Commit | Line | Data |
---|---|---|
19dd4c7e ML |
1 | /* Copyright (c) 1982 Regents of the University of California */ |
2 | ||
6c95e3fb | 3 | static char sccsid[] = "@(#)readobj.c 1.6 %G%"; |
19dd4c7e ML |
4 | |
5 | /* | |
6 | * Read in the namelist from the obj file. | |
7 | */ | |
8 | ||
9 | #include "defs.h" | |
10 | #include "sym.h" | |
11 | #include "symtab.h" | |
12 | #include "object.h" | |
116c2693 | 13 | #include "objfmt.h" |
ed83e7f3 | 14 | #include "main.h" |
19dd4c7e ML |
15 | #include "mappings.h" |
16 | #include "mappings/filetab.h" | |
17 | #include "mappings/linetab.h" | |
b6c3536b | 18 | #include "objsym.rep" |
19dd4c7e | 19 | |
6c95e3fb | 20 | #define MAXSYMNO 6000 |
19dd4c7e ML |
21 | |
22 | char *objname = "obj"; | |
23 | ||
24 | LOCAL SYM *sym[MAXSYMNO]; | |
25 | ||
26 | readobj(file) | |
27 | char *file; | |
28 | { | |
b6c3536b ML |
29 | register FILE *fp; |
30 | struct pxhdr hdr; | |
31 | ||
32 | if ((fp = fopen(file, "r")) == NIL) { | |
33 | panic("can't open %s", file); | |
34 | } | |
35 | get(fp, hdr); | |
36 | if (hdr.magicnum != MAGICNUM) { | |
37 | fseek(fp, (long) (HEADER_BYTES - sizeof(struct pxhdr)), 0); | |
116c2693 | 38 | get(fp, hdr); |
ed83e7f3 | 39 | if (hdr.magicnum != MAGICNUM) { |
b6c3536b ML |
40 | fatal("%s is not a Pascal object file", file); |
41 | } | |
42 | } | |
43 | if (hdr.symtabsize == 0) { | |
44 | fatal("%s doesn't have symbolic information", file); | |
45 | } | |
46 | objsize = hdr.objsize; | |
47 | fseek(fp, (long) objsize, 1); | |
48 | if (get(fp, nlhdr) != 1) { | |
49 | panic("can't read nlhdr"); | |
50 | } | |
51 | if (option('h')) { | |
52 | printf("\nHeader information:\n"); | |
53 | printf("\tobject size %d\n", objsize); | |
54 | printf("\tsymtab size %d\n", hdr.symtabsize); | |
55 | printf("\tstringsize %d\n", nlhdr.stringsize); | |
56 | printf("\tnsyms %d\n", nlhdr.nsyms); | |
57 | printf("\tnfiles %d\n", nlhdr.nfiles); | |
58 | printf("\tnlines %d\n", nlhdr.nlines); | |
59 | } | |
60 | stringtab = alloc(nlhdr.stringsize, char); | |
61 | fread(stringtab, sizeof(char), nlhdr.stringsize, fp); | |
62 | readsyms(fp); | |
63 | readfiles(fp); | |
64 | readlines(fp); | |
65 | fclose(fp); | |
19dd4c7e ML |
66 | } |
67 | ||
68 | /* | |
02e44cb1 | 69 | * Allocate and read in file name information table. |
19dd4c7e ML |
70 | */ |
71 | ||
72 | LOCAL readfiles(fp) | |
73 | register FILE *fp; | |
74 | { | |
b6c3536b ML |
75 | register int i; |
76 | register FILETAB *ftp; | |
77 | FILETAB temp; | |
78 | ADDRESS prevaddr; | |
79 | ||
80 | filetab = alloc(nlhdr.nfiles, FILETAB); | |
81 | ftp = &filetab[0]; | |
82 | prevaddr = 0; | |
83 | for (i = 0; i < nlhdr.nfiles; i++) { | |
84 | fread(&temp, sizeof(FILETAB), 1, fp); | |
85 | if (temp.addr != prevaddr) { | |
86 | ftp++; | |
87 | } | |
88 | *ftp = temp; | |
89 | ftp->filename += (int) stringtab; | |
90 | prevaddr = ftp->addr; | |
91 | } | |
92 | nlhdr.nfiles = (ftp - &filetab[0]) + 1; | |
93 | skimsource(filetab[0].filename); | |
94 | dotpfile = filetab[0].filename; | |
19dd4c7e ML |
95 | } |
96 | ||
97 | /* | |
02e44cb1 | 98 | * Allocate and read in line number information table. |
19dd4c7e ML |
99 | */ |
100 | ||
101 | LOCAL readlines(fp) | |
102 | FILE *fp; | |
103 | { | |
b6c3536b ML |
104 | register LINENO oline; |
105 | register ADDRESS oaddr; | |
106 | register LINETAB *lp; | |
107 | FILETAB *ftp; | |
108 | OBJLINE info; | |
109 | ||
110 | if (nlhdr.nlines == 0) { | |
111 | return; | |
112 | } | |
113 | linetab = alloc(nlhdr.nlines, LINETAB); | |
114 | for (lp = &linetab[0]; lp < &linetab[nlhdr.nlines]; lp++) { | |
