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// WebAssembly C++ API
#ifndef WASM_HH
#define WASM_HH
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <memory>
#include <limits>
#include <string>
#ifndef WASM_API_EXTERN
#if defined(_WIN32) && !defined(__MINGW32__) && !defined(LIBWASM_STATIC)
#define WASM_API_EXTERN __declspec(dllimport)
#else
#define WASM_API_EXTERN
#endif
#endif
///////////////////////////////////////////////////////////////////////////////
// Auxiliaries
// Machine types
static_assert(sizeof(float) == sizeof(int32_t), "incompatible float type");
static_assert(sizeof(double) == sizeof(int64_t), "incompatible double type");
static_assert(sizeof(intptr_t) == sizeof(int32_t) ||
sizeof(intptr_t) == sizeof(int64_t), "incompatible pointer type");
using byte_t = char;
using float32_t = float;
using float64_t = double;
namespace wasm {
// Vectors
template<class T>
class vec {
static const size_t invalid_size = SIZE_MAX;
size_t size_;
std::unique_ptr<T[]> data_;
#ifdef WASM_API_DEBUG
WASM_API_EXTERN void make_data();
WASM_API_EXTERN void free_data();
#else
void make_data() {}
void free_data() {}
#endif
vec(size_t size) : vec(size, size ? new(std::nothrow) T[size] : nullptr) {
make_data();
}
vec(size_t size, T* data) : size_(size), data_(data) {
assert(!!size_ == !!data_ || size_ == invalid_size);
}
public:
using elem_type = T;
vec(vec<T>&& that) : vec(that.size_, that.data_.release()) {
that.size_ = invalid_size;
}
~vec() {
free_data();
}
operator bool() const {
return bool(size_ != invalid_size);
}
auto size() const -> size_t {
return size_;
}
auto get() const -> const T* {
return data_.get();
}
auto get() -> T* {
return data_.get();
}
auto release() -> T* {
size_ = invalid_size;
return data_.release();
}
void reset() {
free_data();
size_ = invalid_size;
data_.reset();
}
void reset(vec& that) {
free_data();
size_ = that.size_;
data_.reset(that.data_.release());
that.size_ = invalid_size;
}
auto operator=(vec&& that) -> vec& {
reset(that);
return *this;
}
auto operator[](size_t i) -> T& {
assert(i < size_);
return data_[i];
}
auto operator[](size_t i) const -> const T& {
assert(i < size_);
return data_[i];
}
auto copy() const -> vec {
auto v = vec(size_);
if (v) for (size_t i = 0; i < size_; ++i) v.data_[i] = data_[i];
return v;
}
// TODO: This can't be used for e.g. vec<Value>
auto deep_copy() const -> vec {
auto v = vec(size_);
if (v) for (size_t i = 0; i < size_; ++i) v.data_[i] = data_[i]->copy();
return v;
}
static auto make_uninitialized(size_t size = 0) -> vec {
return vec(size);
}
static auto make(size_t size, T init[]) -> vec {
auto v = vec(size);
if (v) for (size_t i = 0; i < size; ++i) v.data_[i] = std::move(init[i]);
return v;
}
static auto make(std::string s) -> vec<char> {
auto v = vec(s.length());
if (v) std::strncpy(v.get(), s.data(), s.length());
return v;
}
static auto make_nt(std::string s) -> vec<char> {
auto v = vec(s.length() + 1);
if (v) std::strcpy(v.get(), s.data());
return v;
}
// TODO(mvsc): MVSC requires this special case:
static auto make() -> vec {
return vec(0);
}
template<class... Ts>
static auto make(Ts&&... args) -> vec {
T data[] = { std::forward<Ts>(args)... };
return make(sizeof...(Ts), data);
}
static auto adopt(size_t size, T data[]) -> vec {
return vec(size, data);
}
static auto invalid() -> vec {
return vec(invalid_size, nullptr);
}
};
// Ownership
template<class T> using own = std::unique_ptr<T>;
template<class T> using ownvec = vec<own<T>>;
template<class T>
auto make_own(T* x) -> own<T> { return own<T>(x); }
///////////////////////////////////////////////////////////////////////////////
// Runtime Environment
// Configuration
class WASM_API_EXTERN Config {
public:
Config() = delete;
~Config();
void operator delete(void*);
static auto make() -> own<Config>;
// Implementations may provide custom methods for manipulating Configs.
