589 lines
20 KiB
C
589 lines
20 KiB
C
/*
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* Augmenting errors at their creation site and their throw site.
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*
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* When errors are created, traceback data is added by built-in code
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* and a user error handler (if defined) can process or replace the
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* error. Similarly, when errors are thrown, a user error handler
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* (if defined) can process or replace the error.
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*
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* Augmentation and other processing at error creation time is nice
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* because an error is only created once, but it may be thrown and
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* rethrown multiple times. User error handler registered for processing
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* an error at its throw site must be careful to handle rethrowing in
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* a useful manner.
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*
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* Error augmentation may throw an internal error (e.g. alloc error).
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*
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* ECMAScript allows throwing any values, so all values cannot be
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* augmented. Currently, the built-in augmentation at error creation
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* only augments error values which are Error instances (= have the
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* built-in Error.prototype in their prototype chain) and are also
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* extensible. User error handlers have no limitations in this respect.
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*/
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#include "third_party/duktape/duk_internal.h"
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/*
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* Helper for calling a user error handler.
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*
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* 'thr' must be the currently active thread; the error handler is called
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* in its context. The valstack of 'thr' must have the error value on
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* top, and will be replaced by another error value based on the return
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* value of the error handler.
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*
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* The helper calls duk_handle_call() recursively in protected mode.
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* Before that call happens, no longjmps should happen; as a consequence,
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* we must assume that the valstack contains enough temporary space for
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* arguments and such.
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*
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* While the error handler runs, any errors thrown will not trigger a
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* recursive error handler call (this is implemented using a heap level
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* flag which will "follow" through any coroutines resumed inside the
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* error handler). If the error handler is not callable or throws an
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* error, the resulting error replaces the original error (for Duktape
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* internal errors, duk_error_throw.c further substitutes this error with
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* a DoubleError which is not ideal). This would be easy to change and
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* even signal to the caller.
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*
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* The user error handler is stored in 'Duktape.errCreate' or
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* 'Duktape.errThrow' depending on whether we're augmenting the error at
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* creation or throw time. There are several alternatives to this approach,
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* see doc/error-objects.rst for discussion.
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*
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* Note: since further longjmp()s may occur while calling the error handler
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* (for many reasons, e.g. a labeled 'break' inside the handler), the
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* caller can make no assumptions on the thr->heap->lj state after the
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* call (this affects especially duk_error_throw.c). This is not an issue
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* as long as the caller writes to the lj state only after the error handler
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* finishes.
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*/
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#if defined(DUK_USE_ERRTHROW) || defined(DUK_USE_ERRCREATE)
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DUK_LOCAL void duk__err_augment_user(duk_hthread *thr, duk_small_uint_t stridx_cb) {
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duk_tval *tv_hnd;
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duk_int_t rc;
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DUK_ASSERT(thr != NULL);
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DUK_ASSERT(thr->heap != NULL);
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DUK_ASSERT_STRIDX_VALID(stridx_cb);
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if (thr->heap->augmenting_error) {
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DUK_D(DUK_DPRINT("recursive call to error augmentation, ignore"));
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return;
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}
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/*
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* Check whether or not we have an error handler.
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*
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* We must be careful of not triggering an error when looking up the
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* property. For instance, if the property is a getter, we don't want
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* to call it, only plain values are allowed. The value, if it exists,
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* is not checked. If the value is not a function, a TypeError happens
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* when it is called and that error replaces the original one.
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*/
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DUK_ASSERT_VALSTACK_SPACE(thr, 4); /* 3 entries actually needed below */
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/* [ ... errval ] */
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if (thr->builtins[DUK_BIDX_DUKTAPE] == NULL) {
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/* When creating built-ins, some of the built-ins may not be set
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* and we want to tolerate that when throwing errors.
