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// This file defines how to do type promotions during compilation
#include "promotions.h"
#include "../ast.h"
#include "expressions.h"
#include "../environment.h"
#include "../stdlib/datatypes.h"
#include "../stdlib/text.h"
#include "../typecheck.h"
#include "../types.h"
#include "declarations.h"
#include "functions.h"
#include "integers.h"
#include "lists.h"
#include "optionals.h"
#include "pointers.h"
#include "sets.h"
#include "tables.h"
#include "types.h"
static Text_t quoted_str(const char *str) { return Text$quoted(Text$from_str(str), false, Text("\"")); }
public
bool promote(env_t *env, ast_t *ast, Text_t *code, type_t *actual, type_t *needed) {
if (type_eq(actual, needed)) return true;
if (!can_promote(actual, needed)) return false;
if (needed->tag == ClosureType && actual->tag == FunctionType) {
*code = Texts("((Closure_t){", *code, ", NULL})");
return true;
}
// Empty promotion:
type_t *more_complete = most_complete_type(actual, needed);
if (more_complete) return true;
// Optional promotion:
if (needed->tag == OptionalType && type_eq(actual, Match(needed, OptionalType)->type)) {
*code = promote_to_optional(actual, *code);
return true;
}
// Optional -> Bool promotion
if (actual->tag == OptionalType && needed->tag == BoolType) {
*code = Texts("(!", check_none(actual, *code), ")");
return true;
}
// Lang to Text_t:
if (actual->tag == TextType && needed->tag == TextType && streq(Match(needed, TextType)->lang, "Text")) return true;
// Automatic optional checking for nums:
if (needed->tag == NumType && actual->tag == OptionalType && Match(actual, OptionalType)->type->tag == NumType) {
int64_t line = get_line_number(ast->file, ast->start);
*code = Texts("({ ", compile_declaration(actual, Text("opt")), " = ", *code, "; ", "if unlikely (",
check_none(actual, Text("opt")), ")\n", "#line ", String(line), "\n", "fail_source(",
quoted_str(ast->file->filename), ", ", String((int64_t)(ast->start - ast->file->text)), ", ",
String((int64_t)(ast->end - ast->file->text)), ", ",
"\"This was expected to be a value, but it's none\");\n",
optional_into_nonnone(actual, Text("opt")), "; })");
return true;
}
// Numeric promotions/demotions
if ((is_numeric_type(actual) || actual->tag == BoolType) && (is_numeric_type(needed) || needed->tag == BoolType)) {
arg_ast_t *args = new (arg_ast_t, .value = LiteralCode(*code, .type = actual));
binding_t *constructor = get_constructor(
env, needed, args, env->current_type != NULL && type_eq(env->current_type, value_type(needed)));
if (constructor) {
DeclareMatch(fn, constructor->type, FunctionType);
if (fn->args->next == NULL) {
*code = Texts(constructor->code, "(", compile_arguments(env, ast, fn->args, args), ")");
return true;
}
}
}
if (needed->tag == EnumType) {
const char *tag = enum_single_value_tag(needed, actual);
binding_t *b = get_binding(Match(needed, EnumType)->env, tag);
assert(b && b->type->tag == FunctionType);
// Single-value enum constructor:
if (!promote(env, ast, code, actual, Match(b->type, FunctionType)->args->type)) return false;
*code = Texts(b->code, "(", *code, ")");
return true;
}
// Text_t to C String
if (actual->tag == TextType && type_eq(actual, TEXT_TYPE) && needed->tag == CStringType) {
*code = Texts("Text$as_c_string(", *code, ")");
return true;
}
// Automatic dereferencing:
if (actual->tag == PointerType && can_promote(Match(actual, PointerType)->pointed, needed)) {
*code = Texts("*(", *code, ")");
return promote(env, ast, code, Match(actual, PointerType)->pointed, needed);
}
// Stack ref promotion:
if (actual->tag == PointerType && needed->tag == PointerType) return true;
// Cross-promotion between tables with default values and without
if (needed->tag == TableType && actual->tag == TableType) return true;
if (needed->tag == ClosureType && actual->tag == ClosureType) return true;
