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spec.hpp
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#pragma once
#include <array>
#include <cstdint>
#include <stdexcept>
#include <string>
#include <vector>
namespace mitey {
template <typename Err>
[[noreturn]] static void __attribute__((preserve_most)) error(const char *msg) {
throw Err(msg);
}
template <typename Err>
[[noreturn]] static void __attribute__((preserve_most)) error(std::string msg) {
// todo: check if forwarding args to `std::string` allows for nicer error messages in hot path errors (or just figure out other system to allow dynamic-ness
throw Err(msg);
}
class malformed_error : public std::runtime_error {
public:
malformed_error(const std::string &msg) : std::runtime_error(msg) {}
};
class validation_error : public std::runtime_error {
public:
validation_error(const std::string &msg) : std::runtime_error(msg) {}
};
class trap_error : public std::runtime_error {
public:
trap_error(const std::string &message) : std::runtime_error(message) {}
};
class link_error : public std::runtime_error {
public:
link_error(const std::string &message) : std::runtime_error(message) {}
};
class uninstantiable_error : public std::runtime_error {
public:
uninstantiable_error(const std::string &message)
: std::runtime_error(message) {}
};
enum class valtype : uint8_t {
null = 0x00,
any = 0xff,
// numtype
i32 = 0x7f,
i64 = 0x7e,
f32 = 0x7d,
f64 = 0x7c,
// // vectype
// v128 = 0x7b,
// reftype
funcref = 0x70,
externref = 0x6f,
};
#ifdef WASM_DEBUG
consteval auto make_valtype_names() {
std::array<std::string_view, 256> names = {};
names[static_cast<uint8_t>(valtype::null)] = "null";
names[static_cast<uint8_t>(valtype::any)] = "any";
names[static_cast<uint8_t>(valtype::i32)] = "i32";
names[static_cast<uint8_t>(valtype::i64)] = "i64";
names[static_cast<uint8_t>(valtype::f32)] = "f32";
names[static_cast<uint8_t>(valtype::f64)] = "f64";
names[static_cast<uint8_t>(valtype::funcref)] = "funcref";
names[static_cast<uint8_t>(valtype::externref)] = "externref";
return names;
}
static constexpr auto valtype_names = make_valtype_names();
#endif
[[noreturn]] static inline void trap(const char *message) {
error<trap_error>(message);
}
static inline bool is_reftype(uint32_t byte) {
return byte == static_cast<uint8_t>(valtype::funcref) ||
byte == static_cast<uint8_t>(valtype::externref);
}
static inline bool is_reftype(valtype type) {
return is_reftype(static_cast<uint8_t>(type));
}
static inline bool is_numtype(uint32_t byte) {
return byte == static_cast<uint8_t>(valtype::i32) ||
byte == static_cast<uint8_t>(valtype::i64) ||
byte == static_cast<uint8_t>(valtype::f32) ||
byte == static_cast<uint8_t>(valtype::f64);
}
static inline bool is_numtype(valtype type) {
return is_numtype(static_cast<uint8_t>(type));
}
static inline bool is_valtype(uint32_t byte) {
return is_numtype(byte) || is_reftype(byte);
}
static inline bool is_valtype(valtype type) {
return is_valtype(static_cast<uint8_t>(type));
}
struct Signature {
