http://git-wip-us.apache.org/repos/asf/nifi-minifi-cpp/blob/ede68a10/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_js_call.c ---------------------------------------------------------------------- diff --git a/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_js_call.c b/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_js_call.c deleted file mode 100644 index 7dc04ed..0000000 --- a/thirdparty/civetweb-1.10/src/third_party/duktape-1.5.2/src-separate/duk_js_call.c +++ /dev/null @@ -1,2727 +0,0 @@ -/* - * Call handling. - * - * Main functions are: - * - * - duk_handle_call_unprotected(): unprotected call to Ecmascript or - * Duktape/C function - * - duk_handle_call_protected(): protected call to Ecmascript or - * Duktape/C function - * - duk_handle_safe_call(): make a protected C call within current - * activation - * - duk_handle_ecma_call_setup(): Ecmascript-to-Ecmascript calls - * (not always possible), including tail calls and coroutine resume - * - * See 'execution.rst'. - * - * Note: setjmp() and local variables have a nasty interaction, - * see execution.rst; non-volatile locals modified after setjmp() - * call are not guaranteed to keep their value. - */ - -#include "duk_internal.h" - -/* - * Forward declarations. - */ - -DUK_LOCAL void duk__handle_call_inner(duk_hthread *thr, - duk_idx_t num_stack_args, - duk_small_uint_t call_flags, - duk_idx_t idx_func); -DUK_LOCAL void duk__handle_call_error(duk_hthread *thr, - duk_size_t entry_valstack_bottom_index, - duk_size_t entry_valstack_end, - duk_size_t entry_catchstack_top, - duk_size_t entry_callstack_top, - duk_int_t entry_call_recursion_depth, - duk_hthread *entry_curr_thread, - duk_uint_fast8_t entry_thread_state, - duk_instr_t **entry_ptr_curr_pc, - duk_idx_t idx_func, - duk_jmpbuf *old_jmpbuf_ptr); -DUK_LOCAL void duk__handle_safe_call_inner(duk_hthread *thr, - duk_safe_call_function func, - duk_idx_t idx_retbase, - duk_idx_t num_stack_rets, - duk_size_t entry_valstack_bottom_index, - duk_size_t entry_callstack_top, - duk_size_t entry_catchstack_top); -DUK_LOCAL void duk__handle_safe_call_error(duk_hthread *thr, - duk_idx_t idx_retbase, - duk_idx_t num_stack_rets, - duk_size_t entry_valstack_bottom_index, - duk_size_t entry_callstack_top, - duk_size_t entry_catchstack_top, - duk_jmpbuf *old_jmpbuf_ptr); -DUK_LOCAL void duk__handle_safe_call_shared(duk_hthread *thr, - duk_idx_t idx_retbase, - duk_idx_t num_stack_rets, - duk_int_t entry_call_recursion_depth, - duk_hthread *entry_curr_thread, - duk_uint_fast8_t entry_thread_state, - duk_instr_t **entry_ptr_curr_pc); - -/* - * Interrupt counter fixup (for development only). - */ - -#if defined(DUK_USE_INTERRUPT_COUNTER) && defined(DUK_USE_DEBUG) -DUK_LOCAL void duk__interrupt_fixup(duk_hthread *thr, duk_hthread *entry_curr_thread) { - /* Currently the bytecode executor and executor interrupt - * instruction counts are off because we don't execute the - * interrupt handler when we're about to exit from the initial - * user call into Duktape. - * - * If we were to execute the interrupt handler here, the counts - * would match. You can enable this block manually to check - * that this is the case. - */ - - DUK_ASSERT(thr != NULL); - DUK_ASSERT(thr->heap != NULL); - -#if defined(DUK_USE_INTERRUPT_DEBUG_FIXUP) - if (entry_curr_thread == NULL) { - thr->interrupt_init = thr->interrupt_init - thr->interrupt_counter; - thr->heap->inst_count_interrupt += thr->interrupt_init; - DUK_DD(DUK_DDPRINT("debug test: updated interrupt count on exit to " - "user code, instruction counts: executor=%ld, interrupt=%ld", - (long) thr->heap->inst_count_exec, (long) thr->heap->inst_count_interrupt)); - DUK_ASSERT(thr->heap->inst_count_exec == thr->heap->inst_count_interrupt); - } -#else - DUK_UNREF(thr); - DUK_UNREF(entry_curr_thread); -#endif -} -#endif - -/* - * Arguments object creation. - * - * Creating arguments objects involves many small details, see E5 Section - * 10.6 for the specific requirements. Much of the arguments object exotic - * behavior is implemented in duk_hobject_props.c, and is enabled by the - * object flag DUK_HOBJECT_FLAG_EXOTIC_ARGUMENTS. - */ - -DUK_LOCAL void duk__create_arguments_object(duk_hthread *thr, - duk_hobject *func, - duk_hobject *varenv, - duk_idx_t idx_argbase, /* idx of first argument on stack */ - duk_idx_t num_stack_args) { /* num args starting from idx_argbase */ - duk_context *ctx = (duk_context *) thr; - duk_hobject *arg; /* 'arguments' */ - duk_hobject *formals; /* formals for 'func' (may be NULL if func is a C function) */ - duk_idx_t i_arg; - duk_idx_t i_map; - duk_idx_t i_mappednames; - duk_idx_t i_formals; - duk_idx_t i_argbase; - duk_idx_t n_formals; - duk_idx_t idx; - duk_bool_t need_map; - - DUK_DDD(DUK_DDDPRINT("creating arguments object for func=%!iO, varenv=%!iO, " - "idx_argbase=%ld, num_stack_args=%ld", - (duk_heaphdr *) func, (duk_heaphdr *) varenv, - (long) idx_argbase, (long) num_stack_args)); - - DUK_ASSERT(thr != NULL); - DUK_ASSERT(func != NULL); - DUK_ASSERT(DUK_HOBJECT_IS_NONBOUND_FUNCTION(func)); - DUK_ASSERT(varenv != NULL); - DUK_ASSERT(idx_argbase >= 0); /* assumed to bottom relative */ - DUK_ASSERT(num_stack_args >= 0); - - need_map = 0; - - i_argbase = idx_argbase; - DUK_ASSERT(i_argbase >= 0); - - duk_push_hobject(ctx, func); - duk_get_prop_stridx(ctx, -1, DUK_STRIDX_INT_FORMALS); - formals = duk_get_hobject(ctx, -1); - n_formals = 0; - if (formals) { - duk_get_prop_stridx(ctx, -1, DUK_STRIDX_LENGTH); - n_formals = (duk_idx_t) duk_require_int(ctx, -1); - duk_pop(ctx); - } - duk_remove(ctx, -2); /* leave formals on stack for later use */ - i_formals = duk_require_top_index(ctx); - - DUK_ASSERT(n_formals >= 0); - DUK_ASSERT(formals != NULL || n_formals == 0); - - DUK_DDD(DUK_DDDPRINT("func=%!O, formals=%!O, n_formals=%ld", - (duk_heaphdr *) func, (duk_heaphdr *) formals, - (long) n_formals)); - - /* [ ... formals ] */ - - /* - * Create required objects: - * - 'arguments' object: array-like, but not an array - * - 'map' object: internal object, tied to 'arguments' - * - 'mappedNames' object: temporary value used during construction - */ - - i_arg = duk_push_object_helper(ctx, - DUK_HOBJECT_FLAG_EXTENSIBLE | - DUK_HOBJECT_FLAG_ARRAY_PART | - DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_ARGUMENTS), - DUK_BIDX_OBJECT_PROTOTYPE); - DUK_ASSERT(i_arg >= 0); - arg = duk_require_hobject(ctx, -1); - DUK_ASSERT(arg != NULL); - - i_map = duk_push_object_helper(ctx, - DUK_HOBJECT_FLAG_EXTENSIBLE | - DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_OBJECT), - -1); /* no prototype */ - DUK_ASSERT(i_map >= 0); - - i_mappednames = duk_push_object_helper(ctx, - DUK_HOBJECT_FLAG_EXTENSIBLE | - DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_OBJECT), - -1); /* no prototype */ - DUK_ASSERT(i_mappednames >= 0); - - /* [ ... formals arguments map mappedNames ] */ - - DUK_DDD(DUK_DDDPRINT("created arguments related objects: " - "arguments at index %ld -> %!O " - "map at index %ld -> %!O " - "mappednames at index %ld -> %!O", - (long) i_arg, (duk_heaphdr *) duk_get_hobject(ctx, i_arg), - (long) i_map, (duk_heaphdr *) duk_get_hobject(ctx, i_map), - (long) i_mappednames, (duk_heaphdr *) duk_get_hobject(ctx, i_mappednames))); - - /* - * Init arguments properties, map, etc. - */ - - duk_push_int(ctx, num_stack_args); - duk_xdef_prop_stridx(ctx, i_arg, DUK_STRIDX_LENGTH, DUK_PROPDESC_FLAGS_WC); - - /* - * Init argument related properties - */ - - /* step 11 */ - idx = num_stack_args - 1; - while (idx >= 0) { - DUK_DDD(DUK_DDDPRINT("arg idx %ld, argbase=%ld, argidx=%ld", - (long) idx, (long) i_argbase, (long) (i_argbase + idx))); - - DUK_DDD(DUK_DDDPRINT("define arguments[%ld]=arg", (long) idx)); - duk_dup(ctx, i_argbase + idx); - duk_xdef_prop_index_wec(ctx, i_arg, (duk_uarridx_t) idx); - DUK_DDD(DUK_DDDPRINT("defined arguments[%ld]=arg", (long) idx)); - - /* step 11.c is relevant only if non-strict (checked in 11.c.ii) */ - if (!DUK_HOBJECT_HAS_STRICT(func) && idx < n_formals) { - DUK_ASSERT(formals != NULL); - - DUK_DDD(DUK_DDDPRINT("strict function, index within formals (%ld < %ld)", - (long) idx, (long) n_formals)); - - duk_get_prop_index(ctx, i_formals, idx); - DUK_ASSERT(duk_is_string(ctx, -1)); - - duk_dup(ctx, -1); /* [ ... name name ] */ - - if (!duk_has_prop(ctx, i_mappednames)) { - /* steps 11.c.ii.1 - 11.c.ii.4, but our internal book-keeping - * differs from the reference model - */ - - /* [ ... name ] */ - - need_map = 1; - - DUK_DDD(DUK_DDDPRINT("set mappednames[%s]=%ld", - (const char *) duk_get_string(ctx, -1), - (long) idx)); - duk_dup(ctx, -1); /* name */ - duk_push_uint(ctx, (duk_uint_t) idx); /* index */ - duk_to_string(ctx, -1); - duk_xdef_prop_wec(ctx, i_mappednames); /* out of spec, must be configurable */ - - DUK_DDD(DUK_DDDPRINT("set map[%ld]=%s", - (long) idx, - duk_get_string(ctx, -1))); - duk_dup(ctx, -1); /* name */ - duk_xdef_prop_index_wec(ctx, i_map, (duk_uarridx_t) idx); /* out of spec, must be configurable */ - } else { - /* duk_has_prop() popped the second 'name' */ - } - - /* [ ... name ] */ - duk_pop(ctx); /* pop 'name' */ - } - - idx--; - } - - DUK_DDD(DUK_DDDPRINT("actual arguments processed")); - - /* step 12 */ - if (need_map) { - DUK_DDD(DUK_DDDPRINT("adding 'map' and 'varenv' to arguments object")); - - /* should never happen for a strict callee */ - DUK_ASSERT(!DUK_HOBJECT_HAS_STRICT(func)); - - duk_dup(ctx, i_map); - duk_xdef_prop_stridx(ctx, i_arg, DUK_STRIDX_INT_MAP, DUK_PROPDESC_FLAGS_NONE); /* out of spec, don't care */ - - /* The variable environment for magic variable bindings needs to be - * given by the caller and recorded in the arguments object. - * - * See E5 Section 10.6, the creation of setters/getters. - * - * The variable environment also provides access to the callee, so - * an explicit (internal) callee property is not needed. - */ - - duk_push_hobject(ctx, varenv); - duk_xdef_prop_stridx(ctx, i_arg, DUK_STRIDX_INT_VARENV, DUK_PROPDESC_FLAGS_NONE); /* out