source: libcfa/src/exception.c @ 80ec409

arm-ehjacob/cs343-translationnew-astnew-ast-unique-expr
Last change on this file since 80ec409 was 80ec409, checked in by Andrew Beach <ajbeach@…>, 16 months ago

The exception context is now stored on the stack. It is not used just yet.

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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 : Wed Aug 12 13:55:00 2020
13// Update Count     : 21
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 "concurrency/invoke.h"
31#include "stdhdr/assert.h"
32
33// FIX ME: temporary hack to keep ARM build working
34#ifndef _URC_FATAL_PHASE1_ERROR
35#define _URC_FATAL_PHASE1_ERROR 3
36#endif // ! _URC_FATAL_PHASE1_ERROR
37#ifndef _URC_FATAL_PHASE2_ERROR
38#define _URC_FATAL_PHASE2_ERROR 2
39#endif // ! _URC_FATAL_PHASE2_ERROR
40
41#include "lsda.h"
42
43/* The exception class for our exceptions. Because of the vendor component
44 * its value would not be standard.
45 * Vendor: UWPL
46 * Language: CFA\0
47 */
48const _Unwind_Exception_Class __cfaehm_exception_class = 0x4c50575500414643;
49
50// Base exception vtable is abstract, you should not have base exceptions.
51struct __cfaehm_base_exception_t_vtable
52                ___cfaehm_base_exception_t_vtable_instance = {
53        .parent = NULL,
54        .size = 0,
55        .copy = NULL,
56        .free = NULL,
57        .msg = NULL
58};
59
60
61// Temperary global exception context. Does not work with concurency.
62static struct exception_context_t shared_stack = {NULL, NULL};
63
64// Get the current exception context.
65// There can be a single global until multithreading occurs, then each stack
66// needs its own. It will have to be updated to handle that.
67struct exception_context_t * this_exception_context() {
68        return &shared_stack;
69}
70
71
72// RESUMPTION ================================================================
73
74static void reset_top_resume(struct __cfaehm_try_resume_node ** store) {
75        this_exception_context()->top_resume = *store;
76}
77
78void __cfaehm_throw_resume(exception_t * except, void (*defaultHandler)(exception_t *)) {
79        struct exception_context_t * context = this_exception_context();
80
81        __cfadbg_print_safe(exception, "Throwing resumption exception\n");
82
83        {
84                __attribute__((cleanup(reset_top_resume)))
85                struct __cfaehm_try_resume_node * original_head = context->top_resume;
86                struct __cfaehm_try_resume_node * current = context->top_resume;
87
88                for ( ; current ; current = current->next) {
89                        context->top_resume = current->next;
90                        if (current->handler(except)) {
91                                return;
92                        }
93                }
94        } // End the search and return to the top of the stack.
95
96        // No handler found, fall back to the default operation.
97        __cfadbg_print_safe(exception, "Unhandled exception\n");
98        defaultHandler(except);
99}
100
101// Do we control where exceptions get thrown even with concurency?
102// If not these are not quite thread safe, the cleanup hook has to
103// be added after the node is built but before it is made the top node.
104
105void __cfaehm_try_resume_setup(struct __cfaehm_try_resume_node * node,
106                        _Bool (*handler)(exception_t * except)) {
107        struct exception_context_t * context = this_exception_context();
108        node->next = context->top_resume;
109        node->handler = handler;
110        context->top_resume = node;
111}
112
113void __cfaehm_try_resume_cleanup(struct __cfaehm_try_resume_node * node) {
114        struct exception_context_t * context = this_exception_context();
115        context->top_resume = node->next;
116}
117
118
119// MEMORY MANAGEMENT =========================================================
120
121struct __cfaehm_node {
122        struct _Unwind_Exception unwind_exception;
123        struct __cfaehm_node * next;
124        int handler_index;
125};
126
127#define NODE_TO_EXCEPT(node) ((exception_t *)(1 + (node)))
128#define EXCEPT_TO_NODE(except) ((struct __cfaehm_node *)(except) - 1)
129#define UNWIND_TO_NODE(unwind) ((struct __cfaehm_node *)(unwind))
130#define NULL_MAP(map, ptr) ((ptr) ? (map(ptr)) : NULL)
131
132// How to clean up an exception in various situations.
133static void __cfaehm_exception_cleanup(
134                _Unwind_Reason_Code reason,
135                struct _Unwind_Exception * exception) {
136        switch (reason) {
137        case _URC_FOREIGN_EXCEPTION_CAUGHT:
138                // This one we could clean-up to allow cross-language exceptions.
