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- #include <algorithm>
- #include <cassert>
- #include <iostream>
- #include "molasses/parser_primitives.h"
-
- namespace molasses {
- parser_context register_integers(parser_context ctx) {
- ctx.types.push_back(std::make_shared<primitive_type>("i8",1));
- ctx.types.push_back(std::make_shared<primitive_type>("i16",2));
- ctx.types.push_back(std::make_shared<primitive_type>("i32",4));
- ctx.types.push_back(std::make_shared<primitive_type>("i64",8));
- ctx.types.push_back(std::make_shared<primitive_type>("u8",1));
- ctx.types.push_back(std::make_shared<primitive_type>("u16",2));
- ctx.types.push_back(std::make_shared<primitive_type>("u32",4));
- ctx.types.push_back(std::make_shared<primitive_type>("u64",8));
-
- return ctx;
- }
-
- std::vector<std::string> operator>>(std::vector<std::string> current_stack, const operation& next_op) {
- {
- auto args = next_op.argument_types();
- while(not (args.empty() or current_stack.empty())) {
- if(current_stack.back() != args.back()) {
- throw TypeInputError();
- } else {
- args.pop_back();
- current_stack.pop_back();
- }
- }
- if(not args.empty()) {
- throw ValueMissingError();
- }
- }
- {
- auto return_types = next_op.return_types();
- std::move(return_types.begin(), return_types.end(), std::back_inserter(current_stack));
- }
- return current_stack;
- }
-
- std::optional<int32_t> try_parse_int32(const std::string& str) {
- int32_t value;
- auto begin = str.data();
- auto end = str.data()+str.size();
- auto result = std::from_chars(begin, end, value, 10);
- // TODO: Add other bases
- if(result.ptr == end) {
- return value;
- }
- return std::nullopt;
- }
-
- auto find_ptr_by_name_in_container(auto container, const auto& name) -> typeof(*std::begin(container)) {
- auto it = std::find_if(std::begin(container), std::end(container), [&](auto elem){
- return elem->name() == name;
- });
- if(it != std::end(container)) {
- return *it;
- }
- return {};
- }
-
- std::shared_ptr<type> parser_context::lookup_type(const std::string & name) const {
- return find_ptr_by_name_in_container(types, name);
- }
-
- std::shared_ptr<operation> parser_context::lookup_operation(const std::string & name) const {
- return find_ptr_by_name_in_container(operations, name);
- }
-
- bool type_check(
- const parser_context& parser_state,
- const lexed_output& lexer_state,
- const std::vector<symbol>& consumed_stream,
- std::vector<std::string> execution_input,
- const std::vector<std::string>& execution_output
- ) {
- auto& type_stack = execution_input;
-
- for(const auto& symbol : consumed_stream) {
- const auto& symbol_text = lexer_state.dictionary.at(symbol);
- if(auto is_int = try_parse_int32(symbol_text); is_int) {
- type_stack.emplace_back("i32");
- } else if(auto is_op = parser_state.lookup_operation(symbol_text); is_op) {
- type_stack = type_stack >> *is_op;
- }
- }
-
- return type_stack == execution_output;
- }
-
- std::vector<std::string> initialize_stack() {
- return {
- ".bss\n",// TODO: make threadlocal
- "stack_instruction:\n",
- " .quad 0\n",
- ".text\n",
- "initialize_callstack:\n",
- " movq $9, %rax\n",
- " movq $0, %rdi\n",
- " movq $8192, %rsi\n",
- " movq $3, %rdx\n",
- " movq $34, %r10\n",
- " movq $-1, %r8\n",
- " movq $0, %r9\n",
- " syscall\n",
- " movq %rax, (stack_instruction)\n",
- " retq\n",
- };
- }
-
- parser_context parse(parser_context ctx, const lexed_output& lexer_data) {
- enum op : int {
- DO_KW = 1,
- SEPARATOR_KW,
- PROC_KW,
- END_KW
- };
-
- lexed_output fake;
- fake.dictionary[PROC_KW] = "__PROC__";
- fake.dictionary[SEPARATOR_KW] = "__--__";
- fake.dictionary[DO_KW] = "__DO__";
