// Copyright 2014 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef V8_BASE_BUILD_CONFIG_H_ #define V8_BASE_BUILD_CONFIG_H_ #include "include/v8config.h" #if defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7R__) || \ defined(__ARM_ARCH_7__) #define CAN_USE_ARMV7_INSTRUCTIONS … #ifdef __ARM_ARCH_EXT_IDIV__ #define CAN_USE_SUDIV … #endif #ifndef CAN_USE_VFP3_INSTRUCTIONS #define CAN_USE_VFP3_INSTRUCTIONS … #endif #endif #if defined(__ARM_ARCH_8A__) #define CAN_USE_ARMV7_INSTRUCTIONS … #define CAN_USE_SUDIV … #define CAN_USE_ARMV8_INSTRUCTIONS … #ifndef CAN_USE_VFP3_INSTRUCTIONS #define CAN_USE_VFP3_INSTRUCTIONS … #endif #endif // pthread_jit_write_protect is only available on arm64 Mac. #if defined(V8_HOST_ARCH_ARM64) && defined(V8_OS_MACOS) #define V8_HAS_PTHREAD_JIT_WRITE_PROTECT … #else #define V8_HAS_PTHREAD_JIT_WRITE_PROTECT … #endif // BrowserEngineCore JIT write protect is only available on iOS 17.4 and later. #if defined(V8_HOST_ARCH_ARM64) && defined(V8_OS_IOS) && \ defined(__IPHONE_17_4) && \ __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_17_4 #define V8_HAS_BECORE_JIT_WRITE_PROTECT … #else #define V8_HAS_BECORE_JIT_WRITE_PROTECT … #endif #if defined(V8_OS_LINUX) && defined(V8_HOST_ARCH_X64) #define V8_HAS_PKU_JIT_WRITE_PROTECT … #else #define V8_HAS_PKU_JIT_WRITE_PROTECT … #endif #if defined(V8_TARGET_ARCH_IA32) || defined(V8_TARGET_ARCH_X64) #define V8_TARGET_ARCH_STORES_RETURN_ADDRESS_ON_STACK … #else #define V8_TARGET_ARCH_STORES_RETURN_ADDRESS_ON_STACK … #endif constexpr int kReturnAddressStackSlotCount = …; // Number of bits to represent the page size for paged spaces. #if defined(V8_HOST_ARCH_PPC64) && !defined(V8_OS_AIX) // Native PPC linux has large (64KB) physical pages. // Simulator (and Aix) need to use the same value as x64. constexpr int kPageSizeBits = 19; #elif defined(ENABLE_HUGEPAGE) // When enabling huge pages, adjust V8 page size to take up exactly one huge // page. This avoids huge-page-internal fragmentation for unused address ranges. constexpr int kHugePageBits = 21; constexpr int kHugePageSize = 1 << kHugePageBits; constexpr int kPageSizeBits = kHugePageBits; #else // Arm64 supports up to 64k OS pages on Linux, however 4k pages are more common // so we keep the V8 page size at 256k. Nonetheless, we need to make sure we // don't decrease it further in the future due to reserving 3 OS pages for every // executable V8 page. constexpr int kPageSizeBits = …; #endif constexpr int kRegularPageSize = …; // The minimal supported page size by the operation system. Any region aligned // to that size needs to be individually protectable via // {base::OS::SetPermission} and friends. #if (defined(V8_OS_MACOS) && defined(V8_HOST_ARCH_ARM64)) || \ (defined(V8_OS_ANDROID) && \ (defined(V8_HOST_ARCH_ARM64) || defined(V8_HOST_ARCH_X64))) || \ defined(V8_HOST_ARCH_LOONG64) || defined(V8_HOST_ARCH_MIPS64) || \ defined(V8_OS_IOS) // Android 64 bit has experimental support for 16kB pages. // MacOS & iOS on arm64 uses 16kB pages. // LOONG64 and MIPS64 also use 16kB pages. constexpr int kMinimumOSPageSize = 16 * 1024; #elif defined(V8_OS_LINUX) && !defined(V8_OS_ANDROID) && \ (defined(V8_HOST_ARCH_ARM64) || defined(V8_HOST_ARCH_PPC64)) // Linux on arm64 (excluding android) and PPC64 can be configured for up to 64kB // pages. constexpr int kMinimumOSPageSize = 64 * 1024; #else // Everything else uses 4kB pages. constexpr int kMinimumOSPageSize = …; #endif #endif // V8_BASE_BUILD_CONFIG_H_
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