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reify.c
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reify.c
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#include "reify.h"
#include "subtype.h"
#include "viewpoint.h"
#include "assemble.h"
#include "alias.h"
#include "../ast/token.h"
#include "ponyassert.h"
static void reify_typeparamref(pass_opt_t* opt, ast_t** astp, ast_t* typeparam, ast_t* typearg)
{
ast_t* ast = *astp;
pony_assert(ast_id(ast) == TK_TYPEPARAMREF);
pony_assert(ast_id(typeparam) == TK_TYPEPARAM);
ast_t* ref_def = (ast_t*)ast_data(ast);
ast_t* param_def = (ast_t*)ast_data(typeparam);
pony_assert(ref_def != NULL);
pony_assert(param_def != NULL);
AST_GET_CHILDREN(ref_def, ref_name, ref_constraint);
AST_GET_CHILDREN(param_def, param_name, param_constraint);
if(ref_def != param_def)
{
if(ast_name(ref_name) == ast_name(param_name))
{
if((ast_id(param_constraint) != TK_TYPEPARAMREF) &&
!is_subtype(ref_constraint, param_constraint, NULL, opt))
return;
} else {
return;
}
}
// Keep ephemerality.
switch(ast_id(ast_childidx(ast, 2)))
{
case TK_EPHEMERAL:
typearg = consume_type(typearg, TK_NONE);
break;
case TK_NONE:
break;
case TK_ALIASED:
typearg = alias(typearg);
break;
default:
pony_assert(0);
}
ast_replace(astp, typearg);
}
static void reify_arrow(ast_t** astp)
{
ast_t* ast = *astp;
pony_assert(ast_id(ast) == TK_ARROW);
AST_GET_CHILDREN(ast, left, right);
ast_t* r_left = left;
ast_t* r_right = right;
if(ast_id(left) == TK_ARROW)
{
AST_GET_CHILDREN(left, l_left, l_right);
r_left = l_left;
r_right = viewpoint_type(l_right, right);
}
ast_t* r_type = viewpoint_type(r_left, r_right);
ast_replace(astp, r_type);
}
static void reify_reference(ast_t** astp, ast_t* typeparam, ast_t* typearg)
{
ast_t* ast = *astp;
pony_assert(ast_id(ast) == TK_REFERENCE);
const char* name = ast_name(ast_child(ast));
sym_status_t status;
ast_t* ref_def = ast_get(ast, name, &status);
if(ref_def == NULL)
return;
ast_t* param_def = (ast_t*)ast_data(typeparam);
pony_assert(param_def != NULL);
if(ref_def != param_def)
return;
ast_setid(ast, TK_TYPEREF);
ast_add(ast, ast_from(ast, TK_NONE)); // 1st child: package reference
ast_append(ast, ast_from(ast, TK_NONE)); // 3rd child: type args
ast_settype(ast, typearg);
}
static void reify_one(pass_opt_t* opt, ast_t** astp, ast_t* typeparam, ast_t* typearg)
{
ast_t* ast = *astp;
ast_t* child = ast_child(ast);
while(child != NULL)
{
reify_one(opt, &child, typeparam, typearg);
child = ast_sibling(child);
}
ast_t* type = ast_type(ast);
if(type != NULL)
reify_one(opt, &type, typeparam, typearg);
switch(ast_id(ast))
{
case TK_TYPEPARAMREF:
reify_typeparamref(opt, astp, typeparam, typearg);
break;
case TK_ARROW:
reify_arrow(astp);
break;
case TK_REFERENCE:
reify_reference(astp, typeparam, typearg);
break;
default: {}
}
}
bool reify_defaults(ast_t* typeparams, ast_t* typeargs, bool errors,
pass_opt_t* opt)
{
pony_assert(
(ast_id(typeparams) == TK_TYPEPARAMS) ||
(ast_id(typeparams) == TK_NONE)
);
pony_assert(
(ast_id(typeargs) == TK_TYPEARGS) ||
(ast_id(typeargs) == TK_NONE)
);
size_t param_count = ast_childcount(typeparams);
size_t arg_count = ast_childcount(typeargs);
if(param_count == arg_count)
return true;
if(param_count < arg_count)
{
if(errors)
{
ast_error(opt->check.errors, typeargs, "too many type arguments");
ast_error_continue(opt->check.errors, typeparams, "definition is here");
}
return false;
}
// Pick up default type arguments if they exist.
