diff options
Diffstat (limited to 'typecheck.c')
| -rw-r--r-- | typecheck.c | 1578 |
1 files changed, 0 insertions, 1578 deletions
diff --git a/typecheck.c b/typecheck.c deleted file mode 100644 index 0d0690bb..00000000 --- a/typecheck.c +++ /dev/null @@ -1,1578 +0,0 @@ -// Logic for getting a type from an AST node -#include <ctype.h> -#include <gc.h> -#include <glob.h> -#include <signal.h> -#include <stdarg.h> -#include <stdlib.h> -#include <string.h> -#include <sys/stat.h> - -#include "ast.h" -#include "cordhelpers.h" -#include "environment.h" -#include "parse.h" -#include "stdlib/patterns.h" -#include "stdlib/tables.h" -#include "stdlib/text.h" -#include "stdlib/util.h" -#include "typecheck.h" -#include "types.h" - -type_t *parse_type_ast(env_t *env, type_ast_t *ast) -{ -#pragma GCC diagnostic push -#pragma GCC diagnostic ignored "-Wswitch-default" - switch (ast->tag) { - case VarTypeAST: { - const char *name = Match(ast, VarTypeAST)->name; - type_t *t = Table$str_get(*env->types, name); - if (t) return t; - while (strchr(name, '.')) { - char *module_name = GC_strndup(name, strcspn(name, ".")); - binding_t *b = get_binding(env, module_name); - if (!b || b->type->tag != ModuleType) - code_err(ast, "I don't know a module with the name '%s'", module_name); - - env_t *imported = Table$str_get(*env->imports, Match(b->type, ModuleType)->name); - assert(imported); - env = imported; - name = strchr(name, '.') + 1; - t = Table$str_get(*env->types, name); - if (t) return t; - } - code_err(ast, "I don't know a type with the name '%s'", name); - } - case PointerTypeAST: { - auto ptr = Match(ast, PointerTypeAST); - type_t *pointed_t = parse_type_ast(env, ptr->pointed); - if (pointed_t->tag == VoidType) - code_err(ast, "Void pointers are not supported. You probably meant 'Memory' instead of 'Void'"); - return Type(PointerType, .pointed=pointed_t, .is_stack=ptr->is_stack); - } - case ArrayTypeAST: { - type_ast_t *item_type = Match(ast, ArrayTypeAST)->item; - type_t *item_t = parse_type_ast(env, item_type); - if (!item_t) code_err(item_type, "I can't figure out what this type is."); - if (has_stack_memory(item_t)) - code_err(item_type, "Arrays can't have stack references because the array may outlive the stack frame."); - if (type_size(item_t) > ARRAY_MAX_STRIDE) - code_err(ast, "This array holds items that take up %ld bytes, but the maximum supported size is %ld bytes. Consider using an array of pointers instead.", - type_size(item_t), ARRAY_MAX_STRIDE); - return Type(ArrayType, .item_type=item_t); - } - case SetTypeAST: { - type_ast_t *item_type = Match(ast, SetTypeAST)->item; - type_t *item_t = parse_type_ast(env, item_type); - if (!item_t) code_err(item_type, "I can't figure out what this type is."); - if (has_stack_memory(item_t)) - code_err(item_type, "Sets can't have stack references because the array may outlive the stack frame."); - if (type_size(item_t) > ARRAY_MAX_STRIDE) - code_err(ast, "This set holds items that take up %ld bytes, but the maximum supported size is %ld bytes. Consider using an set of pointers instead.", - type_size(item_t), ARRAY_MAX_STRIDE); - return Type(SetType, .item_type=item_t); - } - case TableTypeAST: { - auto table_type = Match(ast, TableTypeAST); - type_ast_t *key_type_ast = table_type->key; - type_t *key_type = parse_type_ast(env, key_type_ast); - if (!key_type) code_err(key_type_ast, "I can't figure out what type this is."); - if (has_stack_memory(key_type)) - code_err(key_type_ast, "Tables can't have stack references because the array may outlive the stack frame."); - if (table_type->value) { - type_t *val_type = parse_type_ast(env, table_type->value); - if (!val_type) code_err(table_type->value, "I can't figure out what type this is."); - if (has_stack_memory(val_type)) - code_err(table_type->value, "Tables can't have stack references because the array may outlive the stack frame."); - else if (val_type->tag == OptionalType) - code_err(ast, "Tables with optional-typed values are not currently supported"); - return Type(TableType, .key_type=key_type, .value_type=val_type, .env=env); - } else if (table_type->default_value) { - type_t *t = Type(TableType, .key_type=key_type, - .value_type=get_type(env, table_type->default_value), .default_value=table_type->default_value, - .env=env); - if (has_stack_memory(t)) - code_err(ast, "Tables can't have stack references because the array may outlive the stack frame."); - return t; - } else { - code_err(ast, "No value type or default value!"); - } - } - case FunctionTypeAST: { - auto fn = Match(ast, FunctionTypeAST); - type_t *ret_t = fn->ret ? parse_type_ast(env, fn->ret) : Type(VoidType); - if (has_stack_memory(ret_t)) - code_err(fn->ret, "Functions are not allowed to return stack references, because the reference may no longer exist on the stack."); - arg_t *type_args = NULL; - for (arg_ast_t *arg = fn->args; arg; arg = arg->next) { - type_args = new(arg_t, .name=arg->name, .next=type_args); - if (arg->type) { - type_args->type = parse_type_ast(env, arg->type); - } else { - type_args->default_val = arg->value; - type_args->type = get_type(env, arg->value); - } - } - REVERSE_LIST(type_args); - return Type(ClosureType, Type(FunctionType, .args=type_args, .ret=ret_t)); - } - case OptionalTypeAST: { - auto opt = Match(ast, OptionalTypeAST); - type_t *t = parse_type_ast(env, opt->type); - if (t->tag == VoidType || t->tag == AbortType || t->tag == ReturnType) - code_err(ast, "Optional %T types are not supported.", t); - else if (t->tag == OptionalType) - code_err(ast, "Nested optional types are not currently supported"); - return Type(OptionalType, .type=t); - } - case MutexedTypeAST: { - type_ast_t *mutexed = Match(ast, MutexedTypeAST)->type; - type_t *t = parse_type_ast(env, mutexed); - if (t->tag == VoidType || t->tag == AbortType || t->tag == ReturnType) - code_err(ast, "Mutexed %T types are not supported.", t); - return Type(MutexedType, .type=t); - } - case UnknownTypeAST: code_err(ast, "I don't know how to get this type"); - } -#pragma GCC diagnostic pop - errx(1, "Unreachable"); -} - -static PUREFUNC bool risks_zero_or_inf(ast_t *ast) -{ - switch (ast->tag) { - case Int: { - const char *str = Match(ast, Int)->str; - OptionalInt_t int_val = Int$from_str(str); - return (int_val.small == 0x1); // zero - } - case Num: { - return Match(ast, Num)->n == 0.0; - } - case BinaryOp: { - auto binop = Match(ast, BinaryOp); - if (binop->op == BINOP_MULT || binop->op == BINOP_DIVIDE || binop->op == BINOP_MIN || binop->op == BINOP_MAX) - return risks_zero_or_inf(binop->lhs) || risks_zero_or_inf(binop->rhs); - else - return true; - } - default: return true; - } -} - -PUREFUNC type_t *get_math_type(env_t *env, ast_t *ast, type_t *lhs_t, type_t *rhs_t) -{ - (void)env; - switch (compare_precision(lhs_t, rhs_t)) { - case NUM_PRECISION_EQUAL: case NUM_PRECISION_MORE: return lhs_t; - case NUM_PRECISION_LESS: return rhs_t; - default: code_err(ast, "Math operations between %T and %T are not supported", lhs_t, rhs_t); - } -} - -static env_t *load_module(env_t *env, ast_t *module_ast) -{ - auto use = Match(module_ast, Use); - switch (use->what) { - case USE_LOCAL: { - const char *resolved_path = resolve_path(use->path, module_ast->file->filename, module_ast->file->filename); - env_t *module_env = Table$str_get(*env->imports, resolved_path); - if (module_env) - return module_env; - - if (!resolved_path) - code_err(module_ast, "No such file exists: \"%s\"", use->path); - - ast_t *ast = parse_file(resolved_path, NULL); - if (!ast) errx(1, "Could not compile file %s", resolved_path); - return load_module_env(env, ast); - } - case USE_MODULE: { - glob_t tm_files; - if (glob(heap_strf("~/.local/share/tomo/installed/%s/[!._0-9]*.tm", use->path), GLOB_TILDE, NULL, &tm_files) != 