Build as C++

1 files changed, 566 insertions, 0 deletions

diff --git a/src/check_decl.cpp b/src/check_decl.cpp
new file mode 100644
index 000000000..f31434c01
--- /dev/null
+++ b/src/check_decl.cpp
@@ -0,0 +1,566 @@
+bool check_is_terminating(AstNode *node);
+void check_stmt          (Checker *c, AstNode *node, u32 flags);
+
+// NOTE(bill): `content_name` is for debugging and error messages
+Type *check_init_variable(Checker *c, Entity *e, Operand *operand, String context_name) {
+	if (operand->mode == Addressing_Invalid ||
+		operand->type == t_invalid ||
+		e->type == t_invalid) {
+
+		if (operand->mode == Addressing_Builtin) {
+			gbString expr_str = expr_to_string(operand->expr);
+
+			// TODO(bill): is this a good enough error message?
+			// TODO(bill): Actually allow built in procedures to be passed around and thus be created on use
+			error_node(operand->expr,
+				  "Cannot assign builtin procedure `%s` in %.*s",
+				  expr_str,
+				  LIT(context_name));
+
+			operand->mode = Addressing_Invalid;
+
+			gb_string_free(expr_str);
+		}
+
+
+		if (e->type == NULL) {
+			e->type = t_invalid;
+		}
+		return NULL;
+	}
+
+	if (e->type == NULL) {
+		// NOTE(bill): Use the type of the operand
+		Type *t = operand->type;
+		if (is_type_untyped(t)) {
+			if (t == t_invalid || is_type_untyped_nil(t)) {
+				error(e->token, "Use of untyped nil in %.*s", LIT(context_name));
+				e->type = t_invalid;
+				return NULL;
+			}
+			t = default_type(t);
+		}
+		if (is_type_bit_field_value(t)) {
+			t = default_bit_field_value_type(t);
+		}
+
+		GB_ASSERT(is_type_typed(t));
+		e->type = t;
+	}
+
+	e->parent_proc_decl = c->context.curr_proc_decl;
+
+	check_assignment(c, operand, e->type, context_name);
+	if (operand->mode == Addressing_Invalid) {
+		return NULL;
+	}
+
+	return e->type;
+}
+
+void check_init_variables(Checker *c, Entity **lhs, isize lhs_count, AstNodeArray inits, String context_name) {
+	if ((lhs == NULL || lhs_count == 0) && inits.count == 0) {
+		return;
+	}
+
+	gbTempArenaMemory tmp = gb_temp_arena_memory_begin(&c->tmp_arena);
+
+	// NOTE(bill): If there is a bad syntax error, rhs > lhs which would mean there would need to be
+	// an extra allocation
+	ArrayOperand operands = {};
+	array_init_reserve(&operands, c->tmp_allocator, 2*lhs_count);
+	check_unpack_arguments(c, lhs_count, &operands, inits, true);
+
+	isize rhs_count = operands.count;
+	for_array(i, operands) {
+		if (operands.e[i].mode == Addressing_Invalid) {
+			rhs_count--;
+		}
+	}
+
+	isize max = gb_min(lhs_count, rhs_count);
+	for (isize i = 0; i < max; i++) {
+		check_init_variable(c, lhs[i], &operands.e[i], context_name);
+	}
+	if (rhs_count > 0 && lhs_count != rhs_count) {
+		error(lhs[0]->token, "Assignment count mismatch `%td` = `%td`", lhs_count, rhs_count);
+	}
+
+	gb_temp_arena_memory_end(tmp);
+}
+
+void check_init_constant(Checker *c, Entity *e, Operand *operand) {
+	if (operand->mode == Addressing_Invalid ||
+		operand->type == t_invalid ||
+		e->type == t_invalid) {
+		if (e->type == NULL) {
+			e->type = t_invalid;
+		}
+		return;
+	}
+
+	if (operand->mode != Addressing_Constant) {
+		// TODO(bill): better error
+		gbString str = expr_to_string(operand->expr);
+		error_node(operand->expr, "`%s` is not a constant", str);
+		gb_string_free(str);
+		if (e->type == NULL) {
+			e->type = t_invalid;
+		}
+		return;
+	}
+	if (!is_type_constant_type(operand->type)) {
