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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36522 91177308-0d34-0410-b5e6-96231b3b80d8
139 lines
4.9 KiB
C++
139 lines
4.9 KiB
C++
//===-- llvm/InlineAsm.h - Class to represent inline asm strings-*- 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 Chris Lattner 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 class represents the inline asm strings, which are Value*'s that are
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// used as the callee operand of call instructions. InlineAsm's are uniqued
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// like constants, and created via InlineAsm::get(...).
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_INLINEASM_H
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#define LLVM_INLINEASM_H
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#include "llvm/Value.h"
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#include "llvm/System/IncludeFile.h"
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#include <vector>
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namespace llvm {
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struct AssemblyAnnotationWriter;
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class PointerType;
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class FunctionType;
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class Module;
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class InlineAsm : public Value {
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InlineAsm(const InlineAsm &); // do not implement
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void operator=(const InlineAsm&); // do not implement
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std::string AsmString, Constraints;
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bool HasSideEffects;
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InlineAsm(const FunctionType *Ty, const std::string &AsmString,
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const std::string &Constraints, bool hasSideEffects);
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virtual ~InlineAsm();
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public:
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/// InlineAsm::get - Return the the specified uniqued inline asm string.
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///
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static InlineAsm *get(const FunctionType *Ty, const std::string &AsmString,
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const std::string &Constraints, bool hasSideEffects);
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bool hasSideEffects() const { return HasSideEffects; }
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/// getType - InlineAsm's are always pointers.
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///
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const PointerType *getType() const {
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return reinterpret_cast<const PointerType*>(Value::getType());
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}
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/// getFunctionType - InlineAsm's are always pointers to functions.
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///
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const FunctionType *getFunctionType() const;
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const std::string &getAsmString() const { return AsmString; }
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const std::string &getConstraintString() const { return Constraints; }
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virtual void print(std::ostream &O) const { print(O, 0); }
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void print(std::ostream *O) const { if (O) print(*O); }
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void print(std::ostream &OS, AssemblyAnnotationWriter *AAW) const;
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/// Verify - This static method can be used by the parser to check to see if
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/// the specified constraint string is legal for the type. This returns true
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/// if legal, false if not.
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///
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static bool Verify(const FunctionType *Ty, const std::string &Constraints);
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// Constraint String Parsing
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enum ConstraintPrefix {
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isInput, // 'x'
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isOutput, // '=x'
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isClobber // '~x'
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};
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struct ConstraintInfo {
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/// Type - The basic type of the constraint: input/output/clobber
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///
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ConstraintPrefix Type;
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/// isEarlyClobber - "&": output operand writes result before inputs are all
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/// read. This is only ever set for an output operand.
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bool isEarlyClobber;
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/// hasMatchingInput - This is set to true for an output constraint iff
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/// there is an input constraint that is required to match it (e.g. "0").
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bool hasMatchingInput;
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/// isCommutative - This is set to true for a constraint that is commutative
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/// with the next operand.
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bool isCommutative;
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/// isIndirect - True if this operand is an indirect operand. This means
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/// that the address of the source or destination is present in the call
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/// instruction, instead of it being returned or passed in explicitly. This
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/// is represented with a '*' in the asm string.
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bool isIndirect;
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/// Code - The constraint code, either the register name (in braces) or the
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/// constraint letter/number.
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std::vector<std::string> Codes;
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/// Parse - Analyze the specified string (e.g. "=*&{eax}") and fill in the
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/// fields in this structure. If the constraint string is not understood,
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/// return true, otherwise return false.
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bool Parse(const std::string &Str,
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std::vector<InlineAsm::ConstraintInfo> &ConstraintsSoFar);
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};
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/// ParseConstraints - Split up the constraint string into the specific
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/// constraints and their prefixes. If this returns an empty vector, and if
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/// the constraint string itself isn't empty, there was an error parsing.
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static std::vector<ConstraintInfo>
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ParseConstraints(const std::string &ConstraintString);
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/// ParseConstraints - Parse the constraints of this inlineasm object,
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/// returning them the same way that ParseConstraints(str) does.
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std::vector<ConstraintInfo>
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ParseConstraints() const {
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return ParseConstraints(Constraints);
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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 InlineAsm *) { return true; }
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static inline bool classof(const Value *V) {
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return V->getValueID() == Value::InlineAsmVal;
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}
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};
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} // End llvm namespace
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// Make sure the InlineAsm.cpp file is linked when this one is #included.
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FORCE_DEFINING_FILE_TO_BE_LINKED(InlineAsm)
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#endif
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