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LibWasm: Move Wasm::BytecodeInterpreter into its own header

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This commit is contained in:
Sahan Fernando 2021-06-04 21:54:20 +10:00 committed by Ali Mohammad Pur
parent 94551149d1
commit d02e7b3811
Notes: sideshowbarker 2024-07-18 16:51:31 +09:00 
Author: https://github.com/ccapitalK
Commit: https://github.com/SerenityOS/serenity/commit/d02e7b38119
Pull-request: https://github.com/SerenityOS/serenity/pull/7772
8 changed files with 1074 additions and 1049 deletions
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2
Tests/LibWasm/test-wasm.cpp
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@ -6,7 +6,7 @@
#include <LibCore/File.h>
#include <LibTest/JavaScriptTestRunner.h>
#include <LibWasm/AbstractMachine/Interpreter.h>
#include <LibWasm/AbstractMachine/BytecodeInterpreter.h>
#include <LibWasm/Types.h>
TEST_ROOT("Userland/Libraries/LibWasm/Tests");

3
Userland/Libraries/LibWasm/AbstractMachine/AbstractMachine.cpp
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@ -4,9 +4,10 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "Interpreter.h"
#include <LibWasm/AbstractMachine/AbstractMachine.h>
#include <LibWasm/AbstractMachine/BytecodeInterpreter.h>
#include <LibWasm/AbstractMachine/Configuration.h>
#include <LibWasm/AbstractMachine/Interpreter.h>
#include <LibWasm/Types.h>
namespace Wasm {

999
Userland/Libraries/LibWasm/AbstractMachine/BytecodeInterpreter.cpp Normal file
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@ -0,0 +1,999 @@
/*
* Copyright (c) 2021, Ali Mohammad Pur <mpfard@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Debug.h>
#include <LibWasm/AbstractMachine/AbstractMachine.h>
#include <LibWasm/AbstractMachine/BytecodeInterpreter.h>
#include <LibWasm/AbstractMachine/Configuration.h>
#include <LibWasm/Opcode.h>
#include <LibWasm/Printer/Printer.h>
#include <limits.h>
#include <math.h>
namespace Wasm {
#define TRAP_IF_NOT(x) \
do { \
if (trap_if_not(x)) { \
dbgln_if(WASM_TRACE_DEBUG, "Trapped because {} failed, at line {}", #x, __LINE__); \
return; \
} \
} while (false)
#define TRAP_IF_NOT_NORETURN(x) \
do { \
if (trap_if_not(x)) { \
dbgln_if(WASM_TRACE_DEBUG, "Trapped because {} failed, at line {}", #x, __LINE__); \
} \
} while (false)
void BytecodeInterpreter::interpret(Configuration& configuration)
{
m_do_trap = false;
auto& instructions = configuration.frame().expression().instructions();
auto max_ip_value = InstructionPointer { instructions.size() };
auto& current_ip_value = configuration.ip();
while (current_ip_value < max_ip_value) {
auto& instruction = instructions[current_ip_value.value()];
auto old_ip = current_ip_value;
interpret(configuration, current_ip_value, instruction);
if (m_do_trap)
return;
if (current_ip_value == old_ip) // If no jump occurred
++current_ip_value;
}
}
void BytecodeInterpreter::branch_to_label(Configuration& configuration, LabelIndex index)
{
dbgln_if(WASM_TRACE_DEBUG, "Branch to label with index {}...", index.value());
auto label = configuration.nth_label(index.value());
TRAP_IF_NOT(label.has_value());
dbgln_if(WASM_TRACE_DEBUG, "...which is actually IP {}, and has {} result(s)", label->continuation().value(), label->arity());
auto results = pop_values(configuration, label->arity());
size_t drop_count = index.value() + 1;
for (; !configuration.stack().is_empty();) {
auto& entry = configuration.stack().peek();
if (entry.has<Label>()) {
if (--drop_count == 0)
break;
}
configuration.stack().pop();
}
for (auto& result : results)
configuration.stack().push(move(result));
configuration.ip() = label->continuation();
}
template<typename ReadType, typename PushType>
void BytecodeInterpreter::load_and_push(Configuration& configuration, Instruction const& instruction)
{
auto& address = configuration.frame().module().memories().first();
auto memory = configuration.store().get(address);
if (!memory) {
m_do_trap = true;
return;
}
auto& arg = instruction.arguments().get<Instruction::MemoryArgument>();
auto base = configuration.stack().peek().get<Value>().to<i32>();
if (!base.has_value()) {
m_do_trap = true;
return;
}
auto instance_address = base.value() + static_cast<i64>(arg.offset);
if (instance_address < 0 || static_cast<u64>(instance_address + sizeof(ReadType)) > memory->size()) {
m_do_trap = true;
dbgln("LibWasm: Memory access out of bounds (expected 0 <= {} and {} <= {})", instance_address, instance_address + sizeof(ReadType), memory->size());
return;
}
dbgln_if(WASM_TRACE_DEBUG, "load({} : {}) -> stack", instance_address, sizeof(ReadType));
auto slice = memory->data().bytes().slice(instance_address, sizeof(ReadType));
configuration.stack().peek() = Value(static_cast<PushType>(read_value<ReadType>(slice)));
}
void BytecodeInterpreter::store_to_memory(Configuration& configuration, Instruction const& instruction, ReadonlyBytes data)
{
auto& address = configuration.frame().module().memories().first();
auto memory = configuration.store().get(address);
TRAP_IF_NOT(memory);
auto& arg = instruction.arguments().get<Instruction::MemoryArgument>();
auto base = configuration.stack().pop().get<Value>().to<i32>();
TRAP_IF_NOT(base.has_value());
auto instance_address = base.value() + static_cast<i64>(arg.offset);
if (instance_address < 0 || static_cast<u64>(instance_address + data.size()) > memory->size()) {
m_do_trap = true;
dbgln("LibWasm: Memory access out of bounds (expected 0 <= {} and {} <= {})", instance_address, instance_address + data.size(), memory->size());
return;
}
dbgln_if(WASM_TRACE_DEBUG, "tempoaray({}b) -> store({})", data.size(), instance_address);
data.copy_to(memory->data().bytes().slice(instance_address, data.size()));
}
void BytecodeInterpreter::call_address(Configuration& configuration, FunctionAddress address)
{
auto instance = configuration.store().get(address);
TRAP_IF_NOT(instance);
FunctionType const* type { nullptr };
instance->visit([&](auto const& function) { type = &function.type(); });
TRAP_IF_NOT(type);
TRAP_IF_NOT(configuration.stack().entries().size() > type->parameters().size());
Vector<Value> args;
args.ensure_capacity(type->parameters().size());
auto span = configuration.stack().entries().span().slice_from_end(type->parameters().size());
for (auto& entry : span) {
auto* ptr = entry.get_pointer<Value>();
TRAP_IF_NOT(ptr != nullptr);
args.unchecked_append(*ptr);
}
configuration.stack().entries().remove(configuration.stack().size() - span.size(), span.size());
Result result { Trap {} };
{
CallFrameHandle handle { *this, configuration };
result = configuration.call(*this, address, move(args));
}
if (result.is_trap()) {
m_do_trap = true;
return;
}
configuration.stack().entries().ensure_capacity(configuration.stack().size() + result.values().size());
for (auto& entry : result.values())
configuration.stack().entries().unchecked_append(move(entry));
}
#define BINARY_NUMERIC_OPERATION(type, operator, cast, ...) \
do { \
auto rhs = configuration.stack().pop().get<Value>().to<type>(); \
auto lhs = configuration.stack().peek().get<Value>().to<type>(); \
TRAP_IF_NOT(lhs.has_value()); \
TRAP_IF_NOT(rhs.has_value()); \
__VA_ARGS__; \
auto result = lhs.value() operator rhs.value(); \
dbgln_if(WASM_TRACE_DEBUG, "{} {} {} = {}", lhs.value(), #operator, rhs.value(), result); \
configuration.stack().peek() = Value(cast(result)); \
return; \
} while (false)
#define OVF_CHECKED_BINARY_NUMERIC_OPERATION(type, operator, cast, ...) \
do { \
auto rhs = configuration.stack().pop().get<Value>().to<type>(); \
auto ulhs = configuration.stack().peek().get<Value>().to<type>(); \
TRAP_IF_NOT(ulhs.has_value()); \
TRAP_IF_NOT(rhs.has_value()); \
dbgln_if(WASM_TRACE_DEBUG, "{} {} {} = ??", ulhs.value(), #operator, rhs.value()); \
__VA_ARGS__; \
Checked lhs = ulhs.value(); \
lhs operator##= rhs.value(); \
TRAP_IF_NOT(!lhs.has_overflow()); \
auto result = lhs.value(); \
dbgln_if(WASM_TRACE_DEBUG, "{} {} {} = {}", ulhs.value(), #operator, rhs.value(), result); \
configuration.stack().peek() = Value(cast(result)); \
return; \
} while (false)
#define BINARY_PREFIX_NUMERIC_OPERATION(type, operation, cast, ...) \
do { \
auto rhs = configuration.stack().pop().get<Value>().to<type>(); \
auto lhs = configuration.stack().peek().get<Value>().to<type>(); \
TRAP_IF_NOT(lhs.has_value()); \
TRAP_IF_NOT(rhs.has_value()); \
auto result = operation(lhs.value(), rhs.value()); \
dbgln_if(WASM_TRACE_DEBUG, "{}({} {}) = {}", #operation, lhs.value(), rhs.value(), result); \
configuration.stack().peek() = Value(cast(result)); \
return; \
} while (false)
#define UNARY_MAP(pop_type, operation, ...) \
do { \
auto value = configuration.stack().peek().get<Value>().to<pop_type>(); \
TRAP_IF_NOT(value.has_value()); \
auto result = operation(value.value()); \
dbgln_if(WASM_TRACE_DEBUG, "map({}) {} = {}", #operation, value.value(), result); \
configuration.stack().peek() = Value(__VA_ARGS__(result)); \
return; \
} while (false)
#define UNARY_NUMERIC_OPERATION(type, operation) \
UNARY_MAP(type, operation, type)
#define LOAD_AND_PUSH(read_type, push_type) \
do { \
return load_and_push<read_type, push_type>(configuration, instruction); \
} while (false)
#define POP_AND_STORE(pop_type, store_type) \
do { \
auto value = ConvertToRaw<store_type> {}(*configuration.stack().pop().get<Value>().to<pop_type>()); \
dbgln_if(WASM_TRACE_DEBUG, "stack({}) -> temporary({}b)", value, sizeof(store_type)); \
store_to_memory(configuration, instruction, { &value, sizeof(store_type) }); \
return; \
} while (false)
template<typename T>
T BytecodeInterpreter::read_value(ReadonlyBytes data)
{
LittleEndian<T> value;
InputMemoryStream stream { data };
stream >> value;
if (stream.handle_any_error()) {
dbgln("Read from {} failed", data.data());
m_do_trap = true;
}
return value;
}
template<>
float BytecodeInterpreter::read_value<float>(ReadonlyBytes data)
{
InputMemoryStream stream { data };
LittleEndian<u32> raw_value;
stream >> raw_value;
if (stream.handle_any_error())
m_do_trap = true;
return bit_cast<float>(static_cast<u32>(raw_value));
}
template<>
double BytecodeInterpreter::read_value<double>(ReadonlyBytes data)
{
InputMemoryStream stream { data };
LittleEndian<u64> raw_value;
stream >> raw_value;
if (stream.handle_any_error())
m_do_trap = true;
return bit_cast<double>(static_cast<u64>(raw_value));
}
template<typename T>
struct ConvertToRaw {
T operator()(T value)
{
return LittleEndian<T>(value);
}
};
template<>
struct ConvertToRaw<float> {
u32 operator()(float value)
{
LittleEndian<u32> res;
ReadonlyBytes bytes { &value, sizeof(float) };
InputMemoryStream stream { bytes };
stream >> res;
VERIFY(!stream.has_any_error());
return static_cast<u32>(res);
}
};
template<>
struct ConvertToRaw<double> {
u64 operator()(double value)
{
LittleEndian<u64> res;
ReadonlyBytes bytes { &value, sizeof(double) };
InputMemoryStream stream { bytes };
stream >> res;
VERIFY(!stream.has_any_error());
return static_cast<u64>(res);
}
};
template<typename V, typename T>
MakeSigned<T> BytecodeInterpreter::checked_signed_truncate(V value)
{
if (isnan(value) || isinf(value)) { // "undefined", let's just trap.
