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CastInst and ConstantExpr that allow the signedness to be explicitly passed in and reliance on signedness removed from getCastOpcode. These are temporary measures useful during the conversion of inferred casts. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32164 91177308-0d34-0410-b5e6-96231b3b80d8
510 lines
22 KiB
C++
510 lines
22 KiB
C++
//===-- llvm/InstrTypes.h - Important Instruction subclasses ----*- 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 defines various meta classes of instructions that exist in the VM
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// representation. Specific concrete subclasses of these may be found in the
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// i*.h files...
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_INSTRUCTION_TYPES_H
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#define LLVM_INSTRUCTION_TYPES_H
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#include "llvm/Instruction.h"
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namespace llvm {
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//===----------------------------------------------------------------------===//
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// TerminatorInst Class
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//===----------------------------------------------------------------------===//
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/// TerminatorInst - Subclasses of this class are all able to terminate a basic
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/// block. Thus, these are all the flow control type of operations.
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///
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class TerminatorInst : public Instruction {
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protected:
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TerminatorInst(Instruction::TermOps iType, Use *Ops, unsigned NumOps,
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Instruction *InsertBefore = 0);
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TerminatorInst(const Type *Ty, Instruction::TermOps iType,
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Use *Ops, unsigned NumOps,
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const std::string &Name = "", Instruction *InsertBefore = 0)
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: Instruction(Ty, iType, Ops, NumOps, Name, InsertBefore) {}
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TerminatorInst(Instruction::TermOps iType, Use *Ops, unsigned NumOps,
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BasicBlock *InsertAtEnd);
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TerminatorInst(const Type *Ty, Instruction::TermOps iType,
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Use *Ops, unsigned NumOps,
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const std::string &Name, BasicBlock *InsertAtEnd)
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: Instruction(Ty, iType, Ops, NumOps, Name, InsertAtEnd) {}
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// Out of line virtual method, so the vtable, etc has a home.
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~TerminatorInst();
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/// Virtual methods - Terminators should overload these and provide inline
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/// overrides of non-V methods.
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virtual BasicBlock *getSuccessorV(unsigned idx) const = 0;
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virtual unsigned getNumSuccessorsV() const = 0;
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virtual void setSuccessorV(unsigned idx, BasicBlock *B) = 0;
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public:
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virtual Instruction *clone() const = 0;
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/// getNumSuccessors - Return the number of successors that this terminator
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/// has.
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unsigned getNumSuccessors() const {
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return getNumSuccessorsV();
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}
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/// getSuccessor - Return the specified successor.
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///
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BasicBlock *getSuccessor(unsigned idx) const {
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return getSuccessorV(idx);
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}
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/// setSuccessor - Update the specified successor to point at the provided
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/// block.
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void setSuccessor(unsigned idx, BasicBlock *B) {
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setSuccessorV(idx, B);
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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 TerminatorInst *) { return true; }
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static inline bool classof(const Instruction *I) {
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return I->getOpcode() >= TermOpsBegin && I->getOpcode() < TermOpsEnd;
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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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}
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};
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//===----------------------------------------------------------------------===//
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// UnaryInstruction Class
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//===----------------------------------------------------------------------===//
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class UnaryInstruction : public Instruction {
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Use Op;
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protected:
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UnaryInstruction(const Type *Ty, unsigned iType, Value *V,
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const std::string &Name = "", Instruction *IB = 0)
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: Instruction(Ty, iType, &Op, 1, Name, IB), Op(V, this) {
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}
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UnaryInstruction(const Type *Ty, unsigned iType, Value *V,
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const std::string &Name, BasicBlock *IAE)
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: Instruction(Ty, iType, &Op, 1, Name, IAE), Op(V, this) {
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}
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public:
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// Out of line virtual method, so the vtable, etc has a home.
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~UnaryInstruction();
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// Transparently provide more efficient getOperand methods.
