--- /dev/null
+/*
+ * Error built-ins
+ */
+
+#include "duk_internal.h"
+
+DUK_INTERNAL duk_ret_t duk_bi_error_constructor_shared(duk_context *ctx) {
+ /* Behavior for constructor and non-constructor call is
+ * the same except for augmenting the created error. When
+ * called as a constructor, the caller (duk_new()) will handle
+ * augmentation; when called as normal function, we need to do
+ * it here.
+ */
+
+ duk_hthread *thr = (duk_hthread *) ctx;
+ duk_small_int_t bidx_prototype = duk_get_current_magic(ctx);
+
+ /* same for both error and each subclass like TypeError */
+ duk_uint_t flags_and_class = DUK_HOBJECT_FLAG_EXTENSIBLE |
+ DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_ERROR);
+
+ DUK_UNREF(thr);
+
+ duk_push_object_helper(ctx, flags_and_class, bidx_prototype);
+
+ /* If message is undefined, the own property 'message' is not set at
+ * all to save property space. An empty message is inherited anyway.
+ */
+ if (!duk_is_undefined(ctx, 0)) {
+ duk_to_string(ctx, 0);
+ duk_dup(ctx, 0); /* [ message error message ] */
+ duk_xdef_prop_stridx(ctx, -2, DUK_STRIDX_MESSAGE, DUK_PROPDESC_FLAGS_WC);
+ }
+
+ /* Augment the error if called as a normal function. __FILE__ and __LINE__
+ * are not desirable in this case.
+ */
+
+#ifdef DUK_USE_AUGMENT_ERROR_CREATE
+ if (!duk_is_constructor_call(ctx)) {
+ duk_err_augment_error_create(thr, thr, NULL, 0, 1 /*noblame_fileline*/);
+ }
+#endif
+
+ return 1;
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_error_prototype_to_string(duk_context *ctx) {
+ /* XXX: optimize with more direct internal access */
+
+ duk_push_this(ctx);
+ (void) duk_require_hobject_or_lfunc_coerce(ctx, -1);
+
+ /* [ ... this ] */
+
+ duk_get_prop_stridx(ctx, -1, DUK_STRIDX_NAME);
+ if (duk_is_undefined(ctx, -1)) {
+ duk_pop(ctx);
+ duk_push_string(ctx, "Error");
+ } else {
+ duk_to_string(ctx, -1);
+ }
+
+ /* [ ... this name ] */
+
+ /* XXX: Are steps 6 and 7 in E5 Section 15.11.4.4 duplicated by
+ * accident or are they actually needed? The first ToString()
+ * could conceivably return 'undefined'.
+ */
+ duk_get_prop_stridx(ctx, -2, DUK_STRIDX_MESSAGE);
+ if (duk_is_undefined(ctx, -1)) {
+ duk_pop(ctx);
+ duk_push_string(ctx, "");
+ } else {
+ duk_to_string(ctx, -1);
+ }
+
+ /* [ ... this name message ] */
+
+ if (duk_get_length(ctx, -2) == 0) {
+ /* name is empty -> return message */
+ return 1;
+ }
+ if (duk_get_length(ctx, -1) == 0) {
+ /* message is empty -> return name */
+ duk_pop(ctx);
+ return 1;
+ }
+ duk_push_string(ctx, ": ");
+ duk_insert(ctx, -2); /* ... name ': ' message */
+ duk_concat(ctx, 3);
+
+ return 1;
+}
+
+#if defined(DUK_USE_TRACEBACKS)
+
+/*
+ * Traceback handling
+ *
+ * The unified helper decodes the traceback and produces various requested
+ * outputs. It should be optimized for size, and may leave garbage on stack,
+ * only the topmost return value matters. For instance, traceback separator
+ * and decoded strings are pushed even when looking for filename only.
+ *
+ * NOTE: although _Tracedata is an internal property, user code can currently
+ * write to the array (or replace it with something other than an array).
+ * The code below must tolerate arbitrary _Tracedata. It can throw errors
+ * etc, but cannot cause a segfault or memory unsafe behavior.
