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// 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.
#if !V8_ENABLE_WEBASSEMBLY
#error This header should only be included if WebAssembly is enabled.
#endif // !V8_ENABLE_WEBASSEMBLY
#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 limits the amount of *declared* memory. At runtime, memory can
// only grow up to kV8MaxWasmMemoryPages.
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 kV8MaxWasmTags = 1000000;
constexpr size_t kV8MaxWasmExceptionTypes = 1000000;
constexpr size_t kV8MaxWasmDataSegments = 100000;
// This indicates the maximum memory size our implementation supports.
// Do not use this limit directly; use {max_mem_pages()} instead to take the
// spec'ed limit as well as command line flag into account.
// Also, do not use this limit to validate declared memory, use
// kSpecMaxMemoryPages for that.
constexpr size_t kV8MaxWasmMemoryPages = kSystemPointerSize == 4
? 32768 // = 2 GiB
: 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 kV8MaxWasmFunctionReturns = 1000;
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;
// GC proposal. These limits are not standardized yet.
constexpr size_t kV8MaxWasmStructFields = 999;
constexpr uint32_t kV8MaxRttSubtypingDepth = 31;
// Maximum supported by implementation: ((1<<27)-3).
// Reason: total object size in bytes must fit into a Smi, for filler objects.
constexpr size_t kV8MaxWasmArrayLength = 1u << 26;
constexpr size_t kV8MaxWasmArrayInitLength = 999;
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
// The following functions are defined in wasm-engine.cc.
// Maximum number of pages we can allocate. This might be lower than the number
// of pages that can be declared (e.g. as maximum): kSpecMaxMemoryPages.
// 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_mem_pages();
inline uint64_t max_mem_bytes() {
return uint64_t{max_mem_pages()} * kWasmPageSize;
}
uint32_t max_table_init_entries();
size_t max_module_size();
} // namespace wasm
} // namespace internal
} // namespace v8
#endif // V8_WASM_WASM_LIMITS_H_
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