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class-simple.zl
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class-simple.zl
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/*
* Example class definition
* (slightly out of date)
*
class Y : public X {
struct D {
...
};
D d;
virtual Y make_y();
virtual D foo();
}
user_type Y {
make_subtype X; // this must come first otherwise X may be redefined by import
import X;
struct D {
};
class _VTable;
struct _Data {
_VTable * _vptr;
...
};
finalize user_type _Data;
class _VTable { / must come after _Data and finalize user_type;
Y (*make_y)();
D (*foo());
}
static _VTable _vtable;
...
now come access macros and functions in the order they appear
...
init() : static_constructor ...;
map _vptr ...;
void _constructor() ..;
}
*/
include_file "macro_api.zlh";
include_file "class-simple.zlh";
static void parse_class_var(Syntax * p, Match * m, Mark * mark,
SyntaxList * struct_b, SyntaxList * module_b);
static Syntax * parse_class_fun(Syntax * p, Match * m, Mark * mark,
SyntaxList * module_b,
UserType * parent_vtable,
SyntaxList * vtable_b, SyntaxList * vtable_i,
Context * context, Environ * env);
static Syntax * parse_class_fun_body(Syntax * p, Match * m, Mark * mark,
SyntaxList * module_b, Environ * env);
Syntax * parse_class_simple(Syntax * p, Environ * env) {
Mark * mark = new_mark();
Match * m = match_f(0, raw_syntax (name @ body :(public parent_n)), p);
Syntax * name = m->var(syntax name);
Syntax * body = m->var(syntax body);
Syntax * parent_s = m->var(syntax parent_n);
if (!body) {
//printf("DONE (declare only) %s\n", syntax_to_string(name));
return replace(syntax {declare_user_type name;}, m, mark);
}
UserType * parent = parent_s ? user_type_info(parent_s, env) : NULL;
Context * context = empty_context();
Environ * lenv = temp_environ(env);
pre_parse(replace(raw_syntax (declare_user_type (mid name)), m, mark),
lenv);
//printf("parse_class %s %s\n", syntax_to_string(name));
Module * parent_m = NULL;
UserType * parent_vtable = NULL;
Syntax * parent_vtable_n = NULL;
Syntax * vtable = NULL;
SyntaxList * struct_p = new_syntax_list();
SyntaxList * struct_b = new_syntax_list();
SyntaxList * module_p = new_syntax_list();
SyntaxList * module_b = new_syntax_list();
SyntaxList * vtable_b = new_syntax_list();
SyntaxList * vtable_i = new_syntax_list();
SyntaxList * exports = new_syntax_list();
m = match_f(m, syntax _Data, replace_context(syntax _Data, context));
m = match_f(m, syntax _parent, replace_context(syntax _parent, context));
m = match_f(m, syntax _VTable, replace_context(syntax _VTable, context));
m = match_f(m, syntax _vtable, replace_context(syntax _vtable, context));
m = match_f(m, syntax _vptr, replace_context(syntax _vptr, context));
m = match_f(m, syntax _set_vptr, replace_context(syntax _set_vptr, context));
m = match_f(m, syntax _constructor, replace_context(syntax _constructor, context));
m = match_f(m, syntax _vtable_init, replace_context(syntax _vtable_init, context));
if (parent) {
parent_m = parent->module;
parent_vtable_n = replace(syntax parent_n::_VTable, m, mark);
parent_vtable = user_type_info(parent_vtable_n, env);
// this needs to be one of the first things we do
module_p->append(replace(syntax {import parent_n;}, m, mark));
parse_class_var(partly_expand(replace(syntax {parent_n _parent;}, m, mark), FieldPos, lenv),
m, mark, struct_p, module_p);
module_p->append(replace(syntax {macro cast_up(p) {&(*p).._parent;}}, m, mark));
module_p->append(replace(syntax {macro cast_down(p) {reinterpret_cast<name *>(p);}}, m, mark));
module_p->append(replace(syntax {make_subtype parent_n cast_up cast_down;}, m, mark));
SyntaxEnum * itr = parent_m->symbols();
Syntax * syn;
while ((syn = itr->next())) {
exports->append(syn);
}
}
//
