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510 lines
21 KiB
C++
510 lines
21 KiB
C++
//===- ConstantHandling.cpp - Implement ConstantHandling.h ----------------===//
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//
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// This file implements the various intrinsic operations, on constant values.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ConstantHandling.h"
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#include "llvm/iPHINode.h"
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#include <cmath>
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AnnotationID ConstRules::AID(AnnotationManager::getID("opt::ConstRules",
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&ConstRules::find));
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// ConstantFoldInstruction - Attempt to constant fold the specified instruction.
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// If successful, the constant result is returned, if not, null is returned.
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//
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Constant *ConstantFoldInstruction(Instruction *I) {
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if (PHINode *PN = dyn_cast<PHINode>(I)) {
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if (PN->getNumIncomingValues() == 0)
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return Constant::getNullValue(PN->getType());
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Constant *Result = dyn_cast<Constant>(PN->getIncomingValue(0));
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if (Result == 0) return 0;
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// Handle PHI nodes specially here...
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for (unsigned i = 1, e = PN->getNumIncomingValues(); i != e; ++i)
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if (PN->getIncomingValue(i) != Result)
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return 0; // Not all the same incoming constants...
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// If we reach here, all incoming values are the same constant.
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return Result;
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}
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Constant *Op0 = 0;
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Constant *Op1 = 0;
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if (I->getNumOperands() != 0) { // Get first operand if it's a constant...
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Op0 = dyn_cast<Constant>(I->getOperand(0));
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if (Op0 == 0) return 0; // Not a constant?, can't fold
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if (I->getNumOperands() != 1) { // Get second operand if it's a constant...
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Op1 = dyn_cast<Constant>(I->getOperand(1));
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if (Op1 == 0) return 0; // Not a constant?, can't fold
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}
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}
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switch (I->getOpcode()) {
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case Instruction::Cast:
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return ConstRules::get(*Op0)->castTo(Op0, I->getType());
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case Instruction::Add: return *Op0 + *Op1;
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case Instruction::Sub: return *Op0 - *Op1;
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case Instruction::Mul: return *Op0 * *Op1;
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case Instruction::Div: return *Op0 / *Op1;
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case Instruction::Rem: return *Op0 % *Op1;
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case Instruction::And: return *Op0 & *Op1;
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case Instruction::Or: return *Op0 | *Op1;
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case Instruction::Xor: return *Op0 ^ *Op1;
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case Instruction::SetEQ: return *Op0 == *Op1;
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case Instruction::SetNE: return *Op0 != *Op1;
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case Instruction::SetLE: return *Op0 <= *Op1;
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case Instruction::SetGE: return *Op0 >= *Op1;
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case Instruction::SetLT: return *Op0 < *Op1;
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case Instruction::SetGT: return *Op0 > *Op1;
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case Instruction::Shl: return *Op0 << *Op1;
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case Instruction::Shr: return *Op0 >> *Op1;
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default:
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return 0;
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}
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}
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Constant *ConstantFoldCastInstruction(const Constant *V, const Type *DestTy) {
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return ConstRules::get(*V)->castTo(V, DestTy);
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}
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Constant *ConstantFoldBinaryInstruction(unsigned Opcode, const Constant *V1,
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const Constant *V2) {
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switch (Opcode) {
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case Instruction::Add: return *V1 + *V2;
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case Instruction::Sub: return *V1 - *V2;
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case Instruction::Mul: return *V1 * *V2;
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case Instruction::Div: return *V1 / *V2;
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case Instruction::Rem: return *V1 % *V2;
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case Instruction::And: return *V1 & *V2;
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case Instruction::Or: return *V1 | *V2;
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case Instruction::Xor: return *V1 ^ *V2;
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case Instruction::SetEQ: return *V1 == *V2;
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case Instruction::SetNE: return *V1 != *V2;
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case Instruction::SetLE: return *V1 <= *V2;
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case Instruction::SetGE: return *V1 >= *V2;
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case Instruction::SetLT: return *V1 < *V2;
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case Instruction::SetGT: return *V1 > *V2;
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}
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return 0;
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}
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Constant *ConstantFoldShiftInstruction(unsigned Opcode, const Constant *V1,
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const Constant *V2) {
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switch (Opcode) {
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case Instruction::Shl: return *V1 << *V2;
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case Instruction::Shr: return *V1 >> *V2;
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default: return 0;
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}
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}
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//===----------------------------------------------------------------------===//
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// TemplateRules Class
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//===----------------------------------------------------------------------===//
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//
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// TemplateRules - Implement a subclass of ConstRules that provides all
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// operations as noops. All other rules classes inherit from this class so
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// that if functionality is needed in the future, it can simply be added here
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// and to ConstRules without changing anything else...
