From owner-svn-src-all@FreeBSD.ORG Sun Jul 17 15:40:57 2011 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 26083106564A; Sun, 17 Jul 2011 15:40:57 +0000 (UTC) (envelope-from dim@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c]) by mx1.freebsd.org (Postfix) with ESMTP id 122E68FC21; Sun, 17 Jul 2011 15:40:57 +0000 (UTC) Received: from svn.freebsd.org (localhost [127.0.0.1]) by svn.freebsd.org (8.14.4/8.14.4) with ESMTP id p6HFevrq079364; Sun, 17 Jul 2011 15:40:57 GMT (envelope-from dim@svn.freebsd.org) Received: (from dim@localhost) by svn.freebsd.org (8.14.4/8.14.4/Submit) id p6HFeuLs079350; Sun, 17 Jul 2011 15:40:56 GMT (envelope-from dim@svn.freebsd.org) Message-Id: <201107171540.p6HFeuLs079350@svn.freebsd.org> From: Dimitry Andric Date: Sun, 17 Jul 2011 15:40:56 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-vendor@freebsd.org X-SVN-Group: vendor MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Subject: svn commit: r224135 - in vendor/clang/dist: . INPUTS bindings/python/clang bindings/python/tests/cindex clang.xcodeproj docs examples/Tooling include/clang-c include/clang/ARCMigrate include/clang/... X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 17 Jul 2011 15:40:57 -0000 Author: dim Date: Sun Jul 17 15:40:56 2011 New Revision: 224135 URL: http://svn.freebsd.org/changeset/base/224135 Log: Vendor import of clang trunk r135360: http://llvm.org/svn/llvm-project/cfe/trunk@135360 Added: vendor/clang/dist/INPUTS/cfg-big-switch.c vendor/clang/dist/INPUTS/cfg-long-chain1.c vendor/clang/dist/INPUTS/cfg-long-chain2.c vendor/clang/dist/INPUTS/cfg-long-chain3.c vendor/clang/dist/INPUTS/cfg-nested-switches.c vendor/clang/dist/docs/AutomaticReferenceCounting.html vendor/clang/dist/include/clang/ARCMigrate/ vendor/clang/dist/include/clang/ARCMigrate/ARCMT.h vendor/clang/dist/include/clang/ARCMigrate/ARCMTActions.h vendor/clang/dist/include/clang/ARCMigrate/FileRemapper.h vendor/clang/dist/include/clang/AST/GlobalDecl.h vendor/clang/dist/include/clang/Basic/DelayedCleanupPool.h vendor/clang/dist/include/clang/Basic/DiagnosticCategories.h vendor/clang/dist/include/clang/Driver/ObjCRuntime.h vendor/clang/dist/include/clang/Sema/LocInfoType.h vendor/clang/dist/include/clang/Sema/TypoCorrection.h vendor/clang/dist/lib/ARCMigrate/ vendor/clang/dist/lib/ARCMigrate/ARCMT.cpp vendor/clang/dist/lib/ARCMigrate/ARCMTActions.cpp vendor/clang/dist/lib/ARCMigrate/CMakeLists.txt vendor/clang/dist/lib/ARCMigrate/FileRemapper.cpp vendor/clang/dist/lib/ARCMigrate/Internals.h vendor/clang/dist/lib/ARCMigrate/Makefile vendor/clang/dist/lib/ARCMigrate/TransARCAssign.cpp vendor/clang/dist/lib/ARCMigrate/TransAutoreleasePool.cpp vendor/clang/dist/lib/ARCMigrate/TransBlockObjCVariable.cpp vendor/clang/dist/lib/ARCMigrate/TransEmptyStatementsAndDealloc.cpp vendor/clang/dist/lib/ARCMigrate/TransProperties.cpp vendor/clang/dist/lib/ARCMigrate/TransRetainReleaseDealloc.cpp 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vendor/clang/dist/test/Sema/sign-conversion.c vendor/clang/dist/test/Sema/warn-sizeof-arrayarg.c vendor/clang/dist/test/SemaCXX/PR10243.cpp vendor/clang/dist/test/SemaCXX/PR7410.cpp vendor/clang/dist/test/SemaCXX/for-range-unused.cpp vendor/clang/dist/test/SemaCXX/function-overload-typo-crash.cpp vendor/clang/dist/test/SemaCXX/missing-namespace-qualifier-typo-corrections.cpp vendor/clang/dist/test/SemaCXX/null_in_arithmetic_ops.cpp vendor/clang/dist/test/SemaCXX/nullptr_in_arithmetic_ops.cpp vendor/clang/dist/test/SemaCXX/warn-memset-bad-sizeof.cpp vendor/clang/dist/test/SemaObjC/Inputs/ vendor/clang/dist/test/SemaObjC/Inputs/arc-system-header.h vendor/clang/dist/test/SemaObjC/arc-bridged-cast.m vendor/clang/dist/test/SemaObjC/arc-decls.m vendor/clang/dist/test/SemaObjC/arc-jump-block.m vendor/clang/dist/test/SemaObjC/arc-no-runtime.m vendor/clang/dist/test/SemaObjC/arc-non-pod-memaccess.m vendor/clang/dist/test/SemaObjC/arc-peformselector.m 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vendor/clang/dist/test/SemaTemplate/unresolved-construct.cpp vendor/clang/dist/tools/arcmt-test/ vendor/clang/dist/tools/arcmt-test/CMakeLists.txt vendor/clang/dist/tools/arcmt-test/Makefile vendor/clang/dist/tools/arcmt-test/arcmt-test.cpp vendor/clang/dist/tools/c-arcmt-test/ vendor/clang/dist/tools/c-arcmt-test/CMakeLists.txt vendor/clang/dist/tools/c-arcmt-test/Makefile vendor/clang/dist/tools/c-arcmt-test/c-arcmt-test.c vendor/clang/dist/tools/libclang/ARCMigrate.cpp Deleted: vendor/clang/dist/docs/index.html vendor/clang/dist/examples/Tooling/ vendor/clang/dist/include/clang/Tooling/ vendor/clang/dist/lib/CodeGen/GlobalDecl.h vendor/clang/dist/lib/Frontend/BoostConAction.cpp vendor/clang/dist/lib/Tooling/ vendor/clang/dist/test/CodeGen/call-knr-indirect.c vendor/clang/dist/test/CodeGenObjC/debug-info-foreach.m vendor/clang/dist/unittests/Tooling/ Modified: vendor/clang/dist/CMakeLists.txt vendor/clang/dist/LICENSE.TXT vendor/clang/dist/bindings/python/clang/cindex.py 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vendor/clang/dist/test/SemaTemplate/ext-vector-type.cpp vendor/clang/dist/test/SemaTemplate/instantiate-call.cpp vendor/clang/dist/test/SemaTemplate/instantiate-function-2.cpp vendor/clang/dist/test/SemaTemplate/instantiate-member-class.cpp vendor/clang/dist/test/SemaTemplate/instantiate-try-catch.cpp vendor/clang/dist/test/Unit/lit.cfg vendor/clang/dist/tools/CMakeLists.txt vendor/clang/dist/tools/Makefile