programs/winedbg/source.c

   1 /*
   2  * File source.c - source file handling for internal debugger.
   3  *
   4  * Copyright (C) 1997, Eric Youngdale.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24
  25 #include "debugger.h"
  26
  27 struct open_file_list
  28 {
  29     char*                       path;
  30     char*                       real_path;
  31     struct open_file_list*      next;
  32     unsigned int                size;
  33     signed int                  nlines;
  34     unsigned int*               linelist;
  35 };
  36
  37 void source_show_path(void)
  38 {
  39     const char* ptr;
  40     const char* next;
  41
  42     dbg_printf("Search list:\n");
  43     for (ptr = dbg_curr_process->search_path; ptr; ptr = next)
  44     {
  45         next = strchr(ptr, ';');
  46         if (next)
  47             dbg_printf("\t%.*s\n", (int)(next++ - ptr), ptr);
  48         else
  49             dbg_printf("\t%s\n", ptr);
  50     }
  51     dbg_printf("\n");
  52 }
  53
  54 void source_add_path(const char* path)
  55 {
  56     char*       new;
  57     unsigned    size;
  58
  59     size = strlen(path) + 1;
  60     if (dbg_curr_process->search_path)
  61     {
  62         unsigned pos = strlen(dbg_curr_process->search_path) + 1;
  63         new = HeapReAlloc(GetProcessHeap(), 0, dbg_curr_process->search_path, pos + size);
  64         if (!new) return;
  65         new[pos - 1] = ';';
  66         strcpy(&new[pos], path);
  67     }
  68     else
  69     {
  70         new = HeapAlloc(GetProcessHeap(), 0, size);
  71         if (!new) return;
  72         strcpy(new, path);
  73     }
  74     dbg_curr_process->search_path = new;
  75 }
  76
  77 void source_nuke_path(struct dbg_process* p)
  78 {
  79     HeapFree(GetProcessHeap(), 0, p->search_path);
  80     p->search_path = NULL;
  81 }
  82
  83 static  void*   source_map_file(const char* name, HANDLE* hMap, unsigned* size)
  84 {
  85     HANDLE              hFile;
  86
  87     hFile = CreateFileA(name, GENERIC_READ, FILE_SHARE_READ, NULL,
  88                         OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
  89     if (hFile == INVALID_HANDLE_VALUE) return (void*)-1;
  90     if (size != NULL && (*size = GetFileSize(hFile, NULL)) == -1) return (void*)-1;
  91     *hMap = CreateFileMappingW(hFile, NULL, PAGE_READONLY, 0, 0, NULL);
  92     CloseHandle(hFile);
  93     if (!*hMap) return (void*)-1;
  94     return MapViewOfFile(*hMap, FILE_MAP_READ, 0, 0, 0);
  95 }
  96
  97 static void     source_unmap_file(void* addr, HANDLE hMap)
  98 {
  99     UnmapViewOfFile(addr);
 100     CloseHandle(hMap);
 101 }
 102
 103 static struct open_file_list* source_search_open_file(const char* name)
 104 {
 105     struct open_file_list*      ol;
 106
 107     for (ol = dbg_curr_process->source_ofiles; ol; ol = ol->next)
 108     {
 109         if (strcmp(ol->path, name) == 0) break;
 110     }
 111     return ol;
 112 }
 113
 114 static BOOL     source_locate_file(const char* srcfile, char* path)
 115 {
 116     BOOL        found = FALSE;
 117
 118     if (GetFileAttributesA(srcfile) != INVALID_FILE_ATTRIBUTES)
 119     {
 120         strcpy(path, srcfile);
 121         found = TRUE;
 122     }
 123     else if (dbg_curr_process->search_path)
 124     {
 125         const char* spath;
 126
 127         spath = srcfile;
 128         while (!found)
 129         {
 130             while (*spath && *spath != '/' && *spath != '\\') spath++;
 131             if (!*spath) break;
 132             spath++;
 133             found = SearchPathA(dbg_curr_process->search_path, spath, NULL, MAX_PATH, path, NULL);
 134         }
 135     }
 136     return found;
 137 }
 138
 139 static struct open_file_list* source_add_file(const char* name, const char* realpath)
 140 {
 141     struct open_file_list*      ol;
 142     size_t                      sz, nlen;
 143
 144     sz = sizeof(*ol);
 145     nlen = strlen(name) + 1;
 146     if (realpath) sz += strlen(realpath) + 1;
 147     ol = HeapAlloc(GetProcessHeap(), 0, sz + nlen);
 148     if (!ol) return NULL;
 149     strcpy(ol->path = (char*)(ol + 1), name);
 150     if (realpath)
 151         strcpy(ol->real_path = ol->path + nlen, realpath);
 152     else
 153         ol->real_path = NULL;
