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// Logic for compiling tagged unions (enums)
#include <gc.h>
#include <stdio.h>
#include "ast.h"
#include "compile.h"
#include "environment.h"
#include "naming.h"
#include "stdlib/tables.h"
#include "stdlib/text.h"
#include "structs.h"
#include "typecheck.h"
Text_t compile_enum_typeinfo(env_t *env, ast_t *ast)
{
DeclareMatch(def, ast, EnumDef);
// Compile member types and constructors:
Text_t member_typeinfos = EMPTY_TEXT;
for (tag_ast_t *tag = def->tags; tag; tag = tag->next) {
if (!tag->fields) continue;
const char *tag_name = String(def->name, "$", tag->name);
type_t *tag_type = Table$str_get(*env->types, tag_name);
assert(tag_type && tag_type->tag == StructType);
member_typeinfos = Texts(
member_typeinfos, compile_struct_typeinfo(env, tag_type, tag_name, tag->fields, tag->secret, false));
}
int num_tags = 0;
for (tag_ast_t *t = def->tags; t; t = t->next)
num_tags += 1;
type_t *t = Table$str_get(*env->types, def->name);
const char *metamethods = is_packed_data(t) ? "PackedDataEnum$metamethods" : "Enum$metamethods";
Text_t info = namespace_name(env, env->namespace, Texts(def->name, "$$info"));
Text_t typeinfo = Texts("public const TypeInfo_t ", info, " = {",
String((int64_t)type_size(t)), "u, ", String((int64_t)type_align(t)), "u, .metamethods=", metamethods,
", {.tag=EnumInfo, .EnumInfo={.name=\"", def->name, "\", "
".num_tags=", String((int64_t)num_tags), ", .tags=(NamedType_t[]){");
for (tag_ast_t *tag = def->tags; tag; tag = tag->next) {
const char *tag_type_name = String(def->name, "$", tag->name);
type_t *tag_type = Table$str_get(*env->types, tag_type_name);
if (tag_type && Match(tag_type, StructType)->fields)
typeinfo = Texts(typeinfo, "{\"", tag->name, "\", ", compile_type_info(tag_type), "}, ");
else
typeinfo = Texts(typeinfo, "{\"", tag->name, "\"}, ");
}
typeinfo = Texts(typeinfo, "}}}};\n");
return Texts(member_typeinfos, typeinfo);
}
Text_t compile_enum_constructors(env_t *env, ast_t *ast)
{
DeclareMatch(def, ast, EnumDef);
Text_t constructors = EMPTY_TEXT;
for (tag_ast_t *tag = def->tags; tag; tag = tag->next) {
if (!tag->fields) continue;
Text_t arg_sig = EMPTY_TEXT;
for (arg_ast_t *field = tag->fields; field; field = field->next) {
type_t *field_t = get_arg_ast_type(env, field);
arg_sig = Texts(arg_sig, compile_declaration(field_t, Texts("$", field->name)));
if (field->next) arg_sig = Texts(arg_sig, ", ");
}
if (arg_sig.length == 0) arg_sig = Text("void");
Text_t type_name = namespace_name(env, env->namespace, Texts(def->name, "$$type"));
Text_t tagged_name = namespace_name(env, env->namespace, Texts(def->name, "$tagged$", tag->name));
Text_t tag_name = namespace_name(env, env->namespace, Texts(def->name, "$tag$", tag->name));
Text_t constructor_impl = Texts("public inline ", type_name, " ", tagged_name, "(", arg_sig, ") { return (",
type_name, "){.$tag=", tag_name, ", .", valid_c_name(tag->name), "={");
for (arg_ast_t *field = tag->fields; field; field = field->next) {
constructor_impl = Texts(constructor_impl, "$", field->name);
if (field->next) constructor_impl = Texts(constructor_impl, ", ");
}
constructor_impl = Texts(constructor_impl, "}}; }\n");
constructors = Texts(constructors, constructor_impl);
}
return constructors;
}
Text_t compile_enum_header(env_t *env, ast_t *ast)
{
DeclareMatch(def, ast, EnumDef);
Text_t all_defs = EMPTY_TEXT;
Text_t none_name = namespace_name(env, env->namespace, Texts(def->name, "$none"));
Text_t enum_name = namespace_name(env, env->namespace, Texts(def->name, "$$enum"));
Text_t enum_tags = Texts("{ ", none_name, "=0, ");
bool has_any_tags_with_fields = false;
for (tag_ast_t *tag = def->tags; tag; tag = tag->next) {
Text_t tag_name = namespace_name(env, env->namespace, Texts(def->name, "$tag$", tag->name));
enum_tags = Texts(enum_tags, tag_name);
if (tag->next) enum_tags = Texts(enum_tags, ", ");
has_any_tags_with_fields = has_any_tags_with_fields || (tag->fields != NULL);
}
enum_tags = Texts(enum_tags, " }");
if (!has_any_tags_with_fields) {
Text_t enum_def = Texts("enum ", enum_name, " ", enum_tags, ";\n");
Text_t info = namespace_name(env, env->namespace, Texts(def->name, "$$info"));
return Texts(enum_def, "extern const TypeInfo_t ", info, ";\n");
}
Text_t struct_name = namespace_name(env, env->namespace, Texts(def->name, "$$struct"));
Text_t enum_def = Texts("struct ", struct_name, " {\n"
"enum ", enum_tags, " $tag;\n"
"union {\n");
for (tag_ast_t *tag = def->tags; tag; tag = tag->next) {
if (!tag->fields) continue;
Text_t field_def = compile_struct_header(
env, WrapAST(ast, StructDef, .name=Text$as_c_string(Texts(def->name, "$", tag->name)), .fields=tag->fields));
all_defs = Texts(all_defs, field_def);
Text_t tag_type = namespace_name(env, env->namespace, Texts(def->name, "$", tag->name, "$$type"));
enum_def = Texts(enum_def, tag_type, " ", valid_c_name(tag->name), ";\n");
}
enum_def = Texts(enum_def, "};\n};\n");
all_defs = Texts(all_defs, enum_def);
Text_t info = namespace_name(env, env->namespace, Texts(def->name, "$$info"));
all_defs = Texts(all_defs, "extern const TypeInfo_t ", info, ";\n");
for (tag_ast_t *tag = def->tags; tag; tag = tag->next) {
if (!tag->fields) continue;
Text_t arg_sig = EMPTY_TEXT;
for (arg_ast_t *field = tag->fields; field; field = field->next) {
type_t *field_t = get_arg_ast_type(env, field);
arg_sig = Texts(arg_sig, compile_declaration(field_t, Texts("$", field->name)));
if (field->next) arg_sig = Texts(arg_sig, ", ");
}
if (arg_sig.length == 0) arg_sig = Text("void");
Text_t enum_type = namespace_name(env, env->namespace, Texts(def->name, "$$type"));
Text_t tagged_name = namespace_name(env, env->namespace, Texts(def->name, "$tagged$", tag->name));
Text_t constructor_def = Texts(enum_type, " ", tagged_name, "(", arg_sig, ");\n");
all_defs = Texts(all_defs, constructor_def);
}
return all_defs;
}
// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1,\:0
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