vendor/clang/dist/tools/c-index-test/Makefile vendor/clang/dist/tools/c-index-test/c-index-test.c vendor/clang/dist/tools/driver/CMakeLists.txt vendor/clang/dist/tools/driver/Makefile vendor/clang/dist/tools/driver/cc1_main.cpp vendor/clang/dist/tools/driver/cc1as_main.cpp vendor/clang/dist/tools/driver/driver.cpp vendor/clang/dist/tools/libclang/CIndex.cpp vendor/clang/dist/tools/libclang/CIndexCodeCompletion.cpp vendor/clang/dist/tools/libclang/CMakeLists.txt vendor/clang/dist/tools/libclang/CXCursor.cpp vendor/clang/dist/tools/libclang/CXCursor.h vendor/clang/dist/tools/libclang/CXType.cpp vendor/clang/dist/tools/libclang/Makefile vendor/clang/dist/tools/libclang/libclang.darwin.exports vendor/clang/dist/tools/libclang/libclang.exports vendor/clang/dist/tools/scan-build/ccc-analyzer vendor/clang/dist/unittests/Basic/FileManagerTest.cpp vendor/clang/dist/unittests/Frontend/Makefile vendor/clang/dist/www/compatibility.html Modified: vendor/clang/dist/CMakeLists.txt ============================================================================== --- vendor/clang/dist/CMakeLists.txt Sun Jul 17 15:38:20 2011 (r224134) +++ vendor/clang/dist/CMakeLists.txt Sun Jul 17 15:40:56 2011 (r224135) @@ -20,7 +20,11 @@ if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURR endif() if( NOT EXISTS "${CLANG_PATH_TO_LLVM_BUILD}/bin/tblgen${CMAKE_EXECUTABLE_SUFFIX}" ) - message(FATAL_ERROR "Please set CLANG_PATH_TO_LLVM_BUILD to a directory containing a LLVM build.") + # Looking for bin/Debug/tblgen is a complete hack. How can we get + # around this? + if( NOT EXISTS "${CLANG_PATH_TO_LLVM_BUILD}/bin/Debug/tblgen${CMAKE_EXECUTABLE_SUFFIX}" ) + message(FATAL_ERROR "Please set CLANG_PATH_TO_LLVM_BUILD to a directory containing a LLVM build.") + endif() endif() list(APPEND CMAKE_MODULE_PATH "${CLANG_PATH_TO_LLVM_BUILD}/share/llvm/cmake") @@ -42,7 +46,12 @@ if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURR include_directories("${PATH_TO_LLVM_BUILD}/include" "${LLVM_MAIN_INCLUDE_DIR}") link_directories("${PATH_TO_LLVM_BUILD}/lib") - set(LLVM_TABLEGEN_EXE "${PATH_TO_LLVM_BUILD}/bin/tblgen") + if( EXISTS "${CLANG_PATH_TO_LLVM_BUILD}/bin/tblgen${CMAKE_EXECUTABLE_SUFFIX}" ) + set(LLVM_TABLEGEN_EXE "${PATH_TO_LLVM_BUILD}/bin/tblgen") + else() + # FIXME: This is an utter hack. + set(LLVM_TABLEGEN_EXE "${PATH_TO_LLVM_BUILD}/bin/Debug/tblgen") + endif() set( CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin ) set( CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib ) Added: vendor/clang/dist/INPUTS/cfg-big-switch.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ vendor/clang/dist/INPUTS/cfg-big-switch.c Sun Jul 17 15:40:56 2011 (r224135) @@ -0,0 +1,27 @@ +#define EXPAND_2_CASES(i, x, y) CASE(i, x, y); CASE(i + 1, x, y); +#define EXPAND_4_CASES(i, x, y) EXPAND_2_CASES(i, x, y) EXPAND_2_CASES(i + 2, x, y) +#define EXPAND_8_CASES(i, x, y) EXPAND_4_CASES(i, x, y) EXPAND_4_CASES(i + 4, x, y) +#define EXPAND_16_CASES(i, x, y) EXPAND_8_CASES(i, x, y) EXPAND_8_CASES(i + 8, x, y) +#define EXPAND_32_CASES(i, x, y) EXPAND_16_CASES(i, x, y) EXPAND_16_CASES(i + 16, x, y) +#define EXPAND_64_CASES(i, x, y) EXPAND_32_CASES(i, x, y) EXPAND_32_CASES(i + 32, x, y) +#define EXPAND_128_CASES(i, x, y) EXPAND_64_CASES(i, x, y) EXPAND_64_CASES(i + 64, x, y) +#define EXPAND_256_CASES(i, x, y) EXPAND_128_CASES(i, x, y) EXPAND_128_CASES(i + 128, x, y) +#define EXPAND_512_CASES(i, x, y) EXPAND_256_CASES(i, x, y) EXPAND_256_CASES(i + 256, x, y) +#define EXPAND_1024_CASES(i, x, y) EXPAND_512_CASES(i, x, y) EXPAND_512_CASES(i + 512, x, y) +#define EXPAND_2048_CASES(i, x, y) EXPAND_1024_CASES(i, x, y) EXPAND_1024_CASES(i + 1024, x, y) +#define EXPAND_4096_CASES(i, x, y) EXPAND_2048_CASES(i, x, y) EXPAND_2048_CASES(i + 2048, x, y) + +// This has a *monstrous* single fan-out in the CFG, across 8000 blocks inside +// the while loop. +unsigned cfg_big_switch(int x) { + unsigned y = 0; + while (x > 0) { + switch(x) { +#define CASE(i, x, y) \ + case i: { int case_var = 3*x + i; y += case_var - 1; break; } +EXPAND_4096_CASES(0, x, y); + } + --x; + } + return y; +} Added: vendor/clang/dist/INPUTS/cfg-long-chain1.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ vendor/clang/dist/INPUTS/cfg-long-chain1.c Sun Jul 17 15:40:56 2011 (r224135) @@ -0,0 +1,20 @@ +#define EXPAND_2_BRANCHES(i, x, y) BRANCH(i, x, y); BRANCH(i + 1, x, y); +#define EXPAND_4_BRANCHES(i, x, y) EXPAND_2_BRANCHES(i, x, y) EXPAND_2_BRANCHES(i + 2, x, y) +#define EXPAND_8_BRANCHES(i, x, y) EXPAND_4_BRANCHES(i, x, y) EXPAND_4_BRANCHES(i + 4, x, y) +#define EXPAND_16_BRANCHES(i, x, y) EXPAND_8_BRANCHES(i, x, y) EXPAND_8_BRANCHES(i + 8, x, y) +#define EXPAND_32_BRANCHES(i, x, y) EXPAND_16_BRANCHES(i, x, y) EXPAND_16_BRANCHES(i + 16, x, y) +#define EXPAND_64_BRANCHES(i, x, y) EXPAND_32_BRANCHES(i, x, y) EXPAND_32_BRANCHES(i + 32, x, y) +#define EXPAND_128_BRANCHES(i, x, y) EXPAND_64_BRANCHES(i, x, y) EXPAND_64_BRANCHES(i + 64, x, y) +#define EXPAND_256_BRANCHES(i, x, y) EXPAND_128_BRANCHES(i, x, y) EXPAND_128_BRANCHES(i + 128, x, y) +#define EXPAND_512_BRANCHES(i, x, y) EXPAND_256_BRANCHES(i, x, y) EXPAND_256_BRANCHES(i + 256, x, y) +#define EXPAND_1024_BRANCHES(i, x, y) EXPAND_512_BRANCHES(i, x, y) EXPAND_512_BRANCHES(i + 512, x, y) +#define EXPAND_2048_BRANCHES(i, x, y) EXPAND_1024_BRANCHES(i, x, y) EXPAND_1024_BRANCHES(i + 1024, x, y) +#define EXPAND_4096_BRANCHES(i, x, y) EXPAND_2048_BRANCHES(i, x, y) EXPAND_2048_BRANCHES(i + 2048, x, y) + +unsigned cfg_long_chain_single_exit(unsigned x) { + unsigned y = 0; +#define BRANCH(i, x, y) if ((x % 13171) < i) { int var = x / 13171; y ^= var; } + EXPAND_4096_BRANCHES(1, x, y); +#undef BRANCH + return y; +} Added: vendor/clang/dist/INPUTS/cfg-long-chain2.