 154     ol->next = dbg_curr_process->source_ofiles;
 155     ol->nlines = 0;
 156     ol->linelist = NULL;
 157     ol->size = 0;
 158     return dbg_curr_process->source_ofiles = ol;
 159 }
 160
 161 static int source_display(const char* sourcefile, int start, int end)
 162 {
 163     char*                       addr;
 164     int                         i;
 165     struct open_file_list*      ol;
 166     int                         nlines;
 167     const char*                 basename = NULL;
 168     char*                       pnt;
 169     int                         rtn;
 170     HANDLE                      hMap;
 171     char                        tmppath[MAX_PATH];
 172
 173     /*
 174      * First see whether we have the file open already.  If so, then
 175      * use that, otherwise we have to try and open it.
 176      */
 177     ol = source_search_open_file(sourcefile);
 178
 179     if (ol == NULL)
 180     {
 181         /*
 182          * Try again, stripping the path from the opened file.
 183          */
 184         basename = strrchr(sourcefile, '\\');
 185         if (!basename) basename = strrchr(sourcefile, '/');
 186         if (!basename) basename = sourcefile;
 187         else basename++;
 188
 189         ol = source_search_open_file(basename);
 190     }
 191
 192     if (ol == NULL)
 193     {
 194         /*
 195          * Crapola.  We need to try and open the file.
 196          */
 197         if (!source_locate_file(sourcefile, tmppath))
 198         {
 199             if (dbg_interactiveP)
 200             {
 201                 char zbuf[256];
 202
 203                 for (;;)
 204                 {
 205                     size_t      len;
 206                     /*
 207                      * Still couldn't find it.  Ask user for path to add.
 208                      */
 209                     snprintf(zbuf, sizeof(zbuf), "Enter path to file '%s' (<cr> to end search): ", sourcefile);
 210                     input_read_line(zbuf, tmppath, sizeof(tmppath));
 211                     if (!(len = strlen(tmppath))) break;
 212
 213                     /* append '/' if missing at the end */
 214                     if (tmppath[len - 1] != '/' && tmppath[len - 1] != '\\')
 215                         tmppath[len++] = '/';
 216                     strcpy(&tmppath[len], basename);
 217                     if (GetFileAttributesA(tmppath) != INVALID_FILE_ATTRIBUTES)
 218                         break;
 219                     dbg_printf("Unable to access file '%s'\n", tmppath);
 220                 }
 221             }
 222             else
 223             {
 224                 dbg_printf("Unable to access file '%s'\n", sourcefile);
 225                 tmppath[0] = '\0';
 226             }
 227
 228             if (!tmppath[0])
 229             {
 230                 /*
 231                  * OK, I guess the user doesn't really want to see it
 232                  * after all.
 233                  */
 234                 ol = source_add_file(sourcefile, NULL);
 235                 return FALSE;
 236             }
 237         }
 238         /*
 239          * Create header for file.
 240          */
 241         ol = source_add_file(sourcefile, tmppath);
 242
 243         addr = source_map_file(tmppath, &hMap, &ol->size);
 244         if (addr == (char*)-1) return FALSE;
 245         /*
 246          * Now build up the line number mapping table.
 247          */
 248         ol->nlines = 1;
 249         pnt = addr;
 250         while (pnt < addr + ol->size)
 251         {
 252             if (*pnt++ == '\n') ol->nlines++;
 253         }
 254
 255         ol->nlines++;
 256         ol->linelist = HeapAlloc(GetProcessHeap(), 0, ol->nlines * sizeof(unsigned int));
 257
 258         nlines = 0;
 259         pnt = addr;
 260         ol->linelist[nlines++] = 0;
 261         while (pnt < addr + ol->size)
 262         {
 263             if (*pnt++ == '\n') ol->linelist[nlines++] = pnt - addr;
 264         }
 265         ol->linelist[nlines++] = pnt - addr;
 266
 267     }
 268     else
 269     {
 270         addr = source_map_file(ol->real_path, &hMap, NULL);
 271         if (addr == (char*)-1) return FALSE;
 272     }
 273     /*
 274      * All we need to do is to display the source lines here.
