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+//===-- llvm/InlineAsm.h - Class to represent inline asm strings-*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file 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 <vector>
+
+namespace llvm {
+
+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; }
+
+ /// 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;
+
+ /// MatchingInput - If this is not -1, this is an output constraint where an
+ /// input constraint is required to match it (e.g. "0"). The value is the
+ /// constraint number that matches this one (for example, if this is
+ /// constraint #0 and constraint #4 has the value "0", this will be 4).
+ signed char MatchingInput;
+
+ /// hasMatchingInput - Return true if this is an output constraint that has
+ /// a matching input constraint.
+ bool hasMatchingInput() const { return MatchingInput != -1; }
+
+ /// isCommutative - This is set to true for a constraint that is commutative
+ /// with the next operand.
+ bool isCommutative;
+
+ /// isIndirect - True if this operand is an indirect operand. This means
+ /// that the address of the source or destination is present in the call
+ /// instruction, instead of it being returned or passed in explicitly. This
+ /// is represented with a '*' in the asm string.
+ bool isIndirect;
+
+ /// 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->getValueID() == Value::InlineAsmVal;
+ }
+
+ /// getNumOperandRegisters - Extract the number of registers field from the
+ /// inline asm operand flag.
+ static unsigned getNumOperandRegisters(unsigned Flag) {
+ return (Flag & 0xffff) >> 3;
+ }
+
+ /// isUseOperandTiedToDef - Return true if the flag of the inline asm
+ /// operand indicates it is an use operand that's matched to a def operand.
+ static bool isUseOperandTiedToDef(unsigned Flag, unsigned &Idx) {
+ if ((Flag & 0x80000000) == 0)
+ return false;
+ Idx = (Flag & ~0x80000000) >> 16;
+ return true;
+ }
+
+
+};
+
+} // End llvm namespace
+
+#endif
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