- fake.dictionary[END_KW] = "__END__";
-
- auto tokens = concatenate(fake, lexer_data);
-
- std::vector<std::shared_ptr<procedure_operation>> parsed_procedures;
-
- auto parse_proc = [&](auto it) -> std::pair<typeof(it), std::shared_ptr<procedure_operation>> {
- #define CHECK_FOR_UNEXPECTED_STREAM_END \
- if(it == tokens.symbols.end()) { \
- throw ExpectingTokenError(); \
- }
-
- if(*it != PROC_KW) {
- throw UnexpectedTokenError();
- }
- ++it;
- CHECK_FOR_UNEXPECTED_STREAM_END;
-
- std::string name = tokens.dictionary.at(*it);
- ++it;
- CHECK_FOR_UNEXPECTED_STREAM_END;
-
- if(it == tokens.symbols.end()) {
- throw ExpectingTokenError();
- }
-
- // Process arguments list
- std::vector<std::string> argument_types;
- while(*it != SEPARATOR_KW) {
- argument_types.emplace_back(tokens.dictionary.at(*it));
- ++it;
- CHECK_FOR_UNEXPECTED_STREAM_END;
- }
- ++it;
- CHECK_FOR_UNEXPECTED_STREAM_END;
-
- // Process return types list
- std::vector<std::string> return_types;
- while(*it != DO_KW) {
- return_types.emplace_back(tokens.dictionary.at(*it));
- ++it;
- CHECK_FOR_UNEXPECTED_STREAM_END;
- }
- ++it;
- CHECK_FOR_UNEXPECTED_STREAM_END;
-
- // Process return types list
- std::vector<symbol> body;
- while(*it != END_KW) {
- body.emplace_back(*it);
- ++it;
- CHECK_FOR_UNEXPECTED_STREAM_END;
- }
- ++it;
-
- return std::make_pair(it, std::make_shared<procedure_operation>(name, argument_types, return_types, body));
- #undef CHECK_FOR_UNEXPECTED_STREAM_END
- };
-
- auto progress = tokens.symbols.begin();
-
- do {
- auto [iterator, procedure] = parse_proc(progress);
- ctx.operations.push_back(procedure);
- parsed_procedures.emplace_back(std::move(procedure));
- progress = iterator;
- } while (progress != tokens.symbols.end());
-
- for(auto& proc : parsed_procedures) {
- if(not type_check(ctx, tokens, proc->_body, proc->_args, proc->_rets)) {
- throw ProcedureStackError();
- }
- }
-
- std::vector<std::string> generated;
-
- for(auto instr : initialize_stack()) {
- generated.push_back(instr);
- }
-
- for(auto proc : parsed_procedures) {
- for(auto instr : proc->generate(ctx, tokens)) {
- generated.push_back(instr);
- }
- }
-
- for(auto line : generated) {
- std::cout << line;
- }
-
- return ctx;
- }
-
- std::vector<std::string> generate_call(std::string target) {
- static uint64_t label_count= 0;
- return {
- " movq return_label_n"+std::to_string(label_count)+", (stack_instruction)\n",
- " addq $8, stack_instruction\n",
- " jmp "+target+"\n",
- " return_label_n"+std::to_string(label_count++)+":"
- };
- }
-
- std::vector<std::string> generate_push_int32(int32_t target) {
- return {
- " pushq $" +std::to_string(target)+ "\n"
- };
- }
-
- std::vector<std::string> procedure_operation::generate(const parser_context& ctx, const lexed_output& lexer_data) const {
- std::vector<std::string> ops;
- ops.emplace_back(name()+":\n");
-
- for(auto elem : _body) {
- auto token = lexer_data.dictionary.at(elem);
- if(auto result = try_parse_int32(token); result) {
- for(auto&& elem : generate_push_int32(result.value())) {
- ops.push_back(elem);
- }
- } else if(auto op = ctx.lookup_operation(token); op) {
- for(auto&& elem : op->emit(ctx)) {
- ops.push_back(elem);
- }
- } else {
- throw UnknownTokenError();
- }
- }
-
- ops.emplace_back(" // Return to caller\n");
- ops.emplace_back(" addq $-8, stack_instruction\n");
- ops.emplace_back(" movq (stack_instruction), %rax\n");
- ops.emplace_back(" pushq %rax\n");
- ops.emplace_back(" retq\n");
-
- return ops;
- }
-
- std::vector<std::string> procedure_operation::emit(const parser_context& ctx) const {
- return generate_call(name());
- }
- }
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