+ */
+
+/* constants arbitrary, chosen for small loads */
+#define DUK__OUTPUT_TYPE_TRACEBACK (-1)
+#define DUK__OUTPUT_TYPE_FILENAME 0
+#define DUK__OUTPUT_TYPE_LINENUMBER 1
+
+DUK_LOCAL duk_ret_t duk__error_getter_helper(duk_context *ctx, duk_small_int_t output_type) {
+ duk_hthread *thr = (duk_hthread *) ctx;
+ duk_idx_t idx_td;
+ duk_small_int_t i; /* traceback depth fits into 16 bits */
+ duk_small_int_t t; /* stack type fits into 16 bits */
+ duk_small_int_t count_func = 0; /* traceback depth ensures fits into 16 bits */
+ const char *str_tailcall = " tailcall";
+ const char *str_strict = " strict";
+ const char *str_construct = " construct";
+ const char *str_prevyield = " preventsyield";
+ const char *str_directeval = " directeval";
+ const char *str_empty = "";
+
+ DUK_ASSERT_TOP(ctx, 0); /* fixed arg count */
+ DUK_UNREF(thr);
+
+ duk_push_this(ctx);
+ duk_get_prop_stridx(ctx, -1, DUK_STRIDX_INT_TRACEDATA);
+ idx_td = duk_get_top_index(ctx);
+
+ duk_push_hstring_stridx(ctx, DUK_STRIDX_NEWLINE_4SPACE);
+ duk_push_this(ctx);
+
+ /* [ ... this tracedata sep this ] */
+
+ /* XXX: skip null filename? */
+
+ if (duk_check_type(ctx, idx_td, DUK_TYPE_OBJECT)) {
+ /* Current tracedata contains 2 entries per callstack entry. */
+ for (i = 0; ; i += 2) {
+ duk_int_t pc;
+ duk_int_t line;
+ duk_int_t flags;
+ duk_double_t d;
+ const char *funcname;
+ const char *filename;
+ duk_hobject *h_func;
+ duk_hstring *h_name;
+
+ duk_require_stack(ctx, 5);
+ duk_get_prop_index(ctx, idx_td, i);
+ duk_get_prop_index(ctx, idx_td, i + 1);
+ d = duk_to_number(ctx, -1);
+ pc = (duk_int_t) DUK_FMOD(d, DUK_DOUBLE_2TO32);
+ flags = (duk_int_t) DUK_FLOOR(d / DUK_DOUBLE_2TO32);
+ t = (duk_small_int_t) duk_get_type(ctx, -2);
+
+ if (t == DUK_TYPE_OBJECT || t == DUK_TYPE_LIGHTFUNC) {
+ /*
+ * Ecmascript/native function call or lightfunc call
+ */
+
+ count_func++;
+
+ /* [ ... v1(func) v2(pc+flags) ] */
+
+ h_func = duk_get_hobject(ctx, -2); /* NULL for lightfunc */
+
+ duk_get_prop_stridx(ctx, -2, DUK_STRIDX_NAME);
+ duk_get_prop_stridx(ctx, -3, DUK_STRIDX_FILE_NAME);
+
+#if defined(DUK_USE_PC2LINE)
+ line = duk_hobject_pc2line_query(ctx, -4, (duk_uint_fast32_t) pc);
+#else
+ line = 0;
+#endif
+
+ /* [ ... v1 v2 name filename ] */
+
+ /* When looking for .fileName/.lineNumber, blame first
+ * function which has a .fileName.
+ */
+ if (duk_is_string(ctx, -1)) {
+ if (output_type == DUK__OUTPUT_TYPE_FILENAME) {
+ return 1;
+ } else if (output_type == DUK__OUTPUT_TYPE_LINENUMBER) {
+ duk_push_int(ctx, line);
+ return 1;
+ }
+ }
+
+ /* XXX: Change 'anon' handling here too, to use empty string for anonymous functions? */
+ /* XXX: Could be improved by coercing to a readable duk_tval (especially string escaping) */
+ h_name = duk_get_hstring(ctx, -2); /* may be NULL */
+ funcname = (h_name == NULL || h_name == DUK_HTHREAD_STRING_EMPTY_STRING(thr)) ?