0) - code_err(module_ast, "Could not find library"); - - env_t *module_env = fresh_scope(env); - Table$str_set(env->imports, use->path, module_env); - char *libname_id = Text$as_c_string( - Text$replace(Text$from_str(use->path), Pattern("{1+ !alphanumeric}"), Text("_"), Pattern(""), false)); - module_env->libname = libname_id; - for (size_t i = 0; i < tm_files.gl_pathc; i++) { - const char *filename = tm_files.gl_pathv[i]; - ast_t *ast = parse_file(filename, NULL); - if (!ast) errx(1, "Could not compile file %s", filename); - env_t *module_file_env = fresh_scope(module_env); - char *file_prefix = file_base_id(filename); - module_file_env->namespace = new(namespace_t, .name=file_prefix); - env_t *subenv = load_module_env(module_file_env, ast); - for (int64_t j = 0; j < subenv->locals->entries.length; j++) { - struct { - const char *name; binding_t *binding; - } *entry = subenv->locals->entries.data + j*subenv->locals->entries.stride; - Table$str_set(module_env->locals, entry->name, entry->binding); - } - } - globfree(&tm_files); - return module_env; - } - default: return NULL; - } -} - -void prebind_statement(env_t *env, ast_t *statement) -{ - switch (statement->tag) { - case DocTest: { - prebind_statement(env, Match(statement, DocTest)->expr); - break; - } - case StructDef: { - auto def = Match(statement, StructDef); - if (get_binding(env, def->name)) - code_err(statement, "A %T called '%s' has already been defined", get_binding(env, def->name)->type, def->name); - - env_t *ns_env = namespace_env(env, def->name); - type_t *type = Type(StructType, .name=def->name, .opaque=true, .external=def->external, .env=ns_env); // placeholder - Table$str_set(env->types, def->name, type); - set_binding(env, def->name, Type(TypeInfoType, .name=def->name, .type=type, .env=ns_env), - CORD_all(namespace_prefix(env, env->namespace), def->name, "$$info")); - for (ast_list_t *stmt = def->namespace ? Match(def->namespace, Block)->statements : NULL; stmt; stmt = stmt->next) - prebind_statement(ns_env, stmt->ast); - break; - } - case EnumDef: { - auto def = Match(statement, EnumDef); - if (get_binding(env, def->name)) - code_err(statement, "A %T called '%s' has already been defined", get_binding(env, def->name)->type, def->name); - - env_t *ns_env = namespace_env(env, def->name); - type_t *type = Type(EnumType, .name=def->name, .opaque=true, .env=ns_env); // placeholder - Table$str_set(env->types, def->name, type); - set_binding(env, def->name, Type(TypeInfoType, .name=def->name, .type=type, .env=ns_env), - CORD_all(namespace_prefix(env, env->namespace), def->name, "$$info")); - for (ast_list_t *stmt = def->namespace ? Match(def->namespace, Block)->statements : NULL; stmt; stmt = stmt->next) - prebind_statement(ns_env, stmt->ast); - break; - } - case LangDef: { - auto def = Match(statement, LangDef); - if (get_binding(env, def->name)) - code_err(statement, "A %T called '%s' has already been defined", get_binding(env, def->name)->type, def->name); - - env_t *ns_env = namespace_env(env, def->name); - type_t *type = Type(TextType, .lang=def->name, .env=ns_env); - Table$str_set(env->types, def->name, type); - set_binding(env, def->name, Type(TypeInfoType, .name=def->name, .type=type, .env=ns_env), - CORD_all(namespace_prefix(env, env->namespace), def->name, "$$info")); - for (ast_list_t *stmt = def->namespace ? Match(def->namespace, Block)->statements : NULL; stmt; stmt = stmt->next) - prebind_statement(ns_env, stmt->ast); - break; - } - default: break; - } -} - -void bind_statement(env_t *env, ast_t *statement) -{ - switch (statement->tag) { - case DocTest: { - bind_statement(env, Match(statement, DocTest)->expr); - break; - } - case Declare: { - auto decl = Match(statement, Declare); - const char *name = Match(decl->var, Var)->name; - if (streq(name, "_")) // Explicit discard - return; - if (get_binding(env, name)) - code_err(decl->var, "A %T called '%s' has already been defined", get_binding(env, name)->type, name); - bind_statement(env, decl->value); - type_t *type = get_type(env, decl->value); - if (!type) - code_err(decl->value, "I couldn't figure out the type of this value"); - if (type->tag == FunctionType) - type = Type(ClosureType, type); - CORD prefix = namespace_prefix(env, env->namespace); - CORD code = CORD_cat(prefix ? prefix : "$", name); - set_binding(env, name, type, code); - break; - } - case FunctionDef: { - auto def = Match(statement, FunctionDef); - const char *name = Match(def->name, Var)->name; - type_t *type = get_function_def_type(env, statement); - // binding_t *clobber = get_binding(env, name); - // if (clobber) - // code_err(def->name, "A %T called '%s' has already been defined", clobber->type, name); - CORD code = CORD_all(namespace_prefix(env, env->namespace), name); - set_binding(env, name, type, code); - break; - } - case ConvertDef: { - type_t *type = get_function_def_type(env, statement); - type_t *ret_t = Match(type, FunctionType)->ret; - const char *name = get_type_name(ret_t); - if (!name) - code_err(statement, "Conversions are only supported for text, struct, and enum types, not %T", ret_t); - - CORD code = CORD_asprintf("%r%r$%ld", namespace_prefix(env, env->namespace), name, - get_line_number(statement->file, statement->start)); - binding_t binding = {.type=type, .code=code}; - env_t *type_ns = get_namespace_by_type(env, ret_t); - Array$insert(&type_ns->namespace->constructors, &binding, I(0), sizeof(binding)); - break; - } - case StructDef: { - auto def = Match(statement, StructDef); - env_t *ns_env = namespace_env(env, def->name); - type_t *type = Table$str_get(*env->types, def->name); - if (!type) code_err(statement, "Couldn't find type!"); - assert(type); - if (!def->opaque) { - arg_t *fields = NULL; - for (arg_ast_t *field_ast = def->fields; field_ast; field_ast = field_ast->next) { - type_t *field_t = get_arg_ast_type(env, field_ast); - type_t *non_opt_field_t = field_t->tag == OptionalType ? Match(field_t, OptionalType)->type : field_t; - if ((non_opt_field_t->tag == StructType && Match(non_opt_field_t, StructType)->opaque) - || (non_opt_field_t->tag == EnumType && Match(non_opt_field_t, EnumType)->opaque)) { - - file_t *file = NULL; - const char *start = NULL, *end = NULL; - if (field_ast->type) { - file = field_ast->type->file, start = field_ast->type->start, end = field_ast->type->end; - } else if (field_ast->value) { - file = field_ast->value->file, start = field_ast->value->start, end = field_ast->value->end; - } - if (non_opt_field_t == type) - compiler_err(file, start, end, "This is a recursive struct that would be infinitely large. Maybe you meant to use an optional '@%T?' pointer instead?", type); - else if (non_opt_field_t->tag == StructType && Match(non_opt_field_t, StructType)->external) - compiler_err(file, start, end, "This is an opaque externally defined struct.\n" - "I can't use it as a member without knowing what its fields are.