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ vendor/clang/dist/INPUTS/cfg-long-chain2.c Sun Jul 17 15:40:56 2011 (r224135) @@ -0,0 +1,20 @@ +#define EXPAND_2_BRANCHES(i, x, y) BRANCH(i, x, y); BRANCH(i + 1, x, y); +#define EXPAND_4_BRANCHES(i, x, y) EXPAND_2_BRANCHES(i, x, y) EXPAND_2_BRANCHES(i + 2, x, y) +#define EXPAND_8_BRANCHES(i, x, y) EXPAND_4_BRANCHES(i, x, y) EXPAND_4_BRANCHES(i + 4, x, y) +#define EXPAND_16_BRANCHES(i, x, y) EXPAND_8_BRANCHES(i, x, y) EXPAND_8_BRANCHES(i + 8, x, y) +#define EXPAND_32_BRANCHES(i, x, y) EXPAND_16_BRANCHES(i, x, y) EXPAND_16_BRANCHES(i + 16, x, y) +#define EXPAND_64_BRANCHES(i, x, y) EXPAND_32_BRANCHES(i, x, y) EXPAND_32_BRANCHES(i + 32, x, y) +#define EXPAND_128_BRANCHES(i, x, y) EXPAND_64_BRANCHES(i, x, y) EXPAND_64_BRANCHES(i + 64, x, y) +#define EXPAND_256_BRANCHES(i, x, y) EXPAND_128_BRANCHES(i, x, y) EXPAND_128_BRANCHES(i + 128, x, y) +#define EXPAND_512_BRANCHES(i, x, y) EXPAND_256_BRANCHES(i, x, y) EXPAND_256_BRANCHES(i + 256, x, y) +#define EXPAND_1024_BRANCHES(i, x, y) EXPAND_512_BRANCHES(i, x, y) EXPAND_512_BRANCHES(i + 512, x, y) +#define EXPAND_2048_BRANCHES(i, x, y) EXPAND_1024_BRANCHES(i, x, y) EXPAND_1024_BRANCHES(i + 1024, x, y) +#define EXPAND_4096_BRANCHES(i, x, y) EXPAND_2048_BRANCHES(i, x, y) EXPAND_2048_BRANCHES(i + 2048, x, y) + +unsigned cfg_long_chain_multiple_exit(unsigned x) { + unsigned y = 0; +#define BRANCH(i, x, y) if (((x % 13171) + ++y) < i) { int var = x / 13171 + y; return var; } + EXPAND_4096_BRANCHES(1, x, y); +#undef BRANCH + return 42; +} Added: vendor/clang/dist/INPUTS/cfg-long-chain3.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ vendor/clang/dist/INPUTS/cfg-long-chain3.c Sun Jul 17 15:40:56 2011 (r224135) @@ -0,0 +1,21 @@ +#define EXPAND_2_BRANCHES(i, x, y) BRANCH(i, x, y); BRANCH(i + 1, x, y); +#define EXPAND_4_BRANCHES(i, x, y) EXPAND_2_BRANCHES(i, x, y) EXPAND_2_BRANCHES(i + 2, x, y) +#define EXPAND_8_BRANCHES(i, x, y) EXPAND_4_BRANCHES(i, x, y) EXPAND_4_BRANCHES(i + 4, x, y) +#define EXPAND_16_BRANCHES(i, x, y) EXPAND_8_BRANCHES(i, x, y) EXPAND_8_BRANCHES(i + 8, x, y) +#define EXPAND_32_BRANCHES(i, x, y) EXPAND_16_BRANCHES(i, x, y) EXPAND_16_BRANCHES(i + 16, x, y) +#define EXPAND_64_BRANCHES(i, x, y) EXPAND_32_BRANCHES(i, x, y) EXPAND_32_BRANCHES(i + 32, x, y) +#define EXPAND_128_BRANCHES(i, x, y) EXPAND_64_BRANCHES(i, x, y) EXPAND_64_BRANCHES(i + 64, x, y) +#define EXPAND_256_BRANCHES(i, x, y) EXPAND_128_BRANCHES(i, x, y) EXPAND_128_BRANCHES(i + 128, x, y) +#define EXPAND_512_BRANCHES(i, x, y) EXPAND_256_BRANCHES(i, x, y) EXPAND_256_BRANCHES(i + 256, x, y) +#define EXPAND_1024_BRANCHES(i, x, y) EXPAND_512_BRANCHES(i, x, y) EXPAND_512_BRANCHES(i + 512, x, y) +#define EXPAND_2048_BRANCHES(i, x, y) EXPAND_1024_BRANCHES(i, x, y) EXPAND_1024_BRANCHES(i + 1024, x, y) +#define EXPAND_4096_BRANCHES(i, x, y) EXPAND_2048_BRANCHES(i, x, y) EXPAND_2048_BRANCHES(i + 2048, x, y) + +unsigned cfg_long_chain_many_preds(unsigned x) { + unsigned y = 0; +#define BRANCH(i, x, y) if ((x % 13171) < i) { int var = x / 13171; y ^= var; } else + EXPAND_4096_BRANCHES(1, x, y); +#undef BRANCH + int var = x / 13171; y^= var; + return y; +} Added: vendor/clang/dist/INPUTS/cfg-nested-switches.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ vendor/clang/dist/INPUTS/cfg-nested-switches.c Sun Jul 17 15:40:56 2011 (r224135) @@ -0,0 +1,36 @@ +#define EXPAND_2_INNER_CASES(i, x, y) INNER_CASE(i, x, y); INNER_CASE(i + 1, x, y); +#define EXPAND_4_INNER_CASES(i, x, y) EXPAND_2_INNER_CASES(i, x, y) EXPAND_2_INNER_CASES(i + 2, x, y) +#define EXPAND_8_INNER_CASES(i, x, y) EXPAND_4_INNER_CASES(i, x, y) EXPAND_4_INNER_CASES(i + 4, x, y) +#define EXPAND_16_INNER_CASES(i, x, y) EXPAND_8_INNER_CASES(i, x, y) EXPAND_8_INNER_CASES(i + 8, x, y) +#define EXPAND_32_INNER_CASES(i, x, y) EXPAND_16_INNER_CASES(i, x, y) EXPAND_16_INNER_CASES(i + 16, x, y) +#define EXPAND_64_INNER_CASES(i, x, y) EXPAND_32_INNER_CASES(i, x, y) EXPAND_32_INNER_CASES(i + 32, x, y) + +#define EXPAND_2_OUTER_CASES(i, x, y) OUTER_CASE(i, x, y); OUTER_CASE(i + 1, x, y); +#define EXPAND_4_OUTER_CASES(i, x, y) EXPAND_2_OUTER_CASES(i, x, y) EXPAND_2_OUTER_CASES(i + 2, x, y) +#define EXPAND_8_OUTER_CASES(i, x, y) EXPAND_4_OUTER_CASES(i, x, y) EXPAND_4_OUTER_CASES(i + 4, x, y) +#define EXPAND_16_OUTER_CASES(i, x, y) EXPAND_8_OUTER_CASES(i, x, y) EXPAND_8_OUTER_CASES(i + 8, x, y) +#define EXPAND_32_OUTER_CASES(i, x, y) EXPAND_16_OUTER_CASES(i, x, y) EXPAND_16_OUTER_CASES(i + 16, x, y) +#define EXPAND_64_OUTER_CASES(i, x, y) EXPAND_32_OUTER_CASES(i, x, y) EXPAND_32_OUTER_CASES(i + 32, x, y) + +// Rather than a single monstrous fan-out, this fans out in smaller increments, +// but to a similar size. +unsigned cfg_nested_switch(int x) { + unsigned y = 0; + while (x > 0) { + switch (x) { +#define INNER_CASE(i, x, y) \ + case i: { int case_var = 3*x + i; y += case_var - 1; break; } +#define OUTER_CASE(i, x, y) \ + case i: { \ + int case_var = y >> 8; \ + switch (case_var) { \ + EXPAND_64_INNER_CASES(0, x, y); \ + } \ + break; \ + } +EXPAND_64_OUTER_CASES(0, x, y); + } + --x; + } + return y; +} Modified: vendor/clang/dist/LICENSE.TXT ============================================================================== --- vendor/clang/dist/LICENSE.TXT Sun Jul 17 15:38:20 2011 (r224134) +++ vendor/clang/dist/LICENSE.TXT Sun Jul 17 15:40:56 2011 (r224135) @@ -4,7 +4,7 @@ LLVM Release License University of Illinois/NCSA Open Source License -Copyright (c) 2007-2010 University of Illinois at Urbana-Champaign. +Copyright (c) 2007-2011 University of Illinois at Urbana-Champaign. All rights reserved. Developed by: Modified: vendor/clang/dist/bindings/python/clang/cindex.py ============================================================================== --- vendor/clang/dist/bindings/python/clang/cindex.py Sun Jul 17 15:38:20 2011 (r224134) +++ vendor/clang/dist/bindings/python/clang/cindex.py Sun Jul 17 15:40:56 2011 (r224135) @@ -321,6 +321,10 @@ class CursorKind(object): """Test if this is a statement kind.""" return CursorKind_is_stmt(self) + def is_attribute(self): + """Test if this is an attribute kind.""" + return CursorKind_is_attribute(self) + def is_invalid(self): """Test if this is an invalid kind.""" return CursorKind_is_inv(self) @@ -978,8 +982,9 @@ class TranslationUnit(ClangObject): headers. """ def visitor(fobj, lptr, depth, includes): - loc = lptr.contents - includes.append(FileInclusion(loc.file, File(fobj), loc, depth)) + if depth > 0: + loc = lptr.contents + includes.append(FileInclusion(loc.file, File(fobj), loc, depth)) # Automatically adapt CIndex/ctype pointers to python objects includes = [] @@ -1074,7 +1079,7 @@ class File(ClangObject): @property def name(self): """Return the complete file and path name of the file.""" - return File_name(self) + return _CXString_getCString(File_name(self)) @property def time(self): @@ -1147,6 +1152,10 @@ CursorKind_is_stmt = lib.clang_isStateme CursorKind_is_stmt.argtypes = [CursorKind] CursorKind_is_stmt.restype = bool +CursorKind_is_attribute = lib.clang_isAttribute +CursorKind_is_attribute.argtypes = [CursorKind] +CursorKind_is_attribute.restype = bool + CursorKind_is_inv = lib.clang_isInvalid CursorKind_is_inv.argtypes = [CursorKind] CursorKind_is_inv.restype = bool @@ -1183,6 +1192,11 @@ Cursor_spelling.argtypes = [Cursor] Cursor_spelling.restype = _CXString Cursor_spelling.errcheck = _CXString.from_result +Cursor_displayname = lib.clang_getCursorDisplayName +Cursor_displayname.argtypes = [Cursor] +Cursor_displayname.restype = _CXString +Cursor_displayname.errcheck = _CXString.from_result + Cursor_loc = lib.clang_getCursorLocation Cursor_loc.argtypes = [Cursor] Cursor_loc.restype = SourceLocation @@ -1253,7 +1267,7 @@ TranslationUnit_includes.argtypes = [Tra # File Functions File_name = lib.clang_getFileName File_name.argtypes = [File] -File_name.restype = c_char_p +File_name.restype = _CXString File_time = lib.clang_getFileTime File_time.argtypes = [File] Modified: vendor/clang/dist/bindings/python/tests/cindex/test_cursor_kind.py ============================================================================== --- vendor/clang/dist/bindings/python/tests/cindex/test_cursor_kind.py Sun Jul 17 15:38:20 2011 (r224134) +++ vendor/clang/dist/bindings/python/tests/cindex/test_cursor_kind.py Sun Jul 17 15:40:56 2011 (r224135) @@ -18,10 +18,14 @@ def test_kind_groups(): for k in CursorKind.get_all_kinds(): group = [n for n in ('is_declaration', 'is_reference', 'is_expression', - 'is_statement', 'is_invalid') + 'is_statement', 'is_invalid', 'is_attribute') if getattr(k, n)()] - if k == CursorKind.TRANSLATION_UNIT: + if k in ( CursorKind.TRANSLATION_UNIT, + CursorKind.MACRO_DEFINITION, + CursorKind.MACRO_INSTANTIATION, + CursorKind.INCLUSION_DIRECTIVE, + CursorKind.PREPROCESSING_DIRECTIVE): assert len(group) == 0 else: assert len(group) == 1 Modified: vendor/clang/dist/bindings/python/tests/cindex/test_translation_unit.py ============================================================================== --- vendor/clang/dist/bindings/python/tests/cindex/test_translation_unit.py Sun Jul 17 15:38:20 2011 (r224134) +++ vendor/clang/dist/bindings/python/tests/cindex/test_translation_unit.py Sun Jul 17 15:40:56 2011 (r224135) @@ -58,24 +58,27 @@ def test_unsaved_files_2(): spellings = [c.spelling for c in tu.cursor.get_children()] assert spellings[-1] == 'x' +def normpaths_equal(path1, path2): + """ Compares two paths for equality after normalizing them with + os.path.normpath + """ + return os.path.normpath(path1) == os.path.normpath(path2) def test_includes(): def eq(expected, actual): if not actual.is_input_file: - return expected[0] == actual.source.name and \ - expected[1] == actual.include.name + return normpaths_equal(expected[0], actual.source.name) and \ + normpaths_equal(expected[1], actual.include.name) else: - return expected[1] == actual.include.name + return normpaths_equal(expected[1], actual.include.name) src = os.path.join(kInputsDir, 'include.cpp') h1 = os.path.join(kInputsDir, "header1.h") h2 = os.path.join(kInputsDir, "header2.h") h3 = os.path.join(kInputsDir, "header3.h") - inc = [(None, src), (src, h1), (h1, h3), (src, h2), (h2, h3)] + inc = [(src, h1), (h1, h3), (src, h2), (h2, h3)] index = Index.create() tu = index.parse(src) for i in zip(inc, tu.get_includes()): assert eq(i[0], i[1]) - - Modified: vendor/clang/dist/clang.xcodeproj/project.pbxproj ============================================================================== --- vendor/clang/dist/clang.xcodeproj/project.pbxproj Sun Jul 17 15:38:20 2011 (r224134) +++ vendor/clang/dist/clang.xcodeproj/project.pbxproj Sun Jul 17 15:40:56 2011 (r224135) @@ -373,6 +373,12 @@ 90FD6D90103C3D80005F5B73 /* TypeXML.def */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; name = TypeXML.def; path = clang/Frontend/TypeXML.def; sourceTree = ""; }; 90FD6D91103C3D80005F5B73 /* Utils.