};
// Engine
class WASM_API_EXTERN Engine {
public:
Engine() = delete;
~Engine();
void operator delete(void*);
static auto make(own<Config>&& = Config::make()) -> own<Engine>;
};
// Store
class WASM_API_EXTERN Store {
public:
Store() = delete;
~Store();
void operator delete(void*);
static auto make(Engine*) -> own<Store>;
};
///////////////////////////////////////////////////////////////////////////////
// Type Representations
// Type attributes
enum class Mutability : uint8_t { CONST, VAR };
struct Limits {
uint32_t min;
uint32_t max;
Limits(uint32_t min, uint32_t max = std::numeric_limits<uint32_t>::max()) :
min(min), max(max) {}
};
// Value Types
enum class ValueKind : uint8_t {
I32, I64, F32, F64,
ANYREF = 128, FUNCREF,
};
inline bool is_num(ValueKind k) { return k < ValueKind::ANYREF; }
inline bool is_ref(ValueKind k) { return k >= ValueKind::ANYREF; }
class WASM_API_EXTERN ValueType {
public:
ValueType() = delete;
~ValueType();
void operator delete(void*);
static auto make(ValueKind) -> own<ValueType>;
auto copy() const -> own<ValueType>;
auto kind() const -> ValueKind;
auto is_num() const -> bool { return wasm::is_num(kind()); }
auto is_ref() const -> bool { return wasm::is_ref(kind()); }
};
// External Types
enum class ExternKind : uint8_t {
FUNC, GLOBAL, TABLE, MEMORY
};
class FuncType;
class GlobalType;
class TableType;
class MemoryType;
class WASM_API_EXTERN ExternType {
public:
ExternType() = delete;
~ExternType();
void operator delete(void*);
auto copy() const-> own<ExternType>;
auto kind() const -> ExternKind;
auto func() -> FuncType*;
auto global() -> GlobalType*;
auto table() -> TableType*;
auto memory() -> MemoryType*;
auto func() const -> const FuncType*;
auto global() const -> const GlobalType*;
auto table() const -> const TableType*;
auto memory() const -> const MemoryType*;
};
// Function Types
class WASM_API_EXTERN FuncType : public ExternType {
public:
FuncType() = delete;
~FuncType();
static auto make(
ownvec<ValueType>&& params = ownvec<ValueType>::make(),
ownvec<ValueType>&& results = ownvec<ValueType>::make()
) -> own<FuncType>;
auto copy() const -> own<FuncType>;
auto params() const -> const ownvec<ValueType>&;
auto results() const -> const ownvec<ValueType>&;
};
// Global Types
class WASM_API_EXTERN GlobalType : public ExternType {
public:
GlobalType() = delete;
~GlobalType();
static auto make(own<ValueType>&&, Mutability) -> own<GlobalType>;
auto copy() const -> own<GlobalType>;
auto content() const -> const ValueType*;
auto mutability() const -> Mutability;
};
// Table Types
class WASM_API_EXTERN TableType : public ExternType {
public:
TableType() = delete;
~TableType();
static auto make(own<ValueType>&&, Limits) -> own<TableType>;
auto copy() const -> own<TableType>;
auto element() const -> const ValueType*;
auto limits() const -> const Limits&;
};
// Memory Types
class WASM_API_EXTERN MemoryType : public ExternType {
public:
MemoryType() = delete;
~MemoryType();
static auto make(Limits) -> own<MemoryType>;
auto copy() const -> own<MemoryType>;
auto limits() const -> const Limits&;
};
// Import Types
using Name = vec<byte_t>;
class WASM_API_EXTERN ImportType {
public:
ImportType() = delete;
~ImportType();
void operator delete(void*);
static auto make(Name&& module, Name&& name, own<ExternType>&&) ->
own<ImportType>;
auto copy() const -> own<ImportType>;
auto module() const -> const Name&;
auto name() const -> const Name&;
auto type() const -> const ExternType*;
};
// Export Types
class WASM_API_EXTERN ExportType {
public:
ExportType() = delete;
~ExportType();
void operator delete(void*);
static auto make(Name&&, own<ExternType>&&) -> own<ExportType>;
auto copy() const -> own<ExportType>;
auto name() const -> const Name&;
auto type() const -> const ExternType*;
};
///////////////////////////////////////////////////////////////////////////////
// Runtime Objects
// References
class WASM_API_EXTERN Ref {
public:
Ref() = delete;
~Ref();
void operator delete(void*);
auto copy() const -> own<Ref>;
auto same(const Ref*) const -> bool;
auto get_host_info() const -> void*;