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//
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// This class also provides subclasses with typesafe implementations of methods
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// so that don't have to do type casting.
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//
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template<class ArgType, class SubClassName>
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class TemplateRules : public ConstRules {
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//===--------------------------------------------------------------------===//
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// Redirecting functions that cast to the appropriate types
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//===--------------------------------------------------------------------===//
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virtual Constant *add(const Constant *V1, const Constant *V2) const {
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return SubClassName::Add((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual Constant *sub(const Constant *V1, const Constant *V2) const {
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return SubClassName::Sub((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual Constant *mul(const Constant *V1, const Constant *V2) const {
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return SubClassName::Mul((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual Constant *div(const Constant *V1, const Constant *V2) const {
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return SubClassName::Div((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual Constant *rem(const Constant *V1, const Constant *V2) const {
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return SubClassName::Rem((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual Constant *op_and(const Constant *V1, const Constant *V2) const {
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return SubClassName::And((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual Constant *op_or(const Constant *V1, const Constant *V2) const {
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return SubClassName::Or((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual Constant *op_xor(const Constant *V1, const Constant *V2) const {
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return SubClassName::Xor((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual Constant *shl(const Constant *V1, const Constant *V2) const {
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return SubClassName::Shl((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual Constant *shr(const Constant *V1, const Constant *V2) const {
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return SubClassName::Shr((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual ConstantBool *lessthan(const Constant *V1,
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const Constant *V2) const {
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return SubClassName::LessThan((const ArgType *)V1, (const ArgType *)V2);
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}
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// Casting operators. ick
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virtual ConstantBool *castToBool(const Constant *V) const {
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return SubClassName::CastToBool((const ArgType*)V);
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}
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virtual ConstantSInt *castToSByte(const Constant *V) const {
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return SubClassName::CastToSByte((const ArgType*)V);
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}
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virtual ConstantUInt *castToUByte(const Constant *V) const {
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return SubClassName::CastToUByte((const ArgType*)V);
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}
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virtual ConstantSInt *castToShort(const Constant *V) const {
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return SubClassName::CastToShort((const ArgType*)V);
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}
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virtual ConstantUInt *castToUShort(const Constant *V) const {
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return SubClassName::CastToUShort((const ArgType*)V);
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}
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virtual ConstantSInt *castToInt(const Constant *V) const {
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return SubClassName::CastToInt((const ArgType*)V);
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}
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virtual ConstantUInt *castToUInt(const Constant *V) const {
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return SubClassName::CastToUInt((const ArgType*)V);
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}
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virtual ConstantSInt *castToLong(const Constant *V) const {
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return SubClassName::CastToLong((const ArgType*)V);
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}
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virtual ConstantUInt *castToULong(const Constant *V) const {
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return SubClassName::CastToULong((const ArgType*)V);
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}
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virtual ConstantFP *castToFloat(const Constant *V) const {
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return SubClassName::CastToFloat((const ArgType*)V);
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}
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virtual ConstantFP *castToDouble(const Constant *V) const {
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return SubClassName::CastToDouble((const ArgType*)V);
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}
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virtual ConstantPointer *castToPointer(const Constant *V,
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const PointerType *Ty) const {
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return SubClassName::CastToPointer((const ArgType*)V, Ty);
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}
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//===--------------------------------------------------------------------===//
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// Default "noop" implementations
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//===--------------------------------------------------------------------===//
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static Constant *Add(const ArgType *V1, const ArgType *V2) { return 0; }
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static Constant *Sub(const ArgType *V1, const ArgType *V2) { return 0; }
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static Constant *Mul(const ArgType *V1, const ArgType *V2) { return 0; }
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static Constant *Div(const ArgType *V1, const ArgType *V2) { return 0; }
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static Constant *Rem(const ArgType *V1, const ArgType *V2) { return 0; }
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static Constant *And(const ArgType *V1, const ArgType *V2) { return 0; }
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static Constant *Or (const ArgType *V1, const ArgType *V2) { return 0; }
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static Constant *Xor(const ArgType *V1, const ArgType *V2) { return 0; }
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static Constant *Shl(const ArgType *V1, const ArgType *V2) { return 0; }
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static Constant *Shr(const ArgType *V1, const ArgType *V2) { return 0; }
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static ConstantBool *LessThan(const ArgType *V1, const ArgType *V2) {
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return 0;
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}
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// Casting operators. ick
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static ConstantBool *CastToBool (const Constant *V) { return 0; }
