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505bf312 KB |
1 | /*- |
2 | * Copyright (c) 1982 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * %sccs.include.redist.c% | |
50ad1403 | 6 | */ |
19dd4c7e | 7 | |
50ad1403 | 8 | #ifndef lint |
505bf312 KB |
9 | static char sccsid[] = "@(#)readobj.c 5.2 (Berkeley) %G%"; |
10 | #endif /* not lint */ | |
19dd4c7e ML |
11 | |
12 | /* | |
13 | * Read in the namelist from the obj file. | |
14 | */ | |
15 | ||
16 | #include "defs.h" | |
17 | #include "sym.h" | |
18 | #include "symtab.h" | |
19 | #include "object.h" | |
116c2693 | 20 | #include "objfmt.h" |
ed83e7f3 | 21 | #include "main.h" |
19dd4c7e ML |
22 | #include "mappings.h" |
23 | #include "mappings/filetab.h" | |
24 | #include "mappings/linetab.h" | |
b6c3536b | 25 | #include "objsym.rep" |
19dd4c7e | 26 | |
6c95e3fb | 27 | #define MAXSYMNO 6000 |
19dd4c7e ML |
28 | |
29 | char *objname = "obj"; | |
30 | ||
31 | LOCAL SYM *sym[MAXSYMNO]; | |
32 | ||
33 | readobj(file) | |
34 | char *file; | |
35 | { | |
b6c3536b ML |
36 | register FILE *fp; |
37 | struct pxhdr hdr; | |
38 | ||
39 | if ((fp = fopen(file, "r")) == NIL) { | |
40 | panic("can't open %s", file); | |
41 | } | |
42 | get(fp, hdr); | |
43 | if (hdr.magicnum != MAGICNUM) { | |
44 | fseek(fp, (long) (HEADER_BYTES - sizeof(struct pxhdr)), 0); | |
116c2693 | 45 | get(fp, hdr); |
ed83e7f3 | 46 | if (hdr.magicnum != MAGICNUM) { |
b6c3536b ML |
47 | fatal("%s is not a Pascal object file", file); |
48 | } | |
49 | } | |
50 | if (hdr.symtabsize == 0) { | |
51 | fatal("%s doesn't have symbolic information", file); | |
52 | } | |
53 | objsize = hdr.objsize; | |
54 | fseek(fp, (long) objsize, 1); | |
55 | if (get(fp, nlhdr) != 1) { | |
56 | panic("can't read nlhdr"); | |
57 | } | |
58 | if (option('h')) { | |
59 | printf("\nHeader information:\n"); | |
60 | printf("\tobject size %d\n", objsize); | |
61 | printf("\tsymtab size %d\n", hdr.symtabsize); | |
62 | printf("\tstringsize %d\n", nlhdr.stringsize); | |
63 | printf("\tnsyms %d\n", nlhdr.nsyms); | |
64 | printf("\tnfiles %d\n", nlhdr.nfiles); | |
65 | printf("\tnlines %d\n", nlhdr.nlines); | |
66 | } | |
67 | stringtab = alloc(nlhdr.stringsize, char); | |
68 | fread(stringtab, sizeof(char), nlhdr.stringsize, fp); | |
69 | readsyms(fp); | |
70 | readfiles(fp); | |
71 | readlines(fp); | |
72 | fclose(fp); | |
19dd4c7e ML |
73 | } |
74 | ||
75 | /* | |
02e44cb1 | 76 | * Allocate and read in file name information table. |
19dd4c7e ML |
77 | */ |
78 | ||
79 | LOCAL readfiles(fp) | |
80 | register FILE *fp; | |
81 | { | |
b6c3536b ML |
82 | register int i; |
83 | register FILETAB *ftp; | |
84 | FILETAB temp; | |
85 | ADDRESS prevaddr; | |
86 | ||
87 | filetab = alloc(nlhdr.nfiles, FILETAB); | |
88 | ftp = &filetab[0]; | |
89 | prevaddr = 0; | |
90 | for (i = 0; i < nlhdr.nfiles; i++) { | |
91 | fread(&temp, sizeof(FILETAB), 1, fp); | |
92 | if (temp.addr != prevaddr) { | |
93 | ftp++; | |
94 | } | |
95 | *ftp = temp; | |
96 | ftp->filename += (int) stringtab; | |
97 | prevaddr = ftp->addr; | |
98 | } | |
99 | nlhdr.nfiles = (ftp - &filetab[0]) + 1; | |
100 | skimsource(filetab[0].filename); | |
101 | dotpfile = filetab[0].filename; | |
19dd4c7e ML |
102 | } |
103 | ||
104 | /* | |
02e44cb1 | 105 | * Allocate and read in line number information table. |
19dd4c7e ML |
106 | */ |
107 | ||
108 | LOCAL readlines(fp) | |
109 | FILE *fp; | |
110 | { | |
b6c3536b ML |
111 | register LINENO oline; |
112 | register ADDRESS oaddr; | |
113 | register LINETAB *lp; | |
114 | FILETAB *ftp; | |
115 | OBJLINE info; | |
116 | ||
117 | if (nlhdr.nlines == 0) { | |
118 | return; | |
119 | } | |
120 | linetab = alloc(nlhdr.nlines, LINETAB); | |