void set_host_info(void* info, void (*finalizer)(void*) = nullptr);
};
// Values
class Value {
ValueKind kind_;
union impl {
int32_t i32;
int64_t i64;
float32_t f32;
float64_t f64;
Ref* ref;
} impl_;
Value(ValueKind kind, impl impl) : kind_(kind), impl_(impl) {}
public:
Value() : kind_(ValueKind::ANYREF) { impl_.ref = nullptr; }
explicit Value(int32_t i) : kind_(ValueKind::I32) { impl_.i32 = i; }
explicit Value(int64_t i) : kind_(ValueKind::I64) { impl_.i64 = i; }
explicit Value(float32_t z) : kind_(ValueKind::F32) { impl_.f32 = z; }
explicit Value(float64_t z) : kind_(ValueKind::F64) { impl_.f64 = z; }
explicit Value(own<Ref>&& r) : kind_(ValueKind::ANYREF) { impl_.ref = r.release(); }
Value(Value&& that) : kind_(that.kind_), impl_(that.impl_) {
if (is_ref()) that.impl_.ref = nullptr;
}
~Value() {
reset();
}
auto is_num() const -> bool { return wasm::is_num(kind_); }
auto is_ref() const -> bool { return wasm::is_ref(kind_); }
static auto i32(int32_t x) -> Value { return Value(x); }
static auto i64(int64_t x) -> Value { return Value(x); }
static auto f32(float32_t x) -> Value { return Value(x); }
static auto f64(float64_t x) -> Value { return Value(x); }
static auto ref(own<Ref>&& x) -> Value { return Value(std::move(x)); }
template<class T> inline static auto make(T x) -> Value;
template<class T> inline static auto make(own<T>&& x) -> Value;
void reset() {
if (is_ref() && impl_.ref) {
delete impl_.ref;
impl_.ref = nullptr;
}
}
void reset(Value& that) {
reset();
kind_ = that.kind_;
impl_ = that.impl_;
if (is_ref()) that.impl_.ref = nullptr;
}
auto operator=(Value&& that) -> Value& {
reset(that);
return *this;
}
auto kind() const -> ValueKind { return kind_; }
auto i32() const -> int32_t { assert(kind_ == ValueKind::I32); return impl_.i32; }
auto i64() const -> int64_t { assert(kind_ == ValueKind::I64); return impl_.i64; }
auto f32() const -> float32_t { assert(kind_ == ValueKind::F32); return impl_.f32; }
auto f64() const -> float64_t { assert(kind_ == ValueKind::F64); return impl_.f64; }
auto ref() const -> Ref* { assert(is_ref()); return impl_.ref; }
template<class T> inline auto get() const -> T;
auto release_ref() -> own<Ref> {
assert(is_ref());
auto ref = impl_.ref;
impl_.ref = nullptr;
return own<Ref>(ref);
}
auto copy() const -> Value {
if (is_ref() && impl_.ref != nullptr) {
// TODO(mvsc): MVSC cannot handle this:
// impl impl = {.ref = impl_.ref->copy().release()};
impl impl;
impl.ref = impl_.ref->copy().release();
return Value(kind_, impl);
} else {
return Value(kind_, impl_);
}
}
};
template<> inline auto Value::make<int32_t>(int32_t x) -> Value { return Value(x); }
template<> inline auto Value::make<int64_t>(int64_t x) -> Value { return Value(x); }
template<> inline auto Value::make<float32_t>(float32_t x) -> Value { return Value(x); }
template<> inline auto Value::make<float64_t>(float64_t x) -> Value { return Value(x); }
template<> inline auto Value::make<Ref>(own<Ref>&& x) -> Value {
return Value(std::move(x));
}
template<> inline auto Value::make<uint32_t>(uint32_t x) -> Value {
return Value(static_cast<int32_t>(x));
}
template<> inline auto Value::make<uint64_t>(uint64_t x) -> Value {
return Value(static_cast<int64_t>(x));
}
template<> inline auto Value::get<int32_t>() const -> int32_t { return i32(); }
template<> inline auto Value::get<int64_t>() const -> int64_t { return i64(); }
template<> inline auto Value::get<float32_t>() const -> float32_t { return f32(); }
template<> inline auto Value::get<float64_t>() const -> float64_t { return f64(); }
template<> inline auto Value::get<Ref*>() const -> Ref* { return ref(); }
template<> inline auto Value::get<uint32_t>() const -> uint32_t {
return static_cast<uint32_t>(i32());
}
template<> inline auto Value::get<uint64_t>() const -> uint64_t {
return static_cast<uint64_t>(i64());
}
// Traps
using Message = vec<byte_t>; // null terminated
class Instance;
class WASM_API_EXTERN Frame {
public:
Frame() = delete;
~Frame();
void operator delete(void*);
auto copy() const -> own<Frame>;
auto instance() const -> Instance*;
