355 lines
8.0 KiB
C++
355 lines
8.0 KiB
C++
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#define gen(...) pctx->gen.addf(__VA_ARGS__)
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#define genln(...) do{gen("\n"); gen_indent(); gen(__VA_ARGS__); }while(0)
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global S32 global_indent;
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function void
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gen_indent(){
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for(S32 i = 0; i < global_indent; i++) gen(" ");
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}
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// @todo: Gen complicated decl
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//array 10 ( pointer (pointer array 5 int a))
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// int (*(*(a[5])))[10]
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//
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// 1 Get to the bottom
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// 2 Add variable name
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// 3 Going backwards add arrays and pointers in parens
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// 4 Add type name on the left side
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function void
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gen_simple_decl_prefix(Ast_Resolved_Type *ast){
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switch(ast->kind){
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case TYPE_INT: gen("int "); break;
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case TYPE_BOOL: gen("bool "); break;
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case TYPE_UNSIGNED: gen("unsigned "); break;
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case TYPE_STRING: gen("String "); break;
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case TYPE_VOID: gen("void "); break;
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case TYPE_POINTER:{gen_simple_decl_prefix(ast->base); gen("*");} break;
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case TYPE_ARRAY: gen_simple_decl_prefix(ast->base); break;
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case TYPE_LAMBDA:break;
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case TYPE_STRUCT: {
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auto name = ast->sym->name;
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gen("%s ", name.str);
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}break;
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invalid_default_case;
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}
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}
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function void
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gen_simple_decl_postfix(Ast_Resolved_Type *ast){
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switch(ast->kind){
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case TYPE_INT: break;
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case TYPE_BOOL: break;
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case TYPE_UNSIGNED: break;
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case TYPE_STRING: break;
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case TYPE_VOID: break;
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case TYPE_POINTER: gen_simple_decl_postfix(ast->base); break;
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case TYPE_ARRAY: gen("[%d]", (int)ast->arr.size); gen_simple_decl_postfix(ast->arr.base); break;
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case TYPE_LAMBDA:break;
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case TYPE_STRUCT:break;
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invalid_default_case;
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}
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}
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function void
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gen_simple_decl(Ast_Resolved_Type *ast, Intern_String name){
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if(ast->kind == TYPE_LAMBDA) {
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gen_simple_decl_prefix(ast->func.ret);
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gen("(*%s)(", name.str);
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For(ast->func.args){
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gen_simple_decl_prefix(it[0]);
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if(it != ast->func.args.end() - 1) gen(", ");
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}
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gen(")");
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}
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else{
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gen_simple_decl_prefix(ast);
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if(name.len) {
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gen("%s", name.str);
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gen_simple_decl_postfix(ast);
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}
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}
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}
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function void
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gen_expr(Ast_Expr *ast){
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switch(ast->kind){
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CASE(IDENT, Atom){
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gen("%s", node->intern_val.str);
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BREAK();
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}
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CASE(INT, Atom){
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gen("%lld", node->int_val);
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BREAK();
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}
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CASE(STR, Atom){
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gen("LIT(\"%s\")", node->intern_val.str);
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BREAK();
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}
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CASE(INDEX, Index){
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gen_expr(node->expr);
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gen("[");
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gen_expr(node->index);
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gen("]");
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BREAK();
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}
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CASE(BINARY, Binary){
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gen("(");
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gen_expr(node->left);
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gen("%s", token_kind_string(node->op).str);
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gen_expr(node->right);
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gen(")");
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BREAK();
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}
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CASE(UNARY, Unary){
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switch(node->op){
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case TK_Pointer: {
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gen("(*");
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gen_expr(node->expr);
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gen(")");
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} break;
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case TK_Dereference: {
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gen("(&");
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gen_expr(node->expr);
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gen(")");
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} break;
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invalid_default_case;
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}
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BREAK();
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}
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CASE(CAST, Cast){
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gen("(");
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gen("(");
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gen_simple_decl(resolved_type_get(node->typespec), {});
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gen(")");
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gen_expr(node->expr);
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gen(")");
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BREAK();
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}
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CASE(COMPOUND, Compound){
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gen("(");
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gen_simple_decl(node->type, {});
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gen(")");
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gen("{");
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For(node->exprs){
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auto comp = it[0];
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if(comp->name){
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gen("[");
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gen_expr(comp->name);
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gen("] = ");
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}
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if(comp->index){
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gen("[");
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gen_expr(comp->index);
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gen("] = ");
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}
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assert(comp->item);
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gen_expr(comp->item);
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if(!node->exprs.is_last(it)) gen(", ");
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}
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gen("}");
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BREAK();
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}
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invalid_default_case;
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}
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}
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function void
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gen_ast(Ast *ast);
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function void
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gen_block(Ast_Block *block){
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gen("{");
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global_indent++;
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For(block->stmts) {
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genln("");
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gen_ast(it[0]);