+		gbString type_str = type_to_string(operand->type);
+		error_node(operand->expr, "Invalid constant type: `%s`", type_str);
+		gb_string_free(type_str);
+		if (e->type == NULL) {
+			e->type = t_invalid;
+		}
+		return;
+	}
+
+	if (e->type == NULL) { // NOTE(bill): type inference
+		e->type = operand->type;
+	}
+
+	check_assignment(c, operand, e->type, str_lit("constant declaration"));
+	if (operand->mode == Addressing_Invalid) {
+		return;
+	}
+
+	e->parent_proc_decl = c->context.curr_proc_decl;
+
+	e->Constant.value = operand->value;
+}
+
+void check_type_decl(Checker *c, Entity *e, AstNode *type_expr, Type *def) {
+	GB_ASSERT(e->type == NULL);
+	String name = e->token.string;
+	Type *named = make_type_named(c->allocator, name, NULL, e);
+	named->Named.type_name = e;
+	if (def != NULL && def->kind == Type_Named) {
+		def->Named.base = named;
+	}
+	e->type = named;
+
+	// gb_printf_err("%.*s %p\n", LIT(e->token.string), e);
+
+	Type *bt = check_type_extra(c, type_expr, named);
+	named->Named.base = base_type(bt);
+	if (named->Named.base == t_invalid) {
+		// gb_printf("check_type_decl: %s\n", type_to_string(named));
+	}
+}
+
+void check_const_decl(Checker *c, Entity *e, AstNode *type_expr, AstNode *init, Type *named_type) {
+	GB_ASSERT(e->type == NULL);
+	GB_ASSERT(e->kind == Entity_Constant);
+
+	if (e->flags & EntityFlag_Visited) {
+		e->type = t_invalid;
+		return;
+	}
+	e->flags |= EntityFlag_Visited;
+
+	if (type_expr) {
+		Type *t = check_type(c, type_expr);
+		if (!is_type_constant_type(t)) {
+			gbString str = type_to_string(t);
+			error_node(type_expr, "Invalid constant type `%s`", str);
+			gb_string_free(str);
+			e->type = t_invalid;
+			return;
+		}
+		e->type = t;
+	}
+
+	Operand operand = {};
+	if (init != NULL) {
+		check_expr_or_type(c, &operand, init);
+	}
+	if (operand.mode == Addressing_Type) {
+		e->kind = Entity_TypeName;
+
+		DeclInfo *d = c->context.decl;
+		d->type_expr = d->init_expr;
+		check_type_decl(c, e, d->type_expr, named_type);
+		return;
+	}
+
+	check_init_constant(c, e, &operand);
+
+	if (operand.mode == Addressing_Invalid ||
+		base_type(operand.type) == t_invalid) {
+		error(e->token, "Invalid declaration type");
+	}
+}
+
+
+
+bool are_signatures_similar_enough(Type *a_, Type *b_) {
+	GB_ASSERT(a_->kind == Type_Proc);
+	GB_ASSERT(b_->kind == Type_Proc);
+	TypeProc *a = &a_->Proc;
+	TypeProc *b = &b_->Proc;
+
+	if (a->param_count != b->param_count) {
+		return false;
+	}
+	if (a->result_count != b->result_count) {
+		return false;
+	}
+	for (isize i = 0; i < a->param_count; i++) {
+		Type *x = core_type(a->params->Tuple.variables[i]->type);
+		Type *y = core_type(b->params->Tuple.variables[i]->type);
+		if (is_type_pointer(x) && is_type_pointer(y)) {
+			continue;
+		}
+
+		if (is_type_integer(x) && is_type_integer(y)) {
+			GB_ASSERT(x->kind == Type_Basic);
+			GB_ASSERT(y->kind == Type_Basic);
+			if (x->Basic.size == y->Basic.size) {
+				continue;
+			}
+		}
+
+		if (!are_types_identical(x, y)) {
+			return false;
+		}
+	}
+	for (isize i = 0; i < a->result_count; i++) {
+		Type *x = base_type(a->results->Tuple.variables[i]->type);
+		Type *y = base_type(b->results->Tuple.variables[i]->type);
+		if (is_type_pointer(x) && is_type_pointer(y)) {
+			continue;
+		}
+
+		if (is_type_integer(x) && is_type_integer(y)) {
+			GB_ASSERT(x->kind == Type_Basic);
+			GB_ASSERT(y->kind == Type_Basic);
+			if (x->Basic.size == y->Basic.size) {
+				continue;
+			}