+ "[anon]" : (const char *) DUK_HSTRING_GET_DATA(h_name);
+ filename = duk_get_string(ctx, -1);
+ filename = filename ? filename : "";
+ DUK_ASSERT(funcname != NULL);
+ DUK_ASSERT(filename != NULL);
+
+ if (h_func == NULL) {
+ duk_push_sprintf(ctx, "at %s light%s%s%s%s%s",
+ (const char *) funcname,
+ (const char *) ((flags & DUK_ACT_FLAG_STRICT) ? str_strict : str_empty),
+ (const char *) ((flags & DUK_ACT_FLAG_TAILCALLED) ? str_tailcall : str_empty),
+ (const char *) ((flags & DUK_ACT_FLAG_CONSTRUCT) ? str_construct : str_empty),
+ (const char *) ((flags & DUK_ACT_FLAG_DIRECT_EVAL) ? str_directeval : str_empty),
+ (const char *) ((flags & DUK_ACT_FLAG_PREVENT_YIELD) ? str_prevyield : str_empty));
+ } else if (DUK_HOBJECT_HAS_NATIVEFUNCTION(h_func)) {
+ duk_push_sprintf(ctx, "at %s (%s) native%s%s%s%s%s",
+ (const char *) funcname,
+ (const char *) filename,
+ (const char *) ((flags & DUK_ACT_FLAG_STRICT) ? str_strict : str_empty),
+ (const char *) ((flags & DUK_ACT_FLAG_TAILCALLED) ? str_tailcall : str_empty),
+ (const char *) ((flags & DUK_ACT_FLAG_CONSTRUCT) ? str_construct : str_empty),
+ (const char *) ((flags & DUK_ACT_FLAG_DIRECT_EVAL) ? str_directeval : str_empty),
+ (const char *) ((flags & DUK_ACT_FLAG_PREVENT_YIELD) ? str_prevyield : str_empty));
+ } else {
+ duk_push_sprintf(ctx, "at %s (%s:%ld)%s%s%s%s%s",
+ (const char *) funcname,
+ (const char *) filename,
+ (long) line,
+ (const char *) ((flags & DUK_ACT_FLAG_STRICT) ? str_strict : str_empty),
+ (const char *) ((flags & DUK_ACT_FLAG_TAILCALLED) ? str_tailcall : str_empty),
+ (const char *) ((flags & DUK_ACT_FLAG_CONSTRUCT) ? str_construct : str_empty),
+ (const char *) ((flags & DUK_ACT_FLAG_DIRECT_EVAL) ? str_directeval : str_empty),
+ (const char *) ((flags & DUK_ACT_FLAG_PREVENT_YIELD) ? str_prevyield : str_empty));
+ }
+ duk_replace(ctx, -5); /* [ ... v1 v2 name filename str ] -> [ ... str v2 name filename ] */
+ duk_pop_n(ctx, 3); /* -> [ ... str ] */
+ } else if (t == DUK_TYPE_STRING) {
+ /*
+ * __FILE__ / __LINE__ entry, here 'pc' is line number directly.
+ * Sometimes __FILE__ / __LINE__ is reported as the source for
+ * the error (fileName, lineNumber), sometimes not.
+ */
+
+ /* [ ... v1(filename) v2(line+flags) ] */
+
+ /* When looking for .fileName/.lineNumber, blame compilation
+ * or C call site unless flagged not to do so.
+ */
+ if (!(flags & DUK_TB_FLAG_NOBLAME_FILELINE)) {
+ if (output_type == DUK__OUTPUT_TYPE_FILENAME) {
+ duk_pop(ctx);
+ return 1;
+ } else if (output_type == DUK__OUTPUT_TYPE_LINENUMBER) {
+ duk_push_int(ctx, pc);
+ return 1;
+ }
+ }
+
+ duk_push_sprintf(ctx, "at [anon] (%s:%ld) internal",
+ (const char *) duk_get_string(ctx, -2), (long) pc);
+ duk_replace(ctx, -3); /* [ ... v1 v2 str ] -> [ ... str v2 ] */
+ duk_pop(ctx); /* -> [ ... str ] */
+ } else {
+ /* unknown, ignore */
+ duk_pop_2(ctx);
+ break;
+ }
+ }
+
+ if (count_func >= DUK_USE_TRACEBACK_DEPTH) {
+ /* Possibly truncated; there is no explicit truncation
+ * marker so this is the best we can do.
+ */
+
+ duk_push_hstring_stridx(ctx, DUK_STRIDX_BRACKETED_ELLIPSIS);
+ }
+ }
+
+ /* [ ... this tracedata sep this str1 ... strN ] */
+
+ if (output_type != DUK__OUTPUT_TYPE_TRACEBACK) {
+ return 0;
+ } else {
+ /* The 'this' after 'sep' will get ToString() coerced by
+ * duk_join() automatically. We don't want to do that
+ * coercion when providing .fileName or .lineNumber (GH-254).
