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243 lines
9.9 KiB
C++
243 lines
9.9 KiB
C++
//===-- ConstantHandling.h - Stuff for manipulating constants ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the declarations of some cool operators that allow you
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// to do natural things with constant pool values.
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//
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// Unfortunately we can't overload operators on pointer types (like this:)
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//
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// inline bool operator==(const Constant *V1, const Constant *V2)
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//
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// so we must make due with references, even though it leads to some butt ugly
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// looking code downstream. *sigh* (ex: Constant *Result = *V1 + *v2; )
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//
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//===----------------------------------------------------------------------===//
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//
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// WARNING: These operators may return a null object if I don't know how to
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// perform the specified operation on the specified constant types.
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//
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//===----------------------------------------------------------------------===//
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//
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// Implementation notes:
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// This library is implemented this way for a reason: In most cases, we do
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// not want to have to link the constant mucking code into an executable.
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// We do, however want to tie some of this into the main type system, as an
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// optional component. By using a mutable cache member in the Type class, we
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// get exactly the kind of behavior we want.
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//
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// In the end, we get performance almost exactly the same as having a virtual
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// function dispatch, but we don't have to put our virtual functions into the
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// "Type" class, and we can implement functionality with templates. Good deal.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CONSTANTHANDLING_H
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#define LLVM_CONSTANTHANDLING_H
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#include "llvm/Constants.h"
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#include "llvm/Type.h"
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namespace llvm {
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class PointerType;
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//===----------------------------------------------------------------------===//
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// Implement all other operators indirectly through TypeRules system
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//===----------------------------------------------------------------------===//
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struct ConstRules {
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ConstRules() {}
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// Binary Operators...
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virtual Constant *add(const Constant *V1, const Constant *V2) const = 0;
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virtual Constant *sub(const Constant *V1, const Constant *V2) const = 0;
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virtual Constant *mul(const Constant *V1, const Constant *V2) const = 0;
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virtual Constant *div(const Constant *V1, const Constant *V2) const = 0;
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virtual Constant *rem(const Constant *V1, const Constant *V2) const = 0;
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virtual Constant *op_and(const Constant *V1, const Constant *V2) const = 0;
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virtual Constant *op_or (const Constant *V1, const Constant *V2) const = 0;
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virtual Constant *op_xor(const Constant *V1, const Constant *V2) const = 0;
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virtual Constant *shl(const Constant *V1, const Constant *V2) const = 0;
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virtual Constant *shr(const Constant *V1, const Constant *V2) const = 0;
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virtual ConstantBool *lessthan(const Constant *V1,
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const Constant *V2) const = 0;
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virtual ConstantBool *equalto(const Constant *V1,
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const Constant *V2) const = 0;
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// Casting operators. ick
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virtual ConstantBool *castToBool (const Constant *V) const = 0;
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virtual ConstantSInt *castToSByte (const Constant *V) const = 0;
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virtual ConstantUInt *castToUByte (const Constant *V) const = 0;
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virtual ConstantSInt *castToShort (const Constant *V) const = 0;
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virtual ConstantUInt *castToUShort(const Constant *V) const = 0;
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virtual ConstantSInt *castToInt (const Constant *V) const = 0;
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virtual ConstantUInt *castToUInt (const Constant *V) const = 0;
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virtual ConstantSInt *castToLong (const Constant *V) const = 0;
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virtual ConstantUInt *castToULong (const Constant *V) const = 0;
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virtual ConstantFP *castToFloat (const Constant *V) const = 0;
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virtual ConstantFP *castToDouble(const Constant *V) const = 0;
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virtual Constant *castToPointer(const Constant *V,
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const PointerType *Ty) const = 0;
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inline Constant *castTo(const Constant *V, const Type *Ty) const {
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switch (Ty->getPrimitiveID()) {
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case Type::BoolTyID: return castToBool(V);
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case Type::UByteTyID: return castToUByte(V);
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case Type::SByteTyID: return castToSByte(V);
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case Type::UShortTyID: return castToUShort(V);
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case Type::ShortTyID: return castToShort(V);
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case Type::UIntTyID: return castToUInt(V);
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case Type::IntTyID: return castToInt(V);
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case Type::ULongTyID: return castToULong(V);
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case Type::LongTyID: return castToLong(V);
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case Type::FloatTyID: return castToFloat(V);
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case Type::DoubleTyID: return castToDouble(V);
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case Type::PointerTyID:
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return castToPointer(V, reinterpret_cast<const PointerType*>(Ty));
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default: return 0;
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}
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}
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// ConstRules::get - Return an instance of ConstRules for the specified
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// constant operands.
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//
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static ConstRules &get(const Constant &V1, const Constant &V2);
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private:
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ConstRules(const ConstRules &); // Do not implement
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ConstRules &operator=(const ConstRules &); // Do not implement
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};
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// Unary operators...