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*/
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DUK_DD(DUK_DDPRINT("error occurred when DUK_BIDX_DUKTAPE is NULL, ignoring"));
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return;
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}
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tv_hnd = duk_hobject_find_entry_tval_ptr_stridx(thr->heap,
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thr->builtins[DUK_BIDX_DUKTAPE],
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stridx_cb);
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if (tv_hnd == NULL) {
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DUK_DD(DUK_DDPRINT("error handler does not exist or is not a plain value: %!T",
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(duk_tval *) tv_hnd));
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return;
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}
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DUK_DDD(DUK_DDDPRINT("error handler dump (callability not checked): %!T",
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(duk_tval *) tv_hnd));
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duk_push_tval(thr, tv_hnd);
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/* [ ... errval errhandler ] */
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duk_insert(thr, -2); /* -> [ ... errhandler errval ] */
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duk_push_undefined(thr);
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duk_insert(thr, -2); /* -> [ ... errhandler undefined(= this) errval ] */
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/* [ ... errhandler undefined errval ] */
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/*
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* heap->augmenting_error prevents recursive re-entry and also causes
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* call handling to use a larger (but not unbounded) call stack limit
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* for the duration of error augmentation.
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*
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* We ignore errors now: a success return and an error value both
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* replace the original error value. (This would be easy to change.)
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*/
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DUK_ASSERT(thr->heap->augmenting_error == 0);
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thr->heap->augmenting_error = 1;
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rc = duk_pcall_method(thr, 1);
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DUK_UNREF(rc); /* no need to check now: both success and error are OK */
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DUK_ASSERT(thr->heap->augmenting_error == 1);
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thr->heap->augmenting_error = 0;
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/* [ ... errval ] */
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}
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#endif /* DUK_USE_ERRTHROW || DUK_USE_ERRCREATE */
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/*
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* Add ._Tracedata to an error on the stack top.
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*/
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#if defined(DUK_USE_TRACEBACKS)
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DUK_LOCAL void duk__add_traceback(duk_hthread *thr, duk_hthread *thr_callstack, const char *c_filename, duk_int_t c_line, duk_small_uint_t flags) {
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duk_activation *act;
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duk_int_t depth;
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duk_int_t arr_size;
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duk_tval *tv;
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duk_hstring *s;
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duk_uint32_t u32;
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duk_double_t d;
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DUK_ASSERT(thr != NULL);
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DUK_ASSERT(thr_callstack != NULL);
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/* [ ... error ] */
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/*
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* The traceback format is pretty arcane in an attempt to keep it compact
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* and cheap to create. It may change arbitrarily from version to version.
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* It should be decoded/accessed through version specific accessors only.
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*
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* See doc/error-objects.rst.
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*/
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DUK_DDD(DUK_DDDPRINT("adding traceback to object: %!T",
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(duk_tval *) duk_get_tval(thr, -1)));
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/* Preallocate array to correct size, so that we can just write out
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* the _Tracedata values into the array part.
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*/
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act = thr->callstack_curr;
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depth = DUK_USE_TRACEBACK_DEPTH;
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DUK_ASSERT(thr_callstack->callstack_top <= DUK_INT_MAX); /* callstack limits */
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if (depth > (duk_int_t) thr_callstack->callstack_top) {
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depth = (duk_int_t) thr_callstack->callstack_top;
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}
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if (depth > 0) {
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if (flags & DUK_AUGMENT_FLAG_SKIP_ONE) {
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DUK_ASSERT(act != NULL);
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act = act->parent;
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depth--;
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}
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}
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arr_size = depth * 2;
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if (thr->compile_ctx != NULL && thr->compile_ctx->h_filename != NULL) {
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arr_size += 2;
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}
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if (c_filename) {
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/* We need the C filename to be interned before getting the
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* array part pointer to avoid any GC interference while the
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* array part is populated.
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*/
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duk_push_string(thr, c_filename);
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arr_size += 2;
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}
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/* XXX: Uninitialized would be OK. Maybe add internal primitive to
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* push bare duk_harray with size?
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*/
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DUK_D(DUK_DPRINT("preallocated _Tracedata to %ld items", (long) arr_size));
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tv = duk_push_harray_with_size_outptr(thr, (duk_uint32_t) arr_size);
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duk_clear_prototype(thr, -1);
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DUK_ASSERT(duk_is_bare_object(thr, -1));
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DUK_ASSERT(arr_size == 0 || tv != NULL);
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/* Compiler SyntaxErrors (and other errors) come first, and are
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* blamed by default (not flagged "noblame").
