// Copyright 2016 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_WASM_WASM_LIMITS_H_ #define V8_WASM_WASM_LIMITS_H_ #include <cstddef> #include <cstdint> #include <limits> #include "src/base/macros.h" #include "src/wasm/wasm-constants.h" namespace v8 { namespace internal { namespace wasm { // This constant is defined in the Wasm JS API spec and as such only // concern JS embeddings. constexpr size_t kSpecMaxMemoryPages = 65536; // The following limits are imposed by V8 on WebAssembly modules. // The limits are agreed upon with other engines for consistency. constexpr size_t kV8MaxWasmTypes = 1000000; constexpr size_t kV8MaxWasmFunctions = 1000000; constexpr size_t kV8MaxWasmImports = 100000; constexpr size_t kV8MaxWasmExports = 100000; constexpr size_t kV8MaxWasmGlobals = 1000000; constexpr size_t kV8MaxWasmExceptions = 1000000; constexpr size_t kV8MaxWasmExceptionTypes = 1000000; constexpr size_t kV8MaxWasmDataSegments = 100000; // This indicates the maximum memory size our implementation supports. // Don't use this limit directly; use {max_initial_mem_pages()} instead // to take the spec'ed limit as well as command line flag into account. constexpr size_t kV8MaxWasmMemoryPages = 65536; // = 4 GiB constexpr size_t kV8MaxWasmStringSize = 100000; constexpr size_t kV8MaxWasmModuleSize = 1024 * 1024 * 1024; // = 1 GiB constexpr size_t kV8MaxWasmFunctionSize = 7654321; constexpr size_t kV8MaxWasmFunctionLocals = 50000; constexpr size_t kV8MaxWasmFunctionParams = 1000; constexpr size_t kV8MaxWasmFunctionMultiReturns = 1000; constexpr size_t kV8MaxWasmFunctionReturns = 1; constexpr size_t kV8MaxWasmFunctionBrTableSize = 65520; // Don't use this limit directly, but use the value of FLAG_wasm_max_table_size. constexpr size_t kV8MaxWasmTableSize = 10000000; constexpr size_t kV8MaxWasmTableInitEntries = 10000000; constexpr size_t kV8MaxWasmTables = 1; constexpr size_t kV8MaxWasmMemories = 1; static_assert(kV8MaxWasmTableSize <= 4294967295, // 2^32 - 1 "v8 should not exceed WebAssembly's non-web embedding limits"); static_assert(kV8MaxWasmTableInitEntries <= kV8MaxWasmTableSize, "JS-API should not exceed v8's limit"); constexpr uint64_t kWasmMaxHeapOffset = static_cast<uint64_t>( std::numeric_limits<uint32_t>::max()) // maximum base value + std::numeric_limits<uint32_t>::max(); // maximum index value // Defined in wasm-engine.cc. // TODO(wasm): Make this size_t for wasm64. Currently the --wasm-max-mem-pages // flag is only uint32_t. V8_EXPORT_PRIVATE uint32_t max_initial_mem_pages(); V8_EXPORT_PRIVATE uint32_t max_maximum_mem_pages(); uint32_t max_table_init_entries(); size_t max_module_size(); inline uint64_t max_mem_bytes() { return uint64_t{max_maximum_mem_pages()} * kWasmPageSize; } } // namespace wasm } // namespace internal } // namespace v8 #endif // V8_WASM_WASM_LIMITS_H_