 275      */
 276     rtn = FALSE;
 277     for (i = start - 1; i <= end - 1; i++)
 278     {
 279         char    buffer[1024];
 280
 281         if (i < 0 || i >= ol->nlines - 1) continue;
 282
 283         rtn = TRUE;
 284         memset(&buffer, 0, sizeof(buffer));
 285         if (ol->linelist[i+1] != ol->linelist[i])
 286         {
 287             memcpy(&buffer, addr + ol->linelist[i],
 288                    (ol->linelist[i+1] - ol->linelist[i]) - 1);
 289         }
 290         dbg_printf("%d\t%s\n", i + 1, buffer);
 291     }
 292
 293     source_unmap_file(addr, hMap);
 294     return rtn;
 295 }
 296
 297 void source_list(IMAGEHLP_LINE64* src1, IMAGEHLP_LINE64* src2, int delta)
 298 {
 299     int         end;
 300     int         start;
 301     const char* sourcefile;
 302
 303     /*
 304      * We need to see what source file we need.  Hopefully we only have
 305      * one specified, otherwise we might as well punt.
 306      */
 307     if (src1 && src2 && src1->FileName && src2->FileName &&
 308         strcmp(src1->FileName, src2->FileName) != 0)
 309     {
 310         dbg_printf("Ambiguous source file specification.\n");
 311         return;
 312     }
 313
 314     sourcefile = NULL;
 315     if (src1 && src1->FileName) sourcefile = src1->FileName;
 316     if (!sourcefile && src2 && src2->FileName) sourcefile = src2->FileName;
 317     if (!sourcefile) sourcefile = dbg_curr_process->source_current_file;
 318
 319     /*
 320      * Now figure out the line number range to be listed.
 321      */
 322     start = end = -1;
 323
 324     if (src1) start = src1->LineNumber;
 325     if (src2) end   = src2->LineNumber;
 326     if (start == -1 && end == -1)
 327     {
 328         if (delta < 0)
 329         {
 330             end = dbg_curr_process->source_start_line;
 331             start = end + delta;
 332         }
 333         else
 334         {
 335             start = dbg_curr_process->source_end_line;
 336             end = start + delta;
 337         }
 338     }
 339     else if (start == -1) start = end + delta;
 340     else if (end == -1)   end = start + delta;
 341
 342     /*
 343      * Now call this function to do the dirty work.
 344      */
 345     source_display(sourcefile, start, end);
 346
 347     if (sourcefile != dbg_curr_process->source_current_file)
 348         strcpy(dbg_curr_process->source_current_file, sourcefile);
 349     dbg_curr_process->source_start_line = start;
 350     dbg_curr_process->source_end_line = end;
 351 }
 352
 353 void source_list_from_addr(const ADDRESS64* addr, int nlines)
 354 {
 355     IMAGEHLP_LINE64     il;
 356     ADDRESS64           la;
 357     DWORD               disp;
 358
 359     if (!addr)
 360     {
 361         memory_get_current_pc(&la);
 362         addr = &la;
 363     }
 364
 365     il.SizeOfStruct = sizeof(il);
 366     if (SymGetLineFromAddr64(dbg_curr_process->handle,
 367                              (DWORD_PTR)memory_to_linear_addr(addr),
 368                              &disp, &il))
 369         source_list(&il, NULL, nlines);
 370 }
 371
 372 void source_free_files(struct dbg_process* p)
 373 {
 374     struct open_file_list*      ofile;
 375     struct open_file_list*      ofile_next;
 376
 377     for (ofile = p->source_ofiles; ofile; ofile = ofile_next)
 378     {
 379         ofile_next = ofile->next;
 380         HeapFree(GetProcessHeap(), 0, ofile->linelist);
 381         HeapFree(GetProcessHeap(), 0, ofile);
 382     }
 383 }