m_do_trap = true;
return 0;
}
double truncated;
if constexpr (IsSame<float, V>)
truncated = truncf(value);
else
truncated = trunc(value);
using SignedT = MakeSigned<T>;
if (NumericLimits<SignedT>::min() <= truncated && static_cast<double>(NumericLimits<SignedT>::max()) >= truncated)
return static_cast<SignedT>(truncated);
dbgln_if(WASM_TRACE_DEBUG, "Truncate out of range error");
m_do_trap = true;
return true;
}
template<typename V, typename T>
MakeUnsigned<T> BytecodeInterpreter::checked_unsigned_truncate(V value)
{
if (isnan(value) || isinf(value)) { // "undefined", let's just trap.
m_do_trap = true;
return 0;
}
double truncated;
if constexpr (IsSame<float, V>)
truncated = truncf(value);
else
truncated = trunc(value);
using UnsignedT = MakeUnsigned<T>;
if (NumericLimits<UnsignedT>::min() <= truncated && static_cast<double>(NumericLimits<UnsignedT>::max()) >= truncated)
return static_cast<UnsignedT>(truncated);
dbgln_if(WASM_TRACE_DEBUG, "Truncate out of range error");
m_do_trap = true;
return true;
}
Vector<Value> BytecodeInterpreter::pop_values(Configuration& configuration, size_t count)
{
Vector<Value> results;
results.resize(count);
for (size_t i = 0; i < count; ++i) {
auto top_of_stack = configuration.stack().pop();
if (auto value = top_of_stack.get_pointer<Value>())
results[i] = move(*value);
else
TRAP_IF_NOT_NORETURN(value);
}
return results;
}
template<typename T, typename R>
ALWAYS_INLINE static T rotl(T value, R shift)
{
// generates a single 'rol' instruction if shift is positive
// otherwise generate a `ror`
auto const mask = CHAR_BIT * sizeof(T) - 1;
shift &= mask;
return (value << shift) | (value >> ((-shift) & mask));
}
template<typename T, typename R>
ALWAYS_INLINE static T rotr(T value, R shift)
{
// generates a single 'ror' instruction if shift is positive
// otherwise generate a `rol`
auto const mask = CHAR_BIT * sizeof(T) - 1;
shift &= mask;
return (value >> shift) | (value << ((-shift) & mask));
}
template<typename T>
ALWAYS_INLINE static i32 clz(T value)
{
if (value == 0)
return sizeof(T) * CHAR_BIT;
if constexpr (sizeof(T) == 4)
return __builtin_clz(value);
else if constexpr (sizeof(T) == 8)
return __builtin_clzll(value);
else
VERIFY_NOT_REACHED();
}
template<typename T>
ALWAYS_INLINE static i32 ctz(T value)
{
if (value == 0)
return sizeof(T) * CHAR_BIT;
if constexpr (sizeof(T) == 4)
return __builtin_ctz(value);
else if constexpr (sizeof(T) == 8)
return __builtin_ctzll(value);
else
VERIFY_NOT_REACHED();
}
void BytecodeInterpreter::interpret(Configuration& configuration, InstructionPointer& ip, Instruction const& instruction)
{
dbgln_if(WASM_TRACE_DEBUG, "Executing instruction {} at ip {}", instruction_name(instruction.opcode()), ip.value());
switch (instruction.opcode().value()) {
case Instructions::unreachable.value():
m_do_trap = true;
return;
case Instructions::nop.value():
return;
case Instructions::local_get.value():
configuration.stack().push(Value(configuration.frame().locals()[instruction.arguments().get<LocalIndex>().value()]));
return;
case Instructions::local_set.value(): {
auto entry = configuration.stack().pop();
configuration.frame().locals()[instruction.arguments().get<LocalIndex>().value()] = move(entry.get<Value>());
return;
}
case Instructions::i32_const.value():
configuration.stack().push(Value(ValueType { ValueType::I32 }, static_cast<i64>(instruction.arguments().get<i32>())));
return;
case Instructions::i64_const.value():
configuration.stack().push(Value(ValueType { ValueType::I64 }, instruction.arguments().get<i64>()));
return;
case Instructions::f32_const.value():
configuration.stack().push(Value(ValueType { ValueType::F32 }, static_cast<double>(instruction.arguments().get<float>())));
return;
case Instructions::f64_const.value():
configuration.stack().push(Value(ValueType { ValueType::F64 }, instruction.arguments().get<double>()));
return;
case Instructions::block.value(): {
size_t arity = 0;
auto& args = instruction.arguments().get<Instruction::StructuredInstructionArgs>();
if (args.block_type.kind() != BlockType::Empty)
arity = 1;
configuration.stack().push(Label(arity, args.end_ip));
return;
}
case Instructions::loop.value(): {
size_t arity = 0;
auto& args = instruction.arguments().get<Instruction::StructuredInstructionArgs>();
if (args.block_type.kind() != BlockType::Empty)
arity = 1;
configuration.stack().push(Label(arity, ip.value() + 1));
return;
}
case Instructions::if_.value(): {
size_t arity = 0;
auto& args = instruction.arguments().get<Instruction::StructuredInstructionArgs>();
if (args.block_type.kind() != BlockType::Empty)
arity = 1;
auto entry = configuration.stack().pop();
auto value = entry.get<Value>().to<i32>();
TRAP_IF_NOT(value.has_value());
auto end_label = Label(arity, args.end_ip.value());
if (value.value() == 0) {
if (args.else_ip.has_value()) {
configuration.ip() = args.else_ip.value();
configuration.stack().push(move(end_label));
} else {
configuration.ip() = args.end_ip.value() + 1;
}
} else {
configuration.stack().push(move(end_label));
}
return;
}
case Instructions::structured_end.value():
case Instructions::structured_else.value(): {
auto label = configuration.nth_label(0);
TRAP_IF_NOT(label.has_value());
size_t end = configuration.stack().size() - label->arity() - 1;
size_t start = end;
while (start > 0 && start < configuration.stack().size() && !configuration.stack().entries()[start].has<Label>())
--start;
configuration.stack().entries().remove(start, end - start + 1);
if (instruction.opcode() == Instructions::structured_end)
return;
// Jump to the end label
configuration.ip() = label->continuation();
return;
}
case Instructions::return_.value(): {
auto& frame = configuration.frame();
size_t end = configuration.stack().size() - frame.arity();
size_t start = end;
for (; start + 1 > 0 && start < configuration.stack().size(); --start) {
auto& entry = configuration.stack().entries()[start];
if (entry.has<Frame>()) {
// Leave the frame, _and_ its label.
start += 2;
break;
}
}
configuration.stack().entries().remove(start, end - start);
// Jump past the call/indirect instruction
configuration.ip() = configuration.frame().expression().instructions().size();
return;
}
case Instructions::br.value():
return branch_to_label(configuration, instruction.arguments().get<LabelIndex>());
case Instructions::br_if.value(): {
if (configuration.stack().pop().get<Value>().to<i32>().value_or(0) == 0)
return;
return branch_to_label(configuration, instruction.arguments().get<LabelIndex>());
}
case Instructions::br_table.value(): {
auto& arguments = instruction.arguments().get<Instruction::TableBranchArgs>();
auto entry = configuration.stack().pop();
TRAP_IF_NOT(entry.has<Value>());
auto maybe_i = entry.get<Value>().to<i32>();
TRAP_IF_NOT(maybe_i.has_value());
TRAP_IF_NOT(maybe_i.value() >= 0);
size_t i = *maybe_i;
if (i < arguments.labels.size())
return branch_to_label(configuration, arguments.labels[i]);
return branch_to_label(configuration, arguments.default_);
}
case Instructions::call.value(): {
auto index = instruction.arguments().get<FunctionIndex>();
TRAP_IF_NOT(index.value() < configuration.frame().module().functions().size());
auto address = configuration.frame().module().functions()[index.value()];
dbgln_if(WASM_TRACE_DEBUG, "call({})", address.value());
call_address(configuration, address);
return;
}
case Instructions::call_indirect.value(): {
auto& args = instruction.arguments().get<Instruction::IndirectCallArgs>();
TRAP_IF_NOT(args.table.value() < configuration.frame().module().tables().size());
auto table_address = configuration.frame().module().tables()[args.table.value()];
auto table_instance = configuration.store().get(table_address);
auto index = configuration.stack().pop().get<Value>().to<i32>();
TRAP_IF_NOT(index.has_value());
TRAP_IF_NOT(index.value() >= 0);
TRAP_IF_NOT(static_cast<size_t>(index.value()) < table_instance->elements().size());
auto element = table_instance->elements()[index.value()];
TRAP_IF_NOT(element.has_value());
TRAP_IF_NOT(element->ref().has<Reference::Func>());
auto address = element->ref().get<Reference::Func>().address;
dbgln_if(WASM_TRACE_DEBUG, "call_indirect({} -> {})", index.value(), address.value());
call_address(configuration, address);
return;
}
case Instructions::i32_load.value():
LOAD_AND_PUSH(i32, i32);
case Instructions::i64_load.value():
LOAD_AND_PUSH(i64, i64);
case Instructions::f32_load.value():
LOAD_AND_PUSH(float, float);
case Instructions::f64_load.value():
LOAD_AND_PUSH(double, double);
case Instructions::i32_load8_s.value():
LOAD_AND_PUSH(i8, i32);
case Instructions::i32_load8_u.value():
LOAD_AND_PUSH(u8, i32);
case Instructions::i32_load16_s.value():
LOAD_AND_PUSH(i16, i32);
case Instructions::i32_load16_u.value():
LOAD_AND_PUSH(u16, i32);
case Instructions::i64_load8_s.value():
LOAD_AND_PUSH(i8, i64);
case Instructions::i64_load8_u.value():
LOAD_AND_PUSH(u8, i64);
case Instructions::i64_load16_s.value():
LOAD_AND_PUSH(i16, i64);
case Instructions::i64_load16_u.value():
LOAD_AND_PUSH(u16, i64);
case Instructions::i64_load32_s.value():
LOAD_AND_PUSH(i32, i64);
case Instructions::i64_load32_u.value():
LOAD_AND_PUSH(u32, i64);
case Instructions::i32_store.value():
POP_AND_STORE(i32, i32);
case Instructions::i64_store.value():
POP_AND_STORE(i64, i64);
case Instructions::f32_store.value():
POP_AND_STORE(float, float);
case Instructions::f64_store.value():
POP_AND_STORE(double, double);
case Instructions::i32_store8.value():
