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jsrun.c
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#include "jsi.h"
#include "jscompile.h"
#include "jsvalue.h"
#include "jsrun.h"
#include "utf.h"
static void jsR_run(js_State *J, js_Function *F);
/* Push values on stack */
#define STACK (J->stack)
#define TOP (J->top)
#define BOT (J->bot)
static void js_trystackoverflow(js_State *J)
{
STACK[TOP].type = JS_TLITSTR;
STACK[TOP].u.litstr = "exception stack overflow";
++TOP;
js_throw(J);
}
static void js_stackoverflow(js_State *J)
{
STACK[TOP].type = JS_TLITSTR;
STACK[TOP].u.litstr = "stack overflow";
++TOP;
js_throw(J);
}
static void js_outofmemory(js_State *J)
{
STACK[TOP].type = JS_TLITSTR;
STACK[TOP].u.litstr = "out of memory";
++TOP;
js_throw(J);
}
void *js_malloc(js_State *J, int size)
{
void *ptr = J->alloc(J->actx, NULL, size);
if (!ptr)
js_outofmemory(J);
return ptr;
}
void *js_realloc(js_State *J, void *ptr, int size)
{
ptr = J->alloc(J->actx, ptr, size);
if (!ptr)
js_outofmemory(J);
return ptr;
}
char *js_strdup(js_State *J, const char *s)
{
int n = strlen(s) + 1;
char *p = js_malloc(J, n);
memcpy(p, s, n);
return p;
}
void js_free(js_State *J, void *ptr)
{
J->alloc(J->actx, ptr, 0);
}
js_String *jsV_newmemstring(js_State *J, const char *s, int n)
{
js_String *v = js_malloc(J, soffsetof(js_String, p) + n + 1);
memcpy(v->p, s, n);
v->p[n] = 0;
v->gcmark = 0;
v->gcnext = J->gcstr;
J->gcstr = v;
++J->gccounter;
return v;
}
#define CHECKSTACK(n) if (TOP + n >= JS_STACKSIZE) js_stackoverflow(J)
void js_pushvalue(js_State *J, js_Value v)
{
CHECKSTACK(1);
STACK[TOP] = v;
++TOP;
}
void js_pushundefined(js_State *J)
{
CHECKSTACK(1);
STACK[TOP].type = JS_TUNDEFINED;
++TOP;
}
void js_pushnull(js_State *J)
{
CHECKSTACK(1);
STACK[TOP].type = JS_TNULL;
++TOP;
}
void js_pushboolean(js_State *J, int v)
{
CHECKSTACK(1);
STACK[TOP].type = JS_TBOOLEAN;
STACK[TOP].u.boolean = !!v;
++TOP;
}
void js_pushnumber(js_State *J, double v)
{
CHECKSTACK(1);
STACK[TOP].type = JS_TNUMBER;
STACK[TOP].u.number = v;
++TOP;
}
void js_pushstring(js_State *J, const char *v)
{
size_t n = strlen(v);
if (n > JS_STRLIMIT)
js_rangeerror(J, "invalid string length");
CHECKSTACK(1);
if (n <= soffsetof(js_Value, type)) {
char *s = STACK[TOP].u.shrstr;
while (n--) *s++ = *v++;
*s = 0;
STACK[TOP].type = JS_TSHRSTR;
} else {
STACK[TOP].type = JS_TMEMSTR;
STACK[TOP].u.memstr = jsV_newmemstring(J, v, n);
}
++TOP;
}
void js_pushlstring(js_State *J, const char *v, int n)
{
if (n > JS_STRLIMIT)
js_rangeerror(J, "invalid string length");
CHECKSTACK(1);
if (n <= soffsetof(js_Value, type)) {
char *s = STACK[TOP].u.shrstr;
while (n--) *s++ = *v++;
*s = 0;
STACK[TOP].type = JS_TSHRSTR;
} else {
STACK[TOP].type = JS_TMEMSTR;
STACK[TOP].u.memstr = jsV_newmemstring(J, v, n);
}
++TOP;
}
void js_pushliteral(js_State *J, const char *v)
{
CHECKSTACK(1);
STACK[TOP].type = JS_TLITSTR;
STACK[TOP].u.litstr = v;
++TOP;
}
void js_pushobject(js_State *J, js_Object *v)
