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whether it is used outside of some block. This can be used to see if there are any non-local references, for example. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50004 91177308-0d34-0410-b5e6-96231b3b80d8
239 lines
8.5 KiB
C++
239 lines
8.5 KiB
C++
//===-- llvm/Instruction.h - Instruction class definition -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the declaration of the Instruction class, which is the
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// base class for all of the LLVM instructions.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_INSTRUCTION_H
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#define LLVM_INSTRUCTION_H
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#include "llvm/User.h"
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namespace llvm {
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struct AssemblyAnnotationWriter;
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class BinaryOperator;
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template<typename ValueSubClass, typename ItemParentClass>
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class SymbolTableListTraits;
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class Instruction : public User {
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void operator=(const Instruction &); // Do not implement
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Instruction(const Instruction &); // Do not implement
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BasicBlock *Parent;
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Instruction *Prev, *Next; // Next and Prev links for our intrusive linked list
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void setNext(Instruction *N) { Next = N; }
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void setPrev(Instruction *N) { Prev = N; }
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friend class SymbolTableListTraits<Instruction, BasicBlock>;
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void setParent(BasicBlock *P);
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protected:
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Instruction(const Type *Ty, unsigned iType, Use *Ops, unsigned NumOps,
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Instruction *InsertBefore = 0);
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Instruction(const Type *Ty, unsigned iType, Use *Ops, unsigned NumOps,
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BasicBlock *InsertAtEnd);
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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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~Instruction();
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/// mayWriteToMemory - Return true if this instruction may modify memory.
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///
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bool mayWriteToMemory() const;
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/// clone() - Create a copy of 'this' instruction that is identical in all
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/// ways except the following:
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/// * The instruction has no parent
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/// * The instruction has no name
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///
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virtual Instruction *clone() const = 0;
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/// isIdenticalTo - Return true if the specified instruction is exactly
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/// identical to the current one. This means that all operands match and any
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/// extra information (e.g. load is volatile) agree.
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bool isIdenticalTo(Instruction *I) const;
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/// This function determines if the specified instruction executes the same
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/// operation as the current one. This means that the opcodes, type, operand
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/// types and any other factors affecting the operation must be the same. This
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/// is similar to isIdenticalTo except the operands themselves don't have to
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/// be identical.
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/// @returns true if the specified instruction is the same operation as
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/// the current one.
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/// @brief Determine if one instruction is the same operation as another.
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bool isSameOperationAs(Instruction *I) const;
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/// isUsedOutsideOfBlock - Return true if there are any uses of this
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/// instruction in blocks other than the specified block. Note that PHI nodes
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/// are considered to evaluate their operands in the corresponding predecessor
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/// block.
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bool isUsedOutsideOfBlock(const BasicBlock *BB) const;
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/// use_back - Specialize the methods defined in Value, as we know that an
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/// instruction can only be used by other instructions.
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Instruction *use_back() { return cast<Instruction>(*use_begin());}
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const Instruction *use_back() const { return cast<Instruction>(*use_begin());}
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// Accessor methods...
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//
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inline const BasicBlock *getParent() const { return Parent; }
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inline BasicBlock *getParent() { return Parent; }
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/// removeFromParent - This method unlinks 'this' from the containing basic
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/// block, but does not delete it.
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///
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void removeFromParent();
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/// eraseFromParent - This method unlinks 'this' from the containing basic
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/// block and deletes it.
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///
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void eraseFromParent();
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/// moveBefore - Unlink this instruction from its current basic block and
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/// insert it into the basic block that MovePos lives in, right before
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/// MovePos.
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void moveBefore(Instruction *MovePos);
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// ---------------------------------------------------------------------------
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/// Subclass classification... getOpcode() returns a member of
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/// one of the enums that is coming soon (down below)...
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///
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unsigned getOpcode() const { return getValueID() - InstructionVal; }
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const char *getOpcodeName() const { return getOpcodeName(getOpcode()); }
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bool isTerminator() const { return isTerminator(getOpcode()); }
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bool isBinaryOp() const { return isBinaryOp(getOpcode()); }
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bool isShift() { return isShift(getOpcode()); }
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bool isCast() const { return isCast(getOpcode()); }
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static const char* getOpcodeName(unsigned OpCode);
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static inline bool isTerminator(unsigned OpCode) {
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return OpCode >= TermOpsBegin && OpCode < TermOpsEnd;
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}
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static inline bool isBinaryOp(unsigned Opcode) {
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return Opcode >= BinaryOpsBegin && Opcode < BinaryOpsEnd;
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}
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/// @brief Determine if the Opcode is one of the shift instructions.
