debug_mapinfo.cpp revision 72bbd423579bb971dc06cdd3c06201faf3fe95e6
1/* 2 * Copyright (C) 2012 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <stdio.h> 30#include <string.h> 31#include <stdlib.h> 32 33#ifdef USE_JEMALLOC 34#include "jemalloc.h" 35#define Malloc(function) je_ ## function 36#else 37#include "dlmalloc.h" 38#define Malloc(function) dl ## function 39#endif 40#include "debug_mapinfo.h" 41 42// 6f000000-6f01e000 rwxp 00000000 00:0c 16389419 /system/lib/libcomposer.so 43// 012345678901234567890123456789012345678901234567890123456789 44// 0 1 2 3 4 5 45 46static mapinfo_t* parse_maps_line(char* line) { 47 int len = strlen(line); 48 49 if (len < 1) return 0; 50 line[--len] = 0; 51 52 if (len < 50) return 0; 53 if (line[20] != 'x') return 0; 54 55 mapinfo_t* mi = static_cast<mapinfo_t*>(Malloc(malloc)(sizeof(mapinfo_t) + (len - 47))); 56 if (mi == 0) return 0; 57 58 mi->start = strtoul(line, 0, 16); 59 mi->end = strtoul(line + 9, 0, 16); 60 mi->next = 0; 61 strcpy(mi->name, line + 49); 62 63 return mi; 64} 65 66__LIBC_HIDDEN__ mapinfo_t* mapinfo_create(pid_t pid) { 67 struct mapinfo_t* milist = NULL; 68 char data[1024]; // Used to read lines as well as to construct the filename. 69 snprintf(data, sizeof(data), "/proc/%d/maps", pid); 70 FILE* fp = fopen(data, "r"); 71 if (fp != NULL) { 72 while (fgets(data, sizeof(data), fp) != NULL) { 73 mapinfo_t* mi = parse_maps_line(data); 74 if (mi) { 75 mi->next = milist; 76 milist = mi; 77 } 78 } 79 fclose(fp); 80 } 81 return milist; 82} 83 84__LIBC_HIDDEN__ void mapinfo_destroy(mapinfo_t* mi) { 85 while (mi != NULL) { 86 mapinfo_t* del = mi; 87 mi = mi->next; 88 Malloc(free)(del); 89 } 90} 91 92// Find the containing map info for the PC. 93__LIBC_HIDDEN__ const mapinfo_t* mapinfo_find(mapinfo_t* mi, uintptr_t pc, uintptr_t* rel_pc) { 94 for (; mi != NULL; mi = mi->next) { 95 if ((pc >= mi->start) && (pc < mi->end)) { 96 *rel_pc = pc - mi->start; 97 return mi; 98 } 99 } 100 *rel_pc = pc; 101 return NULL; 102} 103