139        case _URC_FATAL_PHASE1_ERROR:
140        case _URC_FATAL_PHASE2_ERROR:
141        default:
142                abort();
143        }
144}
145
146// Creates a copy of the indicated exception and sets current_exception to it.
147static void __cfaehm_allocate_exception( exception_t * except ) {
148        struct exception_context_t * context = this_exception_context();
149
150        // Allocate memory for the exception.
151        struct __cfaehm_node * store = malloc(
152                sizeof( struct __cfaehm_node ) + except->virtual_table->size );
153
154        if ( ! store ) {
155                // Failure: cannot allocate exception. Terminate thread.
156                abort(); // <- Although I think it might be the process.
157        }
158
159        // Initialize the node:
160        exception_t * except_store = NODE_TO_EXCEPT(store);
161        store->unwind_exception.exception_class = __cfaehm_exception_class;
162        store->unwind_exception.exception_cleanup = __cfaehm_exception_cleanup;
163        store->handler_index = 0;
164        except->virtual_table->copy( except_store, except );
165
166        // Add the node to the list:
167        store->next = NULL_MAP(EXCEPT_TO_NODE, context->current_exception);
168        context->current_exception = except_store;
169}
170
171// Delete the provided exception, unsetting current_exception if relivant.
172static void __cfaehm_delete_exception( exception_t * except ) {
173        struct exception_context_t * context = this_exception_context();
174
175        __cfadbg_print_safe(exception, "Deleting Exception\n");
176
177        // Remove the exception from the list.
178        struct __cfaehm_node * to_free = EXCEPT_TO_NODE(except);
179        struct __cfaehm_node * node;
180
181        if ( context->current_exception == except ) {
182                node = to_free->next;
183                context->current_exception = NULL_MAP(NODE_TO_EXCEPT, node);
184        } else {
185                node = EXCEPT_TO_NODE(context->current_exception);
186                // It may always be in the first or second position.
187                while ( to_free != node->next ) {
188                        node = node->next;
189                }
190                node->next = to_free->next;
191        }
192
193        // Free the old exception node.
194        except->virtual_table->free( except );
195        free( to_free );
196}
197
198// CANCELLATION ==============================================================
199
200// Function needed by force unwind
201// It basically says to unwind the whole stack and then exit when we reach the end of the stack
202static _Unwind_Reason_Code _Stop_Fn(
203                int version,
204                _Unwind_Action actions,
205                _Unwind_Exception_Class exception_class,
206                struct _Unwind_Exception * unwind_exception,
207                struct _Unwind_Context * unwind_context,
208                void * stop_param) {
209        // Verify actions follow the rules we expect.
210        verify((actions & _UA_CLEANUP_PHASE) && (actions & _UA_FORCE_UNWIND));
211        verify(!(actions & (_UA_SEARCH_PHASE | _UA_HANDLER_FRAME)));
212
213        if ( actions & _UA_END_OF_STACK ) {
214                exit(1);
215        } else {
216                return _URC_NO_REASON;
217        }
218}
219
220static struct _Unwind_Exception cancel_exception_storage;
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( &cancel_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        if ( NULL == context->current_exception ) {
248                printf("UNWIND ERROR missing exception in begin unwind\n");
249                abort();
250        }
251        struct _Unwind_Exception * storage =
252                &EXCEPT_TO_NODE(context->current_exception)->unwind_exception;
253
254        // Call stdlibc to raise the exception
255        __cfadbg_print_safe(exception, "Begin unwinding (storage &p, context %p)\n", storage, context);
256        _Unwind_Reason_Code ret = _Unwind_RaiseException( storage );
257
258        // If we reach here it means something happened. For resumption to work we need to find a way
259        // to return back to here. Most of them will probably boil down to setting a global flag and
260        // making the phase 1 either stop or fail. Causing an error on purpose may help avoiding
261        // unnecessary work but it might have some weird side effects. If we just pretend no handler
262        // was found that would work but may be expensive for no reason since we will always search
263        // the whole stack.
264
265        // We did not simply reach the end of the stack without finding a handler. This is an error.
266        if ( ret != _URC_END_OF_STACK ) {
267                printf("UNWIND ERROR %d after raise exception\n", ret);
268                abort();
269        }
270
271        // No handler found, go to the default operation.