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = Utils.h; path = clang/Frontend/Utils.h; sourceTree = ""; }; 90FD6DB5103D977E005F5B73 /* index-test.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = "index-test.cpp"; path = "tools/index-test/index-test.cpp"; sourceTree = ""; }; + BB20603B131EDDBF003C3343 /* CMakeLists.txt */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = CMakeLists.txt; sourceTree = ""; }; + BB20603C131EDDBF003C3343 /* Makefile */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.make; path = Makefile; sourceTree = ""; }; + BB206041131EDDDA003C3343 /* ARRMT.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ARRMT.h; sourceTree = ""; }; + BB206043131EDE03003C3343 /* arrmt-test.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = "arrmt-test.cpp"; sourceTree = ""; }; + BB206044131EDE03003C3343 /* CMakeLists.txt */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = CMakeLists.txt; sourceTree = ""; }; + BB206045131EDE03003C3343 /* Makefile */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.make; path = Makefile; sourceTree = ""; }; BB5C372812A5057500259F53 /* DumpXML.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = DumpXML.cpp; path = /Volumes/Data/llvm/tools/clang/lib/AST/DumpXML.cpp; sourceTree = ""; }; BBA5AB141309C2FA000B38F1 /* AdjustedReturnValueChecker.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = AdjustedReturnValueChecker.cpp; sourceTree = ""; }; BBA5AB151309C2FA000B38F1 /* AnalyzerStatsChecker.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = AnalyzerStatsChecker.cpp; sourceTree = ""; }; @@ -561,7 +567,6 @@ BF9FEE321225E898003A8B71 /* ItaniumCXXABI.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = ItaniumCXXABI.cpp; path = lib/CodeGen/ItaniumCXXABI.cpp; sourceTree = ""; }; BF9FEE341225E8B1003A8B71 /* MicrosoftCXXABI.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = MicrosoftCXXABI.cpp; path = lib/CodeGen/MicrosoftCXXABI.cpp; sourceTree = ""; }; BF9FEE361225E8CF003A8B71 /* README.txt */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; name = README.txt; path = lib/CodeGen/README.txt; sourceTree = ""; }; - BF9FEE371225E925003A8B71 /* BoostConAction.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = BoostConAction.cpp; path = lib/Frontend/BoostConAction.cpp; sourceTree = ""; }; BF9FEE451225EA24003A8B71 /* DelayedDiagnostic.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = DelayedDiagnostic.h; path = clang/Sema/DelayedDiagnostic.h; sourceTree = ""; }; BF9FEE511226FE9F003A8B71 /* ParseAST.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = ParseAST.cpp; path = lib/Parse/ParseAST.cpp; sourceTree = ""; }; BF9FEE531226FEC1003A8B71 /* RAIIObjectsForParser.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = RAIIObjectsForParser.h; path = lib/Parse/RAIIObjectsForParser.h; sourceTree = ""; }; @@ -777,6 +782,7 @@ 08FB7795FE84155DC02AAC07 /* Libraries */ = { isa = PBXGroup; children = ( + BB20603A131EDDBF003C3343 /* ARRMigrate */, BBA5AB121309C2FA000B38F1 /* StaticAnalyzer */, 57EB5660121B034300ECA335 /* Serialization */, BFE2F67911DA95590007EDC0 /* Rewrite */, @@ -899,7 +905,6 @@ 352246E00F5C6BC000D0D279 /* Frontend */ = { isa = PBXGroup; children = ( - BF9FEE371225E925003A8B71 /* BoostConAction.cpp */, 1AFDD8701161085D00AE030A /* ASTMerge.cpp */, 9012911C1048068D0083456D /* ASTUnit.cpp */, 1A2A54A50FD1DD1C00F4CE45 /* ASTConsumers.cpp */, @@ -1105,6 +1110,38 @@ name = "index-test"; sourceTree = ""; }; + BB20603A131EDDBF003C3343 /* ARRMigrate */ = { + isa = PBXGroup; + children = ( + BB20603B131EDDBF003C3343 /* CMakeLists.txt */, + BB20603C131EDDBF003C3343 /* Makefile */, + BDDF60E91337BF40009F1764 /* Transforms.cpp */, + ); + name = ARRMigrate; + path = lib/ARRMigrate; + sourceTree = ""; + }; + BB206040131EDDDA003C3343 /* ARRMigrate */ = { + isa = PBXGroup; + children = ( + BB206041131EDDDA003C3343 /* ARRMT.h */, + ); + name = ARRMigrate; + path = clang/ARRMigrate; + sourceTree = ""; + }; + BB206042131EDE03003C3343 /* arrmt-test */ = { + isa = PBXGroup; + children = ( + BD8A47E7133D32660066FE40 /* ARRMT.cpp */, + BB206043131EDE03003C3343 /* arrmt-test.cpp */, + BB206044131EDE03003C3343 /* CMakeLists.txt */, + BB206045131EDE03003C3343 /* Makefile */, + ); + name = "arrmt-test"; + path = "tools/arrmt-test"; + sourceTree = ""; + }; BBA5AB121309C2FA000B38F1 /* StaticAnalyzer */ = { isa = PBXGroup; children = ( @@ -1575,6 +1612,7 @@ DED7D72E0A524295003AD0FB /* include */ = { isa = PBXGroup; children = ( + BB206040131EDDDA003C3343 /* ARRMigrate */, DED7D7300A524295003AD0FB /* Basic */, DED7D7390A524295003AD0FB /* Lex */, DE1F21F20A7D84E800FBF588 /* Parse */, @@ -1724,6 +1762,7 @@ DEDFE61F0F7B3AE10035BD10 /* Tools */ = { isa = PBXGroup; children = ( + BB206042131EDE03003C3343 /* arrmt-test */, 90F9EFA8104ABDC400D09A15 /* c-index-test */, 9012911E104812DA0083456D /* CIndex */, 90FD6DB4103D9763005F5B73 /* index-test */, Added: vendor/clang/dist/docs/AutomaticReferenceCounting.html ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ vendor/clang/dist/docs/AutomaticReferenceCounting.html Sun Jul 17 15:40:56 2011 (r224135) @@ -0,0 +1,1857 @@ + + +Objective-C Automatic Reference Counting (ARC) + + + + + + + + + + +
+

