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Constant uniquing tables. This allows distinct ConstantExpr objects with the same operation and different flags. Even though a ConstantExpr "a + b" is either always overflowing or never overflowing (due to being a ConstantExpr), it's still necessary to be able to represent it both with and without overflow flags at the same time within the IR, because the safety of the flag may depend on the context of the use. If the constant really does overflow, it wouldn't ever be safe to use with the flag set, however the use may be in code that is never actually executed. This also makes it possible to merge all the flags tests into a single test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80998 91177308-0d34-0410-b5e6-96231b3b80d8
295 lines
9.3 KiB
C++
295 lines
9.3 KiB
C++
//===-- llvm/Operator.h - Operator utility subclass -------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines various classes for working with Instructions and
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// ConstantExprs.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_OPERATOR_H
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#define LLVM_OPERATOR_H
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#include "llvm/Instruction.h"
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#include "llvm/Constants.h"
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namespace llvm {
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class GetElementPtrInst;
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class BinaryOperator;
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class ConstantExpr;
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/// Operator - This is a utility class that provides an abstraction for the
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/// common functionality between Instructions and ConstantExprs.
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///
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class Operator : public User {
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private:
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// Do not implement any of these. The Operator class is intended to be used
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// as a utility, and is never itself instantiated.
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void *operator new(size_t, unsigned);
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void *operator new(size_t s);
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Operator();
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~Operator();
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public:
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/// getOpcode - Return the opcode for this Instruction or ConstantExpr.
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///
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unsigned getOpcode() const {
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if (const Instruction *I = dyn_cast<Instruction>(this))
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return I->getOpcode();
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return cast<ConstantExpr>(this)->getOpcode();
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}
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/// getOpcode - If V is an Instruction or ConstantExpr, return its
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/// opcode. Otherwise return UserOp1.
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///
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static unsigned getOpcode(const Value *V) {
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if (const Instruction *I = dyn_cast<Instruction>(V))
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return I->getOpcode();
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if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
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return CE->getOpcode();
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return Instruction::UserOp1;
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}
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static inline bool classof(const Operator *) { return true; }
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static inline bool classof(const Instruction *I) { return true; }
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static inline bool classof(const ConstantExpr *I) { return true; }
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static inline bool classof(const Value *V) {
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return isa<Instruction>(V) || isa<ConstantExpr>(V);
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}
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};
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/// OverflowingBinaryOperator - Utility class for integer arithmetic operators
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/// which may exhibit overflow - Add, Sub, and Mul. It does not include SDiv,
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/// despite that operator having the potential for overflow.
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///
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class OverflowingBinaryOperator : public Operator {
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public:
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enum {
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NoUnsignedWrap = (1 << 0),
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NoSignedWrap = (1 << 1)
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};
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private:
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~OverflowingBinaryOperator(); // do not implement
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friend class BinaryOperator;
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friend class ConstantExpr;
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void setHasNoUnsignedWrap(bool B) {
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SubclassOptionalData =
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(SubclassOptionalData & ~NoUnsignedWrap) | (B * NoUnsignedWrap);
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}
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void setHasNoSignedWrap(bool B) {
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SubclassOptionalData =
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(SubclassOptionalData & ~NoSignedWrap) | (B * NoSignedWrap);
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}
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public:
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/// hasNoUnsignedWrap - Test whether this operation is known to never
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/// undergo unsigned overflow, aka the nuw property.
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bool hasNoUnsignedWrap() const {
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return SubclassOptionalData & NoUnsignedWrap;
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}
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/// hasNoSignedWrap - Test whether this operation is known to never
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/// undergo signed overflow, aka the nsw property.
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bool hasNoSignedWrap() const {
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return SubclassOptionalData & NoSignedWrap;
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}
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static inline bool classof(const OverflowingBinaryOperator *) { return true; }
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static inline bool classof(const Instruction *I) {
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return I->getOpcode() == Instruction::Add ||
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I->getOpcode() == Instruction::Sub ||
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I->getOpcode() == Instruction::Mul;
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}
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static inline bool classof(const ConstantExpr *CE) {
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return CE->getOpcode() == Instruction::Add ||
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CE->getOpcode() == Instruction::Sub ||
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CE->getOpcode() == Instruction::Mul;
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}
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static inline bool classof(const Value *V) {
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return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
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(isa<ConstantExpr>(V) && classof(cast<ConstantExpr>(V)));
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}
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};
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/// AddOperator - Utility class for integer addition operators.
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///
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class AddOperator : public OverflowingBinaryOperator {
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~AddOperator(); // do not implement
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public:
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static inline bool classof(const AddOperator *) { return true; }
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static inline bool classof(const Instruction *I) {
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return I->getOpcode() == Instruction::Add;
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}
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static inline bool classof(const ConstantExpr *CE) {
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return CE->getOpcode() == Instruction::Add;
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}
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static inline bool classof(const Value *V) {
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return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
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(isa<ConstantExpr>(V) && classof(cast<ConstantExpr>(V)));
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}
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};
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/// SubOperator - Utility class for integer subtraction operators.
