Nsryjdtyk

I'm working on JIT-based programming language using DynASM (before I was generating instructions directly). Review of the code would be really appreciated - It's my first time fiddling with DynASM. Code was written to be tight and readable. You can find github repository here. Code consists mostly of one file as code is pretty small:

main.c:

#define _BSD_SOURCE

#include <sys/mman.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <stdlib.h>

#include <stdint.h>

#include <stdio.h>

#include <unistd.h>

#include <string.h>

#include <ctype.h>

#include <time.h>

#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)

    #define MAP_ANONYMOUS MAP_ANON

#endif

#include <stddef.h>

#include <stdarg.h>

#ifndef Dst_DECL

#define Dst_DECL    dasm_State **Dst

#endif

#ifndef Dst_REF

#define Dst_REF     (*Dst)

#endif

#ifndef DASM_FDEF

#define DASM_FDEF   extern

#endif

#ifndef DASM_M_GROW

#define DASM_M_GROW(ctx, t, p, sz, need) 

  do { 

    size_t _sz = (sz), _need = (need); 

    if (_sz < _need) { 

      if (_sz < 16) _sz = 16; 

      while (_sz < _need) _sz += _sz; 

      (p) = (t *)realloc((p), _sz); 

      if ((p) == NULL) exit(1); 

      (sz) = _sz; 

    } 

  } while(0)

#endif

#ifndef DASM_M_FREE

#define DASM_M_FREE(ctx, p, sz) free(p)

#endif

/* Maximum number of section buffer positions for a single dasm_put() call. */

#define DASM_MAXSECPOS      25



/* DynASM encoder status codes. Action list offset or number are or'ed in. */

#define DASM_S_OK       0x00000000

#define DASM_S_NOMEM        0x01000000

#define DASM_S_PHASE        0x02000000

#define DASM_S_MATCH_SEC    0x03000000

#define DASM_S_RANGE_I      0x11000000

#define DASM_S_RANGE_SEC    0x12000000

#define DASM_S_RANGE_LG     0x13000000

#define DASM_S_RANGE_PC     0x14000000

#define DASM_S_RANGE_VREG   0x15000000

#define DASM_S_UNDEF_L      0x21000000

#define DASM_S_UNDEF_PC     0x22000000



/* Macros to convert positions (8 bit section + 24 bit index). */

#define DASM_POS2IDX(pos)   ((pos)&0x00ffffff)

#define DASM_POS2BIAS(pos)  ((pos)&0xff000000)

#define DASM_SEC2POS(sec)   ((sec)<<24)

#define DASM_POS2SEC(pos)   ((pos)>>24)

#define DASM_POS2PTR(D, pos)    (D->sections[DASM_POS2SEC(pos)].rbuf + (pos))

typedef struct dasm_State dasm_State;

DASM_FDEF void dasm_init(Dst_DECL, int maxsection);

DASM_FDEF void dasm_free(Dst_DECL);

DASM_FDEF void dasm_setupglobal(Dst_DECL, void **gl, unsigned int maxgl);

DASM_FDEF void dasm_growpc(Dst_DECL, unsigned int maxpc);

DASM_FDEF void dasm_setup(Dst_DECL, const void *actionlist);

DASM_FDEF void dasm_put(Dst_DECL, int start, ...);

DASM_FDEF int dasm_link(Dst_DECL, size_t *szp);

DASM_FDEF int dasm_encode(Dst_DECL, void *buffer);

DASM_FDEF int dasm_getpclabel(Dst_DECL, unsigned int pc);

#ifdef DASM_CHECKS

DASM_FDEF int dasm_checkstep(Dst_DECL, int secmatch);

#else

#define dasm_checkstep(a, b)    0

#endif





#define DASM_ARCH       "x86"



#ifndef DASM_EXTERN

    #define DASM_EXTERN(a,b,c,d)    0

#endif



/* Action definitions. DASM_STOP must be 255. */

enum {

    DASM_DISP = 233,

    DASM_IMM_S, DASM_IMM_B, DASM_IMM_W, DASM_IMM_D, DASM_IMM_WB, DASM_IMM_DB,

    DASM_VREG, DASM_SPACE, DASM_SETLABEL, DASM_REL_A, DASM_REL_LG, DASM_REL_PC,

    DASM_IMM_LG, DASM_IMM_PC, DASM_LABEL_LG, DASM_LABEL_PC, DASM_ALIGN,

    DASM_EXTERN, DASM_ESC, DASM_MARK, DASM_SECTION, DASM_STOP

};



/* Action list type. */

typedef const unsigned char * dasm_ActList;



/* Per-section structure. */

typedef struct dasm_Section {

    int * rbuf;     /* Biased buffer pointer (negative section bias). */

    int * buf;      /* True buffer pointer. */

    size_t bsize;       /* Buffer size in bytes. */

    int pos;        /* Biased buffer position. */

    int epos;       /* End of biased buffer position - max single put. */

    int ofs;        /* Byte offset into section. */

} dasm_Section;



/* Core structure holding the DynASM encoding state. */

struct dasm_State {

    size_t psize;           /* Allocated size of this structure. */

    dasm_ActList actionlist;    /* Current actionlist pointer. */

    int * lglabels;     /* Local/global chain/pos ptrs. */

    size_t lgsize;

    int * pclabels;     /* PC label chains/pos ptrs. */

    size_t pcsize;

    void ** globals;        /* Array of globals (bias -10). */

    dasm_Section * section; /* Pointer to active section. */

    size_t codesize;        /* Total size of all code sections. */

    int maxsection;     /* 0 <= sectionidx < maxsection. */

    int status;         /* Status code. */

    dasm_Section sections[1];   /* All sections. Alloc-extended. */

};



/* The size of the core structure depends on the max. number of sections. */

#define DASM_PSZ(ms)    (sizeof(dasm_State)+(ms-1)*sizeof(dasm_Section))





/* Initialize DynASM state. */

void dasm_init(Dst_DECL, int maxsection) {

    dasm_State * D;

    size_t psz = 0;

    int i;

    Dst_REF = NULL;

    DASM_M_GROW(Dst, struct dasm_State, Dst_REF, psz, DASM_PSZ(maxsection));

    D = Dst_REF;

    D->psize = psz;

    D->lglabels = NULL;

    D->lgsize = 0;

    D->pclabels = NULL;

    D->pcsize = 0;

    D->globals = NULL;

    D->maxsection = maxsection;

    for (i = 0; i < maxsection; i++) {

        D->sections[i].buf = NULL;  /* Need this for pass3. */

        D->sections[i].rbuf = D->sections[i].buf - DASM_SEC2POS(i);

        D->sections[i].bsize = 0;