of spec, don't care */ - } - - /* steps 13-14 */ - if (DUK_HOBJECT_HAS_STRICT(func)) { - /* Callee/caller are throwers and are not deletable etc. They - * could be implemented as virtual properties, but currently - * there is no support for virtual properties which are accessors - * (only plain virtual properties). This would not be difficult - * to change in duk_hobject_props, but we can make the throwers - * normal, concrete properties just as easily. - * - * Note that the specification requires that the *same* thrower - * built-in object is used here! See E5 Section 10.6 main - * algoritm, step 14, and Section 13.2.3 which describes the - * thrower. See test case test-arguments-throwers.js. - */ - - DUK_DDD(DUK_DDDPRINT("strict function, setting caller/callee to throwers")); - - duk_xdef_prop_stridx_thrower(ctx, i_arg, DUK_STRIDX_CALLER, DUK_PROPDESC_FLAGS_NONE); - duk_xdef_prop_stridx_thrower(ctx, i_arg, DUK_STRIDX_CALLEE, DUK_PROPDESC_FLAGS_NONE); - } else { - DUK_DDD(DUK_DDDPRINT("non-strict function, setting callee to actual value")); - duk_push_hobject(ctx, func); - duk_xdef_prop_stridx(ctx, i_arg, DUK_STRIDX_CALLEE, DUK_PROPDESC_FLAGS_WC); - } - - /* set exotic behavior only after we're done */ - if (need_map) { - /* Exotic behaviors are only enabled for arguments objects - * which have a parameter map (see E5 Section 10.6 main - * algorithm, step 12). - * - * In particular, a non-strict arguments object with no - * mapped formals does *NOT* get exotic behavior, even - * for e.g. "caller" property. This seems counterintuitive - * but seems to be the case. - */ - - /* cannot be strict (never mapped variables) */ - DUK_ASSERT(!DUK_HOBJECT_HAS_STRICT(func)); - - DUK_DDD(DUK_DDDPRINT("enabling exotic behavior for arguments object")); - DUK_HOBJECT_SET_EXOTIC_ARGUMENTS(arg); - } else { - DUK_DDD(DUK_DDDPRINT("not enabling exotic behavior for arguments object")); - } - - DUK_DDD(DUK_DDDPRINT("final arguments related objects: " - "arguments at index %ld -> %!O " - "map at index %ld -> %!O " - "mappednames at index %ld -> %!O", - (long) i_arg, (duk_heaphdr *) duk_get_hobject(ctx, i_arg), - (long) i_map, (duk_heaphdr *) duk_get_hobject(ctx, i_map), - (long) i_mappednames, (duk_heaphdr *) duk_get_hobject(ctx, i_mappednames))); - - /* [ args(n) [crud] formals arguments map mappednames ] */ - - duk_pop_2(ctx); - duk_remove(ctx, -2); - - /* [ args [crud] arguments ] */ -} - -/* Helper for creating the arguments object and adding it to the env record - * on top of the value stack. This helper has a very strict dependency on - * the shape of the input stack. - */ -DUK_LOCAL void duk__handle_createargs_for_call(duk_hthread *thr, - duk_hobject *func, - duk_hobject *env, - duk_idx_t num_stack_args) { - duk_context *ctx = (duk_context *) thr; - - DUK_DDD(DUK_DDDPRINT("creating arguments object for function call")); - - DUK_ASSERT(thr != NULL); - DUK_ASSERT(func != NULL); - DUK_ASSERT(env != NULL); - DUK_ASSERT(DUK_HOBJECT_HAS_CREATEARGS(func)); - DUK_ASSERT(duk_get_top(ctx) >= num_stack_args + 1); - - /* [ ... arg1 ... argN envobj ] */ - - duk__create_arguments_object(thr, - func, - env, - duk_get_top(ctx) - num_stack_args - 1, /* idx_argbase */ - num_stack_args); - - /* [ ... arg1 ... argN envobj argobj ] */ - - duk_xdef_prop_stridx(ctx, - -2, - DUK_STRIDX_LC_ARGUMENTS, - DUK_HOBJECT_HAS_STRICT(func) ? DUK_PROPDESC_FLAGS_E : /* strict: non-deletable, non-writable */ - DUK_PROPDESC_FLAGS_WE); /* non-strict: non-deletable, writable */ - /* [ ... arg1 ... argN envobj ] */ -} - -/* - * Helper for handling a "bound function" chain when a call is being made. - * - * Follows the bound function chain until a non-bound function is found. - * Prepends the bound arguments to the value stack (at idx_func + 2), - * updating 'num_stack_args' in the process. The 'this' binding is also - * updated if necessary (at idx_func + 1). Note that for constructor calls - * the 'this' binding is never updated by [[BoundThis]]. - * - * XXX: bound function chains could be collapsed at bound function creation - * time so that each bound function would point directly to a non-bound - * function. This would make call time handling much easier. - */ - -DUK_LOCAL void duk__handle_bound_chain_for_call(duk_hthread *thr, - duk_idx_t idx_func, - duk_idx_t *p_num_stack_args, /* may be changed by call */ - duk_bool_t is_constructor_call) { - duk_context *ctx = (duk_context *) thr; - duk_idx_t num_stack_args; - duk_tval *tv_func; - duk_hobject *func; - duk_uint_t sanity; - - DUK_ASSERT(thr != NULL); - DUK_ASSERT(p_num_stack_args != NULL); - - /* On entry, item at idx_func is a bound, non-lightweight function, - * but we don't rely on that below. - */ - - num_stack_args = *p_num_stack_args; - - sanity = DUK_HOBJECT_BOUND_CHAIN_SANITY; - do { - duk_idx_t i, len; - - tv_func = duk_require_tval(ctx, idx_func); - DUK_ASSERT(tv_func != NULL); - - if (DUK_TVAL_IS_LIGHTFUNC(tv_func)) { - /* Lightweight function: never bound, so terminate. */ - break; - } else if (DUK_TVAL_IS_OBJECT(tv_func)) { - func = DUK_TVAL_GET_OBJECT(tv_func); - if (!DUK_HOBJECT_HAS_BOUND(func)) { - /* Normal non-bound function. */ - break; - } - } else { - /* Function.prototype.bind() should never let this happen, - * ugly error message is enough. - */ - DUK_ERROR_INTERNAL_DEFMSG(thr); - } - DUK_ASSERT(DUK_TVAL_GET_OBJECT(tv_func) != NULL); - - /* XXX: this could be more compact by accessing the internal properties - * directly as own properties (they cannot be inherited, and are not - * externally visible). - */ - - DUK_DDD(DUK_DDDPRINT("bound function encountered, ptr=%p, num_stack_args=%ld: %!T", - (void *) DUK_TVAL_GET_OBJECT(tv_func), (long) num_stack_args, tv_func)); - - /* [ ... func this arg1 ... argN ] */ - - if (is_constructor_call) { - /* See: tests/ecmascript/test-spec-bound-constructor.js */ - DUK_DDD(DUK_DDDPRINT("constructor call: don't update this binding")); - } else { - duk_get_prop_stridx(ctx, idx_func, DUK_STRIDX_INT_THIS); - duk_replace(ctx, idx_func + 1); /* idx_this = idx_func + 1 */ - } - - /* [ ... func this arg1 ... argN ] */ - - /* XXX: duk_get_length? */ - duk_get_prop_stridx(ctx, idx_func, DUK_STRIDX_INT_ARGS); /* -> [ ... func this arg1 ... argN _Args ] */ - duk_get_prop_stridx(ctx, -1, DUK_STRIDX_LENGTH); /* -> [ ... func this arg1 ... argN _Args length ] */ - len = (duk_idx_t) duk_require_int(ctx, -1); - duk_pop(ctx); - for (i = 0; i < len; i++) { - /* XXX: very slow - better to bulk allocate a gap, and copy - * from args_array directly (we know it has a compact array - * part, etc). - */ - - /* [ ... func this <some bound args> arg1 ... argN _Args ] */ - duk_get_prop_index(ctx, -1, i); - duk_insert(ctx, idx_func + 2 + i); /* idx_args = idx_func + 2 */ - } - num_stack_args += len; /* must be updated to work properly (e.g. creation of 'arguments') */ - duk_pop(ctx); - - /* [ ... func this <bound args> arg1 ... argN ] */ - - duk_get_prop_stridx(ctx, idx_func, DUK_STRIDX_INT_TARGET); - duk_replace(ctx, idx_func); /* replace in stack */ - - DUK_DDD(DUK_DDDPRINT("bound function handled, num_stack_args=%ld, idx_func=%ld, curr func=%!T", - (long) num_stack_args, (long) idx_func, duk_get_tval(ctx, idx_func))); - } while (--sanity > 0); - - if (sanity == 0) { - DUK_ERROR_RANGE(thr, DUK_STR_BOUND_CHAIN_LIMIT); - } - - DUK_DDD(DUK_DDDPRINT("final non-bound function is: %!T", duk_get_tval(ctx, idx_func))); - -#if defined(DUK_USE_ASSERTIONS) - tv_func = duk_require_tval(ctx, idx_func); - DUK_ASSERT(DUK_TVAL_IS_LIGHTFUNC(tv_func) || DUK_TVAL_IS_OBJECT(tv_func)); - if (DUK_TVAL_IS_OBJECT(tv_func)) { - func = DUK_TVAL_GET_OBJECT(tv_func); - DUK_ASSERT(func != NULL); - DUK_ASSERT(!DUK_HOBJECT_HAS_BOUND(func)); - DUK_ASSERT(DUK_HOBJECT_HAS_COMPILEDFUNCTION(func) || - DUK_HOBJECT_HAS_NATIVEFUNCTION(func)); - } -#endif - - /* write back */ - *p_num_stack_args = num_stack_args; -} - -/* - * Helper for setting up var_env and lex_env of an activation, - * assuming it does NOT have the DUK_HOBJECT_FLAG_NEWENV flag. - */ - -DUK_LOCAL void duk__handle_oldenv_for_call(duk_hthread *thr, - duk_hobject *func, - duk_activation *act) { - duk_tval *tv; - - DUK_ASSERT(thr != NULL); - DUK_ASSERT(func != NULL); - DUK_ASSERT(act != NULL); - DUK_ASSERT(!DUK_HOBJECT_HAS_NEWENV(func)); - DUK_ASSERT(!DUK_HOBJECT_HAS_CREATEARGS(func)); - - tv = duk_hobject_find_existing_entry_tval_ptr(thr->heap, func, DUK_HTHREAD_STRING_INT_LEXENV(thr)); - if (tv) { - DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv)); - DUK_ASSERT(DUK_HOBJECT_IS_ENV(DUK_TVAL_GET_OBJECT(tv))); - act->lex_env = DUK_TVAL_GET_OBJECT(tv); - - tv = duk_hobject_find_existing_entry_tval_ptr(thr->heap, func, DUK_HTHREAD_STRING_INT_VARENV(thr)); - if (tv) { - DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv)); - DUK_ASSERT(DUK_HOBJECT_IS_ENV(DUK_TVAL_GET_OBJECT(tv))); - act->var_env = DUK_TVAL_GET_OBJECT(tv); - } else { - act->var_env = act->lex_env; - } - } else { - act->lex_env = thr->builtins[DUK_BIDX_GLOBAL_ENV]; - act->var_env = act->lex_env; - } - - DUK_HOBJECT_INCREF_ALLOWNULL(thr, act->lex_env); - DUK_HOBJECT_INCREF_ALLOWNULL(thr, act->var_env); -} - -/* - * Helper for updating callee 'caller' property. - */ - -#if defined(DUK_USE_NONSTD_FUNC_CALLER_PROPERTY) -DUK_LOCAL void duk__update_func_caller_prop(duk_hthread *thr, duk_hobject *func) { - duk_tval *tv_caller; - duk_hobject *h_tmp; - duk_activation *act_callee; - duk_activation *act_caller; - - DUK_ASSERT(thr != NULL); - DUK_ASSERT(func != NULL); - DUK_ASSERT(!DUK_HOBJECT_HAS_BOUND(func)); /* bound chain resolved */ - DUK_ASSERT(thr->callstack_top >= 1); - - if (DUK_HOBJECT_HAS_STRICT(func)) { - /* Strict functions don't get their 'caller' updated. */ - return; - } - - act_callee = thr->callstack + thr->callstack_top - 1; - act_caller = (thr->callstack_top >= 2 ? act_callee - 1 : NULL); - - /* XXX: check .caller writability? */ - - /* Backup 'caller' property