source: libcfa/src/exception.c @ 8ad5752

arm-ehjacob/cs343-translationnew-astnew-ast-unique-expr
Last change on this file since 8ad5752 was 8ad5752, checked in by Andrew Beach <ajbeach@…>, 17 months ago

Added tests for default exception handlers. Fixed a memory leak they revealed.

  • Property mode set to 100644
File size: 20.7 KB
Line 
1//
2// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
3//
4// The contents of this file are covered under the licence agreement in the
5// file "LICENCE" distributed with Cforall.
6//
7// exception.c --
8//
9// Author           : Andrew Beach
10// Created On       : Mon Jun 26 15:13:00 2017
11// Last Modified By : Andrew Beach
12// Last Modified On : Thr May 21 12:18:00 2020
13// Update Count     : 20
14//
15
16// Normally we would get this from the CFA prelude.
17#include <stddef.h> // for size_t
18
19#include "exception.h"
20
21// Implementation of the secret header is hardware dependent.
22#if !( defined( __x86_64 ) || defined( __i386 ) )
23#error Exception Handling: No known architecture detected.
24#endif
25
26#include <stdlib.h>
27#include <stdio.h>
28#include <unwind.h>
29#include <bits/debug.hfa>
30#include "stdhdr/assert.h"
31
32// FIX ME: temporary hack to keep ARM build working
33#ifndef _URC_FATAL_PHASE1_ERROR
34#define _URC_FATAL_PHASE1_ERROR 3
35#endif // ! _URC_FATAL_PHASE1_ERROR
36#ifndef _URC_FATAL_PHASE2_ERROR
37#define _URC_FATAL_PHASE2_ERROR 2
38#endif // ! _URC_FATAL_PHASE2_ERROR
39
40#include "lsda.h"
41
42/* The exception class for our exceptions. Because of the vendor component
43 * its value would not be standard.
44 * Vendor: UWPL
45 * Language: CFA\0
46 */
47const _Unwind_Exception_Class __cfaehm_exception_class = 0x4c50575500414643;
48
49// Base exception vtable is abstract, you should not have base exceptions.
50struct __cfaehm_base_exception_t_vtable
51                ___cfaehm_base_exception_t_vtable_instance = {
52        .parent = NULL,
53        .size = 0,
54        .copy = NULL,
55        .free = NULL,
56        .msg = NULL
57};
58
59
60// Temperary global exception context. Does not work with concurency.
61struct exception_context_t {
62        struct __cfaehm_try_resume_node * top_resume;
63
64        exception_t * current_exception;
65        int current_handler_index;
66} static shared_stack = {NULL, NULL, 0};
67
68// Get the current exception context.
69// There can be a single global until multithreading occurs, then each stack
70// needs its own. It will have to be updated to handle that.
71struct exception_context_t * this_exception_context() {
72        return &shared_stack;
73}
74
75
76// RESUMPTION ================================================================
77
78static void reset_top_resume(struct __cfaehm_try_resume_node ** store) {
79        this_exception_context()->top_resume = *store;
80}
81
82void __cfaehm_throw_resume(exception_t * except, void (*defaultHandler)(exception_t *)) {
83        struct exception_context_t * context = this_exception_context();
84
85        __cfadbg_print_safe(exception, "Throwing resumption exception\n");
86
87        __attribute__((cleanup(reset_top_resume)))
88        struct __cfaehm_try_resume_node * original_head = context->top_resume;
89        struct __cfaehm_try_resume_node * current = context->top_resume;
90
91        for ( ; current ; current = current->next) {
92                context->top_resume = current->next;
93                if (current->handler(except)) {
94                        return;
95                }
96        }
97
98        // No handler found, fall back to the default operation.
99        __cfadbg_print_safe(exception, "Unhandled exception\n");
100        defaultHandler(except);
101}
102
103// Do we control where exceptions get thrown even with concurency?
104// If not these are not quite thread safe, the cleanup hook has to
105// be added after the node is built but before it is made the top node.
106
107void __cfaehm_try_resume_setup(struct __cfaehm_try_resume_node * node,
108                        _Bool (*handler)(exception_t * except)) {
109        struct exception_context_t * context = this_exception_context();
110        node->next = context->top_resume;
111        node->handler = handler;
112        context->top_resume = node;
113}
114
115void __cfaehm_try_resume_cleanup(struct __cfaehm_try_resume_node * node) {
116        struct exception_context_t * context = this_exception_context();
117        context->top_resume = node->next;
118}
119
120
121// MEMORY MANAGEMENT =========================================================
122
123// How to clean up an exception in various situations.
