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#include <cassert>
#include "assembler.hpp"
#include "bytecode.hpp"
#include "symbol.hpp"
#include "tokenizer.hpp"
namespace SpasmImpl
{
namespace ASM
{
Assembler::Assembler(Lexer::Tokenizer& tokenizer, Bytecode_Stream& bytecode)
: _tokenizer(&tokenizer), _bytecode(&bytecode)
{
}
void Assembler::assemble()
{
Lexer::Token token = _tokenizer->next_token();
while (token.type() != Lexer::Token::endinput)
{
switch (token.type())
{
case Lexer::Token::ident:
assemble_identifier(token);
break;
case Lexer::Token::label:
token = _tokenizer->next_token();
assert(token.type() == Lexer::Token::ident);
_symbols.define(token.value_str(), _bytecode->size());
break;
case Lexer::Token::integer:
case Lexer::Token::xinteger:
_bytecode->push_integer(token.value_int());
break;
default:
_bytecode->push_opcode((Bytecode_Stream::Opcode_t)token.type());
}
token = _tokenizer->next_token();
}
Symbol_Table::const_iterator i = _symbols.begin();
while (i != _symbols.end())
{
backpatch(i->second);
++i;
}
}
void Assembler::backpatch(const Symbol* symbol)
{
Symbol::Positions_t::const_iterator i = symbol->positions_begin();
while (i != symbol->positions_end())
{
_bytecode->set_location(*i, symbol->definition());
++i;
}
}
void Assembler::assemble_identifier(const Lexer::Token& token)
{
Symbol* symbol = _symbols.insert(token.value_str(), _bytecode->size());
_bytecode->push_location(symbol->definition());
}
bool compile(std::istream& istr, Bytecode_Memory& bytecode)
{
Lexer::Tokenizer tokenizer(istr);
Assembler assembler(tokenizer, bytecode);
assembler.assemble();
return true;
}
} // namespace ASM
} // namespace SpasmImpl
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