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static inline bool isShift(unsigned Opcode) {
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return Opcode >= Shl && Opcode <= AShr;
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}
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/// isLogicalShift - Return true if this is a logical shift left or a logical
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/// shift right.
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inline bool isLogicalShift() const {
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return getOpcode() == Shl || getOpcode() == LShr;
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}
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/// isLogicalShift - Return true if this is a logical shift left or a logical
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/// shift right.
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inline bool isArithmeticShift() const {
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return getOpcode() == AShr;
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}
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/// @brief Determine if the OpCode is one of the CastInst instructions.
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static inline bool isCast(unsigned OpCode) {
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return OpCode >= CastOpsBegin && OpCode < CastOpsEnd;
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}
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/// isAssociative - Return true if the instruction is associative:
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///
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/// Associative operators satisfy: x op (y op z) === (x op y) op z
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///
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/// In LLVM, the Add, Mul, And, Or, and Xor operators are associative, when
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/// not applied to floating point types.
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///
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bool isAssociative() const { return isAssociative(getOpcode(), getType()); }
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static bool isAssociative(unsigned op, const Type *Ty);
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/// isCommutative - Return true if the instruction is commutative:
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///
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/// Commutative operators satisfy: (x op y) === (y op x)
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///
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/// In LLVM, these are the associative operators, plus SetEQ and SetNE, when
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/// applied to any type.
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///
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bool isCommutative() const { return isCommutative(getOpcode()); }
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static bool isCommutative(unsigned op);
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/// isTrappingInstruction - Return true if the instruction may trap.
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///
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bool isTrapping() const {
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return isTrapping(getOpcode());
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}
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static bool isTrapping(unsigned op);
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virtual void print(std::ostream &OS) const { print(OS, 0); }
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void print(std::ostream *OS) const { if (OS) print(*OS); }
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void print(std::ostream &OS, AssemblyAnnotationWriter *AAW) const;
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/// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const Instruction *) { return true; }
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static inline bool classof(const Value *V) {
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return V->getValueID() >= Value::InstructionVal;
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}
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//----------------------------------------------------------------------
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// Exported enumerations...
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//
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enum TermOps { // These terminate basic blocks
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#define FIRST_TERM_INST(N) TermOpsBegin = N,
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#define HANDLE_TERM_INST(N, OPC, CLASS) OPC = N,
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#define LAST_TERM_INST(N) TermOpsEnd = N+1
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#include "llvm/Instruction.def"
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};
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enum BinaryOps {
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#define FIRST_BINARY_INST(N) BinaryOpsBegin = N,
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#define HANDLE_BINARY_INST(N, OPC, CLASS) OPC = N,
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#define LAST_BINARY_INST(N) BinaryOpsEnd = N+1
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#include "llvm/Instruction.def"
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};
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enum MemoryOps {
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#define FIRST_MEMORY_INST(N) MemoryOpsBegin = N,
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#define HANDLE_MEMORY_INST(N, OPC, CLASS) OPC = N,
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#define LAST_MEMORY_INST(N) MemoryOpsEnd = N+1
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#include "llvm/Instruction.def"
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};
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enum CastOps {
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#define FIRST_CAST_INST(N) CastOpsBegin = N,
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#define HANDLE_CAST_INST(N, OPC, CLASS) OPC = N,
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#define LAST_CAST_INST(N) CastOpsEnd = N+1
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#include "llvm/Instruction.def"
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};
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enum OtherOps {
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#define FIRST_OTHER_INST(N) OtherOpsBegin = N,
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#define HANDLE_OTHER_INST(N, OPC, CLASS) OPC = N,
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#define LAST_OTHER_INST(N) OtherOpsEnd = N+1
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#include "llvm/Instruction.def"
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};
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private:
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// getNext/Prev - Return the next or previous instruction in the list. The
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// last node in the list is a terminator instruction.
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Instruction *getNext() { return Next; }
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const Instruction *getNext() const { return Next; }
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Instruction *getPrev() { return Prev; }
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const Instruction *getPrev() const { return Prev; }
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};
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} // End llvm namespace
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#endif
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