124static void __cfaehm_exception_cleanup(
125                _Unwind_Reason_Code reason,
126                struct _Unwind_Exception * exception) {
127        switch (reason) {
128        case _URC_FOREIGN_EXCEPTION_CAUGHT:
129                // This one we could clean-up to allow cross-language exceptions.
130        case _URC_FATAL_PHASE1_ERROR:
131        case _URC_FATAL_PHASE2_ERROR:
132        default:
133                abort();
134        }
135}
136
137// We need a piece of storage to raise the exception, for now its a single
138// piece.
139static struct _Unwind_Exception this_exception_storage;
140
141struct __cfaehm_node {
142        struct __cfaehm_node * next;
143};
144
145#define NODE_TO_EXCEPT(node) ((exception_t *)(1 + (node)))
146#define EXCEPT_TO_NODE(except) ((struct __cfaehm_node *)(except) - 1)
147
148// Creates a copy of the indicated exception and sets current_exception to it.
149static void __cfaehm_allocate_exception( exception_t * except ) {
150        struct exception_context_t * context = this_exception_context();
151
152        // Allocate memory for the exception.
153        struct __cfaehm_node * store = malloc(
154                sizeof( struct __cfaehm_node ) + except->virtual_table->size );
155
156        if ( ! store ) {
157                // Failure: cannot allocate exception. Terminate thread.
158                abort(); // <- Although I think it might be the process.
159        }
160
161        // Add the node to the list:
162        store->next = EXCEPT_TO_NODE(context->current_exception);
163        context->current_exception = NODE_TO_EXCEPT(store);
164
165        // Copy the exception to storage.
166        except->virtual_table->copy( context->current_exception, except );
167
168        // Set up the exception storage.
169        this_exception_storage.exception_class = __cfaehm_exception_class;
170        this_exception_storage.exception_cleanup = __cfaehm_exception_cleanup;
171}
172
173// Delete the provided exception, unsetting current_exception if relivant.
174static void __cfaehm_delete_exception( exception_t * except ) {
175        struct exception_context_t * context = this_exception_context();
176
177        __cfadbg_print_safe(exception, "Deleting Exception\n");
178
179        // Remove the exception from the list.
180        struct __cfaehm_node * to_free = EXCEPT_TO_NODE(except);
181        struct __cfaehm_node * node;
182
183        if ( context->current_exception == except ) {
184                node = to_free->next;
185                context->current_exception = (node) ? NODE_TO_EXCEPT(node) : 0;
186        } else {
187                node = EXCEPT_TO_NODE(context->current_exception);
188                // It may always be in the first or second position.
189                while ( to_free != node->next ) {
190                        node = node->next;
191                }
192                node->next = to_free->next;
193        }
194
195        // Free the old exception node.
196        except->virtual_table->free( except );
197        free( to_free );
198}
199
200// CANCELLATION ==============================================================
201
202// Function needed by force unwind
203// It basically says to unwind the whole stack and then exit when we reach the end of the stack
204static _Unwind_Reason_Code _Stop_Fn(
205                int version,
206                _Unwind_Action actions,
207                _Unwind_Exception_Class exception_class,
208                struct _Unwind_Exception * unwind_exception,
209                struct _Unwind_Context * unwind_context,
210                void * stop_param) {
211        // Verify actions follow the rules we expect.
212        verify((actions & _UA_CLEANUP_PHASE) && (actions & _UA_FORCE_UNWIND));
213        verify(!(actions & (_UA_SEARCH_PHASE | _UA_HANDER_FRAME)));
214
215        if ( actions & _UA_END_OF_STACK ) {
216                exit(1);
217        } else {
218                return _URC_NO_REASON;
219        }
220}
221
222// Cancel the current stack, prefroming approprate clean-up and messaging.
223void __cfaehm_cancel_stack( exception_t * exception ) {
224        // TODO: Detect current stack and pick a particular stop-function.