{
CHECKSTACK(1);
STACK[TOP].type = JS_TOBJECT;
STACK[TOP].u.object = v;
++TOP;
}
void js_pushglobal(js_State *J)
{
js_pushobject(J, J->G);
}
void js_currentfunction(js_State *J)
{
CHECKSTACK(1);
if (BOT > 0)
STACK[TOP] = STACK[BOT-1];
else
STACK[TOP].type = JS_TUNDEFINED;
++TOP;
}
void *js_currentfunctiondata(js_State *J)
{
if (BOT > 0)
return STACK[BOT-1].u.object->u.c.data;
return NULL;
}
/* Read values from stack */
static js_Value *stackidx(js_State *J, int idx)
{
static js_Value undefined = { {0}, {0}, JS_TUNDEFINED };
idx = idx < 0 ? TOP + idx : BOT + idx;
if (idx < 0 || idx >= TOP)
return &undefined;
return STACK + idx;
}
js_Value *js_tovalue(js_State *J, int idx)
{
return stackidx(J, idx);
}
int js_isdefined(js_State *J, int idx) { return stackidx(J, idx)->type != JS_TUNDEFINED; }
int js_isundefined(js_State *J, int idx) { return stackidx(J, idx)->type == JS_TUNDEFINED; }
int js_isnull(js_State *J, int idx) { return stackidx(J, idx)->type == JS_TNULL; }
int js_isboolean(js_State *J, int idx) { return stackidx(J, idx)->type == JS_TBOOLEAN; }
int js_isnumber(js_State *J, int idx) { return stackidx(J, idx)->type == JS_TNUMBER; }
int js_isstring(js_State *J, int idx) { enum js_Type t = stackidx(J, idx)->type; return t == JS_TSHRSTR || t == JS_TLITSTR || t == JS_TMEMSTR; }
int js_isprimitive(js_State *J, int idx) { return stackidx(J, idx)->type != JS_TOBJECT; }
int js_isobject(js_State *J, int idx) { return stackidx(J, idx)->type == JS_TOBJECT; }
int js_iscoercible(js_State *J, int idx) { js_Value *v = stackidx(J, idx); return v->type != JS_TUNDEFINED && v->type != JS_TNULL; }
int js_iscallable(js_State *J, int idx)
{
js_Value *v = stackidx(J, idx);
if (v->type == JS_TOBJECT)
return v->u.object->type == JS_CFUNCTION ||
v->u.object->type == JS_CSCRIPT ||
v->u.object->type == JS_CCFUNCTION;
return 0;
}
int js_isarray(js_State *J, int idx)
{
js_Value *v = stackidx(J, idx);
return v->type == JS_TOBJECT && v->u.object->type == JS_CARRAY;
}
int js_isregexp(js_State *J, int idx)
{
js_Value *v = stackidx(J, idx);
return v->type == JS_TOBJECT && v->u.object->type == JS_CREGEXP;
}
int js_isuserdata(js_State *J, int idx, const char *tag)
{
js_Value *v = stackidx(J, idx);
if (v->type == JS_TOBJECT && v->u.object->type == JS_CUSERDATA)
return !strcmp(tag, v->u.object->u.user.tag);
return 0;
}
int js_iserror(js_State *J, int idx)
{
js_Value *v = stackidx(J, idx);
return v->type == JS_TOBJECT && v->u.object->type == JS_CERROR;
}
const char *js_typeof(js_State *J, int idx)
{
js_Value *v = stackidx(J, idx);
switch (v->type) {
default:
case JS_TSHRSTR: return "string";
case JS_TUNDEFINED: return "undefined";
case JS_TNULL: return "object";
case JS_TBOOLEAN: return "boolean";
case JS_TNUMBER: return "number";
case JS_TLITSTR: return "string";
case JS_TMEMSTR: return "string";
case JS_TOBJECT:
if (v->u.object->type == JS_CFUNCTION || v->u.object->type == JS_CCFUNCTION)
return "function";
return "object";
}
}