        D->sections[i].epos = 0;  /* Wrong, but is recalculated after resize. */

    }

}



/* Free DynASM state. */

void dasm_free(Dst_DECL) {

    dasm_State * D = Dst_REF;

    int i;

    for (i = 0; i < D->maxsection; i++)

        if (D->sections[i].buf)

            DASM_M_FREE(Dst, D->sections[i].buf, D->sections[i].bsize);

    if (D->pclabels) DASM_M_FREE(Dst, D->pclabels, D->pcsize);

    if (D->lglabels) DASM_M_FREE(Dst, D->lglabels, D->lgsize);

    DASM_M_FREE(Dst, D, D->psize);

}



/* Setup global label array. Must be called before dasm_setup(). */

void dasm_setupglobal(Dst_DECL, void ** gl, unsigned int maxgl) {

    dasm_State * D = Dst_REF;

    D->globals = gl - 10;  /* Negative bias to compensate for locals. */

    DASM_M_GROW(Dst, int, D->lglabels, D->lgsize, (10+maxgl)*sizeof(int));

}



/* Grow PC label array. Can be called after dasm_setup(), too. */

void dasm_growpc(Dst_DECL, unsigned int maxpc) {

    dasm_State * D = Dst_REF;

    size_t osz = D->pcsize;

    DASM_M_GROW(Dst, int, D->pclabels, D->pcsize, maxpc*sizeof(int));

    memset((void *)(((unsigned char *)D->pclabels)+osz), 0, D->pcsize-osz);

}



/* Setup encoder. */

void dasm_setup(Dst_DECL, const void * actionlist) {

    dasm_State * D = Dst_REF;

    int i;

    D->actionlist = (dasm_ActList)actionlist;

    D->status = DASM_S_OK;

    D->section = &D->sections[0];

    memset((void *)D->lglabels, 0, D->lgsize);

    if (D->pclabels) memset((void *)D->pclabels, 0, D->pcsize);

    for (i = 0; i < D->maxsection; i++) {

        D->sections[i].pos = DASM_SEC2POS(i);

        D->sections[i].ofs = 0;

    }

}





#ifdef DASM_CHECKS

#define CK(x, st) 

  do { if (!(x)) { 

    D->status = DASM_S_##st|(int)(p-D->actionlist-1); return; } } while (0)

#define CKPL(kind, st) 

  do { if ((size_t)((char *)pl-(char *)D->kind##labels) >= D->kind##size) { 

    D->status=DASM_S_RANGE_##st|(int)(p-D->actionlist-1); return; } } while (0)

#else

#define CK(x, st)   ((void)0)

#define CKPL(kind, st)  ((void)0)

#endif



/* Pass 1: Store actions and args, link branches/labels, estimate offsets. */

void dasm_put(Dst_DECL, int start, ...) {

    va_list ap;

    dasm_State * D = Dst_REF;

    dasm_ActList p = D->actionlist + start;

    dasm_Section * sec = D->section;

    int pos = sec->pos, ofs = sec->ofs, mrm = 4;

    int * b;

    if (pos >= sec->epos) {

        DASM_M_GROW(Dst, int, sec->buf, sec->bsize,

                    sec->bsize + 2*DASM_MAXSECPOS*sizeof(int));

        sec->rbuf = sec->buf - DASM_POS2BIAS(pos);

        sec->epos = (int)sec->bsize/sizeof(int) - DASM_MAXSECPOS+DASM_POS2BIAS(pos);

    }

    b = sec->rbuf;

    b[pos++] = start;

    va_start(ap, start);

    while (1) {

        int action = *p++;

        if (action < DASM_DISP)

            ofs++;



        else if (action <= DASM_REL_A) {

            int n = va_arg(ap, int);

            b[pos++] = n;

            switch (action) {

                case DASM_DISP:

                    if (n == 0) { if ((mrm&7) == 4) mrm = p[-2]; if ((mrm&7) != 5) break; }

                case DASM_IMM_DB: if (((n+128)&-256) == 0) goto ob;

                case DASM_REL_A: /* Assumes ptrdiff_t is int. !x64 */

                case DASM_IMM_D: ofs += 4; break;

                case DASM_IMM_S: CK(((n+128)&-256) == 0, RANGE_I); goto ob;

            case DASM_IMM_B: CK((n&-256) == 0, RANGE_I); ob: ofs++; break;

                case DASM_VREG: CK((n&-8) == 0 && (n != 4 || (*p&1) == 0), RANGE_VREG);

            }

            mrm = 4;

        } else {

            int * pl, n;

            switch (action) {

                case DASM_REL_LG:

                case DASM_IMM_LG:

                    n = *p++; pl = D->lglabels + n;

                    /* Bkwd rel or global. */

                    if (n <= 246) { CK(n>=10||*pl<0, RANGE_LG); CKPL(lg, LG); goto putrel; }

                    pl -= 246; n = *pl;

                    if (n < 0) n = 0;  /* Start new chain for fwd rel if label exists. */

                    goto linkrel;

                case DASM_REL_PC:

                case DASM_IMM_PC: pl = D->pclabels + va_arg(ap, int); CKPL(pc, PC);

                putrel:

                    n = *pl;

                    if (n < 0)    /* Label exists. Get label pos and store it. */

                        b[pos] = -n;



                    else {

                    linkrel:

                        b[pos] = n;  /* Else link to rel chain, anchored at label. */

                        *pl = pos;

                    }

                    pos++;

                    ofs += 4;  /* Maximum offset needed. */

                    if (action == DASM_REL_LG || action == DASM_REL_PC)

                        b[pos++] = ofs;  /* Store pass1 offset estimate. */

                    break;

                case DASM_LABEL_LG: pl = D->lglabels + *p++; CKPL(lg, LG); goto putlabel;

                case DASM_LABEL_PC: pl = D->pclabels + va_arg(ap, int); CKPL(pc, PC);

                putlabel:

                    n = *pl;  /* n > 0: Collapse rel chain and replace with label pos. */

                    while (n > 0) { int * pb = DASM_POS2PTR(D, n); n = *pb; *pb = pos; }

                    *pl = -pos;  /* Label exists now. */

                    b[pos++] = ofs;  /* Store pass1 offset estimate. */

                    break;

                case DASM_ALIGN:

                case DASM_ESC: p++; ofs++; break;

                case DASM_MARK: mrm = p[-2]; break;

                case DASM_SECTION:

                case DASM_STOP: goto stop;

            }

        }

    }

stop:

    va_end(ap);

    sec->pos = pos;

    sec->ofs = ofs;