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*/
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if (thr->compile_ctx != NULL && thr->compile_ctx->h_filename != NULL) {
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s = thr->compile_ctx->h_filename;
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DUK_TVAL_SET_STRING(tv, s);
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DUK_HSTRING_INCREF(thr, s);
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tv++;
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u32 = (duk_uint32_t) thr->compile_ctx->curr_token.start_line; /* (flags<<32) + (line), flags = 0 */
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DUK_TVAL_SET_U32(tv, u32);
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tv++;
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}
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/* Filename/line from C macros (__FILE__, __LINE__) are added as an
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* entry with a special format: (string, number). The number contains
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* the line and flags.
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*/
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/* [ ... error c_filename? arr ] */
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if (c_filename) {
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DUK_ASSERT(DUK_TVAL_IS_STRING(thr->valstack_top - 2));
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s = DUK_TVAL_GET_STRING(thr->valstack_top - 2); /* interned c_filename */
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DUK_ASSERT(s != NULL);
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DUK_TVAL_SET_STRING(tv, s);
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DUK_HSTRING_INCREF(thr, s);
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tv++;
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d = ((flags & DUK_AUGMENT_FLAG_NOBLAME_FILELINE) ? ((duk_double_t) DUK_TB_FLAG_NOBLAME_FILELINE) * DUK_DOUBLE_2TO32 : 0.0) +
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(duk_double_t) c_line;
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DUK_TVAL_SET_DOUBLE(tv, d);
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tv++;
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}
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/* Traceback depth doesn't take into account the filename/line
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* special handling above (intentional).
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*/
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for (; depth-- > 0; act = act->parent) {
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duk_uint32_t pc;
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duk_tval *tv_src;
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/* [... arr] */
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DUK_ASSERT(act != NULL); /* depth check above, assumes book-keeping is correct */
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DUK_ASSERT_DISABLE(act->pc >= 0); /* unsigned */
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/* Add function object. */
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tv_src = &act->tv_func; /* object (function) or lightfunc */
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DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv_src) || DUK_TVAL_IS_LIGHTFUNC(tv_src));
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DUK_TVAL_SET_TVAL(tv, tv_src);
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DUK_TVAL_INCREF(thr, tv);
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tv++;
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/* Add a number containing: pc, activation flags.
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*
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* PC points to next instruction, find offending PC. Note that
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* PC == 0 for native code.
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*/
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pc = (duk_uint32_t) duk_hthread_get_act_prev_pc(thr_callstack, act);
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DUK_ASSERT_DISABLE(pc >= 0); /* unsigned */
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DUK_ASSERT((duk_double_t) pc < DUK_DOUBLE_2TO32); /* assume PC is at most 32 bits and non-negative */
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d = ((duk_double_t) act->flags) * DUK_DOUBLE_2TO32 + (duk_double_t) pc;
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DUK_TVAL_SET_DOUBLE(tv, d);
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tv++;
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}
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#if defined(DUK_USE_ASSERTIONS)
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{
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duk_harray *a;
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a = (duk_harray *) duk_known_hobject(thr, -1);
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DUK_ASSERT(a != NULL);
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DUK_ASSERT((duk_uint32_t) (tv - DUK_HOBJECT_A_GET_BASE(thr->heap, (duk_hobject *) a)) == a->length);
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DUK_ASSERT(a->length == (duk_uint32_t) arr_size);
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DUK_ASSERT(duk_is_bare_object(thr, -1));
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}
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#endif
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/* [ ... error c_filename? arr ] */
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if (c_filename) {
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duk_remove_m2(thr);
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}
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/* [ ... error arr ] */
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duk_xdef_prop_stridx_short_wec(thr, -2, DUK_STRIDX_INT_TRACEDATA); /* -> [ ... error ] */
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}
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#endif /* DUK_USE_TRACEBACKS */
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/*
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* Add .fileName and .lineNumber to an error on the stack top.
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*/
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#if defined(DUK_USE_AUGMENT_ERROR_CREATE) && !defined(DUK_USE_TRACEBACKS)
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DUK_LOCAL void duk__add_fileline(duk_hthread *thr, duk_hthread *thr_callstack, const char *c_filename, duk_int_t c_line, duk_small_uint_t flags) {
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#if defined(DUK_USE_ASSERTIONS)
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duk_int_t entry_top;
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#endif
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#if defined(DUK_USE_ASSERTIONS)
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entry_top = duk_get_top(thr);
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#endif
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/*
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* If tracebacks are disabled, 'fileName' and 'lineNumber' are added
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* as plain own properties. Since Error.prototype has accessors of
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* the same name, we need to define own properties directly (cannot
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* just use e.g. duk_put_prop_stridx). Existing properties are not
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* overwritten in case they already exist.