if (needed->tag == FunctionType && actual->tag == FunctionType) {
*code = Texts("(", compile_type(needed), ")", *code);
return true;
}
// Set -> List promotion:
if (needed->tag == ListType && actual->tag == SetType
&& type_eq(Match(needed, ListType)->item_type, Match(actual, SetType)->item_type)) {
*code = Texts("(", *code, ").entries");
return true;
}
return false;
}
public
Text_t compile_to_type(env_t *env, ast_t *ast, type_t *t) {
assert(!is_incomplete_type(t));
if (ast->tag == Int && is_numeric_type(non_optional(t))) {
return compile_int_to_type(env, ast, t);
} else if (ast->tag == Num && t->tag == NumType) {
double n = Match(ast, Num)->n;
switch (Match(t, NumType)->bits) {
case TYPE_NBITS64: return Text$from_str(String(hex_double(n)));
case TYPE_NBITS32: return Text$from_str(String(hex_double(n), "f"));
default: code_err(ast, "This is not a valid number bit width");
}
} else if (ast->tag == None) {
if (t->tag != OptionalType) code_err(ast, "This is not supposed to be an optional type");
else if (Match(t, OptionalType)->type == NULL)
code_err(ast, "I don't know what kind of `none` this is supposed to "
"be!\nPlease "
"tell me by declaring a variable like `foo : Type = none`");
return compile_none(t);
} else if (t->tag == PointerType && (ast->tag == HeapAllocate || ast->tag == StackReference)) {
return compile_typed_allocation(env, ast, t);
} else if (t->tag == ListType && ast->tag == List) {
return compile_typed_list(env, ast, t);
} else if (t->tag == TableType && ast->tag == Table) {
return compile_typed_table(env, ast, t);
} else if (t->tag == SetType && ast->tag == Set) {
return compile_typed_set(env, ast, t);
}
type_t *actual = get_type(env, ast);
// Edge case: there are some situations where a method call needs to have
// the `self` value get compiled to a specific type that can't be fully
// inferred from the expression itself. We can infer what the specific type
// should be from what we know the specific type of the return value is,
// but it requires a bit of special logic.
// For example:
// x : [Int?] = [none].sorted()
// Here, we know that `[none]` is `[Int?]`, but we need to thread that
// information through the compiler using an `ExplicitlyTyped` node.
if (ast->tag == MethodCall) {
DeclareMatch(methodcall, ast, MethodCall);
type_t *self_type = get_type(env, methodcall->self);
// Currently, this is only implemented for cases where you have the
// return type and the self type equal to each other, because that's the
// main case I care about with list and set methods (e.g.
// `List.sorted()`)
if (is_incomplete_type(self_type) && type_eq(self_type, actual)) {
type_t *completed_self = most_complete_type(self_type, t);
if (completed_self) {
ast_t *explicit_self =
WrapAST(methodcall->self, ExplicitlyTyped, .ast = methodcall->self, .type = completed_self);
ast_t *new_methodcall =
WrapAST(ast, MethodCall, .self = explicit_self, .name = methodcall->name, .args = methodcall->args);
return compile_to_type(env, new_methodcall, t);
}
}
}
// Promote values to views-of-values if needed:
if (t->tag == PointerType && Match(t, PointerType)->is_stack && actual->tag != PointerType)
return Texts("stack(", compile_to_type(env, ast, Match(t, PointerType)->pointed), ")");
if (!is_incomplete_type(actual)) {
Text_t code = compile(env, ast);
if (promote(env, ast, &code, actual, t)) return code;
}
arg_ast_t *constructor_args = new (arg_ast_t, .value = ast);
binding_t *constructor = get_constructor(env, t, constructor_args, true);
if (constructor) {
arg_t *arg_spec = Match(constructor->type, FunctionType)->args;
return Texts(constructor->code, "(", compile_arguments(env, ast, arg_spec, constructor_args), ")");
}
code_err(ast, "I expected a ", type_to_str(t), " here, but this is a ", type_to_str(actual));
}
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