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#include <assert.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef unsigned int uint;
typedef struct Bits Bits;
typedef struct Ref Ref;
typedef struct OpDesc OpDesc;
typedef struct Ins Ins;
typedef struct Phi Phi;
typedef struct Blk Blk;
typedef struct Sym Sym;
typedef struct Cons Cons;
typedef struct Fn Fn;
typedef enum { U, F, T } B3;
enum {
RAX = 1, /* caller-save */
RCX,
RDX,
RSI,
RDI,
R8,
R9,
R10,
R11,
RBX, /* callee-save */
R12,
R13,
R14,
R15,
RBP, /* reserved */
RSP,
// NReg = R15 - RAX + 1
NReg = 3 /* for test purposes */
};
enum {
Tmp0 = 33,
NString = 32,
NPred = 15,
NBlk = 128,
NIns = 256,
BITS = 4,
NBit = 64,
};
struct Bits {
uint64_t t[BITS];
};
#define BGET(b, n) (1&((b).t[n/NBit]>>(n%NBit)))
#define BSET(b, n) ((b).t[n/NBit] |= 1ll<<(n%NBit))
#define BCLR(b, n) ((b).t[n/NBit] &= ~(1ll<<(n%NBit)))
struct Ref {
uint16_t type:2;
uint16_t val:14;
};
enum {
RSym,
RCons,
RSlot,
NRef = (1<<14) - 1
};
#define R (Ref){0, 0}
#define SYM(x) (Ref){RSym, x}
#define CONS(x) (Ref){RCons, x}
#define SLOT(x) (Ref){RSlot, x}
static inline int req(Ref a, Ref b)
{ return a.type == b.type && a.val == b.val; }
static inline int rtype(Ref r)
{ return req(r, R) ? -1 : r.type; }
enum {
OXXX = 0,
/* public instruction */
OAdd,
OSub,
ODiv,
ORem,
OStore,
OLoad,
/* reserved instructions */
ONop,
OCopy,
OSwap,
OSign,
OXDiv,
OLast
};
enum {
CXXX,
CWord,
CLong,
};
enum {
JXXX,
JRet,
JJmp,
JJez,
};
struct OpDesc {
char *name;
int arity;
B3 comm;
};
struct Ins {
short op;
Ref to;
Ref arg[2];
};
struct Phi {
Ref to;
Ref arg[NPred];
Blk *blk[NPred];
uint narg;
Phi *link;
};
struct Blk {
Phi *phi;
Ins *ins;
uint nins;
struct {
short type;
Ref arg;
} jmp;
Blk *s1;
Blk *s2;
Blk *link;
int id;
int visit;
Blk **pred;
uint npred;
Bits in, out, gen;
int nlive;
int loop;
char name[NString];
};
struct Sym {
enum {
SUndef,
SReg,
STmp,
} type;
char name[NString];
int class;
uint ndef, nuse;
uint cost;
uint spill;
int hint;
};
struct Cons {
enum {
CUndef,
CNum,
CAddr,
} type;
char label[NString];
int64_t val;
};
struct Fn {
Blk *start;
Sym *sym;
Cons *cons;
int ntmp;
int nblk;
Blk **rpo;
uint nspill;
};
/* main.c */
extern char debug['Z'+1];
void dumpss(Bits *, Sym *, FILE *);
/* parse.c */
extern OpDesc opdesc[];
void diag(char *);
void *alloc(size_t);
Blk *blocka(void);
Fn *parsefn(FILE *);
void printfn(Fn *, FILE *);
/* ssa.c */
void fillpreds(Fn *);
void fillrpo(Fn *);
void ssafix(Fn *, int);
/* live.c */
void filllive(Fn *);
/* isel.c */
void isel(Fn *);
/* spill.c */
int bcnt(Bits *);
void fillcost(Fn *);
void spill(Fn *);
/* rega.c */
void rega(Fn *);
/* emit.c */
void emitfn(Fn *, FILE *);
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