--- /dev/null
+/*
+ * Duktape built-ins
+ *
+ * Size optimization note: it might seem that vararg multipurpose functions
+ * like fin(), enc(), and dec() are not very size optimal, but using a single
+ * user-visible Ecmascript function saves a lot of run-time footprint; each
+ * Function instance takes >100 bytes. Using a shared native helper and a
+ * 'magic' value won't save much if there are multiple Function instances
+ * anyway.
+ */
+
+#include "duk_internal.h"
+
+/* Raw helper to extract internal information / statistics about a value.
+ * The return values are version specific and must not expose anything
+ * that would lead to security issues (e.g. exposing compiled function
+ * 'data' buffer might be an issue). Currently only counts and sizes and
+ * such are given so there should not be a security impact.
+ */
+DUK_INTERNAL duk_ret_t duk_bi_duktape_object_info(duk_context *ctx) {
+ duk_hthread *thr = (duk_hthread *) ctx;
+ duk_tval *tv;
+ duk_heaphdr *h;
+ duk_int_t i, n;
+
+ DUK_UNREF(thr);
+
+ /* result array */
+ duk_push_array(ctx); /* -> [ val arr ] */
+
+ /* type tag (public) */
+ duk_push_int(ctx, duk_get_type(ctx, 0));
+
+ /* address */
+ tv = duk_get_tval(ctx, 0);
+ DUK_ASSERT(tv != NULL); /* because arg count is 1 */
+ if (DUK_TVAL_IS_HEAP_ALLOCATED(tv)) {
+ h = DUK_TVAL_GET_HEAPHDR(tv);
+ duk_push_pointer(ctx, (void *) h);
+ } else {
+ /* internal type tag */
+ duk_push_int(ctx, (duk_int_t) DUK_TVAL_GET_TAG(tv));
+ goto done;
+ }
+ DUK_ASSERT(h != NULL);
+
+ /* refcount */
+#ifdef DUK_USE_REFERENCE_COUNTING
+ duk_push_size_t(ctx, DUK_HEAPHDR_GET_REFCOUNT(h));
+#else
+ duk_push_undefined(ctx);
+#endif
+
+ /* heaphdr size and additional allocation size, followed by
+ * type specific stuff (with varying value count)
+ */
+ switch ((duk_small_int_t) DUK_HEAPHDR_GET_TYPE(h)) {
+ case DUK_HTYPE_STRING: {
+ duk_hstring *h_str = (duk_hstring *) h;
+ duk_push_uint(ctx, (duk_uint_t) (sizeof(duk_hstring) + DUK_HSTRING_GET_BYTELEN(h_str) + 1));
+ break;
+ }
+ case DUK_HTYPE_OBJECT: {
+ duk_hobject *h_obj = (duk_hobject *) h;
+ duk_small_uint_t hdr_size;
+ if (DUK_HOBJECT_IS_COMPILEDFUNCTION(h_obj)) {
+ hdr_size = (duk_small_uint_t) sizeof(duk_hcompiledfunction);
+ } else if (DUK_HOBJECT_IS_NATIVEFUNCTION(h_obj)) {
+ hdr_size = (duk_small_uint_t) sizeof(duk_hnativefunction);
+ } else if (DUK_HOBJECT_IS_THREAD(h_obj)) {
+ hdr_size = (duk_small_uint_t) sizeof(duk_hthread);
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+ } else if (DUK_HOBJECT_IS_BUFFEROBJECT(h_obj)) {
+ hdr_size = (duk_small_uint_t) sizeof(duk_hbufferobject);
+#endif
+ } else {
+ hdr_size = (duk_small_uint_t) sizeof(duk_hobject);
+ }
+ duk_push_uint(ctx, (duk_uint_t) hdr_size);
+ duk_push_uint(ctx, (duk_uint_t) DUK_HOBJECT_P_ALLOC_SIZE(h_obj));
+ duk_push_uint(ctx, (duk_uint_t) DUK_HOBJECT_GET_ESIZE(h_obj));
+ /* Note: e_next indicates the number of gc-reachable entries
+ * in the entry part, and also indicates the index where the
+ * next new property would be inserted. It does *not* indicate
+ * the number of non-NULL keys present in the object. That
+ * value could be counted separately but requires a pass through
+ * the key list.