}

#undef CK



/* Pass 2: Link sections, shrink branches/aligns, fix label offsets. */

int dasm_link(Dst_DECL, size_t * szp) {

    dasm_State * D = Dst_REF;

    int secnum;

    int ofs = 0;

    #ifdef DASM_CHECKS

    *szp = 0;

    if (D->status != DASM_S_OK) return D->status;

    {

        int pc;

        for (pc = 0; pc*sizeof(int) < D->pcsize; pc++)

            if (D->pclabels[pc] > 0) return DASM_S_UNDEF_PC|pc;

    }

    #endif

    {

        /* Handle globals not defined in this translation unit. */

        int idx;

        for (idx = 10; idx*sizeof(int) < D->lgsize; idx++) {

            int n = D->lglabels[idx];

            /* Undefined label: Collapse rel chain and replace with marker (< 0). */

            while (n > 0) { int * pb = DASM_POS2PTR(D, n); n = *pb; *pb = -idx; }

        }

    }

    /* Combine all code sections. No support for data sections (yet). */

    for (secnum = 0; secnum < D->maxsection; secnum++) {

        dasm_Section * sec = D->sections + secnum;

        int * b = sec->rbuf;

        int pos = DASM_SEC2POS(secnum);

        int lastpos = sec->pos;

        while (pos != lastpos) {

            dasm_ActList p = D->actionlist + b[pos++];

            while (1) {

                int op, action = *p++;

                switch (action) {

                    case DASM_REL_LG: p++; op = p[-3]; goto rel_pc;

                case DASM_REL_PC: op = p[-2]; rel_pc: {

                            int shrink = op == 0xe9 ? 3 : ((op&0xf0) == 0x80 ? 4 : 0);

                            if (shrink) {  /* Shrinkable branch opcode? */

                                int lofs, lpos = b[pos];

                                if (lpos < 0) goto noshrink;  /* Ext global? */

                                lofs = *DASM_POS2PTR(D, lpos);

                                if (lpos > pos) {  /* Fwd label: add cumulative section offsets. */

                                    int i;

                                    for (i = secnum; i < DASM_POS2SEC(lpos); i++)

                                        lofs += D->sections[i].ofs;

                                } else {

                                    lofs -= ofs;  /* Bkwd label: unfix offset. */

                                }

                                lofs -= b[pos+1];  /* Short branch ok? */

                                if (lofs >= -128-shrink && lofs <= 127) ofs -= shrink;  /* Yes. */

                            else  noshrink: shrink = 0;    /* No, cannot shrink op. */

                            }

                            b[pos+1] = shrink;

                            pos += 2;

                            break;

                        }

                    case DASM_SPACE: case DASM_IMM_LG: case DASM_VREG: p++;

                    case DASM_DISP: case DASM_IMM_S: case DASM_IMM_B: case DASM_IMM_W:

                    case DASM_IMM_D: case DASM_IMM_WB: case DASM_IMM_DB:

                    case DASM_SETLABEL: case DASM_REL_A: case DASM_IMM_PC: pos++; break;

                    case DASM_LABEL_LG: p++;

                    case DASM_LABEL_PC: b[pos++] += ofs; break; /* Fix label offset. */

                    case DASM_ALIGN: ofs -= (b[pos++]+ofs)&*p++; break; /* Adjust ofs. */

                    case DASM_EXTERN: p += 2; break;

                    case DASM_ESC: p++; break;

                    case DASM_MARK: break;

                    case DASM_SECTION: case DASM_STOP: goto stop;

                }

            }

        stop: (void)0;

        }

        ofs += sec->ofs;  /* Next section starts right after current section. */

    }

    D->codesize = ofs;  /* Total size of all code sections */

    *szp = ofs;

    return DASM_S_OK;

}



#define dasmb(x)    *cp++ = (unsigned char)(x)

#ifndef DASM_ALIGNED_WRITES

#define dasmw(x) 

  do { *((unsigned short *)cp) = (unsigned short)(x); cp+=2; } while (0)

#define dasmd(x) 

  do { *((unsigned int *)cp) = (unsigned int)(x); cp+=4; } while (0)

#else

#define dasmw(x)    do { dasmb(x); dasmb((x)>>8); } while (0)

#define dasmd(x)    do { dasmw(x); dasmw((x)>>16); } while (0)

#endif



/* Pass 3: Encode sections. */

int dasm_encode(Dst_DECL, void * buffer) {

    dasm_State * D = Dst_REF;

    unsigned char * base = (unsigned char *)buffer;

    unsigned char * cp = base;

    int secnum;

    /* Encode all code sections. No support for data sections (yet). */

    for (secnum = 0; secnum < D->maxsection; secnum++) {

        dasm_Section * sec = D->sections + secnum;

        int * b = sec->buf;

        int * endb = sec->rbuf + sec->pos;

        while (b != endb) {

            dasm_ActList p = D->actionlist + *b++;

            unsigned char * mark = NULL;

            while (1) {

                int action = *p++;

                int n = (action >= DASM_DISP && action <= DASM_ALIGN) ? *b++ : 0;

                switch (action) {

                    case DASM_DISP: if (!mark) mark = cp; {

                            unsigned char * mm = mark;

                            if (*p != DASM_IMM_DB && *p != DASM_IMM_WB) mark = NULL;

                            if (n == 0) {

                                int mrm = mm[-1]&7;

                                if (mrm == 4) mrm = mm[0]&7;

                                if (mrm != 5) { mm[-1] -= 0x80; break; }

                            }

                            if (((n+128) & -256) != 0) goto wd;

                            else mm[-1] -= 0x40;

                        }

                case DASM_IMM_S: case DASM_IMM_B: wb: dasmb(n); break;

                    case DASM_IMM_DB: if (((n+128)&-256) == 0) {

                        db:

                            if (!mark) mark = cp; mark[-2] += 2; mark = NULL; goto wb;

                        } else mark = NULL;

                case DASM_IMM_D: wd: dasmd(n); break;

                    case DASM_IMM_WB: if (((n+128)&-256) == 0) goto db;

                        else mark = NULL;

                    case DASM_IMM_W: dasmw(n); break;

                    case DASM_VREG: { int t = *p++; if (t >= 2) n<<=3; cp[-1] |= n; break; }

                    case DASM_REL_LG: p++;

                        if (n >= 0) goto rel_pc;

                        b++; n = (int)(ptrdiff_t)D->globals[-n];

                case DASM_REL_A: rel_a: n -= (int)(ptrdiff_t)(cp+4); goto wd; /* !x64 */

                case DASM_REL_PC: rel_pc: {

                            int shrink = *b++;

                            int * pb = DASM_POS2PTR(D, n);