225        _Unwind_Reason_Code ret;
226        ret = _Unwind_ForcedUnwind( &this_exception_storage, _Stop_Fn, (void*)0x22 );
227        printf("UNWIND ERROR %d after force unwind\n", ret);
228        abort();
229}
230
231
232// TERMINATION ===============================================================
233
234// If this isn't a rethrow (*except==0), delete the provided exception.
235void __cfaehm_cleanup_terminate( void * except ) {
236        if ( *(void**)except ) __cfaehm_delete_exception( *(exception_t **)except );
237}
238
239static void __cfaehm_cleanup_default( exception_t ** except ) {
240        __cfaehm_delete_exception( *except );
241        *except = NULL;
242}
243
244// The exception that is being thrown must already be stored.
245static void __cfaehm_begin_unwind(void(*defaultHandler)(exception_t *)) {
246        struct exception_context_t * context = this_exception_context();
247        struct _Unwind_Exception * storage = &this_exception_storage;
248        if ( NULL == context->current_exception ) {
249                printf("UNWIND ERROR missing exception in begin unwind\n");
250                abort();
251        }
252
253        // Call stdlibc to raise the exception
254        __cfadbg_print_safe(exception, "Begin unwinding (storage &p, context %p)\n", storage, context);
255        _Unwind_Reason_Code ret = _Unwind_RaiseException( storage );
256
257        // If we reach here it means something happened. For resumption to work we need to find a way
258        // to return back to here. Most of them will probably boil down to setting a global flag and
259        // making the phase 1 either stop or fail. Causing an error on purpose may help avoiding
260        // unnecessary work but it might have some weird side effects. If we just pretend no handler
261        // was found that would work but may be expensive for no reason since we will always search
262        // the whole stack.
263
264        // We did not simply reach the end of the stack without finding a handler. This is an error.
265        if ( ret != _URC_END_OF_STACK ) {
266                printf("UNWIND ERROR %d after raise exception\n", ret);
267                abort();
268        }
269
270        // No handler found, go to the default operation.
271        __cfadbg_print_safe(exception, "Uncaught exception %p\n", storage);
272
273        __attribute__((cleanup(__cfaehm_cleanup_default)))
274        exception_t * exception = context->current_exception;
275        defaultHandler( exception );
276}
277
278void __cfaehm_throw_terminate( exception_t * val, void (*defaultHandler)(exception_t *) ) {
279        __cfadbg_print_safe(exception, "Throwing termination exception\n");
280
281        __cfaehm_allocate_exception( val );
282        __cfaehm_begin_unwind( defaultHandler );
283}
284
285static __attribute__((noreturn)) void __cfaehm_rethrow_adapter( exception_t * except ) {
286        // TODO: Print some error message.
287        (void)except;
288        abort();
289}
290
291void __cfaehm_rethrow_terminate(void) {
292        __cfadbg_print_safe(exception, "Rethrowing termination exception\n");
293
294        __cfaehm_begin_unwind( __cfaehm_rethrow_adapter );
295        abort();
296}
297
298// This is our personality routine. For every stack frame annotated with
299// ".cfi_personality 0x3,__gcfa_personality_v0" this function will be called twice when unwinding.
300//  Once in the search phase and once in the cleanup phase.
301_Unwind_Reason_Code __gcfa_personality_v0(
302                int version,
303                _Unwind_Action actions,
304                unsigned long long exception_class,
305                struct _Unwind_Exception * unwind_exception,
306                struct _Unwind_Context * unwind_context)
307{
308
309        //__cfadbg_print_safe(exception, "CFA: 0x%lx\n", _Unwind_GetCFA(context));
310        __cfadbg_print_safe(exception, "Personality function (%d, %x, %llu, %p, %p):",
311                        version, actions, exception_class, unwind_exception, unwind_context);
312
313        // Verify that actions follow the rules we expect.
314        // This function should never be called at the end of the stack.
315        verify(!(actions & _UA_END_OF_STACK));
316        // Either only the search phase flag is set or...
317        if (actions & _UA_SEARCH_PHASE) {
318                verify(actions == _UA_SEARCH_PHASE);
319                __cfadbg_print_safe(exception, " lookup phase");
320        // ... we are in clean-up phase.
321        } else {
322                verify(actions & _UA_CLEANUP_PHASE);
323                __cfadbg_print_safe(exception, " cleanup phase");
324                // We shouldn't be the handler frame during forced unwind.