int js_type(js_State *J, int idx)
{
js_Value *v = stackidx(J, idx);
switch (v->type) {
default:
case JS_TSHRSTR: return JS_ISSTRING;
case JS_TUNDEFINED: return JS_ISUNDEFINED;
case JS_TNULL: return JS_ISNULL;
case JS_TBOOLEAN: return JS_ISBOOLEAN;
case JS_TNUMBER: return JS_ISNUMBER;
case JS_TLITSTR: return JS_ISSTRING;
case JS_TMEMSTR: return JS_ISSTRING;
case JS_TOBJECT:
if (v->u.object->type == JS_CFUNCTION || v->u.object->type == JS_CCFUNCTION)
return JS_ISFUNCTION;
return JS_ISOBJECT;
}
}
int js_toboolean(js_State *J, int idx)
{
return jsV_toboolean(J, stackidx(J, idx));
}
double js_tonumber(js_State *J, int idx)
{
return jsV_tonumber(J, stackidx(J, idx));
}
int js_tointeger(js_State *J, int idx)
{
return jsV_numbertointeger(jsV_tonumber(J, stackidx(J, idx)));
}
int js_toint32(js_State *J, int idx)
{
return jsV_numbertoint32(jsV_tonumber(J, stackidx(J, idx)));
}
unsigned int js_touint32(js_State *J, int idx)
{
return jsV_numbertouint32(jsV_tonumber(J, stackidx(J, idx)));
}
short js_toint16(js_State *J, int idx)
{
return jsV_numbertoint16(jsV_tonumber(J, stackidx(J, idx)));
}
unsigned short js_touint16(js_State *J, int idx)
{
return jsV_numbertouint16(jsV_tonumber(J, stackidx(J, idx)));
}
const char *js_tostring(js_State *J, int idx)
{
return jsV_tostring(J, stackidx(J, idx));
}
js_Object *js_toobject(js_State *J, int idx)
{
return jsV_toobject(J, stackidx(J, idx));
}
void js_toprimitive(js_State *J, int idx, int hint)
{
jsV_toprimitive(J, stackidx(J, idx), hint);
}
js_Regexp *js_toregexp(js_State *J, int idx)
{
js_Value *v = stackidx(J, idx);
if (v->type == JS_TOBJECT && v->u.object->type == JS_CREGEXP)
return &v->u.object->u.r;
js_typeerror(J, "not a regexp");
}
void *js_touserdata(js_State *J, int idx, const char *tag)
{
js_Value *v = stackidx(J, idx);
if (v->type == JS_TOBJECT && v->u.object->type == JS_CUSERDATA)
if (!strcmp(tag, v->u.object->u.user.tag))
return v->u.object->u.user.data;
js_typeerror(J, "not a %s", tag);
}
static js_Object *jsR_tofunction(js_State *J, int idx)
{
js_Value *v = stackidx(J, idx);
if (v->type == JS_TUNDEFINED || v->type == JS_TNULL)
return NULL;
if (v->type == JS_TOBJECT)
if (v->u.object->type == JS_CFUNCTION || v->u.object->type == JS_CCFUNCTION)
return v->u.object;
js_typeerror(J, "not a function");
}
/* Stack manipulation */
int js_gettop(js_State *J)
{
return TOP - BOT;
}
void js_pop(js_State *J, int n)
{
TOP -= n;
if (TOP < BOT) {
TOP = BOT;
js_error(J, "stack underflow!");
}
}
void js_remove(js_State *J, int idx)
{
idx = idx < 0 ? TOP + idx : BOT + idx;
if (idx < BOT || idx >= TOP)
js_error(J, "stack error!");
for (;idx < TOP - 1; ++idx)
STACK[idx] = STACK[idx+1];
--TOP;
}
void js_insert(js_State *J, int idx)
{
js_error(J, "not implemented yet");
}
void js_replace(js_State* J, int idx)
{
idx = idx < 0 ? TOP + idx : BOT + idx;
if (idx < BOT || idx >= TOP)
js_error(J, "stack error!");
STACK[idx] = STACK[--TOP];
}
void js_copy(js_State *J, int idx)
{
CHECKSTACK(1);
