| /* |
| * Copyright 2016 WebAssembly Community Group participants |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| // |
| // Implementation of the shell interpreter execution environment |
| // |
| |
| #ifndef wasm_shell_interface_h |
| #define wasm_shell_interface_h |
| |
| #include "asmjs/shared-constants.h" |
| #include "ir/module-utils.h" |
| #include "shared-constants.h" |
| #include "support/name.h" |
| #include "wasm-interpreter.h" |
| #include "wasm.h" |
| |
| namespace wasm { |
| |
| struct ExitException {}; |
| struct TrapException {}; |
| |
| struct ShellExternalInterface : ModuleInstance::ExternalInterface { |
| // The underlying memory can be accessed through unaligned pointers which |
| // isn't well-behaved in C++. WebAssembly nonetheless expects it to behave |
| // properly. Avoid emitting unaligned load/store by checking for alignment |
| // explicitly, and performing memcpy if unaligned. |
| // |
| // The allocated memory tries to have the same alignment as the memory being |
| // simulated. |
| class Memory { |
| // Use char because it doesn't run afoul of aliasing rules. |
| std::vector<char> memory; |
| template<typename T> static bool aligned(const char* address) { |
| static_assert(!(sizeof(T) & (sizeof(T) - 1)), "must be a power of 2"); |
| return 0 == (reinterpret_cast<uintptr_t>(address) & (sizeof(T) - 1)); |
| } |
| Memory(Memory&) = delete; |
| Memory& operator=(const Memory&) = delete; |
| |
| public: |
| Memory() = default; |
| void resize(size_t newSize) { |
| // Ensure the smallest allocation is large enough that most allocators |
| // will provide page-aligned storage. This hopefully allows the |
| // interpreter's memory to be as aligned as the memory being simulated, |
| // ensuring that the performance doesn't needlessly degrade. |
| // |
| // The code is optimistic this will work until WG21's p0035r0 happens. |
| const size_t minSize = 1 << 12; |
| size_t oldSize = memory.size(); |
| memory.resize(std::max(minSize, newSize)); |
| if (newSize < oldSize && newSize < minSize) { |
| std::memset(&memory[newSize], 0, minSize - newSize); |
| } |
| } |
| template<typename T> void set(size_t address, T value) { |
| if (aligned<T>(&memory[address])) { |
| *reinterpret_cast<T*>(&memory[address]) = value; |
| } else { |
| std::memcpy(&memory[address], &value, sizeof(T)); |
| } |
| } |
| template<typename T> T get(size_t address) { |
| if (aligned<T>(&memory[address])) { |
| return *reinterpret_cast<T*>(&memory[address]); |
| } else { |
| T loaded; |
| std::memcpy(&loaded, &memory[address], sizeof(T)); |
| return loaded; |
| } |
| } |
| } memory; |
| |
| std::vector<Name> table; |
| |
| ShellExternalInterface() : memory() {} |
| virtual ~ShellExternalInterface() = default; |
| |
| void init(Module& wasm, ModuleInstance& instance) override { |
| memory.resize(wasm.memory.initial * wasm::Memory::kPageSize); |
| table.resize(wasm.table.initial); |
| } |
| |
| void importGlobals(std::map<Name, Literal>& globals, Module& wasm) override { |
| // add spectest globals |
| ModuleUtils::iterImportedGlobals(wasm, [&](Global* import) { |
| if (import->module == SPECTEST && import->base.startsWith(GLOBAL)) { |
| switch (import->type.getSingle()) { |
| case Type::i32: |
| globals[import->name] = Literal(int32_t(666)); |
| break; |
| case Type::i64: |
| globals[import->name] = Literal(int64_t(666)); |
| break; |
| case Type::f32: |
| globals[import->name] = Literal(float(666.6)); |
| break; |
| case Type::f64: |
| globals[import->name] = Literal(double(666.6)); |
| break; |
| case Type::v128: |
| assert(false && "v128 not implemented yet"); |
| case Type::funcref: |
| case Type::anyref: |
| case Type::nullref: |