\n" - "Either specify its fields and remove the `opaque` qualifier, or use something like a @%T pointer.", non_opt_field_t); - else - compiler_err(file, start, end, "I'm still in the process of defining the fields of %T, so I don't know how to use it as a member." - "\nTry using a @%T pointer for this field.", - field_t, field_t); - } - fields = new(arg_t, .name=field_ast->name, .type=field_t, .default_val=field_ast->value, .next=fields); - } - REVERSE_LIST(fields); - type->__data.StructType.fields = fields; // populate placeholder - type->__data.StructType.opaque = false; - } - - for (ast_list_t *stmt = def->namespace ? Match(def->namespace, Block)->statements : NULL; stmt; stmt = stmt->next) - bind_statement(ns_env, stmt->ast); - break; - } - case EnumDef: { - auto def = Match(statement, EnumDef); - env_t *ns_env = namespace_env(env, def->name); - type_t *type = Table$str_get(*env->types, def->name); - assert(type); - tag_t *tags = NULL; - int64_t next_tag = 1; - for (tag_ast_t *tag_ast = def->tags; tag_ast; tag_ast = tag_ast->next) { - arg_t *fields = NULL; - for (arg_ast_t *field_ast = tag_ast->fields; field_ast; field_ast = field_ast->next) { - type_t *field_t = get_arg_ast_type(env, field_ast); - type_t *non_opt_field_t = field_t->tag == OptionalType ? Match(field_t, OptionalType)->type : field_t; - if ((non_opt_field_t->tag == StructType && Match(non_opt_field_t, StructType)->opaque) - || (non_opt_field_t->tag == EnumType && Match(non_opt_field_t, EnumType)->opaque)) { - file_t *file = NULL; - const char *start = NULL, *end = NULL; - if (field_ast->type) { - file = field_ast->type->file, start = field_ast->type->start, end = field_ast->type->end; - } else if (field_ast->value) { - file = field_ast->value->file, start = field_ast->value->start, end = field_ast->value->end; - } - if (non_opt_field_t == type) - compiler_err(file, start, end, "This is a recursive enum that would be infinitely large. Maybe you meant to use an optional '@%T?' pointer instead?", type); - else if (non_opt_field_t->tag == StructType && Match(non_opt_field_t, StructType)->external) - compiler_err(file, start, end, "This is an opaque externally defined struct.\n" - "I can't use it as a member without knowing what its fields are.\n" - "Either specify its fields and remove the `opaque` qualifier, or use something like a @%T pointer.", non_opt_field_t); - else - compiler_err(file, start, end, "I'm still in the process of defining the fields of %T, so I don't know how to use it as a member." - "\nTry using a @%T pointer for this field.", - field_t, field_t); - } - fields = new(arg_t, .name=field_ast->name, .type=field_t, .default_val=field_ast->value, .next=fields); - } - REVERSE_LIST(fields); - env_t *member_ns = namespace_env(env, heap_strf("%s$%s", def->name, tag_ast->name)); - type_t *tag_type = Type(StructType, .name=heap_strf("%s$%s", def->name, tag_ast->name), .fields=fields, .env=member_ns); - tags = new(tag_t, .name=tag_ast->name, .tag_value=(next_tag++), .type=tag_type, .next=tags); - } - REVERSE_LIST(tags); - type->__data.EnumType.tags = tags; - type->__data.EnumType.opaque = false; - - for (tag_t *tag = tags; tag; tag = tag->next) { - if (Match(tag->type, StructType)->fields) { // Constructor: - type_t *constructor_t = Type(FunctionType, .args=Match(tag->type, StructType)->fields, .ret=type); - set_binding(ns_env, tag->name, constructor_t, CORD_all(namespace_prefix(env, env->namespace), def->name, "$tagged$", tag->name)); - } else { // Empty singleton value: - CORD code = CORD_all("((", namespace_prefix(env, env->namespace), def->name, "$$type){", namespace_prefix(env, env->namespace), def->name, "$tag$", tag->name, "})"); - set_binding(ns_env, tag->name, type, code); - } - Table$str_set(env->types, heap_strf("%s$%s", def->name, tag->name), tag->type); - } - - for (ast_list_t *stmt = def->namespace ? Match(def->namespace, Block)->statements : NULL; stmt; stmt = stmt->next) { - bind_statement(ns_env, stmt->ast); - } - break; - } - case LangDef: { - auto def = Match(statement, LangDef); - env_t *ns_env = namespace_env(env, def->name); - type_t *type = Type(TextType, .lang=def->name, .env=ns_env); - Table$str_set(env->types, def->name, type); - - set_binding(ns_env, "from_text", - Type(FunctionType, .args=new(arg_t, .name="text", .type=TEXT_TYPE), .ret=type), - CORD_all("(", namespace_prefix(env, env->namespace), def->name, "$$type)")); - - for (ast_list_t *stmt = def->namespace ? Match(def->namespace, Block)->statements : NULL; stmt; stmt = stmt->next) - bind_statement(ns_env, stmt->ast); - break; - } - case Use: { - env_t *module_env = load_module(env, statement); - if (!module_env) break; - for (Table_t *bindings = module_env->locals; bindings != module_env->globals; bindings = bindings->fallback) { - for (int64_t i = 1; i <= Table$length(*bindings); i++) { - struct {const char *name; binding_t *binding; } *entry = Table$entry(*bindings, i); - if (entry->name[0] == '_' || streq(entry->name, "main")) - continue; - binding_t *b = Table$str_get(*env->locals, entry->name); - if (!b) - Table$str_set(env->locals, entry->name, entry->binding); - else if (b != entry->binding) - code_err(statement, "This module imports a symbol called '%s', which would clobber another variable", entry->name); - } - } - for (int64_t i = 1; i <= Table$length(*module_env->types); i++) { - struct {const char *name; type_t *type; } *entry = Table$entry(*module_env->types, i); - if (entry->name[0] == '_') - continue; - if (Table$str_get(*env->types, entry->name)) - continue; - - Table$str_set(env->types, entry->name, entry->type); - } - - ast_t *var = Match(statement, Use)->var; - if (var) { - type_t *type = get_type(env, statement); - assert(type); - set_binding(env, Match(var, Var)->name, type, CORD_EMPTY); - } - break; - } - case Extern: { - auto ext = Match(statement, Extern); - type_t *t = parse_type_ast(env, ext->type); - if (t->tag == ClosureType) - t = Match(t, ClosureType)->fn; - set_binding(env, ext->name, t, ext->name); - break; - } - default: break; - } -} - -type_t *get_function_def_type(env_t *env, ast_t *ast) -{ - arg_ast_t *arg_asts = ast->tag == FunctionDef ? Match(ast, FunctionDef)->args : Match(ast, ConvertDef)->args; - type_ast_t *ret_type = ast->tag == FunctionDef ? Match(ast, FunctionDef)->ret_type : Match(ast, ConvertDef)->ret_type; - arg_t *args = NULL; - env_t *scope = fresh_scope(env); - for (arg_ast_t *arg = arg_asts; arg; arg = arg->next) { - type_t *t = arg->type ? parse_type_ast(env, arg->type) : get_type(env, arg->value); - args = new(arg_t, .name=arg->name, .type=t, .default_val=arg->value, .next=args); - set_binding(scope, arg->name, t, CORD_EMPTY); - } - REVERSE_LIST(args); - - type_t *ret = ret_type ? parse_type_ast(scope, ret_type) : Type(VoidType); - if (has_stack_memory(ret)) - code_err(ast, "Functions can't return stack references because the reference may outlive its stack frame."); - return Type(FunctionType, .args=args, .ret=ret); -} - -type_t *get_method_type(env_t *env, ast_t *self, const char *name) -{ - binding_t *b = get_namespace_binding(env, self, name); - if (!b || !b->type) - code_err(self, "No such method: %T:%s(...)", get_type(env, self), name); - return b->type; -} - -env_t *when_clause_scope(env_t *env, type_t *subject_t, when_clause_t *clause) -{ - if (clause->pattern->tag == Var || subject_t->tag != EnumType) - return env; - - if (clause->pattern->tag != FunctionCall || Match(clause->pattern, FunctionCall)->fn->tag != Var) - code_err(clause->pattern, "I only support variables and constructors for pattern matching %T types in a 'when' block", subject_t); - - auto fn = Match(clause->pattern, FunctionCall); - const char *tag_name = Match(fn->fn, Var)->name; - type_t *tag_type = NULL; - tag_t * const tags = Match(subject_t, EnumType)->tags; - for (tag_t *tag = tags; tag; tag = tag->next) { - if (streq(tag->name, tag_name)) { - tag_type = tag->type; - break; - } - } - - if (!tag_type) - code_err(clause->pattern, "There is no tag '%s' for the type %T", tag_name, subject_t); - - if (!fn->args) - return env; - - env_t *scope = fresh_scope(env); - auto tag_struct = Match(tag_type, StructType); - if (fn->args && !fn->args->next && tag_struct->fields && tag_struct->fields->next) { - if (fn->args->value->tag != Var) - code_err(fn->args->value, "I expected a variable here"); - set_binding(scope, Match(fn->args->value, Var)->name, tag_type, CORD_EMPTY); - return scope; - } - - arg_t *field = tag_struct->fields; - for (arg_ast_t *var = fn->args; var || field; var = var ? var->next : var) { - if (!var) - code_err(clause->pattern, "The field %T.