POP_AND_STORE(i32, i8);
case Instructions::i32_store16.value():
POP_AND_STORE(i32, i16);
case Instructions::i64_store8.value():
POP_AND_STORE(i64, i8);
case Instructions::i64_store16.value():
POP_AND_STORE(i64, i16);
case Instructions::i64_store32.value():
POP_AND_STORE(i64, i32);
case Instructions::local_tee.value(): {
auto value = configuration.stack().peek().get<Value>();
auto local_index = instruction.arguments().get<LocalIndex>();
TRAP_IF_NOT(configuration.frame().locals().size() > local_index.value());
dbgln_if(WASM_TRACE_DEBUG, "stack:peek -> locals({})", local_index.value());
configuration.frame().locals()[local_index.value()] = move(value);
return;
}
case Instructions::global_get.value(): {
auto global_index = instruction.arguments().get<GlobalIndex>();
TRAP_IF_NOT(configuration.frame().module().globals().size() > global_index.value());
auto address = configuration.frame().module().globals()[global_index.value()];
dbgln_if(WASM_TRACE_DEBUG, "global({}) -> stack", address.value());
auto global = configuration.store().get(address);
configuration.stack().push(Value(global->value()));
return;
}
case Instructions::global_set.value(): {
auto global_index = instruction.arguments().get<GlobalIndex>();
TRAP_IF_NOT(configuration.frame().module().globals().size() > global_index.value());
auto address = configuration.frame().module().globals()[global_index.value()];
auto value = configuration.stack().pop().get<Value>();
dbgln_if(WASM_TRACE_DEBUG, "stack -> global({})", address.value());
auto global = configuration.store().get(address);
global->set_value(move(value));
return;
}
case Instructions::memory_size.value(): {
TRAP_IF_NOT(configuration.frame().module().memories().size() > 0);
auto address = configuration.frame().module().memories()[0];
auto instance = configuration.store().get(address);
auto pages = instance->size() / Constants::page_size;
dbgln_if(WASM_TRACE_DEBUG, "memory.size -> stack({})", pages);
configuration.stack().push(Value((i32)pages));
return;
}
case Instructions::memory_grow.value(): {
TRAP_IF_NOT(configuration.frame().module().memories().size() > 0);
auto address = configuration.frame().module().memories()[0];
auto instance = configuration.store().get(address);
i32 old_pages = instance->size() / Constants::page_size;
auto new_pages = configuration.stack().peek().get<Value>().to<i32>();
TRAP_IF_NOT(new_pages.has_value());
dbgln_if(WASM_TRACE_DEBUG, "memory.grow({}), previously {} pages...", *new_pages, old_pages);
if (instance->grow(new_pages.value() * Constants::page_size))
configuration.stack().peek() = Value((i32)old_pages);
else
configuration.stack().peek() = Value((i32)-1);
return;
}
case Instructions::table_get.value():
case Instructions::table_set.value():
goto unimplemented;
case Instructions::ref_null.value(): {
auto type = instruction.arguments().get<ValueType>();
TRAP_IF_NOT(type.is_reference());
configuration.stack().push(Value(Reference(Reference::Null { type })));
return;
};
case Instructions::ref_func.value(): {
auto index = instruction.arguments().get<FunctionIndex>().value();
auto& functions = configuration.frame().module().functions();
TRAP_IF_NOT(functions.size() > index);
auto address = functions[index];
configuration.stack().push(Value(ValueType(ValueType::FunctionReference), address.value()));
return;
}
case Instructions::ref_is_null.value(): {
auto top = configuration.stack().peek().get_pointer<Value>();
TRAP_IF_NOT(top);
TRAP_IF_NOT(top->type().is_reference());
auto is_null = top->to<Reference::Null>().has_value();
configuration.stack().peek() = Value(ValueType(ValueType::I32), static_cast<u64>(is_null ? 1 : 0));
return;
}
case Instructions::drop.value():
configuration.stack().pop();
return;
case Instructions::select.value():
case Instructions::select_typed.value(): {
// Note: The type seems to only be used for validation.
auto value = configuration.stack().pop().get<Value>().to<i32>();
TRAP_IF_NOT(value.has_value());
dbgln_if(WASM_TRACE_DEBUG, "select({})", value.value());
auto rhs = move(configuration.stack().pop().get<Value>());
auto lhs = move(configuration.stack().peek().get<Value>());
configuration.stack().peek() = value.value() != 0 ? move(lhs) : move(rhs);
return;
}
case Instructions::i32_eqz.value():
UNARY_NUMERIC_OPERATION(i32, 0 ==);
case Instructions::i32_eq.value():
BINARY_NUMERIC_OPERATION(i32, ==, i32);
case Instructions::i32_ne.value():
BINARY_NUMERIC_OPERATION(i32, !=, i32);
case Instructions::i32_lts.value():
BINARY_NUMERIC_OPERATION(i32, <, i32);
case Instructions::i32_ltu.value():
BINARY_NUMERIC_OPERATION(u32, <, i32);
case Instructions::i32_gts.value():
BINARY_NUMERIC_OPERATION(i32, >, i32);
case Instructions::i32_gtu.value():
BINARY_NUMERIC_OPERATION(u32, >, i32);
case Instructions::i32_les.value():
BINARY_NUMERIC_OPERATION(i32, <=, i32);
case Instructions::i32_leu.value():
BINARY_NUMERIC_OPERATION(u32, <=, i32);
case Instructions::i32_ges.value():
BINARY_NUMERIC_OPERATION(i32, >=, i32);
case Instructions::i32_geu.value():
BINARY_NUMERIC_OPERATION(u32, >=, i32);
case Instructions::i64_eqz.value():
UNARY_NUMERIC_OPERATION(i64, 0ull ==);
case Instructions::i64_eq.value():
BINARY_NUMERIC_OPERATION(i64, ==, i32);
case Instructions::i64_ne.value():
BINARY_NUMERIC_OPERATION(i64, !=, i32);
case Instructions::i64_lts.value():
BINARY_NUMERIC_OPERATION(i64, <, i32);
case Instructions::i64_ltu.value():
BINARY_NUMERIC_OPERATION(u64, <, i32);
case Instructions::i64_gts.value():
BINARY_NUMERIC_OPERATION(i64, >, i32);
case Instructions::i64_gtu.value():
BINARY_NUMERIC_OPERATION(u64, >, i32);
case Instructions::i64_les.value():
BINARY_NUMERIC_OPERATION(i64, <=, i32);
case Instructions::i64_leu.value():
BINARY_NUMERIC_OPERATION(u64, <=, i32);
case Instructions::i64_ges.value():
BINARY_NUMERIC_OPERATION(i64, >=, i32);
case Instructions::i64_geu.value():
BINARY_NUMERIC_OPERATION(u64, >=, i32);
case Instructions::f32_eq.value():
BINARY_NUMERIC_OPERATION(float, ==, i32);
case Instructions::f32_ne.value():
BINARY_NUMERIC_OPERATION(float, !=, i32);
case Instructions::f32_lt.value():
BINARY_NUMERIC_OPERATION(float, <, i32);
case Instructions::f32_gt.value():
BINARY_NUMERIC_OPERATION(float, >, i32);
case Instructions::f32_le.value():
BINARY_NUMERIC_OPERATION(float, <=, i32);
case Instructions::f32_ge.value():
BINARY_NUMERIC_OPERATION(float, >=, i32);
case Instructions::f64_eq.value():
BINARY_NUMERIC_OPERATION(double, ==, i32);
case Instructions::f64_ne.value():
BINARY_NUMERIC_OPERATION(double, !=, i32);
case Instructions::f64_lt.value():
BINARY_NUMERIC_OPERATION(double, <, i32);
case Instructions::f64_gt.value():
BINARY_NUMERIC_OPERATION(double, >, i32);
case Instructions::f64_le.value():
BINARY_NUMERIC_OPERATION(double, <=, i32);
case Instructions::f64_ge.value():
BINARY_NUMERIC_OPERATION(double, >, i32);
case Instructions::i32_clz.value():
UNARY_NUMERIC_OPERATION(i32, clz);
case Instructions::i32_ctz.value():
UNARY_NUMERIC_OPERATION(i32, ctz);
case Instructions::i32_popcnt.value():
UNARY_NUMERIC_OPERATION(i32, __builtin_popcount);
case Instructions::i32_add.value():
BINARY_NUMERIC_OPERATION(i32, +, i32);
case Instructions::i32_sub.value():
BINARY_NUMERIC_OPERATION(i32, -, i32);
case Instructions::i32_mul.value():
BINARY_NUMERIC_OPERATION(i32, *, i32);
case Instructions::i32_divs.value():
BINARY_NUMERIC_OPERATION(i32, /, i32, TRAP_IF_NOT(!(Checked<i32>(lhs.value()) /= rhs.value()).has_overflow()));
case Instructions::i32_divu.value():
BINARY_NUMERIC_OPERATION(u32, /, i32, TRAP_IF_NOT(rhs.value() != 0));
case Instructions::i32_rems.value():
BINARY_NUMERIC_OPERATION(i32, %, i32, TRAP_IF_NOT(!(Checked<i32>(lhs.value()) /= rhs.value()).has_overflow()));
case Instructions::i32_remu.value():
BINARY_NUMERIC_OPERATION(u32, %, i32, TRAP_IF_NOT(rhs.value() != 0));
case Instructions::i32_and.value():
BINARY_NUMERIC_OPERATION(i32, &, i32);
case Instructions::i32_or.value():
BINARY_NUMERIC_OPERATION(i32, |, i32);
case Instructions::i32_xor.value():
BINARY_NUMERIC_OPERATION(i32, ^, i32);
case Instructions::i32_shl.value():
BINARY_NUMERIC_OPERATION(i32, <<, i32);
case Instructions::i32_shrs.value():
BINARY_NUMERIC_OPERATION(i32, >>, i32);
case Instructions::i32_shru.value():
BINARY_NUMERIC_OPERATION(u32, >>, i32);
case Instructions::i32_rotl.value():
BINARY_PREFIX_NUMERIC_OPERATION(u32, rotl, i32);
case Instructions::i32_rotr.value():
BINARY_PREFIX_NUMERIC_OPERATION(u32, rotr, i32);
case Instructions::i64_clz.value():
UNARY_NUMERIC_OPERATION(i64, clz);
case Instructions::i64_ctz.value():
UNARY_NUMERIC_OPERATION(i64, ctz);
case Instructions::i64_popcnt.value():
UNARY_NUMERIC_OPERATION(i64, __builtin_popcountll);
case Instructions::i64_add.value():
OVF_CHECKED_BINARY_NUMERIC_OPERATION(i64, +, i64);
case Instructions::i64_sub.value():
OVF_CHECKED_BINARY_NUMERIC_OPERATION(i64, -, i64);
case Instructions::i64_mul.value():
OVF_CHECKED_BINARY_NUMERIC_OPERATION(i64, *, i64);
case Instructions::i64_divs.value():
OVF_CHECKED_BINARY_NUMERIC_OPERATION(i64, /, i64, TRAP_IF_NOT(rhs.value() != 0));
case Instructions::i64_divu.value():
OVF_CHECKED_BINARY_NUMERIC_OPERATION(u64, /, i64, TRAP_IF_NOT(rhs.value() != 0));
case Instructions::i64_rems.value():
BINARY_NUMERIC_OPERATION(i64, %, i64, TRAP_IF_NOT(!(Checked<i32>(lhs.value()) /= rhs.value()).has_overflow()));
case Instructions::i64_remu.value():
BINARY_NUMERIC_OPERATION(u64, %, i64, TRAP_IF_NOT(rhs.value() != 0));
case Instructions::i64_and.value():