272        __cfadbg_print_safe(exception, "Uncaught exception %p\n", storage);
273
274        __attribute__((cleanup(__cfaehm_cleanup_default)))
275        exception_t * exception = context->current_exception;
276        defaultHandler( exception );
277}
278
279void __cfaehm_throw_terminate( exception_t * val, void (*defaultHandler)(exception_t *) ) {
280        __cfadbg_print_safe(exception, "Throwing termination exception\n");
281
282        __cfaehm_allocate_exception( val );
283        __cfaehm_begin_unwind( defaultHandler );
284}
285
286static __attribute__((noreturn)) void __cfaehm_rethrow_adapter( exception_t * except ) {
287        // TODO: Print some error message.
288        (void)except;
289        abort();
290}
291
292void __cfaehm_rethrow_terminate(void) {
293        __cfadbg_print_safe(exception, "Rethrowing termination exception\n");
294
295        __cfaehm_begin_unwind( __cfaehm_rethrow_adapter );
296        abort();
297}
298
299// This is our personality routine. For every stack frame annotated with
300// ".cfi_personality 0x3,__gcfa_personality_v0" this function will be called twice when unwinding.
301//  Once in the search phase and once in the cleanup phase.
302_Unwind_Reason_Code __gcfa_personality_v0(
303                int version,
304                _Unwind_Action actions,
305                unsigned long long exception_class,
306                struct _Unwind_Exception * unwind_exception,
307                struct _Unwind_Context * unwind_context)
308{
309
310        //__cfadbg_print_safe(exception, "CFA: 0x%lx\n", _Unwind_GetCFA(context));
311        __cfadbg_print_safe(exception, "Personality function (%d, %x, %llu, %p, %p):",
312                        version, actions, exception_class, unwind_exception, unwind_context);
313
314        // Verify that actions follow the rules we expect.
315        // This function should never be called at the end of the stack.
316        verify(!(actions & _UA_END_OF_STACK));
317        // Either only the search phase flag is set or...
318        if (actions & _UA_SEARCH_PHASE) {
319                verify(actions == _UA_SEARCH_PHASE);
320                __cfadbg_print_safe(exception, " lookup phase");
321        // ... we are in clean-up phase.
322        } else {
323                verify(actions & _UA_CLEANUP_PHASE);
324                __cfadbg_print_safe(exception, " cleanup phase");
325                // We shouldn't be the handler frame during forced unwind.
326                if (actions & _UA_HANDLER_FRAME) {
327                        verify(!(actions & _UA_FORCE_UNWIND));
328                        __cfadbg_print_safe(exception, " (handler frame)");
329                } else if (actions & _UA_FORCE_UNWIND) {
330                        __cfadbg_print_safe(exception, " (force unwind)");
331                }
332        }
333
334        // Get a pointer to the language specific data from which we will read what we need
335        const unsigned char * lsd = _Unwind_GetLanguageSpecificData( unwind_context );
336
337        if ( !lsd ) {   //Nothing to do, keep unwinding
338                printf(" no LSD");
339                goto UNWIND;
340        }
341
342        // Get the instuction pointer and a reading pointer into the exception table
343        lsda_header_info lsd_info;
344        const unsigned char * cur_ptr = parse_lsda_header(unwind_context, lsd, &lsd_info);
345        _Unwind_Ptr instruction_ptr = _Unwind_GetIP(unwind_context);
346
347        struct exception_context_t * context = this_exception_context();
348
349        // Linearly search the table for stuff to do
350        while ( cur_ptr < lsd_info.action_table ) {
351                _Unwind_Ptr callsite_start;
352                _Unwind_Ptr callsite_len;
353                _Unwind_Ptr callsite_landing_pad;
354                _uleb128_t  callsite_action;
355
356                // Decode the common stuff we have in here
357                cur_ptr = read_encoded_value(0, lsd_info.call_site_encoding, cur_ptr, &callsite_start);
358                cur_ptr = read_encoded_value(0, lsd_info.call_site_encoding, cur_ptr, &callsite_len);
359                cur_ptr = read_encoded_value(0, lsd_info.call_site_encoding, cur_ptr, &callsite_landing_pad);
360                cur_ptr = read_uleb128(cur_ptr, &callsite_action);
361
362                // Have we reach the correct frame info yet?
363                if ( lsd_info.Start + callsite_start + callsite_len < instruction_ptr ) {
364#ifdef __CFA_DEBUG_PRINT__
365                        void * ls = (void*)lsd_info.Start;
366                        void * cs = (void*)callsite_start;
367                        void * cl = (void*)callsite_len;
368                        void * bp = (void*)lsd_info.Start + callsite_start;
369                        void * ep = (void*)lsd_info.Start + callsite_start + callsite_len;
370                        void * ip = (void*)instruction_ptr;
371                        __cfadbg_print_safe(exception, "\nfound %p - %p (%p, %p, %p), looking for %p\n",
372                                        bp, ep, ls, cs, cl, ip);
373#endif // __CFA_DEBUG_PRINT__
374                        continue;
375                }
376
377                // Have we gone too far?