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}
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global_indent--;
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genln("}");
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}
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function void
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gen_ast(Ast *ast){
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switch(ast->kind){
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CASE(PACKAGE, Package){
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For(node->ordered) {
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genln("");
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gen_ast(*it);
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}
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BREAK();
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}
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CASE(RETURN, Return){
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gen("return");
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if(node->expr){
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gen(" ");
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gen_expr(node->expr);
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}
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gen(";");
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BREAK();
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}
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CASE(VAR, Var){
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Sym *sym = resolved_get(node);
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gen_simple_decl(sym->type, node->name);
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if(node->expr){
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gen(" = ");
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gen_expr(node->expr);
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}
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gen(";");
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BREAK();
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}
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CASE(INIT, Init){
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Sym *sym = resolved_get(node);
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gen_simple_decl(sym->type, node->ident->intern_val);
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if(node->expr){
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gen(" = ");
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gen_expr(node->expr);
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}
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gen(";");
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BREAK();
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}
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CASE(IF, If){
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For(node->ifs){
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if(it[0]->init) gen_ast(it[0]->init);
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if(node->ifs.is_first(it)){
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genln("if(");
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gen_expr(it[0]->expr);
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gen(")");
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gen_block(it[0]->block);
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}
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else{
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genln("else");
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if(it[0]->expr){
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gen(" if(");
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gen_expr(it[0]->expr);
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gen(")");
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}
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gen_block(it[0]->block);
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}
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}
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BREAK();
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}
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CASE(CONST, Const){
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Sym *sym = resolved_get(node);
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if(sym->type->kind == TYPE_LAMBDA){
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if(node->value->kind == AST_LAMBDA){
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Ast_Lambda *lambda = (Ast_Lambda *)node->value;
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gen("static ");
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Ast_Resolved_Type *ret = resolved_type_get(lambda->ret);
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gen_simple_decl(ret, node->name);
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gen("(");
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For(lambda->args){
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assert(it[0]->kind == AST_LAMBDA_ARG);
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Ast_Resolved_Type *type = resolved_type_get(it[0]->typespec);
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gen_simple_decl(type, it[0]->name);
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if(it != (lambda->args.end() - 1)) gen(", ");
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}
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gen(")");
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if(lambda->block) {
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gen_block(lambda->block);
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}
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else gen(";");
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}
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else{
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gen_simple_decl(sym->type, node->name);
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gen(" = ");
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gen_expr((Ast_Expr *)node->value);
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gen(";");
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}
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}
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else if(sym->type == type_int){
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gen("enum { %s = %lld };", node->name.str, sym->int_val);
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}
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else if(sym->type == type_string){
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gen("String %s = LIT(\"%s\");", node->name.str, sym->intern_val.str);
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}
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else if(sym->type == type_type){
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if(sym->type_val->kind == TYPE_STRUCT){
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Ast_Struct *agg = const_get_struct(sym->type_val->sym->ast);
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if(node->value->kind == AST_STRUCT){
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gen("struct %s{", node->name.str);
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global_indent++;
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For(agg->members){
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genln("");
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gen_ast(it[0]);
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}
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global_indent--;
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genln("};");
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}
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else{
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// type alias
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}
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}
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else{
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gen("// typedef ");
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gen_simple_decl(sym->type_val, node->name);
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gen(";");
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}
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}
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else{
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parsing_error(node->pos, "C_Codegen: Unhandled type of constant expression");
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}
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BREAK();
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}
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invalid_default_case;
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}
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}
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function String
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compile_string(String filecontent, String filename = "default_name"_s){
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Scratch scratch(thread_ctx.scratch);
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OS_Heap heap = win32_os_heap_create(false, mib(4), 0);
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Parse_Ctx ctx = {};
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ctx.init(scratch, &heap);
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pctx = &ctx;
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lex_restream(&ctx, filecontent, filename);
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Ast_Package *result = parse_file();
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sym_insert_builtins();
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pctx->resolving_package = result;
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gen(R"==(//-------------------------------
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#define NULL_POINTER 0
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#define NULL_LAMBDA 0
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//-------------------------------)==");
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resolve_package(result);
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// eval_decl(result);
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gen_ast(result);
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exp_destroy(&heap);
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String string_result = string_flatten(scratch, &pctx->gen);
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return string_result;
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}
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function String
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compile_file(String filename){
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Scratch scratch;
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String filecontent = os_read_file(scratch, filename);
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assert(filecontent.len);
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String result = compile_string(filecontent, filename);
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return result;
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}
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