ast_setid(typeargs, TK_TYPEARGS);
ast_t* typeparam = ast_childidx(typeparams, arg_count);
while(typeparam != NULL)
{
ast_t* defarg = ast_childidx(typeparam, 2);
if(ast_id(defarg) == TK_NONE)
break;
ast_append(typeargs, defarg);
typeparam = ast_sibling(typeparam);
}
if(typeparam != NULL)
{
if(errors)
{
ast_error(opt->check.errors, typeargs, "not enough type arguments");
ast_error_continue(opt->check.errors, typeparams, "definition is here");
}
return false;
}
return true;
}
ast_t* reify(ast_t* ast, ast_t* typeparams, ast_t* typeargs, pass_opt_t* opt,
bool duplicate)
{
(void)opt;
pony_assert(
(ast_id(typeparams) == TK_TYPEPARAMS) ||
(ast_id(typeparams) == TK_NONE)
);
pony_assert(
(ast_id(typeargs) == TK_TYPEARGS) ||
(ast_id(typeargs) == TK_NONE)
);
ast_t* r_ast;
if(duplicate)
r_ast = ast_dup(ast);
else
r_ast = ast;
// Iterate pairwise through the typeparams and typeargs.
ast_t* typeparam = ast_child(typeparams);
ast_t* typearg = ast_child(typeargs);
while((typeparam != NULL) && (typearg != NULL))
{
reify_one(opt, &r_ast, typeparam, typearg);
typeparam = ast_sibling(typeparam);
typearg = ast_sibling(typearg);
}
pony_assert(typeparam == NULL);
pony_assert(typearg == NULL);
return r_ast;
}
ast_t* reify_method_def(ast_t* ast, ast_t* typeparams, ast_t* typeargs,
pass_opt_t* opt)
{
(void)opt;
switch(ast_id(ast))
{
case TK_FUN:
case TK_BE:
case TK_NEW:
break;
default:
pony_assert(false);
}
// Remove the body AST to avoid duplicating it.
ast_t* body = ast_childidx(ast, 6);
ast_t* temp_body = ast_blank(TK_NONE);
ast_swap(body, temp_body);
ast_t* r_ast = reify(ast, typeparams, typeargs, opt, true);
ast_swap(temp_body, body);
ast_free_unattached(temp_body);
return r_ast;
}
bool check_constraints(ast_t* orig, ast_t* typeparams, ast_t* typeargs,
bool report_errors, pass_opt_t* opt)
{
ast_t* typeparam = ast_child(typeparams);
ast_t* typearg = ast_child(typeargs);
while(typeparam != NULL)
{
switch(ast_id(typearg))
{
case TK_NOMINAL:
{
ast_t* def = (ast_t*)ast_data(typearg);
if(ast_id(def) == TK_STRUCT)
{
if(report_errors)
{
ast_error(opt->check.errors, typearg,
"a struct cannot be used as a type argument");
}
return false;
}
break;
}
case TK_TYPEPARAMREF:
{
ast_t* def = (ast_t*)ast_data(typearg);
if(def == typeparam)
{
typeparam = ast_sibling(typeparam);
typearg = ast_sibling(typearg);
continue;
}
break;
}
default: {}
}
// Reify the constraint.
ast_t* constraint = ast_childidx(typeparam, 1);
ast_t* r_constraint = reify(constraint, typeparams, typeargs, opt,
true);
// A bound type must be a subtype of the constraint.
errorframe_t info = NULL;
errorframe_t* infop = (report_errors ? &info : NULL);
if(!is_subtype_constraint(typearg, r_constraint, infop, opt))
{
if(report_errors)
{
errorframe_t frame = NULL;
ast_error_frame(&frame, orig,
"type argument is outside its constraint");
ast_error_frame(&frame, typearg,
"argument: %s", ast_print_type(typearg));
ast_error_frame(&frame, typeparam,
"constraint: %s", ast_print_type(r_constraint));
errorframe_append(&frame, &info);
errorframe_report(&frame, opt->check.errors);
}
ast_free_unattached(r_constraint);
return false;
}
ast_free_unattached(r_constraint);
// A constructable constraint can only be fulfilled by a concrete typearg.
if(is_constructable(constraint) && !is_concrete(typearg))
{
if(report_errors)
{
ast_error(opt->check.errors, orig, "a constructable constraint can "
"only be fulfilled by a concrete type argument");
ast_error_continue(opt->check.errors, typearg, "argument: %s",
ast_print_type(typearg));
ast_error_continue(opt->check.errors, typeparam, "constraint: %s",
ast_print_type(constraint));
}
return false;
}
typeparam = ast_sibling(typeparam);
typearg = ast_sibling(typearg);
}
pony_assert(typeparam == NULL);
pony_assert(typearg == NULL);
return true;
}