and update its value. */ - tv_caller = duk_hobject_find_existing_entry_tval_ptr(thr->heap, func, DUK_HTHREAD_STRING_CALLER(thr)); - if (tv_caller) { - /* If caller is global/eval code, 'caller' should be set to - * 'null'. - * - * XXX: there is no exotic flag to infer this correctly now. - * The NEWENV flag is used now which works as intended for - * everything (global code, non-strict eval code, and functions) - * except strict eval code. Bound functions are never an issue - * because 'func' has been resolved to a non-bound function. - */ - - if (act_caller) { - /* act_caller->func may be NULL in some finalization cases, - * just treat like we don't know the caller. - */ - if (act_caller->func && !DUK_HOBJECT_HAS_NEWENV(act_caller->func)) { - /* Setting to NULL causes 'caller' to be set to - * 'null' as desired. - */ - act_caller = NULL; - } - } - - if (DUK_TVAL_IS_OBJECT(tv_caller)) { - h_tmp = DUK_TVAL_GET_OBJECT(tv_caller); - DUK_ASSERT(h_tmp != NULL); - act_callee->prev_caller = h_tmp; - - /* Previous value doesn't need refcount changes because its ownership - * is transferred to prev_caller. - */ - - if (act_caller) { - DUK_ASSERT(act_caller->func != NULL); - DUK_TVAL_SET_OBJECT(tv_caller, act_caller->func); - DUK_TVAL_INCREF(thr, tv_caller); - } else { - DUK_TVAL_SET_NULL(tv_caller); /* no incref */ - } - } else { - /* 'caller' must only take on 'null' or function value */ - DUK_ASSERT(!DUK_TVAL_IS_HEAP_ALLOCATED(tv_caller)); - DUK_ASSERT(act_callee->prev_caller == NULL); - if (act_caller && act_caller->func) { - /* Tolerate act_caller->func == NULL which happens in - * some finalization cases; treat like unknown caller. - */ - DUK_TVAL_SET_OBJECT(tv_caller, act_caller->func); - DUK_TVAL_INCREF(thr, tv_caller); - } else { - DUK_TVAL_SET_NULL(tv_caller); /* no incref */ - } - } - } -} -#endif /* DUK_USE_NONSTD_FUNC_CALLER_PROPERTY */ - -/* - * Determine the effective 'this' binding and coerce the current value - * on the valstack to the effective one (in-place, at idx_this). - * - * The current this value in the valstack (at idx_this) represents either: - * - the caller's requested 'this' binding; or - * - a 'this' binding accumulated from the bound function chain - * - * The final 'this' binding for the target function may still be - * different, and is determined as described in E5 Section 10.4.3. - * - * For global and eval code (E5 Sections 10.4.1 and 10.4.2), we assume - * that the caller has provided the correct 'this' binding explicitly - * when calling, i.e.: - * - * - global code: this=global object - * - direct eval: this=copy from eval() caller's this binding - * - other eval: this=global object - * - * Note: this function may cause a recursive function call with arbitrary - * side effects, because ToObject() may be called. - */ - -DUK_LOCAL void duk__coerce_effective_this_binding(duk_hthread *thr, - duk_hobject *func, - duk_idx_t idx_this) { - duk_context *ctx = (duk_context *) thr; - duk_tval *tv_this; - duk_hobject *obj_global; - - if (func == NULL || DUK_HOBJECT_HAS_STRICT(func)) { - /* Lightfuncs are always considered strict. */ - DUK_DDD(DUK_DDDPRINT("this binding: strict -> use directly")); - return; - } - - /* XXX: byte offset */ - tv_this = thr->valstack_bottom + idx_this; - switch (DUK_TVAL_GET_TAG(tv_this)) { - case DUK_TAG_OBJECT: - case DUK_TAG_LIGHTFUNC: /* lightfuncs are treated like objects and not coerced */ - DUK_DDD(DUK_DDDPRINT("this binding: non-strict, object -> use directly")); - break; - case DUK_TAG_UNDEFINED: - case DUK_TAG_NULL: - DUK_DDD(DUK_DDDPRINT("this binding: non-strict, undefined/null -> use global object")); - obj_global = thr->builtins[DUK_BIDX_GLOBAL]; - /* XXX: avoid this check somehow */ - if (DUK_LIKELY(obj_global != NULL)) { - DUK_ASSERT(!DUK_TVAL_IS_HEAP_ALLOCATED(tv_this)); /* no need to decref previous value */ - DUK_TVAL_SET_OBJECT(tv_this, obj_global); - DUK_HOBJECT_INCREF(thr, obj_global); - } else { - /* This may only happen if built-ins are being "torn down". - * This behavior is out of specification scope. - */ - DUK_D(DUK_DPRINT("this binding: wanted to use global object, but it is NULL -> using undefined instead")); - DUK_ASSERT(!DUK_TVAL_IS_HEAP_ALLOCATED(tv_this)); /* no need to decref previous value */ - DUK_TVAL_SET_UNDEFINED(tv_this); /* nothing to incref */ - } - break; - default: - DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv_this)); - DUK_DDD(DUK_DDDPRINT("this binding: non-strict, not object/undefined/null -> use ToObject(value)")); - duk_to_object(ctx, idx_this); /* may have side effects */ - break; - } -} - -/* - * Shared helper for non-bound func lookup. - * - * Returns duk_hobject * to the final non-bound function (NULL for lightfunc). - */ - -DUK_LOCAL duk_hobject *duk__nonbound_func_lookup(duk_context *ctx, - duk_idx_t idx_func, - duk_idx_t *out_num_stack_args, - duk_tval **out_tv_func, - duk_small_uint_t call_flags) { - duk_hthread *thr = (duk_hthread *) ctx; - duk_tval *tv_func; - duk_hobject *func; - - for (;;) { - /* Use loop to minimize code size of relookup after bound function case */ - tv_func = DUK_GET_TVAL_POSIDX(ctx, idx_func); - DUK_ASSERT(tv_func != NULL); - - if (DUK_TVAL_IS_OBJECT(tv_func)) { - func = DUK_TVAL_GET_OBJECT(tv_func); - if (!DUK_HOBJECT_IS_CALLABLE(func)) { - goto not_callable_error; - } - if (DUK_HOBJECT_HAS_BOUND(func)) { - duk__handle_bound_chain_for_call(thr, idx_func, out_num_stack_args, call_flags & DUK_CALL_FLAG_CONSTRUCTOR_CALL); - - /* The final object may be a normal function or a lightfunc. - * We need to re-lookup tv_func because it may have changed - * (also value stack may have been resized). Loop again to - * do that; we're guaranteed not to come here again. - */ - DUK_ASSERT(DUK_TVAL_IS_OBJECT(duk_require_tval(ctx, idx_func)) || - DUK_TVAL_IS_LIGHTFUNC(duk_require_tval(ctx, idx_func))); - continue; - } - } else if (DUK_TVAL_IS_LIGHTFUNC(tv_func)) { - func = NULL; - } else { - goto not_callable_error; - } - break; - } - - DUK_ASSERT((DUK_TVAL_IS_OBJECT(tv_func) && DUK_HOBJECT_IS_CALLABLE(DUK_TVAL_GET_OBJECT(tv_func))) || - DUK_TVAL_IS_LIGHTFUNC(tv_func)); - DUK_ASSERT(func == NULL || !DUK_HOBJECT_HAS_BOUND(func)); - DUK_ASSERT(func == NULL || (DUK_HOBJECT_IS_COMPILEDFUNCTION(func) || - DUK_HOBJECT_IS_NATIVEFUNCTION(func))); - - *out_tv_func = tv_func; - return func; - - not_callable_error: - DUK_ASSERT(tv_func != NULL); -#if defined(DUK_USE_PARANOID_ERRORS) - DUK_ERROR_TYPE(thr, DUK_STR_NOT_CALLABLE); -#else - DUK_ERROR_FMT1(thr, DUK_ERR_TYPE_ERROR, "%s not callable", duk_push_string_tval_readable(ctx, tv_func)); -#endif - DUK_UNREACHABLE(); - return NULL; /* never executed */ -} - -/* - * Value stack resize and stack top adjustment helper. - * - * XXX: This should all be merged to duk_valstack_resize_raw(). - */ - -DUK_LOCAL void duk__adjust_valstack_and_top(duk_hthread *thr, - duk_idx_t num_stack_args, - duk_idx_t idx_args, - duk_idx_t nregs, - duk_idx_t nargs, - duk_hobject *func) { - duk_context *ctx = (duk_context *) thr; - duk_size_t vs_min_size; - duk_bool_t adjusted_top = 0; - - vs_min_size = (thr->valstack_bottom - thr->valstack) + /* bottom of current func */ - idx_args; /* bottom of new func */ - - if (nregs >= 0) { - DUK_ASSERT(nargs >= 0); - DUK_ASSERT(nregs >= nargs); - vs_min_size += nregs; - } else { - /* 'func' wants stack "as is" */ - vs_min_size += num_stack_args; /* num entries of new func at entry */ - } - if (func == NULL || DUK_HOBJECT_IS_NATIVEFUNCTION(func)) { - vs_min_size += DUK_VALSTACK_API_ENTRY_MINIMUM; /* Duktape/C API guaranteed entries (on top of args) */ - } - vs_min_size += DUK_VALSTACK_INTERNAL_EXTRA; /* + spare */ - - /* XXX: We can't resize the value stack to a size smaller than the - * current top, so the order of the resize and adjusting the stack - * top depends on the current vs. final size of the value stack. - * The operations could be combined to avoid this, but the proper - * fix is to only grow the value stack on a function call, and only - * shrink it (without throwing if the shrink fails) on function - * return. - */ - - if (vs_min_size < (duk_size_t) (thr->valstack_top - thr->valstack)) { - DUK_DDD(DUK_DDDPRINT(("final size smaller, set top before resize"))); - - DUK_ASSERT(nregs >= 0); /* can't happen when keeping current stack size */ - duk_set_top(ctx, idx_args + nargs); /* clamp anything above nargs */ - duk_set_top(ctx, idx_args + nregs); /* extend with undefined */ - adjusted_top = 1; - } - - (void) duk_valstack_resize_raw((duk_context *) thr, - vs_min_size, - DUK_VSRESIZE_FLAG_SHRINK | /* flags */ - 0 /* no compact */ | - DUK_VSRESIZE_FLAG_THROW); - - if (!adjusted_top) { - if (nregs >= 0) { - DUK_ASSERT(nregs >= nargs); - duk_set_top(ctx, idx_args + nargs); /* clamp anything above nargs */ - duk_set_top(ctx, idx_args + nregs); /* extend with undefined */ - } - } -} - -/* - * Manipulate value stack so that exactly 'num_stack_rets' return - * values are at 'idx_retbase' in every case, assuming there are - * 'rc' return values on top of stack. - * - * This is a bit tricky, because the called C function operates in - * the same activation record and may have e.g. popped the stack - * empty (below idx_retbase). - */ - -DUK_LOCAL void duk__safe_call_adjust_valstack(duk_hthread *thr, duk_idx_t idx_retbase, duk_idx_t num_stack_rets, duk_idx_t num_actual_rets) { - duk_context *ctx = (duk_context *) thr; - duk_idx_t idx_rcbase; - - DUK_ASSERT(thr != NULL); - DUK_ASSERT(idx_retbase >= 0); - DUK_ASSERT(num_stack_rets >= 0); - DUK_ASSERT(num_actual_rets >= 0); - - idx_rcbase = duk_get_top(ctx) - num_actual_rets; /* base of known return values */ - - DUK_DDD(DUK_DDDPRINT("adjust valstack after func call: " - "num_stack_rets=%ld, num_actual_rets=%ld, stack_top=%ld, idx_retbase=%ld, idx_rcbase=%ld", - (long) num_stack_rets, (long) num_actual_rets, (long) duk_get_top(ctx), - (long) idx_retbase, (long) idx_rcbase)); - - DUK_ASSERT(idx_rcbase >= 