpp
+++ /dev/null
@@ -1,116 +0,0 @@
-//===- LowerAllocations.cpp - Reduce free insts to calls ------------------===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// The LowerAllocations transformation is a target-dependent tranformation
-// because it depends on the size of data types and alignment constraints.
-//
-//===----------------------------------------------------------------------===//
-
-#define DEBUG_TYPE "lowerallocs"
-#include "llvm/Transforms/Scalar.h"
-#include "llvm/Transforms/Utils/UnifyFunctionExitNodes.h"
-#include "llvm/Module.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/Instructions.h"
-#include "llvm/Constants.h"
-#include "llvm/LLVMContext.h"
-#include "llvm/Pass.h"
-#include "llvm/ADT/Statistic.h"
-#include "llvm/Target/TargetData.h"
-using namespace llvm;
-
-STATISTIC(NumLowered, "Number of allocations lowered");
-
-namespace {
- /// LowerAllocations - Turn free instructions into @free calls.
- ///
- class LowerAllocations : public BasicBlockPass {
- Constant *FreeFunc; // Functions in the module we are processing
- // Initialized by doInitialization
- public:
- static char ID; // Pass ID, replacement for typeid
- explicit LowerAllocations()
- : BasicBlockPass(&ID), FreeFunc(0) {}
-
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
- AU.addRequired<TargetData>();
- AU.setPreservesCFG();
-
- // This is a cluster of orthogonal Transforms:
- AU.addPreserved<UnifyFunctionExitNodes>();
- AU.addPreservedID(PromoteMemoryToRegisterID);
- AU.addPreservedID(LowerSwitchID);
- AU.addPreservedID(LowerInvokePassID);
- }
-
- /// doPassInitialization - For the lower allocations pass, this ensures that
- /// a module contains a declaration for a free function.
- ///
- bool doInitialization(Module &M);
-
- virtual bool doInitialization(Function &F) {
- return doInitialization(*F.getParent());
- }
-
- /// runOnBasicBlock - This method does the actual work of converting
- /// instructions over, assuming that the pass has already been initialized.
- ///
- bool runOnBasicBlock(BasicBlock &BB);
- };
-}
-
-char LowerAllocations::ID = 0;
-static RegisterPass<LowerAllocations>
-X("lowerallocs", "Lower allocations from instructions to calls");
-
-// Publically exposed interface to pass...
-const PassInfo *const llvm::LowerAllocationsID = &X;
-// createLowerAllocationsPass - Interface to this file...
-Pass *llvm::createLowerAllocationsPass() {
- return new LowerAllocations();
-}
-
-
-// doInitialization - For the lower allocations pass, this ensures that a
-// module contains a declaration for a free function.
-//
-// This function is always successful.
-//
-bool LowerAllocations::doInitialization(Module &M) {
- const Type *BPTy = Type::getInt8PtrTy(M.getContext());
- FreeFunc = M.getOrInsertFunction("free" , Type::getVoidTy(M.getContext()),
- BPTy, (Type *)0);
- return true;
-}
-
-// runOnBasicBlock - This method does the actual work of converting
-// instructions over, assuming that the pass has already been initialized.
-//
-bool LowerAllocations::runOnBasicBlock(BasicBlock &BB) {
- bool Changed = false;
- assert(FreeFunc && "Pass not initialized!");
-
- BasicBlock::InstListType &BBIL = BB.getInstList();
-
- // Loop over all of the instructions, looking for free instructions
- for (BasicBlock::iterator I = BB.begin(), E = BB.end(); I != E; ++I) {
- if (FreeInst *FI = dyn_cast<FreeInst>(I)) {
- // Insert a call to the free function...