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Value *getOperand(unsigned i) const {
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assert(i == 0 && "getOperand() out of range!");
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return Op;
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}
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void setOperand(unsigned i, Value *Val) {
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assert(i == 0 && "setOperand() out of range!");
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Op = Val;
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}
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unsigned getNumOperands() const { return 1; }
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};
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//===----------------------------------------------------------------------===//
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// BinaryOperator Class
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//===----------------------------------------------------------------------===//
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class BinaryOperator : public Instruction {
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Use Ops[2];
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protected:
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void init(BinaryOps iType);
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BinaryOperator(BinaryOps iType, Value *S1, Value *S2, const Type *Ty,
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const std::string &Name, Instruction *InsertBefore)
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: Instruction(Ty, iType, Ops, 2, Name, InsertBefore) {
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Ops[0].init(S1, this);
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Ops[1].init(S2, this);
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init(iType);
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}
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BinaryOperator(BinaryOps iType, Value *S1, Value *S2, const Type *Ty,
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const std::string &Name, BasicBlock *InsertAtEnd)
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: Instruction(Ty, iType, Ops, 2, Name, InsertAtEnd) {
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Ops[0].init(S1, this);
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Ops[1].init(S2, this);
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init(iType);
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}
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public:
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/// Transparently provide more efficient getOperand methods.
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Value *getOperand(unsigned i) const {
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assert(i < 2 && "getOperand() out of range!");
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return Ops[i];
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}
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void setOperand(unsigned i, Value *Val) {
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assert(i < 2 && "setOperand() out of range!");
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Ops[i] = Val;
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}
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unsigned getNumOperands() const { return 2; }
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/// create() - Construct a binary instruction, given the opcode and the two
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/// operands. Optionally (if InstBefore is specified) insert the instruction
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/// into a BasicBlock right before the specified instruction. The specified
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/// Instruction is allowed to be a dereferenced end iterator.
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///
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static BinaryOperator *create(BinaryOps Op, Value *S1, Value *S2,
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const std::string &Name = "",
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Instruction *InsertBefore = 0);
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/// create() - Construct a binary instruction, given the opcode and the two
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/// operands. Also automatically insert this instruction to the end of the
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/// BasicBlock specified.
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///
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static BinaryOperator *create(BinaryOps Op, Value *S1, Value *S2,
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const std::string &Name,
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BasicBlock *InsertAtEnd);
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/// create* - These methods just forward to create, and are useful when you
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/// statically know what type of instruction you're going to create. These
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/// helpers just save some typing.
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#define HANDLE_BINARY_INST(N, OPC, CLASS) \
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static BinaryOperator *create##OPC(Value *V1, Value *V2, \
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const std::string &Name = "") {\
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return create(Instruction::OPC, V1, V2, Name);\
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}
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#include "llvm/Instruction.def"
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#define HANDLE_BINARY_INST(N, OPC, CLASS) \
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static BinaryOperator *create##OPC(Value *V1, Value *V2, \
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const std::string &Name, BasicBlock *BB) {\
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return create(Instruction::OPC, V1, V2, Name, BB);\
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}
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#include "llvm/Instruction.def"
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#define HANDLE_BINARY_INST(N, OPC, CLASS) \
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static BinaryOperator *create##OPC(Value *V1, Value *V2, \
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const std::string &Name, Instruction *I) {\
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return create(Instruction::OPC, V1, V2, Name, I);\
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}
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#include "llvm/Instruction.def"
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/// Helper functions to construct and inspect unary operations (NEG and NOT)
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/// via binary operators SUB and XOR:
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///
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/// createNeg, createNot - Create the NEG and NOT
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/// instructions out of SUB and XOR instructions.
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///
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static BinaryOperator *createNeg(Value *Op, const std::string &Name = "",
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Instruction *InsertBefore = 0);
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static BinaryOperator *createNeg(Value *Op, const std::string &Name,
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BasicBlock *InsertAtEnd);
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static BinaryOperator *createNot(Value *Op, const std::string &Name = "",
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Instruction *InsertBefore = 0);
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static BinaryOperator *createNot(Value *Op, const std::string &Name,
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BasicBlock *InsertAtEnd);
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/// isNeg, isNot - Check if the given Value is a NEG or NOT instruction.
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///
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static bool isNeg(const Value *V);
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static bool isNot(const Value *V);
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/// getNegArgument, getNotArgument - Helper functions to extract the
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/// unary argument of a NEG or NOT operation implemented via Sub or Xor.