std::vector<valtype> params;
std::vector<valtype> results;
template <typename Types, typename Iter>
static Signature &read_blocktype(Types &types, Iter &iter);
};
static inline std::array<Signature, 256> make_singles() {
std::array<Signature, 256> types = {};
types[0x40] = {{}, {}};
types[0x7f] = {{}, {valtype::i32}};
types[0x7e] = {{}, {valtype::i64}};
types[0x7d] = {{}, {valtype::f32}};
types[0x7c] = {{}, {valtype::f64}};
types[0x70] = {{}, {valtype::funcref}};
types[0x6f] = {{}, {valtype::externref}};
return types;
}
template <typename Types, typename Iter>
Signature &Signature::read_blocktype(Types &types, Iter &iter) {
constexpr uint8_t empty_type = 0x40;
static auto singles = make_singles();
uint8_t byte = *iter;
if (byte == empty_type || is_valtype(byte)) {
++iter;
return singles[byte];
} else {
int64_t n = safe_read_sleb128<int64_t, 33>(iter);
return types[n];
}
}
enum class mut {
const_ = 0x0,
var = 0x1,
};
static inline bool is_mut(uint8_t byte) {
return byte == static_cast<uint8_t>(mut::const_) ||
byte == static_cast<uint8_t>(mut::var);
}
// from https://stackoverflow.com/a/28311607
static inline bool is_valid_utf8(const uint8_t *bytes, size_t length) {
if (!bytes)
return true;
const uint8_t *end = bytes + length;
unsigned int cp;
int num;
while (bytes < end) {
if ((*bytes & 0x80) == 0x00) {
// U+0000 to U+007F
cp = (*bytes & 0x7F);
num = 1;
} else if ((*bytes & 0xE0) == 0xC0) {
// U+0080 to U+07FF
cp = (*bytes & 0x1F);
num = 2;
} else if ((*bytes & 0xF0) == 0xE0) {
// U+0800 to U+FFFF
cp = (*bytes & 0x0F);
num = 3;
} else if ((*bytes & 0xF8) == 0xF0) {
// U+10000 to U+10FFFF
cp = (*bytes & 0x07);
num = 4;
} else
return false;
if (bytes + num > end)
return false;
bytes += 1;
for (int i = 1; i < num; ++i) {
if ((*bytes & 0xC0) != 0x80)
return false;
cp = (cp << 6) | (*bytes & 0x3F);
bytes += 1;
}
if ((cp > 0x10FFFF) || ((cp >= 0xD800) && (cp <= 0xDFFF)) ||
((cp <= 0x007F) && (num != 1)) ||
((cp >= 0x0080) && (cp <= 0x07FF) && (num != 2)) ||
((cp >= 0x0800) && (cp <= 0xFFFF) && (num != 3)) ||
((cp >= 0x10000) && (cp <= 0x1FFFFF) && (num != 4)))
return false;
}
return bytes == end;
}
template <typename Iter> static inline int64_t read_sleb128(Iter &iter) {
int64_t result = 0;
uint64_t shift = 0;
uint64_t byte;
do {
byte = *iter++;
result |= (byte & 0x7f) << shift;
shift += 7;
} while (byte & 0x80);
if (shift < 64 && (byte & 0x40)) {
result |= static_cast<int64_t>(-1) << shift;
}
return result;
}
template <typename T, uint8_t BITS = sizeof(T) * 8, typename Iter>
static inline T safe_read_sleb128(Iter &iter) {
Iter start = iter;
int64_t result = read_sleb128(iter);
if (result > static_cast<int64_t>((1ULL << (BITS - 1)) - 1)) {
error<malformed_error>("integer too large");
}
if (result < static_cast<int64_t>(-(1ULL << (BITS - 1)))) {
error<malformed_error>("integer too large");
}
if (static_cast<uint64_t>(iter - start) >
static_cast<uint64_t>(1 + BITS / 7)) {
error<malformed_error>("integer representation too long");
}