%s.%s wasn't accounted for", subject_t, tag_name, field->name); - if (!field) - code_err(var->value, "This is one more field than %T has", subject_t); - if (var->value->tag != Var) - code_err(var->value, "I expected this to be a plain variable so I could bind it to a value"); - if (!streq(Match(var->value, Var)->name, "_")) - set_binding(scope, Match(var->value, Var)->name, field->type, CORD_EMPTY); - field = field->next; - } - return scope; -} - -type_t *get_clause_type(env_t *env, type_t *subject_t, when_clause_t *clause) -{ - env_t *scope = when_clause_scope(env, subject_t, clause); - return get_type(scope, clause->body); -} - -type_t *get_type(env_t *env, ast_t *ast) -{ - if (!ast) return NULL; -#pragma GCC diagnostic push -#pragma GCC diagnostic ignored "-Wswitch-default" - switch (ast->tag) { - case None: { - if (!Match(ast, None)->type) - return Type(OptionalType, .type=NULL); - type_t *t = parse_type_ast(env, Match(ast, None)->type); - if (t->tag == OptionalType) - code_err(ast, "Nested optional types are not supported. This should be: `none:%T`", Match(t, OptionalType)->type); - return Type(OptionalType, .type=t); - } - case Bool: { - return Type(BoolType); - } - case Int: { - return Type(BigIntType); - } - case Num: { - return Type(NumType, .bits=TYPE_NBITS64); - } - case HeapAllocate: { - type_t *pointed = get_type(env, Match(ast, HeapAllocate)->value); - if (has_stack_memory(pointed)) - code_err(ast, "Stack references cannot be moved to the heap because they may outlive the stack frame they were created in."); - return Type(PointerType, .pointed=pointed); - } - case StackReference: { - // Supported: - // &variable - // &struct_variable.field.(...) - // &struct_ptr.field.(...) - // &[10, 20, 30]; &{key:value}; &{10, 20, 30} - // &Foo(...) - // &(expression) - // Not supported: - // &ptr[] - // &list[index] - // &table[key] - // &(expression).field - // &optional_struct_ptr.field - ast_t *value = Match(ast, StackReference)->value; - switch (value->tag) { - case FieldAccess: { - ast_t *base = value; - while (base->tag == FieldAccess) - base = Match(base, FieldAccess)->fielded; - - type_t *ref_type = get_type(env, value); - type_t *base_type = get_type(env, base); - if (base_type->tag == OptionalType) { - code_err(base, "This value might be null, so it can't be safely dereferenced"); - } else if (base_type->tag == PointerType) { - auto ptr = Match(base_type, PointerType); - return Type(PointerType, .pointed=ref_type, .is_stack=ptr->is_stack); - } else if (base->tag == Var) { - return Type(PointerType, .pointed=ref_type, .is_stack=true); - } - code_err(ast, "'&' stack references can only be used on the fields of pointers and local variables"); - } - case Index: - code_err(ast, "'&' stack references are not supported for array or table indexing"); - default: - return Type(PointerType, .pointed=get_type(env, value), .is_stack=true); - } - } - case Optional: { - ast_t *value = Match(ast, Optional)->value; - type_t *t = get_type(env, value); - if (t->tag == OptionalType) - code_err(ast, "This value is already optional, it can't be converted to optional"); - return Type(OptionalType, .type=t); - } - case NonOptional: { - ast_t *value = Match(ast, NonOptional)->value; - type_t *t = get_type(env, value); - if (t->tag != OptionalType) - code_err(value, "This value is not optional. Only optional values can use the '!' operator."); - return Match(t, OptionalType)->type; - } - case TextLiteral: return TEXT_TYPE; - case Path: return PATH_TYPE; - case TextJoin: { - const char *lang = Match(ast, TextJoin)->lang; - if (lang) { - binding_t *b = get_binding(env, lang); - if (!b || b->type->tag != TypeInfoType || Match(b->type, TypeInfoType)->type->tag != TextType) - code_err(ast, "There is no text language called '%s'", lang); - return Match(get_binding(env, lang)->type, TypeInfoType)->type; - } else { - return TEXT_TYPE; - } - } - case Var: { - auto var = Match(ast, Var); - binding_t *b = get_binding(env, var->name); - if (b) return b->type; - code_err(ast, "I don't know what \"%s\" refers to", var->name); - } - case Array: { - auto array = Match(ast, Array); - type_t *item_type = NULL; - if (array->item_type) { - item_type = parse_type_ast(env, array->item_type); - } else if (array->items) { - for (ast_list_t *item = array->items; item; item = item->next) { - ast_t *item_ast = item->ast; - env_t *scope = env; - while (item_ast->tag == Comprehension) { - auto comp = Match(item_ast, Comprehension); - scope = for_scope( - scope, FakeAST(For, .iter=comp->iter, .vars=comp->vars)); - item_ast = comp->expr; - } - type_t *t2 = get_type(scope, item_ast); - type_t *merged = item_type ? type_or_type(item_type, t2) : t2; - if (!merged) - code_err(item->ast, - "This array item has type %T, which is different from earlier array items which have type %T", - t2, item_type); - item_type = merged; - } - } else { - code_err(ast, "I can't figure out what type this array has because it has no members or explicit type"); - } - if (has_stack_memory(item_type)) - code_err(ast, "Arrays cannot hold stack references, because the array may outlive the stack frame the reference was created in."); - return Type(ArrayType, .item_type=item_type); - } - case Set: { - auto set = Match(ast, Set); - type_t *item_type = NULL; - if (set->item_type) { - item_type = parse_type_ast(env, set->item_type); - } else { - for (ast_list_t *item = set->items; item; item = item->next) { - ast_t *item_ast = item->ast; - env_t *scope = env; - while (item_ast->tag == Comprehension) { - auto comp = Match(item_ast, Comprehension); - scope = for_scope( - scope, FakeAST(For, .iter=comp->iter, .vars=comp->vars)); - item_ast = comp->expr; - } - - type_t *this_item_type = get_type(scope, item_ast); - type_t *item_merged = type_or_type(item_type, this_item_type); - if (!item_merged) - code_err(item_ast, - "This set item has type %T, which is different from earlier set items which have type %T", - this_item_type, item_type); - item_type = item_merged; - } - } - if (has_stack_memory(item_type)) - code_err(ast, "Sets cannot hold stack references because the set may outlive the reference's stack frame."); - return Type(SetType, .item_type=item_type); - } - case Table: { - auto table = Match(ast, Table); - type_t *key_type = NULL, *value_type = NULL; - if (table->key_type && table->value_type) { - key_type = parse_type_ast(env, table->key_type); - value_type = parse_type_ast(env, table->value_type); - } else if (table->key_type && table->default_value) { - key_type = parse_type_ast(env, table->key_type); - value_type = get_type(env, table->default_value); - } else { - for (ast_list_t *entry = table->entries; entry; entry = entry->next) { - ast_t *entry_ast = entry->ast; - env_t *scope = env; - while (entry_ast->tag == Comprehension) { - auto comp = Match(entry_ast, Comprehension); - scope = for_scope( - scope, FakeAST(For, .iter=comp->iter, .vars=comp->vars)); - entry_ast = comp->expr; - } - - auto e = Match(entry_ast, TableEntry); - type_t *key_t = get_type(scope, e->key); - type_t *value_t = get_type(scope, e->value); - - type_t *key_merged = key_type ? type_or_type(key_type, key_t) : key_t; - if (!key_merged) - code_err(entry->ast, - "This table entry has type %T, which is different from earlier table entries which have type %T", - key_t, key_type); - key_type = key_merged; - - type_t *val_merged = value_type ? type_or_type(value_type, value_t) : value_t; - if (!val_merged) - code_err(entry->ast, - "This table entry has type %T, which is different from earlier table entries which have type %T", - value_t, value_type); - value_type = val_merged; - } - } - if (has_stack_memory(key_type) || has_stack_memory(value_type)) - code_err(ast, "Tables