Automatic Reference Counting

+ +
+
+ +
+

About this document

+ +
+

Purpose

+ +

The first and primary purpose of this document is to serve as a +complete technical specification of Automatic Reference Counting. +Given a core Objective-C compiler and runtime, it should be possible +to write a compiler and runtime which implements these new +semantics.

+ +

The secondary purpose is to act as a rationale for why ARC was +designed in this way. This should remain tightly focused on the +technical design and should not stray into marketing speculation.

+ +
+ +
+

Background

+ +

This document assumes a basic familiarity with C.

+ +

Blocks are a C language extension for +creating anonymous functions. Users interact with and transfer block +objects using block pointers, which are +represented like a normal pointer. A block may capture values from +local variables; when this occurs, memory must be dynamically +allocated. The initial allocation is done on the stack, but the +runtime provides a Block_copy function which, given a block +pointer, either copies the underlying block object to the heap, +setting its reference count to 1 and returning the new block pointer, +or (if the block object is already on the heap) increases its +reference count by 1. The paired function is Block_release, +which decreases the reference count by 1 and destroys the object if +the count reaches zero and is on the heap.

+ +

Objective-C is a set of language extensions, significant enough to +be considered a different language. It is a strict superset of C. +The extensions can also be imposed on C++, producing a language called +Objective-C++. The primary feature is a single-inheritance object +system; we briefly describe the modern dialect.

+ +

Objective-C defines a new type kind, collectively called +the object pointer types. This kind has two +notable builtin members, id and Class; id +is the final supertype of all object pointers. The validity of +conversions between object pointer types is not checked at runtime. +Users may define classes; each class is a +type, and the pointer to that type is an object pointer type. A class +may have a superclass; its pointer type is a subtype of its +superclass's pointer type. A class has a set +of ivars, fields which appear on all +instances of that class. For every class T there's an +associated metaclass; it has no fields, its superclass is the +metaclass of T's superclass, and its metaclass is a global +class. Every class has a global object whose class is the +class's metaclass; metaclasses have no associated type, so pointers to +this object have type Class.

+ +

A class declaration (@interface) declares a set +of methods. A method has a return type, a +list of argument types, and a selector: a +name like foo:bar:baz:, where the number of colons +corresponds to the number of formal arguments. A method may be an +instance method, in which case it can be invoked on objects of the +class, or a class method, in which case it can be invoked on objects +of the metaclass. A method may be invoked by providing an object +(called the receiver) and a list of formal +arguments interspersed with the selector, like so:

+ +
[receiver foo: fooArg bar: barArg baz: bazArg]
+ +

This looks in the dynamic class of the receiver for a method with +this name, then in that class's superclass, etc., until it finds +something it can execute. The receiver expression may also be +the name of a class, in which case the actual receiver is the class +object for that class, or (within method definitions) it may +be super, in which case the lookup algorithm starts with the +static superclass instead of the dynamic class. The actual methods +dynamically found in a class are not those declared in the +@interface, but those defined in a separate +@implementation declaration; however, when compiling a +call, typechecking is done based on the methods declared in the +@interface.

+ +

Method declarations may also be grouped into +protocols, which are not inherently +associated with any class, but which classes may claim to follow. +Object pointer types may be qualified with additional protocols that +the object is known to support.

+ +

Class extensions are collections of ivars +and methods, designed to allow a class's @interface to be +split across multiple files; however, there is still a primary +implementation file which must see the @interfaces of all +class extensions. +Categories allow methods (but not ivars) to +be declared post hoc on an arbitrary class; the methods in the +category's @implementation will be dynamically added to that +class's method tables which the category is loaded at runtime, +replacing those methods in case of a collision.