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///
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static const Value *getNegArgument(const Value *BinOp);
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static Value *getNegArgument( Value *BinOp);
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static const Value *getNotArgument(const Value *BinOp);
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static Value *getNotArgument( Value *BinOp);
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BinaryOps getOpcode() const {
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return static_cast<BinaryOps>(Instruction::getOpcode());
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}
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virtual BinaryOperator *clone() const;
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/// swapOperands - Exchange the two operands to this instruction.
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/// This instruction is safe to use on any binary instruction and
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/// does not modify the semantics of the instruction. If the
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/// instruction is order dependent (SetLT f.e.) the opcode is
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/// changed. If the instruction cannot be reversed (ie, it's a Div),
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/// then return true.
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///
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bool swapOperands();
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const BinaryOperator *) { return true; }
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static inline bool classof(const Instruction *I) {
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return I->getOpcode() >= BinaryOpsBegin && I->getOpcode() < BinaryOpsEnd;
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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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}
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};
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//===----------------------------------------------------------------------===//
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// CastInst Class
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//===----------------------------------------------------------------------===//
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/// CastInst - This is the base class for all instructions that perform data
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/// casts. It is simply provided so that instruction category testing
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/// can be performed with code like:
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///
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/// if (isa<CastInst>(Instr)) { ... }
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/// @brief Base class of casting instructions.
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class CastInst : public UnaryInstruction {
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/// @brief Copy constructor
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CastInst(const CastInst &CI)
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: UnaryInstruction(CI.getType(), CI.getOpcode(), CI.getOperand(0)) {
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}
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/// @brief Do not allow default construction
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CastInst();
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protected:
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/// @brief Constructor with insert-before-instruction semantics for subclasses
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CastInst(const Type *Ty, unsigned iType, Value *S,
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const std::string &Name = "", Instruction *InsertBefore = 0)
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: UnaryInstruction(Ty, iType, S, Name, InsertBefore) {
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}
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/// @brief Constructor with insert-at-end-of-block semantics for subclasses
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CastInst(const Type *Ty, unsigned iType, Value *S,
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const std::string &Name, BasicBlock *InsertAtEnd)
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: UnaryInstruction(Ty, iType, S, Name, InsertAtEnd) {
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}
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public:
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/// Provides a way to construct any of the CastInst subclasses using an
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/// opcode instead of the subclass's constructor. The opcode must be in the
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/// CastOps category (Instruction::isCast(opcode) returns true). This
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/// constructor has insert-before-instruction semantics to automatically
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/// insert the new CastInst before InsertBefore (if it is non-null).
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/// @brief Construct any of the CastInst subclasses
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static CastInst *create(
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Instruction::CastOps, ///< The opcode of the cast instruction
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Value *S, ///< The value to be casted (operand 0)
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const Type *Ty, ///< The type to which cast should be made
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const std::string &Name = "", ///< Name for the instruction
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Instruction *InsertBefore = 0 ///< Place to insert the instruction
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);
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/// Provides a way to construct any of the CastInst subclasses using an
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/// opcode instead of the subclass's constructor. The opcode must be in the
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/// CastOps category. This constructor has insert-at-end-of-block semantics
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/// to automatically insert the new CastInst at the end of InsertAtEnd (if
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/// its non-null).
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/// @brief Construct any of the CastInst subclasses
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static CastInst *create(
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Instruction::CastOps, ///< The opcode for the cast instruction
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Value *S, ///< The value to be casted (operand 0)
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const Type *Ty, ///< The type to which operand is casted
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const std::string &Name, ///< The name for the instruction
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BasicBlock *InsertAtEnd ///< The block to insert the instruction into
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);
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/// Returns the opcode necessary to cast Val into Ty using usual casting
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/// rules.
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static Instruction::CastOps getCastOpcode(
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const Value *Val, ///< The value to cast
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bool SrcIsSigned, ///< Whether to treat the source as signed
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const Type *Ty, ///< The Type to which the value should be casted
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bool DstIsSigned ///< Whether to treate the dest. as signed
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);
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/// Joins the create method (with insert-before-instruction semantics) above
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/// with the getCastOpcode method. getOpcode(S,Ty) is called first to
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/// obtain the opcode for casting S to type Ty. Then the get(...) method is
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/// called to create the CastInst and insert it. The instruction is
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/// inserted before InsertBefore (if it is non-null). The cast created is
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/// inferred, because only the types involved are used in determining which
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/// cast opcode to use. For specific casts, use one of the create methods.