if (((iter[-1] != 0 && iter[-1] != 127) + (iter - start - 1) * 7) >= BITS) {
error<malformed_error>("integer too large");
}
return static_cast<T>(result);
}
template <typename Iter> static inline uint64_t read_leb128(Iter &iter) {
uint64_t result = 0;
uint64_t shift = 0;
uint64_t byte;
do {
byte = *iter++;
result |= (byte & 0x7f) << shift;
shift += 7;
} while (byte & 0x80);
return result;
}
template <typename T, uint8_t BITS = sizeof(T) * 8, typename Iter>
static inline T safe_read_leb128(Iter &iter) {
Iter start = iter;
uint64_t result = read_leb128(iter);
if (static_cast<uint64_t>(iter - start) >
static_cast<uint64_t>(1 + BITS / 7)) {
error<malformed_error>("integer representation too long");
}
if (sizeof(T) != 8 && result > (1ULL << BITS) - 1) {
error<malformed_error>("integer too large");
}
return static_cast<T>(result);
}
#define FOREACH_INSTRUCTION(V) \
V(unreachable, "unreachable", 0x00) \
V(nop, "nop", 0x01) \
V(block, "block", 0x02) \
V(loop, "loop", 0x03) \
V(if_, "if", 0x04) \
V(else_, "else", 0x05) \
V(end, "end", 0x0b) \
V(br, "br", 0x0c) \
V(br_if, "br_if", 0x0d) \
V(br_table, "br_table", 0x0e) \
V(return_, "return", 0x0f) \
V(call, "call", 0x10) \
V(call_indirect, "call_indirect", 0x11) \
V(drop, "drop", 0x1a) \
V(select, "select", 0x1b) \
V(select_t, "select_t", 0x1c) \
V(localget, "local.get", 0x20) \
V(localset, "local.set", 0x21) \
V(localtee, "local.tee", 0x22) \
V(globalget, "global.get", 0x23) \
V(globalset, "global.set", 0x24) \
V(tableget, "table.get", 0x25) \
V(tableset, "table.set", 0x26) \
V(i32load, "i32.load", 0x28) \
V(i64load, "i64.load", 0x29) \
V(f32load, "f32.load", 0x2a) \
V(f64load, "f64.load", 0x2b) \
V(i32load8_s, "i32.load8_s", 0x2c) \
V(i32load8_u, "i32.load8_u", 0x2d) \
V(i32load16_s, "i32.load16_s", 0x2e) \
V(i32load16_u, "i32.load16_u", 0x2f) \
V(i64load8_s, "i64.load8_s", 0x30) \
V(i64load8_u, "i64.load8_u", 0x31) \
V(i64load16_s, "i64.load16_s", 0x32) \
V(i64load16_u, "i64.load16_u", 0x33) \
V(i64load32_s, "i64.load32_s", 0x34) \
V(i64load32_u, "i64.load32_u", 0x35) \
V(i32store, "i32.store", 0x36) \
V(i64store, "i64.store", 0x37) \
V(f32store, "f32.store", 0x38) \
V(f64store, "f64.store", 0x39) \
V(i32store8, "i32.store8", 0x3a) \
V(i32store16, "i32.store16", 0x3b) \
V(i64store8, "i64.store8", 0x3c) \
V(i64store16, "i64.store16", 0x3d) \
V(i64store32, "i64.store32", 0x3e) \
V(memorysize, "memory.size", 0x3f) \
V(memorygrow, "memory.grow", 0x40) \
V(i32const, "i32.const", 0x41) \
V(i64const, "i64.const", 0x42) \
V(f32const, "f32.const", 0x43) \
V(f64const, "f64.const", 0x44) \
V(i32eqz, "i32.eqz", 0x45) \
V(i64eqz, "i64.eqz", 0x50) \
V(i32eq, "i32.eq", 0x46) \
V(i64eq, "i64.eq", 0x51) \
V(i32ne, "i32.ne", 0x47) \
V(i64ne, "i64.ne", 0x52) \
V(i32lt_s, "i32.lt_s", 0x48) \
V(i64lt_s, "i64.lt_s", 0x53) \
V(i32lt_u, "i32.lt_u", 0x49) \
V(i64lt_u, "i64.lt_u", 0x54) \
V(i32gt_s, "i32.gt_s", 0x4a) \
V(i64gt_s, "i64.gt_s", 0x55) \
V(i32gt_u, "i32.gt_u", 0x4b) \
V(i64gt_u, "i64.gt_u", 0x56) \
V(i32le_s, "i32.le_s", 0x4c) \
V(i64le_s, "i64.le_s", 0x57) \