                            if (*pb < 0) { n = pb[1]; goto rel_a; }

                            n = *pb - ((int)(cp-base) + 4-shrink);

                            if (shrink == 0) goto wd;

                            if (shrink == 4) { cp--; cp[-1] = *cp-0x10; } else cp[-1] = 0xeb;

                            goto wb;

                        }

                    case DASM_IMM_LG:

                        p++;

                        if (n < 0) { n = (int)(ptrdiff_t)D->globals[-n]; goto wd; }

                    case DASM_IMM_PC: {

                            int * pb = DASM_POS2PTR(D, n);

                            n = *pb < 0 ? pb[1] : (*pb + (int)(ptrdiff_t)base);

                            goto wd;

                        }

                    case DASM_LABEL_LG: {

                            int idx = *p++;

                            if (idx >= 10)

                                D->globals[idx] = (void *)(base + (*p == DASM_SETLABEL ? *b : n));

                            break;

                        }

                    case DASM_LABEL_PC: case DASM_SETLABEL: break;

                    case DASM_SPACE: { int fill = *p++; while (n--) *cp++ = fill; break; }

                    case DASM_ALIGN:

                        n = *p++;

                        while (((cp-base) & n)) *cp++ = 0x90; /* nop */

                        break;

                    case DASM_EXTERN: n = DASM_EXTERN(Dst, cp, p[1], *p); p += 2; goto wd;

                    case DASM_MARK: mark = cp; break;

                    case DASM_ESC: action = *p++;

                    default: *cp++ = action; break;

                    case DASM_SECTION: case DASM_STOP: goto stop;

                }

            }

        stop: (void)0;

        }

    }

    if (base + D->codesize != cp)  /* Check for phase errors. */

        return DASM_S_PHASE;

    return DASM_S_OK;

}



int dasm_getpclabel(Dst_DECL, unsigned int pc) {

    dasm_State * D = Dst_REF;

    if (pc*sizeof(int) < D->pcsize) {

        int pos = D->pclabels[pc];

        if (pos < 0) return *DASM_POS2PTR(D, -pos);

        if (pos > 0) return -1;  /* Undefined. */

    }

    return -2;  /* Unused or out of range. */

}



#ifdef DASM_CHECKS

/* Optional sanity checker to call between isolated encoding steps. */

int dasm_checkstep(Dst_DECL, int secmatch) {

    dasm_State * D = Dst_REF;

    if (D->status == DASM_S_OK) {

        int i;

        for (i = 1; i <= 9; i++) {

            if (D->lglabels[i] > 0) { D->status = DASM_S_UNDEF_L|i; break; }

            D->lglabels[i] = 0;

        }

    }

    if (D->status == DASM_S_OK && secmatch >= 0 &&

        D->section != &D->sections[secmatch])

        D->status = DASM_S_MATCH_SEC|(int)(D->section-D->sections);

    return D->status;

}

#endif



extern void * jit_buf;

extern size_t jit_sz;

extern int npc;



enum { IN_GLOBAL = 0, IN_FUNC };

enum { BLOCK_LOOP = 1, BLOCK_FUNC };

enum { V_LOCAL, V_GLOBAL };

enum { T_INT, T_STRING, T_DOUBLE };



typedef struct {

    int address, args, espBgn;

    char name[0xFF];

} func_t;



typedef struct {

    char name[32];

    unsigned int id;

    int type;

    int loctype;

} var_t;



typedef struct {

    char val[128];

    int nline;

} token_t;



struct {

    token_t * tok_t;

    int size, pos;

} tok_t;



struct {

    unsigned int * addr;

    int count;

} brks_t, rets_t;



int error(char *, ...);

int lex(char *);

int32_t skip(char * s);

void asmexpr();

int isassign();

int assignment();

int expression(int, int);

int (*parser())(int *, void **);

char * getstr();

func_t * getfn(char *);

var_t * getvar(char *);

void cmpexpr();

static unsigned int w;



struct {

    uint32_t addr[0xff];

    int count;

} memory;



static void setxor() {

    w = 1234 + (getpid() ^ 0xFFBA9285);

}



void init() {

    tok_t.pos = 0;

    tok_t.size = 0xfff;

    setxor();

    tok_t.tok_t = calloc(sizeof(token_t), tok_t.size);

    brks_t.addr = calloc(sizeof(uint32_t), 1);

    rets_t.addr = calloc(sizeof(uint32_t), 1);

}



static void freeadd() {

    if (memory.count > 0) {

        for (--memory.count; memory.count >= 0; --memory.count)

            free((void *)memory.addr[memory.count]);

        memory.count = 0;

    }

}



void dispose() {

    munmap(jit_buf, jit_sz);

    free(brks_t.addr);

    free(rets_t.addr);

    free(tok_t.tok_t);

    freeadd();

}



static void put_i32(int32_t n) {

    printf("%d", n);

}



static void put_str(int32_t * n) {

    printf("%s", (char *) n);

}



static void put_ln() {

    printf("n");

}



static void add_mem(int32_t addr) {

    memory.addr[memory.count++] = addr;

}



static int xor128() {

    static uint32_t x = 123456789, y = 362436069, z = 521288629;

    uint32_t t;

    t = x ^ (x << 11);

    x = y; y = z; z = w;

    w = (w ^ (w >> 19)) ^ (t ^ (t >> 8));

    return ((int32_t) w < 0) ? -(int32_t) w : (int32_t) w;

}



static void * funcTable = {

    put_i32, /*  0 */ put_str, /*  4 */ put_ln,  /*  8 */ malloc, /* 12 */

    xor128,  /* 16 */ printf,  /* 20 */ add_mem, /* 24 */ usleep, /* 28 */

    read,    /* 32 */ fprintf, /* 36 */ write,   /* 40 */ fgets,  /* 44 */

    free,    /* 48 */ freeadd, /* 52 */ exit,    /* 56 */ abort,  /* 60 */

    close    /* 72 */

};



int32_t lex(char * code) {

    int32_t codeSize = strlen(code), line = 1, i = 0;

    int is_crlf = 0;

    for (; i < codeSize; i++) {

        if (tok_t.size <= i)

            tok_t.tok_t = realloc(tok_t.tok_t, (tok_t.size += 512 * sizeof(token_t)));

        if (isdigit(code[i])) {

            for (; isdigit(code[i]); i++)

                strncat(tok_t.tok_t[tok_t.pos].val, &(code[i]), 1);

            tok_t.tok_t[tok_t.pos].nline = line;

            i--;

            tok_t.pos++;

        } else if (isalpha(code[i])) {

            char * str = tok_t.tok_t[tok_t.pos].val;

            for (; isalpha(code[i]) || isdigit(code[i]) || code[i] == '_'; i++)

