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https://github.com/c64scene-ar/llvm-6502.git
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4bc3daaa3f
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280 91177308-0d34-0410-b5e6-96231b3b80d8
103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
// $Id$ -*-c++-*-
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//***************************************************************************
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// File:
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// TargetMachine.h
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//
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// Purpose:
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//
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// History:
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// 7/12/01 - Vikram Adve - Created
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//**************************************************************************/
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#ifndef LLVM_CODEGEN_TARGETMACHINE_H
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#define LLVM_CODEGEN_TARGETMACHINE_H
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#include "llvm/Support/NonCopyable.h"
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#include "llvm/Support/DataTypes.h"
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#include <string>
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class Type;
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class StructType;
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//---------------------------------------------------------------------------
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// Data types used to define information about a single machine instruction
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//---------------------------------------------------------------------------
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typedef int MachineOpCode;
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typedef int OpCodeMask;
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// struct MachineInstrInfo:
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// Predefined information about each machine instruction.
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//
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struct MachineInstrInfo {
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string opCodeString; // Assembly language mnemonic for the opcode.
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unsigned int numOperands; // Number of arguments for the instruction.
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int resultPos; // Position of the result; -1 if no result
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unsigned int maxImmedConst; // Largest +ve constant in IMMMED field or 0.
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bool immedIsSignExtended; // Is the IMMED field sign-extended? If so,
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// smallest -ve value is -(maxImmedConst+1).
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// Check if the specified constant fits in the immediate field
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// of this machine instruction
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//
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bool constantFitsInImmedField (int64_t intValue) const;
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// Return the largest +ve constant that can be held in the IMMMED field
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// of this machine instruction.
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// isSignExtended is set to true if the value is sign-extended before use
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// (this is true for all immediate fields in SPARC instructions).
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// Return 0 if the instruction has no IMMED field.
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//
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inline uint64_t maxImmedConstant(bool& isSignExtended) const {
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isSignExtended = immedIsSignExtended;
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return maxImmedConst; }
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};
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// Global variable holding an array of the above structures.
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// This needs to be defined separately for each target machine.
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//
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extern const MachineInstrInfo* TargetMachineInstrInfo;
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//---------------------------------------------------------------------------
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// class TargetMachine
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//
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// Purpose:
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// Machine description.
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//
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//---------------------------------------------------------------------------
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class TargetMachine : public NonCopyableV {
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public:
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int optSizeForSubWordData;
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int intSize;
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int longSize;
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int floatSize;
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int doubleSize;
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int longDoubleSize;
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int pointerSize;
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int minMemOpWordSize;
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int maxAtomicMemOpWordSize;
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// Description of machine instructions (array indexed by machine opcode)
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const MachineInstrInfo* machineInstrInfo;
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// Register information. This needs to be reorganized into a single class.
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int zeroRegNum; // register that gives 0 if any (-1 if none)
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public:
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/*ctor*/ TargetMachine () {}
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/*dtor*/ virtual ~TargetMachine () {}
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virtual unsigned int findOptimalStorageSize (const Type* ty) const;
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virtual unsigned int* findOptimalMemberOffsets(const StructType* stype)const;
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};
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//**************************************************************************/
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#endif
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