325                if (actions & _UA_HANDLER_FRAME) {
326                        verify(!(actions & _UA_FORCE_UNWIND));
327                        __cfadbg_print_safe(exception, " (handler frame)");
328                } else if (actions & _UA_FORCE_UNWIND) {
329                        __cfadbg_print_safe(exception, " (force unwind)");
330                }
331        }
332
333        // Get a pointer to the language specific data from which we will read what we need
334        const unsigned char * lsd = _Unwind_GetLanguageSpecificData( unwind_context );
335
336        if ( !lsd ) {   //Nothing to do, keep unwinding
337                printf(" no LSD");
338                goto UNWIND;
339        }
340
341        // Get the instuction pointer and a reading pointer into the exception table
342        lsda_header_info lsd_info;
343        const unsigned char * cur_ptr = parse_lsda_header(unwind_context, lsd, &lsd_info);
344        _Unwind_Ptr instruction_ptr = _Unwind_GetIP(unwind_context);
345
346        struct exception_context_t * context = this_exception_context();
347
348        // Linearly search the table for stuff to do
349        while ( cur_ptr < lsd_info.action_table ) {
350                _Unwind_Ptr callsite_start;
351                _Unwind_Ptr callsite_len;
352                _Unwind_Ptr callsite_landing_pad;
353                _uleb128_t  callsite_action;
354
355                // Decode the common stuff we have in here
356                cur_ptr = read_encoded_value(0, lsd_info.call_site_encoding, cur_ptr, &callsite_start);
357                cur_ptr = read_encoded_value(0, lsd_info.call_site_encoding, cur_ptr, &callsite_len);
358                cur_ptr = read_encoded_value(0, lsd_info.call_site_encoding, cur_ptr, &callsite_landing_pad);
359                cur_ptr = read_uleb128(cur_ptr, &callsite_action);
360
361                // Have we reach the correct frame info yet?
362                if ( lsd_info.Start + callsite_start + callsite_len < instruction_ptr ) {
363#ifdef __CFA_DEBUG_PRINT__
364                        void * ls = (void*)lsd_info.Start;
365                        void * cs = (void*)callsite_start;
366                        void * cl = (void*)callsite_len;
367                        void * bp = (void*)lsd_info.Start + callsite_start;
368                        void * ep = (void*)lsd_info.Start + callsite_start + callsite_len;
369                        void * ip = (void*)instruction_ptr;
370                        __cfadbg_print_safe(exception, "\nfound %p - %p (%p, %p, %p), looking for %p\n",
371                                        bp, ep, ls, cs, cl, ip);
372#endif // __CFA_DEBUG_PRINT__
373                        continue;
374                }
375
376                // Have we gone too far?
377                if ( lsd_info.Start + callsite_start > instruction_ptr ) {
378                        printf(" gone too far");
379                        break;
380                }
381
382                // Check for what we must do:
383                if ( 0 == callsite_landing_pad ) {
384                        // Nothing to do, move along
385                        __cfadbg_print_safe(exception, " no landing pad");
386                } else if (actions & _UA_SEARCH_PHASE) {
387                        // In search phase, these means we found a potential handler we must check.
388
389                        // We have arbitrarily decided that 0 means nothing to do and 1 means there is
390                        // a potential handler. This doesn't seem to conflict the gcc default behavior.
391                        if (callsite_action != 0) {
392                                // Now we want to run some code to see if the handler matches
393                                // This is the tricky part where we want to the power to run arbitrary code
394                                // However, generating a new exception table entry and try routine every time
395                                // is way more expansive than we might like
396                                // The information we have is :
397                                //  - The GR (Series of registers)
398                                //    GR1=GP Global Pointer of frame ref by context
399                                //  - The instruction pointer
400                                //  - The instruction pointer info (???)
401                                //  - The CFA (Canonical Frame Address)
402                                //  - The BSP (Probably the base stack pointer)
403
404                                // The current apprach uses one exception table entry per try block
405                                _uleb128_t imatcher;
406                                // Get the relative offset to the {...}?