0); /* caller must check */ - - /* Ensure space for final configuration (idx_retbase + num_stack_rets) - * and intermediate configurations. - */ - duk_require_stack_top(ctx, - (idx_rcbase > idx_retbase ? idx_rcbase : idx_retbase) + - num_stack_rets); - - /* Chop extra retvals away / extend with undefined. */ - duk_set_top(ctx, idx_rcbase + num_stack_rets); - - if (idx_rcbase >= idx_retbase) { - duk_idx_t count = idx_rcbase - idx_retbase; - duk_idx_t i; - - DUK_DDD(DUK_DDDPRINT("elements at/after idx_retbase have enough to cover func retvals " - "(idx_retbase=%ld, idx_rcbase=%ld)", (long) idx_retbase, (long) idx_rcbase)); - - /* nuke values at idx_retbase to get the first retval (initially - * at idx_rcbase) to idx_retbase - */ - - DUK_ASSERT(count >= 0); - - for (i = 0; i < count; i++) { - /* XXX: inefficient; block remove primitive */ - duk_remove(ctx, idx_retbase); - } - } else { - duk_idx_t count = idx_retbase - idx_rcbase; - duk_idx_t i; - - DUK_DDD(DUK_DDDPRINT("not enough elements at/after idx_retbase to cover func retvals " - "(idx_retbase=%ld, idx_rcbase=%ld)", (long) idx_retbase, (long) idx_rcbase)); - - /* insert 'undefined' values at idx_rcbase to get the - * return values to idx_retbase - */ - - DUK_ASSERT(count > 0); - - for (i = 0; i < count; i++) { - /* XXX: inefficient; block insert primitive */ - duk_push_undefined(ctx); - duk_insert(ctx, idx_rcbase); - } - } -} - -/* - * Misc shared helpers. - */ - -/* Get valstack index for the func argument or throw if insane stack. */ -DUK_LOCAL duk_idx_t duk__get_idx_func(duk_hthread *thr, duk_idx_t num_stack_args) { - duk_size_t off_stack_top; - duk_size_t off_stack_args; - duk_size_t off_stack_all; - duk_idx_t idx_func; /* valstack index of 'func' and retval (relative to entry valstack_bottom) */ - - /* Argument validation and func/args offset. */ - off_stack_top = (duk_size_t) ((duk_uint8_t *) thr->valstack_top - (duk_uint8_t *) thr->valstack_bottom); - off_stack_args = (duk_size_t) ((duk_size_t) num_stack_args * sizeof(duk_tval)); - off_stack_all = off_stack_args + 2 * sizeof(duk_tval); - if (DUK_UNLIKELY(off_stack_all > off_stack_top)) { - /* Since stack indices are not reliable, we can't do anything useful - * here. Invoke the existing setjmp catcher, or if it doesn't exist, - * call the fatal error handler. - */ - DUK_ERROR_API(thr, DUK_STR_INVALID_CALL_ARGS); - return 0; - } - idx_func = (duk_idx_t) ((off_stack_top - off_stack_all) / sizeof(duk_tval)); - return idx_func; -} - -/* - * duk_handle_call_protected() and duk_handle_call_unprotected(): - * call into a Duktape/C or an Ecmascript function from any state. - * - * Input stack (thr): - * - * [ func this arg1 ... argN ] - * - * Output stack (thr): - * - * [ retval ] (DUK_EXEC_SUCCESS) - * [ errobj ] (DUK_EXEC_ERROR (normal error), protected call) - * - * Even when executing a protected call an error may be thrown in rare cases - * such as an insane num_stack_args argument. If there is no catchpoint for - * such errors, the fatal error handler is called. - * - * The error handling path should be error free, even for out-of-memory - * errors, to ensure safe sandboxing. (As of Duktape 1.4.0 this is not - * yet the case, see XXX notes below.) - */ - -DUK_INTERNAL duk_int_t duk_handle_call_protected(duk_hthread *thr, - duk_idx_t num_stack_args, - duk_small_uint_t call_flags) { - duk_context *ctx; - duk_size_t entry_valstack_bottom_index; - duk_size_t entry_valstack_end; - duk_size_t entry_callstack_top; - duk_size_t entry_catchstack_top; - duk_int_t entry_call_recursion_depth; - duk_hthread *entry_curr_thread; - duk_uint_fast8_t entry_thread_state; - duk_instr_t **entry_ptr_curr_pc; - duk_jmpbuf *old_jmpbuf_ptr = NULL; - duk_jmpbuf our_jmpbuf; - duk_idx_t idx_func; /* valstack index of 'func' and retval (relative to entry valstack_bottom) */ - - /* XXX: Multiple tv_func lookups are now avoided by making a local - * copy of tv_func. Another approach would be to compute an offset - * for tv_func from valstack bottom and recomputing the tv_func - * pointer quickly as valstack + offset instead of calling duk_get_tval(). - */ - - ctx = (duk_context *) thr; - DUK_UNREF(ctx); - DUK_ASSERT(thr != NULL); - DUK_ASSERT_CTX_VALID(ctx); - DUK_ASSERT(num_stack_args >= 0); - /* XXX: currently NULL allocations are not supported; remove if later allowed */ - DUK_ASSERT(thr->valstack != NULL); - DUK_ASSERT(thr->callstack != NULL); - DUK_ASSERT(thr->catchstack != NULL); - - /* Argument validation and func/args offset. */ - idx_func = duk__get_idx_func(thr, num_stack_args); - - /* Preliminaries, required by setjmp() handler. Must be careful not - * to throw an unintended error here. - */ - - entry_valstack_bottom_index = (duk_size_t) (thr->valstack_bottom - thr->valstack); -#if defined(DUK_USE_PREFER_SIZE) - entry_valstack_end = (duk_size_t) (thr->valstack_end - thr->valstack); -#else - DUK_ASSERT((duk_size_t) (thr->valstack_end - thr->valstack) == thr->valstack_size); - entry_valstack_end = thr->valstack_size; -#endif - entry_callstack_top = thr->callstack_top; - entry_catchstack_top = thr->catchstack_top; - entry_call_recursion_depth = thr->heap->call_recursion_depth; - entry_curr_thread = thr->heap->curr_thread; /* Note: may be NULL if first call */ - entry_thread_state = thr->state; - entry_ptr_curr_pc = thr->ptr_curr_pc; /* may be NULL */ - - DUK_DD(DUK_DDPRINT("duk_handle_call_protected: thr=%p, num_stack_args=%ld, " - "call_flags=0x%08lx (ignorerec=%ld, constructor=%ld), " - "valstack_top=%ld, idx_func=%ld, idx_args=%ld, rec_depth=%ld/%ld, " - "entry_valstack_bottom_index=%ld, entry_callstack_top=%ld, entry_catchstack_top=%ld, " - "entry_call_recursion_depth=%ld, entry_curr_thread=%p, entry_thread_state=%ld", - (void *) thr, - (long) num_stack_args, - (unsigned long) call_flags, - (long) ((call_flags & DUK_CALL_FLAG_IGNORE_RECLIMIT) != 0 ? 1 : 0), - (long) ((call_flags & DUK_CALL_FLAG_CONSTRUCTOR_CALL) != 0 ? 1 : 0), - (long) duk_get_top(ctx), - (long) idx_func, - (long) (idx_func + 2), - (long) thr->heap->call_recursion_depth, - (long) thr->heap->call_recursion_limit, - (long) entry_valstack_bottom_index, - (long) entry_callstack_top, - (long) entry_catchstack_top, - (long) entry_call_recursion_depth, - (void *) entry_curr_thread, - (long) entry_thread_state)); - - old_jmpbuf_ptr = thr->heap->lj.jmpbuf_ptr; - thr->heap->lj.jmpbuf_ptr = &our_jmpbuf; - -#if defined(DUK_USE_CPP_EXCEPTIONS) - try { -#else - DUK_ASSERT(thr->heap->lj.jmpbuf_ptr == &our_jmpbuf); - if (DUK_SETJMP(our_jmpbuf.jb) == 0) { -#endif - /* Call handling and success path. Success path exit cleans - * up almost all state. - */ - duk__handle_call_inner(thr, num_stack_args, call_flags, idx_func); - - /* Success path handles */ - DUK_ASSERT(thr->heap->call_recursion_depth == entry_call_recursion_depth); - DUK_ASSERT(thr->ptr_curr_pc == entry_ptr_curr_pc); - - /* Longjmp state is kept clean in success path */ - DUK_ASSERT(thr->heap->lj.type == DUK_LJ_TYPE_UNKNOWN); - DUK_ASSERT(thr->heap->lj.iserror == 0); - DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(&thr->heap->lj.value1)); - DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(&thr->heap->lj.value2)); - - thr->heap->lj.jmpbuf_ptr = old_jmpbuf_ptr; - - return DUK_EXEC_SUCCESS; -#if defined(DUK_USE_CPP_EXCEPTIONS) - } catch (duk_internal_exception &exc) { -#else - } else { -#endif - /* Error; error value is in heap->lj.value1. */ - -#if defined(DUK_USE_CPP_EXCEPTIONS) - DUK_UNREF(exc); -#endif - - duk__handle_call_error(thr, - entry_valstack_bottom_index, - entry_valstack_end, - entry_catchstack_top, - entry_callstack_top, - entry_call_recursion_depth, - entry_curr_thread, - entry_thread_state, - entry_ptr_curr_pc, - idx_func, - old_jmpbuf_ptr); - - /* Longjmp state is cleaned up by error handling */ - DUK_ASSERT(thr->heap->lj.type == DUK_LJ_TYPE_UNKNOWN); - DUK_ASSERT(thr->heap->lj.iserror == 0); - DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(&thr->heap->lj.value1)); - DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(&thr->heap->lj.value2)); - return DUK_EXEC_ERROR; - } -#if defined(DUK_USE_CPP_EXCEPTIONS) - catch (std::exception &exc) { - const char *what = exc.what(); - if (!what) { - what = "unknown"; - } - DUK_D(DUK_DPRINT("unexpected c++ std::exception (perhaps thrown by user code)")); - try { - DUK_ERROR_FMT1(thr, DUK_ERR_API_ERROR, "caught invalid c++ std::exception '%s' (perhaps thrown by user code)", what); - } catch (duk_internal_exception exc) { - DUK_D(DUK_DPRINT("caught api error thrown from unexpected c++ std::exception")); - DUK_UNREF(exc); - duk__handle_call_error(thr, - entry_valstack_bottom_index, - entry_valstack_end, - entry_catchstack_top, - entry_callstack_top, - entry_call_recursion_depth, - entry_curr_thread, - entry_thread_state, - entry_ptr_curr_pc, - idx_func, - old_jmpbuf_ptr); - return DUK_EXEC_ERROR; - } - } catch (...) { - DUK_D(DUK_DPRINT("unexpected c++ exception (perhaps thrown by user code)")); - try { - DUK_ERROR_API(thr, "caught invalid c++ exception (perhaps thrown by user code)"); - } catch (duk_internal_exception exc) { - DUK_D(DUK_DPRINT("caught api error thrown from unexpected c++ exception")); - DUK_UNREF(exc); - duk__handle_call_error(thr, - entry_valstack_bottom_index, - entry_valstack_end, - entry_catchstack_top, - entry_callstack_top, - entry_call_recursion_depth, - entry_curr_thread, - entry_thread_state, - entry_ptr_curr_pc, - idx_func, - old_jmpbuf_ptr); - return DUK_EXEC_ERROR; - } - } -#endif -} - -DUK_INTERNAL void duk_handle_call_unprotected(duk_hthread *thr, - duk_idx_t num_stack_args, - duk_small_uint_t call_flags) { - duk_idx_t idx_func; /* valstack index of 'func' and retval (relative to entry valstack_bottom) */ - - /* Argument validation and func/args offset. */ - idx_func = duk__get_idx_func(thr, num_stack_args); - - duk__handle_call_inner(thr, num_stack_args, call_flags, idx_func); -} - -DUK_LOCAL void duk__handle_call_inner(duk_hthread *thr, - duk_idx_t num_stack_args, - duk_small_uint_t call_flags, - duk_idx_t idx_func) { - duk_context *ctx; - duk_size_t entry_valstack_bottom_index; - duk_size_t entry_valstack_end; - duk_size_t entry_callstack_top; - duk_size_t entry_catchstack_top; - duk_int_t entry_call_recursion_depth; - duk_hthread *entry_curr_thread; - duk_uint_fast8_t entry_thread_state; - duk_instr_t **entry_ptr_curr_pc; - duk_idx_t nargs; /* # argument registers target function wants (< 0 => "as is") */ - duk_idx_t nregs; /* # total registers target function wants on entry (< 0 => "as is") */ - duk_hobject *func; /* 'func' on stack (borrowed reference) */ - duk_tval *tv_func; /* duk_tval ptr for 'func' on stack (borrowed reference) or tv_func_copy */ - duk_tval tv_func_copy; /* to avoid relookups */ - duk_activation *act; - duk_hobject *env; - duk_ret_t rc; - - ctx = (duk_context *) thr; - DUK_ASSERT(thr != NULL); - DUK_ASSERT_CTX_VALID(ctx); - DUK_ASSERT(ctx != NULL); - DUK_ASSERT(num_stack_args >= 0); - /* XXX: currently NULL allocations are not supported; remove if later allowed */ - DUK_ASSERT(thr->valstack != NULL); - DUK_ASSERT(thr->callstack != NULL); - DUK_ASSERT(thr->catchstack != NULL); - - DUK_DD(DUK_DDPRINT("duk__handle_call_inner: num_stack_args=%ld, call_flags=0x%08lx, top=%ld", - (long) num_stack_args, (long) call_flags, (long) duk_get_top(ctx))); - - /* - * Store entry state. - */ - - entry_valstack_bottom_index = (duk_size_t) (thr->valstack_bottom - thr->valstack); -#if defined(DUK_USE_PREFER_SIZE) - entry_valstack_end = (duk_size_t) (thr->valstack_end - thr->valstack); -#else - DUK_ASSERT((duk_size_t) (thr->valstack_end - thr->valstack) == thr->valstack_size); - entry_valstack_end = thr->valstack_size; -#endif - entry_callstack_top = thr->callstack_top; - entry_catchstack_top = thr->catchstack_top; - entry_call_recursion_depth = thr->heap->call_recursion_depth; - entry_curr_thread = thr->heap->curr_thread; /* Note: may be NULL if first call */ - entry_thread_state = thr->state; - entry_ptr_curr_pc = thr->ptr_curr_pc; /* may be NULL */ - - /* If thr->ptr_curr_pc is set, sync curr_pc to act->pc. Then NULL - * thr->ptr_curr_pc so that it's not accidentally used with an incorrect - * activation when side effects occur. - */ - duk_hthread_sync_and_null_currpc(thr); - - DUK_DD(DUK_DDPRINT("duk__handle_call_inner: thr=%p, num_stack_args=%ld, " - "call_flags=0x%08lx (ignorerec=%ld, constructor=%ld), " - "valstack_top=%ld, idx_func=%ld, idx_args=%ld, rec_depth=%ld/%ld, " - "entry_valstack_bottom_index=%ld, entry_callstack_top=%ld, entry_catchstack_top=%ld, " - "entry_call_recursion_depth=%ld, entry_curr_thread=%p, entry_thread_state=%ld", - (void *) thr, - (long) num_stack_args, - (unsigned long) call_flags, - (long) ((call_flags & DUK_CALL_FLAG_IGNORE_RECLIMIT) != 0 ? 1 : 0), - (long) ((call_flags & DUK_CALL_FLAG_CONSTRUCTOR_CALL) != 0 ? 1 : 0), - (long) duk_get_top(ctx), - (long) idx_func, - (long) (idx_func + 2), - (long) thr->heap->call_recursion_depth, - (long) thr->heap->call_recursion_limit, - (long) entry_valstack_bottom_index, - (long) entry_callstack_top, - (long) entry_catchstack_top, - (long) entry_call_recursion_depth, - (void *) entry_curr_thread, - (long) entry_thread_state)); - - - /* - * Thread state check and book-keeping. - */ - - if (thr == thr->heap->curr_thread) { - /* same thread */ - if (thr->state != DUK_HTHREAD_STATE_RUNNING) { - /* should actually never happen, but check anyway */ - goto thread_state_error; - } - } else { - /* different thread */ - DUK_ASSERT(thr->heap->curr_thread == NULL || - thr->heap->curr_thread->state == DUK_HTHREAD_STATE_RUNNING); - if (thr->state != DUK_HTHREAD_STATE_INACTIVE) { - goto thread_state_error; - } - DUK_HEAP_SWITCH_THREAD(thr->heap, thr); - thr->state = DUK_HTHREAD_STATE_RUNNING; - - /* Note: multiple threads may be simultaneously in the RUNNING - * state, but not in the same "resume chain". - */ - } - DUK_ASSERT(thr->heap->curr_thread == thr); - DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_RUNNING); - - /* - * C call recursion depth check, which provides a reasonable upper - * bound on maximum C stack size (arbitrary C stack growth is only - * possible by recursive handle_call / handle_safe_call calls). - */ - - /* XXX: remove DUK_CALL_FLAG_IGNORE_RECLIMIT flag: there's now the - * reclimit bump? - */ - - DUK_ASSERT(thr->heap->call_recursion_depth >= 0); - DUK_ASSERT(thr->heap->call_recursion_depth <= thr->heap->call_recursion_limit); - if (call_flags & DUK_CALL_FLAG_IGNORE_RECLIMIT) { - DUK_DD(DUK_DDPRINT("ignoring reclimit for this call (probably an errhandler call)")); - } else { - if (thr->heap->call_recursion_depth >= thr->heap->call_recursion_limit) { - /* XXX: error message is a bit misleading: we reached a recursion - * limit which is also essentially the same as a C callstack limit - * (except perhaps with some relaxed threading assumptions). - */ - DUK_ERROR_RANGE(thr, DUK_STR_C_CALLSTACK_LIMIT); - } - thr->heap->call_recursion_depth++; - } - - /* - * Check the function type, handle bound function chains, and prepare - * parameters for the rest of the call handling. Also figure out the - * effective 'this' binding, which replaces the current value at - * idx_func + 1. - * - * If the target function is a 'bound' one, follow the chain of 'bound' - * functions until a non-bound function is found. During this process, - * bound arguments are 'prepended' to existing ones, and the "this" - * binding is overridden. See E5 Section 15.3.4.5.1. - * - * Lightfunc detection happens here too. Note that lightweight functions - * can be wrapped by (non-lightweight) bound functions so we must resolve - * the bound function chain first. - */ - - func = duk__nonbound_func_lookup(ctx, idx_func, &num_stack_args, &tv_func, call_flags); - DUK_TVAL_SET_TVAL(&tv_func_copy, tv_func); - tv_func = &tv_func_copy; /* local copy to avoid relookups */ - - DUK_ASSERT(func == NULL || !DUK_HOBJECT_HAS_BOUND(func)); - DUK_ASSERT(func == NULL || (DUK_HOBJECT_IS_COMPILEDFUNCTION(func) || - DUK_HOBJECT_IS_NATIVEFUNCTION(func))); - - duk__coerce_effective_this_binding(thr, func, idx_func + 1); - DUK_DDD(DUK_DDDPRINT("effective 'this' binding is: %!T", - (duk_tval *) duk_get_tval(ctx, idx_func + 1))); - - /* [ ... func this arg1 ... argN ] */ - - /* - * Setup a preliminary activation and figure out nargs/nregs. - * - * Don't touch valstack_bottom or valstack_top yet so that Duktape API - * calls work normally. - */ - - duk_hthread_callstack_grow(thr); - - if (thr->callstack_top > 0) { - /* - * Update idx_retval of current activation. - * - * Although it might seem this is not necessary (bytecode executor - * does this for Ecmascript-to-Ecmascript calls; other calls are - * handled here), this turns out to be necessary for handling yield - * and resume. For them, an Ecmascript-to-native call happens, and - * the Ecmascript call's idx_retval must be set for things to work. - */ - - (thr->callstack + thr->callstack_top - 1)->idx_retval = entry_valstack_bottom_index + idx_func; - } - - DUK_ASSERT(thr->callstack_top < thr->callstack_size); - act = thr->callstack + thr->callstack_top; - thr->callstack_top++; - DUK_ASSERT(thr->callstack_top <= thr->callstack_size); - DUK_ASSERT(thr->valstack_top > thr->valstack_bottom); /* at least effective 'this' */ - DUK_ASSERT(func == NULL || !DUK_HOBJECT_HAS_BOUND(func)); - - act->flags = 0; - - /* For now all calls except Ecma-to-Ecma calls prevent a yield. */ - act->flags |= DUK_ACT_FLAG_PREVENT_YIELD; - if (call_flags & DUK_CALL_FLAG_CONSTRUCTOR_CALL) { - act->flags |= DUK_ACT_FLAG_CONSTRUCT; - } - if (call_flags & DUK_CALL_FLAG_DIRECT_EVAL) { - act->flags |= DUK_ACT_FLAG_DIRECT_EVAL; - } - - /* These base values are never used, but if the compiler doesn't know - * that DUK_ERROR() won't return, these are needed to silence warnings. - * On the other hand, scan-build will warn about the values not being - * used, so add a DUK_UNREF. - */ - nargs = 0; DUK_UNREF(nargs); - nregs = 0; DUK_UNREF(nregs); - - if (DUK_LIKELY(func != NULL)) { - if (DUK_HOBJECT_HAS_STRICT(func)) { - act->flags |= DUK_ACT_FLAG_STRICT; - } - if (DUK_HOBJECT_IS_COMPILEDFUNCTION(func)) { - nargs = ((duk_hcompiledfunction *) func)->nargs; - nregs = ((duk_hcompiledfunction *) func)->nregs; - DUK_ASSERT(nregs >= nargs); - } else if (DUK_HOBJECT_IS_NATIVEFUNCTION(func)) { - /* Note: nargs (and nregs) may be negative for a native, - * function, which indicates that the function wants the - * input stack "as is" (i.e. handles "vararg" arguments). - */ - nargs = ((duk_hnativefunction *) func)->nargs; - nregs = nargs; - } else { - /* XXX: this should be an assert */ - DUK_ERROR_TYPE(thr, DUK_STR_NOT_CALLABLE); - } - } else { - duk_small_uint_t lf_flags; - - DUK_ASSERT(DUK_TVAL_IS_LIGHTFUNC(tv_func)); - lf_flags = DUK_TVAL_GET_LIGHTFUNC_FLAGS(tv_func); - nargs = DUK_LFUNC_FLAGS_GET_NARGS(lf_flags); - if (nargs == DUK_LFUNC_NARGS_VARARGS) { - nargs = -1; /* vararg */ - } - nregs = nargs; - - act->flags |= DUK_ACT_FLAG_STRICT; - } - - act->func = func; /* NULL for lightfunc */ - act->var_env = NULL; - act->lex_env = NULL; -#if defined(DUK_USE_NONSTD_FUNC_CALLER_PROPERTY) - act->prev_caller = NULL; -#endif - act->curr_pc = NULL; -#if defined(DUK_USE_DEBUGGER_SUPPORT) - act->prev_line = 0; -#endif - act->idx_bottom = entry_valstack_bottom_index + idx_func + 2; -#if 0 /* topmost activation idx_retval is considered garbage, no need to init */ - act->idx_retval = 0; -#endif - DUK_TVAL_SET_TVAL(&act->tv_func, tv_func); /* borrowed, no refcount */ - - /* XXX: remove the preventcount and make yield walk the callstack? - * Or perhaps just use a single flag, not a counter, faster to just - * set and restore? - */ - if (act->flags & DUK_ACT_FLAG_PREVENT_YIELD) { - /* duk_hthread_callstack_unwind() will decrease this on unwind */ - thr->callstack_preventcount++; - } - - /* XXX: Is this INCREF necessary? 