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static ConstantSInt *CastToSByte (const Constant *V) { return 0; }
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static ConstantUInt *CastToUByte (const Constant *V) { return 0; }
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static ConstantSInt *CastToShort (const Constant *V) { return 0; }
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static ConstantUInt *CastToUShort(const Constant *V) { return 0; }
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static ConstantSInt *CastToInt (const Constant *V) { return 0; }
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static ConstantUInt *CastToUInt (const Constant *V) { return 0; }
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static ConstantSInt *CastToLong (const Constant *V) { return 0; }
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static ConstantUInt *CastToULong (const Constant *V) { return 0; }
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static ConstantFP *CastToFloat (const Constant *V) { return 0; }
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static ConstantFP *CastToDouble(const Constant *V) { return 0; }
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static ConstantPointer *CastToPointer(const Constant *,
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const PointerType *) {return 0;}
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};
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//===----------------------------------------------------------------------===//
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// EmptyRules Class
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//===----------------------------------------------------------------------===//
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//
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// EmptyRules provides a concrete base class of ConstRules that does nothing
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//
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struct EmptyRules : public TemplateRules<Constant, EmptyRules> {
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};
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//===----------------------------------------------------------------------===//
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// BoolRules Class
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//===----------------------------------------------------------------------===//
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//
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// BoolRules provides a concrete base class of ConstRules for the 'bool' type.
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//
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struct BoolRules : public TemplateRules<ConstantBool, BoolRules> {
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static ConstantBool *LessThan(const ConstantBool *V1, const ConstantBool *V2){
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return ConstantBool::get(V1->getValue() < V2->getValue());
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}
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static Constant *And(const ConstantBool *V1, const ConstantBool *V2) {
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return ConstantBool::get(V1->getValue() & V2->getValue());
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}
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static Constant *Or(const ConstantBool *V1, const ConstantBool *V2) {
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return ConstantBool::get(V1->getValue() | V2->getValue());
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}
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static Constant *Xor(const ConstantBool *V1, const ConstantBool *V2) {
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return ConstantBool::get(V1->getValue() ^ V2->getValue());
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}
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};
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//===----------------------------------------------------------------------===//
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// PointerRules Class
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//===----------------------------------------------------------------------===//
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//
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// PointerRules provides a concrete base class of ConstRules for pointer types
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//
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struct PointerRules : public TemplateRules<ConstantPointer, PointerRules> {
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static ConstantBool *CastToBool (const Constant *V) {
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if (V->isNullValue()) return ConstantBool::False;
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return 0; // Can't const prop other types of pointers
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}
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static ConstantSInt *CastToSByte (const Constant *V) {
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if (V->isNullValue()) return ConstantSInt::get(Type::SByteTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantUInt *CastToUByte (const Constant *V) {
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if (V->isNullValue()) return ConstantUInt::get(Type::UByteTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantSInt *CastToShort (const Constant *V) {
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if (V->isNullValue()) return ConstantSInt::get(Type::ShortTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantUInt *CastToUShort(const Constant *V) {
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if (V->isNullValue()) return ConstantUInt::get(Type::UShortTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantSInt *CastToInt (const Constant *V) {
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if (V->isNullValue()) return ConstantSInt::get(Type::IntTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantUInt *CastToUInt (const Constant *V) {
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if (V->isNullValue()) return ConstantUInt::get(Type::UIntTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantSInt *CastToLong (const Constant *V) {
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if (V->isNullValue()) return ConstantSInt::get(Type::LongTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantUInt *CastToULong (const Constant *V) {
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if (V->isNullValue()) return ConstantUInt::get(Type::ULongTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantFP *CastToFloat (const Constant *V) {
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if (V->isNullValue()) return ConstantFP::get(Type::FloatTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantFP *CastToDouble(const Constant *V) {
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if (V->isNullValue()) return ConstantFP::get(Type::DoubleTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantPointer *CastToPointer(const ConstantPointer *V,
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const PointerType *PTy) {
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if (V->getType() == PTy)
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return const_cast<ConstantPointer*>(V); // Allow cast %PTy %ptr to %PTy
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if (V->isNullValue())
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return ConstantPointerNull::get(PTy);
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return 0; // Can't const prop other types of pointers
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}
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};
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//===----------------------------------------------------------------------===//
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// DirectRules Class
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//===----------------------------------------------------------------------===//
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//
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// DirectRules provides a concrete base classes of ConstRules for a variety of
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// different types. This allows the C++ compiler to automatically generate our
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// constant handling operations in a typesafe and accurate manner.