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/// @brief Inline helper method to join create with getCastOpcode.
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inline static CastInst *createInferredCast(
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Value *S, ///< The value to be casted (operand 0)
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bool SrcIsSigned, ///< Whether to treat the source as signed
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const Type *Ty, ///< Type to which operand should be casted
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bool DstIsSigned, ///< Whether to treate the dest. as signed
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const std::string &Name = "", ///< Name for the instruction
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Instruction *InsertBefore = 0 ///< Place to insert the CastInst
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) {
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return create(getCastOpcode(S, SrcIsSigned, Ty, DstIsSigned),
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S, Ty, Name, InsertBefore);
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}
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static CastInst *createInferredCast(
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Value *S, ///< The value to be casted (operand 0)
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const Type *Ty, ///< Type to which operand should be casted
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const std::string &Name = "", ///< Name for the instruction
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Instruction *InsertBefore = 0 ///< Place to insert the CastInst
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);
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/// Joins the get method (with insert-at-end-of-block semantics) method
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/// above with the getCastOpcode method. getOpcode(S,Ty) is called first to
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/// obtain the usual casting opcode for casting S to type Ty. Then the
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/// get(...) method is called to create the CastInst and insert it. The
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/// instruction is inserted at the end of InsertAtEnd (if it is non-null).
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/// The created cast is inferred, because only the types involved are used
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/// in determining which cast opcode to use. For specific casts, use one of
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/// the create methods.
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/// @brief Inline helper method to join create with getCastOpcode.
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inline static CastInst *createInferredCast(
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Value *S, ///< The value to be casted (operand 0)
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bool SrcIsSigned, ///< Whether to treat the source as signed
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const Type *Ty, ///< Type to which operand should be casted
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bool DstIsSigned, ///< Whether to treate the dest. as signed
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const std::string &Name, ///< Name for the instruction
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BasicBlock *InsertAtEnd ///< The block to insert the instruction into
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) {
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return create(getCastOpcode(S, SrcIsSigned, Ty, DstIsSigned),
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S, Ty, Name, InsertAtEnd);
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}
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static CastInst *createInferredCast(
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Value *S, ///< The value to be casted (operand 0)
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const Type *Ty, ///< Type to which operand should be casted
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const std::string &Name, ///< Name for the instruction
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BasicBlock *InsertAtEnd ///< The block to insert the instruction into
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);
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/// There are several places where we need to know if a cast instruction
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/// only deals with integer source and destination types. To simplify that
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/// logic, this method is provided.
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/// @returns true iff the cast has only integral typed operand and dest type.
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/// @brief Determine if this is an integer-only cast.
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bool isIntegerCast() const;
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/// A lossless cast is one that does not alter the basic value. It implies
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/// a no-op cast but is more stringent, preventing things like int->float,
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/// long->double, int->ptr, or packed->anything.
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/// @returns true iff the cast is lossless.
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/// @brief Determine if this is a lossless cast.
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bool isLosslessCast() const;
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/// A no-op cast is one that can be effected without changing any bits.
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/// It implies that the source and destination types are the same size. The
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/// IntPtrTy argument is used to make accurate determinations for casts
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/// involving Integer and Pointer types. They are no-op casts if the integer
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/// is the same size as the pointer. However, pointer size varies with
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/// platform. Generally, the result of TargetData::getIntPtrType() should be
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/// passed in. If that's not available, use Type::ULongTy, which will make
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/// the isNoopCast call conservative.
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/// @brief Determine if this cast is a no-op cast.
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bool isNoopCast(
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const Type *IntPtrTy ///< Integer type corresponding to pointer
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) const;
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/// Determine how a pair of casts can be eliminated, if they can be at all.
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/// This is a helper function for both CastInst and ConstantExpr.
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/// @returns 0 if the CastInst pair can't be eliminated
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/// @returns Instruction::CastOps value for a cast that can replace
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/// the pair, casting SrcTy to DstTy.
