#ifndef COMPILER_USEDEFCHAINS_H
#define COMPILER_USEDEFCHAINS_H

#include "compiler/common.h"
#include "compiler/PCodeInfo.h"

#ifdef __MWERKS__
#pragma options align=mac68k
#endif
typedef struct TinyValue {
    PCOpKind kind;
    RegClass arg;
    union {
        short reg;
        Object *object;
    } u;
} TinyValue;

typedef struct UseDefInfo {
    UInt32 *defvec0;
    UInt32 *defvec4;
    UInt32 *defvec8;
    UInt32 *defvecC;
    UInt32 *usevec10;
    UInt32 *usevec14;
    UInt32 *usevec18;
    UInt32 *usevec1C;
} UseDefInfo;

typedef struct UseOrDef {
    PCode *pcode;
    TinyValue v;
} UseOrDef;

typedef struct RegUseOrDef {
    struct RegUseOrDef *next;
    int id;
} RegUseOrDef;

typedef struct ObjectUseDef {
    struct ObjectUseDef *next;
    struct ObjectUseDef *leftchild;
    struct ObjectUseDef *rightchild;
    Object *object;
    RegUseOrDef *uses;
    RegUseOrDef *defs;
} ObjectUseDef;
#ifdef __MWERKS__
#pragma options align=reset
#endif

extern int number_of_Defs;
extern UseOrDef *Defs;
extern RegUseOrDef **reg_Defs[RegClassMax];
extern int number_of_Uses;
extern UseOrDef *Uses;
extern RegUseOrDef **reg_Uses[RegClassMax];
extern UseDefInfo *usedefinfo;
extern ObjectUseDef *objectusedefs;
extern ObjectUseDef *objectusedeflist;

extern ObjectUseDef *findobjectusedef(Object *object);
extern void computeusedefchains(int flag);

#endif