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*/
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if (thr->compile_ctx != NULL && thr->compile_ctx->h_filename != NULL) {
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/* Compiler SyntaxError (or other error) gets the primary blame.
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* Currently no flag to prevent blaming.
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*/
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duk_push_uint(thr, (duk_uint_t) thr->compile_ctx->curr_token.start_line);
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duk_push_hstring(thr, thr->compile_ctx->h_filename);
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} else if (c_filename && (flags & DUK_AUGMENT_FLAG_NOBLAME_FILELINE) == 0) {
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/* C call site gets blamed next, unless flagged not to do so.
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* XXX: file/line is disabled in minimal builds, so disable this
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* too when appropriate.
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*/
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duk_push_int(thr, c_line);
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duk_push_string(thr, c_filename);
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} else {
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/* Finally, blame the innermost callstack entry which has a
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* .fileName property.
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*/
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duk_small_uint_t depth;
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duk_uint32_t ecma_line;
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duk_activation *act;
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DUK_ASSERT(thr_callstack->callstack_top <= DUK_INT_MAX); /* callstack limits */
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depth = DUK_USE_TRACEBACK_DEPTH;
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if (depth > thr_callstack->callstack_top) {
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depth = thr_callstack->callstack_top;
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}
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for (act = thr_callstack->callstack_curr; depth-- > 0; act = act->parent) {
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duk_hobject *func;
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duk_uint32_t pc;
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DUK_ASSERT(act != NULL);
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func = DUK_ACT_GET_FUNC(act);
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if (func == NULL) {
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/* Lightfunc, not blamed now. */
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continue;
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}
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/* PC points to next instruction, find offending PC,
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* PC == 0 for native code.
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*/
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pc = duk_hthread_get_act_prev_pc(thr, act); /* thr argument only used for thr->heap, so specific thread doesn't matter */
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DUK_UNREF(pc);
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DUK_ASSERT_DISABLE(pc >= 0); /* unsigned */
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DUK_ASSERT((duk_double_t) pc < DUK_DOUBLE_2TO32); /* assume PC is at most 32 bits and non-negative */
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duk_push_hobject(thr, func);
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/* [ ... error func ] */
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duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_FILE_NAME);
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if (!duk_is_string_notsymbol(thr, -1)) {
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duk_pop_2(thr);
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continue;
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}
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/* [ ... error func fileName ] */
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ecma_line = 0;
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#if defined(DUK_USE_PC2LINE)
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if (DUK_HOBJECT_IS_COMPFUNC(func)) {
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ecma_line = duk_hobject_pc2line_query(thr, -2, (duk_uint_fast32_t) pc);
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} else {
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/* Native function, no relevant lineNumber. */
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}
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#endif /* DUK_USE_PC2LINE */
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duk_push_u32(thr, ecma_line);
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/* [ ... error func fileName lineNumber ] */
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duk_replace(thr, -3);
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/* [ ... error lineNumber fileName ] */
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goto define_props;
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}
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/* No activation matches, use undefined for both .fileName and
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* .lineNumber (matches what we do with a _Tracedata based
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* no-match lookup.
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*/
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duk_push_undefined(thr);
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duk_push_undefined(thr);
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}
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define_props:
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/* [ ... error lineNumber fileName ] */
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#if defined(DUK_USE_ASSERTIONS)
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DUK_ASSERT(duk_get_top(thr) == entry_top + 2);
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#endif
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duk_xdef_prop_stridx_short(thr, -3, DUK_STRIDX_FILE_NAME, DUK_PROPDESC_FLAGS_C | DUK_PROPDESC_FLAG_NO_OVERWRITE);
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duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_LINE_NUMBER, DUK_PROPDESC_FLAGS_C | DUK_PROPDESC_FLAG_NO_OVERWRITE);
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}
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#endif /* DUK_USE_AUGMENT_ERROR_CREATE && !DUK_USE_TRACEBACKS */
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/*
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* Add line number to a compiler error.
