/* * Edit the ELF file residing at @p path, changing all occurrences of * the path @p server_path to @p client_path in the debugging info. * * We're a bit sloppy about that; rather than properly parsing * the DWARF debug info, finding the DW_AT_comp_dir (compilation working * directory) field and the DW_AT_name (source file name) field, * we just do a search-and-replace in the ".debug_info" and ".debug_str" * sections. But this is good enough. * * Returns 0 on success (whether or not the ".debug_info" and ".debug_str" * sections were found or updated). * Returns 1 on serious error that should cause distcc to fail. */ int dcc_fix_debug_info(const char *path, const char *client_path, const char *server_path) { #ifndef HAVE_ELF_H rs_trace("no <elf.h>, so can't change %s to %s in debug info for %s", server_path, client_path, path); return 0; #else /* * We can only safely replace a string with another of exactly * the same length. (Replacing a string with a shorter string * results in errors from gdb.) * So we append trailing slashes on the client side path. */ size_t client_path_len = strlen(client_path); size_t server_path_len = strlen(server_path); assert(client_path_len <= server_path_len); char *client_path_plus_slashes = malloc(server_path_len + 1); if (!client_path_plus_slashes) { rs_log_crit("failed to allocate memory"); return 1; } strcpy(client_path_plus_slashes, client_path); while (client_path_len < server_path_len) { client_path_plus_slashes[client_path_len++] = '/'; } client_path_plus_slashes[client_path_len] = '\0'; rs_log_info("client_path_plus_slashes = %s", client_path_plus_slashes); return update_debug_info(path, server_path, client_path_plus_slashes); #endif }
/* * get_debug_info returns the debug information for the case when the instruction * at the given program counter is being executed. */ struct DebugInfo get_debug_info(int pc) { struct DebugInfo info; struct SymbolTableEntry *stab_entry = NULL; init_debug_info(&info); stab_entry = (struct SymbolTableEntry *) STAB_BEGIN; while (stab_entry != STAB_END) { update_debug_info(&info, stab_entry); if ((uint32_t) info.source_line_address >= (uint32_t) pc) break; stab_entry++; } return info; }