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/*
* MRustC - Rust Compiler
* - By John Hodge (Mutabah/thePowersGang)
*
* hir/serialise_lowlevel.hpp
* - HIR (De)Serialisation low-level "protocol"
*/
#pragma once
#include <vector>
#include <string>
#include <map>
#include <stddef.h>
#include <assert.h>
#include <rc_string.hpp>
namespace HIR {
namespace serialise {
class WriterInner;
class ReaderInner;
class Writer
{
WriterInner* m_inner;
::std::map<RcString, unsigned> m_istring_cache;
public:
Writer();
Writer(const Writer&) = delete;
Writer(Writer&&) = delete;
~Writer();
void open(const ::std::string& filename);
void write(const void* data, size_t count);
void write_u8(uint8_t v) {
write(reinterpret_cast<const char*>(&v), 1);
}
void write_u16(uint16_t v) {
uint8_t buf[] = { static_cast<uint8_t>(v & 0xFF), static_cast<uint8_t>(v >> 8) };
this->write(buf, 2);
}
void write_u32(uint32_t v) {
uint8_t buf[] = {
static_cast<uint8_t>(v & 0xFF), static_cast<uint8_t>(v >> 8),
static_cast<uint8_t>(v >> 16), static_cast<uint8_t>(v >> 24) };
this->write(buf, 4);
}
void write_u64(uint64_t v) {
uint8_t buf[] = {
static_cast<uint8_t>(v & 0xFF), static_cast<uint8_t>(v >> 8), static_cast<uint8_t>(v >> 16), static_cast<uint8_t>(v >> 24),
static_cast<uint8_t>(v >> 32), static_cast<uint8_t>(v >> 40), static_cast<uint8_t>(v >> 48), static_cast<uint8_t>(v >> 56)
};
this->write(buf, 8);
}
void write_i64(int64_t v) {
write_u64(static_cast<uint64_t>(v));
}
// Variable-length encoded u64 (for array sizes)
void write_u64c(uint64_t v) {
if( v < (1<<7) ) {
write_u8(static_cast<uint8_t>(v));
}
else if( v < (1<<(6+16)) ) {
uint8_t buf[] = {
static_cast<uint8_t>(0x80 + (v >> 16)), // 0x80 -- 0xBF
static_cast<uint8_t>(v >> 8),
static_cast<uint8_t>(v & 0xFF)
};
this->write(buf, sizeof buf);
}
else if( v < (1ull << (5 + 32)) ) {
uint8_t buf[] = {
static_cast<uint8_t>(0xC0 + (v >> 32)), // 0xC0 -- 0xDF
static_cast<uint8_t>(v >> 24),
static_cast<uint8_t>(v >> 16),
static_cast<uint8_t>(v >> 8),
static_cast<uint8_t>(v)
};
this->write(buf, sizeof buf);
}
else {
uint8_t buf[] = {
0xFF,
static_cast<uint8_t>(v & 0xFF), static_cast<uint8_t>(v >> 8), static_cast<uint8_t>(v >> 16), static_cast<uint8_t>(v >> 24),
static_cast<uint8_t>(v >> 32), static_cast<uint8_t>(v >> 40), static_cast<uint8_t>(v >> 48), static_cast<uint8_t>(v >> 56)
};
this->write(buf, sizeof buf);
}
}
void write_i64c(int64_t v) {
// Convert from 2's completement
bool sign = (v < 0);
uint64_t va = (v < 0 ? -v : v);
va <<= 1;
va |= (sign ? 1 : 0);
write_u64c(va);
}
void write_double(double v) {
// - Just raw-writes the double
this->write(&v, sizeof v);
}
void write_tag(unsigned int t) {
assert(t < 256);
write_u8( static_cast<uint8_t>(t) );
}
void write_count(size_t c) {
//DEBUG("c = " << c);
if(c < 0xFE) {
write_u8( static_cast<uint8_t>(c) );
}
else if( c == ~0u ) {
write_u8( 0xFF );
}
else {
assert(c < (1u<<16));
write_u8( 0xFE );
write_u16( static_cast<uint16_t>(c) );
}
}
void write_string(const RcString& v);
void write_string(size_t len, const char* s) {
if(len < 128) {
write_u8( static_cast<uint8_t>(len) );
}
else {
assert(len < (1u<<(16+7)));
write_u8( static_cast<uint8_t>(128 + (len >> 16)) );