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inline Constant *operator~(const Constant &V) {
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assert(V.getType()->isIntegral() && "Cannot invert non-integral constant!");
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return ConstRules::get(V, V).op_xor(&V,
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ConstantInt::getAllOnesValue(V.getType()));
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}
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inline Constant *operator-(const Constant &V) {
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return ConstRules::get(V, V).sub(Constant::getNullValue(V.getType()), &V);
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}
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// Standard binary operators...
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inline Constant *operator+(const Constant &V1, const Constant &V2) {
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assert(V1.getType() == V2.getType() && "Constant types must be identical!");
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return ConstRules::get(V1, V2).add(&V1, &V2);
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}
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inline Constant *operator-(const Constant &V1, const Constant &V2) {
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assert(V1.getType() == V2.getType() && "Constant types must be identical!");
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return ConstRules::get(V1, V2).sub(&V1, &V2);
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}
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inline Constant *operator*(const Constant &V1, const Constant &V2) {
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assert(V1.getType() == V2.getType() && "Constant types must be identical!");
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return ConstRules::get(V1, V2).mul(&V1, &V2);
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}
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inline Constant *operator/(const Constant &V1, const Constant &V2) {
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assert(V1.getType() == V2.getType() && "Constant types must be identical!");
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return ConstRules::get(V1, V2).div(&V1, &V2);
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}
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inline Constant *operator%(const Constant &V1, const Constant &V2) {
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assert(V1.getType() == V2.getType() && "Constant types must be identical!");
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return ConstRules::get(V1, V2).rem(&V1, &V2);
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}
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// Logical Operators...
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inline Constant *operator&(const Constant &V1, const Constant &V2) {
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assert(V1.getType() == V2.getType() && "Constant types must be identical!");
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return ConstRules::get(V1, V2).op_and(&V1, &V2);
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}
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inline Constant *operator|(const Constant &V1, const Constant &V2) {
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assert(V1.getType() == V2.getType() && "Constant types must be identical!");
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return ConstRules::get(V1, V2).op_or(&V1, &V2);
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}
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inline Constant *operator^(const Constant &V1, const Constant &V2) {
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assert(V1.getType() == V2.getType() && "Constant types must be identical!");
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return ConstRules::get(V1, V2).op_xor(&V1, &V2);
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}
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// Shift Instructions...
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inline Constant *operator<<(const Constant &V1, const Constant &V2) {
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assert(V1.getType()->isInteger() && V2.getType() == Type::UByteTy);
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return ConstRules::get(V1, V2).shl(&V1, &V2);
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}
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inline Constant *operator>>(const Constant &V1, const Constant &V2) {
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assert(V1.getType()->isInteger() && V2.getType() == Type::UByteTy);
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return ConstRules::get(V1, V2).shr(&V1, &V2);
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}
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inline ConstantBool *operator<(const Constant &V1,
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const Constant &V2) {
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assert(V1.getType() == V2.getType() && "Constant types must be identical!");
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return ConstRules::get(V1, V2).lessthan(&V1, &V2);
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}
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inline ConstantBool *operator==(const Constant &V1, const Constant &V2) {
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assert(V1.getType() == V2.getType() && "Constant types must be identical!");
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return ConstRules::get(V1, V2).equalto(&V1, &V2);
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}
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//===----------------------------------------------------------------------===//
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// Implement 'derived' operators based on what we already have...
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//===----------------------------------------------------------------------===//
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inline ConstantBool *operator!=(const Constant &V1, const Constant &V2) {
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if (ConstantBool *V = (V1 == V2))
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return V->inverted(); // !(V1 == V2)
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return 0;
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}
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inline ConstantBool *operator>(const Constant &V1,
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const Constant &V2) {
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return V2 < V1;
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}
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inline ConstantBool *operator>=(const Constant &V1,
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const Constant &V2) {
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if (ConstantBool *V = (V1 < V2))
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return V->inverted(); // !(V1 < V2)
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return 0;
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}
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inline ConstantBool *operator<=(const Constant &V1,
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const Constant &V2) {
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if (ConstantBool *V = (V1 > V2))
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return V->inverted(); // !(V1 > V2)
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return 0;
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}
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//===----------------------------------------------------------------------===//
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// Implement higher level instruction folding type instructions
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//===----------------------------------------------------------------------===//
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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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// Constant fold various types of instruction...
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Constant *ConstantFoldCastInstruction(const Constant *V, const Type *DestTy);
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Constant *ConstantFoldBinaryInstruction(unsigned Opcode, const Constant *V1,
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const Constant *V2);
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Constant *ConstantFoldShiftInstruction(unsigned Opcode, const Constant *V1,
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const Constant *V2);
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Constant *ConstantFoldGetElementPtr(const Constant *C,
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const std::vector<Constant*> &IdxList);
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} // End llvm namespace
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#endif
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