BINARY_NUMERIC_OPERATION(i64, &, i64);
case Instructions::i64_or.value():
BINARY_NUMERIC_OPERATION(i64, |, i64);
case Instructions::i64_xor.value():
BINARY_NUMERIC_OPERATION(i64, ^, i64);
case Instructions::i64_shl.value():
BINARY_NUMERIC_OPERATION(i64, <<, i64);
case Instructions::i64_shrs.value():
BINARY_NUMERIC_OPERATION(i64, >>, i64);
case Instructions::i64_shru.value():
BINARY_NUMERIC_OPERATION(u64, >>, i64);
case Instructions::i64_rotl.value():
BINARY_PREFIX_NUMERIC_OPERATION(u64, rotl, i64);
case Instructions::i64_rotr.value():
BINARY_PREFIX_NUMERIC_OPERATION(u64, rotr, i64);
case Instructions::f32_abs.value():
UNARY_NUMERIC_OPERATION(float, fabsf);
case Instructions::f32_neg.value():
UNARY_NUMERIC_OPERATION(float, -);
case Instructions::f32_ceil.value():
UNARY_NUMERIC_OPERATION(float, ceilf);
case Instructions::f32_floor.value():
UNARY_NUMERIC_OPERATION(float, floorf);
case Instructions::f32_trunc.value():
UNARY_NUMERIC_OPERATION(float, truncf);
case Instructions::f32_nearest.value():
UNARY_NUMERIC_OPERATION(float, roundf);
case Instructions::f32_sqrt.value():
UNARY_NUMERIC_OPERATION(float, sqrtf);
case Instructions::f32_add.value():
BINARY_NUMERIC_OPERATION(float, +, float);
case Instructions::f32_sub.value():
BINARY_NUMERIC_OPERATION(float, -, float);
case Instructions::f32_mul.value():
BINARY_NUMERIC_OPERATION(float, *, float);
case Instructions::f32_div.value():
BINARY_NUMERIC_OPERATION(float, /, float);
case Instructions::f32_min.value():
BINARY_PREFIX_NUMERIC_OPERATION(float, min, float);
case Instructions::f32_max.value():
BINARY_PREFIX_NUMERIC_OPERATION(float, max, float);
case Instructions::f32_copysign.value():
BINARY_PREFIX_NUMERIC_OPERATION(float, copysignf, float);
case Instructions::f64_abs.value():
UNARY_NUMERIC_OPERATION(double, fabs);
case Instructions::f64_neg.value():
UNARY_NUMERIC_OPERATION(double, -);
case Instructions::f64_ceil.value():
UNARY_NUMERIC_OPERATION(double, ceil);
case Instructions::f64_floor.value():
UNARY_NUMERIC_OPERATION(double, floor);
case Instructions::f64_trunc.value():
UNARY_NUMERIC_OPERATION(double, trunc);
case Instructions::f64_nearest.value():
UNARY_NUMERIC_OPERATION(double, round);
case Instructions::f64_sqrt.value():
UNARY_NUMERIC_OPERATION(double, sqrt);
case Instructions::f64_add.value():
BINARY_NUMERIC_OPERATION(double, +, double);
case Instructions::f64_sub.value():
BINARY_NUMERIC_OPERATION(double, -, double);
case Instructions::f64_mul.value():
BINARY_NUMERIC_OPERATION(double, *, double);
case Instructions::f64_div.value():
BINARY_NUMERIC_OPERATION(double, /, double);
case Instructions::f64_min.value():
BINARY_PREFIX_NUMERIC_OPERATION(double, min, double);
case Instructions::f64_max.value():
BINARY_PREFIX_NUMERIC_OPERATION(double, max, double);
case Instructions::f64_copysign.value():
BINARY_PREFIX_NUMERIC_OPERATION(double, copysign, double);
case Instructions::i32_wrap_i64.value():
UNARY_MAP(i64, i32, i32);
case Instructions::i32_trunc_sf32.value(): {
auto fn = [this](auto& v) { return checked_signed_truncate<float, i32>(v); };
UNARY_MAP(float, fn, i32);
}
case Instructions::i32_trunc_uf32.value(): {
auto fn = [this](auto& value) { return checked_unsigned_truncate<float, i32>(value); };
UNARY_MAP(float, fn, i32);
}
case Instructions::i32_trunc_sf64.value(): {
auto fn = [this](auto& value) { return checked_signed_truncate<double, i32>(value); };
UNARY_MAP(double, fn, i32);
}
case Instructions::i32_trunc_uf64.value(): {
auto fn = [this](auto& value) { return checked_unsigned_truncate<double, i32>(value); };
UNARY_MAP(double, fn, i32);
}
case Instructions::i64_trunc_sf32.value(): {
auto fn = [this](auto& value) { return checked_signed_truncate<float, i64>(value); };
UNARY_MAP(float, fn, i64);
}
case Instructions::i64_trunc_uf32.value(): {
auto fn = [this](auto& value) { return checked_unsigned_truncate<float, i64>(value); };
UNARY_MAP(float, fn, i64);
}
case Instructions::i64_trunc_sf64.value(): {
auto fn = [this](auto& value) { return checked_signed_truncate<double, i64>(value); };
UNARY_MAP(double, fn, i64);
}
case Instructions::i64_trunc_uf64.value(): {
auto fn = [this](auto& value) { return checked_unsigned_truncate<double, i64>(value); };
UNARY_MAP(double, fn, i64);
}
case Instructions::i64_extend_si32.value():
UNARY_MAP(i32, i64, i64);
case Instructions::i64_extend_ui32.value():
UNARY_MAP(u32, i64, i64);
case Instructions::f32_convert_si32.value():
UNARY_MAP(i32, float, float);
case Instructions::f32_convert_ui32.value():
UNARY_MAP(u32, float, float);
case Instructions::f32_convert_si64.value():
UNARY_MAP(i64, float, float);
case Instructions::f32_convert_ui64.value():
UNARY_MAP(u32, float, float);
case Instructions::f32_demote_f64.value():
UNARY_MAP(double, float, float);
case Instructions::f64_convert_si32.value():
UNARY_MAP(i32, double, double);
case Instructions::f64_convert_ui32.value():
UNARY_MAP(u32, double, double);
case Instructions::f64_convert_si64.value():
UNARY_MAP(i64, double, double);
case Instructions::f64_convert_ui64.value():
UNARY_MAP(u64, double, double);
case Instructions::f64_promote_f32.value():
UNARY_MAP(float, double, double);
case Instructions::i32_reinterpret_f32.value():
UNARY_MAP(float, bit_cast<i32>, i32);
case Instructions::i64_reinterpret_f64.value():
UNARY_MAP(double, bit_cast<i64>, i64);
case Instructions::f32_reinterpret_i32.value():
UNARY_MAP(i32, bit_cast<float>, float);
case Instructions::f64_reinterpret_i64.value():
UNARY_MAP(i64, bit_cast<double>, double);
case Instructions::i32_trunc_sat_f32_s.value():
case Instructions::i32_trunc_sat_f32_u.value():
case Instructions::i32_trunc_sat_f64_s.value():
case Instructions::i32_trunc_sat_f64_u.value():
case Instructions::i64_trunc_sat_f32_s.value():
case Instructions::i64_trunc_sat_f32_u.value():
case Instructions::i64_trunc_sat_f64_s.value():
case Instructions::i64_trunc_sat_f64_u.value():
case Instructions::memory_init.value():
case Instructions::data_drop.value():
case Instructions::memory_copy.value():
case Instructions::memory_fill.value():
case Instructions::table_init.value():
case Instructions::elem_drop.value():
case Instructions::table_copy.value():
case Instructions::table_grow.value():
case Instructions::table_size.value():
case Instructions::table_fill.value():
case Instructions::i32_extend8_s.value():
case Instructions::i32_extend16_s.value():
case Instructions::i64_extend8_s.value():
case Instructions::i64_extend16_s.value():
case Instructions::i64_extend32_s.value():
default:
unimplemented:;
dbgln("Instruction '{}' not implemented", instruction_name(instruction.opcode()));
m_do_trap = true;
return;
}
}
void DebuggerBytecodeInterpreter::interpret(Configuration& configuration, InstructionPointer& ip, Instruction const& instruction)
{
if (pre_interpret_hook) {
auto result = pre_interpret_hook(configuration, ip, instruction);
if (!result) {
m_do_trap = true;
return;
}
}
ScopeGuard guard { [&] {
if (post_interpret_hook) {
auto result = post_interpret_hook(configuration, ip, instruction, *this);
if (!result) {
m_do_trap = true;
return;
}
}
} };
BytecodeInterpreter::interpret(configuration, ip, instruction);
}
}

70
Userland/Libraries/LibWasm/AbstractMachine/BytecodeInterpreter.h Normal file
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@ -0,0 +1,70 @@
/*
* Copyright (c) 2021, Ali Mohammad Pur <mpfard@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibWasm/AbstractMachine/Configuration.h>
#include <LibWasm/AbstractMachine/Interpreter.h>
namespace Wasm {
struct BytecodeInterpreter : public Interpreter {
virtual void interpret(Configuration&) override;
virtual ~BytecodeInterpreter() override = default;
virtual bool did_trap() const override { return m_do_trap; }
virtual void clear_trap() override { m_do_trap = false; }
struct CallFrameHandle {
explicit CallFrameHandle(BytecodeInterpreter& interpreter, Configuration& configuration)
: m_configuration_handle(configuration)
, m_interpreter(interpreter)
{
}
~CallFrameHandle() = default;
Configuration::CallFrameHandle m_configuration_handle;
BytecodeInterpreter& m_interpreter;
};
protected:
virtual void interpret(Configuration&, InstructionPointer&, Instruction const&);
void branch_to_label(Configuration&, LabelIndex);
template<typename ReadT, typename PushT>
void load_and_push(Configuration&, Instruction const&);
void store_to_memory(Configuration&, Instruction const&, ReadonlyBytes data);
void call_address(Configuration&, FunctionAddress);
template<typename V, typename T>
MakeUnsigned<T> checked_unsigned_truncate(V);
template<typename V, typename T>
MakeSigned<T> checked_signed_truncate(V);
template<typename T>
T read_value(ReadonlyBytes data);
Vector<Value> pop_values(Configuration& configuration, size_t count);
bool trap_if_not(bool value)
{
if (!value)
m_do_trap = true;
return m_do_trap;
}
bool m_do_trap { false };
};
struct DebuggerBytecodeInterpreter : public BytecodeInterpreter {
virtual ~DebuggerBytecodeInterpreter() override = default;
Function<bool(Configuration&, InstructionPointer&, Instruction const&)> pre_interpret_hook;
Function<bool(Configuration&, InstructionPointer&, Instruction const&, Interpreter const&)> post_interpret_hook;
private:
virtual void interpret(Configuration&, InstructionPointer&, Instruction const&) override;
};
}

990
Userland/Libraries/LibWasm/AbstractMachine/Interpreter.cpp
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@ -4,996 +4,6 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Debug.h>