                *str++ = code[i];

            tok_t.tok_t[tok_t.pos].nline = line;

            i--;

            tok_t.pos++;

        } else if (code[i] == ' ' || code[i] == 't') {

        } else if (code[i] == '#') {

            for (i++; code[i] != 'n'; i++)    line++;

        } else if (code[i] == '"') {

            strcpy(tok_t.tok_t[tok_t.pos].val, """);

            tok_t.tok_t[tok_t.pos++].nline = line;

            for (i++; code[i] != '"' && code[i] != ''; i++)

                strncat(tok_t.tok_t[tok_t.pos].val, &(code[i]), 1);

            tok_t.tok_t[tok_t.pos].nline = line;

            if (code[i] == '')

                error("%d: expected expression '"'", tok_t.tok_t[tok_t.pos].nline);

            tok_t.pos++;

        } else if (code[i] == 'n' || (is_crlf = (code[i] == 'r' && code[i + 1] == 'n'))) {

            i += is_crlf;

            strcpy(tok_t.tok_t[tok_t.pos].val, ";");

            tok_t.tok_t[tok_t.pos].nline = line++;

            tok_t.pos++;

        } else {

            strncat(tok_t.tok_t[tok_t.pos].val, &(code[i]), 1);

            if (code[i + 1] == '=' || (code[i] == '+' && code[i + 1] == '+') || (code[i] == '-' && code[i + 1] == '-'))

                strncat(tok_t.tok_t[tok_t.pos].val, &(code[++i]), 1);

            tok_t.tok_t[tok_t.pos].nline = line;

            tok_t.pos++;

        }

    }

    tok_t.tok_t[tok_t.pos].nline = line;

    tok_t.size = tok_t.pos - 1;

    return 0;

}



static int execute(char * source) {

    int (*jit_main)(int *, void **);

    init();

    lex(source);

    jit_main = parser();

    jit_main(0, funcTable);

    dispose();

    return 0;

}



enum {

    L_START,

    L__MAX

};



static const unsigned char euboeaactions[269] = {

    252,233,245,255,133,192,15,133,244,247,252,233,245,248,1,255,249,255,252,

    233,245,249,255,249,85,137,229,129,252,236,0,0,0,128,249,255,139,133,233,

    137,133,233,255,201,195,255,249,85,137,229,129,252,236,0,0,0,128,249,139,

    181,233,255,184,237,255,80,255,252,255,150,233,255,252,255,22,255,131,196,

    4,255,184,237,137,4,36,255,137,132,253,36,233,255,248,10,252,233,245,255,

    139,141,233,90,255,137,4,145,255,137,4,17,255,139,133,233,80,255,64,255,72,

    255,88,255,139,13,237,90,255,137,4,18,255,163,237,255,161,237,80,255,137,

    193,255,139,149,233,255,139,21,237,255,139,4,138,255,15,182,4,10,255,232,

    245,129,196,239,255,139,133,233,255,161,237,255,139,4,129,255,137,195,88,

    255,252,247,252,235,255,49,210,252,247,252,251,255,49,210,252,247,252,251,

    137,208,255,1,216,255,41,216,255,137,195,88,57,216,255,15,156,208,255,15,

    159,208,255,15,149,208,255,15,148,208,255,15,158,208,255,15,157,208,255,15,

    182,192,255,33,216,255,9,216,255,49,216,255,193,224,2,137,4,36,252,255,150,

    233,80,137,4,36,252,255,150,233,88,255

};



dasm_State * d;



static dasm_State ** Dst = &d;



void * euboealabels[L__MAX];

void * jit_buf;



size_t jit_sz;

int npc;

static int main_address, mainFunc;



struct {

    var_t var[0xFF];

    int count;

    int data[0xFF];

} gvar_t;



struct {

    var_t var[0xFF][0xFF];

    int count, size[0xFF];

} lvar_t;



struct {

    char * text[0xff];

    int * addr;

    int count;

} str_t;



struct {

    func_t func[0xff];

    int count, inside, now;

} fnc_t;



void initjit() {

    dasm_init(&d, 1);

    dasm_setupglobal(&d, euboealabels, L__MAX);

    dasm_setup(&d, euboeaactions);

}



void * deinitjit() {

    dasm_link(&d, &jit_sz);

    jit_buf = mmap(0, jit_sz, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

    dasm_encode(&d, jit_buf);

    mprotect(jit_buf, jit_sz, PROT_READ | PROT_WRITE | PROT_EXEC);

    return jit_buf;

}



char * getstr() {

    str_t.text[str_t.count] = calloc(sizeof(char), strlen(tok_t.tok_t[tok_t.pos].val) + 1);

    strcpy(str_t.text[str_t.count], tok_t.tok_t[tok_t.pos++].val);

    return str_t.text[str_t.count++];

}



var_t * getvar(char * name) {

    int i = 0;

    for (; i < lvar_t.count; i++) {

        if (!strcmp(name, lvar_t.var[fnc_t.now][i].name))

            return &lvar_t.var[fnc_t.now][i];

    }

    for (i = 0; i < gvar_t.count; i++) {

        if (!strcmp(name, gvar_t.var[i].name))

            return &gvar_t.var[i];

    }

    return NULL;

}



static var_t * appvar(char * name, int type) {

    if (fnc_t.inside == IN_FUNC) {

        int32_t sz = 1 + ++lvar_t.size[fnc_t.now];

        strcpy(lvar_t.var[fnc_t.now][lvar_t.count].name, name);

        lvar_t.var[fnc_t.now][lvar_t.count].type = type;

        lvar_t.var[fnc_t.now][lvar_t.count].id = sz;

        lvar_t.var[fnc_t.now][lvar_t.count].loctype = V_LOCAL;

        return &lvar_t.var[fnc_t.now][lvar_t.count++];

    } else if (fnc_t.inside == IN_GLOBAL) {

        strcpy(gvar_t.var[gvar_t.count].name, name);

        gvar_t.var[gvar_t.count].type = type;

        gvar_t.var[gvar_t.count].loctype = V_GLOBAL;

        gvar_t.var[gvar_t.count].id = (int)&gvar_t.data[gvar_t.count];

        return &gvar_t.var[gvar_t.count++];

    }

    return NULL;

}



func_t * getfn(char * name) {

    int i = 0;

    for (; i < fnc_t.count; i++) {

        if (!strcmp(fnc_t.func[i].name, name))

            return &fnc_t.func[i];

    }

    return NULL;