'func' is always a borrowed - * reference reachable through the value stack? If changed, stack - * unwind code also needs to be fixed to match. - */ - DUK_HOBJECT_INCREF_ALLOWNULL(thr, func); /* act->func */ - -#if defined(DUK_USE_NONSTD_FUNC_CALLER_PROPERTY) - if (func) { - duk__update_func_caller_prop(thr, func); - } - act = thr->callstack + thr->callstack_top - 1; -#endif - - /* [ ... func this arg1 ... argN ] */ - - /* - * Environment record creation and 'arguments' object creation. - * Named function expression name binding is handled by the - * compiler; the compiled function's parent env will contain - * the (immutable) binding already. - * - * This handling is now identical for C and Ecmascript functions. - * C functions always have the 'NEWENV' flag set, so their - * environment record initialization is delayed (which is good). - * - * Delayed creation (on demand) is handled in duk_js_var.c. - */ - - DUK_ASSERT(func == NULL || !DUK_HOBJECT_HAS_BOUND(func)); /* bound function chain has already been resolved */ - - if (DUK_LIKELY(func != NULL)) { - if (DUK_LIKELY(DUK_HOBJECT_HAS_NEWENV(func))) { - if (DUK_LIKELY(!DUK_HOBJECT_HAS_CREATEARGS(func))) { - /* Use a new environment but there's no 'arguments' object; - * delayed environment initialization. This is the most - * common case. - */ - DUK_ASSERT(act->lex_env == NULL); - DUK_ASSERT(act->var_env == NULL); - } else { - /* Use a new environment and there's an 'arguments' object. - * We need to initialize it right now. - */ - - /* third arg: absolute index (to entire valstack) of idx_bottom of new activation */ - env = duk_create_activation_environment_record(thr, func, act->idx_bottom); - DUK_ASSERT(env != NULL); - - /* [ ... func this arg1 ... argN envobj ] */ - - DUK_ASSERT(DUK_HOBJECT_HAS_CREATEARGS(func)); - duk__handle_createargs_for_call(thr, func, env, num_stack_args); - - /* [ ... func this arg1 ... argN envobj ] */ - - act = thr->callstack + thr->callstack_top - 1; - act->lex_env = env; - act->var_env = env; - DUK_HOBJECT_INCREF(thr, env); - DUK_HOBJECT_INCREF(thr, env); /* XXX: incref by count (2) directly */ - duk_pop(ctx); - } - } else { - /* Use existing env (e.g. for non-strict eval); cannot have - * an own 'arguments' object (but can refer to an existing one). - */ - - DUK_ASSERT(!DUK_HOBJECT_HAS_CREATEARGS(func)); - - duk__handle_oldenv_for_call(thr, func, act); - - DUK_ASSERT(act->lex_env != NULL); - DUK_ASSERT(act->var_env != NULL); - } - } else { - /* Lightfuncs are always native functions and have "newenv". */ - DUK_ASSERT(act->lex_env == NULL); - DUK_ASSERT(act->var_env == NULL); - } - - /* [ ... func this arg1 ... argN ] */ - - /* - * Setup value stack: clamp to 'nargs', fill up to 'nregs' - * - * Value stack may either grow or shrink, depending on the - * number of func registers and the number of actual arguments. - * If nregs >= 0, func wants args clamped to 'nargs'; else it - * wants all args (= 'num_stack_args'). - */ - - /* XXX: optimize value stack operation */ - /* XXX: don't want to shrink allocation here */ - - duk__adjust_valstack_and_top(thr, - num_stack_args, - idx_func + 2, - nregs, - nargs, - func); - - /* - * Determine call type, then finalize activation, shift to - * new value stack bottom, and call the target. - */ - - if (func != NULL && DUK_HOBJECT_IS_COMPILEDFUNCTION(func)) { - /* - * Ecmascript call - */ - - duk_tval *tv_ret; - duk_tval *tv_funret; - - DUK_ASSERT(func != NULL); - DUK_ASSERT(DUK_HOBJECT_HAS_COMPILEDFUNCTION(func)); - act->curr_pc = DUK_HCOMPILEDFUNCTION_GET_CODE_BASE(thr->heap, (duk_hcompiledfunction *) func); - - thr->valstack_bottom = thr->valstack_bottom + idx_func + 2; - /* keep current valstack_top */ - DUK_ASSERT(thr->valstack_bottom >= thr->valstack); - DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); - DUK_ASSERT(thr->valstack_end >= thr->valstack_top); - - /* [ ... func this | arg1 ... argN ] ('this' must precede new bottom) */ - - /* - * Bytecode executor call. - * - * Execute bytecode, handling any recursive function calls and - * thread resumptions. Returns when execution would return from - * the entry level activation. When the executor returns, a - * single return value is left on the stack top. - * - * The only possible longjmp() is an error (DUK_LJ_TYPE_THROW), - * other types are handled internally by the executor. - */ - - /* thr->ptr_curr_pc is set by bytecode executor early on entry */ - DUK_ASSERT(thr->ptr_curr_pc == NULL); - DUK_DDD(DUK_DDDPRINT("entering bytecode execution")); - duk_js_execute_bytecode(thr); - DUK_DDD(DUK_DDDPRINT("returned from bytecode execution")); - - /* Unwind. */ - - DUK_ASSERT(thr->catchstack_top >= entry_catchstack_top); /* may need unwind */ - DUK_ASSERT(thr->callstack_top == entry_callstack_top + 1); - DUK_ASSERT(thr->callstack_top == entry_callstack_top + 1); - duk_hthread_catchstack_unwind(thr, entry_catchstack_top); - duk_hthread_catchstack_shrink_check(thr); - duk_hthread_callstack_unwind(thr, entry_callstack_top); - duk_hthread_callstack_shrink_check(thr); - - thr->valstack_bottom = thr->valstack + entry_valstack_bottom_index; - /* keep current valstack_top */ - DUK_ASSERT(thr->valstack_bottom >= thr->valstack); - DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); - DUK_ASSERT(thr->valstack_end >= thr->valstack_top); - DUK_ASSERT(thr->valstack_top - thr->valstack_bottom >= idx_func + 1); - - /* Return value handling. */ - - /* [ ... func this (crud) retval ] */ - - tv_ret = thr->valstack_bottom + idx_func; - tv_funret = thr->valstack_top - 1; -#if defined(DUK_USE_FASTINT) - /* Explicit check for fastint downgrade. */ - DUK_TVAL_CHKFAST_INPLACE(tv_funret); -#endif - DUK_TVAL_SET_TVAL_UPDREF(thr, tv_ret, tv_funret); /* side effects */ - } else { - /* - * Native call. - */ - - duk_tval *tv_ret; - duk_tval *tv_funret; - - thr->valstack_bottom = thr->valstack_bottom + idx_func + 2; - /* keep current valstack_top */ - DUK_ASSERT(thr->valstack_bottom >= thr->valstack); - DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); - DUK_ASSERT(thr->valstack_end >= thr->valstack_top); - DUK_ASSERT(func == NULL || ((duk_hnativefunction *) func)->func != NULL); - - /* [ ... func this | arg1 ... argN ] ('this' must precede new bottom) */ - - /* For native calls must be NULL so we don't sync back */ - DUK_ASSERT(thr->ptr_curr_pc == NULL); - - if (func) { - rc = ((duk_hnativefunction *) func)->func((duk_context *) thr); - } else { - duk_c_function funcptr = DUK_TVAL_GET_LIGHTFUNC_FUNCPTR(tv_func); - rc = funcptr((duk_context *) thr); - } - - /* Automatic error throwing, retval check. */ - - if (rc < 0) { - duk_error_throw_from_negative_rc(thr, rc); - DUK_UNREACHABLE(); - } else if (rc > 1) { - DUK_ERROR_API(thr, "c function returned invalid rc"); - } - DUK_ASSERT(rc == 0 || rc == 1); - - /* Unwind. */ - - DUK_ASSERT(thr->catchstack_top == entry_catchstack_top); /* no need to unwind */ - DUK_ASSERT(thr->callstack_top == entry_callstack_top + 1); - duk_hthread_callstack_unwind(thr, entry_callstack_top); - duk_hthread_callstack_shrink_check(thr); - - thr->valstack_bottom = thr->valstack + entry_valstack_bottom_index; - /* keep current valstack_top */ - DUK_ASSERT(thr->valstack_bottom >= thr->valstack); - DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); - DUK_ASSERT(thr->valstack_end >= thr->valstack_top); - DUK_ASSERT(thr->valstack_top - thr->valstack_bottom >= idx_func + 1); - - /* Return value handling. */ - - /* XXX: should this happen in the callee's activation or after unwinding? */ - tv_ret = thr->valstack_bottom + idx_func; - if (rc == 0) { - DUK_TVAL_SET_UNDEFINED_UPDREF(thr, tv_ret); /* side effects */ - } else { - /* [ ... func this (crud) retval ] */ - tv_funret = thr->valstack_top - 1; -#if defined(DUK_USE_FASTINT) - /* Explicit check for fastint downgrade. */ - DUK_TVAL_CHKFAST_INPLACE(tv_funret); -#endif - DUK_TVAL_SET_TVAL_UPDREF(thr, tv_ret, tv_funret); /* side effects */ - } - } - - duk_set_top(ctx, idx_func + 1); /* XXX: unnecessary, handle in adjust */ - - /* [ ... retval ] */ - - /* Ensure there is internal valstack spare before we exit; this may - * throw an alloc error. The same guaranteed size must be available - * as before the call. This is not optimal now: we store the valstack - * allocated size during entry; this value may be higher than the - * minimal guarantee for an application. - */ - - /* XXX: we should never shrink here; when we error out later, we'd - * need to potentially grow the value stack in error unwind which could - * cause another error. - */ - - (void) duk_valstack_resize_raw((duk_context *) thr, - entry_valstack_end, /* same as during entry */ - DUK_VSRESIZE_FLAG_SHRINK | /* flags */ - DUK_VSRESIZE_FLAG_COMPACT | - DUK_VSRESIZE_FLAG_THROW); - - /* Restore entry thread executor curr_pc stack frame pointer. */ - thr->ptr_curr_pc = entry_ptr_curr_pc; - - DUK_HEAP_SWITCH_THREAD(thr->heap, entry_curr_thread); /* may be NULL */ - thr->state = (duk_uint8_t) entry_thread_state; - - DUK_ASSERT((thr->state == DUK_HTHREAD_STATE_INACTIVE && thr->heap->curr_thread == NULL) || /* first call */ - (thr->state == DUK_HTHREAD_STATE_INACTIVE && thr->heap->curr_thread != NULL) || /* other call */ - (thr->state == DUK_HTHREAD_STATE_RUNNING && thr->heap->curr_thread == thr)); /* current thread */ - - thr->heap->call_recursion_depth = entry_call_recursion_depth; - - /* If the debugger is active we need to force an interrupt so that - * debugger breakpoints are rechecked. This is important for function - * calls caused by side effects (e.g. when doing a DUK_OP_GETPROP), see - * GH-303. Only needed for success path, error path always causes a - * breakpoint recheck in the executor. It would be enough to set this - * only when returning to an Ecmascript activation, but setting the flag - * on every return should have no ill effect. - */ -#if defined(DUK_USE_DEBUGGER_SUPPORT) - if (DUK_HEAP_IS_DEBUGGER_ATTACHED(thr->heap)) { - DUK_DD(DUK_DDPRINT("returning