STACK[TOP] = *stackidx(J, idx);
++TOP;
}
void js_dup(js_State *J)
{
CHECKSTACK(1);
STACK[TOP] = STACK[TOP-1];
++TOP;
}
void js_dup2(js_State *J)
{
CHECKSTACK(2);
STACK[TOP] = STACK[TOP-2];
STACK[TOP+1] = STACK[TOP-1];
TOP += 2;
}
void js_rot2(js_State *J)
{
/* A B -> B A */
js_Value tmp = STACK[TOP-1]; /* A B (B) */
STACK[TOP-1] = STACK[TOP-2]; /* A A */
STACK[TOP-2] = tmp; /* B A */
}
void js_rot3(js_State *J)
{
/* A B C -> C A B */
js_Value tmp = STACK[TOP-1]; /* A B C (C) */
STACK[TOP-1] = STACK[TOP-2]; /* A B B */
STACK[TOP-2] = STACK[TOP-3]; /* A A B */
STACK[TOP-3] = tmp; /* C A B */
}
void js_rot4(js_State *J)
{
/* A B C D -> D A B C */
js_Value tmp = STACK[TOP-1]; /* A B C D (D) */
STACK[TOP-1] = STACK[TOP-2]; /* A B C C */
STACK[TOP-2] = STACK[TOP-3]; /* A B B C */
STACK[TOP-3] = STACK[TOP-4]; /* A A B C */
STACK[TOP-4] = tmp; /* D A B C */
}
void js_rot2pop1(js_State *J)
{
/* A B -> B */
STACK[TOP-2] = STACK[TOP-1];
--TOP;
}
void js_rot3pop2(js_State *J)
{
/* A B C -> C */
STACK[TOP-3] = STACK[TOP-1];
TOP -= 2;
}
void js_rot(js_State *J, int n)
{
int i;
js_Value tmp = STACK[TOP-1];
for (i = 1; i < n; ++i)
STACK[TOP-i] = STACK[TOP-i-1];
STACK[TOP-i] = tmp;
}
/* Property access that takes care of attributes and getters/setters */
int js_isarrayindex(js_State *J, const char *p, int *idx)
{
int n = 0;
/* check for empty string */
if (p[0] == 0)
return 0;
/* check for '0' and integers with leading zero */
if (p[0] == '0')
return (p[1] == 0) ? *idx = 0, 1 : 0;
while (*p) {
int c = *p++;
if (c >= '0' && c <= '9') {
if (n >= INT_MAX / 10)
return 0;
n = n * 10 + (c - '0');
} else {
return 0;
}
}
return *idx = n, 1;
}
static void js_pushrune(js_State *J, Rune rune)
{
char buf[UTFmax + 1];
if (rune >= 0) {
buf[runetochar(buf, &rune)] = 0;
js_pushstring(J, buf);
} else {
js_pushundefined(J);
}
}
static int jsR_hasproperty(js_State *J, js_Object *obj, const char *name)
{
js_Property *ref;
int k;
if (obj->type == JS_CARRAY) {
if (!strcmp(name, "length")) {
js_pushnumber(J, obj->u.a.length);
return 1;
}
}
else if (obj->type == JS_CSTRING) {
if (!strcmp(name, "length")) {
js_pushnumber(J, obj->u.s.length);
return 1;
}
if (js_isarrayindex(J, name, &k)) {
if (k >= 0 && k < obj->u.s.length) {
js_pushrune(J, js_runeat(J, obj->u.s.string, k));
return 1;
}
}
}
else if (obj->type == JS_CREGEXP) {
if (!strcmp(name, "source")) {
js_pushstring(J, obj->u.r.source);
return 1;
}
if (!strcmp(name, "global")) {
js_pushboolean(J, obj->u.r.flags & JS_REGEXP_G);
return 1;
}
if (!strcmp(name, "ignoreCase")) {
js_pushboolean(J, obj->u.r.flags & JS_REGEXP_I);
return 1;
}
if (!strcmp(name, "multiline")) {
js_pushboolean(J, obj->u.r.flags & JS_REGEXP_M);
return 1;
}
if (!strcmp(name, "lastIndex")) {
js_pushnumber(J, obj->u.r.last);
return 1;
}
}
else if (obj->type == JS_CUSERDATA) {
if (obj->u.user.has && obj->u.user.has(J, obj->u.user.data, name))
return 1;
}
ref = jsV_getproperty(J, obj, name);
if (ref) {
if (ref->getter) {
