mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-29 13:29:28 +00:00
it. No functionality change! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124286 91177308-0d34-0410-b5e6-96231b3b80d8
437 lines
15 KiB
C++
437 lines
15 KiB
C++
//===-- Instruction.cpp - Implement the Instruction class -----------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the Instruction class for the VMCore library.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Instruction.h"
|
|
#include "llvm/Type.h"
|
|
#include "llvm/Instructions.h"
|
|
#include "llvm/Constants.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,
|
|
Instruction *InsertBefore)
|
|
: User(ty, Value::InstructionVal + it, Ops, NumOps), Parent(0) {
|
|
// Make sure that we get added to a basicblock
|
|
LeakDetector::addGarbageObject(this);
|
|
|
|
// If requested, insert this instruction into a basic block...
|
|
if (InsertBefore) {
|
|
assert(InsertBefore->getParent() &&
|
|
"Instruction to insert before is not in a basic block!");
|
|
InsertBefore->getParent()->getInstList().insert(InsertBefore, this);
|
|
}
|
|
}
|
|
|
|
Instruction::Instruction(const Type *ty, unsigned it, Use *Ops, unsigned NumOps,
|
|
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);
|
|
}
|
|
|
|
|
|
// Out of line virtual method, so the vtable, etc has a home.
|
|
Instruction::~Instruction() {
|
|
assert(Parent == 0 && "Instruction still linked in the program!");
|
|
if (hasMetadataHashEntry())
|
|
clearMetadataHashEntries();
|
|
}
|
|
|
|
|
|
void Instruction::setParent(BasicBlock *P) {
|
|
if (getParent()) {
|
|
if (!P) LeakDetector::addGarbageObject(this);
|
|
} else {
|
|
if (P) LeakDetector::removeGarbageObject(this);
|
|
}
|
|
|
|
Parent = P;
|
|
}
|
|
|
|
void Instruction::removeFromParent() {
|
|
getParent()->getInstList().remove(this);
|
|
}
|
|
|
|
void Instruction::eraseFromParent() {
|
|
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.
|
|
void Instruction::moveBefore(Instruction *MovePos) {
|
|
MovePos->getParent()->getInstList().splice(MovePos,getParent()->getInstList(),
|
|
this);
|
|
}
|
|
|
|
|
|
const char *Instruction::getOpcodeName(unsigned OpCode) {
|
|
switch (OpCode) {
|
|
// Terminators
|
|
case Ret: return "ret";
|
|
case Br: return "br";
|
|
case Switch: return "switch";
|
|
case IndirectBr: return "indirectbr";
|
|
case Invoke: return "invoke";
|
|
case Unwind: return "unwind";
|
|
case Unreachable: return "unreachable";
|
|
|
|
// 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 URem: return "urem";
|
|
case SRem: return "srem";
|
|
case FRem: return "frem";
|
|
|
|
// Logical operators...
|
|
case And: return "and";
|
|
case Or : return "or";
|
|
case Xor: return "xor";
|
|
|
|
// Memory instructions...
|
|
case Alloca: return "alloca";
|
|
case Load: return "load";
|
|
case Store: return "store";
|
|
case GetElementPtr: return "getelementptr";
|
|
|
|
// Convert instructions...
|
|
case Trunc: return "trunc";
|
|
case ZExt: return "zext";
|
|
case SExt: return "sext";
|
|
case FPTrunc: return "fptrunc";
|
|
case FPExt: return "fpext";
|
|
case FPToUI: return "fptoui";
|
|
case FPToSI: return "fptosi";
|
|
case UIToFP: return "uitofp";
|
|
case SIToFP: return "sitofp";
|
|
case IntToPtr: return "inttoptr";
|
|
case PtrToInt: return "ptrtoint";
|
|
case BitCast: return "bitcast";
|
|
|
|
// Other instructions...
|
|
case ICmp: return "icmp";
|
|
case FCmp: return "fcmp";
|
|
case PHI: return "phi";
|
|
case Select: return "select";
|
|
case Call: return "call";
|
|
case Shl: return "shl";
|
|
case LShr: return "lshr";
|
|
case AShr: return "ashr";
|
|
case VAArg: return "va_arg";
|
|
case ExtractElement: return "extractelement";
|
|
case InsertElement: return "insertelement";
|
|
case ShuffleVector: return "shufflevector";
|
|
case ExtractValue: return "extractvalue";
|
|
case InsertValue: return "insertvalue";
|
|
|
|
default: return "<Invalid operator> ";
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/// 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(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())
|
|
return false;
|
|
|
|
// We have two instructions of identical opcode and #operands. Check to see
|
|
// if all operands are the same.