cannot hold stack references because the table may outlive the reference's stack frame."); - return Type(TableType, .key_type=key_type, .value_type=value_type, .default_value=table->default_value, .env=env); - } - case TableEntry: { - code_err(ast, "Table entries should not be typechecked directly"); - } - case Comprehension: { - auto comp = Match(ast, Comprehension); - env_t *scope = for_scope(env, FakeAST(For, .iter=comp->iter, .vars=comp->vars)); - if (comp->expr->tag == Comprehension) { - return get_type(scope, comp->expr); - } else if (comp->expr->tag == TableEntry) { - auto e = Match(comp->expr, TableEntry); - return Type(TableType, .key_type=get_type(scope, e->key), .value_type=get_type(scope, e->value), .env=env); - } else { - return Type(ArrayType, .item_type=get_type(scope, comp->expr)); - } - } - case FieldAccess: { - auto access = Match(ast, FieldAccess); - type_t *fielded_t = get_type(env, access->fielded); - if (fielded_t->tag == ModuleType) { - const char *name = Match(fielded_t, ModuleType)->name; - env_t *module_env = Table$str_get(*env->imports, name); - if (!module_env) code_err(access->fielded, "I couldn't find the environment for the module %s", name); - return get_type(module_env, WrapAST(ast, Var, access->field)); - } else if (fielded_t->tag == TypeInfoType) { - auto info = Match(fielded_t, TypeInfoType); - assert(info->env); - binding_t *b = get_binding(info->env, access->field); - if (!b) code_err(ast, "I couldn't find the field '%s' on this type", access->field); - return b->type; - } - type_t *field_t = get_field_type(fielded_t, access->field); - if (!field_t) - code_err(ast, "%T objects don't have a field called '%s'", fielded_t, access->field); - return field_t; - } - case Index: { - auto indexing = Match(ast, Index); - type_t *indexed_t = get_type(env, indexing->indexed); - if (indexed_t->tag == OptionalType && !indexing->index) - code_err(ast, "You're attempting to dereference a value whose type indicates it could be null"); - - if (indexed_t->tag == PointerType && !indexing->index) - return Match(indexed_t, PointerType)->pointed; - - type_t *value_t = value_type(indexed_t); - if (value_t->tag == ArrayType) { - if (!indexing->index) return indexed_t; - type_t *index_t = get_type(env, indexing->index); - if (index_t->tag == IntType || index_t->tag == BigIntType || index_t->tag == ByteType) - return Match(value_t, ArrayType)->item_type; - code_err(indexing->index, "I only know how to index lists using integers, not %T", index_t); - } else if (value_t->tag == TableType) { - auto table_type = Match(value_t, TableType); - if (table_type->default_value) - return get_type(env, table_type->default_value); - else if (table_type->value_type) - return Type(OptionalType, table_type->value_type); - else - code_err(indexing->indexed, "This type doesn't have a value type or a default value"); - } else if (value_t->tag == TextType) { - return value_t; - } else { - code_err(ast, "I don't know how to index %T values", indexed_t); - } - } - case FunctionCall: { - auto call = Match(ast, FunctionCall); - type_t *fn_type_t = get_type(env, call->fn); - if (!fn_type_t) - code_err(call->fn, "I couldn't find this function"); - - if (fn_type_t->tag == TypeInfoType) { - type_t *t = Match(fn_type_t, TypeInfoType)->type; - - binding_t *constructor = get_constructor(env, t, call->args); - if (constructor) - return t; - else if (t->tag == StructType || t->tag == IntType || t->tag == BigIntType || t->tag == NumType - || t->tag == ByteType || t->tag == TextType || t->tag == CStringType || t->tag == MomentType) - return t; // Constructor - code_err(call->fn, "This is not a type that has a constructor"); - } - if (fn_type_t->tag == ClosureType) - fn_type_t = Match(fn_type_t, ClosureType)->fn; - if (fn_type_t->tag != FunctionType) - code_err(call->fn, "This isn't a function, it's a %T", fn_type_t); - auto fn_type = Match(fn_type_t, FunctionType); - return fn_type->ret; - } - case MethodCall: { - auto call = Match(ast, MethodCall); - - if (streq(call->name, "serialized")) // Data serialization - return Type(ArrayType, Type(ByteType)); - - type_t *self_value_t = value_type(get_type(env, call->self)); - switch (self_value_t->tag) { - case ArrayType: { - type_t *item_type = Match(self_value_t, ArrayType)->item_type; - if (streq(call->name, "binary_search")) return INT_TYPE; - else if (streq(call->name, "by")) return self_value_t; - else if (streq(call->name, "clear")) return Type(VoidType); - else if (streq(call->name, "counts")) return Type(TableType, .key_type=item_type, .value_type=INT_TYPE); - else if (streq(call->name, "find")) return Type(OptionalType, .type=INT_TYPE); - else if (streq(call->name, "first")) return Type(OptionalType, .type=INT_TYPE); - else if (streq(call->name, "from")) return self_value_t; - else if (streq(call->name, "has")) return Type(BoolType); - else if (streq(call->name, "heap_pop")) return Type(OptionalType, .type=item_type); - else if (streq(call->name, "heap_push")) return Type(VoidType); - else if (streq(call->name, "heapify")) return Type(VoidType); - else if (streq(call->name, "insert")) return Type(VoidType); - else if (streq(call->name, "insert_all")) return Type(VoidType); - else if (streq(call->name, "pop")) return Type(OptionalType, .type=item_type); - else if (streq(call->name, "random")) return item_type; - else if (streq(call->name, "remove_at")) return Type(VoidType); - else if (streq(call->name, "remove_item")) return Type(VoidType); - else if (streq(call->name, "reversed")) return self_value_t; - else if (streq(call->name, "sample")) return self_value_t; - else if (streq(call->name, "shuffle")) return Type(VoidType); - else if (streq(call->name, "shuffled")) return self_value_t; - else if (streq(call->name, "slice")) return self_value_t; - else if (streq(call->name, "sort")) return Type(VoidType); - else if (streq(call->name, "sorted")) return self_value_t; - else if (streq(call->name, "to")) return self_value_t; - else if (streq(call->name, "unique")) return Type(SetType, .item_type=item_type); - else code_err(ast, "There is no '%s' method for arrays", call->name); - } - case SetType: { - if (streq(call->name, "add")) return Type(VoidType); - else if (streq(call->name, "add_all")) return Type(VoidType); - else if (streq(call->name, "clear")) return Type(VoidType); - else if (streq(call->name, "has")) return Type(BoolType); - else if (streq(call->name, "is_subset_of")) return Type(BoolType); - else if (streq(call->name, "is_superset_of")) return Type(BoolType); - else if (streq(call->name, "overlap")) return self_value_t; - else if (streq(call->name, "remove")) return Type(VoidType); - else if (streq(call->name, "remove_all")) return Type(VoidType); - else if (streq(call->name, "with")) return self_value_t; - else if (streq(call->name, "without")) return self_value_t; - else code_err(ast, "There is no '%s' method for sets", call->name); - } - case TableType: { - auto table = Match(self_value_t, TableType); - if (streq(call->name, "bump")) return Type(VoidType); - else if (streq(call->name, "clear")) return Type(VoidType); - else if (streq(call->name, "get")) return Type(OptionalType, .type=table->value_type); - else if (streq(call->name, "has")) return Type(BoolType); - else if (streq(call->name, "remove")) return Type(VoidType); - else if (streq(call->name, "set")) return Type(VoidType); - else if (streq(call->name, "sorted")) return self_value_t; - code_err(ast, "There is no '%s' method for %T tables", call->name, self_value_t); - } - default: { - type_t *fn_type_t = get_method_type(env, call->self, call->name); - if (!fn_type_t) - code_err(ast, "No such method!"); - if (fn_type_t->tag != FunctionType) - code_err(ast, "This