js_pushobject(J, ref->getter);
js_pushobject(J, obj);
js_call(J, 0);
} else {
js_pushvalue(J, ref->value);
}
return 1;
}
return 0;
}
static void jsR_getproperty(js_State *J, js_Object *obj, const char *name)
{
if (!jsR_hasproperty(J, obj, name))
js_pushundefined(J);
}
static void jsR_setproperty(js_State *J, js_Object *obj, const char *name, int transient)
{
js_Value *value = stackidx(J, -1);
js_Property *ref;
int k;
int own;
if (obj->type == JS_CARRAY) {
if (!strcmp(name, "length")) {
double rawlen = jsV_tonumber(J, value);
int newlen = jsV_numbertointeger(rawlen);
if (newlen != rawlen || newlen < 0)
js_rangeerror(J, "invalid array length");
jsV_resizearray(J, obj, newlen);
return;
}
if (js_isarrayindex(J, name, &k))
if (k >= obj->u.a.length)
obj->u.a.length = k + 1;
}
else if (obj->type == JS_CSTRING) {
if (!strcmp(name, "length"))
goto readonly;
if (js_isarrayindex(J, name, &k))
if (k >= 0 && k < obj->u.s.length)
goto readonly;
}
else if (obj->type == JS_CREGEXP) {
if (!strcmp(name, "source")) goto readonly;
if (!strcmp(name, "global")) goto readonly;
if (!strcmp(name, "ignoreCase")) goto readonly;
if (!strcmp(name, "multiline")) goto readonly;
if (!strcmp(name, "lastIndex")) {
obj->u.r.last = jsV_tointeger(J, value);
return;
}
}
else if (obj->type == JS_CUSERDATA) {
if (obj->u.user.put && obj->u.user.put(J, obj->u.user.data, name))
return;
}
/* First try to find a setter in prototype chain */
ref = jsV_getpropertyx(J, obj, name, &own);
if (ref) {
if (ref->setter) {
js_pushobject(J, ref->setter);
js_pushobject(J, obj);
js_pushvalue(J, *value);
js_call(J, 1);
js_pop(J, 1);
return;
} else {
if (J->strict)
if (ref->getter)
js_typeerror(J, "setting property '%s' that only has a getter", name);
if (ref->atts & JS_READONLY)
goto readonly;
}
}
/* Property not found on this object, so create one */
if (!ref || !own) {
if (transient) {
if (J->strict)
js_typeerror(J, "cannot create property '%s' on transient object", name);
return;
}
ref = jsV_setproperty(J, obj, name);
}
if (ref) {
if (!(ref->atts & JS_READONLY))
ref->value = *value;
else
goto readonly;
}
return;
readonly:
if (J->strict)
js_typeerror(J, "'%s' is read-only", name);
}
static void jsR_defproperty(js_State *J, js_Object *obj, const char *name,
int atts, js_Value *value, js_Object *getter, js_Object *setter,
int throw)
{
js_Property *ref;
int k;
if (obj->type == JS_CARRAY) {
if (!strcmp(name, "length"))
goto readonly;
}
else if (obj->type == JS_CSTRING) {
if (!strcmp(name, "length"))
goto readonly;
if (js_isarrayindex(J, name, &k))
if (k >= 0 && k < obj->u.s.length)
goto readonly;
}
else if (obj->type == JS_CREGEXP) {
if (!strcmp(name, "source")) goto readonly;
if (!strcmp(name, "global")) goto readonly;
if (!strcmp(name, "ignoreCase")) goto readonly;
if (!strcmp(name, "multiline")) goto readonly;
if (!strcmp(name, "lastIndex")) goto readonly;
}
else if (obj->type == JS_CUSERDATA) {
if (obj->u.user.put && obj->u.user.put(J, obj->u.user.data, name))