auto func_index() const -> uint32_t;
auto func_offset() const -> size_t;
auto module_offset() const -> size_t;
};
class WASM_API_EXTERN Trap : public Ref {
public:
Trap() = delete;
~Trap();
static auto make(Store*, const Message& msg) -> own<Trap>;
auto copy() const -> own<Trap>;
auto message() const -> Message;
auto origin() const -> own<Frame>; // may be null
auto trace() const -> ownvec<Frame>; // may be empty, origin first
};
// Shared objects
template<class T>
class WASM_API_EXTERN Shared {
public:
Shared() = delete;
~Shared();
void operator delete(void*);
};
// Modules
class WASM_API_EXTERN Module : public Ref {
public:
Module() = delete;
~Module();
static auto validate(Store*, const vec<byte_t>& binary) -> bool;
static auto make(Store*, const vec<byte_t>& binary) -> own<Module>;
auto copy() const -> own<Module>;
auto imports() const -> ownvec<ImportType>;
auto exports() const -> ownvec<ExportType>;
auto share() const -> own<Shared<Module>>;
static auto obtain(Store*, const Shared<Module>*) -> own<Module>;
auto serialize() const -> vec<byte_t>;
static auto deserialize(Store*, const vec<byte_t>&) -> own<Module>;
};
// Foreign Objects
class WASM_API_EXTERN Foreign : public Ref {
public:
Foreign() = delete;
~Foreign();
static auto make(Store*) -> own<Foreign>;
auto copy() const -> own<Foreign>;
};
// Externals
class Func;
class Global;
class Table;
class Memory;
class WASM_API_EXTERN Extern : public Ref {
public:
Extern() = delete;
~Extern();
auto copy() const -> own<Extern>;
auto kind() const -> ExternKind;
auto type() const -> own<ExternType>;
auto func() -> Func*;
auto global() -> Global*;
auto table() -> Table*;
auto memory() -> Memory*;
auto func() const -> const Func*;
auto global() const -> const Global*;
auto table() const -> const Table*;
auto memory() const -> const Memory*;
};
// Function Instances
class WASM_API_EXTERN Func : public Extern {
public:
Func() = delete;
~Func();
using callback = auto (*)(const vec<Value>&, vec<Value>&) -> own<Trap>;
using callback_with_env = auto (*)(void*, const vec<Value>&, vec<Value>&) -> own<Trap>;
static auto make(Store*, const FuncType*, callback) -> own<Func>;
static auto make(Store*, const FuncType*, callback_with_env,
void*, void (*finalizer)(void*) = nullptr) -> own<Func>;
auto copy() const -> own<Func>;
auto type() const -> own<FuncType>;
auto param_arity() const -> size_t;
auto result_arity() const -> size_t;
auto call(const vec<Value>&, vec<Value>&) const -> own<Trap>;
};
// Global Instances
class WASM_API_EXTERN Global : public Extern {
public:
Global() = delete;
~Global();
static auto make(Store*, const GlobalType*, const Value&) -> own<Global>;
auto copy() const -> own<Global>;
auto type() const -> own<GlobalType>;
auto get() const -> Value;
void set(const Value&);
};
// Table Instances
class WASM_API_EXTERN Table : public Extern {
public:
Table() = delete;
~Table();
using size_t = uint32_t;
static auto make(
Store*, const TableType*, const Ref* init = nullptr) -> own<Table>;
auto copy() const -> own<Table>;
auto type() const -> own<TableType>;
auto get(size_t index) const -> own<Ref>;
auto set(size_t index, const Ref*) -> bool;
auto size() const -> size_t;
auto grow(size_t delta, const Ref* init = nullptr) -> bool;
};
// Memory Instances
class WASM_API_EXTERN Memory : public Extern {
public:
Memory() = delete;
~Memory();
static auto make(Store*, const MemoryType*) -> own<Memory>;
auto copy() const -> own<Memory>;
using pages_t = uint32_t;
static const size_t page_size = 0x10000;
auto type() const -> own<MemoryType>;
auto data() const -> byte_t*;
auto data_size() const -> size_t;
auto size() const -> pages_t;
auto grow(pages_t delta) -> bool;
};
// Module Instances
class WASM_API_EXTERN Instance : public Ref {
public:
Instance() = delete;
~Instance();
static auto make(
Store*, const Module*, const vec<Extern*>&, own<Trap>* = nullptr
) -> own<Instance>;
auto copy() const -> own<Instance>;
auto exports() const -> ownvec<Extern>;
};
///////////////////////////////////////////////////////////////////////////////
} // namespace wasm
#endif // #ifdef WASM_HH