121 | for (lp = &linetab[0]; lp < &linetab[nlhdr.nlines]; lp++) { | |
122 | lp->line = 0; | |
123 | } | |
124 | for (ftp = &filetab[0]; ftp < &filetab[nlhdr.nfiles]; ftp++) { | |
02e44cb1 ML |
125 | if (ftp->lineindex < nlhdr.nlines) { |
126 | linetab[ftp->lineindex].line = ftp->line; | |
127 | } | |
b6c3536b ML |
128 | } |
129 | oline = 0; | |
130 | oaddr = 0; | |
131 | for (lp = &linetab[0]; lp < &linetab[nlhdr.nlines]; lp++) { | |
132 | if (lp->line != 0) { | |
133 | oline = lp->line; | |
134 | } | |
135 | info.together = getw(fp); | |
136 | oline += info.separate.lineincr; | |
137 | oaddr += info.separate.addrincr; | |
138 | lp->line = oline; | |
139 | lp->addr = oaddr; | |
140 | } | |
19dd4c7e ML |
141 | } |
142 | ||
143 | /* | |
02e44cb1 | 144 | * Read in the symbols. |
19dd4c7e ML |
145 | */ |
146 | ||
147 | readsyms(fp) | |
148 | FILE *fp; | |
149 | { | |
b6c3536b ML |
150 | register int i; |
151 | int symno; | |
152 | ||
153 | symtab = st_creat(nlhdr.nsyms); | |
154 | for (i = 0; i < nlhdr.nsyms; i++) { | |
155 | symno = getw(fp); | |
156 | if (symno >= MAXSYMNO) { | |
6c95e3fb | 157 | panic("symbol number too large (%d)", symno); |
b6c3536b ML |
158 | } |
159 | sym[symno] = readsym(fp); | |
160 | } | |
161 | if (backpatch() != 0) { | |
162 | panic("patchlist not empty after reading namelist"); | |
163 | } | |
164 | if (program == NIL) { | |
165 | panic("no program"); | |
166 | } | |
167 | maketypes(); | |
19dd4c7e ML |
168 | } |
169 | ||
170 | typedef struct patchinfo { | |
b6c3536b ML |
171 | SYM **patchsym; |
172 | struct patchinfo *next_patch; | |
19dd4c7e ML |
173 | } PATCH; |
174 | ||
175 | LOCAL PATCH *phead; | |
176 | ||
177 | /* | |
178 | * Go through patchlist looking for symbol numbers for which the | |
179 | * sym array now has a non-NIL entry. | |
180 | * | |
181 | * Afterwards, zap the sym array. | |
182 | */ | |
183 | ||
184 | int backpatch() | |
185 | { | |
b6c3536b ML |
186 | register PATCH *p, *last, *next; |
187 | register SYM *s, **t; | |
188 | int count; | |
189 | ||
190 | last = NIL; | |
191 | count = 0; | |
192 | for (p = phead; p != NIL; p = next) { | |
193 | next = p->next_patch; | |
194 | t = p->patchsym; | |
195 | if ((s = sym[(int) *t]) != NIL) { | |
196 | *t = s; | |
197 | if (last == NIL) { | |
198 | phead = next; | |
199 | } else { | |
200 | last->next_patch = next; | |
201 | } | |
202 | dispose(p); | |
203 | } else { | |
204 | last = p; | |
205 | count++; | |
206 | } | |
207 | } | |
208 | for (t = &sym[0]; t < &sym[MAXSYMNO]; t++) { | |
209 | *t = NIL; | |
210 | } | |
211 | return(count); | |
19dd4c7e ML |
212 | } |
213 | ||
214 | /* | |
215 | * Check to see if the given pointer (really symbol number) should | |
216 | * be added to the patch list. The argument is double indirect | |
217 | * to do call by reference passing. | |
218 | */ | |
219 | ||
220 | chkpatch(p) | |
221 | SYM **p; | |
222 | { | |
b6c3536b ML |
223 | register SYM *s, *t; |
224 | register PATCH *patch; | |
225 | ||
226 | if ((s = *p) != NIL) { | |
227 | if ((t = sym[(int) s]) != NIL) { | |
228 | *p = t; | |
229 | } else { | |
230 | patch = alloc(1, PATCH); | |
231 | patch->patchsym = p; | |
232 | patch->next_patch = phead; | |
233 | phead = patch; | |
234 | } | |
235 | } | |
19dd4c7e ML |
236 | } |
237 | ||
238 | /* | |
239 | * Free all the object information. | |
240 | */ | |
241 | ||
242 | objfree() | |
243 | { | |
b6c3536b ML |
244 | register int i; |
245 | ||
246 | st_destroy(symtab); | |
247 | dispose(stringtab); | |
248 | dispose(filetab); | |
249 | dispose(linetab); | |
250 | clrfunctab(); | |
251 | for (i = 0; i < MAXSYMNO; i++) { | |
252 | sym[i] = NIL; | |
253 | } | |
19dd4c7e | 254 | } |