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1.1 root 1: /* Output xcoff-format symbol table information from GNU compiler.
2: Copyright (C) 1992 Free Software Foundation, Inc.
3:
4: This file is part of GNU CC.
5:
6: GNU CC is free software; you can redistribute it and/or modify
7: it under the terms of the GNU General Public License as published by
8: the Free Software Foundation; either version 2, or (at your option)
9: any later version.
10:
11: GNU CC is distributed in the hope that it will be useful,
12: but WITHOUT ANY WARRANTY; without even the implied warranty of
13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14: GNU General Public License for more details.
15:
16: You should have received a copy of the GNU General Public License
17: along with GNU CC; see the file COPYING. If not, write to
18: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
19:
20:
21: /* Output xcoff-format symbol table data. The main functionality is contained
22: in dbxout.c. This file implements the sdbout-like parts of the xcoff
23: interface. Many functions are very similar to their counterparts in
24: sdbout.c. */
25:
26: /* Include this first, because it may define MIN and MAX. */
27: #include <stdio.h>
28:
29: #include "config.h"
30: #include "tree.h"
31: #include "rtl.h"
32: #include "flags.h"
33:
34: #ifdef XCOFF_DEBUGGING_INFO
35:
36: /* This defines the C_* storage classes. */
37: #include <dbxstclass.h>
38:
39: #include "xcoffout.h"
40:
41: #if defined (USG) || defined (NO_STAB_H)
42: #include "gstab.h"
43: #else
44: #include <stab.h>
45:
46: /* This is a GNU extension we need to reference in this file. */
47: #ifndef N_CATCH
48: #define N_CATCH 0x54
49: #endif
50: #endif
51:
52: /* Line number of beginning of current function, minus one.
53: Negative means not in a function or not using xcoff. */
54:
55: int xcoff_begin_function_line = -1;
56:
57: /* Name of the current include file. */
58:
59: char *xcoff_current_include_file;
60:
61: /* Name of the current function file. This is the file the `.bf' is
62: emitted from. In case a line is emitted from a different file,
63: (by including that file of course), then the line number will be
64: absolute. */
65:
66: char *xcoff_current_function_file;
67:
68: /* Names of bss and data sections. These should be unique names for each
69: compilation unit. */
70:
71: char *xcoff_bss_section_name;
72: char *xcoff_private_data_section_name;
73: char *xcoff_read_only_section_name;
74:
75: /* Macro definitions used below. */
76: /* Ensure we don't output a negative line number. */
77: #define MAKE_LINE_SAFE(LINE) \
78: if (LINE <= xcoff_begin_function_line) \
79: LINE = xcoff_begin_function_line + 1 \
80:
81: #define ASM_OUTPUT_LFB(FILE,LINENUM) \
82: { \
83: if (xcoff_begin_function_line == -1) \
84: { \
85: xcoff_begin_function_line = (LINENUM) - 1;\
86: fprintf (FILE, "\t.bf\t%d\n", (LINENUM)); \
87: } \
88: xcoff_current_function_file \
89: = (xcoff_current_include_file \
90: ? xcoff_current_include_file : main_input_filename); \
91: }
92:
93: #define ASM_OUTPUT_LFE(FILE,LINENUM) \
94: do { \
95: int linenum = LINENUM; \
96: MAKE_LINE_SAFE (linenum); \
97: fprintf (FILE, "\t.ef\t%d\n", ABS_OR_RELATIVE_LINENO (linenum)); \
98: xcoff_begin_function_line = -1; \
99: } while (0)
100:
101: #define ASM_OUTPUT_LBB(FILE,LINENUM,BLOCKNUM) \
102: do { \
103: int linenum = LINENUM; \
104: MAKE_LINE_SAFE (linenum); \
105: fprintf (FILE, "\t.bb\t%d\n", ABS_OR_RELATIVE_LINENO (linenum)); \
106: } while (0)
107:
108: #define ASM_OUTPUT_LBE(FILE,LINENUM,BLOCKNUM) \
109: do { \
110: int linenum = LINENUM; \
111: MAKE_LINE_SAFE (linenum); \
112: fprintf (FILE, "\t.eb\t%d\n", ABS_OR_RELATIVE_LINENO (linenum)); \
113: } while (0)
114:
115: /* Support routines for XCOFF debugging info. */
116:
117: /* Assign NUMBER as the stabx type number for the type described by NAME.