// Parse Body
//
SyntaxEnum * itr = partly_expand_list(match_parts_f(NULL, raw_syntax ({...} @body), body)->varl(syntax body),
FieldPos, lenv);
Syntax * member;
while ((member = itr->next)) {
Match * m0 = match_parts_f(m, raw_syntax (what n @ type @_), member);
const char * what = syntax_to_string(m0->var(syntax what));
// ignore access control labels for now
if (strcmp(what, "label")==0) continue;
Syntax * err = NULL;
if (strcmp(what, "var")==0) {
parse_class_var(member, m, mark, struct_b, module_b);
} else if (strcmp(what, "alias")==0) {
Match * m0 = match_parts_f(m, raw_syntax (what n type value @_), member);
module_b->append(replace(syntax {macro n (:this ths = this) {({__shadow typeof(ths) fluid this = ths; value;});}}, m0, mark));
} else if (strcmp(what, "fun")==0) {
err = parse_class_fun(member, m, mark, module_b, parent_vtable,
vtable_b, vtable_i, context, lenv);
} else {
// otherwise we have some sort of type definition which needs to go before
// _Data
module_p->append(pre_parse(member, lenv));
}
if (err) return err;
exports->append(m0->var(syntax n));
}
//
// Now generate vtable and related bits
//
const bool need_vtable = !vtable_i->empty();
if (need_vtable) {
SyntaxList * flags = new_syntax_list();
if (parent_vtable) // inherit parent vtable if one
flags->append_flag(replace(raw_syntax(public $1),
match_local(m, parent_vtable_n, NULL), mark));
if (m->var(syntax vtable_flag))
flags->append_flag(m->var(syntax vtable_flag));
if (parent_vtable) {
module_b->append(replace(
syntax {void _vtable_init(_VTable * _vt) {parent_n::_vtable_init(_vt); $1;}},
match_local(m, vtable_i, 0),
mark));
} else {
module_b->append(replace(
syntax {void _vtable_init(_VTable * _vt) {$1;}},
match_local(m, vtable_i, 0),
mark));
}
vtable_b->append(replace(
syntax {macro _constructor(:this ths = this) :typed_parms() {_vtable_init(ths);}},
m, mark));
// create new vtable class,
vtable = replace (raw_syntax(.class _VTable @$1 ({...} $2)),
match_local(m, flags, vtable_b, 0),
mark);
//printf("Adding _vptr\n");
if (parent_vtable) {
module_b->append(replace(
syntax {macro _vptr (:this this = this)
{(_VTable *)(implicit_cast<parent_n *>(this)->_vptr);}},
m, mark));
} else {
Syntax * v = replace(raw_syntax (var (mid _vptr) (.ptr (mid _VTable))), m, mark);
parse_class_var(v, m, mark, struct_p, module_b); // Note: beginning of structure but end of module
module_b->append(replace(
syntax {macro _set_vptr (:this this = this, other)
{(*implicit_cast<name *>(this)).._vptr = other;}},
m, mark));
}
exports->append(replace(syntax _vptr, m, mark));
module_b->append(replace(syntax {macro _constructor(:this ths = this) :typed_parms()
{({__shadow typeof(ths) fluid this = ths; _set_vptr(&_vtable);});}}, m, mark));
}
// Now add structure and _vtable to module
if (need_vtable) {
module_p->append(replace(raw_syntax (.class _VTable), m, mark));
exports->append(replace(syntax _VTable, m, mark));
exports->append(replace(syntax _VTable`outer, m, mark));
}
module_p->append(replace(
syntax {struct _Data {$1; $2;};},
match_local(m, struct_p, struct_b, 0),
mark));
module_p->append(replace(
syntax {finalize_user_type struct _Data;},
m,
mark));
if (need_vtable) {
module_p->append(vtable);
module_p->append(replace(syntax {_VTable _vtable;}, m, mark));
}
//module_b->append(replace(
// syntax {export $1;},
// match_local(m, exports, 0),
// mark));
//
// Finally create module and user type
//
Syntax * module_ = replace(syntax {user_type name {$1; $2;}},
match_local(m, module_p, module_b, 0),
mark);
//printf("DONE %s\n", syntax_to_string(name));
//dump_syntax(module_);
//printf("---\n");
return module_;
}
static void parse_class_var(Syntax * p, Match * m, Mark * mark,
SyntaxList * struct_b, SyntaxList * module_b)
{
//printf("parse_class_var: %s\n", syntax_to_string(p));