+		}
+
+		if (!are_types_identical(x, y)) {
+			return false;
+		}
+	}
+
+	return true;
+}
+
+void check_proc_lit(Checker *c, Entity *e, DeclInfo *d) {
+	GB_ASSERT(e->type == NULL);
+	if (d->proc_lit->kind != AstNode_ProcLit) {
+		// TOOD(bill): Better error message
+		error_node(d->proc_lit, "Expected a procedure to check");
+		return;
+	}
+
+	Type *proc_type = make_type_proc(c->allocator, e->scope, NULL, 0, NULL, 0, false, ProcCC_Odin);
+	e->type = proc_type;
+	ast_node(pd, ProcLit, d->proc_lit);
+
+	check_open_scope(c, pd->type);
+	check_procedure_type(c, proc_type, pd->type);
+
+	bool is_foreign         = (pd->tags & ProcTag_foreign)   != 0;
+	bool is_link_name       = (pd->tags & ProcTag_link_name) != 0;
+	bool is_export          = (pd->tags & ProcTag_export)    != 0;
+	bool is_inline          = (pd->tags & ProcTag_inline)    != 0;
+	bool is_no_inline       = (pd->tags & ProcTag_no_inline) != 0;
+	bool is_require_results = (pd->tags & ProcTag_require_results) != 0;
+
+
+	if (d->scope->is_file && str_eq(e->token.string, str_lit("main"))) {
+		if (proc_type != NULL) {
+			TypeProc *pt = &proc_type->Proc;
+			if (pt->param_count != 0 ||
+			    pt->result_count != 0) {
+				gbString str = type_to_string(proc_type);
+				error(e->token, "Procedure type of `main` was expected to be `proc()`, got %s", str);
+				gb_string_free(str);
+			}
+		}
+	}
+
+	if (is_inline && is_no_inline) {
+		error_node(pd->type, "You cannot apply both `inline` and `no_inline` to a procedure");
+	}
+
+	if (is_foreign && is_link_name) {
+		error_node(pd->type, "You cannot apply both `foreign` and `link_name` to a procedure");
+	} else if (is_foreign && is_export) {
+		error_node(pd->type, "You cannot apply both `foreign` and `export` to a procedure");
+	}
+
+
+	if (pd->body != NULL) {
+		if (is_foreign) {
+			error_node(pd->body, "A procedure tagged as `#foreign` cannot have a body");
+		}
+
+		d->scope = c->context.scope;
+
+		GB_ASSERT(pd->body->kind == AstNode_BlockStmt);
+		check_procedure_later(c, c->curr_ast_file, e->token, d, proc_type, pd->body, pd->tags);
+	}
+
+
+	if (proc_type != NULL && is_type_proc(proc_type)) {
+		TypeProc *tp = &proc_type->Proc;
+		if (tp->result_count == 0 && is_require_results) {
+			error_node(pd->type, "`#require_results` is not needed on a procedure with no results");
+		} else {
+			tp->require_results = is_require_results;
+		}
+	}
+
+	if (is_foreign) {
+		MapEntity *fp = &c->info.foreigns;
+		String name = e->token.string;
+		if (pd->foreign_name.len > 0) {
+			name = pd->foreign_name;
+		}
+
+		AstNode *foreign_library = d->proc_lit->ProcLit.foreign_library;
+		if (foreign_library == NULL) {
+			error(e->token, "#foreign procedures must declare which library they are from");
+		} else if (foreign_library->kind != AstNode_Ident) {
+			error_node(foreign_library, "#foreign library names must be an identifier");
+		} else {
+			String name = foreign_library->Ident.string;
+			Entity *found = scope_lookup_entity(c->context.scope, name);
+			if (found == NULL) {
+				if (str_eq(name, str_lit("_"))) {
+					error_node(foreign_library, "`_` cannot be used as a value type");
+				} else {
+					error_node(foreign_library, "Undeclared name: %.*s", LIT(name));
+				}
+			} else if (found->kind != Entity_LibraryName) {
+				error_node(foreign_library, "`_` cannot be used as a library name");
+			} else {
+				// TODO(bill): Extra stuff to do with library names?
