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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 StringRef &AsmString,
const StringRef &Constraints, bool hasSideEffects);
virtual ~InlineAsm();
public:
/// InlineAsm::get - Return the the specified uniqued inline asm string.
///
static InlineAsm *get(const FunctionType *Ty, const StringRef &AsmString,
const StringRef &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 StringRef &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 StringRef &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 StringRef &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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