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///
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class SubOperator : public OverflowingBinaryOperator {
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~SubOperator(); // do not implement
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public:
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static inline bool classof(const SubOperator *) { return true; }
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static inline bool classof(const Instruction *I) {
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return I->getOpcode() == Instruction::Sub;
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}
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static inline bool classof(const ConstantExpr *CE) {
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return CE->getOpcode() == Instruction::Sub;
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}
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static inline bool classof(const Value *V) {
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return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
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(isa<ConstantExpr>(V) && classof(cast<ConstantExpr>(V)));
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}
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};
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/// MulOperator - Utility class for integer multiplication operators.
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///
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class MulOperator : public OverflowingBinaryOperator {
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~MulOperator(); // do not implement
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public:
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static inline bool classof(const MulOperator *) { return true; }
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static inline bool classof(const Instruction *I) {
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return I->getOpcode() == Instruction::Mul;
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}
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static inline bool classof(const ConstantExpr *CE) {
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return CE->getOpcode() == Instruction::Mul;
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}
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static inline bool classof(const Value *V) {
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return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
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(isa<ConstantExpr>(V) && classof(cast<ConstantExpr>(V)));
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}
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};
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/// SDivOperator - An Operator with opcode Instruction::SDiv.
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///
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class SDivOperator : public Operator {
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public:
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enum {
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IsExact = (1 << 0)
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};
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private:
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~SDivOperator(); // do not implement
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friend class BinaryOperator;
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friend class ConstantExpr;
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void setIsExact(bool B) {
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SubclassOptionalData = (SubclassOptionalData & ~IsExact) | (B * IsExact);
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}
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public:
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/// isExact - Test whether this division is known to be exact, with
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/// zero remainder.
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bool isExact() const {
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return SubclassOptionalData & IsExact;
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}
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const SDivOperator *) { return true; }
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static inline bool classof(const ConstantExpr *CE) {
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return CE->getOpcode() == Instruction::SDiv;
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}
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static inline bool classof(const Instruction *I) {
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return I->getOpcode() == Instruction::SDiv;
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}
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static inline bool classof(const Value *V) {
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return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
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(isa<ConstantExpr>(V) && classof(cast<ConstantExpr>(V)));
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}
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};
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class GEPOperator : public Operator {
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enum {
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IsInBounds = (1 << 0)
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};
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~GEPOperator(); // do not implement
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friend class GetElementPtrInst;
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friend class ConstantExpr;
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void setIsInBounds(bool B) {
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SubclassOptionalData =
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(SubclassOptionalData & ~IsInBounds) | (B * IsInBounds);
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}
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public:
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/// isInBounds - Test whether this is an inbounds GEP, as defined
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/// by LangRef.html.
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bool isInBounds() const {
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return SubclassOptionalData & IsInBounds;
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}
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inline op_iterator idx_begin() { return op_begin()+1; }
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inline const_op_iterator idx_begin() const { return op_begin()+1; }
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inline op_iterator idx_end() { return op_end(); }
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inline const_op_iterator idx_end() const { return op_end(); }
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Value *getPointerOperand() {
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return getOperand(0);
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}
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const Value *getPointerOperand() const {
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return getOperand(0);
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}
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static unsigned getPointerOperandIndex() {
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return 0U; // get index for modifying correct operand
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}
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/// getPointerOperandType - Method to return the pointer operand as a
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/// PointerType.
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const PointerType *getPointerOperandType() const {
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return reinterpret_cast<const PointerType*>(getPointerOperand()->getType());
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}
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unsigned getNumIndices() const { // Note: always non-negative
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return getNumOperands() - 1;
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}
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bool hasIndices() const {
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return getNumOperands() > 1;
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}
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/// hasAllZeroIndices - Return true if all of the indices of this GEP are
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/// zeros. If so, the result pointer and the first operand have the same
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/// value, just potentially different types.
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bool hasAllZeroIndices() const {
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for (const_op_iterator I = idx_begin(), E = idx_end(); I != E; ++I) {
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if (Constant *C = dyn_cast<Constant>(I))
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if (C->isNullValue())
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continue;
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return false;
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}
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return true;
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}
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const GEPOperator *) { return true; }
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static inline bool classof(const GetElementPtrInst *) { return true; }
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static inline bool classof(const ConstantExpr *CE) {
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return CE->getOpcode() == Instruction::GetElementPtr;
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}
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static inline bool classof(const Instruction *I) {
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return I->getOpcode() == Instruction::GetElementPtr;
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}
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static inline bool classof(const Value *V) {
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return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
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(isa<ConstantExpr>(V) && classof(cast<ConstantExpr>(V)));
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}
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};
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} // End llvm namespace
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#endif
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