//===-- llvm/Instruction.h - Instruction class definition -------*- C++ -*-===//
-//
+//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
//===----------------------------------------------------------------------===//
//
// This file contains the declaration of the Instruction class, which is the
#define LLVM_INSTRUCTION_H
#include "llvm/User.h"
+#include "llvm/ADT/ilist_node.h"
namespace llvm {
-struct AssemblyAnnotationWriter;
-class BinaryOperator;
+class LLVMContext;
-template<typename SC> struct ilist_traits;
-template<typename ValueSubClass, typename ItemParentClass, typename SymTabClass,
- typename SubClass> class SymbolTableListTraits;
+template<typename ValueSubClass, typename ItemParentClass>
+ class SymbolTableListTraits;
-class Instruction : public User {
- BasicBlock *Parent;
- Instruction *Prev, *Next; // Next and Prev links for our intrusive linked list
+class Instruction : public User, public ilist_node<Instruction> {
+ void operator=(const Instruction &); // Do not implement
+ Instruction(const Instruction &); // Do not implement
- void setNext(Instruction *N) { Next = N; }
- void setPrev(Instruction *N) { Prev = N; }
+ BasicBlock *Parent;
- friend class SymbolTableListTraits<Instruction, BasicBlock, Function,
- ilist_traits<Instruction> >;
+ friend class SymbolTableListTraits<Instruction, BasicBlock>;
void setParent(BasicBlock *P);
- void init();
-
-private:
- // FIXME: This is a dirty hack. Setcc instructions shouldn't encode the CC
- // into the opcode field. When they don't, this will be unneeded.
- void setOpcode(unsigned NewOpcode);
- friend class BinaryOperator;
protected:
- Instruction(const Type *Ty, unsigned iType, const std::string &Name = "",
+ Instruction(const Type *Ty, unsigned iType, Use *Ops, unsigned NumOps,
Instruction *InsertBefore = 0);
- Instruction(const Type *Ty, unsigned iType, const std::string &Name,
+ Instruction(const Type *Ty, unsigned iType, Use *Ops, unsigned NumOps,
BasicBlock *InsertAtEnd);
public:
-
- ~Instruction() {
- assert(Parent == 0 && "Instruction still linked in the program!");
- }
-
- // Specialize setName to handle symbol table majik...
- virtual void setName(const std::string &name, SymbolTable *ST = 0);
+ // Out of line virtual method, so the vtable, etc has a home.
+ ~Instruction();
/// clone() - Create a copy of 'this' instruction that is identical in all
/// ways except the following:
/// * The instruction has no parent
/// * The instruction has no name
///
- virtual Instruction *clone() const = 0;
+ virtual Instruction *clone(LLVMContext &Context) const = 0;
+
+ /// isIdenticalTo - Return true if the specified instruction is exactly
+ /// identical to the current one. This means that all operands match and any
+ /// extra information (e.g. load is volatile) agree.
+ bool isIdenticalTo(const Instruction *I) const;
+
+ /// isIdenticalToWhenDefined - This is like isIdenticalTo, except that it
+ /// ignores the SubclassOptionalData flags, which specify conditions
+ /// under which the instruction's result is undefined.
+ bool isIdenticalToWhenDefined(const Instruction *I) const;
+
+ /// This function determines if the specified instruction executes the same
+ /// operation as the current one. This means that the opcodes, type, operand
+ /// types and any other factors affecting the operation must be the same. This
+ /// is similar to isIdenticalTo except the operands themselves don't have to
+ /// be identical.
+ /// @returns true if the specified instruction is the same operation as
+ /// the current one.
+ /// @brief Determine if one instruction is the same operation as another.
+ bool isSameOperationAs(const Instruction *I) const;
+
+ /// isUsedOutsideOfBlock - Return true if there are any uses of this
+ /// instruction in blocks other than the specified block. Note that PHI nodes
+ /// are considered to evaluate their operands in the corresponding predecessor
+ /// block.
+ bool isUsedOutsideOfBlock(const BasicBlock *BB) const;
+
+
+ /// use_back - Specialize the methods defined in Value, as we know that an
+ /// instruction can only be used by other instructions.
+ Instruction *use_back() { return cast<Instruction>(*use_begin());}
+ const Instruction *use_back() const { return cast<Instruction>(*use_begin());}
// Accessor methods...
