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848414e49c
expressions. These will get used to reduce clutter as we replace various calls to createInferredCast and getCast. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32191 91177308-0d34-0410-b5e6-96231b3b80d8
558 lines
24 KiB
C++
558 lines
24 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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/// @brief Create a ZExt or BitCast cast instruction
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static CastInst *createZExtOrBitCast(
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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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/// @brief Create a ZExt or BitCast cast instruction
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static CastInst *createZExtOrBitCast(
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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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/// @brief Create a SExt or BitCast cast instruction
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static CastInst *createSExtOrBitCast(
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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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/// @brief Create a SExt or BitCast cast instruction
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static CastInst *createSExtOrBitCast(
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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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/// @brief Create a Trunc or BitCast cast instruction
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static CastInst *createTruncOrBitCast(
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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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/// @brief Create a Trunc or BitCast cast instruction
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static CastInst *createTruncOrBitCast(
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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
|
|
const Type *IntPtrTy ///< Integer type corresponding to Ptr types
|
|
);
|
|
|
|
/// @brief Return the opcode of this CastInst
|
|
Instruction::CastOps getOpcode() const {
|
|
return Instruction::CastOps(Instruction::getOpcode());
|
|
}
|
|
|
|
/// @brief Methods for support type inquiry through isa, cast, and dyn_cast:
|
|
static inline bool classof(const CastInst *) { return true; }
|
|
static inline bool classof(const Instruction *I) {
|
|
return I->getOpcode() >= CastOpsBegin && I->getOpcode() < CastOpsEnd;
|
|
}
|
|
static inline bool classof(const Value *V) {
|
|
return isa<Instruction>(V) && classof(cast<Instruction>(V));
|
|
}
|
|
};
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// CmpInst Class
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// This class is the base class for the comparison instructions.
|
|
/// @brief Abstract base class of comparison instructions.
|
|
class CmpInst: public Instruction {
|
|
CmpInst(); // do not implement
|
|
protected:
|
|
CmpInst(Instruction::OtherOps op, unsigned short pred, Value *LHS, Value *RHS,
|
|
const std::string &Name = "", Instruction *InsertBefore = 0);
|
|
|
|
CmpInst(Instruction::OtherOps op, unsigned short pred, Value *LHS, Value *RHS,
|
|
const std::string &Name, BasicBlock *InsertAtEnd);
|
|
|
|
Use Ops[2]; // CmpInst instructions always have 2 operands, optimize
|
|
|
|
public:
|
|
/// Construct a compare instruction, given the opcode, the predicate and
|
|
/// the two operands. Optionally (if InstBefore is specified) insert the
|
|
/// instruction into a BasicBlock right before the specified instruction.
|
|
/// The specified Instruction is allowed to be a dereferenced end iterator.
|
|
/// @brief Create a CmpInst
|
|
static CmpInst *create(OtherOps Op, unsigned short predicate, Value *S1,
|
|
Value *S2, const std::string &Name = "",
|
|
Instruction *InsertBefore = 0);
|
|
|
|
/// Construct a compare instruction, given the opcode, the predicate and the
|
|
/// two operands. Also automatically insert this instruction to the end of
|
|
/// the BasicBlock specified.
|
|
/// @brief Create a CmpInst
|
|
static CmpInst *create(OtherOps Op, unsigned short predicate, Value *S1,
|
|
Value *S2, const std::string &Name,
|
|
BasicBlock *InsertAtEnd);
|
|
|
|
/// @brief Implement superclass method.
|
|
virtual CmpInst *clone() const;
|
|
|
|
/// The predicate for CmpInst is defined by the subclasses but stored in
|
|
/// the SubclassData field (see Value.h). We allow it to be fetched here
|
|
/// as the predicate but there is no enum type for it, just the raw unsigned
|
|
/// short. This facilitates comparison of CmpInst instances without delving
|
|
/// into the subclasses since predicate values are distinct between the
|
|
/// CmpInst subclasses.
|
|
/// @brief Return the predicate for this instruction.
|
|
unsigned short getPredicate() const {
|
|
return SubclassData;
|
|
}
|
|
|
|
/// @brief Provide more efficient getOperand methods.
|
|
Value *getOperand(unsigned i) const {
|
|
assert(i < 2 && "getOperand() out of range!");
|
|
return Ops[i];
|
|
}
|
|
void setOperand(unsigned i, Value *Val) {
|
|
assert(i < 2 && "setOperand() out of range!");
|
|
Ops[i] = Val;
|
|
}
|
|
|
|
/// @brief CmpInst instructions always have 2 operands.
|
|
unsigned getNumOperands() const { return 2; }
|
|
|
|
/// This is just a convenience that dispatches to the subclasses.
|
|
/// @brief Swap the operands.
|
|
void swapOperands();
|
|
|
|
/// This is just a convenience that dispatches to the subclasses.
|
|
/// @brief Determine if this CmpInst is commutative.
|
|
bool isCommutative();
|
|
|
|
/// This is just a convenience that dispatches to the subclasses.
|
|
/// @brief Determine if this is an equals/not equals predicate.
|
|
bool isEquality();
|
|
|
|
/// @brief Methods for support type inquiry through isa, cast, and dyn_cast:
|
|
static inline bool classof(const CmpInst *) { return true; }
|
|
static inline bool classof(const Instruction *I) {
|
|
return I->getOpcode() == Instruction::ICmp ||
|
|
I->getOpcode() == Instruction::FCmp;
|
|
}
|
|
static inline bool classof(const Value *V) {
|
|
return isa<Instruction>(V) && classof(cast<Instruction>(V));
|
|
}
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|