#include <LibWasm/AbstractMachine/AbstractMachine.h>
#include <LibWasm/AbstractMachine/Configuration.h>
#include <LibWasm/AbstractMachine/Interpreter.h>
#include <LibWasm/Opcode.h>
#include <LibWasm/Printer/Printer.h>
#include <limits.h>
#include <math.h>
namespace Wasm {
#define TRAP_IF_NOT(x) \
do { \
if (trap_if_not(x)) { \
dbgln_if(WASM_TRACE_DEBUG, "Trapped because {} failed, at line {}", #x, __LINE__); \
return; \
} \
} while (false)
#define TRAP_IF_NOT_NORETURN(x) \
do { \
if (trap_if_not(x)) { \
dbgln_if(WASM_TRACE_DEBUG, "Trapped because {} failed, at line {}", #x, __LINE__); \
} \
} while (false)
void BytecodeInterpreter::interpret(Configuration& configuration)
{
m_do_trap = false;
auto& instructions = configuration.frame().expression().instructions();
auto max_ip_value = InstructionPointer { instructions.size() };
auto& current_ip_value = configuration.ip();
while (current_ip_value < max_ip_value) {
auto& instruction = instructions[current_ip_value.value()];
auto old_ip = current_ip_value;
interpret(configuration, current_ip_value, instruction);
if (m_do_trap)
return;
if (current_ip_value == old_ip) // If no jump occurred
++current_ip_value;
}
}
void BytecodeInterpreter::branch_to_label(Configuration& configuration, LabelIndex index)
{
dbgln_if(WASM_TRACE_DEBUG, "Branch to label with index {}...", index.value());
auto label = configuration.nth_label(index.value());
TRAP_IF_NOT(label.has_value());
dbgln_if(WASM_TRACE_DEBUG, "...which is actually IP {}, and has {} result(s)", label->continuation().value(), label->arity());
auto results = pop_values(configuration, label->arity());
size_t drop_count = index.value() + 1;
for (; !configuration.stack().is_empty();) {
auto& entry = configuration.stack().peek();
if (entry.has<Label>()) {
if (--drop_count == 0)
break;
}
configuration.stack().pop();
}
for (auto& result : results)
configuration.stack().push(move(result));
configuration.ip() = label->continuation();
}
template<typename ReadType, typename PushType>
void BytecodeInterpreter::load_and_push(Configuration& configuration, Instruction const& instruction)
{
auto& address = configuration.frame().module().memories().first();
auto memory = configuration.store().get(address);
if (!memory) {
m_do_trap = true;
return;
}
auto& arg = instruction.arguments().get<Instruction::MemoryArgument>();
auto base = configuration.stack().peek().get<Value>().to<i32>();
if (!base.has_value()) {
m_do_trap = true;
return;
}
auto instance_address = base.value() + static_cast<i64>(arg.offset);
if (instance_address < 0 || static_cast<u64>(instance_address + sizeof(ReadType)) > memory->size()) {
m_do_trap = true;
dbgln("LibWasm: Memory access out of bounds (expected 0 <= {} and {} <= {})", instance_address, instance_address + sizeof(ReadType), memory->size());
return;
}
dbgln_if(WASM_TRACE_DEBUG, "load({} : {}) -> stack", instance_address, sizeof(ReadType));
auto slice = memory->data().bytes().slice(instance_address, sizeof(ReadType));
configuration.stack().peek() = Value(static_cast<PushType>(read_value<ReadType>(slice)));
}
void BytecodeInterpreter::store_to_memory(Configuration& configuration, Instruction const& instruction, ReadonlyBytes data)
{
auto& address = configuration.frame().module().memories().first();
auto memory = configuration.store().get(address);
TRAP_IF_NOT(memory);
auto& arg = instruction.arguments().get<Instruction::MemoryArgument>();
auto base = configuration.stack().pop().get<Value>().to<i32>();
TRAP_IF_NOT(base.has_value());
auto instance_address = base.value() + static_cast<i64>(arg.offset);
if (instance_address < 0 || static_cast<u64>(instance_address + data.size()) > memory->size()) {
m_do_trap = true;
dbgln("LibWasm: Memory access out of bounds (expected 0 <= {} and {} <= {})", instance_address, instance_address + data.size(), memory->size());
return;
}
dbgln_if(WASM_TRACE_DEBUG, "tempoaray({}b) -> store({})", data.size(), instance_address);
data.copy_to(memory->data().bytes().slice(instance_address, data.size()));
}
void BytecodeInterpreter::call_address(Configuration& configuration, FunctionAddress address)
{
auto instance = configuration.store().get(address);
TRAP_IF_NOT(instance);
FunctionType const* type { nullptr };
instance->visit([&](auto const& function) { type = &function.type(); });
TRAP_IF_NOT(type);
TRAP_IF_NOT(configuration.stack().entries().size() > type->parameters().size());
Vector<Value> args;
args.ensure_capacity(type->parameters().size());
auto span = configuration.stack().entries().span().slice_from_end(type->parameters().size());
for (auto& entry : span) {
auto* ptr = entry.get_pointer<Value>();
TRAP_IF_NOT(ptr != nullptr);
args.unchecked_append(*ptr);
}
configuration.stack().entries().remove(configuration.stack().size() - span.size(), span.size());
Result result { Trap {} };
{
CallFrameHandle handle { *this, configuration };
result = configuration.call(*this, address, move(args));
}
if (result.is_trap()) {
m_do_trap = true;
return;
}
configuration.stack().entries().ensure_capacity(configuration.stack().size() + result.values().size());
for (auto& entry : result.values())
configuration.stack().entries().unchecked_append(move(entry));
}
#define BINARY_NUMERIC_OPERATION(type, operator, cast, ...) \
do { \
auto rhs = configuration.stack().pop().get<Value>().to<type>(); \
auto lhs = configuration.stack().peek().get<Value>().to<type>(); \
TRAP_IF_NOT(lhs.has_value()); \
TRAP_IF_NOT(rhs.has_value()); \
__VA_ARGS__; \
auto result = lhs.value() operator rhs.value(); \
dbgln_if(WASM_TRACE_DEBUG, "{} {} {} = {}", lhs.value(), #operator, rhs.value(), result); \
configuration.stack().peek() = Value(cast(result)); \
return; \
} while (false)
#define OVF_CHECKED_BINARY_NUMERIC_OPERATION(type, operator, cast, ...) \
do { \
auto rhs = configuration.stack().pop().get<Value>().to<type>(); \
auto ulhs = configuration.stack().peek().get<Value>().to<type>(); \
TRAP_IF_NOT(ulhs.has_value()); \
TRAP_IF_NOT(rhs.has_value()); \
dbgln_if(WASM_TRACE_DEBUG, "{} {} {} = ??", ulhs.value(), #operator, rhs.value()); \
__VA_ARGS__; \
Checked lhs = ulhs.value(); \
lhs operator##= rhs.value(); \
TRAP_IF_NOT(!lhs.has_overflow()); \
auto result = lhs.value(); \
dbgln_if(WASM_TRACE_DEBUG, "{} {} {} = {}", ulhs.value(), #operator, rhs.value(), result); \
configuration.stack().peek() = Value(cast(result)); \
return; \
} while (false)
#define BINARY_PREFIX_NUMERIC_OPERATION(type, operation, cast, ...) \
do { \
auto rhs = configuration.stack().pop().get<Value>().to<type>(); \
auto lhs = configuration.stack().peek().get<Value>().to<type>(); \
TRAP_IF_NOT(lhs.has_value()); \
TRAP_IF_NOT(rhs.has_value()); \
auto result = operation(lhs.value(), rhs.value()); \
dbgln_if(WASM_TRACE_DEBUG, "{}({} {}) = {}", #operation, lhs.value(), rhs.value(), result); \
configuration.stack().peek() = Value(cast(result)); \
return; \
} while (false)
#define UNARY_MAP(pop_type, operation, ...) \
do { \
auto value = configuration.stack().peek().get<Value>().to<pop_type>(); \
TRAP_IF_NOT(value.has_value()); \
auto result = operation(value.value()); \
dbgln_if(WASM_TRACE_DEBUG, "map({}) {} = {}", #operation, value.value(), result); \
configuration.stack().peek() = Value(__VA_ARGS__(result)); \
return; \
} while (false)
#define UNARY_NUMERIC_OPERATION(type, operation) \
UNARY_MAP(type, operation, type)
#define LOAD_AND_PUSH(read_type, push_type) \
do { \
return load_and_push<read_type, push_type>(configuration, instruction); \
} while (false)
#define POP_AND_STORE(pop_type, store_type) \
do { \
auto value = ConvertToRaw<store_type> {}(*configuration.stack().pop().get<Value>().to<pop_type>()); \
dbgln_if(WASM_TRACE_DEBUG, "stack({}) -> temporary({}b)", value, sizeof(store_type)); \
store_to_memory(configuration, instruction, { &value, sizeof(store_type) }); \
return; \
} while (false)
template<typename T>
T BytecodeInterpreter::read_value(ReadonlyBytes data)
{
LittleEndian<T> value;
InputMemoryStream stream { data };
stream >> value;
if (stream.handle_any_error()) {
dbgln("Read from {} failed", data.data());
m_do_trap = true;
}
return value;
}
template<>
float BytecodeInterpreter::read_value<float>(ReadonlyBytes data)
{
InputMemoryStream stream { data };
LittleEndian<u32> raw_value;
stream >> raw_value;
if (stream.handle_any_error())
m_do_trap = true;
return bit_cast<float>(static_cast<u32>(raw_value));
}
template<>
double BytecodeInterpreter::read_value<double>(ReadonlyBytes data)
{
InputMemoryStream stream { data };
LittleEndian<u64> raw_value;
stream >> raw_value;
if (stream.handle_any_error())
m_do_trap = true;
return bit_cast<double>(static_cast<u64>(raw_value));
}
template<typename T>
struct ConvertToRaw {
T operator()(T value)
{
return LittleEndian<T>(value);
}
};
template<>
struct ConvertToRaw<float> {
u32 operator()(float value)
{
LittleEndian<u32> res;
ReadonlyBytes bytes { &value, sizeof(float) };
InputMemoryStream stream { bytes };
stream >> res;
VERIFY(!stream.has_any_error());
return static_cast<u32>(res);
}
};
template<>
struct ConvertToRaw<double> {
u64 operator()(double value)
{
LittleEndian<u64> res;
ReadonlyBytes bytes { &value, sizeof(double) };
InputMemoryStream stream { bytes };
stream >> res;
VERIFY(!stream.has_any_error());
return static_cast<u64>(res);
}
};
template<typename V, typename T>
MakeSigned<T> BytecodeInterpreter::checked_signed_truncate(V value)
{
if (isnan(value) || isinf(value)) { // "undefined", let's just trap.