118: Search all decls in the list SYMS to find the type NAME. */
119:
120: static void
121: assign_type_number (syms, name, number)
122: tree syms;
123: char *name;
124: int number;
125: {
126: tree decl;
127:
128: for (decl = syms; decl; decl = TREE_CHAIN (decl))
129: if (DECL_NAME (decl)
130: && strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), name) == 0)
131: {
132: TREE_ASM_WRITTEN (decl) = 1;
133: TYPE_SYMTAB_ADDRESS (TREE_TYPE (decl)) = number;
134: }
135: }
136:
137: /* Setup gcc primitive types to use the XCOFF built-in type numbers where
138: possible. */
139:
140: void
141: xcoff_output_standard_types (syms)
142: tree syms;
143: {
144: /* Handle built-in C types here. */
145:
146: assign_type_number (syms, "int", -1);
147: assign_type_number (syms, "char", -2);
148: assign_type_number (syms, "short int", -3);
149: assign_type_number (syms, "long int", -4);
150: assign_type_number (syms, "unsigned char", -5);
151: assign_type_number (syms, "signed char", -6);
152: assign_type_number (syms, "short unsigned int", -7);
153: assign_type_number (syms, "unsigned int", -8);
154: /* No such type "unsigned". */
155: assign_type_number (syms, "long unsigned int", -10);
156: assign_type_number (syms, "void", -11);
157: assign_type_number (syms, "float", -12);
158: assign_type_number (syms, "double", -13);
159: assign_type_number (syms, "long double", -14);
160: /* Pascal and Fortran types run from -15 to -29. */
161: /* No such type "wchar". */
162:
163: /* "long long int", and "long long unsigned int", are not handled here,
164: because there are no predefined types that match them. */
165:
166: /* ??? Should also handle built-in C++ and Obj-C types. There perhaps
167: aren't any that C doesn't already have. */
168: }
169:
170: /* Print an error message for unrecognized stab codes. */
171:
172: #define UNKNOWN_STAB(STR) \
173: do { \
174: fprintf(stderr, "Error, unknown stab %s: : 0x%x\n", STR, stab); \
175: fflush (stderr); \
176: } while (0)
177:
178: /* Conversion routine from BSD stabs to AIX storage classes. */
179:
180: int
181: stab_to_sclass (stab)
182: int stab;
183: {
184: switch (stab)
185: {
186: case N_GSYM:
187: return C_GSYM;
188:
189: case N_FNAME:
190: UNKNOWN_STAB ("N_FNAME");
191: abort();
192:
193: case N_FUN:
194: return C_FUN;
195:
196: case N_STSYM:
197: case N_LCSYM:
198: return C_STSYM;
199:
200: #ifdef N_MAIN
201: case N_MAIN:
202: UNKNOWN_STAB ("N_MAIN");
203: abort ();
204: #endif
205:
206: case N_RSYM:
207: return C_RSYM;
208:
209: case N_SSYM:
210: UNKNOWN_STAB ("N_SSYM");
211: abort ();
212:
213: case N_RPSYM:
214: return C_RPSYM;
215:
216: case N_PSYM:
217: return C_PSYM;
218: case N_LSYM:
219: return C_LSYM;
220: case N_DECL:
221: return C_DECL;
222: case N_ENTRY:
223: return C_ENTRY;
224:
225: case N_SO:
226: UNKNOWN_STAB ("N_SO");
227: abort ();
228:
229: case N_SOL:
230: UNKNOWN_STAB ("N_SOL");
231: abort ();
232:
233: case N_SLINE:
234: UNKNOWN_STAB ("N_SLINE");
235: abort ();
236:
237: #ifdef N_DSLINE
238: case N_DSLINE:
239: UNKNOWN_STAB ("N_DSLINE");
240: abort ();
241: #endif
242:
243: #ifdef N_BSLINE
244: case N_BSLINE:
245: UNKNOWN_STAB ("N_BSLINE");
246: abort ();
247: #endif
248: #if 0
249: /* This has the same value as N_BSLINE. */
250: case N_BROWS:
251: UNKNOWN_STAB ("N_BROWS");
252: abort ();
253: #endif
254:
255: #ifdef N_BINCL
256: case N_BINCL:
257: UNKNOWN_STAB ("N_BINCL");
258: abort ();
259: #endif
260:
261: #ifdef N_EINCL
262: case N_EINCL:
263: UNKNOWN_STAB ("N_EINCL");
264: abort ();
265: #endif
266:
267: #ifdef N_EXCL
268: case N_EXCL:
269: UNKNOWN_STAB ("N_EXCL");
270: abort ();
271: #endif
272:
273: case N_LBRAC:
274: UNKNOWN_STAB ("N_LBRAC");
275: abort ();
276:
277: case N_RBRAC:
278: UNKNOWN_STAB ("N_RBRAC");
279: abort ();
280:
281: case N_BCOMM:
282: return C_BCOMM;
283: case N_ECOMM:
284: return C_ECOMM;
285: case N_ECOML:
286: return C_ECOML;
287:
288: case N_LENG:
289: UNKNOWN_STAB ("N_LENG");
290: abort ();
291:
292: case N_PC:
293: UNKNOWN_STAB ("N_PC");
294: abort ();
295:
296: #ifdef N_M2C
297: case N_M2C:
298: UNKNOWN_STAB ("N_M2C");
299: abort ();
300: #endif
301:
302: #ifdef N_SCOPE
303: case N_SCOPE:
304: UNKNOWN_STAB ("N_SCOPE");
305: abort ();
306: #endif
307:
308: case N_CATCH:
309: UNKNOWN_STAB ("N_CATCH");
310: abort ();
311:
312: default:
313: UNKNOWN_STAB ("default");
314: abort ();
315: }
316: }
317:
318: /* In XCOFF, we have to have this .bf before the function prologue.