}



static func_t * appfn(char * name, int address, int espBgn, int args) {

    fnc_t.func[fnc_t.count].address = address;

    fnc_t.func[fnc_t.count].espBgn = espBgn;

    fnc_t.func[fnc_t.count].args = args;

    strcpy(fnc_t.func[fnc_t.count].name, name);

    return &fnc_t.func[fnc_t.count++];

}



static int32_t mkbrk() {

    uint32_t lbl = npc++;

    dasm_growpc(&d, npc);

    dasm_put(Dst, 0, lbl);

    brks_t.addr = realloc(brks_t.addr, 4 * (brks_t.count + 1));

    brks_t.addr[brks_t.count] = lbl;

    return brks_t.count++;

}



static int32_t mkret() {

    cmpexpr();

    int lbl = npc++;

    dasm_growpc(&d, npc);

    dasm_put(Dst, 0, lbl);

    rets_t.addr = realloc(rets_t.addr, 4 * (rets_t.count + 1));

    if (rets_t.addr == NULL) error("no enough memory");

    rets_t.addr[rets_t.count] = lbl;

    return rets_t.count++;

}



int32_t skip(char * s) {

    if (!strcmp(s, tok_t.tok_t[tok_t.pos].val)) {

        tok_t.pos++;

        return 1;

    }

    return 0;

}



int32_t error(char * errs, ...) {

    va_list args;

    va_start(args, errs);

    printf("error: ");

    vprintf(errs, args);

    puts("");

    va_end(args);

    exit(0);

    return 0;

}



static int eval(int pos, int status) {

    while (tok_t.pos < tok_t.size)

        if (expression(pos, status)) return 1;

    return 0;

}



static var_t * mkvar() {

    int32_t npos = tok_t.pos;

    if (isalpha(tok_t.tok_t[tok_t.pos].val[0])) {

        tok_t.pos++;

        if (skip(":")) {

            if (skip("int")) {

                --tok_t.pos;

                return appvar(tok_t.tok_t[npos].val, T_INT);

            }

            if (skip("string")) {

                --tok_t.pos;

                return appvar(tok_t.tok_t[npos].val, T_STRING);

            }

            if (skip("double")) {

                --tok_t.pos;

                return appvar(tok_t.tok_t[npos].val, T_DOUBLE);

            }

        } else {

            --tok_t.pos;

            return appvar(tok_t.tok_t[npos].val, T_INT);

        }

    } else error("%d: can't declare variable", tok_t.tok_t[tok_t.pos].nline);

    return NULL;

}



static int chkstmt() {

    cmpexpr();

    uint32_t end = npc++;

    dasm_growpc(&d, npc);

    dasm_put(Dst, 4, end);

    return eval(end, 0);

}



static int whilestmt() {

    uint32_t loopBgn = npc++;

    dasm_growpc(&d, npc);

    dasm_put(Dst, 16, loopBgn);

    cmpexpr();

    uint32_t stepBgn[2], stepOn = 0;

    if (skip(",")) {

        stepOn = 1;

        stepBgn[0] = tok_t.pos;

        for (; tok_t.tok_t[tok_t.pos].val[0] != ';'; tok_t.pos++);

    }

    uint32_t end = npc++;

    dasm_growpc(&d, npc);

    dasm_put(Dst, 4, end);

    if (skip(":")) expression(0, BLOCK_LOOP);

    else eval(0, BLOCK_LOOP);

    if (stepOn) {

        stepBgn[1] = tok_t.pos;

        tok_t.pos = stepBgn[0];

        if (isassign()) assignment();

        tok_t.pos = stepBgn[1];

    }

    dasm_put(Dst, 18, loopBgn, end);

    for (--brks_t.count; brks_t.count >= 0; brks_t.count--)

        dasm_put(Dst, 16, brks_t.addr[brks_t.count]);

    brks_t.count = 0;

    return 0;

}



static int32_t fnstmt() {

    int32_t argsc = 0;

    int i = 0;

    char * funcName = tok_t.tok_t[tok_t.pos++].val;

    fnc_t.now++; fnc_t.inside = IN_FUNC;

    if (skip("(")) {

        do {

            mkvar();

            tok_t.pos++;

            argsc++;

        } while (skip(","));

        if (!skip(")"))

            error("%d: expecting ')'", tok_t.tok_t[tok_t.pos].nline);

    }

    int func_addr = npc++;

    dasm_growpc(&d, npc);

    int func_esp = npc++;

    dasm_growpc(&d, npc);

    appfn(funcName, func_addr, func_esp, argsc);

    dasm_put(Dst, 23, func_addr, func_esp);

    for (; i < argsc; i++)

        dasm_put(Dst, 36, ((argsc - i - 1) * sizeof(int32_t) + 8), - (i + 2)*4);

    eval(0, BLOCK_FUNC);

    for (--rets_t.count; rets_t.count >= 0; --rets_t.count)

        dasm_put(Dst, 16, rets_t.addr[rets_t.count]);

    rets_t.count = 0;

    dasm_put(Dst, 43);

    return 0;

}



int expression(int pos, int status) {

    int isputs = 0;

    if (skip("$")) {

        if (isassign()) assignment();

    } else if (skip("def"))

        fnstmt();

    else if (fnc_t.inside == IN_GLOBAL &&

             strcmp("def", tok_t.tok_t[tok_t.pos+1].val) &&

             strcmp("$", tok_t.tok_t[tok_t.pos+1].val) &&

             (tok_t.pos+1 == tok_t.size || strcmp(";", tok_t.tok_t[tok_t.pos+1].val))) {

        fnc_t.inside = IN_FUNC;

        mainFunc = ++fnc_t.now;

        int main_esp = npc++;

        dasm_growpc(&d, npc);

        appfn("main", main_address, main_esp, 0);

        dasm_put(Dst, 46, main_address, main_esp, 12);

        eval(0, 0);

        dasm_put(Dst, 43);

        fnc_t.inside = IN_GLOBAL;

    } else if (isassign())

        assignment();

    else if ((isputs = skip("puts")) || skip("output")) {

        do {

            int isstring = 0;

            if (skip(""")) {

                dasm_put(Dst, 62, getstr());

                isstring = 1;

            } else

                cmpexpr();

            dasm_put(Dst, 65);

            if (isstring)

                dasm_put(Dst, 67, 4);



            else

                dasm_put(Dst, 72);

            dasm_put(Dst, 76);

        } while (skip(","));

        if (isputs)

            dasm_put(Dst, 67, 0x8);

    } else if (skip("printf")) {

        if (skip("""))

            dasm_put(Dst, 80, getstr());

        if (skip(",")) {

            uint32_t a = 4;

            do {

                cmpexpr();

                dasm_put(Dst, 86, a);

                a += 4;

            } while (skip(","));

        }

        dasm_put(Dst, 67, 0x14);