378                if ( lsd_info.Start + callsite_start > instruction_ptr ) {
379                        printf(" gone too far");
380                        break;
381                }
382
383                // Check for what we must do:
384                if ( 0 == callsite_landing_pad ) {
385                        // Nothing to do, move along
386                        __cfadbg_print_safe(exception, " no landing pad");
387                } else if (actions & _UA_SEARCH_PHASE) {
388                        // In search phase, these means we found a potential handler we must check.
389
390                        // We have arbitrarily decided that 0 means nothing to do and 1 means there is
391                        // a potential handler. This doesn't seem to conflict the gcc default behavior.
392                        if (callsite_action != 0) {
393                                // Now we want to run some code to see if the handler matches
394                                // This is the tricky part where we want to the power to run arbitrary code
395                                // However, generating a new exception table entry and try routine every time
396                                // is way more expansive than we might like
397                                // The information we have is :
398                                //  - The GR (Series of registers)
399                                //    GR1=GP Global Pointer of frame ref by context
400                                //  - The instruction pointer
401                                //  - The instruction pointer info (???)
402                                //  - The CFA (Canonical Frame Address)
403                                //  - The BSP (Probably the base stack pointer)
404
405                                // The current apprach uses one exception table entry per try block
406                                _uleb128_t imatcher;
407                                // Get the relative offset to the {...}?
408                                cur_ptr = read_uleb128(cur_ptr, &imatcher);
409
410#                               if defined( __x86_64 )
411                                _Unwind_Word match_pos = _Unwind_GetCFA(unwind_context) + 8;
412#                               elif defined( __i386 )
413                                _Unwind_Word match_pos = _Unwind_GetCFA(unwind_context) + 24;
414#                               endif
415                                int (*matcher)(exception_t *) = *(int(**)(exception_t *))match_pos;
416
417                                int index = matcher(context->current_exception);
418                                _Unwind_Reason_Code ret = (0 == index)
419                                        ? _URC_CONTINUE_UNWIND : _URC_HANDLER_FOUND;
420                                UNWIND_TO_NODE(unwind_exception)->handler_index = index;
421
422                                // Based on the return value, check if we matched the exception
423                                if (ret == _URC_HANDLER_FOUND) {
424                                        __cfadbg_print_safe(exception, " handler found\n");
425                                } else {
426                                        // TODO: Continue the search if there is more in the table.
427                                        __cfadbg_print_safe(exception, " no handler\n");
428                                }
429                                return ret;
430                        }
431
432                        // This is only a cleanup handler, ignore it
433                        __cfadbg_print_safe(exception, " no action");
434                } else {
435                        // In clean-up phase, no destructors here but this could be the handler.
436
437                        if ( (callsite_action != 0) && !(actions & _UA_HANDLER_FRAME) ){
438                                // If this is a potential exception handler
439                                // but not the one that matched the exception in the seach phase,
440                                // just ignore it
441                                goto UNWIND;
442                        }
443
444                        // We need to run some clean-up or a handler
445                        // These statment do the right thing but I don't know any specifics at all
446                        _Unwind_SetGR( unwind_context, __builtin_eh_return_data_regno(0),
447                                (_Unwind_Ptr)unwind_exception );
448                        _Unwind_SetGR( unwind_context, __builtin_eh_return_data_regno(1), 0 );
449
450                        // I assume this sets the instruction pointer to the adress of the landing pad
451                        // It doesn't actually set it, it only state the value that needs to be set once we
452                        // return _URC_INSTALL_CONTEXT
453                        _Unwind_SetIP( unwind_context, ((lsd_info.LPStart) + (callsite_landing_pad)) );
454
455                        __cfadbg_print_safe(exception, " action\n");
456
457                        // Return have some action to run
458                        return _URC_INSTALL_CONTEXT;
459                }
460        }
461        // No handling found
462        __cfadbg_print_safe(exception, " table end reached");
463
464        UNWIND:
465        __cfadbg_print_safe(exception, " unwind\n");
466
467        // Keep unwinding the stack
468        return _URC_CONTINUE_UNWIND;
469}
470
471#pragma GCC push_options
472#pragma GCC optimize(0)
473
474// Try statements are hoisted out see comments for details. While this could probably be unique
475// and simply linked from libcfa but there is one problem left, see the exception table for details
476__attribute__((noinline))
477void __cfaehm_try_terminate(void (*try_block)(),
478                void (*catch_block)(int index, exception_t * except),
479                __attribute__((unused)) int (*match_block)(exception_t * except)) {
480        //! volatile int xy = 0;
481        //! printf("%p %p %p %p\n", &try_block, &catch_block, &match_block, &xy);
482
483        // Setup the personality routine and exception table.