319: Rely on the value of `dbx_begin_function_line' not to duplicate .bf. */
320:
321: void
322: xcoffout_output_first_source_line (file, last_linenum)
323: FILE *file;
324: int last_linenum;
325: {
326: ASM_OUTPUT_LFB (file, last_linenum);
327: dbxout_parms (DECL_ARGUMENTS (current_function_decl));
328: ASM_OUTPUT_SOURCE_LINE (file, last_linenum);
329: }
330:
331: /* Output the symbols defined in block number DO_BLOCK.
332: Set NEXT_BLOCK_NUMBER to 0 before calling.
333:
334: This function works by walking the tree structure of blocks,
335: counting blocks until it finds the desired block. */
336:
337: static int do_block = 0;
338:
339: static int next_block_number;
340:
341: static void
342: xcoffout_block (block, depth, args)
343: register tree block;
344: int depth;
345: tree args;
346: {
347: while (block)
348: {
349: /* Ignore blocks never expanded or otherwise marked as real. */
350: if (TREE_USED (block))
351: {
352: /* When we reach the specified block, output its symbols. */
353: if (next_block_number == do_block)
354: {
355: /* Output the syms of the block. */
356: if (debug_info_level != DINFO_LEVEL_TERSE || depth == 0)
357: dbxout_syms (BLOCK_VARS (block));
358: if (args)
359: dbxout_reg_parms (args);
360:
361: /* We are now done with the block. Don't go to inner blocks. */
362: return;
363: }
364: /* If we are past the specified block, stop the scan. */
365: else if (next_block_number >= do_block)
366: return;
367:
368: next_block_number++;
369:
370: /* Output the subblocks. */
371: xcoffout_block (BLOCK_SUBBLOCKS (block), depth + 1, NULL_TREE);
372: }
373: block = BLOCK_CHAIN (block);
374: }
375: }
376:
377: /* Describe the beginning of an internal block within a function.
378: Also output descriptions of variables defined in this block.
379:
380: N is the number of the block, by order of beginning, counting from 1,
381: and not counting the outermost (function top-level) block.
382: The blocks match the BLOCKs in DECL_INITIAL (current_function_decl),
383: if the count starts at 0 for the outermost one. */
384:
385: void
386: xcoffout_begin_block (file, line, n)
387: FILE *file;
388: int line;
389: int n;
390: {
391: tree decl = current_function_decl;
392:
393: ASM_OUTPUT_LBB (file, line, n);
394:
395: do_block = n;
396: next_block_number = 0;
397: xcoffout_block (DECL_INITIAL (decl), 0, DECL_ARGUMENTS (decl));
398: }
399:
400: /* Describe the end line-number of an internal block within a function. */
401:
402: void
403: xcoffout_end_block (file, line, n)
404: FILE *file;
405: int line;
406: int n;
407: {
408: ASM_OUTPUT_LBE (file, line, n);
409: }
410:
411: /* Called at beginning of function (before prologue).
412: Declare function as needed for debugging. */
413:
414: void
415: xcoffout_declare_function (file, decl, name)
416: FILE *file;
417: tree decl;
418: char *name;
419: {
420: char *n = name;
421: int i;
422:
423: for (i = 0; name[i]; ++i)
424: {
425: if (name[i] == '[')
426: {
427: n = (char *) alloca (i + 1);
428: strncpy (n, name, i);
429: n[i] = '\0';
430: break;
431: }
432: }
433:
434: /* Any pending .bi or .ei must occur before the .function psuedo op.
435: Otherwise debuggers will think that the function is in the previous
436: file and/or at the wrong line number. */
437: dbxout_source_file (file, DECL_SOURCE_FILE (decl));
438: dbxout_symbol (decl, 0);
439: fprintf (file, "\t.function .%s,.%s,16,044,FE..%s-.%s\n", n, n, n, n);
440: }
441:
442: /* Called at beginning of function body (after prologue).
443: Record the function's starting line number, so we can output
444: relative line numbers for the other lines.
445: Record the file name that this function is contained in. */
446:
447: void
448: xcoffout_begin_function (file, last_linenum)
449: FILE *file;
450: int last_linenum;
451: {
452: ASM_OUTPUT_LFB (file, last_linenum);
453: }
454:
455: /* Called at end of function (before epilogue).
456: Describe end of outermost block. */
457:
458: void
459: xcoffout_end_function (file, last_linenum)
460: FILE *file;
461: int last_linenum;
462: {
463: ASM_OUTPUT_LFE (file, last_linenum);
464: }
465:
466: /* Output xcoff info for the absolute end of a function.
467: Called after the epilogue is output. */
468:
469: void
470: xcoffout_end_epilogue (file)
471: FILE *file;
472: {
473: /* We need to pass the correct function size to .function, otherwise,
474: the xas assembler can't figure out the correct size for the function
475: aux entry. So, we emit a label after the last instruction which can
476: be used by the .function pseudo op to calculate the function size. */
477:
478: char *fname = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);
479: if (*fname == '*')
480: ++fname;
481: fprintf (file, "FE..");
482: ASM_OUTPUT_LABEL (file, fname);
483: }
484: #endif /* XCOFF_DEBUGGING_INFO */
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