- CallInst::CreateFree(FI->getOperand(0), I);
-
- // Delete the old free instruction
- I = --BBIL.erase(I);
- Changed = true;
- ++NumLowered;
- }
- }
-
- return Changed;
-}
-
diff --git a/lib/Transforms/Utils/LowerInvoke.cpp b/lib/Transforms/Utils/LowerInvoke.cpp
index abb7414..6e6e8d2 100644
--- a/lib/Transforms/Utils/LowerInvoke.cpp
+++ b/lib/Transforms/Utils/LowerInvoke.cpp
@@ -86,7 +86,6 @@ namespace {
// This is a cluster of orthogonal Transforms
AU.addPreservedID(PromoteMemoryToRegisterID);
AU.addPreservedID(LowerSwitchID);
- AU.addPreservedID(LowerAllocationsID);
}
private:
diff --git a/lib/Transforms/Utils/LowerSwitch.cpp b/lib/Transforms/Utils/LowerSwitch.cpp
index bc1779f..8c18b59 100644
--- a/lib/Transforms/Utils/LowerSwitch.cpp
+++ b/lib/Transforms/Utils/LowerSwitch.cpp
@@ -43,7 +43,6 @@ namespace {
AU.addPreserved<UnifyFunctionExitNodes>();
AU.addPreservedID(PromoteMemoryToRegisterID);
AU.addPreservedID(LowerInvokePassID);
- AU.addPreservedID(LowerAllocationsID);
}
struct CaseRange {
diff --git a/lib/Transforms/Utils/Mem2Reg.cpp b/lib/Transforms/Utils/Mem2Reg.cpp
index baa7d9e..9416604 100644
--- a/lib/Transforms/Utils/Mem2Reg.cpp
+++ b/lib/Transforms/Utils/Mem2Reg.cpp
@@ -44,7 +44,6 @@ namespace {
AU.addPreserved<UnifyFunctionExitNodes>();
AU.addPreservedID(LowerSwitchID);
AU.addPreservedID(LowerInvokePassID);
- AU.addPreservedID(LowerAllocationsID);
}
};
} // end of anonymous namespace
diff --git a/lib/VMCore/Core.cpp b/lib/VMCore/Core.cpp
index a28037d..9a49d42 100644
--- a/lib/VMCore/Core.cpp
+++ b/lib/VMCore/Core.cpp
@@ -1724,7 +1724,8 @@ LLVMValueRef LLVMBuildArrayAlloca(LLVMBuilderRef B, LLVMTypeRef Ty,
}
LLVMValueRef LLVMBuildFree(LLVMBuilderRef B, LLVMValueRef PointerVal) {
- return wrap(unwrap(B)->CreateFree(unwrap(PointerVal)));
+ return wrap(unwrap(B)->Insert(
+ CallInst::CreateFree(unwrap(PointerVal), unwrap(B)->GetInsertBlock())));
}
diff --git a/lib/VMCore/Instruction.cpp b/lib/VMCore/Instruction.cpp
index 3839dda..391ba7b 100644
--- a/lib/VMCore/Instruction.cpp
+++ b/lib/VMCore/Instruction.cpp
@@ -127,7 +127,6 @@ const char *Instruction::getOpcodeName(unsigned OpCode) {
case Xor: return "xor";
// Memory instructions...
- case Free: return "free";
case Alloca: return "alloca";
case Load: return "load";
case Store: return "store";
@@ -303,16 +302,43 @@ bool Instruction::isUsedOutsideOfBlock(const BasicBlock *BB) const {
return false;
}
+// Code here matches isFreeCall from MallocHelper, which is not in VMCore.
+static bool isFreeCall(const Value* I) {
+ const CallInst *CI = dyn_cast<CallInst>(I);
+ if (!CI)
+ return false;
+
+ const Module* M = CI->getParent()->getParent()->getParent();
+ Function *FreeFunc = M->getFunction("free");
+
+ if (CI->getOperand(0) != FreeFunc)
+ return false;
+
+ // Check free prototype.
+ // FIXME: workaround for PR5130, this will be obsolete when a nobuiltin
+ // attribute will exist.
+ const FunctionType *FTy = FreeFunc->getFunctionType();
+ if (FTy->getReturnType() != Type::getVoidTy(M->getContext()))
+ return false;
+ if (FTy->getNumParams() != 1)
+ return false;
+ if (FTy->param_begin()->get() != Type::getInt8PtrTy(M->getContext()))
+ return false;
+
+ return true;
+}
+
/// mayReadFromMemory - Return true if this instruction may read memory.