|
|
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
|
|
if (getOperand(i) != I->getOperand(i))
|
|
return false;
|
|
|
|
// 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() &&
|
|
LI->getAlignment() == cast<LoadInst>(I)->getAlignment();
|
|
if (const StoreInst *SI = dyn_cast<StoreInst>(this))
|
|
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() &&
|
|
CI->getCallingConv() == cast<CallInst>(I)->getCallingConv() &&
|
|
CI->getAttributes() == cast<CallInst>(I)->getAttributes();
|
|
if (const InvokeInst *CI = dyn_cast<InvokeInst>(this))
|
|
return CI->getCallingConv() == cast<InvokeInst>(I)->getCallingConv() &&
|
|
CI->getAttributes() == cast<InvokeInst>(I)->getAttributes();
|
|
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
|
|
// 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
|
|
// if all operands are the same type
|
|
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
|
|
if (getOperand(i)->getType() != I->getOperand(i)->getType())
|
|
return false;
|
|
|
|
// 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() &&
|
|
LI->getAlignment() == cast<LoadInst>(I)->getAlignment();
|
|
if (const StoreInst *SI = dyn_cast<StoreInst>(this))
|
|
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() &&
|
|
CI->getCallingConv() == cast<CallInst>(I)->getCallingConv() &&
|
|
CI->getAttributes() == cast<CallInst>(I)->getAttributes();
|
|
if (const InvokeInst *CI = dyn_cast<InvokeInst>(this))
|
|
return CI->getCallingConv() == cast<InvokeInst>(I)->getCallingConv() &&
|
|
CI->getAttributes() ==
|
|
cast<InvokeInst>(I)->getAttributes();
|
|
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 (const_use_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 User *U = *UI;
|
|
const PHINode *PN = dyn_cast<PHINode>(U);
|
|
if (PN == 0) {
|
|
if (cast<Instruction>(U)->getParent() != BB)
|
|
return true;
|
|
continue;
|
|
}
|
|
|
|
if (PN->getIncomingBlock(UI) != BB)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/// 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:
|
|
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:
|
|
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
|
|
///
|
|
/// In LLVM, the Add, Mul, And, Or, and Xor operators are associative.
|
|
///
|
|
bool Instruction::isAssociative(unsigned Opcode) {
|
|
return Opcode == And || Opcode == Or || Opcode == Xor ||
|
|
Opcode == Add || Opcode == Mul;
|
|
}
|
|
|
|
/// isCommutative - Return true if the instruction is commutative:
|
|
///
|
|
/// Commutative operators satisfy: (x op y) === (y op x)
|
|
///
|
|
/// In LLVM, these are the associative operators, plus SetEQ and SetNE, when
|
|
/// applied to any type.
|
|
///
|
|
bool Instruction::isCommutative(unsigned op) {
|
|
switch (op) {
|
|
case Add:
|
|
case FAdd:
|
|
case Mul:
|
|
case FMul:
|
|
case And:
|
|
case Or:
|
|
case Xor:
|
|
return true;
|
|
default:
|
|
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 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: {
|
|
const LoadInst *LI = cast<LoadInst>(this);
|
|
if (LI->isVolatile())
|
|
return false;
|
|
return LI->getPointerOperand()->isDereferenceablePointer();
|
|
}
|
|
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:
|
|
case PHI:
|
|
case Store:
|
|
case Ret:
|
|
case Br:
|
|
case IndirectBr:
|
|
case Switch:
|
|
case Unwind:
|
|
case Unreachable:
|
|
return false; // Misc instructions which have effects
|
|
}
|
|
}
|
|
|
|
Instruction *Instruction::clone() const {
|
|
Instruction *New = clone_impl();
|
|
New->SubclassOptionalData = SubclassOptionalData;
|
|
if (!hasMetadata())
|
|
return New;
|
|
|
|
// Otherwise, enumerate and copy over metadata from the old instruction to the
|
|
// new one.
|
|
SmallVector<std::pair<unsigned, MDNode*>, 4> TheMDs;
|
|
getAllMetadata(TheMDs);
|
|
for (unsigned i = 0, e = TheMDs.size(); i != e; ++i)
|
|
New->setMetadata(TheMDs[i].first, TheMDs[i].second);
|
|
return New;
|
|
}
|