+ */
+ duk_push_uint(ctx, (duk_uint_t) DUK_HOBJECT_GET_ENEXT(h_obj));
+ duk_push_uint(ctx, (duk_uint_t) DUK_HOBJECT_GET_ASIZE(h_obj));
+ duk_push_uint(ctx, (duk_uint_t) DUK_HOBJECT_GET_HSIZE(h_obj));
+ if (DUK_HOBJECT_IS_COMPILEDFUNCTION(h_obj)) {
+ duk_hbuffer *h_data = (duk_hbuffer *) DUK_HCOMPILEDFUNCTION_GET_DATA(thr->heap, (duk_hcompiledfunction *) h_obj);
+ if (h_data) {
+ duk_push_uint(ctx, (duk_uint_t) DUK_HBUFFER_GET_SIZE(h_data));
+ } else {
+ duk_push_uint(ctx, 0);
+ }
+ }
+ break;
+ }
+ case DUK_HTYPE_BUFFER: {
+ duk_hbuffer *h_buf = (duk_hbuffer *) h;
+ if (DUK_HBUFFER_HAS_DYNAMIC(h_buf)) {
+ if (DUK_HBUFFER_HAS_EXTERNAL(h_buf)) {
+ duk_push_uint(ctx, (duk_uint_t) (sizeof(duk_hbuffer_external)));
+ } else {
+ /* When alloc_size == 0 the second allocation may not
+ * actually exist.
+ */
+ duk_push_uint(ctx, (duk_uint_t) (sizeof(duk_hbuffer_dynamic)));
+ }
+ duk_push_uint(ctx, (duk_uint_t) (DUK_HBUFFER_GET_SIZE(h_buf)));
+ } else {
+ duk_push_uint(ctx, (duk_uint_t) (sizeof(duk_hbuffer_fixed) + DUK_HBUFFER_GET_SIZE(h_buf) + 1));
+ }
+ break;
+
+ }
+ }
+
+ done:
+ /* set values into ret array */
+ /* XXX: primitive to make array from valstack slice */
+ n = duk_get_top(ctx);
+ for (i = 2; i < n; i++) {
+ duk_dup(ctx, i);
+ duk_put_prop_index(ctx, 1, i - 2);
+ }
+ duk_dup(ctx, 1);
+ return 1;
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_duktape_object_act(duk_context *ctx) {
+ duk_hthread *thr = (duk_hthread *) ctx;
+ duk_activation *act;
+ duk_uint_fast32_t pc;
+ duk_uint_fast32_t line;
+ duk_int_t level;
+
+ /* -1 = top callstack entry, callstack[callstack_top - 1]
+ * -callstack_top = bottom callstack entry, callstack[0]
+ */
+ level = duk_to_int(ctx, 0);
+ if (level >= 0 || -level > (duk_int_t) thr->callstack_top) {
+ return 0;
+ }
+ DUK_ASSERT(level >= -((duk_int_t) thr->callstack_top) && level <= -1);
+ act = thr->callstack + thr->callstack_top + level;
+
+ duk_push_object(ctx);
+
+ duk_push_tval(ctx, &act->tv_func);
+
+ /* Relevant PC is just before current one because PC is
+ * post-incremented. This should match what error augment
+ * code does.
+ */
+ pc = duk_hthread_get_act_prev_pc(thr, act);
+ duk_push_uint(ctx, (duk_uint_t) pc);
+
+#if defined(DUK_USE_PC2LINE)
+ line = duk_hobject_pc2line_query(ctx, -2, pc);
+#else
+ line = 0;
+#endif
+ duk_push_uint(ctx, (duk_uint_t) line);
+
+ /* Providing access to e.g. act->lex_env would be dangerous: these
+ * internal structures must never be accessible to the application.
+ * Duktape relies on them having consistent data, and this consistency
+ * is only asserted for, not checked for.
+ */
+
+ /* [ level obj func pc line ] */
+
+ /* XXX: version specific array format instead? */
+ duk_xdef_prop_stridx_wec(ctx, -4, DUK_STRIDX_LINE_NUMBER);
+ duk_xdef_prop_stridx_wec(ctx, -3, DUK_STRIDX_PC);
+ duk_xdef_prop_stridx_wec(ctx, -2, DUK_STRIDX_LC_FUNCTION);
+ return 1;
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_duktape_object_gc(duk_context *ctx) {
+#ifdef DUK_USE_MARK_AND_SWEEP
+ duk_hthread *thr = (duk_hthread *) ctx;
+ duk_small_uint_t flags;
+ duk_bool_t rc;
+
+ flags = (duk_small_uint_t) duk_get_uint(ctx, 0);
+ rc = duk_heap_mark_and_sweep(thr->heap, flags);
+
+ /* XXX: Not sure what the best return value would be in the API.
+ * Return a boolean for now. Note that rc == 0 is success (true).
+ */
+ duk_push_boolean(ctx, !rc);
+ return 1;
+#else
+ DUK_UNREF(ctx);
+ return 0;
+#endif
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_duktape_object_fin(duk_context *ctx) {
+ (void) duk_require_hobject(ctx, 0);
+ if (duk_get_top(ctx) >= 2) {
+ /* Set: currently a finalizer is disabled by setting it to
+ * undefined; this does not remove the property at the moment.