407                                cur_ptr = read_uleb128(cur_ptr, &imatcher);
408
409#                               if defined( __x86_64 )
410                                _Unwind_Word match_pos = _Unwind_GetCFA(unwind_context) + 8;
411#                               elif defined( __i386 )
412                                _Unwind_Word match_pos = _Unwind_GetCFA(unwind_context) + 24;
413#                               endif
414                                int (*matcher)(exception_t *) = *(int(**)(exception_t *))match_pos;
415
416                                int index = matcher(context->current_exception);
417                                _Unwind_Reason_Code ret = (0 == index)
418                                        ? _URC_CONTINUE_UNWIND : _URC_HANDLER_FOUND;
419                                context->current_handler_index = index;
420
421                                // Based on the return value, check if we matched the exception
422                                if (ret == _URC_HANDLER_FOUND) {
423                                        __cfadbg_print_safe(exception, " handler found\n");
424                                } else {
425                                        __cfadbg_print_safe(exception, " no handler\n");
426                                }
427                                return ret;
428                        }
429
430                        // This is only a cleanup handler, ignore it
431                        __cfadbg_print_safe(exception, " no action");
432                } else {
433                        // In clean-up phase, no destructors here but this could be the handler.
434
435                        if ( (callsite_action != 0) && !(actions & _UA_HANDLER_FRAME) ){
436                                // If this is a potential exception handler
437                                // but not the one that matched the exception in the seach phase,
438                                // just ignore it
439                                goto UNWIND;
440                        }
441
442                        // We need to run some clean-up or a handler
443                        // These statment do the right thing but I don't know any specifics at all
444                        _Unwind_SetGR( unwind_context, __builtin_eh_return_data_regno(0),
445                                (_Unwind_Ptr)unwind_exception );
446                        _Unwind_SetGR( unwind_context, __builtin_eh_return_data_regno(1), 0 );
447
448                        // I assume this sets the instruction pointer to the adress of the landing pad
449                        // It doesn't actually set it, it only state the value that needs to be set once we
450                        // return _URC_INSTALL_CONTEXT
451                        _Unwind_SetIP( unwind_context, ((lsd_info.LPStart) + (callsite_landing_pad)) );
452
453                        __cfadbg_print_safe(exception, " action\n");
454
455                        // Return have some action to run
456                        return _URC_INSTALL_CONTEXT;
457                }
458        }
459        // No handling found
460        __cfadbg_print_safe(exception, " table end reached");
461
462        UNWIND:
463        __cfadbg_print_safe(exception, " unwind\n");
464
465        // Keep unwinding the stack
466        return _URC_CONTINUE_UNWIND;
467}
468
469#pragma GCC push_options
470#pragma GCC optimize(0)
471
472// Try statements are hoisted out see comments for details. While this could probably be unique
473// and simply linked from libcfa but there is one problem left, see the exception table for details
474__attribute__((noinline))
475void __cfaehm_try_terminate(void (*try_block)(),
476                void (*catch_block)(int index, exception_t * except),
477                __attribute__((unused)) int (*match_block)(exception_t * except)) {
478        //! volatile int xy = 0;
479        //! printf("%p %p %p %p\n", &try_block, &catch_block, &match_block, &xy);
480
481        // Setup the personality routine and exception table.
482        // Unforturnately these clobber gcc cancellation support which means we can't get access to
483        // the attribute cleanup tables at the same time. We would have to inspect the assembly to
484        // create a new set ourselves.
485#ifdef __PIC__
486        asm volatile (".cfi_personality 0x9b,CFA.ref.__gcfa_personality_v0");
487        asm volatile (".cfi_lsda 0x1b, .LLSDACFA2");
488#else
489        asm volatile (".cfi_personality 0x3,__gcfa_personality_v0");
490        asm volatile (".cfi_lsda 0x3, .LLSDACFA2");
491#endif
492
493        // Label which defines the start of the area for which the handler is setup.
494        asm volatile (".TRYSTART:");
495
496        // The actual statements of the try blocks
497        try_block();
498
499        // asm statement to prevent deadcode removal
500        asm volatile goto ("" : : : : CATCH );
501
502        // Normal return for when there is no throw.
503        return;
504
505        // Exceptionnal path
506        CATCH : __attribute__(( unused ));
507        // Label which defines the end of the area for which the handler is setup.
508        asm volatile (".TRYEND:");
509        // Label which defines the start of the exception landing pad. Basically what is called when
510        // the exception is caught. Note, if multiple handlers are given, the multiplexing should be
511        // done by the generated code, not the exception runtime.
