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| 1 # Copyright (c) 2011 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 # Definitions of symbols that may be needed at runtime but aren't necessarily | |
| 6 # present in the SDK chosen for compilation. | |
| 7 # | |
| 8 # This file provides symbols for _NSConcreteGlobalBlock and | |
| 9 # _NSConcreteStackBlock, normally present in libSystem.dylib and provided by | |
| 10 # by libclosure-38/data.c in Mac OS X 10.6 and later. It also provides symbols | |
| 11 # for various block runtime functions provided by libclosure-38/runtime.c. | |
| 12 # When using the 10.5 SDK, the symbols are not present. This file's definition | |
| 13 # can be used with extreme care in an application that needs to use the 10.5 | |
| 14 # SDK in conjunction with blocks. | |
| 15 # | |
| 16 # This file cooperates with the build system to produce a dynamic library | |
| 17 # that, when linked against, causes dependents to look in libSystem for the | |
| 18 # symbols provided here. It also cooperates with a header that causes | |
| 19 # dependents to treat the symbols provided here as weak imports, critical for | |
| 20 # the resultant output to be loadable on 10.5. | |
| 21 | |
| 22 # To simplify things, this file assumes it's being built with the 10.5 SDK, | |
| 23 # a deployment target of 10.5, and is producing 32-bit x86 code. Other | |
| 24 # combinations are possible, but not interesting for the time being. See | |
| 25 # <sys/cdefs.h> for interesting ways that names might be mangled in other | |
| 26 # configurations. | |
| 27 | |
| 28 #include <AvailabilityMacros.h> | |
| 29 | |
| 30 #if MAC_OS_X_VERSION_MIN_REQUIRED != MAC_OS_X_VERSION_10_5 || \ | |
| 31 MAC_OS_X_VERSION_MAX_ALLOWED != MAC_OS_X_VERSION_10_5 || \ | |
| 32 !defined(__i386__) | |
| 33 #error This file only supports 32-bit x86 code with both SDK and DT set to 10.5 | |
| 34 #endif | |
| 35 | |
| 36 #define DEFINE_GLOBAL_SYMBOL(name) \ | |
| 37 .globl name ## ;\ | |
| 38 name ## : | |
| 39 | |
| 40 .text | |
| 41 | |
| 42 # Mac OS X 10.6.8 libclosure-38/runtime.c | |
| 43 | |
| 44 DEFINE_GLOBAL_SYMBOL(__Block_copy) | |
| 45 DEFINE_GLOBAL_SYMBOL(__Block_release) | |
| 46 DEFINE_GLOBAL_SYMBOL(__Block_object_assign) | |
| 47 DEFINE_GLOBAL_SYMBOL(__Block_object_dispose) | |
| 48 | |
| 49 .section __DATA,__data | |
| 50 | |
| 51 # Mac OS X 10.6.8 libclosure-38/data.c | |
| 52 | |
| 53 DEFINE_GLOBAL_SYMBOL(__NSConcreteGlobalBlock) | |
| 54 DEFINE_GLOBAL_SYMBOL(__NSConcreteStackBlock) | |
| 55 | |
| 56 # When this file is in use, the linker is expected to link things against both | |
| 57 # this file and the real copy of libSystem present in the SDK. When doing so, | |
| 58 # the linker is smart enough to produce only one LC_LOAD_DYLIB load command. | |
| 59 # However, it's not smart enough to notice that while this file's dylib only | |
| 60 # provides weak-imported symbols, the real libSystem's dylib does not. | |
| 61 # Consequently, it may produce an LC_LOAD_WEAK_DYLIB load command for | |
| 62 # libSystem instead of an ordinary LC_LOAD_DYLIB command. LC_LOAD_WEAK_DYLIB | |
| 63 # declares that any symbol offered by the library, and in fact the entire | |
| 64 # library, is permitted to be missing at runtime. This is entirely | |
| 65 # inappropriate for libSystem. To counteract this problem, this file also | |
| 66 # defines some other symbols that libSystem provides. Dependents of this | |