    } else if (skip("for")) {

        assignment();

        if (!skip(","))

            error("%d: expecting ','", tok_t.tok_t[tok_t.pos].nline);

        whilestmt();

    } else if (skip("while"))

        whilestmt();

    else if (skip("return"))

        mkret();

    else if (skip("if"))

        chkstmt();

    else if (skip("else")) {

        int32_t end = npc++;

        dasm_growpc(&d, npc);

        dasm_put(Dst, 18, end, pos);

        eval(end, 0);

        return 1;

    } else if (skip("elsif")) {

        int32_t endif = npc++;

        dasm_growpc(&d, npc);

        dasm_put(Dst, 18, endif, pos);

        cmpexpr();

        uint32_t end = npc++;

        dasm_growpc(&d, npc);

        dasm_put(Dst, 4, end);

        eval(end, 0);

        dasm_put(Dst, 16, endif);

        return 1;

    } else if (skip("break"))

        mkbrk();

    else if (skip("end")) {

        if (status == 0)

            dasm_put(Dst, 16, pos);



        else if (status == BLOCK_FUNC) fnc_t.inside = IN_GLOBAL;

        return 1;

    } else if (!skip(";"))  cmpexpr();

    return 0;

}



static char * repescape(char * str) {

    char escape[14][3] = {

        "\a", "a", "\r", "r", "\f", "f",

        "\n", "n", "\t", "t", "\b", "b",

        "\q", """

    };

    int32_t i = 0;

    for (; i < 12; i += 2) {

        char * pos;

        while ((pos = strstr(str, escape[i])) != NULL) {

            *pos = escape[i + 1][0];

            memmove(pos + 1, pos + 2, strlen(pos + 2) + 1);

        }

    }

    return str;

}



int (*parser())(int *, void **) {

    int i;

    uint8_t * buf;

    initjit();

    tok_t.pos = 0;

    str_t.addr = calloc(0xFF, sizeof(int32_t));

    main_address = npc++;

    dasm_growpc(&d, npc);

    dasm_put(Dst, 92, main_address);

    eval(0, 0);

    for (i = 0; i < str_t.count; ++i)

        repescape(str_t.text[i]);

    buf = (uint8_t *)deinitjit();

    for (i = 0; i < fnc_t.count; i++)

        *(int *)(buf + dasm_getpclabel(&d, fnc_t.func[i].espBgn) - 4) = (lvar_t.size[i+1] + 6)*4;

    dasm_free(&d);

    return ((int (*)(int *, void **))euboealabels[L_START]);

}



int32_t isassign() {

    char * val = tok_t.tok_t[tok_t.pos + 1].val;

    if (!strcmp(val, "=") || !strcmp(val, "++") || !strcmp(val, "--")) return 1;

    if (!strcmp(val, "[")) {

        int32_t i = tok_t.pos + 2, t = 1;

        while (t) {

            val = tok_t.tok_t[i].val;

            if (!strcmp(val, "[")) t++;

            if (!strcmp(val, "]")) t--;

            if (!strcmp(val, ";"))

                error("%d: invalid expression", tok_t.tok_t[tok_t.pos].nline);

            i++;

        }

        if (!strcmp(tok_t.tok_t[i].val, "=")) return 1;

    } else if (!strcmp(val, ":") && !strcmp(tok_t.tok_t[tok_t.pos + 3].val, "="))

        return 1;

    return 0;

}



int32_t assignment() {

    var_t * v = getvar(tok_t.tok_t[tok_t.pos].val);

    int32_t inc = 0, dec = 0, declare = 0;

    if (v == NULL) {

        declare++;

        v = mkvar();

    }

    tok_t.pos++;

    int siz = (v->type == T_INT ? sizeof(int32_t) : v->type == T_STRING ? sizeof(int32_t *) : v->type == T_DOUBLE ? sizeof(double) : 4);

    if (v->loctype == V_LOCAL) {

        if (skip("[")) {

            cmpexpr();

            dasm_put(Dst, 65);

            if (skip("]") && skip("=")) {

                cmpexpr();

                dasm_put(Dst, 98, - siz*v->id);

                if (v->type == T_INT)

                    dasm_put(Dst, 103);



                else

                    dasm_put(Dst, 107);

            } else if ((inc = skip("++")) || (dec = skip("--"))) {

            } else

                error("%d: invalid assignment", tok_t.tok_t[tok_t.pos].nline);

        } else {

            if (skip("="))

                cmpexpr();

            else if ((inc = skip("++")) || (dec = skip("--"))) {

                dasm_put(Dst, 111, - siz*v->id);

                if (inc)

                    dasm_put(Dst, 116);

                else if (dec)

                    dasm_put(Dst, 118);

            }

            dasm_put(Dst, 39, - siz*v->id);

            if (inc || dec)

                dasm_put(Dst, 120);

        }

    } else if (v->loctype == V_GLOBAL) {

        if (declare) {

            if (skip("=")) {

                unsigned * m = (unsigned *) v->id;

                *m = atoi(tok_t.tok_t[tok_t.pos++].val);

            }

        } else {

            if (skip("[")) {

                cmpexpr();

                dasm_put(Dst, 65);

                if (skip("]") && skip("=")) {

                    cmpexpr();

                    dasm_put(Dst, 122, v->id);

                    if (v->type == T_INT)

                        dasm_put(Dst, 103);



                    else

                        dasm_put(Dst, 127);

                } else error("%d: invalid assignment",

                                 tok_t.tok_t[tok_t.pos].nline);

            } else if (skip("=")) {

                cmpexpr();

                dasm_put(Dst, 131, v->id);

            } else if ((inc = skip("++")) || (dec = skip("--"))) {

                dasm_put(Dst, 134, v->id);

                if (inc)

                    dasm_put(Dst, 116);

                else if (dec)

                    dasm_put(Dst, 118);

                dasm_put(Dst, 131, v->id);

            }

            if (inc || dec)

                dasm_put(Dst, 120);

        }

    }

    return 0;

}

extern int buildstd(char *);



static int32_t isidx() {

    return !strcmp(tok_t.tok_t[tok_t.pos].val, "[");

}



static void priexp() {

    if (isdigit(tok_t.tok_t[tok_t.pos].val[0]))

        dasm_put(Dst, 62, atoi(tok_t.tok_t[tok_t.pos++].val));



    else if (skip("'")) {

        dasm_put(Dst, 62, tok_t.tok_t[tok_t.pos++].val[0]);

        skip("'");