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*/
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#if defined(DUK_USE_AUGMENT_ERROR_CREATE)
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DUK_LOCAL void duk__add_compiler_error_line(duk_hthread *thr) {
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/* Append a "(line NNN)" to the "message" property of any error
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* thrown during compilation. Usually compilation errors are
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* SyntaxErrors but they can also be out-of-memory errors and
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* the like.
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*/
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/* [ ... error ] */
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DUK_ASSERT(duk_is_object(thr, -1));
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if (!(thr->compile_ctx != NULL && thr->compile_ctx->h_filename != NULL)) {
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return;
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}
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DUK_DDD(DUK_DDDPRINT("compile error, before adding line info: %!T",
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(duk_tval *) duk_get_tval(thr, -1)));
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if (duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_MESSAGE)) {
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duk_bool_t at_end;
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/* Best guesstimate that error occurred at end of input, token
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* truncated by end of input, etc.
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*/
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#if 0
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at_end = (thr->compile_ctx->curr_token.start_offset + 1 >= thr->compile_ctx->lex.input_length);
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at_end = (thr->compile_ctx->lex.window[0].codepoint < 0 || thr->compile_ctx->lex.window[1].codepoint < 0);
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#endif
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at_end = (thr->compile_ctx->lex.window[0].codepoint < 0);
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|
|
DUK_D(DUK_DPRINT("syntax error, determined at_end=%ld; curr_token.start_offset=%ld, "
|
|
"lex.input_length=%ld, window[0].codepoint=%ld, window[1].codepoint=%ld",
|
|
(long) at_end,
|
|
(long) thr->compile_ctx->curr_token.start_offset,
|
|
(long) thr->compile_ctx->lex.input_length,
|
|
(long) thr->compile_ctx->lex.window[0].codepoint,
|
|
(long) thr->compile_ctx->lex.window[1].codepoint));
|
|
|
|
duk_push_sprintf(thr, " (line %ld%s)",
|
|
(long) thr->compile_ctx->curr_token.start_line,
|
|
at_end ? ", end of input" : "");
|
|
duk_concat(thr, 2);
|
|
duk_put_prop_stridx_short(thr, -2, DUK_STRIDX_MESSAGE);
|
|
} else {
|
|
duk_pop(thr);
|
|
}
|
|
|
|
DUK_DDD(DUK_DDDPRINT("compile error, after adding line info: %!T",
|
|
(duk_tval *) duk_get_tval(thr, -1)));
|
|
}
|
|
#endif /* DUK_USE_AUGMENT_ERROR_CREATE */
|
|
|
|
/*
|
|
* Augment an error being created using Duktape specific properties
|
|
* like _Tracedata or .fileName/.lineNumber.
|
|
*/
|
|
|
|
#if defined(DUK_USE_AUGMENT_ERROR_CREATE)
|
|
DUK_LOCAL void duk__err_augment_builtin_create(duk_hthread *thr, duk_hthread *thr_callstack, const char *c_filename, duk_int_t c_line, duk_hobject *obj, duk_small_uint_t flags) {
|
|
#if defined(DUK_USE_ASSERTIONS)
|
|
duk_int_t entry_top;
|
|
#endif
|
|
|
|
#if defined(DUK_USE_ASSERTIONS)
|
|
entry_top = duk_get_top(thr);
|
|
#endif
|
|
DUK_ASSERT(obj != NULL);
|
|
|
|
DUK_UNREF(obj); /* unreferenced w/o tracebacks */
|
|
|
|
duk__add_compiler_error_line(thr);
|
|
|
|
#if defined(DUK_USE_TRACEBACKS)
|
|
/* If tracebacks are enabled, the '_Tracedata' property is the only
|
|
* thing we need: 'fileName' and 'lineNumber' are virtual properties
|
|
* which use '_Tracedata'. (Check _Tracedata only as own property.)
|
|
*/
|
|
if (duk_hobject_find_entry_tval_ptr_stridx(thr->heap, obj, DUK_STRIDX_INT_TRACEDATA) != NULL) {
|
|
DUK_DDD(DUK_DDDPRINT("error value already has a '_Tracedata' property, not modifying it"));
|
|
} else {
|
|
duk__add_traceback(thr, thr_callstack, c_filename, c_line, flags);
|
|
}
|
|
#else
|
|
/* Without tracebacks the concrete .fileName and .lineNumber need
|
|
* to be added directly.