| case Type::exnref: |
| globals[import->name] = Literal::makeNullref(); |
| break; |
| case Type::none: |
| case Type::unreachable: |
| WASM_UNREACHABLE("unexpected type"); |
| } |
| } |
| }); |
| if (wasm.memory.imported() && wasm.memory.module == SPECTEST && |
| wasm.memory.base == MEMORY) { |
| // imported memory has initial 1 and max 2 |
| wasm.memory.initial = 1; |
| wasm.memory.max = 2; |
| } |
| } |
| |
| Literal callImport(Function* import, LiteralList& arguments) override { |
| if (import->module == SPECTEST && import->base.startsWith(PRINT)) { |
| for (auto argument : arguments) { |
| std::cout << argument << " : " << argument.type << '\n'; |
| } |
| return Literal(); |
| } else if (import->module == ENV && import->base == EXIT) { |
| // XXX hack for torture tests |
| std::cout << "exit()\n"; |
| throw ExitException(); |
| } |
| Fatal() << "callImport: unknown import: " << import->module.str << "." |
| << import->name.str; |
| } |
| |
| Literal callTable(Index index, |
| Signature sig, |
| LiteralList& arguments, |
| Type results, |
| ModuleInstance& instance) override { |
| if (index >= table.size()) { |
| trap("callTable overflow"); |
| } |
| auto* func = instance.wasm.getFunctionOrNull(table[index]); |
| if (!func) { |
| trap("uninitialized table element"); |
| } |
| if (sig != func->sig) { |
| trap("callIndirect: function signatures don't match"); |
| } |
| const std::vector<Type>& params = func->sig.params.expand(); |
| if (params.size() != arguments.size()) { |
| trap("callIndirect: bad # of arguments"); |
| } |
| for (size_t i = 0; i < params.size(); i++) { |
| if (!Type::isSubType(arguments[i].type, params[i])) { |
| trap("callIndirect: bad argument type"); |
| } |
| } |
| if (func->sig.results != results) { |
| trap("callIndirect: bad result type"); |
| } |
| if (func->imported()) { |
| return callImport(func, arguments); |
| } else { |
| return instance.callFunctionInternal(func->name, arguments); |
| } |
| } |
| |
| int8_t load8s(Address addr) override { return memory.get<int8_t>(addr); } |
| uint8_t load8u(Address addr) override { return memory.get<uint8_t>(addr); } |
| int16_t load16s(Address addr) override { return memory.get<int16_t>(addr); } |
| uint16_t load16u(Address addr) override { return memory.get<uint16_t>(addr); } |
| int32_t load32s(Address addr) override { return memory.get<int32_t>(addr); } |
| uint32_t load32u(Address addr) override { return memory.get<uint32_t>(addr); } |
| int64_t load64s(Address addr) override { return memory.get<int64_t>(addr); } |
| uint64_t load64u(Address addr) override { return memory.get<uint64_t>(addr); } |
| std::array<uint8_t, 16> load128(Address addr) override { |
| return memory.get<std::array<uint8_t, 16>>(addr); |
| } |
| |
| void store8(Address addr, int8_t value) override { |
| memory.set<int8_t>(addr, value); |
| } |
| void store16(Address addr, int16_t value) override { |
| memory.set<int16_t>(addr, value); |
| } |
| void store32(Address addr, int32_t value) override { |
| memory.set<int32_t>(addr, value); |
| } |
| void store64(Address addr, int64_t value) override { |
| memory.set<int64_t>(addr, value); |
| } |
| void store128(Address addr, const std::array<uint8_t, 16>& value) override { |
| memory.set<std::array<uint8_t, 16>>(addr, value); |
| } |
| |
| void tableStore(Address addr, Name entry) override { table[addr] = entry; } |
| |
| void growMemory(Address /*oldSize*/, Address newSize) override { |
| memory.resize(newSize); |
| } |
| |
| void trap(const char* why) override { |
| std::cerr << "[trap " << why << "]\n"; |
| throw TrapException(); |
| } |
| }; |
| |
| } // namespace wasm |
| |
| #endif // wasm_shell_interface_h |