///
bool Instruction::mayReadFromMemory() const {
switch (getOpcode()) {
default: return false;
- case Instruction::Free:
case Instruction::VAArg:
case Instruction::Load:
return true;
case Instruction::Call:
+ if (isFreeCall(this))
+ return true;
return !cast<CallInst>(this)->doesNotAccessMemory();
case Instruction::Invoke:
return !cast<InvokeInst>(this)->doesNotAccessMemory();
@@ -326,11 +352,12 @@ bool Instruction::mayReadFromMemory() const {
bool Instruction::mayWriteToMemory() const {
switch (getOpcode()) {
default: return false;
- case Instruction::Free:
case Instruction::Store:
case Instruction::VAArg:
return true;
case Instruction::Call:
+ if (isFreeCall(this))
+ return true;
return !cast<CallInst>(this)->onlyReadsMemory();
case Instruction::Invoke:
return !cast<InvokeInst>(this)->onlyReadsMemory();
@@ -398,7 +425,19 @@ static bool isMalloc(const Value* I) {
if (CI->getOperand(0) != MallocFunc)
return false;
- return true;
+ // Check malloc prototype.
+ // FIXME: workaround for PR5130, this will be obsolete when a nobuiltin
+ // attribute will exist.
+ const FunctionType *FTy = cast<Function>(MallocFunc)->getFunctionType();
+ if (FTy->getNumParams() != 1)
+ return false;
+ if (IntegerType *ITy = dyn_cast<IntegerType>(FTy->param_begin()->get())) {
+ if (ITy->getBitWidth() != 32 && ITy->getBitWidth() != 64)
+ return false;
+ return true;
+ }
+
+ return false;
}
bool Instruction::isSafeToSpeculativelyExecute() const {
@@ -444,7 +483,6 @@ bool Instruction::isSafeToSpeculativelyExecute() const {
case Invoke:
case PHI:
case Store:
- case Free:
case Ret:
case Br:
case Switch:
diff --git a/lib/VMCore/Instructions.cpp b/lib/VMCore/Instructions.cpp
index c926547..02d5af0 100644
--- a/lib/VMCore/Instructions.cpp
+++ b/lib/VMCore/Instructions.cpp
@@ -985,28 +985,6 @@ bool AllocaInst::isStaticAlloca() const {
}
//===----------------------------------------------------------------------===//
-// FreeInst Implementation
-//===----------------------------------------------------------------------===//
-
-void FreeInst::AssertOK() {
- assert(isa<PointerType>(getOperand(0)->getType()) &&
- "Can not free something of nonpointer type!");
-}
-
-FreeInst::FreeInst(Value *Ptr, Instruction *InsertBefore)
- : UnaryInstruction(Type::getVoidTy(Ptr->getContext()),
- Free, Ptr, InsertBefore) {
- AssertOK();
-}
-
-FreeInst::FreeInst(Value *Ptr, BasicBlock *InsertAtEnd)
- : UnaryInstruction(Type::getVoidTy(Ptr->getContext()),
- Free, Ptr, InsertAtEnd) {
- AssertOK();
-}
-
-
-//===----------------------------------------------------------------------===//
// LoadInst Implementation
//===----------------------------------------------------------------------===//
@@ -3181,16 +3159,6 @@ AllocaInst *AllocaInst::clone() const {
return New;
}
-FreeInst *FreeInst::clone() const {
- FreeInst *New = new FreeInst(getOperand(0));
- New->SubclassOptionalData = SubclassOptionalData;
- if (hasMetadata()) {
- LLVMContext &Context = getContext();
- Context.pImpl->TheMetadata.ValueIsCloned(this, New);
- }
- return New;
-}
-
LoadInst *LoadInst::clone() const {
LoadInst *New = new LoadInst(getOperand(0),
Twine(), isVolatile(),
generated by cgit v1.1 at 2025-02-09 19:10:05 +0000