V(i32le_u, "i32.le_u", 0x4d) \
V(i64le_u, "i64.le_u", 0x58) \
V(i32ge_s, "i32.ge_s", 0x4e) \
V(i64ge_s, "i64.ge_s", 0x59) \
V(i32ge_u, "i32.ge_u", 0x4f) \
V(i64ge_u, "i64.ge_u", 0x5a) \
V(f32eq, "f32.eq", 0x5b) \
V(f64eq, "f64.eq", 0x61) \
V(f32ne, "f32.ne", 0x5c) \
V(f64ne, "f64.ne", 0x62) \
V(f32lt, "f32.lt", 0x5d) \
V(f64lt, "f64.lt", 0x63) \
V(f32gt, "f32.gt", 0x5e) \
V(f64gt, "f64.gt", 0x64) \
V(f32le, "f32.le", 0x5f) \
V(f64le, "f64.le", 0x65) \
V(f32ge, "f32.ge", 0x60) \
V(f64ge, "f64.ge", 0x66) \
V(i32clz, "i32.clz", 0x67) \
V(i64clz, "i64.clz", 0x79) \
V(i32ctz, "i32.ctz", 0x68) \
V(i64ctz, "i64.ctz", 0x7a) \
V(i32popcnt, "i32.popcnt", 0x69) \
V(i64popcnt, "i64.popcnt", 0x7b) \
V(i32add, "i32.add", 0x6a) \
V(i64add, "i64.add", 0x7c) \
V(i32sub, "i32.sub", 0x6b) \
V(i64sub, "i64.sub", 0x7d) \
V(i32mul, "i32.mul", 0x6c) \
V(i64mul, "i64.mul", 0x7e) \
V(i32div_s, "i32.div_s", 0x6d) \
V(i64div_s, "i64.div_s", 0x7f) \
V(i32div_u, "i32.div_u", 0x6e) \
V(i64div_u, "i64.div_u", 0x80) \
V(i32rem_s, "i32.rem_s", 0x6f) \
V(i64rem_s, "i64.rem_s", 0x81) \
V(i32rem_u, "i32.rem_u", 0x70) \
V(i64rem_u, "i64.rem_u", 0x82) \
V(i32and, "i32.and", 0x71) \
V(i64and, "i64.and", 0x83) \
V(i32or, "i32.or", 0x72) \
V(i64or, "i64.or", 0x84) \
V(i32xor, "i32.xor", 0x73) \
V(i64xor, "i64.xor", 0x85) \
V(i32shl, "i32.shl", 0x74) \
V(i64shl, "i64.shl", 0x86) \
V(i32shr_s, "i32.shr_s", 0x75) \
V(i64shr_s, "i64.shr_s", 0x87) \
V(i32shr_u, "i32.shr_u", 0x76) \
V(i64shr_u, "i64.shr_u", 0x88) \
V(i32rotl, "i32.rotl", 0x77) \
V(i64rotl, "i64.rotl", 0x89) \
V(i32rotr, "i32.rotr", 0x78) \
V(i64rotr, "i64.rotr", 0x8a) \
V(f32abs, "f32.abs", 0x8b) \
V(f64abs, "f64.abs", 0x99) \
V(f32neg, "f32.neg", 0x8c) \
V(f64neg, "f64.neg", 0x9a) \
V(f32ceil, "f32.ceil", 0x8d) \
V(f64ceil, "f64.ceil", 0x9b) \
V(f32floor, "f32.floor", 0x8e) \
V(f64floor, "f64.floor", 0x9c) \
V(f32trunc, "f32.trunc", 0x8f) \
V(f64trunc, "f64.trunc", 0x9d) \
V(f32nearest, "f32.nearest", 0x90) \
V(f64nearest, "f64.nearest", 0x9e) \
V(f32sqrt, "f32.sqrt", 0x91) \
V(f64sqrt, "f64.sqrt", 0x9f) \
V(f32add, "f32.add", 0x92) \
V(f64add, "f64.add", 0xa0) \
V(f32sub, "f32.sub", 0x93) \
V(f64sub, "f64.sub", 0xa1) \
V(f32mul, "f32.mul", 0x94) \
V(f64mul, "f64.mul", 0xa2) \
V(f32div, "f32.div", 0x95) \
V(f64div, "f64.div", 0xa3) \
V(f32min, "f32.min", 0x96) \
V(f64min, "f64.min", 0xa4) \
V(f32max, "f32.max", 0x97) \
V(f64max, "f64.max", 0xa5) \
V(f32copysign, "f32.copysign", 0x98) \
V(f64copysign, "f64.copysign", 0xa6) \
V(i32wrap_i64, "i32.wrap_i64", 0xa7) \
V(i64extend_i32_s, "i64.extend_i32_s", 0xac) \
V(i64extend_i32_u, "i64.extend_i32_u", 0xad) \
V(i32trunc_f32_s, "i32.trunc_f32_s", 0xa8) \
V(i64trunc_f32_s, "i64.trunc_f32_s", 0xae) \
V(i32trunc_f32_u, "i32.trunc_f32_u", 0xa9) \
V(i64trunc_f32_u, "i64.trunc_f32_u", 0xaf) \
V(i32trunc_f64_s, "i32.trunc_f64_s", 0xaa) \
V(i64trunc_f64_s, "i64.trunc_f64_s", 0xb0) \
V(i32trunc_f64_u, "i32.trunc_f64_u", 0xab) \
V(i64trunc_f64_u, "i64.trunc_f64_u", 0xb1) \