m_do_trap = true;
return 0;
}
double truncated;
if constexpr (IsSame<float, V>)
truncated = truncf(value);
else
truncated = trunc(value);
using SignedT = MakeSigned<T>;
if (NumericLimits<SignedT>::min() <= truncated && static_cast<double>(NumericLimits<SignedT>::max()) >= truncated)
return static_cast<SignedT>(truncated);
dbgln_if(WASM_TRACE_DEBUG, "Truncate out of range error");
m_do_trap = true;
return true;
}
template<typename V, typename T>
MakeUnsigned<T> BytecodeInterpreter::checked_unsigned_truncate(V value)
{
if (isnan(value) || isinf(value)) { // "undefined", let's just trap.
m_do_trap = true;
return 0;
}
double truncated;
if constexpr (IsSame<float, V>)
truncated = truncf(value);
else
truncated = trunc(value);
using UnsignedT = MakeUnsigned<T>;
if (NumericLimits<UnsignedT>::min() <= truncated && static_cast<double>(NumericLimits<UnsignedT>::max()) >= truncated)
return static_cast<UnsignedT>(truncated);
dbgln_if(WASM_TRACE_DEBUG, "Truncate out of range error");
m_do_trap = true;
return true;
}
Vector<Value> BytecodeInterpreter::pop_values(Configuration& configuration, size_t count)
{
Vector<Value> results;
results.resize(count);
for (size_t i = 0; i < count; ++i) {
auto top_of_stack = configuration.stack().pop();
if (auto value = top_of_stack.get_pointer<Value>())
results[i] = move(*value);
else
TRAP_IF_NOT_NORETURN(value);
}
return results;
}
template<typename T, typename R>
ALWAYS_INLINE static T rotl(T value, R shift)
{
// generates a single 'rol' instruction if shift is positive
// otherwise generate a `ror`
auto const mask = CHAR_BIT * sizeof(T) - 1;
shift &= mask;
return (value << shift) | (value >> ((-shift) & mask));
}
template<typename T, typename R>
ALWAYS_INLINE static T rotr(T value, R shift)
{
// generates a single 'ror' instruction if shift is positive
// otherwise generate a `rol`
auto const mask = CHAR_BIT * sizeof(T) - 1;
shift &= mask;
return (value >> shift) | (value << ((-shift) & mask));
}
template<typename T>
ALWAYS_INLINE static i32 clz(T value)
{
if (value == 0)
return sizeof(T) * CHAR_BIT;
if constexpr (sizeof(T) == 4)
return __builtin_clz(value);
else if constexpr (sizeof(T) == 8)
return __builtin_clzll(value);
else
VERIFY_NOT_REACHED();
}
template<typename T>
ALWAYS_INLINE static i32 ctz(T value)
{
if (value == 0)
return sizeof(T) * CHAR_BIT;
if constexpr (sizeof(T) == 4)
return __builtin_ctz(value);
else if constexpr (sizeof(T) == 8)
return __builtin_ctzll(value);
else
VERIFY_NOT_REACHED();
}
void BytecodeInterpreter::interpret(Configuration& configuration, InstructionPointer& ip, Instruction const& instruction)
{
dbgln_if(WASM_TRACE_DEBUG, "Executing instruction {} at ip {}", instruction_name(instruction.opcode()), ip.value());
switch (instruction.opcode().value()) {
case Instructions::unreachable.value():
m_do_trap = true;
return;
case Instructions::nop.value():
return;
case Instructions::local_get.value():
configuration.stack().push(Value(configuration.frame().locals()[instruction.arguments().get<LocalIndex>().value()]));
return;
case Instructions::local_set.value(): {
auto entry = configuration.stack().pop();
configuration.frame().locals()[instruction.arguments().get<LocalIndex>().value()] = move(entry.get<Value>());
return;
}
case Instructions::i32_const.value():
configuration.stack().push(Value(ValueType { ValueType::I32 }, static_cast<i64>(instruction.arguments().get<i32>())));
return;
case Instructions::i64_const.value():
configuration.stack().push(Value(ValueType { ValueType::I64 }, instruction.arguments().get<i64>()));
return;
case Instructions::f32_const.value():
configuration.stack().push(Value(ValueType { ValueType::F32 }, static_cast<double>(instruction.arguments().get<float>())));
return;
case Instructions::f64_const.value():
configuration.stack().push(Value(ValueType { ValueType::F64 }, instruction.arguments().get<double>()));
return;
case Instructions::block.value(): {
size_t arity = 0;
auto& args = instruction.arguments().get<Instruction::StructuredInstructionArgs>();
if (args.block_type.kind() != BlockType::Empty)
arity = 1;
configuration.stack().push(Label(arity, args.end_ip));
return;
}
case Instructions::loop.value(): {
size_t arity = 0;
auto& args = instruction.arguments().get<Instruction::StructuredInstructionArgs>();
if (args.block_type.kind() != BlockType::Empty)
arity = 1;
configuration.stack().push(Label(arity, ip.value() + 1));
return;
}
case Instructions::if_.value(): {
size_t arity = 0;
auto& args = instruction.arguments().get<Instruction::StructuredInstructionArgs>();
if (args.block_type.kind() != BlockType::Empty)
arity = 1;
auto entry = configuration.stack().pop();
auto value = entry.get<Value>().to<i32>();
TRAP_IF_NOT(value.has_value());
auto end_label = Label(arity, args.end_ip.value());
if (value.value() == 0) {
if (args.else_ip.has_value()) {
configuration.ip() = args.else_ip.value();
configuration.stack().push(move(end_label));
} else {
configuration.ip() = args.end_ip.value() + 1;
}
} else {
configuration.stack().push(move(end_label));
}
return;
}
case Instructions::structured_end.value():
case Instructions::structured_else.value(): {
auto label = configuration.nth_label(0);
TRAP_IF_NOT(label.has_value());
size_t end = configuration.stack().size() - label->arity() - 1;
size_t start = end;
while (start > 0 && start < configuration.stack().size() && !configuration.stack().entries()[start].has<Label>())
--start;
configuration.stack().entries().remove(start, end - start + 1);
if (instruction.opcode() == Instructions::structured_end)
return;
// Jump to the end label
configuration.ip() = label->continuation();
return;
}
case Instructions::return_.value(): {
auto& frame = configuration.frame();
size_t end = configuration.stack().size() - frame.arity();
size_t start = end;
for (; start + 1 > 0 && start < configuration.stack().size(); --start) {
auto& entry = configuration.stack().entries()[start];
if (entry.has<Frame>()) {
// Leave the frame, _and_ its label.
start += 2;
break;
}
}
configuration.stack().entries().remove(start, end - start);
// Jump past the call/indirect instruction
configuration.ip() = configuration.frame().expression().instructions().size();
return;
}
case Instructions::br.value():
return branch_to_label(configuration, instruction.arguments().get<LabelIndex>());
case Instructions::br_if.value(): {
if (configuration.stack().pop().get<Value>().to<i32>().value_or(0) == 0)
return;
return branch_to_label(configuration, instruction.arguments().get<LabelIndex>());
}
case Instructions::br_table.value(): {
auto& arguments = instruction.arguments().get<Instruction::TableBranchArgs>();
auto entry = configuration.stack().pop();
TRAP_IF_NOT(entry.has<Value>());
auto maybe_i = entry.get<Value>().to<i32>();
TRAP_IF_NOT(maybe_i.has_value());
TRAP_IF_NOT(maybe_i.value() >= 0);
size_t i = *maybe_i;
if (i < arguments.labels.size())
return branch_to_label(configuration, arguments.labels[i]);
return branch_to_label(configuration, arguments.default_);
}
case Instructions::call.value(): {
auto index = instruction.arguments().get<FunctionIndex>();
TRAP_IF_NOT(index.value() < configuration.frame().module().functions().size());
auto address = configuration.frame().module().functions()[index.value()];
dbgln_if(WASM_TRACE_DEBUG, "call({})", address.value());
call_address(configuration, address);
return;
}
case Instructions::call_indirect.value(): {
auto& args = instruction.arguments().get<Instruction::IndirectCallArgs>();
TRAP_IF_NOT(args.table.value() < configuration.frame().module().tables().size());
auto table_address = configuration.frame().module().tables()[args.table.value()];
auto table_instance = configuration.store().get(table_address);
auto index = configuration.stack().pop().get<Value>().to<i32>();
TRAP_IF_NOT(index.has_value());
TRAP_IF_NOT(index.value() >= 0);
TRAP_IF_NOT(static_cast<size_t>(index.value()) < table_instance->elements().size());
auto element = table_instance->elements()[index.value()];
TRAP_IF_NOT(element.has_value());
TRAP_IF_NOT(element->ref().has<Reference::Func>());
auto address = element->ref().get<Reference::Func>().address;
dbgln_if(WASM_TRACE_DEBUG, "call_indirect({} -> {})", index.value(), address.value());
call_address(configuration, address);
return;
}
case Instructions::i32_load.value():
LOAD_AND_PUSH(i32, i32);
case Instructions::i64_load.value():
LOAD_AND_PUSH(i64, i64);
case Instructions::f32_load.value():
LOAD_AND_PUSH(float, float);
case Instructions::f64_load.value():
LOAD_AND_PUSH(double, double);
case Instructions::i32_load8_s.value():
LOAD_AND_PUSH(i8, i32);
case Instructions::i32_load8_u.value():
LOAD_AND_PUSH(u8, i32);
case Instructions::i32_load16_s.value():
LOAD_AND_PUSH(i16, i32);
case Instructions::i32_load16_u.value():
LOAD_AND_PUSH(u16, i32);
case Instructions::i64_load8_s.value():
LOAD_AND_PUSH(i8, i64);
case Instructions::i64_load8_u.value():
LOAD_AND_PUSH(u8, i64);
case Instructions::i64_load16_s.value():
LOAD_AND_PUSH(i16, i64);
case Instructions::i64_load16_u.value():
LOAD_AND_PUSH(u16, i64);
case Instructions::i64_load32_s.value():
LOAD_AND_PUSH(i32, i64);
case Instructions::i64_load32_u.value():
LOAD_AND_PUSH(u32, i64);
case Instructions::i32_store.value():
POP_AND_STORE(i32, i32);
case Instructions::i64_store.value():
POP_AND_STORE(i64, i64);
case Instructions::f32_store.value():
POP_AND_STORE(float, float);
case Instructions::f64_store.value():
POP_AND_STORE(double, double);
case Instructions::i32_store8.value():
POP_AND_STORE(i32, i8);
case Instructions::i32_store16.value():
POP_AND_STORE(i32, i16);
case Instructions::i64_store8.value():
POP_AND_STORE(i64, i8);
case Instructions::i64_store16.value():
POP_AND_STORE(i64, i16);
case Instructions::i64_store32.value():
POP_AND_STORE(i64, i32);
case Instructions::local_tee.value(): {
auto value = configuration.stack().peek().get<Value>();
auto local_index = instruction.arguments().get<LocalIndex>();
TRAP_IF_NOT(configuration.frame().locals().size() > local_index.value());
dbgln_if(WASM_TRACE_DEBUG, "stack:peek -> locals({})", local_index.value());
configuration.frame().locals()[local_index.value()] = move(value);
return;
}
case Instructions::global_get.value(): {
auto global_index = instruction.arguments().get<GlobalIndex>();
TRAP_IF_NOT(configuration.frame().module().globals().size() > global_index.value());
auto address = configuration.frame().module().globals()[global_index.value()];
dbgln_if(WASM_TRACE_DEBUG, "global({}) -> stack", address.value());
auto global = configuration.store().get(address);
configuration.stack().push(Value(global->value()));
return;
}
case Instructions::global_set.value(): {
auto global_index = instruction.arguments().get<GlobalIndex>();
TRAP_IF_NOT(configuration.frame().module().globals().size() > global_index.value());
auto address = configuration.frame().module().globals()[global_index.value()];
auto value = configuration.stack().pop().get<Value>();
dbgln_if(WASM_TRACE_DEBUG, "stack -> global({})", address.value());
auto global = configuration.store().get(address);
global->set_value(move(value));
return;
}
case Instructions::memory_size.value(): {
TRAP_IF_NOT(configuration.frame().module().memories().size() > 0);
auto address = configuration.frame().module().memories()[0];
auto instance = configuration.store().get(address);
auto pages = instance->size() / Constants::page_size;
dbgln_if(WASM_TRACE_DEBUG, "memory.size -> stack({})", pages);
configuration.stack().push(Value((i32)pages));
return;
}
case Instructions::memory_grow.value(): {
TRAP_IF_NOT(configuration.frame().module().memories().size() > 0);
auto address = configuration.frame().module().memories()[0];
auto instance = configuration.store().get(address);
i32 old_pages = instance->size() / Constants::page_size;
auto new_pages = configuration.stack().peek().get<Value>().to<i32>();
TRAP_IF_NOT(new_pages.has_value());
dbgln_if(WASM_TRACE_DEBUG, "memory.grow({}), previously {} pages...", *new_pages, old_pages);
if (instance->grow(new_pages.value() * Constants::page_size))
configuration.stack().peek() = Value((i32)old_pages);
else
configuration.stack().peek() = Value((i32)-1);
return;
}
case Instructions::table_get.value():
case Instructions::table_set.value():
goto unimplemented;
case Instructions::ref_null.value(): {
auto type = instruction.arguments().get<ValueType>();
TRAP_IF_NOT(type.is_reference());
configuration.stack().push(Value(Reference(Reference::Null { type })));
return;
};
case Instructions::ref_func.value(): {
auto index = instruction.arguments().get<FunctionIndex>().value();
auto& functions = configuration.frame().module().functions();
TRAP_IF_NOT(functions.size() > index);
auto address = functions[index];
configuration.stack().push(Value(ValueType(ValueType::FunctionReference), address.value()));
return;
}
case Instructions::ref_is_null.value(): {
auto top = configuration.stack().peek().get_pointer<Value>();
TRAP_IF_NOT(top);
TRAP_IF_NOT(top->type().is_reference());
auto is_null = top->to<Reference::Null>().has_value();
configuration.stack().peek() = Value(ValueType(ValueType::I32), static_cast<u64>(is_null ? 1 : 0));
return;
}
case Instructions::drop.value():
configuration.stack().pop();
return;
case Instructions::select.value():
case Instructions::select_typed.value(): {
// Note: The type seems to only be used for validation.