+ +

In the standard environment, objects are allocated on the heap, and +their lifetime is manually managed using a reference count. This is +done using two instance methods which all classes are expected to +implement: retain increases the object's reference count by +1, whereas release decreases it by 1 and calls the instance +method dealloc if the count reaches 0. To simplify certain +operations, there is also an autorelease +pool, a thread-local list of objects to call release +on later; an object can be added to this pool by +calling autorelease on it.

+ +

Block pointers may be converted to type id; block objects +are laid out in a way that makes them compatible with Objective-C +objects. There is a builtin class that all block objects are +considered to be objects of; this class implements retain by +adjusting the reference count, not by calling Block_copy.

+ +
+ +
+ +
+

General

+ +

Automatic Reference Counting implements automatic memory management +for Objective-C objects and blocks, freeing the programmer from the +need explicitly insert retains and releases. It does not provide a +cycle collector; users must explicitly manage lifetime instead.

+ +

ARC may be explicitly enabled with the compiler +flag -fobjc-arc. It may also be explicitly disabled with the +compiler flag -fno-objc-arc. The last of these two flags +appearing on the compile line wins.

+ +

If ARC is enabled, __has_feature(objc_arc) will expand to +1 in the preprocessor. For more information about __has_feature, +see the language +extensions document.

+ +
+ +
+

Retainable object pointers

+ +

This section describes retainable object pointers, their basic +operations, and the restrictions imposed on their use under ARC. Note +in particular that it covers the rules for pointer values +(patterns of bits indicating the location of a pointed-to object), not +pointer +objects (locations in memory which store pointer values). +The rules for objects are covered in the next section.

+ +

A retainable object pointer +(or retainable pointer) is a value of +a retainable object pointer type +(retainable type). There are three kinds of retainable object +pointer types:

+
    +
  • block pointers (formed by applying the caret (^) +declarator sigil to a function type)
    • +
  • Objective-C object pointers (id, Class, NSFoo*, etc.)
    • +
  • typedefs marked with __attribute__((NSObject))
    • +
+ +

Other pointer types, such as int* and CFStringRef, +are not subject to ARC's semantics and restrictions.

+ +
+ +

Rationale: We are not at liberty to require +all code to be recompiled with ARC; therefore, ARC must interoperate +with Objective-C code which manages retains and releases manually. In +general, there are three requirements in order for a +compiler-supported reference-count system to provide reliable +interoperation:

+ +
    +
  • The type system must reliably identify which objects are to be +managed. An int* might be a pointer to a malloc'ed +array, or it might be a interior pointer to such an array, or it might +point to some field or local variable. In contrast, values of the +retainable object pointer types are never interior.
    • +
  • The type system must reliably indicate how to +manage objects of a type. This usually means that the type must imply +a procedure for incrementing and decrementing retain counts. +Supporting single-ownership objects requires a lot more explicit +mediation in the language.
    • +
  • There must be reliable conventions for whether and +when ownership is passed between caller and callee, for both +arguments and return values. Objective-C methods follow such a +convention very reliably, at least for system libraries on Mac OS X, +and functions always pass objects at +0. The C-based APIs for Core +Foundation objects, on the other hand, have much more varied transfer +semantics.
    • +
+
+ +

The use of __attribute__((NSObject)) typedefs is not +recommended. If it's absolutely necessary to use this attribute, be +very explicit about using the typedef, and do not assume that it will +be preserved by language features like __typeof and C++ +template argument substitution.

+ +

Rationale: any compiler operation which +incidentally strips type sugar from a type will yield a type +without the attribute, which may result in unexpected +behavior.

+ +
+

Retain count semantics

+ +

A retainable object pointer is either a null +pointer or a pointer to a valid object. Furthermore, if it has +block pointer type and is not null then it must actually be a +pointer to a block object, and if it has Class type (possibly +protocol-qualified) then it must actually be a pointer to a class +object. Otherwise ARC does not enforce the Objective-C type system as +long as the implementing methods follow the signature of the static +type. It is undefined behavior if ARC is exposed to an invalid +pointer.

+ +

For ARC's purposes, a valid object is one with well-behaved +retaining operations. Specifically, the object must be laid out such +that the Objective-C message send machinery can successfully send it +the following messages:

+ +
    +
  • retain, taking no arguments and returning a pointer to +the object.
    • +
  • release, taking no arguments and returning void.
    • +
  • autorelease, taking no arguments and returning a pointer +to the object.
    • +
+ +

The behavior of these methods is constrained in the following ways. +The term high-level semantics is an +intentionally vague term; the intent is that programmers must +implement these methods in a way such that the compiler, modifying +code in ways it deems safe according to these constraints, will not +violate their requirements. For example, if the user puts logging +statements in retain, they should not be surprised if those +statements are executed more or less often depending on optimization +settings. These constraints are not exhaustive of the optimization +opportunities: values held in local variables are subject to +additional restrictions, described later in this document.

+ +

It is undefined behavior if a computation history featuring a send +of retain followed by a send of release to the same +object, with no intervening release on that object, is not +equivalent under the high-level semantics to a computation +history in which these sends are removed. Note that this implies that +these methods may not raise exceptions.

+ +

It is undefined behavior if a computation history features any use +whatsoever of an object following the completion of a send +of release that is not preceded by a send of retain +to the same object.

+ +

The behavior of autorelease must be equivalent to sending +release when one of the autorelease pools currently in scope +is popped. It may not throw an exception.

+ +

When the semantics call for performing one of these operations on a +retainable object pointer, if that pointer is null then the +effect is a no-op.

+ +

All of the semantics described in this document are subject to +additional optimization rules which permit +the removal or optimization of operations based on local knowledge of +data flow. The semantics describe the high-level behaviors that the +compiler implements, not an exact sequence of operations that a +program will be compiled into.

+ +
+ +
+

Retainable object pointers as operands and arguments

+ +

In general, ARC does not perform retain or release operations when +simply using a retainable object pointer as an operand within an +expression. This includes:

+
    +
  • loading a retainable pointer from an object with non-weak +ownership,
    • +
  • passing a retainable pointer as an argument to a function or +method, and
    • +
  • receiving a retainable pointer as the result of a function or +method call.
    • +
+ +

Rationale: while this might seem +uncontroversial, it is actually unsafe when multiple expressions are +evaluated in parallel, as with binary operators and calls, +because (for example) one expression might load from an object while +another writes to it. However, C and C++ already call this undefined +behavior because the evaluations are unsequenced, and ARC simply +exploits that here to avoid needing to retain arguments across a large +number of calls.

+ +

The remainder of this section describes exceptions to these rules, +how those exceptions are detected, and what those exceptions imply +semantically.