m = match_f(m, raw_syntax (n @rest), p);
bool is_static = p->flag(syntax static);
// FIXME: handle flags
if (is_static) {
module_b->append(replace(raw_syntax(var (` (mid n) internal) (mid @rest)), m, mark));
module_b->append(replace(syntax {macro n () {n`internal;}}, m, mark));
} else {
struct_b->append(p);
// FIXME: (name *)(this) may cast away const
module_b->append(replace(syntax {macro n (:this this = this) {(*(name *)(this))..n;}}, m, mark));
}
}
static Syntax * parse_class_fun(Syntax * p, Match * m, Mark * mark,
SyntaxList * module_b,
UserType * parent_vtable,
SyntaxList * vtable_b, SyntaxList * vtable_i,
Context * context, Environ * env)
{
//printf("parse_class_fun: %s\n", syntax_to_string(p));
m = match_f(m, raw_syntax (n parms ret @ body @rest), p);
m = match_f(m, raw_syntax (@parms), m->var(syntax parms));
//printf("STATIC? %d VIRTUAL? %d\n", is_static, is_virtual);
//assert(!(is_static && is_virtual)); // FIXME Error message
Match * m0;
Syntax * class_name = m->var(syntax name);
Syntax * name = m->var(syntax n);
// FIXME: handle flags
bool is_static = p->flag(syntax static);
bool is_virtual = p->flag(syntax virtual);
// create unique name vtable entry, needs to different so that we
// don't confuse vtable entries for special functions such as
// _destructor with the real function
char sbuf[1024];
snprintf(sbuf, 1024, "%s$fp", syntax_to_string(m->var(syntax n)));
m = match_f(m, syntax fpn,
replace_context(string_to_syntax(sbuf), get_context(m->var(syntax n))));
bool virtual_override = parent_vtable && parent_vtable->module->have_symbol(m->var(syntax fpn));
if (!is_virtual && virtual_override)
is_virtual = true;
SyntaxList * new_parms = new_syntax_list();
Syntax * this_parm = NULL;
if (!is_static) {
if (virtual_override) {
m = match_f(m, syntax this_t,
replace(raw_syntax(.tprop (.type (.tprop (-> (reinterpret_cast
(.ptr ((:: parent_n _VTable))) 0) fpn)
inner)) (parm 0)), m, mark));
this_parm = replace(raw_syntax(this_t ths), m, mark);
} else
this_parm = replace(raw_syntax ((.ptr name) (fluid this)), m, mark);
new_parms->append(this_parm);
}
SyntaxList * macro_parms = new_syntax_list();
SyntaxList * call_parms = new_syntax_list();
if (!is_static)
call_parms->append(replace(syntax ((name *)this), m, mark));
SyntaxEnum * parms_enum = m->varl(syntax parms);
unsigned i = 0;
Syntax * parm;
while ((parm = parms_enum->next())) {
new_parms->append(parm);
char sbuf[8];
snprintf(sbuf, 8, "arg%d", i);
Syntax * arg = replace(string_to_syntax(sbuf), 0, mark);
macro_parms->append(arg);
call_parms->append(arg);
++i;
}
if (!is_static)
macro_parms->append(replace(syntax (:this this = this), m, mark));
if (virtual_override)
module_b->append(replace(raw_syntax (fun (` n internal) (. $1) ret
(block (var (fluid this) (.ptr name) (cast (.ptr name) ths))
body)),
match_local(m, new_parms, 0), mark));
else
module_b->append(replace(raw_syntax (fun (` (mid n) internal) (.(mid $1)) (mid ret) (mid body)),
match_local(m, new_parms, 0), mark));
module_b->append(replace(syntax {macro n`non_virtual ($1) {n`internal($2);}},
match_local(m, macro_parms, call_parms, 0), mark));
if (is_virtual) {
//m = match(m, syntax fpn, m->var(syntax n));
module_b->append(replace(
syntax {macro n ($1) {(this->_vptr->fpn)($2);}},
match_local(m, macro_parms, call_parms, 0),
mark));
if (!virtual_override) {
m = match_f(m, syntax pfun,
replace(raw_syntax (.ptr (.fun (.(mid $1)) (mid ret))), match_local(m, new_parms, 0), mark));
vtable_b->append(replace(raw_syntax (var (mid fpn) (mid pfun)), m, mark));
}
vtable_i->append(replace(raw_syntax (assign (-> _vt fpn) (` n internal)), m, mark));
} else {
module_b->append(replace(syntax {macro n ($1) {n`internal($2);}},
match_local(m, macro_parms, call_parms, 0), mark));
}
return NULL;
}