//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//
//===----------------------------------------------------------------------===//
+#include "LLVMContextImpl.h"
#include "llvm/Type.h"
#include "llvm/Instructions.h"
#include "llvm/Function.h"
+#include "llvm/Constants.h"
+#include "llvm/GlobalVariable.h"
+#include "llvm/Module.h"
+#include "llvm/Support/CallSite.h"
#include "llvm/Support/LeakDetector.h"
using namespace llvm;
Instruction::Instruction(const Type *ty, unsigned it, Use *Ops, unsigned NumOps,
- const std::string &Name, Instruction *InsertBefore)
+ Instruction *InsertBefore)
: User(ty, Value::InstructionVal + it, Ops, NumOps), Parent(0) {
// Make sure that we get added to a basicblock
LeakDetector::addGarbageObject(this);
"Instruction to insert before is not in a basic block!");
InsertBefore->getParent()->getInstList().insert(InsertBefore, this);
}
- setName(Name);
}
Instruction::Instruction(const Type *ty, unsigned it, Use *Ops, unsigned NumOps,
- const std::string &Name, BasicBlock *InsertAtEnd)
+ BasicBlock *InsertAtEnd)
: User(ty, Value::InstructionVal + it, Ops, NumOps), Parent(0) {
// Make sure that we get added to a basicblock
LeakDetector::addGarbageObject(this);
// append this instruction into the basic block
assert(InsertAtEnd && "Basic block to append to may not be NULL!");
InsertAtEnd->getInstList().push_back(this);
- setName(Name);
}
+
// Out of line virtual method, so the vtable, etc has a home.
Instruction::~Instruction() {
assert(Parent == 0 && "Instruction still linked in the program!");
+ if (hasMetadata()) {
+ LLVMContext &Context = getContext();
+ Context.pImpl->TheMetadata.ValueIsDeleted(this);
+ }
}
getParent()->getInstList().erase(this);
}
+/// insertBefore - Insert an unlinked instructions into a basic block
+/// immediately before the specified instruction.
+void Instruction::insertBefore(Instruction *InsertPos) {
+ InsertPos->getParent()->getInstList().insert(InsertPos, this);
+}
+
+/// insertAfter - Insert an unlinked instructions into a basic block
+/// immediately after the specified instruction.
+void Instruction::insertAfter(Instruction *InsertPos) {
+ InsertPos->getParent()->getInstList().insertAfter(InsertPos, this);
+}
+
/// moveBefore - Unlink this instruction from its current basic block and
/// insert it into the basic block that MovePos lives in, right before
/// MovePos.
// Standard binary operators...
case Add: return "add";
+ case FAdd: return "fadd";
case Sub: return "sub";
+ case FSub: return "fsub";
case Mul: return "mul";
+ case FMul: return "fmul";
case UDiv: return "udiv";
case SDiv: return "sdiv";
case FDiv: return "fdiv";
case Xor: return "xor";
// Memory instructions...
- case Malloc: return "malloc";
- case Free: return "free";
case Alloca: return "alloca";
case Load: return "load";
case Store: return "store";
case ExtractElement: return "extractelement";
case InsertElement: return "insertelement";
case ShuffleVector: return "shufflevector";
+ case ExtractValue: return "extractvalue";
+ case InsertValue: return "insertvalue";
default: return "<Invalid operator> ";
}
/// isIdenticalTo - Return true if the specified instruction is exactly
/// identical to the current one. This means that all operands match and any
/// extra information (e.g. load is volatile) agree.
-bool Instruction::isIdenticalTo(Instruction *I) const {
+bool Instruction::isIdenticalTo(const Instruction *I) const {
+ return isIdenticalToWhenDefined(I) &&
+ SubclassOptionalData == I->SubclassOptionalData;
+}
+
+/// isIdenticalToWhenDefined - This is like isIdenticalTo, except that it
+/// ignores the SubclassOptionalData flags, which specify conditions
+/// under which the instruction's result is undefined.
+bool Instruction::isIdenticalToWhenDefined(const Instruction *I) const {
if (getOpcode() != I->getOpcode() ||
getNumOperands() != I->getNumOperands() ||
getType() != I->getType())
// Check special state that is a part of some instructions.