isn't a method, it's a %T", fn_type_t); - auto fn_type = Match(fn_type_t, FunctionType); - return fn_type->ret; - } - } - } - case Block: { - auto block = Match(ast, Block); - ast_list_t *last = block->statements; - if (!last) - return Type(VoidType); - while (last->next) - last = last->next; - - // Early out if the type is knowable without any context from the block: - switch (last->ast->tag) { - case UpdateAssign: case Assign: case Declare: case FunctionDef: case ConvertDef: case StructDef: case EnumDef: case LangDef: - return Type(VoidType); - default: break; - } - - env_t *block_env = fresh_scope(env); - for (ast_list_t *stmt = block->statements; stmt; stmt = stmt->next) { - prebind_statement(block_env, stmt->ast); - } - for (ast_list_t *stmt = block->statements; stmt; stmt = stmt->next) { - bind_statement(block_env, stmt->ast); - if (stmt->next) { // Check for unreachable code: - if (stmt->ast->tag == Return) - code_err(stmt->ast, "This statement will always return, so the rest of the code in this block is unreachable!"); - type_t *statement_type = get_type(block_env, stmt->ast); - if (statement_type && statement_type->tag == AbortType && stmt->next) - code_err(stmt->ast, "This statement will always abort, so the rest of the code in this block is unreachable!"); - } - } - return get_type(block_env, last->ast); - } - case Extern: { - return parse_type_ast(env, Match(ast, Extern)->type); - } - case Declare: case Assign: case DocTest: { - return Type(VoidType); - } - case Use: { - switch (Match(ast, Use)->what) { - case USE_LOCAL: - return Type(ModuleType, resolve_path(Match(ast, Use)->path, ast->file->filename, ast->file->filename)); - default: - return Type(ModuleType, Match(ast, Use)->path); - } - } - case Return: { - ast_t *val = Match(ast, Return)->value; - if (env->fn_ret) - env = with_enum_scope(env, env->fn_ret); - return Type(ReturnType, .ret=(val ? get_type(env, val) : Type(VoidType))); - } - case Stop: case Skip: { - return Type(AbortType); - } - case Pass: case Defer: case PrintStatement: return Type(VoidType); - case Negative: { - ast_t *value = Match(ast, Negative)->value; - type_t *t = get_type(env, value); - if (t->tag == IntType || t->tag == NumType) - return t; - - binding_t *b = get_namespace_binding(env, value, "negative"); - if (b && b->type->tag == FunctionType) { - auto fn = Match(b->type, FunctionType); - if (fn->args && type_eq(t, get_arg_type(env, fn->args)) && type_eq(t, fn->ret)) - return t; - } - - code_err(ast, "I don't know how to get the negative value of type %T", t); - } - case Not: { - type_t *t = get_type(env, Match(ast, Not)->value); - if (t->tag == IntType || t->tag == NumType || t->tag == BoolType) - return t; - if (t->tag == OptionalType) - return Type(BoolType); - - ast_t *value = Match(ast, Not)->value; - binding_t *b = get_namespace_binding(env, value, "negated"); - if (b && b->type->tag == FunctionType) { - auto fn = Match(b->type, FunctionType); - if (fn->args && type_eq(t, get_arg_type(env, fn->args)) && type_eq(t, fn->ret)) - return t; - } - code_err(ast, "I only know how to get 'not' of boolean, numeric, and optional pointer types, not %T", t); - } - case Mutexed: { - type_t *item_type = get_type(env, Match(ast, Mutexed)->value); - return Type(MutexedType, .type=item_type); - } - case Holding: { - ast_t *held = Match(ast, Holding)->mutexed; - type_t *held_type = get_type(env, held); - if (held_type->tag != MutexedType) - code_err(held, "This is a %t, not a mutexed value", held_type); - if (held->tag == Var) { - env = fresh_scope(env); - set_binding(env, Match(held, Var)->name, Type(PointerType, .pointed=Match(held_type, MutexedType)->type, .is_stack=true), CORD_EMPTY); - } - return get_type(env, Match(ast, Holding)->body); - } - case BinaryOp: { - auto binop = Match(ast, BinaryOp); - type_t *lhs_t = get_type(env, binop->lhs), - *rhs_t = get_type(env, binop->rhs); - - if (lhs_t->tag == BigIntType && rhs_t->tag != BigIntType && is_numeric_type(rhs_t) && binop->lhs->tag == Int) { - lhs_t = rhs_t; - } else if (rhs_t->tag == BigIntType && lhs_t->tag != BigIntType && is_numeric_type(lhs_t) && binop->rhs->tag == Int) { - - rhs_t = lhs_t; - } - -#define binding_works(name, self, lhs_t, rhs_t, ret_t) \ - ({ binding_t *b = get_namespace_binding(env, self, name); \ - (b && b->type->tag == FunctionType && ({ auto fn = Match(b->type, FunctionType); \ - (type_eq(fn->ret, ret_t) \ - && (fn->args && type_eq(fn->args->type, lhs_t)) \ - && (fn->args->next && can_promote(rhs_t, fn->args->next->type))); })); }) - // Check for a binop method like plus() etc: - switch (binop->op) { - case BINOP_MULT: { - if (is_numeric_type(lhs_t) && binding_works("scaled_by", binop->rhs, rhs_t, lhs_t, rhs_t)) - return rhs_t; - else if (is_numeric_type(rhs_t) && binding_works("scaled_by", binop->lhs, lhs_t, rhs_t, lhs_t)) - return lhs_t; - else if (type_eq(lhs_t, rhs_t) && binding_works(binop_method_names[binop->op], binop->lhs, lhs_t, rhs_t, lhs_t)) - return lhs_t; - break; - } - case BINOP_PLUS: case BINOP_MINUS: case BINOP_AND: case BINOP_OR: case BINOP_XOR: case BINOP_CONCAT: { - if (type_eq(lhs_t, rhs_t) && binding_works(binop_method_names[binop->op], binop->lhs, lhs_t, rhs_t, lhs_t)) - return lhs_t; - break; - } - case BINOP_DIVIDE: case BINOP_MOD: case BINOP_MOD1: { - if (is_numeric_type(rhs_t) && binding_works(binop_method_names[binop->op], binop->lhs, lhs_t, rhs_t, lhs_t)) - return lhs_t; - break; - } - case BINOP_LSHIFT: case BINOP_RSHIFT: case BINOP_ULSHIFT: case BINOP_URSHIFT: { - return lhs_t; - } - case BINOP_POWER: { - if (is_numeric_type(rhs_t) && binding_works(binop_method_names[binop->op], binop->lhs, lhs_t, rhs_t, lhs_t)) - return lhs_t; - break; - } - default: break; - } -#undef binding_works - - switch (binop->op) { - case BINOP_AND: { - if (lhs_t->tag == BoolType && rhs_t->tag == BoolType) { - return lhs_t; - } else if ((lhs_t->tag == BoolType && rhs_t->tag == OptionalType) || - (lhs_t->tag == OptionalType && rhs_t->tag == BoolType)) { - return Type(BoolType); - } else if (lhs_t->tag == BoolType && (rhs_t->tag == AbortType || rhs_t->tag == ReturnType)) { - return lhs_t; - } else if (rhs_t->tag == AbortType || rhs_t->tag == ReturnType) { - return lhs_t; - } else if (rhs_t->tag == OptionalType) { - if (can_promote(lhs_t, rhs_t)) - return rhs_t; - } else if (lhs_t->tag == PointerType && rhs_t->tag == PointerType) { - auto lhs_ptr = Match(lhs_t, PointerType); - auto rhs_ptr = Match(rhs_t, PointerType); - if (type_eq(lhs_ptr->pointed, rhs_ptr->pointed)) - return Type(PointerType, .pointed=lhs_ptr->pointed); - } else if ((is_int_type(lhs_t) && is_int_type(rhs_t)) - || (lhs_t->tag == ByteType && rhs_t->tag == ByteType)) { - return get_math_type(env, ast, lhs_t, rhs_t); - } - code_err(ast, "I can't figure out the type of this `and` expression between a %T and a %T", lhs_t, rhs_t); - } - case BINOP_OR: { - if (lhs_t->tag == BoolType && rhs_t->tag == BoolType) { - return lhs_t; - } else if ((lhs_t->tag == BoolType && rhs_t->tag == OptionalType) || - (lhs_t->tag == OptionalType && rhs_t->tag == BoolType)) { - return Type(BoolType); - } else if (lhs_t->tag == BoolType && (rhs_t->tag == AbortType || rhs_t->tag == ReturnType)) { - return lhs_t; - } else if ((is_int_type(lhs_t) && is_int_type(rhs_t)) - || (lhs_t->tag == ByteType && rhs_t->tag == ByteType)) { - return get_math_type(env, ast, lhs_t, rhs_t); - } else if (lhs_t->tag == OptionalType) { - if (rhs_t->tag == AbortType || rhs_t->tag == ReturnType) - return Match(lhs_t, OptionalType)->type; - if (can_promote(rhs_t, lhs_t)) - return rhs_t; - } else if (lhs_t->tag == PointerType) { - auto lhs_ptr = Match(lhs_t, PointerType); - if (rhs_t->tag == AbortType || rhs_t->tag == ReturnType) { - return