    } else if (skip("""))

        dasm_put(Dst, 62, getstr());



    else if (isalpha(tok_t.tok_t[tok_t.pos].val[0])) {

        char * name = tok_t.tok_t[tok_t.pos].val;

        var_t * v;

        if (isassign()) assignment();

        else {

            tok_t.pos++;

            if (skip("[")) {

                if ((v = getvar(name)) == NULL)

                    error("%d: '%s' was not declared",

                          tok_t.tok_t[tok_t.pos].nline, name);

                cmpexpr();

                dasm_put(Dst, 138);

                if (v->loctype == V_LOCAL)

                    dasm_put(Dst, 141, - v->id*4);



                else if (v->loctype == V_GLOBAL)

                    dasm_put(Dst, 145, v->id);

                if (v->type == T_INT)

                    dasm_put(Dst, 149);



                else

                    dasm_put(Dst, 153);

                if (!skip("]"))

                    error("%d: expected expression ']'",

                          tok_t.tok_t[tok_t.pos].nline);

            } else if (skip("(")) {

                if (!buildstd(name)) {

                    func_t * function = getfn(name);

                    char * val = tok_t.tok_t[tok_t.pos].val;

                    int i = 0;

                    if (isalpha(val[0]) || isdigit(val[0]) ||

                        !strcmp(val, """) || !strcmp(val, "(")) {

                        for (; i < function->args; i++) {

                            cmpexpr();

                            dasm_put(Dst, 65);

                            skip(",");

                        }

                    }

                    dasm_put(Dst, 158, function->address, function->args * sizeof(int32_t));

                }

                if (!skip(")"))

                    error("func: %d: expected expression ')'",

                          tok_t.tok_t[tok_t.pos].nline);

            } else {

                if ((v = getvar(name)) == NULL)

                    error("var: %d: '%s' was not declared",

                          tok_t.tok_t[tok_t.pos].nline, name);

                if (v->loctype == V_LOCAL)

                    dasm_put(Dst, 164, - v->id*4);



                else if (v->loctype == V_GLOBAL)

                    dasm_put(Dst, 168, v->id);

            }

        }

    } else if (skip("(")) {

        if (isassign()) assignment();

        else cmpexpr();

        if (!skip(")")) error("%d: expected expression ')'", tok_t.tok_t[tok_t.pos].nline);

    }

    while (isidx()) {

        dasm_put(Dst, 138);

        skip("[");

        cmpexpr();

        skip("]");

        dasm_put(Dst, 171);

    }

}



static void muldivexp() {

    int32_t mul = 0, div = 0;

    priexp();

    while ((mul = skip("*")) || (div = skip("/")) || skip("%")) {

        dasm_put(Dst, 65);

        priexp();

        dasm_put(Dst, 175);

        if (mul)

            dasm_put(Dst, 179);



        else if (div)

            dasm_put(Dst, 184);



        else

            dasm_put(Dst, 191);

    }

}



static void addSubExpr() {

    int32_t add;

    muldivexp();

    while ((add = skip("+")) || skip("-")) {

        dasm_put(Dst, 65);

        muldivexp();

        dasm_put(Dst, 175);

        if (add)

            dasm_put(Dst, 200);



        else

            dasm_put(Dst, 203);

    }

}



static void logicexp() {

    int32_t lt = 0, gt = 0, ne = 0, eql = 0, fle = 0;

    addSubExpr();

    if ((lt = skip("<")) || (gt = skip(">")) || (ne = skip("!=")) ||

        (eql = skip("==")) || (fle = skip("<=")) || skip(">=")) {

        dasm_put(Dst, 65);

        addSubExpr();

        dasm_put(Dst, 206);

        if (lt)

            dasm_put(Dst, 212);

        else if (gt)

            dasm_put(Dst, 216);

        else if (ne)

            dasm_put(Dst, 220);

        else if (eql)

            dasm_put(Dst, 224);

        else if (fle)

            dasm_put(Dst, 228);

        else

            dasm_put(Dst, 232);

        dasm_put(Dst, 236);

    }

}



void cmpexpr() {

    int and = 0, or = 0;

    logicexp();

    while ((and = skip("and") || skip("&")) ||

           (or = skip("or") || skip("|")) || (skip("xor") || skip("^"))) {

        dasm_put(Dst, 65);

        logicexp();

        dasm_put(Dst, 175);

        if (and)

            dasm_put(Dst, 240);

        else if (or)

            dasm_put(Dst, 243);

        else

            dasm_put(Dst, 246);

    }

}



typedef struct {

    char * name;

    int args, addr;

} stdfn;



static stdfn stdfuncts = {

    {"Array", 1, 12},

    {"rand", 0, 16}, {"printf", -1, 20}, {"usleep", 1, 28},

    {"fprintf", -1, 36}, {"fgets", 3, 44},

    {"free", 1, 48}, {"freeLocal", 0, 52}, {"malloc", 1, 12}, {"exit", 1, 56},

    {"abort", 0, 60}, {"read", 3, 32}, {"write", 3, 40}, {"close", 1, 64}

};



int buildstd(char * name) {

    size_t i = 0;

    for (; i < sizeof(stdfuncts) / sizeof(stdfuncts[0]); i++) {

        if (!strcmp(stdfuncts[i].name, name)) {

            if (!strcmp(name, "Array")) {

                cmpexpr();

                dasm_put(Dst, 249, 12, 24);

            } else {

                if (stdfuncts[i].args == -1) {

                    uint32_t a = 0;

                    do {

                        cmpexpr();

                        dasm_put(Dst, 86, a);

                        a += 4;

                    } while (skip(","));

                } else {

                    int arg = 0;

                    for (; arg < stdfuncts[i].args; arg++) {

                        cmpexpr();

                        dasm_put(Dst, 86, arg*4);

                        skip(",");

                    }

                }

                dasm_put(Dst, 67, stdfuncts[i].addr);

            }

            return 1;

        }

    }

    return 0;

}



int main(int argc, char ** argv) {

    char * src;

    FILE * fp;

    size_t ssz;

    if (argc < 2) error("no given filename");

    fp = fopen(argv[1], "rb");

    ssz = 0;

    if (!fp) {

        perror("fopen");

        exit(0);

    }

    struct stat sbuf;

    stat(argv[1], &sbuf);

    if (S_ISDIR(sbuf.st_mode)) {

        fclose(fp);

        printf("Error: %s is a directory.n", argv[1]);

        exit(0);

    }

    fseek(fp, 0, SEEK_END);

    ssz = ftell(fp);

    fseek(fp, 0, SEEK_SET);

    src = calloc(sizeof(char), ssz + 2);

    fread(src, sizeof(char), ssz, fp);

    fclose(fp);

    return execute(src);

}

Currently I'm working on splitting the code logically into source files because it could be a bit more readable anyway. Any tips would be appreciated.