if (const LoadInst *LI = dyn_cast<LoadInst>(this))
- return LI->isVolatile() == cast<LoadInst>(I)->isVolatile();
+ return LI->isVolatile() == cast<LoadInst>(I)->isVolatile() &&
+ LI->getAlignment() == cast<LoadInst>(I)->getAlignment();
if (const StoreInst *SI = dyn_cast<StoreInst>(this))
- return SI->isVolatile() == cast<StoreInst>(I)->isVolatile();
+ return SI->isVolatile() == cast<StoreInst>(I)->isVolatile() &&
+ SI->getAlignment() == cast<StoreInst>(I)->getAlignment();
if (const CmpInst *CI = dyn_cast<CmpInst>(this))
return CI->getPredicate() == cast<CmpInst>(I)->getPredicate();
if (const CallInst *CI = dyn_cast<CallInst>(this))
- return CI->isTailCall() == cast<CallInst>(I)->isTailCall();
+ return CI->isTailCall() == cast<CallInst>(I)->isTailCall() &&
+ CI->getCallingConv() == cast<CallInst>(I)->getCallingConv() &&
+ CI->getAttributes().getRawPointer() ==
+ cast<CallInst>(I)->getAttributes().getRawPointer();
+ if (const InvokeInst *CI = dyn_cast<InvokeInst>(this))
+ return CI->getCallingConv() == cast<InvokeInst>(I)->getCallingConv() &&
+ CI->getAttributes().getRawPointer() ==
+ cast<InvokeInst>(I)->getAttributes().getRawPointer();
+ if (const InsertValueInst *IVI = dyn_cast<InsertValueInst>(this)) {
+ if (IVI->getNumIndices() != cast<InsertValueInst>(I)->getNumIndices())
+ return false;
+ for (unsigned i = 0, e = IVI->getNumIndices(); i != e; ++i)
+ if (IVI->idx_begin()[i] != cast<InsertValueInst>(I)->idx_begin()[i])
+ return false;
+ return true;
+ }
+ if (const ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(this)) {
+ if (EVI->getNumIndices() != cast<ExtractValueInst>(I)->getNumIndices())
+ return false;
+ for (unsigned i = 0, e = EVI->getNumIndices(); i != e; ++i)
+ if (EVI->idx_begin()[i] != cast<ExtractValueInst>(I)->idx_begin()[i])
+ return false;
+ return true;
+ }
+
return true;
}
// isSameOperationAs
-bool Instruction::isSameOperationAs(Instruction *I) const {
- if (getOpcode() != I->getOpcode() || getType() != I->getType() ||
- getNumOperands() != I->getNumOperands())
+// This should be kept in sync with isEquivalentOperation in
+// lib/Transforms/IPO/MergeFunctions.cpp.
+bool Instruction::isSameOperationAs(const Instruction *I) const {
+ if (getOpcode() != I->getOpcode() ||
+ getNumOperands() != I->getNumOperands() ||
+ getType() != I->getType())
return false;
// We have two instructions of identical opcode and #operands. Check to see
// Check special state that is a part of some instructions.
if (const LoadInst *LI = dyn_cast<LoadInst>(this))
- return LI->isVolatile() == cast<LoadInst>(I)->isVolatile();
+ return LI->isVolatile() == cast<LoadInst>(I)->isVolatile() &&
+ LI->getAlignment() == cast<LoadInst>(I)->getAlignment();
if (const StoreInst *SI = dyn_cast<StoreInst>(this))
- return SI->isVolatile() == cast<StoreInst>(I)->isVolatile();
+ return SI->isVolatile() == cast<StoreInst>(I)->isVolatile() &&
+ SI->getAlignment() == cast<StoreInst>(I)->getAlignment();
if (const CmpInst *CI = dyn_cast<CmpInst>(this))
return CI->getPredicate() == cast<CmpInst>(I)->getPredicate();
if (const CallInst *CI = dyn_cast<CallInst>(this))
- return CI->isTailCall() == cast<CallInst>(I)->isTailCall();
+ return CI->isTailCall() == cast<CallInst>(I)->isTailCall() &&
+ CI->getCallingConv() == cast<CallInst>(I)->getCallingConv() &&
+ CI->getAttributes().getRawPointer() ==
+ cast<CallInst>(I)->getAttributes().getRawPointer();
+ if (const InvokeInst *CI = dyn_cast<InvokeInst>(this))
+ return CI->getCallingConv() == cast<InvokeInst>(I)->getCallingConv() &&
+ CI->getAttributes().getRawPointer() ==
+ cast<InvokeInst>(I)->getAttributes().getRawPointer();
+ if (const InsertValueInst *IVI = dyn_cast<InsertValueInst>(this)) {
+ if (IVI->getNumIndices() != cast<InsertValueInst>(I)->getNumIndices())
+ return false;
+ for (unsigned i = 0, e = IVI->getNumIndices(); i != e; ++i)
+ if (IVI->idx_begin()[i] != cast<InsertValueInst>(I)->idx_begin()[i])
+ return false;
+ return true;
+ }
+ if (const ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(this)) {
+ if (EVI->getNumIndices() != cast<ExtractValueInst>(I)->getNumIndices())
+ return false;
+ for (unsigned i = 0, e = EVI->getNumIndices(); i != e; ++i)
+ if (EVI->idx_begin()[i] != cast<ExtractValueInst>(I)->idx_begin()[i])
+ return false;
+ return true;
+ }
return true;
}
+/// isUsedOutsideOfBlock - Return true if there are any uses of I outside of the
+/// specified block. Note that PHI nodes are considered to evaluate their
+/// operands in the corresponding predecessor block.
+bool Instruction::isUsedOutsideOfBlock(const BasicBlock *BB) const {
+ for (use_const_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
+ // PHI nodes uses values in the corresponding predecessor block. For other
+ // instructions, just check to see whether the parent of the use matches up.