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/// @brief Determine if a cast pair is eliminable
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static unsigned isEliminableCastPair(
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Instruction::CastOps firstOpcode, ///< Opcode of first cast
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Instruction::CastOps secondOpcode, ///< Opcode of second cast
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const Type *SrcTy, ///< SrcTy of 1st cast
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const Type *MidTy, ///< DstTy of 1st cast & SrcTy of 2nd cast
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const Type *DstTy, ///< DstTy of 2nd cast
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const Type *IntPtrTy ///< Integer type corresponding to Ptr types
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);
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/// @brief Return the opcode of this CastInst
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Instruction::CastOps getOpcode() const {
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return Instruction::CastOps(Instruction::getOpcode());
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}
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/// @brief Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const CastInst *) { return true; }
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static inline bool classof(const Instruction *I) {
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return I->getOpcode() >= CastOpsBegin && I->getOpcode() < CastOpsEnd;
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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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}
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};
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//===----------------------------------------------------------------------===//
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// CmpInst Class
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//===----------------------------------------------------------------------===//
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/// This class is the base class for the comparison instructions.
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/// @brief Abstract base class of comparison instructions.
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class CmpInst: public Instruction {
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CmpInst(); // do not implement
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protected:
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CmpInst(Instruction::OtherOps op, unsigned short pred, Value *LHS, Value *RHS,
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const std::string &Name = "", Instruction *InsertBefore = 0);
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CmpInst(Instruction::OtherOps op, unsigned short pred, Value *LHS, Value *RHS,
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const std::string &Name, BasicBlock *InsertAtEnd);
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Use Ops[2]; // CmpInst instructions always have 2 operands, optimize
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public:
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/// Construct a compare instruction, given the opcode, the predicate and
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/// the two operands. Optionally (if InstBefore is specified) insert the
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/// instruction into a BasicBlock right before the specified instruction.
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/// The specified Instruction is allowed to be a dereferenced end iterator.
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/// @brief Create a CmpInst
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static CmpInst *create(OtherOps Op, unsigned short predicate, Value *S1,
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Value *S2, const std::string &Name = "",
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Instruction *InsertBefore = 0);
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/// Construct a compare instruction, given the opcode, the predicate and the
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/// two operands. Also automatically insert this instruction to the end of
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/// the BasicBlock specified.
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/// @brief Create a CmpInst
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static CmpInst *create(OtherOps Op, unsigned short predicate, Value *S1,
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Value *S2, const std::string &Name,
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BasicBlock *InsertAtEnd);
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/// @brief Implement superclass method.
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virtual CmpInst *clone() const;
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/// The predicate for CmpInst is defined by the subclasses but stored in
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/// the SubclassData field (see Value.h). We allow it to be fetched here
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/// as the predicate but there is no enum type for it, just the raw unsigned
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/// short. This facilitates comparison of CmpInst instances without delving
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/// into the subclasses since predicate values are distinct between the
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/// CmpInst subclasses.
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/// @brief Return the predicate for this instruction.
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unsigned short getPredicate() const {
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return SubclassData;
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}
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/// @brief Provide more efficient getOperand methods.
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Value *getOperand(unsigned i) const {
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assert(i < 2 && "getOperand() out of range!");
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return Ops[i];
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}
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void setOperand(unsigned i, Value *Val) {
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assert(i < 2 && "setOperand() out of range!");
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Ops[i] = Val;
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}
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/// @brief CmpInst instructions always have 2 operands.
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unsigned getNumOperands() const { return 2; }
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/// This is just a convenience that dispatches to the subclasses.
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/// @brief Swap the operands.
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void swapOperands();
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/// This is just a convenience that dispatches to the subclasses.
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/// @brief Determine if this CmpInst is commutative.
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bool isCommutative();
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/// This is just a convenience that dispatches to the subclasses.
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/// @brief Determine if this is an equals/not equals predicate.
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bool isEquality();
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/// @brief Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const CmpInst *) { return true; }
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static inline bool classof(const Instruction *I) {
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return I->getOpcode() == Instruction::ICmp ||
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I->getOpcode() == Instruction::FCmp;
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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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}
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};
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} // End llvm namespace
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#endif
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