512        asm volatile (".CATCH:");
513
514        // Exception handler
515        // Note: Saving the exception context on the stack breaks termination exceptions.
516        catch_block( this_exception_context()->current_handler_index,
517                     this_exception_context()->current_exception );
518}
519
520// Exception table data we need to generate. While this is almost generic, the custom data refers
521// to {*}try_terminate, which is no way generic. Some more works need to be done if we want to
522// have a single call to the try routine.
523
524#ifdef __PIC__
525asm (
526        // HEADER
527        ".LFECFA1:\n"
528        "       .globl  __gcfa_personality_v0\n"
529        "       .section        .gcc_except_table,\"a\",@progbits\n"
530        // TABLE HEADER (important field is the BODY length at the end)
531        ".LLSDACFA2:\n"
532        "       .byte   0xff\n"
533        "       .byte   0xff\n"
534        "       .byte   0x1\n"
535        "       .uleb128 .LLSDACSECFA2-.LLSDACSBCFA2\n"
536        // BODY (language specific data)
537        // This uses language specific data and can be modified arbitrarily
538        // We use handled area offset, handled area length,
539        // handler landing pad offset and 1 (action code, gcc seems to use 0).
540        ".LLSDACSBCFA2:\n"
541        "       .uleb128 .TRYSTART-__cfaehm_try_terminate\n"
542        "       .uleb128 .TRYEND-.TRYSTART\n"
543        "       .uleb128 .CATCH-__cfaehm_try_terminate\n"
544        "       .uleb128 1\n"
545        ".LLSDACSECFA2:\n"
546        // TABLE FOOTER
547        "       .text\n"
548        "       .size   __cfaehm_try_terminate, .-__cfaehm_try_terminate\n"
549);
550
551// Somehow this piece of helps with the resolution of debug symbols.
552__attribute__((unused)) static const int dummy = 0;
553
554asm (
555        // Add a hidden symbol which points at the function.
556        "       .hidden CFA.ref.__gcfa_personality_v0\n"
557        "       .weak   CFA.ref.__gcfa_personality_v0\n"
558        // No clue what this does specifically
559        "       .section        .data.rel.local.CFA.ref.__gcfa_personality_v0,\"awG\",@progbits,CFA.ref.__gcfa_personality_v0,comdat\n"
560        "       .align 8\n"
561        "       .type CFA.ref.__gcfa_personality_v0, @object\n"
562        "       .size CFA.ref.__gcfa_personality_v0, 8\n"
563        "CFA.ref.__gcfa_personality_v0:\n"
564#if defined( __x86_64 )
565        "       .quad __gcfa_personality_v0\n"
566#else // then __i386
567        "       .long __gcfa_personality_v0\n"
568#endif
569);
570#else // __PIC__
571asm (
572        // HEADER
573        ".LFECFA1:\n"
574        "       .globl  __gcfa_personality_v0\n"
575        "       .section        .gcc_except_table,\"a\",@progbits\n"
576        // TABLE HEADER (important field is the BODY length at the end)
577        ".LLSDACFA2:\n"
578        "       .byte   0xff\n"
579        "       .byte   0xff\n"
580        "       .byte   0x1\n"
581        "       .uleb128 .LLSDACSECFA2-.LLSDACSBCFA2\n"
582        // BODY (language specific data)
583        ".LLSDACSBCFA2:\n"
584        //      Handled area start (relative to start of function)
585        "       .uleb128 .TRYSTART-__cfaehm_try_terminate\n"
586        //      Handled area length
587        "       .uleb128 .TRYEND-.TRYSTART\n"
588        //      Handler landing pad address (relative to start of function)
589        "       .uleb128 .CATCH-__cfaehm_try_terminate\n"
590        //      Action code, gcc seems to always use 0.
591        "       .uleb128 1\n"
592        // TABLE FOOTER
593        ".LLSDACSECFA2:\n"
594        "       .text\n"
595        "       .size   __cfaehm_try_terminate, .-__cfaehm_try_terminate\n"
596        "       .ident  \"GCC: (Ubuntu 6.2.0-3ubuntu11~16.04) 6.2.0 20160901\"\n"
597        "       .section        .note.GNU-stack,\"x\",@progbits\n"
598);
599#endif // __PIC__
600
601#pragma GCC pop_options
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