| //===-- llvm/InlineAsm.h - Class to represent inline asm strings-*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file was developed by Chris Lattner and is distributed under |
| // the University of Illinois Open Source License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This class represents the inline asm strings, which are Value*'s that are |
| // used as the callee operand of call instructions. InlineAsm's are uniqued |
| // like constants, and created via InlineAsm::get(...). |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_INLINEASM_H |
| #define LLVM_INLINEASM_H |
| |
| #include "llvm/Value.h" |
| #include "llvm/System/IncludeFile.h" |
| #include <vector> |
| |
| namespace llvm { |
| |
| struct AssemblyAnnotationWriter; |
| class PointerType; |
| class FunctionType; |
| class Module; |
| |
| class InlineAsm : public Value { |
| InlineAsm(const InlineAsm &); // do not implement |
| void operator=(const InlineAsm&); // do not implement |
| |
| std::string AsmString, Constraints; |
| bool HasSideEffects; |
| |
| InlineAsm(const FunctionType *Ty, const std::string &AsmString, |
| const std::string &Constraints, bool hasSideEffects); |
| virtual ~InlineAsm(); |
| public: |
| |
| /// InlineAsm::get - Return the the specified uniqued inline asm string. |
| /// |
| static InlineAsm *get(const FunctionType *Ty, const std::string &AsmString, |
| const std::string &Constraints, bool hasSideEffects); |
| |
| bool hasSideEffects() const { return HasSideEffects; } |
| |
| /// getType - InlineAsm's are always pointers. |
| /// |
| const PointerType *getType() const { |
| return reinterpret_cast<const PointerType*>(Value::getType()); |
| } |
| |
| /// getFunctionType - InlineAsm's are always pointers to functions. |
| /// |
| const FunctionType *getFunctionType() const; |
| |
| const std::string &getAsmString() const { return AsmString; } |
| const std::string &getConstraintString() const { return Constraints; } |
| |
| virtual void print(std::ostream &O) const { print(O, 0); } |
| void print(std::ostream &OS, AssemblyAnnotationWriter *AAW) const; |
| |
| /// Verify - This static method can be used by the parser to check to see if |
| /// the specified constraint string is legal for the type. This returns true |
| /// if legal, false if not. |
| /// |
| static bool Verify(const FunctionType *Ty, const std::string &Constraints); |
| |
| // Constraint String Parsing |
| enum ConstraintPrefix { |
| isInput, // 'x' |
| isOutput, // '=x' |
| isClobber // '~x' |
| }; |
| |
| struct ConstraintInfo { |
| /// Type - The basic type of the constraint: input/output/clobber |
| /// |
| ConstraintPrefix Type; |
| |
| /// isEarlyClobber - "&": output operand writes result before inputs are all |
| /// read. This is only ever set for an output operand. |
| bool isEarlyClobber; |
| |
| /// isIndirectOutput - If this is true for an output constraint, the address |
| /// to store the output result is passed as an operand to the call. |
| bool isIndirectOutput; |
| |
| /// hasMatchingInput - This is set to true for an output constraint iff |
| /// there is an input constraint that is required to match it (e.g. "0"). |
| bool hasMatchingInput; |
| |
| /// isCommutative - This is set to true for a constraint that is commutative |
| /// with the next operand. |
| bool isCommutative; |
| |
| /// Code - The constraint code, either the register name (in braces) or the |
| /// constraint letter/number. |
| std::vector<std::string> Codes; |
| |
| /// Parse - Analyze the specified string (e.g. "==&{eax}") and fill in the |
| /// fields in this structure. If the constraint string is not understood, |
| /// return true, otherwise return false. |
| bool Parse(const std::string &Str, |
| std::vector<InlineAsm::ConstraintInfo> &ConstraintsSoFar); |
| }; |
| |
| /// ParseConstraints - Split up the constraint string into the specific |
| /// constraints and their prefixes. If this returns an empty vector, and if |
| /// the constraint string itself isn't empty, there was an error parsing. |
| static std::vector<ConstraintInfo> |
| ParseConstraints(const std::string &ConstraintString); |
| |
| /// ParseConstraints - Parse the constraints of this inlineasm object, |
| /// returning them the same way that ParseConstraints(str) does. |
| std::vector<ConstraintInfo> |
| ParseConstraints() const { |
| return ParseConstraints(Constraints); |
| } |
| |
| // Methods for support type inquiry through isa, cast, and dyn_cast: |
| static inline bool classof(const InlineAsm *) { return true; } |
| static inline bool classof(const Value *V) { |
| return V->getValueType() == Value::InlineAsmVal; |
| } |
| }; |
| |
| } // End llvm namespace |
| |
| // Make sure the InlineAsm.cpp file is linked when this one is #included. |
| FORCE_DEFINING_FILE_TO_BE_LINKED(InlineAsm) |
| |
| #endif |