return;
}
ref = jsV_setproperty(J, obj, name);
if (ref) {
if (value) {
if (!(ref->atts & JS_READONLY))
ref->value = *value;
else if (J->strict)
js_typeerror(J, "'%s' is read-only", name);
}
if (getter) {
if (!(ref->atts & JS_DONTCONF))
ref->getter = getter;
else if (J->strict)
js_typeerror(J, "'%s' is non-configurable", name);
}
if (setter) {
if (!(ref->atts & JS_DONTCONF))
ref->setter = setter;
else if (J->strict)
js_typeerror(J, "'%s' is non-configurable", name);
}
ref->atts |= atts;
}
return;
readonly:
if (J->strict || throw)
js_typeerror(J, "'%s' is read-only or non-configurable", name);
}
static int jsR_delproperty(js_State *J, js_Object *obj, const char *name)
{
js_Property *ref;
int k;
if (obj->type == JS_CARRAY) {
if (!strcmp(name, "length"))
goto dontconf;
}
else if (obj->type == JS_CSTRING) {
if (!strcmp(name, "length"))
goto dontconf;
if (js_isarrayindex(J, name, &k))
if (k >= 0 && k < obj->u.s.length)
goto dontconf;
}
else if (obj->type == JS_CREGEXP) {
if (!strcmp(name, "source")) goto dontconf;
if (!strcmp(name, "global")) goto dontconf;
if (!strcmp(name, "ignoreCase")) goto dontconf;
if (!strcmp(name, "multiline")) goto dontconf;
if (!strcmp(name, "lastIndex")) goto dontconf;
}
else if (obj->type == JS_CUSERDATA) {
if (obj->u.user.delete && obj->u.user.delete(J, obj->u.user.data, name))
return 1;
}
ref = jsV_getownproperty(J, obj, name);
if (ref) {
if (ref->atts & JS_DONTCONF)
goto dontconf;
jsV_delproperty(J, obj, name);
}
return 1;
dontconf:
if (J->strict)
js_typeerror(J, "'%s' is non-configurable", name);
return 0;
}
/* Registry, global and object property accessors */
const char *js_ref(js_State *J)
{
js_Value *v = stackidx(J, -1);
const char *s;
char buf[32];
switch (v->type) {
case JS_TUNDEFINED: s = "_Undefined"; break;
case JS_TNULL: s = "_Null"; break;
case JS_TBOOLEAN:
s = v->u.boolean ? "_True" : "_False";
break;
case JS_TOBJECT:
sprintf(buf, "%p", (void*)v->u.object);
s = js_intern(J, buf);
break;
default:
sprintf(buf, "%d", J->nextref++);
s = js_intern(J, buf);
break;
}
js_setregistry(J, s);
return s;
}
void js_unref(js_State *J, const char *ref)
{
js_delregistry(J, ref);
}
void js_getregistry(js_State *J, const char *name)
{
jsR_getproperty(J, J->R, name);
}
void js_setregistry(js_State *J, const char *name)
{
jsR_setproperty(J, J->R, name, 0);
js_pop(J, 1);
}
void js_delregistry(js_State *J, const char *name)
{
jsR_delproperty(J, J->R, name);
}
void js_getglobal(js_State *J, const char *name)
{
jsR_getproperty(J, J->G, name);
}
void js_setglobal(js_State *J, const char *name)
{
jsR_setproperty(J, J->G, name, 0);
js_pop(J, 1);
}
void js_defglobal(js_State *J, const char *name, int atts)
{
jsR_defproperty(J, J->G, name, atts, stackidx(J, -1), NULL, NULL, 0);
js_pop(J, 1);
}
void js_delglobal(js_State *J, const char *name)
{
jsR_delproperty(J, J->G, name);
}
void js_getproperty(js_State *J, int idx, const char *name)
{
jsR_getproperty(J, js_toobject(J, idx), name);
}
