Mercurial > hg > truffle
annotate src/os/bsd/vm/decoder_machO.cpp @ 6842:b9a9ed0f8eeb
7197424: update copyright year to match last edit in jdk8 hotspot repository
Summary: Update copyright year to 2012 for relevant files
Reviewed-by: dholmes, coleenp
| author | mikael |
|---|---|
| date | Tue, 09 Oct 2012 10:09:34 -0700 |
| parents | 3b01d0321dfa |
| children | 78bbf4d43a14 |
| rev | line source |
|---|---|
| 4803 | 1 /* |
|
6842
b9a9ed0f8eeb
7197424: update copyright year to match last edit in jdk8 hotspot repository
mikael
parents:
6258
diff
changeset
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2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. |
| 4803 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "precompiled.hpp" | |
| 26 | |
| 27 #ifdef __APPLE__ | |
| 28 #include "decoder_machO.hpp" | |
| 6258 | 29 |
| 30 #include <cxxabi.h> | |
| 31 #include <mach-o/loader.h> | |
| 32 #include <mach-o/nlist.h> | |
| 33 | |
| 34 | |
| 35 bool MachODecoder::demangle(const char* symbol, char *buf, int buflen) { | |
| 36 int status; | |
| 37 char* result; | |
| 38 size_t size = (size_t)buflen; | |
| 39 // Don't pass buf to __cxa_demangle. In case of the 'buf' is too small, | |
| 40 // __cxa_demangle will call system "realloc" for additional memory, which | |
| 41 // may use different malloc/realloc mechanism that allocates 'buf'. | |
| 42 if ((result = abi::__cxa_demangle(symbol, NULL, NULL, &status)) != NULL) { | |
| 43 jio_snprintf(buf, buflen, "%s", result); | |
| 44 // call c library's free | |
| 45 ::free(result); | |
| 46 return true; | |
| 47 } | |
| 48 return false; | |
| 49 } | |
| 50 | |
| 51 bool MachODecoder::decode(address addr, char *buf, | |
| 52 int buflen, int *offset, const void *mach_base) { | |
| 53 struct symtab_command * symt = (struct symtab_command *) | |
| 54 mach_find_command((struct mach_header_64 *)mach_base, LC_SYMTAB); | |
| 55 if (symt == NULL) { | |
| 56 DEBUG_ONLY(tty->print_cr("no symtab in mach file at 0x%lx", mach_base)); | |
| 57 return false; | |
| 58 } | |
| 59 uint32_t off = symt->symoff; /* symbol table offset (within this mach file) */ | |
| 60 uint32_t nsyms = symt->nsyms; /* number of symbol table entries */ | |
| 61 uint32_t stroff = symt->stroff; /* string table offset */ | |
| 62 uint32_t strsize = symt->strsize; /* string table size in bytes */ | |
| 63 | |
| 64 // iterate through symbol table trying to match our offset | |
| 65 | |
| 66 uint32_t addr_relative = (uintptr_t) mach_base - (uintptr_t) addr; // offset we seek in the symtab | |
| 67 void * symtab_addr = (void*) ((uintptr_t) mach_base + off); | |
| 68 struct nlist_64 *cur_nlist = (struct nlist_64 *) symtab_addr; | |
| 69 struct nlist_64 *last_nlist = cur_nlist; // no size stored in an entry, so keep previously seen nlist | |
| 70 | |
| 71 int32_t found_strx = 0; | |
| 72 int32_t found_symval = 0; | |
| 73 | |
| 74 for (uint32_t i=0; i < nsyms; i++) { | |
| 75 uint32_t this_value = cur_nlist->n_value; | |
| 76 | |
| 77 if (addr_relative == this_value) { | |
| 78 found_strx = cur_nlist->n_un.n_strx; | |
| 79 found_symval = this_value; | |
| 80 break; | |
| 81 } else if (addr_relative > this_value) { | |
| 82 // gone past it, use previously seen nlist: | |
| 83 found_strx = last_nlist->n_un.n_strx; | |
| 84 found_symval = last_nlist->n_value; | |
| 85 break; | |
| 86 } | |
| 87 last_nlist = cur_nlist; | |
| 88 cur_nlist = cur_nlist + sizeof(struct nlist_64); | |
| 89 } | |
| 90 if (found_strx == 0) { | |
| 91 return false; | |
| 92 } | |
| 93 // write the offset: | |
| 94 *offset = addr_relative - found_symval; | |
| 95 | |
| 96 // lookup found_strx in the string table | |
| 97 char * symname = mach_find_in_stringtable((char*) ((uintptr_t)mach_base + stroff), strsize, found_strx); | |
| 98 if (symname) { | |
| 99 strncpy(buf, symname, buflen); | |
| 100 return true; | |
| 101 } | |
| 102 DEBUG_ONLY(tty->print_cr("no string or null string found.")); | |
| 103 return false; | |
| 104 } | |
| 105 | |
| 106 void* MachODecoder::mach_find_command(struct mach_header_64 * mach_base, uint32_t command_wanted) { | |
| 107 // possibly verify it is a mach_header, use magic number. | |
| 108 // commands begin immediately after the header. | |
| 109 struct load_command *pos = (struct load_command *) mach_base + sizeof(struct mach_header_64); | |
| 110 for (uint32_t i = 0; i < mach_base->ncmds; i++) { | |
| 111 struct load_command *this_cmd = (struct load_command *) pos; | |
| 112 if (this_cmd->cmd == command_wanted) { | |
| 113 return pos; | |
| 114 } | |
| 115 int cmdsize = this_cmd->cmdsize; | |
| 116 pos += cmdsize; | |
| 117 } | |
| 118 return NULL; | |
| 119 } | |
| 120 | |
| 121 char* MachODecoder::mach_find_in_stringtable(char *strtab, uint32_t tablesize, int strx_wanted) { | |
| 122 | |
| 123 if (strx_wanted == 0) { | |
| 124 return NULL; | |
| 125 } | |
| 126 char *strtab_end = strtab + tablesize; | |
| 127 | |
| 128 // find the first string, skip over the space char | |
| 129 // (or the four zero bytes we see e.g. in libclient) | |
| 130 if (*strtab == ' ') { | |
| 131 strtab++; | |
| 132 if (*strtab != 0) { | |
| 133 DEBUG_ONLY(tty->print_cr("string table has leading space but no following zero.")); | |
| 134 return NULL; | |
| 135 } | |
| 136 strtab++; | |
| 137 } else { | |
| 138 if ((uint32_t) *strtab != 0) { | |
| 139 DEBUG_ONLY(tty->print_cr("string table without leading space or leading int of zero.")); | |
| 140 return NULL; | |
| 141 } | |
| 142 strtab+=4; | |
| 143 } | |
| 144 // read the real strings starting at index 1 | |
| 145 int cur_strx = 1; | |
| 146 while (strtab < strtab_end) { | |
| 147 if (cur_strx == strx_wanted) { | |
| 148 return strtab; | |
| 149 } | |
| 150 // find start of next string | |
| 151 while (*strtab != 0) { | |
| 152 strtab++; | |
| 153 } | |
| 154 strtab++; // skip the terminating zero | |
| 155 cur_strx++; | |
| 156 } | |
| 157 DEBUG_ONLY(tty->print_cr("string number %d not found.", strx_wanted)); | |
| 158 return NULL; | |
| 159 } | |
| 160 | |
| 161 | |
| 4803 | 162 #endif |
| 163 | |
| 164 |