auto value = configuration.stack().pop().get<Value>().to<i32>();
TRAP_IF_NOT(value.has_value());
dbgln_if(WASM_TRACE_DEBUG, "select({})", value.value());
auto rhs = move(configuration.stack().pop().get<Value>());
auto lhs = move(configuration.stack().peek().get<Value>());
configuration.stack().peek() = value.value() != 0 ? move(lhs) : move(rhs);
return;
}
case Instructions::i32_eqz.value():
UNARY_NUMERIC_OPERATION(i32, 0 ==);
case Instructions::i32_eq.value():
BINARY_NUMERIC_OPERATION(i32, ==, i32);
case Instructions::i32_ne.value():
BINARY_NUMERIC_OPERATION(i32, !=, i32);
case Instructions::i32_lts.value():
BINARY_NUMERIC_OPERATION(i32, <, i32);
case Instructions::i32_ltu.value():
BINARY_NUMERIC_OPERATION(u32, <, i32);
case Instructions::i32_gts.value():
BINARY_NUMERIC_OPERATION(i32, >, i32);
case Instructions::i32_gtu.value():
BINARY_NUMERIC_OPERATION(u32, >, i32);
case Instructions::i32_les.value():
BINARY_NUMERIC_OPERATION(i32, <=, i32);
case Instructions::i32_leu.value():
BINARY_NUMERIC_OPERATION(u32, <=, i32);
case Instructions::i32_ges.value():
BINARY_NUMERIC_OPERATION(i32, >=, i32);
case Instructions::i32_geu.value():
BINARY_NUMERIC_OPERATION(u32, >=, i32);
case Instructions::i64_eqz.value():
UNARY_NUMERIC_OPERATION(i64, 0ull ==);
case Instructions::i64_eq.value():
BINARY_NUMERIC_OPERATION(i64, ==, i32);
case Instructions::i64_ne.value():
BINARY_NUMERIC_OPERATION(i64, !=, i32);
case Instructions::i64_lts.value():
BINARY_NUMERIC_OPERATION(i64, <, i32);
case Instructions::i64_ltu.value():
BINARY_NUMERIC_OPERATION(u64, <, i32);
case Instructions::i64_gts.value():
BINARY_NUMERIC_OPERATION(i64, >, i32);
case Instructions::i64_gtu.value():
BINARY_NUMERIC_OPERATION(u64, >, i32);
case Instructions::i64_les.value():
BINARY_NUMERIC_OPERATION(i64, <=, i32);
case Instructions::i64_leu.value():
BINARY_NUMERIC_OPERATION(u64, <=, i32);
case Instructions::i64_ges.value():
BINARY_NUMERIC_OPERATION(i64, >=, i32);
case Instructions::i64_geu.value():
BINARY_NUMERIC_OPERATION(u64, >=, i32);
case Instructions::f32_eq.value():
BINARY_NUMERIC_OPERATION(float, ==, i32);
case Instructions::f32_ne.value():
BINARY_NUMERIC_OPERATION(float, !=, i32);
case Instructions::f32_lt.value():
BINARY_NUMERIC_OPERATION(float, <, i32);
case Instructions::f32_gt.value():
BINARY_NUMERIC_OPERATION(float, >, i32);
case Instructions::f32_le.value():
BINARY_NUMERIC_OPERATION(float, <=, i32);
case Instructions::f32_ge.value():
BINARY_NUMERIC_OPERATION(float, >=, i32);
case Instructions::f64_eq.value():
BINARY_NUMERIC_OPERATION(double, ==, i32);
case Instructions::f64_ne.value():
BINARY_NUMERIC_OPERATION(double, !=, i32);
case Instructions::f64_lt.value():
BINARY_NUMERIC_OPERATION(double, <, i32);
case Instructions::f64_gt.value():
BINARY_NUMERIC_OPERATION(double, >, i32);
case Instructions::f64_le.value():
BINARY_NUMERIC_OPERATION(double, <=, i32);
case Instructions::f64_ge.value():
BINARY_NUMERIC_OPERATION(double, >, i32);
case Instructions::i32_clz.value():
UNARY_NUMERIC_OPERATION(i32, clz);
case Instructions::i32_ctz.value():
UNARY_NUMERIC_OPERATION(i32, ctz);
case Instructions::i32_popcnt.value():
UNARY_NUMERIC_OPERATION(i32, __builtin_popcount);
case Instructions::i32_add.value():
BINARY_NUMERIC_OPERATION(i32, +, i32);
case Instructions::i32_sub.value():
BINARY_NUMERIC_OPERATION(i32, -, i32);
case Instructions::i32_mul.value():
BINARY_NUMERIC_OPERATION(i32, *, i32);
case Instructions::i32_divs.value():
BINARY_NUMERIC_OPERATION(i32, /, i32, TRAP_IF_NOT(!(Checked<i32>(lhs.value()) /= rhs.value()).has_overflow()));
case Instructions::i32_divu.value():
BINARY_NUMERIC_OPERATION(u32, /, i32, TRAP_IF_NOT(rhs.value() != 0));
case Instructions::i32_rems.value():
BINARY_NUMERIC_OPERATION(i32, %, i32, TRAP_IF_NOT(!(Checked<i32>(lhs.value()) /= rhs.value()).has_overflow()));
case Instructions::i32_remu.value():
BINARY_NUMERIC_OPERATION(u32, %, i32, TRAP_IF_NOT(rhs.value() != 0));
case Instructions::i32_and.value():
BINARY_NUMERIC_OPERATION(i32, &, i32);
case Instructions::i32_or.value():
BINARY_NUMERIC_OPERATION(i32, |, i32);
case Instructions::i32_xor.value():
BINARY_NUMERIC_OPERATION(i32, ^, i32);
case Instructions::i32_shl.value():
BINARY_NUMERIC_OPERATION(i32, <<, i32);
case Instructions::i32_shrs.value():
BINARY_NUMERIC_OPERATION(i32, >>, i32);
case Instructions::i32_shru.value():
BINARY_NUMERIC_OPERATION(u32, >>, i32);
case Instructions::i32_rotl.value():
BINARY_PREFIX_NUMERIC_OPERATION(u32, rotl, i32);
case Instructions::i32_rotr.value():
BINARY_PREFIX_NUMERIC_OPERATION(u32, rotr, i32);
case Instructions::i64_clz.value():
UNARY_NUMERIC_OPERATION(i64, clz);
case Instructions::i64_ctz.value():
UNARY_NUMERIC_OPERATION(i64, ctz);
case Instructions::i64_popcnt.value():
UNARY_NUMERIC_OPERATION(i64, __builtin_popcountll);
case Instructions::i64_add.value():
OVF_CHECKED_BINARY_NUMERIC_OPERATION(i64, +, i64);
case Instructions::i64_sub.value():
OVF_CHECKED_BINARY_NUMERIC_OPERATION(i64, -, i64);
case Instructions::i64_mul.value():
OVF_CHECKED_BINARY_NUMERIC_OPERATION(i64, *, i64);
case Instructions::i64_divs.value():
OVF_CHECKED_BINARY_NUMERIC_OPERATION(i64, /, i64, TRAP_IF_NOT(rhs.value() != 0));
case Instructions::i64_divu.value():
OVF_CHECKED_BINARY_NUMERIC_OPERATION(u64, /, i64, TRAP_IF_NOT(rhs.value() != 0));
case Instructions::i64_rems.value():
BINARY_NUMERIC_OPERATION(i64, %, i64, TRAP_IF_NOT(!(Checked<i32>(lhs.value()) /= rhs.value()).has_overflow()));
case Instructions::i64_remu.value():
BINARY_NUMERIC_OPERATION(u64, %, i64, TRAP_IF_NOT(rhs.value() != 0));
case Instructions::i64_and.value():
BINARY_NUMERIC_OPERATION(i64, &, i64);
case Instructions::i64_or.value():
BINARY_NUMERIC_OPERATION(i64, |, i64);
case Instructions::i64_xor.value():
BINARY_NUMERIC_OPERATION(i64, ^, i64);
case Instructions::i64_shl.value():
BINARY_NUMERIC_OPERATION(i64, <<, i64);
case Instructions::i64_shrs.value():
BINARY_NUMERIC_OPERATION(i64, >>, i64);
case Instructions::i64_shru.value():
BINARY_NUMERIC_OPERATION(u64, >>, i64);
case Instructions::i64_rotl.value():
BINARY_PREFIX_NUMERIC_OPERATION(u64, rotl, i64);
case Instructions::i64_rotr.value():
BINARY_PREFIX_NUMERIC_OPERATION(u64, rotr, i64);
case Instructions::f32_abs.value():
UNARY_NUMERIC_OPERATION(float, fabsf);
case Instructions::f32_neg.value():
UNARY_NUMERIC_OPERATION(float, -);
case Instructions::f32_ceil.value():
UNARY_NUMERIC_OPERATION(float, ceilf);
case Instructions::f32_floor.value():
UNARY_NUMERIC_OPERATION(float, floorf);
case Instructions::f32_trunc.value():
UNARY_NUMERIC_OPERATION(float, truncf);
case Instructions::f32_nearest.value():
UNARY_NUMERIC_OPERATION(float, roundf);
case Instructions::f32_sqrt.value():
UNARY_NUMERIC_OPERATION(float, sqrtf);
case Instructions::f32_add.value():
BINARY_NUMERIC_OPERATION(float, +, float);
case Instructions::f32_sub.value():
BINARY_NUMERIC_OPERATION(float, -, float);
case Instructions::f32_mul.value():
BINARY_NUMERIC_OPERATION(float, *, float);
case Instructions::f32_div.value():
BINARY_NUMERIC_OPERATION(float, /, float);
case Instructions::f32_min.value():
BINARY_PREFIX_NUMERIC_OPERATION(float, min, float);
case Instructions::f32_max.value():
BINARY_PREFIX_NUMERIC_OPERATION(float, max, float);
case Instructions::f32_copysign.value():
BINARY_PREFIX_NUMERIC_OPERATION(float, copysignf, float);
case Instructions::f64_abs.value():
UNARY_NUMERIC_OPERATION(double, fabs);
case Instructions::f64_neg.value():
UNARY_NUMERIC_OPERATION(double, -);
case Instructions::f64_ceil.value():
UNARY_NUMERIC_OPERATION(double, ceil);
case Instructions::f64_floor.value():
UNARY_NUMERIC_OPERATION(double, floor);