void js_setproperty(js_State *J, int idx, const char *name)
{
jsR_setproperty(J, js_toobject(J, idx), name, !js_isobject(J, idx));
js_pop(J, 1);
}
void js_defproperty(js_State *J, int idx, const char *name, int atts)
{
jsR_defproperty(J, js_toobject(J, idx), name, atts, stackidx(J, -1), NULL, NULL, 1);
js_pop(J, 1);
}
void js_delproperty(js_State *J, int idx, const char *name)
{
jsR_delproperty(J, js_toobject(J, idx), name);
}
void js_defaccessor(js_State *J, int idx, const char *name, int atts)
{
jsR_defproperty(J, js_toobject(J, idx), name, atts, NULL, jsR_tofunction(J, -2), jsR_tofunction(J, -1), 1);
js_pop(J, 2);
}
int js_hasproperty(js_State *J, int idx, const char *name)
{
return jsR_hasproperty(J, js_toobject(J, idx), name);
}
/* Iterator */
void js_pushiterator(js_State *J, int idx, int own)
{
js_pushobject(J, jsV_newiterator(J, js_toobject(J, idx), own));
}
const char *js_nextiterator(js_State *J, int idx)
{
return jsV_nextiterator(J, js_toobject(J, idx));
}
/* Environment records */
js_Environment *jsR_newenvironment(js_State *J, js_Object *vars, js_Environment *outer)
{
js_Environment *E = js_malloc(J, sizeof *E);
E->gcmark = 0;
E->gcnext = J->gcenv;
J->gcenv = E;
++J->gccounter;
E->outer = outer;
E->variables = vars;
return E;
}
static void js_initvar(js_State *J, const char *name, int idx)
{
jsR_defproperty(J, J->E->variables, name, JS_DONTENUM | JS_DONTCONF, stackidx(J, idx), NULL, NULL, 0);
}
static int js_hasvar(js_State *J, const char *name)
{
js_Environment *E = J->E;
do {
js_Property *ref = jsV_getproperty(J, E->variables, name);
if (ref) {
if (ref->getter) {
js_pushobject(J, ref->getter);
js_pushobject(J, E->variables);
js_call(J, 0);
} else {
js_pushvalue(J, ref->value);
}
return 1;
}
E = E->outer;
} while (E);
return 0;
}
static void js_setvar(js_State *J, const char *name)
{
js_Environment *E = J->E;
do {
js_Property *ref = jsV_getproperty(J, E->variables, name);
if (ref) {
if (ref->setter) {
js_pushobject(J, ref->setter);
js_pushobject(J, E->variables);
js_copy(J, -3);
js_call(J, 1);
js_pop(J, 1);
return;
}
if (!(ref->atts & JS_READONLY))
ref->value = *stackidx(J, -1);
else if (J->strict)
js_typeerror(J, "'%s' is read-only", name);
return;
}
E = E->outer;
} while (E);
if (J->strict)
js_referenceerror(J, "assignment to undeclared variable '%s'", name);
jsR_setproperty(J, J->G, name, 0);
}
static int js_delvar(js_State *J, const char *name)
{
js_Environment *E = J->E;
do {
js_Property *ref = jsV_getownproperty(J, E->variables, name);
if (ref) {
if (ref->atts & JS_DONTCONF) {
if (J->strict)
js_typeerror(J, "'%s' is non-configurable", name);
return 0;
}
jsV_delproperty(J, E->variables, name);
return 1;
}
E = E->outer;
} while (E);
return jsR_delproperty(J, J->G, name);
}
/* Function calls */
static void jsR_savescope(js_State *J, js_Environment *newE)
{
if (J->envtop + 1 >= JS_ENVLIMIT)
js_stackoverflow(J);
J->envstack[J->envtop++] = J->E;
J->E = newE;
}
static void jsR_restorescope(js_State *J)