+ const PHINode *PN = dyn_cast<PHINode>(*UI);
+ if (PN == 0) {
+ if (cast<Instruction>(*UI)->getParent() != BB)
+ return true;
+ continue;
+ }
+
+ if (PN->getIncomingBlock(UI) != BB)
+ return true;
+ }
+ return false;
+}
+
+// Code here matches isFreeCall from MallocFreeHelper, 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::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();
+ case Instruction::Store:
+ return cast<StoreInst>(this)->isVolatile();
+ }
+}
+
+/// mayWriteToMemory - Return true if this instruction may modify memory.
+///
+bool Instruction::mayWriteToMemory() const {
+ switch (getOpcode()) {
+ default: return false;
+ 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();
+ case Instruction::Load:
+ return cast<LoadInst>(this)->isVolatile();
+ }
+}
+
+/// mayThrow - Return true if this instruction may throw an exception.
+///
+bool Instruction::mayThrow() const {
+ if (const CallInst *CI = dyn_cast<CallInst>(this))
+ return !CI->doesNotThrow();
+ return false;
+}
/// isAssociative - Return true if the instruction is associative:
///
-/// Associative operators satisfy: x op (y op z) === (x op y) op z)
+/// Associative operators satisfy: x op (y op z) === (x op y) op z
///
-/// In LLVM, the Add, Mul, And, Or, and Xor operators are associative, when not
-/// applied to floating point types.
+/// In LLVM, the Add, Mul, And, Or, and Xor operators are associative.
///
bool Instruction::isAssociative(unsigned Opcode, const Type *Ty) {
- if (Opcode == And || Opcode == Or || Opcode == Xor)
- return true;
-
- // Add/Mul reassociate unless they are FP or FP vectors.
- if (Opcode == Add || Opcode == Mul)
- return !Ty->isFPOrFPVector();
- return 0;
+ return Opcode == And || Opcode == Or || Opcode == Xor ||
+ Opcode == Add || Opcode == Mul;
}
/// isCommutative - Return true if the instruction is commutative:
bool Instruction::isCommutative(unsigned op) {
switch (op) {
case Add:
+ case FAdd:
case Mul:
+ case FMul:
case And:
case Or:
case Xor:
}
}
-/// isTrappingInstruction - Return true if the instruction may trap.
-///
-bool Instruction::isTrapping(unsigned op) {
- switch(op) {
+// Code here matches isMalloc from MallocFreeHelper, which is not in VMCore.
+static bool isMalloc(const Value* I) {
+ const CallInst *CI = dyn_cast<CallInst>(I);
+ if (!CI) {
+ const BitCastInst *BCI = dyn_cast<BitCastInst>(I);
+ if (!BCI) return false;
+
+ CI = dyn_cast<CallInst>(BCI->getOperand(0));
+ }
+
+ if (!CI) return false;
+
+ const Module* M = CI->getParent()->getParent()->getParent();
+ Constant *MallocFunc = M->getFunction("malloc");
+
+ if (CI->getOperand(0) != MallocFunc)
+ return false;
+
+ // 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 {
+ for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
+ if (Constant *C = dyn_cast<Constant>(getOperand(i)))
+ if (C->canTrap())
+ return false;
+
+ switch (getOpcode()) {
+ default:
+ return true;
case UDiv:
+ case URem: {
+ // x / y is undefined if y == 0, but calcuations like x / 3 are safe.
+ ConstantInt *Op = dyn_cast<ConstantInt>(getOperand(1));
+ return Op && !Op->isNullValue();
+ }
case SDiv:
- case FDiv:
- case URem:
- case SRem:
- case FRem:
- case Load:
- case Store:
+ case SRem: {
+ // x / y is undefined if y == 0, and might be undefined if y == -1,
+ // but calcuations like x / 3 are safe.
+ ConstantInt *Op = dyn_cast<ConstantInt>(getOperand(1));
+ return Op && !Op->isNullValue() && !Op->isAllOnesValue();
+ }
+ case Load: {
+ if (cast<LoadInst>(this)->isVolatile())
+ return false;
+ if (isa<AllocaInst>(getOperand(0)) || isMalloc(getOperand(0)))
+ return true;
+ if (GlobalVariable *GV = dyn_cast<GlobalVariable>(getOperand(0)))
+ return !GV->hasExternalWeakLinkage();
+ // FIXME: Handle cases involving GEPs. We have to be careful because
+ // a load of a out-of-bounds GEP has undefined behavior.
+ return false;
+ }
case Call:
+ return false; // The called function could have undefined behavior or
+ // side-effects.
+ // FIXME: We should special-case some intrinsics (bswap,
+ // overflow-checking arithmetic, etc.)
+ case VAArg:
+ case Alloca:
case Invoke:
- return true;
- default:
- return false;
+ case PHI:
+ case Store:
+ case Ret:
+ case Br:
+ case Switch:
+ case Unwind:
+ case Unreachable:
+ return false; // Misc instructions which have effects
}
}
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