with debugger enabled, force interrupt")); - DUK_ASSERT(thr->interrupt_counter <= thr->interrupt_init); - thr->interrupt_init -= thr->interrupt_counter; - thr->interrupt_counter = 0; - thr->heap->dbg_force_restart = 1; - } -#endif - -#if defined(DUK_USE_INTERRUPT_COUNTER) && defined(DUK_USE_DEBUG) - duk__interrupt_fixup(thr, entry_curr_thread); -#endif - - return; - - thread_state_error: - DUK_ERROR_FMT1(thr, DUK_ERR_TYPE_ERROR, "invalid thread state for call (%ld)", (long) thr->state); - DUK_UNREACHABLE(); - return; /* never executed */ -} - -DUK_LOCAL void duk__handle_call_error(duk_hthread *thr, - duk_size_t entry_valstack_bottom_index, - duk_size_t entry_valstack_end, - duk_size_t entry_catchstack_top, - duk_size_t entry_callstack_top, - duk_int_t entry_call_recursion_depth, - duk_hthread *entry_curr_thread, - duk_uint_fast8_t entry_thread_state, - duk_instr_t **entry_ptr_curr_pc, - duk_idx_t idx_func, - duk_jmpbuf *old_jmpbuf_ptr) { - duk_context *ctx; - duk_tval *tv_ret; - - ctx = (duk_context *) thr; - - DUK_DDD(DUK_DDDPRINT("error caught during duk__handle_call_inner(): %!T", - (duk_tval *) &thr->heap->lj.value1)); - - /* Other longjmp types are handled by executor before propagating - * the error here. - */ - DUK_ASSERT(thr->heap->lj.type == DUK_LJ_TYPE_THROW); - DUK_ASSERT(thr->callstack_top >= entry_callstack_top); - DUK_ASSERT(thr->catchstack_top >= entry_catchstack_top); - - /* We don't need to sync back thr->ptr_curr_pc here because - * the bytecode executor always has a setjmp catchpoint which - * does that before errors propagate to here. - */ - DUK_ASSERT(thr->ptr_curr_pc == NULL); - - /* Restore the previous setjmp catcher so that any error in - * error handling will propagate outwards rather than re-enter - * the same handler. However, the error handling path must be - * designed to be error free so that sandboxing guarantees are - * reliable, see e.g. https://github.com/svaarala/duktape/issues/476. - */ - thr->heap->lj.jmpbuf_ptr = old_jmpbuf_ptr; - - /* XXX: callstack unwind may now throw an error when closing - * scopes; this is a sandboxing issue, described in: - * https://github.com/svaarala/duktape/issues/476 - */ - duk_hthread_catchstack_unwind(thr, entry_catchstack_top); - duk_hthread_catchstack_shrink_check(thr); - duk_hthread_callstack_unwind(thr, entry_callstack_top); - duk_hthread_callstack_shrink_check(thr); - - thr->valstack_bottom = thr->valstack + entry_valstack_bottom_index; - tv_ret = thr->valstack_bottom + idx_func; /* XXX: byte offset? */ - DUK_TVAL_SET_TVAL_UPDREF(thr, tv_ret, &thr->heap->lj.value1); /* side effects */ -#if defined(DUK_USE_FASTINT) - /* Explicit check for fastint downgrade. */ - DUK_TVAL_CHKFAST_INPLACE(tv_ret); -#endif - duk_set_top(ctx, idx_func + 1); /* XXX: could be eliminated with valstack adjust */ - - /* [ ... errobj ] */ - - /* Ensure there is internal valstack spare before we exit; this may - * throw an alloc error. The same guaranteed size must be available - * as before the call. This is not optimal now: we store the valstack - * allocated size during entry; this value may be higher than the - * minimal guarantee for an application. - */ - - /* XXX: this needs to be reworked so that we never shrink the value - * stack on function entry so that we never need to grow it here. - * Needing to grow here is a sandboxing issue because we need to - * allocate which may cause an error in the error handling path - * and thus propagate an error out of a protected call. - */ - - (void) duk_valstack_resize_raw((duk_context *) thr, - entry_valstack_end, /* same as during entry */ - DUK_VSRESIZE_FLAG_SHRINK | /* flags */ - DUK_VSRESIZE_FLAG_COMPACT | - DUK_VSRESIZE_FLAG_THROW); - - - /* These are just convenience "wiping" of state. Side effects should - * not be an issue here: thr->heap and thr->heap->lj have a stable - * pointer. Finalizer runs etc capture even out-of-memory errors so - * nothing should throw here. - */ - thr->heap->lj.type = DUK_LJ_TYPE_UNKNOWN; - thr->heap->lj.iserror = 0; - DUK_TVAL_SET_UNDEFINED_UPDREF(thr, &thr->heap->lj.value1); /* side effects */ - DUK_TVAL_SET_UNDEFINED_UPDREF(thr, &thr->heap->lj.value2); /* side effects */ - - /* Restore entry thread executor curr_pc stack frame pointer. */ - thr->ptr_curr_pc = entry_ptr_curr_pc; - - DUK_HEAP_SWITCH_THREAD(thr->heap, entry_curr_thread); /* may be NULL */ - thr->state = (duk_uint8_t) entry_thread_state; - - DUK_ASSERT((thr->state == DUK_HTHREAD_STATE_INACTIVE && thr->heap->curr_thread == NULL) || /* first call */ - (thr->state == DUK_HTHREAD_STATE_INACTIVE && thr->heap->curr_thread != NULL) || /* other call */ - (thr->state == DUK_HTHREAD_STATE_RUNNING && thr->heap->curr_thread == thr)); /* current thread */ - - thr->heap->call_recursion_depth = entry_call_recursion_depth; - - /* If the debugger is active we need to force an interrupt so that - * debugger breakpoints are rechecked. This is important for function - * calls caused by side effects (e.g. when doing a DUK_OP_GETPROP), see - * GH-303. Only needed for success path, error path always causes a - * breakpoint recheck in the executor. It would be enough to set this - * only when returning to an Ecmascript activation, but setting the flag - * on every return should have no ill effect. - */ -#if defined(DUK_USE_DEBUGGER_SUPPORT) - if (DUK_HEAP_IS_DEBUGGER_ATTACHED(thr->heap)) { - DUK_DD(DUK_DDPRINT("returning with debugger enabled, force interrupt")); - DUK_ASSERT(thr->interrupt_counter <= thr->interrupt_init); - thr->interrupt_init -= thr->interrupt_counter; - thr->interrupt_counter = 0; - thr->heap->dbg_force_restart = 1; - } -#endif - -#if defined(DUK_USE_INTERRUPT_COUNTER) && defined(DUK_USE_DEBUG) - duk__interrupt_fixup(thr, entry_curr_thread); -#endif -} - -/* - * duk_handle_safe_call(): make a "C protected call" within the - * current activation. - * - * The allowed thread states for making a call are the same as for - * duk_handle_call_xxx(). - * - * Error handling is similar to duk_handle_call_xxx(); errors may be thrown - * (and result in a fatal error) for insane arguments. - */ - -/* XXX: bump preventcount by one for the duration of this call? */ - -DUK_INTERNAL duk_int_t duk_handle_safe_call(duk_hthread *thr, - duk_safe_call_function func, - duk_idx_t num_stack_args, - duk_idx_t num_stack_rets) { - duk_context *ctx = (duk_context *) thr; - duk_size_t entry_valstack_bottom_index; - duk_size_t entry_callstack_top; - duk_size_t entry_catchstack_top; - duk_int_t entry_call_recursion_depth; - duk_hthread *entry_curr_thread; - duk_uint_fast8_t entry_thread_state; - duk_instr_t **entry_ptr_curr_pc; - duk_jmpbuf *old_jmpbuf_ptr = NULL; - duk_jmpbuf our_jmpbuf; - duk_idx_t idx_retbase; - duk_int_t retval; - - DUK_ASSERT(thr != NULL); - DUK_ASSERT(ctx != NULL); - - /* Note: careful with indices like '-x'; if 'x' is zero, it refers to bottom */ - entry_valstack_bottom_index = (duk_size_t) (thr->valstack_bottom - thr->valstack); - entry_callstack_top = thr->callstack_top; - entry_catchstack_top = thr->catchstack_top; - entry_call_recursion_depth = thr->heap->call_recursion_depth; - entry_curr_thread = thr->heap->curr_thread; /* Note: may be NULL if first call */ - entry_thread_state = thr->state; - entry_ptr_curr_pc = thr->ptr_curr_pc; /* may be NULL */ - idx_retbase = duk_get_top(ctx) - num_stack_args; /* Note: not a valid stack index if num_stack_args == 0 */ - - /* Note: cannot portably debug print a function pointer, hence 'func' not printed! */ - DUK_DD(DUK_DDPRINT("duk_handle_safe_call: thr=%p, num_stack_args=%ld, num_stack_rets=%ld, " - "valstack_top=%ld, idx_retbase=%ld, rec_depth=%ld/%ld, " - "entry_valstack_bottom_index=%ld, entry_callstack_top=%ld, entry_catchstack_top=%ld, " - "entry_call_recursion_depth=%ld, entry_curr_thread=%p, entry_thread_state=%ld", - (void *) thr, - (long) num_stack_args, - (long) num_stack_rets, - (long) duk_get_top(ctx), - (long) idx_retbase, - (long) thr->heap->call_recursion_depth, - (long) thr->heap->call_recursion_limit, - (long) entry_valstack_bottom_index, - (long) entry_callstack_top, - (long) entry_catchstack_top, - (long) entry_call_recursion_depth, - (void *) entry_curr_thread, - (long) entry_thread_state)); - - if (idx_retbase < 0) { - /* Since stack indices are not reliable, we can't do anything useful - * here. Invoke the existing setjmp catcher, or if it doesn't exist, - * call the fatal error handler. - */ - - DUK_ERROR_API(thr, DUK_STR_INVALID_CALL_ARGS); - } - - /* setjmp catchpoint setup */ - - old_jmpbuf_ptr = thr->heap->lj.jmpbuf_ptr; - thr->heap->lj.jmpbuf_ptr = &our_jmpbuf; - -#if defined(DUK_USE_CPP_EXCEPTIONS) - try { -#else - DUK_ASSERT(thr->heap->lj.jmpbuf_ptr == &our_jmpbuf); - if (DUK_SETJMP(our_jmpbuf.jb) == 0) { - /* Success path. */ -#endif - DUK_DDD(DUK_DDDPRINT("safe_call setjmp catchpoint setup complete")); - - duk__handle_safe_call_inner(thr, - func, - idx_retbase, - num_stack_rets, - entry_valstack_bottom_index, - entry_callstack_top, - entry_catchstack_top); - - /* Longjmp state is kept clean in success path */ - DUK_ASSERT(thr->heap->lj.type == DUK_LJ_TYPE_UNKNOWN); - DUK_ASSERT(thr->heap->lj.iserror == 0); - DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(&thr->heap->lj.value1)); - DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(&thr->heap->lj.value2)); - - /* Note: either pointer may be NULL (at entry), so don't assert */ - thr->heap->lj.jmpbuf_ptr = old_jmpbuf_ptr; - - retval = DUK_EXEC_SUCCESS; -#if defined(DUK_USE_CPP_EXCEPTIONS) - } catch (duk_internal_exception &exc) { - DUK_UNREF(exc); -#else - } else { - /* Error path. */ -#endif - duk__handle_safe_call_error(thr, - idx_retbase, - num_stack_rets, - entry_valstack_bottom_index, - entry_callstack_top, - entry_catchstack_top, - old_jmpbuf_ptr); - - /* Longjmp state is cleaned up by error handling */ - DUK_ASSERT(thr->heap->lj.type == DUK_LJ_TYPE_UNKNOWN); - DUK_ASSERT(thr->heap->lj.iserror == 0); - DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(&thr->heap->lj.value1)); - DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(&thr->heap->lj.value2)); - - retval = DUK_EXEC_ERROR; - } -#if defined(DUK_USE_CPP_EXCEPTIONS) - catch (std::exception &exc) { - const char *what = exc.what(); - if (!what) { - what = "unknown"; - } - DUK_D(DUK_DPRINT("unexpected c++ std::exception (perhaps thrown by user code)")); - try { - DUK_ERROR_FMT1(thr, DUK_ERR_API_ERROR, "caught invalid c++ std::exception '%s' (perhaps thrown by user code)", what); - } catch (duk_internal_exception exc) { - DUK_D(DUK_DPRINT("caught api error thrown from unexpected c++ std::exception")); - DUK_UNREF(exc); - duk__handle_safe_call_error(thr, - idx_retbase, - num_stack_rets, - entry_valstack_bottom_index, - entry_callstack_top, - entry_catchstack_top, - old_jmpbuf_ptr); - retval = DUK_EXEC_ERROR; - } - } catch (...) { - DUK_D(DUK_DPRINT("unexpected c++ exception (perhaps thrown by user code)")); - try { - DUK_ERROR_API(thr, "caught invalid c++ exception (perhaps thrown by user code)"); - } catch (duk_internal_exception exc) { - DUK_D(DUK_DPRINT("caught api error thrown from unexpected c++ exception")); - DUK_UNREF(exc); - duk__handle_safe_call_error(thr, - idx_retbase, - num_stack_rets, - entry_valstack_bottom_index, - entry_callstack_top, - entry_catchstack_top, - old_jmpbuf_ptr); - retval = DUK_EXEC_ERROR; - } - } -#endif - - DUK_ASSERT(thr->heap->lj.jmpbuf_ptr == old_jmpbuf_ptr); /* success/error path both do this */ - - duk__handle_safe_call_shared(thr, - idx_retbase, - num_stack_rets, - entry_call_recursion_depth, - entry_curr_thread, - entry_thread_state, - entry_ptr_curr_pc); - - return retval; -} - -DUK_LOCAL void duk__handle_safe_call_inner(duk_hthread *thr, - duk_safe_call_function func, - duk_idx_t idx_retbase, - duk_idx_t num_stack_rets, - duk_size_t entry_valstack_bottom_index, - duk_size_t entry_callstack_top, - duk_size_t entry_catchstack_top) { - duk_context *ctx; - duk_ret_t rc; - - DUK_ASSERT(thr != NULL); - ctx = (duk_context *) thr; - DUK_ASSERT_CTX_VALID(ctx); - DUK_UNREF(entry_valstack_bottom_index); - DUK_UNREF(entry_callstack_top); - DUK_UNREF(entry_catchstack_top); - - /* - * Thread state check and book-keeping. - */ - - if (thr == thr->heap->curr_thread) { - /* same thread */ - if (thr->state != DUK_HTHREAD_STATE_RUNNING) { - /* should actually never happen, but check anyway */ - goto thread_state_error; - } - } else { - /* different thread */ - DUK_ASSERT(thr->heap->curr_thread == NULL || - thr->heap->curr_thread->state == DUK_HTHREAD_STATE_RUNNING); - if (thr->state != DUK_HTHREAD_STATE_INACTIVE) { - goto thread_state_error; - } - DUK_HEAP_SWITCH_THREAD(thr->heap, thr); - thr->state = DUK_HTHREAD_STATE_RUNNING; - - /* Note: multiple threads may be simultaneously in the RUNNING - * state, but not in the same "resume chain". - */ - } - - DUK_ASSERT(thr->heap->curr_thread == thr); - DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_RUNNING); - - /* - * Recursion limit check. - * - * Note: there is no need for an "ignore recursion limit" flag - * for duk_handle_safe_call now. - */ - - DUK_ASSERT(thr->heap->call_recursion_depth >= 0); - DUK_ASSERT(thr->heap->call_recursion_depth <= thr->heap->call_recursion_limit); - if (thr->heap->call_recursion_depth >= thr->heap->call_recursion_limit) { - /* XXX: error message is a bit misleading: we reached a recursion - * limit which is also essentially the same as a C callstack limit - * (except perhaps with some relaxed threading assumptions). - */ - DUK_ERROR_RANGE(thr, DUK_STR_C_CALLSTACK_LIMIT); - } - thr->heap->call_recursion_depth++; - - /* - * Valstack spare check - */ - - duk_require_stack(ctx, 0); /* internal spare */ - - /* - * Make the C call - */ - - rc = func(ctx); - - DUK_DDD(DUK_DDDPRINT("safe_call, func rc=%ld", (long) rc)); - - /* - * Valstack manipulation for results. - */ - - /* we're running inside the caller's activation, so no change in call/catch stack or valstack bottom */ - DUK_ASSERT(thr->callstack_top == entry_callstack_top); - DUK_ASSERT(thr->catchstack_top == entry_catchstack_top); - DUK_ASSERT(thr->valstack_bottom >= thr->valstack); - DUK_ASSERT((duk_size_t) (thr->valstack_bottom - thr->valstack) == entry_valstack_bottom_index); - DUK_ASSERT(thr->valstack_top >= thr->valstack_bottom); - DUK_ASSERT(thr->valstack_end >= thr->valstack_top); - - if (rc < 0) { - duk_error_throw_from_negative_rc(thr, rc); - } - DUK_ASSERT(rc >= 0); - - if (duk_get_top(ctx) < rc) { - DUK_ERROR_API(thr, "not enough stack values for safe_call rc"); - } - - DUK_ASSERT(thr->catchstack_top == entry_catchstack_top); /* no need to unwind */ - DUK_ASSERT(thr->callstack_top == entry_callstack_top); - - duk__safe_call_adjust_valstack(thr, idx_retbase, num_stack_rets, rc); - return; - - thread_state_error: - DUK_ERROR_FMT1(thr, DUK_ERR_TYPE_ERROR, "invalid thread state for safe_call (%ld)", (long) thr->state); - DUK_UNREACHABLE(); -} - -DUK_LOCAL void duk__handle_safe_call_error(duk_hthread *thr, - duk_idx_t idx_retbase, - duk_idx_t num_stack_rets, - duk_size_t entry_valstack_bottom_index, - duk_size_t entry_callstack_top, - duk_size_t entry_catchstack_top, - duk_jmpbuf *old_jmpbuf_ptr) { - duk_context *ctx; - - DUK_ASSERT(thr != NULL); - ctx = (duk_context *) thr; - DUK_ASSERT_CTX_VALID(ctx); - - /* - * Error during call. The error value is at heap->lj.value1. - * - * The very first thing we do is restore the previous setjmp catcher. - * This means that any error in error handling will propagate outwards - * instead of causing a setjmp() re-entry above. - */ - - DUK_DDD(DUK_DDDPRINT("error caught during protected duk_handle_safe_call()")); - - /* Other longjmp types are handled by executor before propagating - * the error here. - */ - DUK_ASSERT(thr->heap->lj.type == DUK_LJ_TYPE_THROW); - DUK_ASSERT(thr->callstack_top >= entry_callstack_top); - DUK_ASSERT(thr->catchstack_top >= entry_catchstack_top); - - /* Note: either pointer may be NULL (at entry), so don't assert. */ - thr->heap->lj.jmpbuf_ptr = old_jmpbuf_ptr; - - DUK_ASSERT(thr->catchstack_top >= entry_catchstack_top); - DUK_ASSERT(thr->callstack_top >= entry_callstack_top); - duk_hthread_catchstack_unwind(thr, entry_catchstack_top); - duk_hthread_catchstack_shrink_check(thr); - duk_hthread_callstack_unwind(thr, entry_callstack_top); - duk_hthread_callstack_shrink_check(thr); - thr->valstack_bottom = thr->valstack + entry_valstack_bottom_index; - - /* [ ... | (crud) ] */ - - /* XXX: space in valstack? see discussion in duk_handle_call_xxx(). */ - duk_push_tval(ctx, &thr->heap->lj.value1); - - /* [ ... | (crud) errobj ] */ - - DUK_ASSERT(duk_get_top(ctx) >= 1); /* at least errobj must be on stack */ - - /* check that the valstack has space for the final amount and any - * intermediate space needed; this is unoptimal but should be safe - */ - duk_require_stack_top(ctx, idx_retbase + num_stack_rets); /* final configuration */ - duk_require_stack(ctx, num_stack_rets); - - duk__safe_call_adjust_valstack(thr, idx_retbase, num_stack_rets, 1); /* 1 = num actual 'return values' */ - - /* [ ... | ] or [ ... | errobj (M * undefined)] where M = num_stack_rets - 1 */ - - /* These are just convenience "wiping" of state. Side effects should - * not be an issue here: thr->heap and thr->heap->lj have a stable - * pointer. Finalizer runs etc capture even out-of-memory errors so - * nothing should throw here. - */ - thr->heap->lj.type = DUK_LJ_TYPE_UNKNOWN; - thr->heap->lj.iserror = 0; - DUK_TVAL_SET_UNDEFINED_UPDREF(thr, &thr->heap->lj.value1); /* side effects */ - DUK_TVAL_SET_UNDEFINED_UPDREF(thr, &thr->heap->lj.value2); /* side effects */ -} - -DUK_LOCAL void duk__handle_safe_call_shared(duk_hthread *thr, - duk_idx_t idx_retbase, - duk_idx_t num_stack_rets, - duk_int_t entry_call_recursion_depth, - duk_hthread *entry_curr_thread, - duk_uint_fast8_t entry_thread_state, - duk_instr_t **entry_ptr_curr_pc) { - duk_context *ctx; - - DUK_ASSERT(thr != NULL); - ctx = (duk_context *) thr; - DUK_ASSERT_CTX_VALID(ctx); - DUK_UNREF(ctx); - DUK_UNREF(idx_retbase); - DUK_UNREF(num_stack_rets); - - /* Restore entry thread executor curr_pc stack frame pointer. */ - thr->ptr_curr_pc = entry_ptr_curr_pc; - - /* XXX: because we unwind stacks above, thr->heap->curr_thread is at - * risk of pointing to an already freed thread. This was indeed the - * case in test-bug-multithread-valgrind.c, until duk_handle_call() - * was fixed to restore thr->heap->curr_thread before rethrowing an - * uncaught error. - */ - DUK_HEAP_SWITCH_THREAD(thr->heap, entry_curr_thread); /* may be NULL */ - thr->state = (duk_uint8_t) entry_thread_state; - - DUK_ASSERT((thr->state == DUK_HTHREAD_STATE_INACTIVE && thr->heap->curr_thread == NULL) || /* first call */ - (thr->state == DUK_HTHREAD_STATE_INACTIVE && thr->heap->curr_thread != NULL) || /* other call */ - (thr->state == DUK_HTHREAD_STATE_RUNNING && thr->heap->curr_thread == thr)); /* current thread */ - - thr->heap->call_recursion_depth = entry_call_recursion_depth; - - /* stack discipline consistency check */ - DUK_ASSERT(duk_get_top(ctx) == idx_retbase + num_stack_rets); - - /* A debugger forced interrupt check is not needed here, as - * problematic safe calls are not caused by side effects. - */ - -#if defined(DUK_USE_INTERRUPT_COUNTER) && defined(DUK_USE_DEBUG) - duk__interrupt_fixup(thr, entry_curr_thread); -#endif -} - -/* - * Helper for handling an Ecmascript-to-Ecmascript call or an Ecmascript - * function (initial) Duktape.Thread.resume(). - * - * Compared to normal calls handled by duk_handle_call(), there are a - * bunch of differences: - * - * - the call is never protected - * - there is no C recursion depth increase (hence an "ignore recursion - * limit" flag is not applicable) - * - instead of making the call, this helper just performs the thread - * setup and returns; the bytecode executor
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