#ifndef COMPILER_PCODE_H
#define COMPILER_PCODE_H

#include "compiler/common.h"

#ifdef __MWERKS__
#pragma options align=mac68k
#endif

#define PCODE_FLAG_SET_T(pcode) (((pcode)->flags & (fPCodeFlag1 | fPCodeFlag8)) ? (pcode)->flags : 0)
#define PCODE_FLAG_SET_F(pcode) (((pcode)->flags & (fPCodeFlag1 | fPCodeFlag8)) ? 0 : (pcode)->flags)

enum {
    EffectRead = 1,
    EffectWrite = 2
};

typedef enum {
    PCOp_REGISTER,
    PCOp_SYSREG,
    PCOp_IMMEDIATE,
    PCOp_MEMORY,
    PCOp_LABEL,
    PCOp_LABELDIFF,
    PCOp_PLACEHOLDEROPERAND
} PCOpKind;

typedef enum {
    RefType_0,
    RefType_1,
    RefType_2,
    RefType_3,
    RefType_4,
    RefType_5,
    RefType_6,
    RefType_7,
    RefType_8,
    RefType_9,
    RefType_A,
    RefType_B,
    RefType_C,
    RefType_D
} PCRefType;

struct PCodeArg {
    PCOpKind kind;
    char arg;
    union {
        struct {
            unsigned short effect;
            short reg;
        } reg;
        struct {
            SInt32 value;
            Object *obj;
        } imm;
        struct {
            SInt32 offset;
            Object *obj;
        } mem;
        struct {
            PCodeLabel *label;
        } label;
        struct {
            SInt16 offset;
            PCodeLabel *labelA;
            PCodeLabel *labelB;
        } labeldiff;
        unsigned char placeholder[10]; // keep the size
    } data;
};

struct PCode {
    PCode *nextPCode;
    PCode *prevPCode;
    PCodeBlock *block;
    unsigned int xx_C;
    unsigned int _10;
    int flags;
    void *_18;
    SInt32 sourceoffset;
    short op;
    short argCount;
    PCodeArg args[0];
};

struct PCodeLabel {
    PCodeLabel *nextLabel;
    PCodeBlock *block;
    short resolved;
    short index;
};

typedef struct _PCLink {
    struct _PCLink *nextLink;
    struct PCodeBlock *block;
} PCLink;

struct PCodeBlock {
    struct PCodeBlock *nextBlock;
    struct PCodeBlock *prevBlock;
    PCodeLabel *labels;
    PCLink *predecessors;
    PCLink *successors;
    PCode *firstPCode;
    PCode *lastPCode;
    int blockIndex;
    int codeOffset; // in bytes
    int loopWeight;
    short pcodeCount;
    unsigned short flags;
};

/* PCode Flags */
enum {
    fPCodeFlag1 = 1,
    fPCodeFlag2 = 2,
    fPCodeFlag4 = 4,
    fPCodeFlag8 = 8,
    fPCodeFlag10 = 0x10,
    fPCodeFlag20 = 0x20,
    // Always valid
    fIsConst = 0x40,
    fIsVolatile = 0x80,
    fSideEffects = 0x100,
    fPCodeFlag200 = 0x200, // ?
    fPCodeFlag400 = 0x400, // ?
    fPCodeFlag800 = 0x800, // ?
    fPCodeFlag1000 = 0x1000, // ?
    fCommutative = 0x2000,
    fIsCSE = 0x4000,
    fPCodeFlag8000 = 0x8000,
    fPCodeFlag20000 = 0x20000, // ?
    fPCodeFlag40000 = 0x40000, // ?
    // Set 1 only
    fLink = 0x1000000,
    fBranchNotTaken = 0x4000000,
    fBranchTaken = 0x8000000,
    fAbsolute = 0x10000000,
    // Set 2 only
    fIsPtrOp = 0x20,
    fOverflow = 0x800000,
    fSetsCarry = 0x10000000,
    // ??
    fPCodeFlag8000000 = 0x8000000,
    fPCodeFlag10000000 = 0x10000000,
    fPCodeFlag20000000 = 0x20000000,
    fPCodeFlag40000000 = 0x40000000,
    fPCodeFlag80000000 = 0x80000000
};

enum {
    fPCBlockFlag1 = 1, // prologue
    fPCBlockFlag2 = 2, // epilogue
    fPCBlockFlag4 = 4,
    fPCBlockFlag8 = 8,
    fPCBlockFlag10 = 0x10,
    fPCBlockFlag20 = 0x20,
    fPCBlockFlag4000 = 0x4000
};

extern PCodeBlock *pcbasicblocks;
extern PCodeBlock *pclastblock;
extern PCodeBlock *prologue;
extern PCodeBlock *epilogue;
extern PCodeBlock **depthfirstordering;
extern int pcblockcount;
extern int pcloopweight;

extern void initpcode();
extern PCode *makepcode(short op, ...);
extern void emitpcode(short op, ...);
extern PCode *copypcode(PCode *pcode);
extern PCodeLabel *makepclabel();
extern PCodeBlock *makepcblock();
extern void pclabel(PCodeBlock *block, PCodeLabel *label);
extern void pcbranch(PCodeBlock *block, PCodeLabel *label);
extern void pccomputepredecessors();
extern void deleteblock(PCodeBlock *block);
extern void deleteunreachableblocks();
extern void appendpcode(PCodeBlock *block, PCode *pcode);
extern void deletepcode(PCode *pcode);
extern void insertpcodebefore(PCode *anchor, PCode *newpcode);
extern void insertpcodeafter(PCode *anchor, PCode *newpcode);
extern void setpcodeflags(int flags);
extern void clearpcodeflags(int flags);
extern int pccomputeoffsets();
extern void computedepthfirstordering();

#ifdef __MWERKS__
#pragma options align=reset
#endif

#endif