1 // Copyright 2023 The Chromium Authors 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "partition_alloc/shim/allocator_shim.h" 6 7 #include <unistd.h> 8 9 #include "build/build_config.h" 10 #include "partition_alloc/partition_alloc_buildflags.h" 11 12 #if BUILDFLAG(USE_PARTITION_ALLOC_AS_MALLOC) 13 #include "partition_alloc/shim/allocator_shim_default_dispatch_to_partition_alloc.h" 14 #endif 15 16 // No calls to malloc / new in this file. They would cause re-entrancy of 17 // the shim, which is hard to deal with. Keep this code as simple as possible 18 // and don't use any external C++ object here, not even //base ones. Even if 19 // they are safe to use today, in future they might be refactored. 20 21 #include "partition_alloc/shim/allocator_shim_functions.h" 22 #include "partition_alloc/shim/shim_alloc_functions.h" 23 24 // Cpp symbols (new / delete) should always be routed through the shim layer 25 // except on Windows and macOS (except for PartitionAlloc-Everywhere) where the 26 // malloc intercept is deep enough that it also catches the cpp calls. 27 // 28 // In case of PartitionAlloc-Everywhere on macOS, malloc backed by 29 // allocator_shim::internal::PartitionMalloc crashes on OOM, and we need to 30 // avoid crashes in case of operator new() noexcept. Thus, operator new() 31 // noexcept needs to be routed to 32 // allocator_shim::internal::PartitionMallocUnchecked through the shim layer. 33 #include "partition_alloc/shim/allocator_shim_override_cpp_symbols.h" 34 35 // Android does not support symbol interposition. The way malloc symbols are 36 // intercepted on Android is by using link-time -wrap flags. 37 #include "partition_alloc/shim/allocator_shim_override_linker_wrapped_symbols.h" 38 39 // Cross-checks. 40 41 #if defined(MEMORY_TOOL_REPLACES_ALLOCATOR) 42 #error The allocator shim should not be compiled when building for memory tools. 43 #endif 44 45 #if (defined(__GNUC__) && defined(__EXCEPTIONS)) || \ 46 (defined(_MSC_VER) && defined(_CPPUNWIND)) 47 #error This code cannot be used when exceptions are turned on. 48 #endif 49