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//
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template<class ConstantClass, class BuiltinType, Type **Ty, class SuperClass>
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struct DirectRules : public TemplateRules<ConstantClass, SuperClass> {
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static Constant *Add(const ConstantClass *V1, const ConstantClass *V2) {
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BuiltinType R = (BuiltinType)V1->getValue() + (BuiltinType)V2->getValue();
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return ConstantClass::get(*Ty, R);
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}
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static Constant *Sub(const ConstantClass *V1, const ConstantClass *V2) {
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BuiltinType R = (BuiltinType)V1->getValue() - (BuiltinType)V2->getValue();
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return ConstantClass::get(*Ty, R);
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}
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static Constant *Mul(const ConstantClass *V1, const ConstantClass *V2) {
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BuiltinType R = (BuiltinType)V1->getValue() * (BuiltinType)V2->getValue();
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return ConstantClass::get(*Ty, R);
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}
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static Constant *Div(const ConstantClass *V1, const ConstantClass *V2) {
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if (V2->isNullValue()) return 0;
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BuiltinType R = (BuiltinType)V1->getValue() / (BuiltinType)V2->getValue();
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return ConstantClass::get(*Ty, R);
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}
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static ConstantBool *LessThan(const ConstantClass *V1,
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const ConstantClass *V2) {
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bool R = (BuiltinType)V1->getValue() < (BuiltinType)V2->getValue();
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return ConstantBool::get(R);
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}
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static ConstantPointer *CastToPointer(const ConstantClass *V,
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const PointerType *PTy) {
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if (V->isNullValue()) // Is it a FP or Integral null value?
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return ConstantPointerNull::get(PTy);
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return 0; // Can't const prop other types of pointers
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}
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// Casting operators. ick
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#define DEF_CAST(TYPE, CLASS, CTYPE) \
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static CLASS *CastTo##TYPE (const ConstantClass *V) { \
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return CLASS::get(Type::TYPE##Ty, (CTYPE)(BuiltinType)V->getValue()); \
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}
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DEF_CAST(Bool , ConstantBool, bool)
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DEF_CAST(SByte , ConstantSInt, signed char)
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DEF_CAST(UByte , ConstantUInt, unsigned char)
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DEF_CAST(Short , ConstantSInt, signed short)
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DEF_CAST(UShort, ConstantUInt, unsigned short)
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DEF_CAST(Int , ConstantSInt, signed int)
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DEF_CAST(UInt , ConstantUInt, unsigned int)
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DEF_CAST(Long , ConstantSInt, int64_t)
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DEF_CAST(ULong , ConstantUInt, uint64_t)
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DEF_CAST(Float , ConstantFP , float)
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DEF_CAST(Double, ConstantFP , double)
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#undef DEF_CAST
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};
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//===----------------------------------------------------------------------===//
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// DirectIntRules Class
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//===----------------------------------------------------------------------===//
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//
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// DirectIntRules provides implementations of functions that are valid on
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// integer types, but not all types in general.