//
inline const BasicBlock *getParent() const { return Parent; }
inline BasicBlock *getParent() { return Parent; }
- // getNext/Prev - Return the next or previous instruction in the list. The
- // last node in the list is a terminator instruction.
- Instruction *getNext() { return Next; }
- const Instruction *getNext() const { return Next; }
- Instruction *getPrev() { return Prev; }
- const Instruction *getPrev() const { return Prev; }
+ /// removeFromParent - This method unlinks 'this' from the containing basic
+ /// block, but does not delete it.
+ ///
+ void removeFromParent();
- /// mayWriteToMemory - Return true if this instruction may modify memory.
+ /// eraseFromParent - This method unlinks 'this' from the containing basic
+ /// block and deletes it.
///
- virtual bool mayWriteToMemory() const { return false; }
+ void eraseFromParent();
+
+ /// insertBefore - Insert an unlinked instructions into a basic block
+ /// immediately before the specified instruction.
+ void insertBefore(Instruction *InsertPos);
+
+ /// insertAfter - Insert an unlinked instructions into a basic block
+ /// immediately after the specified instruction.
+ void insertAfter(Instruction *InsertPos);
+
+ /// moveBefore - Unlink this instruction from its current basic block and
+ /// insert it into the basic block that MovePos lives in, right before
+ /// MovePos.
+ void moveBefore(Instruction *MovePos);
// ---------------------------------------------------------------------------
- /// Subclass classification... getOpcode() returns a member of
+ /// Subclass classification... getOpcode() returns a member of
/// one of the enums that is coming soon (down below)...
///
- unsigned getOpcode() const { return getValueType() - InstructionVal; }
- virtual const char *getOpcodeName() const {
- return getOpcodeName(getOpcode());
- }
+ unsigned getOpcode() const { return getValueID() - InstructionVal; }
+ const char *getOpcodeName() const { return getOpcodeName(getOpcode()); }
+ bool isTerminator() const { return isTerminator(getOpcode()); }
+ bool isBinaryOp() const { return isBinaryOp(getOpcode()); }
+ bool isShift() { return isShift(getOpcode()); }
+ bool isCast() const { return isCast(getOpcode()); }
+
+
+
static const char* getOpcodeName(unsigned OpCode);
static inline bool isTerminator(unsigned OpCode) {
return OpCode >= TermOpsBegin && OpCode < TermOpsEnd;
}
- inline bool isTerminator() const { // Instance of TerminatorInst?
- return isTerminator(getOpcode());
+ static inline bool isBinaryOp(unsigned Opcode) {
+ return Opcode >= BinaryOpsBegin && Opcode < BinaryOpsEnd;
}
- inline bool isBinaryOp() const {
- return getOpcode() >= BinaryOpsBegin && getOpcode() < BinaryOpsEnd;
+ /// @brief Determine if the Opcode is one of the shift instructions.
+ static inline bool isShift(unsigned Opcode) {
+ return Opcode >= Shl && Opcode <= AShr;
+ }
+
+ /// isLogicalShift - Return true if this is a logical shift left or a logical
+ /// shift right.
+ inline bool isLogicalShift() const {
+ return getOpcode() == Shl || getOpcode() == LShr;
+ }
+
+ /// isArithmeticShift - Return true if this is an arithmetic shift right.
+ inline bool isArithmeticShift() const {
+ return getOpcode() == AShr;
+ }
+
+ /// @brief Determine if the OpCode is one of the CastInst instructions.
+ static inline bool isCast(unsigned OpCode) {
+ return OpCode >= CastOpsBegin && OpCode < CastOpsEnd;
}
/// isAssociative - Return true if the instruction is associative:
bool isCommutative() const { return isCommutative(getOpcode()); }
static bool isCommutative(unsigned op);
- /// isRelational - Return true if the instruction is a Set* instruction:
+ /// mayWriteToMemory - Return true if this instruction may modify memory.
+ ///
+ bool mayWriteToMemory() const;
+
+ /// mayReadFromMemory - Return true if this instruction may read memory.
///
- bool isRelational() const { return isRelational(getOpcode()); }
- static bool isRelational(unsigned op);
+ bool mayReadFromMemory() const;
+ /// mayThrow - Return true if this instruction may throw an exception.
+ ///
+ bool mayThrow() const;
- /// isTrappingInstruction - Return true if the instruction may trap.
+ /// mayHaveSideEffects - Return true if the instruction may have side effects.