+ * The value could be type checked to be either a function
+ * or something else; if something else, the property could
+ * be deleted.
+ */
+ duk_set_top(ctx, 2);
+ (void) duk_put_prop_stridx(ctx, 0, DUK_STRIDX_INT_FINALIZER);
+ return 0;
+ } else {
+ /* Get. */
+ DUK_ASSERT(duk_get_top(ctx) == 1);
+ duk_get_prop_stridx(ctx, 0, DUK_STRIDX_INT_FINALIZER);
+ return 1;
+ }
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_duktape_object_enc(duk_context *ctx) {
+ duk_hthread *thr = (duk_hthread *) ctx;
+ duk_hstring *h_str;
+
+ DUK_UNREF(thr);
+
+ /* Vararg function: must be careful to check/require arguments.
+ * The JSON helpers accept invalid indices and treat them like
+ * non-existent optional parameters.
+ */
+
+ h_str = duk_require_hstring(ctx, 0);
+ duk_require_valid_index(ctx, 1);
+
+ if (h_str == DUK_HTHREAD_STRING_HEX(thr)) {
+ duk_set_top(ctx, 2);
+ duk_hex_encode(ctx, 1);
+ DUK_ASSERT_TOP(ctx, 2);
+ } else if (h_str == DUK_HTHREAD_STRING_BASE64(thr)) {
+ duk_set_top(ctx, 2);
+ duk_base64_encode(ctx, 1);
+ DUK_ASSERT_TOP(ctx, 2);
+#ifdef DUK_USE_JX
+ } else if (h_str == DUK_HTHREAD_STRING_JX(thr)) {
+ duk_bi_json_stringify_helper(ctx,
+ 1 /*idx_value*/,
+ 2 /*idx_replacer*/,
+ 3 /*idx_space*/,
+ DUK_JSON_FLAG_EXT_CUSTOM |
+ DUK_JSON_FLAG_ASCII_ONLY |
+ DUK_JSON_FLAG_AVOID_KEY_QUOTES /*flags*/);
+#endif
+#ifdef DUK_USE_JC
+ } else if (h_str == DUK_HTHREAD_STRING_JC(thr)) {
+ duk_bi_json_stringify_helper(ctx,
+ 1 /*idx_value*/,
+ 2 /*idx_replacer*/,
+ 3 /*idx_space*/,
+ DUK_JSON_FLAG_EXT_COMPATIBLE |
+ DUK_JSON_FLAG_ASCII_ONLY /*flags*/);
+#endif
+ } else {
+ return DUK_RET_TYPE_ERROR;
+ }
+ return 1;
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_duktape_object_dec(duk_context *ctx) {
+ duk_hthread *thr = (duk_hthread *) ctx;
+ duk_hstring *h_str;
+
+ DUK_UNREF(thr);
+
+ /* Vararg function: must be careful to check/require arguments.
+ * The JSON helpers accept invalid indices and treat them like
+ * non-existent optional parameters.
+ */
+
+ h_str = duk_require_hstring(ctx, 0);
+ duk_require_valid_index(ctx, 1);
+
+ if (h_str == DUK_HTHREAD_STRING_HEX(thr)) {
+ duk_set_top(ctx, 2);
+ duk_hex_decode(ctx, 1);
+ DUK_ASSERT_TOP(ctx, 2);
+ } else if (h_str == DUK_HTHREAD_STRING_BASE64(thr)) {
+ duk_set_top(ctx, 2);
+ duk_base64_decode(ctx, 1);
+ DUK_ASSERT_TOP(ctx, 2);
+#ifdef DUK_USE_JX
+ } else if (h_str == DUK_HTHREAD_STRING_JX(thr)) {
+ duk_bi_json_parse_helper(ctx,
+ 1 /*idx_value*/,
+ 2 /*idx_replacer*/,
+ DUK_JSON_FLAG_EXT_CUSTOM /*flags*/);
+#endif
+#ifdef DUK_USE_JC
+ } else if (h_str == DUK_HTHREAD_STRING_JC(thr)) {
+ duk_bi_json_parse_helper(ctx,
+ 1 /*idx_value*/,
+ 2 /*idx_replacer*/,
+ DUK_JSON_FLAG_EXT_COMPATIBLE /*flags*/);
+#endif
+ } else {
+ return DUK_RET_TYPE_ERROR;
+ }
+ return 1;
+}
+
+/*
+ * Compact an object
+ */
+
+DUK_INTERNAL duk_ret_t duk_bi_duktape_object_compact(duk_context *ctx) {
+ DUK_ASSERT_TOP(ctx, 1);
+ duk_compact(ctx, 0);
+ return 1; /* return the argument object */
+}
projects / ceph.git / blobdiff