native_client_sdk/src/libraries/xray/parsesymbols.c

   1 /* Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2  * Use of this source code is governed by a BSD-style license that can be
   3  * found in the LICENSE file. */
   4
   5
   6 /* XRay -- a simple profiler for Native Client */
   7
   8 #include <stdint.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <unistd.h>
  13 #include "xray/xray_priv.h"
  14
  15 #if defined(XRAY)
  16
  17 struct XRaySymbol* XRaySymbolTableCreateEntry(struct XRaySymbolTable* symtab,
  18                                               char* line) {
  19   uint32_t addr;
  20   unsigned int uiaddr;
  21   char symbol_text[XRAY_LINE_SIZE];
  22   char* parsed_symbol;
  23   char* newln;
  24   if (2 != sscanf(line, "%x %1023s", &uiaddr, symbol_text))
  25     return NULL;
  26   if (uiaddr > 0x07FFFFFF) {
  27     fprintf(stderr, "While parsing the mapfile, XRay encountered:\n");
  28     fprintf(stderr, "%s\n", line);
  29     fprintf(stderr,
  30         "XRay only works with code addresses 0x00000000 - 0x07FFFFFF\n");
  31     fprintf(stderr, "All functions must reside in this address space.\n");
  32     exit(-1);
  33   }
  34   addr = (uint32_t)uiaddr;
  35   parsed_symbol = strstr(line, symbol_text);
  36   newln = strstr(parsed_symbol, "\n");
  37   if (NULL != newln) {
  38     *newln = 0;
  39   }
  40   return XRaySymbolTableAddByName(symtab, parsed_symbol, addr);
  41 }
  42
  43
  44 void XRaySymbolTableParseMapfile(struct XRaySymbolTable* symtab,
  45                                  const char* mapfile) {
  46   FILE* f;
  47   char line[XRAY_LINE_SIZE];
  48   bool in_text = false;
  49   bool in_link_once = false;
  50   int in_link_once_counter = 0;
  51   int num_symbols = 0;
  52
  53   printf("XRay: opening mapfile %s\n", mapfile);
  54   f = fopen(mapfile, "rt");
  55   if (0 == f) {
  56     fprintf(stderr, "XRay: failed to open %s\n", mapfile);
  57     return;
  58   }
  59   printf("XRay: parsing...\n");
  60   while (NULL != fgets(line, XRAY_LINE_SIZE, f)) {
  61     if (line == strstr(line, " .text ")) {
  62       in_text = true;
  63       continue;
  64     }
  65     if (line == strstr(line, " .gnu.linkonce.t.")) {
  66       in_link_once = true;
  67       in_link_once_counter = 0;
  68       continue;
  69     }
  70     if (line == strstr(line, " .text.")) {
  71       in_link_once = true;
  72       in_link_once_counter = 0;
  73       continue;
  74     }
  75     if (line == strstr(line, "                0x")) {
  76       if (in_text) {
  77         XRaySymbolTableCreateEntry(symtab, line);
  78         ++num_symbols;
  79       } else if (in_link_once) {
  80         if (in_link_once_counter != 0) {
  81           if (NULL != XRaySymbolTableCreateEntry(symtab, line))
  82             ++num_symbols;
  83         } else {
  84           ++in_link_once_counter;
  85         }
  86       }
  87     } else {
  88       in_text = false;
  89       in_link_once = false;
  90     }
  91   }
  92   fclose(f);
  93   printf("XRay: parsed %d symbols into symbol table\n", num_symbols);
  94 }
  95
  96 #endif  // XRAY