///
- bool isTrapping() const {
- return isTrapping(getOpcode());
+ /// Note that this does not consider malloc and alloca to have side
+ /// effects because the newly allocated memory is completely invisible to
+ /// instructions which don't used the returned value. For cases where this
+ /// matters, isSafeToSpeculativelyExecute may be more appropriate.
+ bool mayHaveSideEffects() const {
+ return mayWriteToMemory() || mayThrow();
}
- static bool isTrapping(unsigned op);
-
- virtual void print(std::ostream &OS) const { print(OS, 0); }
- void print(std::ostream &OS, AssemblyAnnotationWriter *AAW) const;
+
+ /// isSafeToSpeculativelyExecute - Return true if the instruction does not
+ /// have any effects besides calculating the result and does not have
+ /// undefined behavior.
+ ///
+ /// This method never returns true for an instruction that returns true for
+ /// mayHaveSideEffects; however, this method also does some other checks in
+ /// addition. It checks for undefined behavior, like dividing by zero or
+ /// loading from an invalid pointer (but not for undefined results, like a
+ /// shift with a shift amount larger than the width of the result). It checks
+ /// for malloc and alloca because speculatively executing them might cause a
+ /// memory leak. It also returns false for instructions related to control
+ /// flow, specifically terminators and PHI nodes.
+ ///
+ /// This method only looks at the instruction itself and its operands, so if
+ /// this method returns true, it is safe to move the instruction as long as
+ /// the correct dominance relationships for the operands and users hold.
+ /// However, this method can return true for instructions that read memory;
+ /// for such instructions, moving them may change the resulting value.
+ bool isSafeToSpeculativelyExecute() const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
- static inline bool classof(const Instruction *I) { return true; }
+ static inline bool classof(const Instruction *) { return true; }
static inline bool classof(const Value *V) {
- return V->getValueType() >= Value::InstructionVal;
+ return V->getValueID() >= Value::InstructionVal;
}
-
+
//----------------------------------------------------------------------
// Exported enumerations...
//
enum TermOps { // These terminate basic blocks
#define FIRST_TERM_INST(N) TermOpsBegin = N,
#define HANDLE_TERM_INST(N, OPC, CLASS) OPC = N,
-#define LAST_TERM_INST(N) TermOpsEnd = N+1,
+#define LAST_TERM_INST(N) TermOpsEnd = N+1
#include "llvm/Instruction.def"
};
enum BinaryOps {
#define FIRST_BINARY_INST(N) BinaryOpsBegin = N,
#define HANDLE_BINARY_INST(N, OPC, CLASS) OPC = N,
-#define LAST_BINARY_INST(N) BinaryOpsEnd = N+1,
+#define LAST_BINARY_INST(N) BinaryOpsEnd = N+1
#include "llvm/Instruction.def"
};
enum MemoryOps {
#define FIRST_MEMORY_INST(N) MemoryOpsBegin = N,
#define HANDLE_MEMORY_INST(N, OPC, CLASS) OPC = N,
-#define LAST_MEMORY_INST(N) MemoryOpsEnd = N+1,
+#define LAST_MEMORY_INST(N) MemoryOpsEnd = N+1
+#include "llvm/Instruction.def"
+ };
+
+ enum CastOps {
+#define FIRST_CAST_INST(N) CastOpsBegin = N,
+#define HANDLE_CAST_INST(N, OPC, CLASS) OPC = N,
+#define LAST_CAST_INST(N) CastOpsEnd = N+1
#include "llvm/Instruction.def"
};
enum OtherOps {
#define FIRST_OTHER_INST(N) OtherOpsBegin = N,
#define HANDLE_OTHER_INST(N, OPC, CLASS) OPC = N,
-#define LAST_OTHER_INST(N) OtherOpsEnd = N+1,
+#define LAST_OTHER_INST(N) OtherOpsEnd = N+1
#include "llvm/Instruction.def"
};
};
+// Instruction* is only 4-byte aligned.
+template<>
+class PointerLikeTypeTraits<Instruction*> {
+ typedef Instruction* PT;
+public:
+ static inline void *getAsVoidPointer(PT P) { return P; }
+ static inline PT getFromVoidPointer(void *P) {
+ return static_cast<PT>(P);
+ }
+ enum { NumLowBitsAvailable = 2 };
+};
+
} // End llvm namespace
#endif
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