+ */
+ duk_join(ctx, duk_get_top(ctx) - (idx_td + 2) /*count, not including sep*/);
+ return 1;
+ }
+}
+
+/* XXX: Output type could be encoded into native function 'magic' value to
+ * save space. For setters the stridx could be encoded into 'magic'.
+ */
+
+DUK_INTERNAL duk_ret_t duk_bi_error_prototype_stack_getter(duk_context *ctx) {
+ return duk__error_getter_helper(ctx, DUK__OUTPUT_TYPE_TRACEBACK);
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_error_prototype_filename_getter(duk_context *ctx) {
+ return duk__error_getter_helper(ctx, DUK__OUTPUT_TYPE_FILENAME);
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_error_prototype_linenumber_getter(duk_context *ctx) {
+ return duk__error_getter_helper(ctx, DUK__OUTPUT_TYPE_LINENUMBER);
+}
+
+#undef DUK__OUTPUT_TYPE_TRACEBACK
+#undef DUK__OUTPUT_TYPE_FILENAME
+#undef DUK__OUTPUT_TYPE_LINENUMBER
+
+#else /* DUK_USE_TRACEBACKS */
+
+/*
+ * Traceback handling when tracebacks disabled.
+ *
+ * The fileName / lineNumber stubs are now necessary because built-in
+ * data will include the accessor properties in Error.prototype. If those
+ * are removed for builds without tracebacks, these can also be removed.
+ * 'stack' should still be present and produce a ToString() equivalent:
+ * this is useful for user code which prints a stacktrace and expects to
+ * see something useful. A normal stacktrace also begins with a ToString()
+ * of the error so this makes sense.
+ */
+
+DUK_INTERNAL duk_ret_t duk_bi_error_prototype_stack_getter(duk_context *ctx) {
+ /* XXX: remove this native function and map 'stack' accessor
+ * to the toString() implementation directly.
+ */
+ return duk_bi_error_prototype_to_string(ctx);
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_error_prototype_filename_getter(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return 0;
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_error_prototype_linenumber_getter(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return 0;
+}
+
+#endif /* DUK_USE_TRACEBACKS */
+
+DUK_LOCAL duk_ret_t duk__error_setter_helper(duk_context *ctx, duk_small_uint_t stridx_key) {
+ /* Attempt to write 'stack', 'fileName', 'lineNumber' works as if
+ * user code called Object.defineProperty() to create an overriding
+ * own property. This allows user code to overwrite .fileName etc
+ * intuitively as e.g. "err.fileName = 'dummy'" as one might expect.
+ * See https://github.com/svaarala/duktape/issues/387.
+ */
+
+ DUK_ASSERT_TOP(ctx, 1); /* fixed arg count: value */
+
+ duk_push_this(ctx);
+ duk_push_hstring_stridx(ctx, (duk_small_int_t) stridx_key);
+ duk_dup(ctx, 0);
+
+ /* [ ... obj key value ] */
+
+ DUK_DD(DUK_DDPRINT("error setter: %!T %!T %!T",
+ duk_get_tval(ctx, -3), duk_get_tval(ctx, -2), duk_get_tval(ctx, -1)));
+
+ duk_def_prop(ctx, -3, DUK_DEFPROP_HAVE_VALUE |
+ DUK_DEFPROP_HAVE_WRITABLE | DUK_DEFPROP_WRITABLE |
+ DUK_DEFPROP_HAVE_ENUMERABLE | /*not enumerable*/
+ DUK_DEFPROP_HAVE_CONFIGURABLE | DUK_DEFPROP_CONFIGURABLE);
+ return 0;
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_error_prototype_stack_setter(duk_context *ctx) {
+ return duk__error_setter_helper(ctx, DUK_STRIDX_STACK);
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_error_prototype_filename_setter(duk_context *ctx) {
+ return duk__error_setter_helper(ctx, DUK_STRIDX_FILE_NAME);
+}
+
+DUK_INTERNAL duk_ret_t duk_bi_error_prototype_linenumber_setter(duk_context *ctx) {
+ return duk__error_setter_helper(ctx, DUK_STRIDX_LINE_NUMBER);
+}
projects / ceph.git / blobdiff