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upvalues.h
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upvalues.h
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#ifndef SV_UPVALUES_H
#define SV_UPVALUES_H
#include "silver/engine.h"
#include "descriptors.h"
static inline ant_value_t sv_setup_function_prototype(
ant_t *js, ant_value_t func_obj,
ant_value_t func_val
) {
ant_value_t proto_obj = mkobj(js, 0);
if (is_err(proto_obj)) return proto_obj;
ant_value_t object_proto = js_get_ctor_proto(js, "Object", 6);
if (vtype(object_proto) == T_OBJ) js_set_proto_init(proto_obj, object_proto);
ant_value_t ctor_key = js_mkstr(js, "constructor", 11);
if (is_err(ctor_key)) return ctor_key;
ant_value_t set_ctor = js_setprop(js, proto_obj, ctor_key, func_val);
if (is_err(set_ctor)) return set_ctor;
js_set_descriptor(js, proto_obj, "constructor", 11, JS_DESC_W | JS_DESC_C);
ant_value_t proto_key = js_mkstr(js, "prototype", 9);
if (is_err(proto_key)) return proto_key;
ant_value_t set_proto = js_setprop(js, func_obj, proto_key, proto_obj);
if (is_err(set_proto)) return set_proto;
js_set_descriptor(js, func_obj, "prototype", 9, JS_DESC_W);
return js_mkundef();
}
static inline ant_value_t sv_op_get_upval(
sv_vm_t *vm, sv_frame_t *frame,
ant_t *js, uint8_t *ip
) {
uint16_t idx = sv_get_u16(ip + 1);
sv_upvalue_t *uv = frame->upvalues[idx];
ant_value_t val = *uv->location;
if (val == SV_TDZ)
return js_mkerr_typed(js, JS_ERR_REFERENCE,
"Cannot access variable before initialization");
vm->stack[vm->sp++] = val;
return js_mkundef();
}
static inline void sv_op_put_upval(sv_vm_t *vm, sv_frame_t *frame, uint8_t *ip) {
uint16_t idx = sv_get_u16(ip + 1);
sv_upvalue_t *uv = frame->upvalues[idx];
*uv->location = vm->stack[--vm->sp];
}
static inline void sv_op_set_upval(sv_vm_t *vm, sv_frame_t *frame, uint8_t *ip) {
uint16_t idx = sv_get_u16(ip + 1);
sv_upvalue_t *uv = frame->upvalues[idx];
*uv->location = vm->stack[vm->sp - 1];
}
static inline void sv_op_close_upval(sv_vm_t *vm, sv_frame_t *frame, uint8_t *ip) {
uint16_t idx = sv_get_u16(ip + 1);
ant_value_t *slot = sv_frame_slot_ptr(frame, idx);
if (!slot) return;
sv_upvalue_t **pp = &vm->open_upvalues;
while (*pp) {
sv_upvalue_t *uv = *pp;
ant_value_t *loc = uv->location;
if (sv_slot_in_vm_stack(vm, loc) && loc >= slot) {
uv->closed = *loc;
uv->location = &uv->closed;
*pp = uv->next;
}
else pp = &uv->next;
}}
static inline sv_upvalue_t *sv_capture_upvalue(sv_vm_t *vm, ant_value_t *slot) {
sv_upvalue_t **pp = &vm->open_upvalues;
while (*pp && (*pp)->location > slot) pp = &(*pp)->next;
if (*pp && (*pp)->location == slot) return *pp;
sv_upvalue_t *uv = js_upvalue_alloc();
uv->location = slot; uv->next = *pp; *pp = uv;
return uv;
}
static inline void sv_op_closure(
sv_vm_t *vm, ant_t *js, sv_frame_t *frame,
sv_func_t *func, uint8_t *ip
) {
uint32_t idx = sv_get_u32(ip + 1);
sv_func_t *child = (sv_func_t *)(uintptr_t)vdata(func->constants[idx]);
sv_closure_t *closure = js_closure_alloc(js);
closure->func = child;
closure->bound_this = child->is_arrow ? frame->this : js_mkundef();
closure->bound_args = js_mkundef();
closure->super_val = js_mkundef();
closure->call_flags = child->is_arrow ? SV_CALL_IS_ARROW : 0;
if (child->upvalue_count > 0) {
closure->upvalues = calloc((size_t)child->upvalue_count, sizeof(sv_upvalue_t *));
for (int i = 0; i < child->upvalue_count; i++) {
sv_upval_desc_t *desc = &child->upval_descs[i];
if (desc->is_local) {
ant_value_t *slot = sv_frame_slot_ptr(frame, desc->index);
if (!slot) slot = frame->bp;
closure->upvalues[i] = sv_capture_upvalue(vm, slot);
} else closure->upvalues[i] = frame->upvalues[desc->index];
}
}
ant_value_t func_val = mkval(T_FUNC, (uintptr_t)closure);
vm->stack[vm->sp++] = func_val;
ant_value_t func_obj = mkobj(js, 0);
closure->func_obj = func_obj;
ant_value_t module_ctx = js_module_eval_active_ctx(js);
js_mark_constructor(func_obj, !child->is_arrow && !child->is_method);
js_setprop(js, func_obj, js->length_str, tov((double)child->param_count));
js_set_descriptor(js, func_obj, "length", 6, JS_DESC_C);
if (is_object_type(module_ctx))
js_set_slot_wb(js, func_obj, SLOT_MODULE_CTX, module_ctx);
if (!child->is_arrow && !child->is_method) sv_setup_function_prototype(js, func_obj, func_val);
if (child->is_strict) js_set_slot(func_obj, SLOT_STRICT, js_true);
if (child->is_async) {
js_set_slot(func_obj, SLOT_ASYNC, js_true);
ant_value_t async_proto = js_get_slot(js->global, SLOT_ASYNC_PROTO);
if (vtype(async_proto) == T_FUNC) js_set_proto_init(func_obj, async_proto);
} else {
ant_value_t func_proto = js_get_slot(js->global, SLOT_FUNC_PROTO);
if (vtype(func_proto) == T_FUNC) js_set_proto_init(func_obj, func_proto);
}
}
#endif

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