case Instructions::f64_trunc.value():
UNARY_NUMERIC_OPERATION(double, trunc);
case Instructions::f64_nearest.value():
UNARY_NUMERIC_OPERATION(double, round);
case Instructions::f64_sqrt.value():
UNARY_NUMERIC_OPERATION(double, sqrt);
case Instructions::f64_add.value():
BINARY_NUMERIC_OPERATION(double, +, double);
case Instructions::f64_sub.value():
BINARY_NUMERIC_OPERATION(double, -, double);
case Instructions::f64_mul.value():
BINARY_NUMERIC_OPERATION(double, *, double);
case Instructions::f64_div.value():
BINARY_NUMERIC_OPERATION(double, /, double);
case Instructions::f64_min.value():
BINARY_PREFIX_NUMERIC_OPERATION(double, min, double);
case Instructions::f64_max.value():
BINARY_PREFIX_NUMERIC_OPERATION(double, max, double);
case Instructions::f64_copysign.value():
BINARY_PREFIX_NUMERIC_OPERATION(double, copysign, double);
case Instructions::i32_wrap_i64.value():
UNARY_MAP(i64, i32, i32);
case Instructions::i32_trunc_sf32.value(): {
auto fn = [this](auto& v) { return checked_signed_truncate<float, i32>(v); };
UNARY_MAP(float, fn, i32);
}
case Instructions::i32_trunc_uf32.value(): {
auto fn = [this](auto& value) { return checked_unsigned_truncate<float, i32>(value); };
UNARY_MAP(float, fn, i32);
}
case Instructions::i32_trunc_sf64.value(): {
auto fn = [this](auto& value) { return checked_signed_truncate<double, i32>(value); };
UNARY_MAP(double, fn, i32);
}
case Instructions::i32_trunc_uf64.value(): {
auto fn = [this](auto& value) { return checked_unsigned_truncate<double, i32>(value); };
UNARY_MAP(double, fn, i32);
}
case Instructions::i64_trunc_sf32.value(): {
auto fn = [this](auto& value) { return checked_signed_truncate<float, i64>(value); };
UNARY_MAP(float, fn, i64);
}
case Instructions::i64_trunc_uf32.value(): {
auto fn = [this](auto& value) { return checked_unsigned_truncate<float, i64>(value); };
UNARY_MAP(float, fn, i64);
}
case Instructions::i64_trunc_sf64.value(): {
auto fn = [this](auto& value) { return checked_signed_truncate<double, i64>(value); };
UNARY_MAP(double, fn, i64);
}
case Instructions::i64_trunc_uf64.value(): {
auto fn = [this](auto& value) { return checked_unsigned_truncate<double, i64>(value); };
UNARY_MAP(double, fn, i64);
}
case Instructions::i64_extend_si32.value():
UNARY_MAP(i32, i64, i64);
case Instructions::i64_extend_ui32.value():
UNARY_MAP(u32, i64, i64);
case Instructions::f32_convert_si32.value():
UNARY_MAP(i32, float, float);
case Instructions::f32_convert_ui32.value():
UNARY_MAP(u32, float, float);
case Instructions::f32_convert_si64.value():
UNARY_MAP(i64, float, float);
case Instructions::f32_convert_ui64.value():
UNARY_MAP(u32, float, float);
case Instructions::f32_demote_f64.value():
UNARY_MAP(double, float, float);
case Instructions::f64_convert_si32.value():
UNARY_MAP(i32, double, double);
case Instructions::f64_convert_ui32.value():
UNARY_MAP(u32, double, double);
case Instructions::f64_convert_si64.value():
UNARY_MAP(i64, double, double);
case Instructions::f64_convert_ui64.value():
UNARY_MAP(u64, double, double);
case Instructions::f64_promote_f32.value():
UNARY_MAP(float, double, double);
case Instructions::i32_reinterpret_f32.value():
UNARY_MAP(float, bit_cast<i32>, i32);
case Instructions::i64_reinterpret_f64.value():
UNARY_MAP(double, bit_cast<i64>, i64);
case Instructions::f32_reinterpret_i32.value():
UNARY_MAP(i32, bit_cast<float>, float);
case Instructions::f64_reinterpret_i64.value():
UNARY_MAP(i64, bit_cast<double>, double);
case Instructions::i32_trunc_sat_f32_s.value():
case Instructions::i32_trunc_sat_f32_u.value():
case Instructions::i32_trunc_sat_f64_s.value():
case Instructions::i32_trunc_sat_f64_u.value():
case Instructions::i64_trunc_sat_f32_s.value():
case Instructions::i64_trunc_sat_f32_u.value():
case Instructions::i64_trunc_sat_f64_s.value():
case Instructions::i64_trunc_sat_f64_u.value():
case Instructions::memory_init.value():
case Instructions::data_drop.value():
case Instructions::memory_copy.value():
case Instructions::memory_fill.value():
case Instructions::table_init.value():
case Instructions::elem_drop.value():
case Instructions::table_copy.value():
case Instructions::table_grow.value():
case Instructions::table_size.value():
case Instructions::table_fill.value():
case Instructions::i32_extend8_s.value():
case Instructions::i32_extend16_s.value():
case Instructions::i64_extend8_s.value():
case Instructions::i64_extend16_s.value():
case Instructions::i64_extend32_s.value():
default:
unimplemented:;
dbgln("Instruction '{}' not implemented", instruction_name(instruction.opcode()));
m_do_trap = true;
return;
}
}
void DebuggerBytecodeInterpreter::interpret(Configuration& configuration, InstructionPointer& ip, Instruction const& instruction)
{
if (pre_interpret_hook) {
auto result = pre_interpret_hook(configuration, ip, instruction);
if (!result) {
m_do_trap = true;
return;
}
}
ScopeGuard guard { [&] {
if (post_interpret_hook) {
auto result = post_interpret_hook(configuration, ip, instruction, *this);
if (!result) {
m_do_trap = true;
return;
}
}
} };
BytecodeInterpreter::interpret(configuration, ip, instruction);
}
}

56
Userland/Libraries/LibWasm/AbstractMachine/Interpreter.h
View file

@ -17,60 +17,4 @@ struct Interpreter {
virtual void clear_trap() = 0;
};
struct BytecodeInterpreter : public Interpreter {
virtual void interpret(Configuration&) override;
virtual ~BytecodeInterpreter() override = default;
virtual bool did_trap() const override { return m_do_trap; }
virtual void clear_trap() override { m_do_trap = false; }
struct CallFrameHandle {
explicit CallFrameHandle(BytecodeInterpreter& interpreter, Configuration& configuration)
: m_configuration_handle(configuration)
, m_interpreter(interpreter)
{
}
~CallFrameHandle() = default;
Configuration::CallFrameHandle m_configuration_handle;
BytecodeInterpreter& m_interpreter;
};
protected:
virtual void interpret(Configuration&, InstructionPointer&, Instruction const&);
void branch_to_label(Configuration&, LabelIndex);
template<typename ReadT, typename PushT>
void load_and_push(Configuration&, Instruction const&);
void store_to_memory(Configuration&, Instruction const&, ReadonlyBytes data);
void call_address(Configuration&, FunctionAddress);
template<typename V, typename T>
MakeUnsigned<T> checked_unsigned_truncate(V);
template<typename V, typename T>
MakeSigned<T> checked_signed_truncate(V);
template<typename T>
T read_value(ReadonlyBytes data);
Vector<Value> pop_values(Configuration& configuration, size_t count);
bool trap_if_not(bool value)
{
if (!value)
m_do_trap = true;
return m_do_trap;
}
bool m_do_trap { false };
};
struct DebuggerBytecodeInterpreter : public BytecodeInterpreter {
virtual ~DebuggerBytecodeInterpreter() override = default;
Function<bool(Configuration&, InstructionPointer&, Instruction const&)> pre_interpret_hook;
Function<bool(Configuration&, InstructionPointer&, Instruction const&, Interpreter const&)> post_interpret_hook;
private:
virtual void interpret(Configuration&, InstructionPointer&, Instruction const&) override;
};
}

1
Userland/Libraries/LibWasm/CMakeLists.txt
View file

@ -1,5 +1,6 @@
set(SOURCES
AbstractMachine/AbstractMachine.cpp
AbstractMachine/BytecodeInterpreter.cpp
AbstractMachine/Configuration.cpp
AbstractMachine/Interpreter.cpp
Parser/Parser.cpp

2
Userland/Utilities/wasm.cpp
View file

@ -9,7 +9,7 @@
#include <LibCore/FileStream.h>
#include <LibLine/Editor.h>
#include <LibWasm/AbstractMachine/AbstractMachine.h>
#include <LibWasm/AbstractMachine/Interpreter.h>
#include <LibWasm/AbstractMachine/BytecodeInterpreter.h>
#include <LibWasm/Printer/Printer.h>
#include <LibWasm/Types.h>
#include <signal.h>