+ +
+

Consumed parameters

+ +

A function or method parameter of retainable object pointer type +may be marked as consumed, signifying that +the callee expects to take ownership of a +1 retain count. This is +done by adding the ns_consumed attribute to the parameter +declaration, like so:

+ +
void foo(__attribute((ns_consumed)) id x);
+- (void) foo: (id) __attribute((ns_consumed)) x;
+ +

This attribute is part of the type of the function or method, not +the type of the parameter. It controls only how the argument is +passed and received.

+ +

When passing such an argument, ARC retains the argument prior to +making the call.

+ +

When receiving such an argument, ARC releases the argument at the +end of the function, subject to the usual optimizations for local +values.

+ +

Rationale: this formalizes direct transfers +of ownership from a caller to a callee. The most common scenario here +is passing the self parameter to init, but it is +useful to generalize. Typically, local optimization will remove any +extra retains and releases: on the caller side the retain will be +merged with a +1 source, and on the callee side the release will be +rolled into the initialization of the parameter.

+ +

The implicit self parameter of a method may be marked as +consumed by adding __attribute__((ns_consumes_self)) to the +method declaration. Methods in the init +family are treated as if they were implicitly +marked with this attribute.

+ +

It is undefined behavior if an Objective-C message send to a method +with ns_consumed parameters (other than self) is made with a +null receiver. It is undefined behavior if the method to which an +Objective-C message send statically resolves to has a different set +of ns_consumed parameters than the method it dynamically +resolves to. It is undefined behavior if a block or function call is +made through a static type with a different set of ns_consumed +parameters than the implementation of the called block or function.

+ +

Rationale: consumed parameters with null +receiver are a guaranteed leak. Mismatches with consumed parameters +will cause over-retains or over-releases, depending on the direction. +The rule about function calls is really just an application of the +existing C/C++ rule about calling functions through an incompatible +function type, but it's useful to state it explicitly.

+ +
+ +
+

Retained return values

+ +

A function or method which returns a retainable object pointer type +may be marked as returning a retained value, signifying that the +caller expects to take ownership of a +1 retain count. This is done +by adding the ns_returns_retained attribute to the function or +method declaration, like so:

+ +
id foo(void) __attribute((ns_returns_retained));
+- (id) foo __attribute((ns_returns_retained));
+ +

This attribute is part of the type of the function or method.

+ +

When returning from such a function or method, ARC retains the +value at the point of evaluation of the return statement, before +leaving all local scopes.

+ +

When receiving a return result from such a function or method, ARC +releases the value at the end of the full-expression it is contained +within, subject to the usual optimizations for local values.

+ +

Rationale: this formalizes direct transfers of +ownership from a callee to a caller. The most common scenario this +models is the retained return from init, alloc, +new, and copy methods, but there are other cases in +the frameworks. After optimization there are typically no extra +retains and releases required.

+ +

Methods in +the alloc, copy, init, mutableCopy, +and new families are implicitly marked +__attribute__((ns_returns_retained)). This may be suppressed +by explicitly marking the +method __attribute__((ns_returns_not_retained)).

+
+ +

It is undefined behavior if the method to which an Objective-C +message send statically resolves has different retain semantics on its +result from the method it dynamically resolves to. It is undefined +behavior if a block or function call is made through a static type +with different retain semantics on its result from the implementation +of the called block or function.

+ +

Rationale: Mismatches with returned results +will cause over-retains or over-releases, depending on the direction. +Again, the rule about function calls is really just an application of +the existing C/C++ rule about calling functions through an +incompatible function type.

+ + +
+

Unretained return values

+ +

A method or function which returns a retainable object type but +does not return a retained value must ensure that the object is +still valid across the return boundary.

+ +

When returning from such a function or method, ARC retains the +value at the point of evaluation of the return statement, then leaves +all local scopes, and then balances out the retain while ensuring that +the value lives across the call boundary. In the worst case, this may +involve an autorelease, but callers must not assume that the +value is actually in the autorelease pool.

+ +

ARC performs no extra mandatory work on the caller side, although +it may elect to do something to shorten the lifetime of the returned +value.

+ +

Rationale: it is common in non-ARC code to not +return an autoreleased value; therefore the convention does not force +either path. It is convenient to not be required to do unnecessary +retains and autoreleases; this permits optimizations such as eliding +retain/autoreleases when it can be shown that the original pointer +will still be valid at the point of return.

+ +

A method or function may be marked +with __attribute__((ns_returns_autoreleased)) to indicate +that it returns a pointer which is guaranteed to be valid at least as +long as the innermost autorelease pool. There are no additional +semantics enforced in the definition of such a method; it merely +enables optimizations in callers.

+
+ +
+

Bridged casts

+ +

A bridged cast is a C-style cast +annotated with one of three keywords:

+ +
    +
  • (__bridge T) op casts the operand to the destination +type T. If T is a retainable object pointer type, +then op must have a non-retainable pointer type. +If T is a non-retainable pointer type, then op must +have a retainable object pointer type. Otherwise the cast is +ill-formed. There is no transfer of ownership, and ARC inserts +no retain operations.
    • + +
  • (__bridge_retained T) op casts the operand, which must +have retainable object pointer type, to the destination type, which +must be a non-retainable pointer type. ARC retains the value, subject +to the usual optimizations on local values, and the recipient is +responsible for balancing that +1.
    • + +
  • (__bridge_transfer T) op casts the operand, which must +have non-retainable pointer type, to the destination type, which must +be a retainable object pointer type. ARC will release the value at +the end of the enclosing full-expression, subject to the usual +optimizations on local values.
    • +
+ +

These casts are required in order to transfer objects in and out of +ARC control; see the rationale in the section +on conversion of retainable +object pointers.

+ +

Using a __bridge_retained or __bridge_transfer +cast purely to convince ARC to emit an unbalanced retain or release, +respectively, is poor form.

+ +
+ +
+ +
+

Restrictions

+ +
+

Conversion of retainable object pointers

+ +

In general, a program which attempts to implicitly or explicitly +convert a value of retainable object pointer type to any +non-retainable type, or vice-versa, is ill-formed. For example, an +Objective-C object pointer shall not be converted to void*. +As an exception, cast to intptr_t is allowed becuase such +casts are not transferring ownership. The bridged +casts may be used to perform these conversions where +necessary.

+ +

Rationale: we cannot ensure the correct +management of the lifetime of objects if they may be freely passed +around as unmanaged types. The bridged casts are provided so that the +programmer may explicitly describe whether the cast transfers control +into or out of ARC.

+
+ +

An unbridged cast to a retainable object pointer type of the return +value of a Objective-C message send which yields a non-retainable +pointer is treated as a __bridge_transfer cast +if:

+ +
    +
  • the method has the cf_returns_retained attribute, or if +not that,
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