Type(PointerType, .pointed=lhs_ptr->pointed); - } else if (rhs_t->tag == PointerType) { - auto rhs_ptr = Match(rhs_t, PointerType); - if (type_eq(rhs_ptr->pointed, lhs_ptr->pointed)) - return Type(PointerType, .pointed=lhs_ptr->pointed); - } - } else if (rhs_t->tag == OptionalType) { - return type_or_type(lhs_t, rhs_t); - } - code_err(ast, "I can't figure out the type of this `or` expression between a %T and a %T", lhs_t, rhs_t); - } - case BINOP_XOR: { - if (lhs_t->tag == BoolType && rhs_t->tag == BoolType) { - return lhs_t; - } else if ((lhs_t->tag == BoolType && rhs_t->tag == OptionalType) || - (lhs_t->tag == OptionalType && rhs_t->tag == BoolType)) { - return Type(BoolType); - } else if ((is_int_type(lhs_t) && is_int_type(rhs_t)) - || (lhs_t->tag == ByteType && rhs_t->tag == ByteType)) { - return get_math_type(env, ast, lhs_t, rhs_t); - } - - code_err(ast, "I can't figure out the type of this `xor` expression between a %T and a %T", lhs_t, rhs_t); - } - case BINOP_CONCAT: { - if (!type_eq(lhs_t, rhs_t)) - code_err(ast, "The type on the left side of this concatenation doesn't match the right side: %T vs. %T", - lhs_t, rhs_t); - if (lhs_t->tag == ArrayType || lhs_t->tag == TextType || lhs_t->tag == SetType) - return lhs_t; - - code_err(ast, "Only array/set/text value types support concatenation, not %T", lhs_t); - } - case BINOP_EQ: case BINOP_NE: case BINOP_LT: case BINOP_LE: case BINOP_GT: case BINOP_GE: { - if (!can_promote(lhs_t, rhs_t) && !can_promote(rhs_t, lhs_t)) - code_err(ast, "I can't compare these two different types: %T vs %T", lhs_t, rhs_t); - return Type(BoolType); - } - case BINOP_CMP: - return Type(IntType, .bits=TYPE_IBITS32); - case BINOP_POWER: { - type_t *result = get_math_type(env, ast, lhs_t, rhs_t); - if (result->tag == NumType) - return result; - return Type(NumType, .bits=TYPE_NBITS64); - } - case BINOP_MULT: case BINOP_DIVIDE: { - type_t *math_type = get_math_type(env, ast, value_type(lhs_t), value_type(rhs_t)); - if (value_type(lhs_t)->tag == NumType || value_type(rhs_t)->tag == NumType) { - if (risks_zero_or_inf(binop->lhs) && risks_zero_or_inf(binop->rhs)) - return Type(OptionalType, math_type); - else - return math_type; - } - return math_type; - } - default: { - return get_math_type(env, ast, lhs_t, rhs_t); - } - } - } - - case Reduction: { - auto reduction = Match(ast, Reduction); - type_t *iter_t = get_type(env, reduction->iter); - - if (reduction->op == BINOP_EQ || reduction->op == BINOP_NE || reduction->op == BINOP_LT - || reduction->op == BINOP_LE || reduction->op == BINOP_GT || reduction->op == BINOP_GE) - return Type(OptionalType, .type=Type(BoolType)); - - type_t *iterated = get_iterated_type(iter_t); - if (!iterated) - code_err(reduction->iter, "I don't know how to do a reduction over %T values", iter_t); - return iterated->tag == OptionalType ? iterated : Type(OptionalType, .type=iterated); - } - - case UpdateAssign: - return Type(VoidType); - - case Min: case Max: { - // Unsafe! These types *should* have the same fields and this saves a lot of duplicate code: - ast_t *lhs = ast->__data.Min.lhs, *rhs = ast->__data.Min.rhs; - // Okay safe again - - type_t *lhs_t = get_type(env, lhs), *rhs_t = get_type(env, rhs); - type_t *t = type_or_type(lhs_t, rhs_t); - if (!t) - code_err(ast, "The two sides of this operation are not compatible: %T vs %T", lhs_t, rhs_t); - return t; - } - - case Lambda: { - auto lambda = Match(ast, Lambda); - arg_t *args = NULL; - env_t *scope = fresh_scope(env); // For now, just use closed variables in scope normally - for (arg_ast_t *arg = lambda->args; arg; arg = arg->next) { - type_t *t = get_arg_ast_type(env, arg); - args = new(arg_t, .name=arg->name, .type=t, .next=args); - set_binding(scope, arg->name, t, CORD_EMPTY); - } - REVERSE_LIST(args); - - type_t *ret = get_type(scope, lambda->body); - if (ret->tag == ReturnType) - ret = Match(ret, ReturnType)->ret; - if (ret->tag == AbortType) - ret = Type(VoidType); - - if (ret->tag == OptionalType && !Match(ret, OptionalType)->type) - code_err(lambda->body, "This function doesn't return a specific optional type"); - - if (lambda->ret_type) { - type_t *declared = parse_type_ast(env, lambda->ret_type); - if (can_promote(ret, declared)) - ret = declared; - else - code_err(ast, "This function was declared to return a value of type %T, but actually returns a value of type %T", - declared, ret); - } - - if (has_stack_memory(ret)) - code_err(ast, "Functions can't return stack references because the reference may outlive its stack frame."); - return Type(ClosureType, Type(FunctionType, .args=args, .ret=ret)); - } - - case FunctionDef: case ConvertDef: case StructDef: case EnumDef: case LangDef: { - return Type(VoidType); - } - - case If: { - auto if_ = Match(ast, If); - if (!if_->else_body) - return Type(VoidType); - - env_t *truthy_scope = env; - env_t *falsey_scope = env; - if (if_->condition->tag == Declare) { - type_t *condition_type = get_type(env, Match(if_->condition, Declare)->value); - const char *varname = Match(Match(if_->condition, Declare)->var, Var)->name; - if (streq(varname, "_")) - code_err(if_->condition, "To use `if var := ...:`, you must choose a real variable name, not `_`"); - - truthy_scope = fresh_scope(env); - if (condition_type->tag == OptionalType) - set_binding(truthy_scope, varname, - Match(condition_type, OptionalType)->type, CORD_EMPTY); - else - set_binding(truthy_scope, varname, condition_type, CORD_EMPTY); - } else if (if_->condition->tag == Var) { - type_t *condition_type = get_type(env, if_->condition); - if (condition_type->tag == OptionalType) { - truthy_scope = fresh_scope(env); - const char *varname = Match(if_->condition, Var)->name; - set_binding(truthy_scope, varname, - Match(condition_type, OptionalType)->type, CORD_EMPTY); - } - } - - type_t *true_t = get_type(truthy_scope, if_->body); - type_t *false_t = get_type(falsey_scope, if_->else_body); - type_t *t_either = type_or_type(true_t, false_t); - if (!t_either) - code_err(if_->else_body, - "I was expecting this block to have a %T value (based on earlier clauses), but it actually has a %T value.", - true_t, false_t); - return t_either; - } - - case When: { - auto when = Match(ast, When); - type_t *subject_t = get_type(env, when->subject); - if (subject_t->tag != EnumType) { - type_t *t = NULL; - for (when_clause_t *clause = when->clauses; clause; clause = clause->next) { - t = type_or_type(t, get_type(env, clause->body)); - } - if (when->else_body) - t = type_or_type(t, get_type(env, when->else_body)); - else if (t->tag != OptionalType) - t = Type(OptionalType, .type=t); - return t; - } - - type_t *overall_t = NULL; - tag_t * const tags = Match(subject_t, EnumType)->tags; - - typedef struct match_s { - tag_t *tag; - bool handled; - struct match_s *next; - } match_t; - match_t *matches = NULL; - for (tag_t *tag = tags; tag; tag = tag->next) - matches = new(match_t, .tag=tag, .handled=false, .next=matches); - - for (when_clause_t *clause = when->clauses; clause; clause = clause->next) { - const char *tag_name; - if (clause->pattern->tag == Var) - tag_name = Match(clause->pattern, Var)->name; - else if (clause->pattern->tag == FunctionCall && Match(clause->pattern, FunctionCall)->fn->tag == Var) - tag_name = Match(Match(clause->pattern, FunctionCall)->fn, Var)->name; - else - code_err(clause->pattern, "This is not a valid pattern for a %T enum", subject_t); - - CORD valid_tags = CORD_EMPTY; - for (match_t *m = matches; m; m = m->next) { - if (streq(m->tag->name, tag_name)) { - if (m->handled) - code_err(clause->pattern, "This tag was already handled earlier"); - m->handled = true; - goto found_matching_tag; - } - if (valid_tags) valid_tags = CORD_cat(valid_tags, ", "); - valid_tags = CORD_cat(valid_tags, m->tag->name); - } - - code_err(clause->pattern, "There is no tag '%s' for the type %T (valid tags: %s)", - tag_name, subject_t, CORD_to_char_star(valid_tags)); - found_matching_tag:; - } - - for (when_clause_t *clause = when->clauses; clause; clause = clause->next) { - env_t *clause_scope = when_clause_scope(env, subject_t, clause); - type_t *clause_type = get_type(clause_scope, clause->body); - type_t *merged = type_or_type(overall_t, clause_type); - if (!merged) - code_err(clause->body, "The type of this branch is %T, which conflicts with the earlier branch type of %T", - clause_type, overall_t); - overall_t = merged; - } - - if (when->else_body) { - bool any_unhandled = false; - for (match_t *m = matches; m; m = m->next) { - if (!m->handled) { - any_unhandled = true; - break; - } - } - // HACK: `while when ...