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#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
typedef unsigned int uint;
typedef unsigned short ushort;
typedef unsigned char uchar;
enum {
NReg = 32,
Tmp0 = NReg+1,
NString = 32,
NPred = 15,
NBlk = 128,
NIns = 256,
};
typedef struct OpDesc OpDesc;
typedef struct Ins Ins;
typedef struct Phi Phi;
typedef struct Blk Blk;
typedef struct Sym Sym;
typedef struct Fn Fn;
typedef struct Ref Ref;
struct Ref {
ushort type:1;
ushort val:15;
};
static inline int
req(Ref a, Ref b)
{
return a.type == b.type && a.val == b.val;
}
#define R (Ref){0, 0} // Invalid reference
enum {
RSym = 0,
RConst = 1,
NRef = (1<<15) - 1
};
#define SYM(x) (Ref){RSym, x}
#define CONST(x) (Ref){RConst, x}
enum {
OXXX,
OAdd,
OSub,
ODiv,
OMod,
OCopy,
/* reserved instructions */
OX86Div,
OLast
};
struct OpDesc {
int arity;
int commut:1;
char *name;
};
enum {
JXXX,
JRet,
JJmp,
JJez,
};
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;
Blk **pred;
uint npred;
char name[NString];
int id;
};
struct Sym {
enum {
SUndef,
SReg,
STmp,
} type;
char name[NString];
int ndef, nuse;
};
struct Fn {
Blk *start;
Sym *sym;
int ntmp;
int nblk;
Blk **rpo;
};
/* parse.c */
extern OpDesc opdesc[];
void *alloc(size_t);
Fn *parsefn(FILE *);
void printfn(Fn *, FILE *);
/* ssa.c */
void fillpreds(Fn *);
void fillrpo(Fn *);
void ssafix(Fn *, int);
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