V(f32convert_i32_s, "f32.convert_i32_s", 0xb2) \
V(f64convert_i32_s, "f64.convert_i32_s", 0xb7) \
V(f32convert_i32_u, "f32.convert_i32_u", 0xb3) \
V(f64convert_i32_u, "f64.convert_i32_u", 0xb8) \
V(f32convert_i64_s, "f32.convert_i64_s", 0xb4) \
V(f64convert_i64_s, "f64.convert_i64_s", 0xb9) \
V(f32convert_i64_u, "f32.convert_i64_u", 0xb5) \
V(f64convert_i64_u, "f64.convert_i64_u", 0xba) \
V(f32demote_f64, "f32.demote_f64", 0xb6) \
V(f64promote_f32, "f64.promote_f32", 0xbb) \
V(i32reinterpret_f32, "i32.reinterpret_f32", 0xbc) \
V(f32reinterpret_i32, "f32.reinterpret_i32", 0xbe) \
V(i64reinterpret_f64, "i64.reinterpret_f64", 0xbd) \
V(f64reinterpret_i64, "f64.reinterpret_i64", 0xbf) \
V(i32extend8_s, "i32.extend8_s", 0xc0) \
V(i32extend16_s, "i32.extend16_s", 0xc1) \
V(i64extend8_s, "i64.extend8_s", 0xc2) \
V(i64extend16_s, "i64.extend16_s", 0xc3) \
V(i64extend32_s, "i64.extend32_s", 0xc4) \
V(ref_null, "ref.null", 0xd0) \
V(ref_is_null, "ref.is_null", 0xd1) \
V(ref_func, "ref.func", 0xd2) \
V(ref_eq, "ref.eq", 0xd5) \
V(multibyte, "multibyte", 0xfc)
#define FOREACH_MULTIBYTE_INSTRUCTION(V) \
V(i32_trunc_sat_f32_s, "i32.trunc_sat_f32_s", 0x00) \
V(i32_trunc_sat_f32_u, "i32.trunc_sat_f32_u", 0x01) \
V(i32_trunc_sat_f64_s, "i32.trunc_sat_f64_s", 0x02) \
V(i32_trunc_sat_f64_u, "i32.trunc_sat_f64_u", 0x03) \
V(i64_trunc_sat_f32_s, "i64.trunc_sat_f32_s", 0x04) \
V(i64_trunc_sat_f32_u, "i64.trunc_sat_f32_u", 0x05) \
V(i64_trunc_sat_f64_s, "i64.trunc_sat_f64_s", 0x06) \
V(i64_trunc_sat_f64_u, "i64.trunc_sat_f64_u", 0x07) \
V(memory_init, "memory.init", 0x08) \
V(data_drop, "data.drop", 0x09) \
V(memory_copy, "memory.copy", 0x0a) \
V(memory_fill, "memory.fill", 0x0b) \
V(table_init, "table.init", 0x0c) \
V(elem_drop, "elem.drop", 0x0d) \
V(table_copy, "table.copy", 0x0e) \
V(table_grow, "table.grow", 0x0f) \
V(table_size, "table.size", 0x10) \
V(table_fill, "table.fill", 0x11)
enum class Instruction {
#define DEFINE_ENUM(name, str, byte) name = byte,
FOREACH_INSTRUCTION(DEFINE_ENUM)
#undef DEFINE_ENUM
};
enum class FCInstruction {
#define DEFINE_ENUM(name, str, byte) name = byte,
FOREACH_MULTIBYTE_INSTRUCTION(DEFINE_ENUM)
#undef DEFINE_ENUM
};
#ifdef WASM_DEBUG
consteval auto make_instructions() {
std::array<std::string_view, 256> instructions = {};
#define DEFINE_NAME(name, str, byte) instructions[byte] = str;
FOREACH_INSTRUCTION(DEFINE_NAME)
#undef DEFINE_NAME
return instructions;
}
static constexpr auto instructions = make_instructions();
consteval auto make_multibyte_instructions() {
std::array<std::string_view, 256> instructions = {};
#define DEFINE_NAME(name, str, byte) instructions[byte] = str;
FOREACH_MULTIBYTE_INSTRUCTION(DEFINE_NAME)
#undef DEFINE_NAME
return instructions;
}
static constexpr auto multibyte_instructions = make_multibyte_instructions();
#endif
static inline bool is_instruction(uint8_t byte) {
#define DEFINE_EQ(name, str, byte_) \
if (byte == byte_) \
return true;
FOREACH_INSTRUCTION(DEFINE_EQ)
#undef DEFINE_EQ
return false;
}
} // namespace mitey