// 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 1 #ifdef __ARM_ARCH_EXT_IDIV__ #define CAN_USE_SUDIV 1 #endif #ifndef CAN_USE_VFP3_INSTRUCTIONS #define CAN_USE_VFP3_INSTRUCTIONS 1 #endif #endif #if defined(__ARM_ARCH_8A__) #define CAN_USE_ARMV7_INSTRUCTIONS 1 #define CAN_USE_SUDIV 1 #define CAN_USE_ARMV8_INSTRUCTIONS 1 #ifndef CAN_USE_VFP3_INSTRUCTIONS #define CAN_USE_VFP3_INSTRUCTIONS 1 #endif #endif // pthread_jit_write_protect is only available on arm64 Mac. #if defined(V8_OS_MACOS) && defined(V8_HOST_ARCH_ARM64) #define V8_HAS_PTHREAD_JIT_WRITE_PROTECT 1 #else #define V8_HAS_PTHREAD_JIT_WRITE_PROTECT 0 #endif #if defined(V8_TARGET_ARCH_IA32) || defined(V8_TARGET_ARCH_X64) #define V8_TARGET_ARCH_STORES_RETURN_ADDRESS_ON_STACK true #else #define V8_TARGET_ARCH_STORES_RETURN_ADDRESS_ON_STACK false #endif constexpr int kReturnAddressStackSlotCount = V8_TARGET_ARCH_STORES_RETURN_ADDRESS_ON_STACK ? 1 : 0; // Number of bits to represent the page size for paged spaces. #if (defined(V8_HOST_ARCH_PPC) || defined(V8_HOST_ARCH_PPC64)) && !defined(_AIX) // Native PPC linux has large (64KB) physical pages. // Simulator (and Aix) need to use the same value as x64. const 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. const int kHugePageBits = 21; const int kHugePageSize = (1U) << kHugePageBits; const 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. const int kPageSizeBits = 18; #endif #endif // V8_BASE_BUILD_CONFIG_H_