` is handled by the parser adding an implicit - // `else: stop`, which has an empty source code span. - if (!any_unhandled && when->else_body->end > when->else_body->start) - code_err(when->else_body, "This 'else' block will never run because every tag is handled"); - - type_t *else_t = get_type(env, when->else_body); - type_t *merged = type_or_type(overall_t, else_t); - if (!merged) - code_err(when->else_body, - "I was expecting this block to have a %T value (based on earlier clauses), but it actually has a %T value.", - overall_t, else_t); - return merged; - } else { - CORD unhandled = CORD_EMPTY; - for (match_t *m = matches; m; m = m->next) { - if (!m->handled) - unhandled = unhandled ? CORD_all(unhandled, ", ", m->tag->name) : m->tag->name; - } - if (unhandled) - code_err(ast, "This 'when' statement doesn't handle the tags: %s", CORD_to_const_char_star(unhandled)); - return overall_t; - } - } - - case While: case Repeat: case For: return Type(VoidType); - case InlineCCode: { - auto inline_code = Match(ast, InlineCCode); - if (inline_code->type) - return inline_code->type; - type_ast_t *type_ast = inline_code->type_ast; - return type_ast ? parse_type_ast(env, type_ast) : Type(VoidType); - } - case Moment: return Type(MomentType); - case Unknown: code_err(ast, "I can't figure out the type of: %W", ast); - case Deserialize: return parse_type_ast(env, Match(ast, Deserialize)->type); - } -#pragma GCC diagnostic pop - code_err(ast, "I can't figure out the type of: %W", ast); -} - -PUREFUNC bool is_discardable(env_t *env, ast_t *ast) -{ - switch (ast->tag) { - case UpdateAssign: case Assign: case Declare: case FunctionDef: case ConvertDef: case StructDef: case EnumDef: - case LangDef: case Use: - return true; - default: break; - } - type_t *t = get_type(env, ast); - return (t->tag == VoidType || t->tag == AbortType || t->tag == ReturnType); -} - -type_t *get_arg_ast_type(env_t *env, arg_ast_t *arg) -{ - assert(arg->type || arg->value); - if (arg->type) - return parse_type_ast(env, arg->type); - return get_type(env, arg->value); -} - -type_t *get_arg_type(env_t *env, arg_t *arg) -{ - assert(arg->type || arg->default_val); - if (arg->type) return arg->type; - return get_type(env, arg->default_val); -} - -Table_t *get_arg_bindings(env_t *env, arg_t *spec_args, arg_ast_t *call_args, bool promotion_allowed) -{ - Table_t used_args = {}; - - // Populate keyword args: - for (arg_ast_t *call_arg = call_args; call_arg; call_arg = call_arg->next) { - if (!call_arg->name) continue; - - type_t *call_type = get_arg_ast_type(env, call_arg); - for (arg_t *spec_arg = spec_args; spec_arg; spec_arg = spec_arg->next) { - if (!streq(call_arg->name, spec_arg->name)) continue; - type_t *spec_type = get_arg_type(env, spec_arg); - if (!(type_eq(call_type, spec_type) || (promotion_allowed && can_promote(call_type, spec_type)) - || (promotion_allowed && call_arg->value->tag == Int && is_numeric_type(spec_type)) - || (promotion_allowed && call_arg->value->tag == Num && spec_type->tag == NumType))) - return NULL; - Table$str_set(&used_args, call_arg->name, call_arg); - goto next_call_arg; - } - return NULL; - next_call_arg:; - } - - arg_ast_t *unused_args = call_args; - for (arg_t *spec_arg = spec_args; spec_arg; spec_arg = spec_arg->next) { - arg_ast_t *keyworded = Table$str_get(used_args, spec_arg->name); - if (keyworded) continue; - - type_t *spec_type = get_arg_type(env, spec_arg); - for (; unused_args; unused_args = unused_args->next) { - if (unused_args->name) continue; // Already handled the keyword args - type_t *call_type = get_arg_ast_type(env, unused_args); - if (!(type_eq(call_type, spec_type) || (promotion_allowed && can_promote(call_type, spec_type)) - || (promotion_allowed && unused_args->value->tag == Int && is_numeric_type(spec_type)) - || (promotion_allowed && unused_args->value->tag == Num && spec_type->tag == NumType))) - return NULL; // Positional arg trying to fill in - Table$str_set(&used_args, spec_arg->name, unused_args); - unused_args = unused_args->next; - goto found_it; - } - - if (spec_arg->default_val) - goto found_it; - - return NULL; - found_it: continue; - } - - while (unused_args && unused_args->name) - unused_args = unused_args->next; - - if (unused_args != NULL) - return NULL; - - Table_t *ret = new(Table_t); - *ret = used_args; - return ret; -} - -bool is_valid_call(env_t *env, arg_t *spec_args, arg_ast_t *call_args, bool promotion_allowed) -{ - Table_t *arg_bindings = get_arg_bindings(env, spec_args, call_args, promotion_allowed); - return (arg_bindings != NULL); -} - -PUREFUNC bool can_be_mutated(env_t *env, ast_t *ast) -{ - switch (ast->tag) { - case Var: return true; - case InlineCCode: return true; - case FieldAccess: { - auto access = Match(ast, FieldAccess); - type_t *fielded_type = get_type(env, access->fielded); - if (fielded_type->tag == PointerType) { - return true; - } else if (fielded_type->tag == StructType) { - return can_be_mutated(env, access->fielded); - } else { - return false; - } - } - case Index: { - auto index = Match(ast, Index); - type_t *indexed_type = get_type(env, index->indexed); - return (indexed_type->tag == PointerType); - } - default: return false; - } -} - -type_t *parse_type_string(env_t *env, const char *str) -{ - type_ast_t *ast = parse_type_str(str); - return ast ? parse_type_ast(env, ast) : NULL; -} - -PUREFUNC bool is_constant(env_t *env, ast_t *ast) -{ - switch (ast->tag) { - case Bool: case Num: case None: return true; - case Int: { - auto info = Match(ast, Int); - Int_t int_val = Int$parse(Text$from_str(info->str)); - if (int_val.small == 0) return false; // Failed to parse - return (Int$compare_value(int_val, I(BIGGEST_SMALL_INT)) <= 0); - } - case TextJoin: { - auto text = Match(ast, TextJoin); - if (!text->children) return true; // Empty string, OK - if (text->children->next) return false; // Concatenation, not constant - return is_constant(env, text->children->ast); - } - case TextLiteral: { - CORD literal = Match(ast, TextLiteral)->cord; - CORD_pos i; -#pragma GCC diagnostic push -#pragma GCC diagnostic ignored "-Wsign-conversion" - CORD_FOR(i, literal) { - if (!isascii(CORD_pos_fetch(i))) - return false; // Non-ASCII requires grapheme logic, not constant - } -#pragma GCC diagnostic pop - return true; // Literal ASCII string, OK - } - case Not: return is_constant(env, Match(ast, Not)->value); - case Negative: return is_constant(env, Match(ast, Negative)->value); - case BinaryOp: { - auto binop = Match(ast, BinaryOp); - switch (binop->op) { - case BINOP_UNKNOWN: case BINOP_POWER: case BINOP_CONCAT: case BINOP_MIN: case BINOP_MAX: case BINOP_CMP: - return false; - default: - return is_constant(env, binop->lhs) && is_constant(env, binop->rhs); - } - } - case Use: return true; - case FunctionCall: return false; - case InlineCCode: return true; - default: return false; - } -} - -// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1,\:0 |