| 67 # library are not expected to treat these other symbols as weak imports. In | |
| 68 # order for any dependent that links against this library to load it with an | |
| 69 # LC_LOAD_DYLIB command instead of an LC_LOAD_WEAK_DYLIB command, this library | |
| 70 # must satisfy at least one unresolved non-weak-import symbol required by the | |
| 71 # dependent. | |
| 72 | |
| 73 .text | |
| 74 | |
| 75 # |exit| is a good one: because it's referenced by crt1.o, ordinary executables | |
| 76 # are guaranteed to need this symbol. Unfortunately, there's no such symbol in | |
| 77 # dylib1.o that libSystem is expected to provide, so a few other common libc | |
| 78 # symbols are thrown into the mix. | |
| 79 DEFINE_GLOBAL_SYMBOL(_exit) | |
| 80 | |
| 81 # Include |close| because well-written programs that use the standard library | |
| 82 # are likely to refer to it. Include |open| for good measure because it goes | |
| 83 # pretty well with this. Include the stdio abstractions for these functions | |
| 84 # as well. | |
| 85 DEFINE_GLOBAL_SYMBOL(_close$UNIX2003) | |
| 86 DEFINE_GLOBAL_SYMBOL(_open$UNIX2003) | |
| 87 DEFINE_GLOBAL_SYMBOL(_fclose) | |
| 88 DEFINE_GLOBAL_SYMBOL(_fopen) | |
| 89 DEFINE_GLOBAL_SYMBOL(_fdopen) | |
| 90 DEFINE_GLOBAL_SYMBOL(_freopen$UNIX2003) | |
| 91 | |
| 92 # Commonly-used allocation functions. | |
| 93 DEFINE_GLOBAL_SYMBOL(_malloc) | |
| 94 DEFINE_GLOBAL_SYMBOL(_calloc) | |
| 95 DEFINE_GLOBAL_SYMBOL(_realloc) | |
| 96 DEFINE_GLOBAL_SYMBOL(_reallocf) | |
| 97 DEFINE_GLOBAL_SYMBOL(_valloc) | |
| 98 DEFINE_GLOBAL_SYMBOL(_free) | |
| 99 | |
| 100 # Include |printf|, |fprintf|, |sprintf|, |snprintf|, and |puts|, because | |
| 101 # small test programs are likely to refer to one of these. puts is rarely | |
| 102 # invoked directly, but the compiler may optimize simple printf calls into | |
| 103 # puts calls. | |
| 104 DEFINE_GLOBAL_SYMBOL(_printf) | |
| 105 DEFINE_GLOBAL_SYMBOL(_fprintf) | |
| 106 DEFINE_GLOBAL_SYMBOL(_sprintf) | |
| 107 DEFINE_GLOBAL_SYMBOL(_snprintf) | |
| 108 DEFINE_GLOBAL_SYMBOL(_puts) | |
| 109 | |
| 110 # Some <string.h> functions that are commonly used. | |
| 111 DEFINE_GLOBAL_SYMBOL(_memcmp) | |
| 112 DEFINE_GLOBAL_SYMBOL(_memcpy) | |
| 113 DEFINE_GLOBAL_SYMBOL(_memmove) | |
| 114 DEFINE_GLOBAL_SYMBOL(_memset) | |
| 115 DEFINE_GLOBAL_SYMBOL(_strcasecmp) | |
| 116 DEFINE_GLOBAL_SYMBOL(_strcat) | |
| 117 DEFINE_GLOBAL_SYMBOL(_strchr) | |
| 118 DEFINE_GLOBAL_SYMBOL(_strcmp) | |
| 119 DEFINE_GLOBAL_SYMBOL(_strcpy) | |
| 120 DEFINE_GLOBAL_SYMBOL(_strdup) | |
| 121 DEFINE_GLOBAL_SYMBOL(_strlcat) | |
| 122 DEFINE_GLOBAL_SYMBOL(_strlcpy) | |
| 123 DEFINE_GLOBAL_SYMBOL(_strlen) | |
| 124 DEFINE_GLOBAL_SYMBOL(_strncasecmp) | |
| 125 DEFINE_GLOBAL_SYMBOL(_strncat) | |
| 126 DEFINE_GLOBAL_SYMBOL(_strncmp) | |
| 127 DEFINE_GLOBAL_SYMBOL(_strncpy) | |
| 128 DEFINE_GLOBAL_SYMBOL(_strnstr) | |
| 129 DEFINE_GLOBAL_SYMBOL(_strstr) | |
| 130 | |
| 131 # Some data-section symbols that might be referenced. | |
| 132 | |
| 133 .section __DATA,__data | |
| 134 | |
| 135 DEFINE_GLOBAL_SYMBOL(___stdinp) | |
| 136 DEFINE_GLOBAL_SYMBOL(___stdoutp) | |
| 137 DEFINE_GLOBAL_SYMBOL(___stderrp) | |
| 138 | |
| 139 #undef DEFINE_GLOBAL_SYMBOL | |
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Chromium Code Reviews
Issue 8060022:
Move Leopard compatible block code to content/. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src