+				e->Procedure.foreign_library = found;
+				add_entity_use(c, foreign_library, found);
+			}
+		}
+
+		e->Procedure.is_foreign = true;
+		e->Procedure.foreign_name = name;
+
+		HashKey key = hash_string(name);
+		Entity **found = map_entity_get(fp, key);
+		if (found) {
+			Entity *f = *found;
+			TokenPos pos = f->token.pos;
+			Type *this_type = base_type(e->type);
+			Type *other_type = base_type(f->type);
+			if (!are_signatures_similar_enough(this_type, other_type)) {
+				error_node(d->proc_lit,
+						   "Redeclaration of #foreign procedure `%.*s` with different type signatures\n"
+						   "\tat %.*s(%td:%td)",
+						   LIT(name), LIT(pos.file), pos.line, pos.column);
+			}
+		} else {
+			map_entity_set(fp, key, e);
+		}
+	} else {
+		String name = e->token.string;
+		if (is_link_name) {
+			name = pd->link_name;
+		}
+
+		if (is_link_name || is_export) {
+			MapEntity *fp = &c->info.foreigns;
+
+			e->Procedure.link_name = name;
+
+			HashKey key = hash_string(name);
+			Entity **found = map_entity_get(fp, key);
+			if (found) {
+				Entity *f = *found;
+				TokenPos pos = f->token.pos;
+				// TODO(bill): Better error message?
+				error_node(d->proc_lit,
+						   "Non unique linking name for procedure `%.*s`\n"
+						   "\tother at %.*s(%td:%td)",
+						   LIT(name), LIT(pos.file), pos.line, pos.column);
+			} else {
+				map_entity_set(fp, key, e);
+			}
+		}
+	}
+
+	check_close_scope(c);
+}
+
+void check_var_decl(Checker *c, Entity *e, Entity **entities, isize entity_count, AstNode *type_expr, AstNode *init_expr) {
+	GB_ASSERT(e->type == NULL);
+	GB_ASSERT(e->kind == Entity_Variable);
+
+	if (e->flags & EntityFlag_Visited) {
+		e->type = t_invalid;
+		return;
+	}
+	e->flags |= EntityFlag_Visited;
+
+	if (type_expr != NULL) {
+		e->type = check_type_extra(c, type_expr, NULL);
+	}
+
+	if (init_expr == NULL) {
+		if (type_expr == NULL) {
+			e->type = t_invalid;
+		}
+		return;
+	}
+
+	if (entities == NULL || entity_count == 1) {
+		GB_ASSERT(entities == NULL || entities[0] == e);
+		Operand operand = {};
+		check_expr(c, &operand, init_expr);
+		check_init_variable(c, e, &operand, str_lit("variable declaration"));
+	}
+
+	if (type_expr != NULL) {
+		for (isize i = 0; i < entity_count; i++) {
+			entities[i]->type = e->type;
+		}
+	}
+
+	AstNodeArray inits;
+	array_init_reserve(&inits, c->allocator, 1);
+	array_add(&inits, init_expr);
+	check_init_variables(c, entities, entity_count, inits, str_lit("variable declaration"));
+}
+
+void check_entity_decl(Checker *c, Entity *e, DeclInfo *d, Type *named_type) {
+	if (e->type != NULL) {
+		return;
+	}
+
+	if (d == NULL) {
+		DeclInfo **found = map_decl_info_get(&c->info.entities, hash_pointer(e));
+		if (found) {
+			d = *found;
+		} else {
+			// TODO(bill): Err here?