|
|
*/
|
|
duk__add_fileline(thr, thr_callstack, c_filename, c_line, flags);
|
|
#endif
|
|
|
|
#if defined(DUK_USE_ASSERTIONS)
|
|
DUK_ASSERT(duk_get_top(thr) == entry_top);
|
|
#endif
|
|
}
|
|
#endif /* DUK_USE_AUGMENT_ERROR_CREATE */
|
|
|
|
/*
|
|
* Augment an error at creation time with _Tracedata/fileName/lineNumber
|
|
* and allow a user error handler (if defined) to process/replace the error.
|
|
* The error to be augmented is at the stack top.
|
|
*
|
|
* thr: thread containing the error value
|
|
* thr_callstack: thread which should be used for generating callstack etc.
|
|
* c_filename: C __FILE__ related to the error
|
|
* c_line: C __LINE__ related to the error
|
|
* flags & DUK_AUGMENT_FLAG_NOBLAME_FILELINE:
|
|
* if true, don't fileName/line as error source, otherwise use traceback
|
|
* (needed because user code filename/line are reported but internal ones
|
|
* are not)
|
|
*/
|
|
|
|
#if defined(DUK_USE_AUGMENT_ERROR_CREATE)
|
|
DUK_INTERNAL void duk_err_augment_error_create(duk_hthread *thr, duk_hthread *thr_callstack, const char *c_filename, duk_int_t c_line, duk_small_uint_t flags) {
|
|
duk_hobject *obj;
|
|
|
|
DUK_ASSERT(thr != NULL);
|
|
DUK_ASSERT(thr_callstack != NULL);
|
|
|
|
/* [ ... error ] */
|
|
|
|
/*
|
|
* Criteria for augmenting:
|
|
*
|
|
* - augmentation enabled in build (naturally)
|
|
* - error value internal prototype chain contains the built-in
|
|
* Error prototype object (i.e. 'val instanceof Error')
|
|
*
|
|
* Additional criteria for built-in augmenting:
|
|
*
|
|
* - error value is an extensible object
|
|
*/
|
|
|
|
obj = duk_get_hobject(thr, -1);
|
|
if (!obj) {
|
|
DUK_DDD(DUK_DDDPRINT("value is not an object, skip both built-in and user augment"));
|
|
return;
|
|
}
|
|
if (!duk_hobject_prototype_chain_contains(thr, obj, thr->builtins[DUK_BIDX_ERROR_PROTOTYPE], 1 /*ignore_loop*/)) {
|
|
/* If the value has a prototype loop, it's critical not to
|
|
* throw here. Instead, assume the value is not to be
|
|
* augmented.
|
|
*/
|
|
DUK_DDD(DUK_DDDPRINT("value is not an error instance, skip both built-in and user augment"));
|
|
return;
|
|
}
|
|
if (DUK_HOBJECT_HAS_EXTENSIBLE(obj)) {
|
|
DUK_DDD(DUK_DDDPRINT("error meets criteria, built-in augment"));
|
|
duk__err_augment_builtin_create(thr, thr_callstack, c_filename, c_line, obj, flags);
|
|
} else {
|
|
DUK_DDD(DUK_DDDPRINT("error does not meet criteria, no built-in augment"));
|
|
}
|
|
|
|
/* [ ... error ] */
|
|
|
|
#if defined(DUK_USE_ERRCREATE)
|
|
duk__err_augment_user(thr, DUK_STRIDX_ERR_CREATE);
|
|
#endif
|
|
}
|
|
#endif /* DUK_USE_AUGMENT_ERROR_CREATE */
|
|
|
|
/*
|
|
* Augment an error at throw time; allow a user error handler (if defined)
|
|
* to process/replace the error. The error to be augmented is at the
|
|
* stack top.
|
|
*/
|
|
|
|
#if defined(DUK_USE_AUGMENT_ERROR_THROW)
|
|
DUK_INTERNAL void duk_err_augment_error_throw(duk_hthread *thr) {
|
|
#if defined(DUK_USE_ERRTHROW)
|
|
duk__err_augment_user(thr, DUK_STRIDX_ERR_THROW);
|
|
#endif /* DUK_USE_ERRTHROW */
|
|
}
|
|
#endif /* DUK_USE_AUGMENT_ERROR_THROW */
|