115 | lp->line = 0; | |
116 | } | |
117 | for (ftp = &filetab[0]; ftp < &filetab[nlhdr.nfiles]; ftp++) { | |
02e44cb1 ML |
118 | if (ftp->lineindex < nlhdr.nlines) { |
119 | linetab[ftp->lineindex].line = ftp->line; | |
120 | } | |
b6c3536b ML |
121 | } |
122 | oline = 0; | |
123 | oaddr = 0; | |
124 | for (lp = &linetab[0]; lp < &linetab[nlhdr.nlines]; lp++) { | |
125 | if (lp->line != 0) { | |
126 | oline = lp->line; | |
127 | } | |
128 | info.together = getw(fp); | |
129 | oline += info.separate.lineincr; | |
130 | oaddr += info.separate.addrincr; | |
131 | lp->line = oline; | |
132 | lp->addr = oaddr; | |
133 | } | |
19dd4c7e ML |
134 | } |
135 | ||
136 | /* | |
02e44cb1 | 137 | * Read in the symbols. |
19dd4c7e ML |
138 | */ |
139 | ||
140 | readsyms(fp) | |
141 | FILE *fp; | |
142 | { | |
b6c3536b ML |
143 | register int i; |
144 | int symno; | |
145 | ||
146 | symtab = st_creat(nlhdr.nsyms); | |
147 | for (i = 0; i < nlhdr.nsyms; i++) { | |
148 | symno = getw(fp); | |
149 | if (symno >= MAXSYMNO) { | |
6c95e3fb | 150 | panic("symbol number too large (%d)", symno); |
b6c3536b ML |
151 | } |
152 | sym[symno] = readsym(fp); | |
153 | } | |
154 | if (backpatch() != 0) { | |
155 | panic("patchlist not empty after reading namelist"); | |
156 | } | |
157 | if (program == NIL) { | |
158 | panic("no program"); | |
159 | } | |
160 | maketypes(); | |
19dd4c7e ML |
161 | } |
162 | ||
163 | typedef struct patchinfo { | |
b6c3536b ML |
164 | SYM **patchsym; |
165 | struct patchinfo *next_patch; | |
19dd4c7e ML |
166 | } PATCH; |
167 | ||
168 | LOCAL PATCH *phead; | |
169 | ||
170 | /* | |
171 | * Go through patchlist looking for symbol numbers for which the | |
172 | * sym array now has a non-NIL entry. | |
173 | * | |
174 | * Afterwards, zap the sym array. | |
175 | */ | |
176 | ||
177 | int backpatch() | |
178 | { | |
b6c3536b ML |
179 | register PATCH *p, *last, *next; |
180 | register SYM *s, **t; | |
181 | int count; | |
182 | ||
183 | last = NIL; | |
184 | count = 0; | |
185 | for (p = phead; p != NIL; p = next) { | |
186 | next = p->next_patch; | |
187 | t = p->patchsym; | |
188 | if ((s = sym[(int) *t]) != NIL) { | |
189 | *t = s; | |
190 | if (last == NIL) { | |
191 | phead = next; | |
192 | } else { | |
193 | last->next_patch = next; | |
194 | } | |
195 | dispose(p); | |
196 | } else { | |
197 | last = p; | |
198 | count++; | |
199 | } | |
200 | } | |
201 | for (t = &sym[0]; t < &sym[MAXSYMNO]; t++) { | |
202 | *t = NIL; | |
203 | } | |
204 | return(count); | |
19dd4c7e ML |
205 | } |
206 | ||
207 | /* | |
208 | * Check to see if the given pointer (really symbol number) should | |
209 | * be added to the patch list. The argument is double indirect | |
210 | * to do call by reference passing. | |
211 | */ | |
212 | ||
213 | chkpatch(p) | |
214 | SYM **p; | |
215 | { | |
b6c3536b ML |
216 | register SYM *s, *t; |
217 | register PATCH *patch; | |
218 | ||
219 | if ((s = *p) != NIL) { | |
220 | if ((t = sym[(int) s]) != NIL) { | |
221 | *p = t; | |
222 | } else { | |
223 | patch = alloc(1, PATCH); | |
224 | patch->patchsym = p; | |
225 | patch->next_patch = phead; | |
226 | phead = patch; | |
227 | } | |
228 | } | |
19dd4c7e ML |
229 | } |
230 | ||
231 | /* | |
232 | * Free all the object information. | |
233 | */ | |
234 | ||
235 | objfree() | |
236 | { | |
b6c3536b ML |
237 | register int i; |
238 | ||
239 | st_destroy(symtab); | |
240 | dispose(stringtab); | |
241 | dispose(filetab); | |
242 | dispose(linetab); | |
243 | clrfunctab(); | |
244 | for (i = 0; i < MAXSYMNO; i++) { | |
245 | sym[i] = NIL; | |
246 | } | |
19dd4c7e | 247 | } |