+			e->type = t_invalid;
+			set_base_type(named_type, t_invalid);
+			return;
+			// GB_PANIC("`%.*s` should been declared!", LIT(e->token.string));
+		}
+	}
+
+	CheckerContext prev = c->context;
+	c->context.scope = d->scope;
+	c->context.decl  = d;
+
+	e->parent_proc_decl = c->context.curr_proc_decl;
+
+	switch (e->kind) {
+	case Entity_Variable:
+		check_var_decl(c, e, d->entities, d->entity_count, d->type_expr, d->init_expr);
+		break;
+	case Entity_Constant:
+		check_const_decl(c, e, d->type_expr, d->init_expr, named_type);
+		break;
+	case Entity_TypeName:
+		check_type_decl(c, e, d->type_expr, named_type);
+		break;
+	case Entity_Procedure:
+		check_proc_lit(c, e, d);
+		break;
+	}
+
+	c->context = prev;
+}
+
+
+
+void check_proc_body(Checker *c, Token token, DeclInfo *decl, Type *type, AstNode *body) {
+	GB_ASSERT(body->kind == AstNode_BlockStmt);
+
+	String proc_name = {};
+	if (token.kind == Token_Ident) {
+		proc_name = token.string;
+	} else {
+		// TODO(bill): Better name
+		proc_name = str_lit("(anonymous-procedure)");
+	}
+
+	CheckerContext old_context = c->context;
+	c->context.scope = decl->scope;
+	c->context.decl = decl;
+	c->context.proc_name = proc_name;
+	c->context.curr_proc_decl = decl;
+
+	GB_ASSERT(type->kind == Type_Proc);
+	if (type->Proc.param_count > 0) {
+		TypeTuple *params = &type->Proc.params->Tuple;
+		for (isize i = 0; i < params->variable_count; i++) {
+			Entity *e = params->variables[i];
+			GB_ASSERT(e->kind == Entity_Variable);
+			if (!(e->flags & EntityFlag_Using)) {
+				continue;
+			}
+			bool is_immutable = e->Variable.is_immutable;
+			String name = e->token.string;
+			Type *t = base_type(type_deref(e->type));
+			if (is_type_struct(t) || is_type_raw_union(t)) {
+				Scope **found = map_scope_get(&c->info.scopes, hash_pointer(t->Record.node));
+				GB_ASSERT(found != NULL);
+				for_array(i, (*found)->elements.entries) {
+					Entity *f = (*found)->elements.entries.e[i].value;
+					if (f->kind == Entity_Variable) {
+						Entity *uvar = make_entity_using_variable(c->allocator, e, f->token, f->type);
+						uvar->Variable.is_immutable = is_immutable;
+						Entity *prev = scope_insert_entity(c->context.scope, uvar);
+						if (prev != NULL) {
+							error(e->token, "Namespace collision while `using` `%.*s` of: %.*s", LIT(name), LIT(prev->token.string));
+							break;
+						}
+					}
+				}
+			} else {
+				error(e->token, "`using` can only be applied to variables of type struct or raw_union");
+				break;
+			}
+		}
+	}
+
+	push_procedure(c, type);
+	{
+		ast_node(bs, BlockStmt, body);
+		check_stmt_list(c, bs->stmts, Stmt_CheckScopeDecls);
+		if (type->Proc.result_count > 0) {
+			if (!check_is_terminating(body)) {
+				if (token.kind == Token_Ident) {
+					error(bs->close, "Missing return statement at the end of the procedure `%.*s`", LIT(token.string));
+				} else {
+					error(bs->close, "Missing return statement at the end of the procedure");
+				}
+			}
+		}
+	}
+	pop_procedure(c);
+
+
+	check_scope_usage(c, c->context.scope);
+	c->context = old_context;
+
+	if (decl->parent != NULL) {
+		// NOTE(bill): Add the dependencies from the procedure literal (lambda)
+		for_array(i, decl->deps.entries) {
+			HashKey key = decl->deps.entries.e[i].key;
+			Entity *e = cast(Entity *)key.ptr;
+			map_bool_set(&decl->parent->deps, key, true);
+		}
+	}
+}
+
+
+