write_u16( static_cast<uint16_t>(len & 0xFFFF) );
}
this->write(s, len);
}
void write_string(const ::std::string& v) {
write_string(v.size(), v.c_str());
}
void write_bool(bool v) {
write_u8(v ? 0xFF : 0x00);
}
};
class ReadBuffer
{
::std::vector<uint8_t> m_backing;
unsigned int m_ofs;
public:
ReadBuffer(size_t size);
size_t capacity() const { return m_backing.capacity(); }
size_t read(void* dst, size_t len);
void populate(ReaderInner& is);
};
class Reader
{
ReaderInner* m_inner;
ReadBuffer m_buffer;
size_t m_pos;
::std::vector<RcString> m_strings;
public:
Reader(const ::std::string& path);
Reader(const Writer&) = delete;
Reader(Writer&&) = delete;
~Reader();
size_t get_pos() const { return m_pos; }
void read(void* dst, size_t count);
uint8_t read_u8() {
uint8_t v;
read(&v, sizeof v);
return v;
}
uint16_t read_u16() {
uint8_t buf[2];
read(buf, sizeof buf);
return static_cast<uint16_t>(buf[0]) | (static_cast<uint16_t>(buf[1]) << 8);
}
uint32_t read_u32() {
uint8_t buf[4];
read(buf, sizeof buf);
return static_cast<uint32_t>(buf[0])
| (static_cast<uint32_t>(buf[1]) << 8)
| (static_cast<uint32_t>(buf[2]) << 16)
| (static_cast<uint32_t>(buf[3]) << 24)
;
}
uint64_t read_u64() {
uint8_t buf[8];
read(buf, sizeof buf);
return static_cast<uint64_t>(buf[0])
| (static_cast<uint64_t>(buf[1]) << 8)
| (static_cast<uint64_t>(buf[2]) << 16)
| (static_cast<uint64_t>(buf[3]) << 24)
| (static_cast<uint64_t>(buf[4]) << 32)
| (static_cast<uint64_t>(buf[5]) << 40)
| (static_cast<uint64_t>(buf[6]) << 48)
| (static_cast<uint64_t>(buf[7]) << 56)
;
}
int64_t read_i64() {
return static_cast<int64_t>(read_u64());
}
// Variable-length encoded u64 (for array sizes)
uint64_t read_u64c() {
auto v = read_u8();
if( v < (1<<7) ) {
return static_cast<uint64_t>(v);
}
else if( v < 0xC0 ) {
uint64_t rv = static_cast<uint64_t>(v & 0x3F) << 16;
rv |= static_cast<uint64_t>(read_u8()) << 8;
rv |= static_cast<uint64_t>(read_u8());
return rv;
}
else if( v < 0xFF ) {
uint64_t rv = static_cast<uint64_t>(v & 0x3F) << 32;
rv |= static_cast<uint64_t>(read_u8()) << 24;
rv |= static_cast<uint64_t>(read_u8()) << 16;
rv |= static_cast<uint64_t>(read_u8()) << 8;
rv |= static_cast<uint64_t>(read_u8());
return rv;
}
else {
return read_u64();
}
}
int64_t read_i64c() {
uint64_t va = read_u64c();
bool sign = (va & 0x1) != 0;
va >>= 1;
if( va == 0 && sign ) {
return INT64_MIN;
}
else if( sign ) {
return -static_cast<int64_t>(va);
}
else {
return static_cast<int64_t>(va);
}
}
double read_double() {
double v;
read(reinterpret_cast<char*>(&v), sizeof v);
return v;
}
unsigned int read_tag() {
return static_cast<unsigned int>( read_u8() );
}
size_t read_count() {
auto v = read_u8();
if( v < 0xFE ) {
return v;
}
else if( v == 0xFE ) {
return read_u16( );
}
else /*if( v == 0xFF )*/ {
return ~0u;
}
}
RcString read_istring() {
size_t idx = read_count();
return m_strings.at(idx);
}
::std::string read_string() {
size_t len = read_u8();
if( len < 128 ) {
}
else {
len = (len & 0x7F) << 16;
len |= read_u16();
}
::std::string rv(len, '\0');
read( const_cast<char*>(rv.data()), len);
return rv;
}
bool read_bool() {
return read_u8() != 0x00;
}
};
} // namespace serialise
} // namespace HIR
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