Annotation of gforth/main.c, revision 1.8
1.1 anton 1: /*
1.8 ! pazsan 2: $Id: main.c,v 1.7 1994/07/08 15:00:55 anton Exp $
1.1 anton 3: Copyright 1993 by the ANSI figForth Development Group
4: */
5:
6: #include <ctype.h>
7: #include <stdio.h>
8: #include <string.h>
9: #include <math.h>
10: #include <sys/types.h>
11: #include <sys/stat.h>
12: #include <fcntl.h>
13: #include <assert.h>
14: #include <stdlib.h>
15: #include "forth.h"
1.5 pazsan 16: #include "io.h"
1.1 anton 17:
1.7 anton 18: Xt *throw_ip;
19:
20:
1.2 pazsan 21: #ifndef DEFAULTBIN
22: # define DEFAULTBIN ""
23: #endif
24:
1.1 anton 25: #ifdef DIRECT_THREADED
1.2 pazsan 26: # define CA(n) (symbols[(n)])
1.1 anton 27: #else
1.2 pazsan 28: # define CA(n) ((int)(symbols+(n)))
1.1 anton 29: #endif
30:
31: /* image file format:
32: * size of image with stacks without tags (in bytes)
33: * size of image without stacks and tags (in bytes)
1.5 pazsan 34: * size of data and FP stack (in bytes)
1.1 anton 35: * pointer to start of code
1.7 anton 36: * pointer into throw (for signal handling)
1.1 anton 37: * data (size in image[1])
38: * tags (1 bit/data cell)
39: *
40: * tag==1 mean that the corresponding word is an address;
41: * If the word is >=0, the address is within the image;
42: * addresses within the image are given relative to the start of the image.
43: * If the word is =-1, the address is NIL,
1.2 pazsan 44: * If the word is between -2 and -5, it's a CFA (:, Create, Constant, User)
45: * If the word is -6, it's a DOES> CFA
46: * If the word is -7, it's a DOES JUMP
47: * If the word is <-7, it's a primitive
1.1 anton 48: */
49:
50: void relocate(int *image, char *bitstring, int size, Label symbols[])
51: {
1.5 pazsan 52: int i=0, j, k, steps=(size/sizeof(Cell))/8;
53: char bits;
54: /* static char bits[8]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};*/
55:
56: for(k=0; k<=steps; k++)
57: for(j=0, bits=bitstring[k]; j<8; j++, i++, bits<<=1)
58: if(bits & 0x80)
59: if(image[i]<0)
60: switch(image[i])
61: {
62: case CF_NIL : image[i]=0; break;
63: case CF(DOCOL) :
64: case CF(DOVAR) :
65: case CF(DOCON) :
66: case CF(DOUSER) : MAKE_CF(image+i,symbols[CF(image[i])]); break;
67: case CF(DODOES) : MAKE_DOES_CF(image+i,image[i+1]+((int)image));
68: break;
69: case CF(DOESJUMP): MAKE_DOES_HANDLER(image+i); break;
70: default : image[i]=(Cell)CA(CF(image[i]));
71: }
72: else
73: image[i]+=(Cell)image;
1.2 pazsan 74:
1.5 pazsan 75: CACHE_FLUSH(image,size);
1.1 anton 76: }
77:
78: int* loader(const char* filename)
79: { int header[2];
80: FILE *imagefile;
81: int *image;
82:
83: if(!(int)(imagefile=fopen(filename,"rb")))
84: {
85: fprintf(stderr,"Can't open image file '%s'",filename);
86: exit(1);
87: }
88:
89: fread(header,1,2*sizeof(int),imagefile);
90:
91: image=malloc(header[0]+((header[0]-1)/sizeof(Cell))/8+1);
92:
93: memset(image,0,header[0]+((header[0]-1)/sizeof(Cell))/8+1);
94:
95: image[0]=header[0];
96: image[1]=header[1];
97:
98: fread(image+2,1,header[1]-2*sizeof(Cell),imagefile);
99: fread(((void *)image)+header[0],1,((header[1]-1)/sizeof(Cell))/8+1,
100: imagefile);
101: fclose(imagefile);
102:
1.4 anton 103: relocate(image,(char *)image+header[0],header[1],engine(0,0,0,0,0));
1.1 anton 104:
105: return(image);
106: }
107:
108: int go_forth(int *image, int stack, Cell *entries)
109: {
110: Cell* rp=(Cell*)((void *)image+image[0]);
111: double* fp=(double*)((void *)rp-image[2]);
1.4 anton 112: Address lp=(Address)((void *)fp-image[2]);
113: Cell* sp=(Cell*)((void *)lp-image[2]);
1.1 anton 114: Cell* ip=(Cell*)(image[3]);
1.8 ! pazsan 115: int throw_code;
1.7 anton 116:
117: throw_ip = (Xt *)(image[4]);
1.1 anton 118: for(;stack>0;stack--)
119: *--sp=entries[stack-1];
120:
121: install_signal_handlers(); /* right place? */
1.8 ! pazsan 122:
! 123: if ((throw_code=setjmp(throw_jmp_buf))) {
! 124: static Cell signal_data_stack[8];
! 125: static Cell signal_return_stack[8];
! 126:
! 127: signal_data_stack[7]=throw_code;
! 128:
! 129: return((int)engine(image[4],signal_data_stack+7,
! 130: signal_return_stack+8,0,0));
! 131: }
1.1 anton 132:
1.4 anton 133: return((int)engine(ip,sp,rp,fp,lp));
1.1 anton 134: }
135:
136: int main(int argc, char **argv, char **env)
137: {
138: char imagefile[256];
139: Cell environ[3] = {(Cell)argc, (Cell)argv, (Cell)env};
140: char* imagepath;
141:
1.6 anton 142: #if defined(i386) && defined(ALIGNMENT_CHECK)
143: /* turn on alignment checks on the 486.
144: * on the 386 this should have no effect. */
145: __asm__("pushfl; popl %eax; orl $0x40000, %eax; pushl %eax; popfl;");
146: #endif
1.1 anton 147: if((int)(imagepath=getenv("FORTHBIN")))
148: {
149: strcpy(imagefile,imagepath);
150:
151: if(imagefile[strlen(imagefile)-1]!='/')
152: imagefile[strlen(imagefile)]='/';
153: }
154: else
1.2 pazsan 155: {
156: strcpy(imagefile,DEFAULTBIN);
157:
158: if(imagefile[0]!=0 && imagefile[strlen(imagefile)-1]!='/')
159: imagefile[strlen(imagefile)]='/';
160: }
1.1 anton 161:
162: if(argc>1 && argv[1][0]=='@')
163: {
164: if(argv[1][1]=='/')
165: strcpy(imagefile,argv[1]+1);
166: else
167: strcpy(imagefile+strlen(imagefile),argv[1]+1);
168:
169: environ[0]-=1;
170: environ[1]+=sizeof(argv);
171: argv[1]=argv[0];
172: }
173: else
174: strcpy(imagefile+strlen(imagefile),"kernal.fi");
175:
176: exit(go_forth(loader(imagefile),3,environ));
177: }
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