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//
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template <class ConstantClass, class BuiltinType, Type **Ty>
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struct DirectIntRules
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: public DirectRules<ConstantClass, BuiltinType, Ty,
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DirectIntRules<ConstantClass, BuiltinType, Ty> > {
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static Constant *Rem(const ConstantClass *V1,
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const ConstantClass *V2) {
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if (V2->isNullValue()) return 0;
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BuiltinType R = (BuiltinType)V1->getValue() % (BuiltinType)V2->getValue();
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return ConstantClass::get(*Ty, R);
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}
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static Constant *And(const ConstantClass *V1, const ConstantClass *V2) {
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BuiltinType R = (BuiltinType)V1->getValue() & (BuiltinType)V2->getValue();
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return ConstantClass::get(*Ty, R);
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}
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static Constant *Or(const ConstantClass *V1, const ConstantClass *V2) {
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BuiltinType R = (BuiltinType)V1->getValue() | (BuiltinType)V2->getValue();
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return ConstantClass::get(*Ty, R);
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}
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static Constant *Xor(const ConstantClass *V1, const ConstantClass *V2) {
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BuiltinType R = (BuiltinType)V1->getValue() ^ (BuiltinType)V2->getValue();
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return ConstantClass::get(*Ty, R);
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}
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static Constant *Shl(const ConstantClass *V1, const ConstantClass *V2) {
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BuiltinType R = (BuiltinType)V1->getValue() << (BuiltinType)V2->getValue();
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return ConstantClass::get(*Ty, R);
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}
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static Constant *Shr(const ConstantClass *V1, const ConstantClass *V2) {
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BuiltinType R = (BuiltinType)V1->getValue() >> (BuiltinType)V2->getValue();
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return ConstantClass::get(*Ty, R);
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}
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};
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//===----------------------------------------------------------------------===//
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// DirectFPRules Class
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//===----------------------------------------------------------------------===//
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//
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// DirectFPRules provides implementations of functions that are valid on
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// floating point types, but not all types in general.
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//
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template <class ConstantClass, class BuiltinType, Type **Ty>
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struct DirectFPRules
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: public DirectRules<ConstantClass, BuiltinType, Ty,
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DirectFPRules<ConstantClass, BuiltinType, Ty> > {
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static Constant *Rem(const ConstantClass *V1, const ConstantClass *V2) {
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if (V2->isNullValue()) return 0;
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BuiltinType Result = std::fmod((BuiltinType)V1->getValue(),
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(BuiltinType)V2->getValue());
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return ConstantClass::get(*Ty, Result);
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}
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};
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//===----------------------------------------------------------------------===//
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// DirectRules Subclasses
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//===----------------------------------------------------------------------===//
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//
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|
// Given the DirectRules class we can now implement lots of types with little
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// code. Thank goodness C++ compilers are great at stomping out layers of
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// templates... can you imagine having to do this all by hand? (/me is lazy :)
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|
//
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|
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// ConstRules::find - Return the constant rules that take care of the specified
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// type.
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//
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Annotation *ConstRules::find(AnnotationID AID, const Annotable *TyA, void *) {
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assert(AID == ConstRules::AID && "Bad annotation for factory!");
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|
const Type *Ty = cast<Type>((const Value*)TyA);
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|
|
|
switch (Ty->getPrimitiveID()) {
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|
case Type::BoolTyID: return new BoolRules();
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case Type::PointerTyID: return new PointerRules();
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|
case Type::SByteTyID:
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return new DirectIntRules<ConstantSInt, signed char , &Type::SByteTy>();
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|
case Type::UByteTyID:
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|
return new DirectIntRules<ConstantUInt, unsigned char , &Type::UByteTy>();
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|
case Type::ShortTyID:
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return new DirectIntRules<ConstantSInt, signed short, &Type::ShortTy>();
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|
case Type::UShortTyID:
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|
return new DirectIntRules<ConstantUInt, unsigned short, &Type::UShortTy>();
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|
case Type::IntTyID:
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|
return new DirectIntRules<ConstantSInt, signed int , &Type::IntTy>();
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|
case Type::UIntTyID:
|
|
return new DirectIntRules<ConstantUInt, unsigned int , &Type::UIntTy>();
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|
case Type::LongTyID:
|
|
return new DirectIntRules<ConstantSInt, int64_t , &Type::LongTy>();
|
|
case Type::ULongTyID:
|
|
return new DirectIntRules<ConstantUInt, uint64_t , &Type::ULongTy>();
|
|
case Type::FloatTyID:
|
|
return new DirectFPRules<ConstantFP , float , &Type::FloatTy>();
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|
case Type::DoubleTyID:
|
|
return new DirectFPRules<ConstantFP , double , &Type::DoubleTy>();
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|
default:
|
|
return new EmptyRules();
|
|
}
|
|
}
|