484        // Unforturnately these clobber gcc cancellation support which means we can't get access to
485        // the attribute cleanup tables at the same time. We would have to inspect the assembly to
486        // create a new set ourselves.
487#ifdef __PIC__
488        asm volatile (".cfi_personality 0x9b,CFA.ref.__gcfa_personality_v0");
489        asm volatile (".cfi_lsda 0x1b, .LLSDACFA2");
490#else
491        asm volatile (".cfi_personality 0x3,__gcfa_personality_v0");
492        asm volatile (".cfi_lsda 0x3, .LLSDACFA2");
493#endif
494
495        // Label which defines the start of the area for which the handler is setup.
496        asm volatile (".TRYSTART:");
497
498        // The actual statements of the try blocks
499        try_block();
500
501        // asm statement to prevent deadcode removal
502        asm volatile goto ("" : : : : CATCH );
503
504        // Normal return for when there is no throw.
505        return;
506
507        // Exceptionnal path
508        CATCH : __attribute__(( unused ));
509        // Label which defines the end of the area for which the handler is setup.
510        asm volatile (".TRYEND:");
511        // Label which defines the start of the exception landing pad. Basically what is called when
512        // the exception is caught. Note, if multiple handlers are given, the multiplexing should be
513        // done by the generated code, not the exception runtime.
514        asm volatile (".CATCH:");
515
516        // Exception handler
517        // Note: Saving the exception context on the stack breaks termination exceptions.
518        catch_block( EXCEPT_TO_NODE( this_exception_context()->current_exception )->handler_index,
519                     this_exception_context()->current_exception );
520}
521
522// Exception table data we need to generate. While this is almost generic, the custom data refers
523// to {*}try_terminate, which is no way generic. Some more works need to be done if we want to
524// have a single call to the try routine.
525
526#ifdef __PIC__
527asm (
528        // HEADER
529        ".LFECFA1:\n"
530        "       .globl  __gcfa_personality_v0\n"
531        "       .section        .gcc_except_table,\"a\",@progbits\n"
532        // TABLE HEADER (important field is the BODY length at the end)
533        ".LLSDACFA2:\n"
534        "       .byte   0xff\n"
535        "       .byte   0xff\n"
536        "       .byte   0x1\n"
537        "       .uleb128 .LLSDACSECFA2-.LLSDACSBCFA2\n"
538        // BODY (language specific data)
539        // This uses language specific data and can be modified arbitrarily
540        // We use handled area offset, handled area length,
541        // handler landing pad offset and 1 (action code, gcc seems to use 0).
542        ".LLSDACSBCFA2:\n"
543        "       .uleb128 .TRYSTART-__cfaehm_try_terminate\n"
544        "       .uleb128 .TRYEND-.TRYSTART\n"
545        "       .uleb128 .CATCH-__cfaehm_try_terminate\n"
546        "       .uleb128 1\n"
547        ".LLSDACSECFA2:\n"
548        // TABLE FOOTER
549        "       .text\n"
550        "       .size   __cfaehm_try_terminate, .-__cfaehm_try_terminate\n"
551);
552
553// Somehow this piece of helps with the resolution of debug symbols.
554__attribute__((unused)) static const int dummy = 0;
555
556asm (
557        // Add a hidden symbol which points at the function.
558        "       .hidden CFA.ref.__gcfa_personality_v0\n"
559        "       .weak   CFA.ref.__gcfa_personality_v0\n"
560        // No clue what this does specifically
561        "       .section        .data.rel.local.CFA.ref.__gcfa_personality_v0,\"awG\",@progbits,CFA.ref.__gcfa_personality_v0,comdat\n"
562        "       .align 8\n"
563        "       .type CFA.ref.__gcfa_personality_v0, @object\n"
564        "       .size CFA.ref.__gcfa_personality_v0, 8\n"
565        "CFA.ref.__gcfa_personality_v0:\n"
566#if defined( __x86_64 )
567        "       .quad __gcfa_personality_v0\n"
568#else // then __i386
569        "       .long __gcfa_personality_v0\n"
570#endif
571);
572#else // __PIC__
573asm (
574        // HEADER
575        ".LFECFA1:\n"
576        "       .globl  __gcfa_personality_v0\n"
577        "       .section        .gcc_except_table,\"a\",@progbits\n"
578        // TABLE HEADER (important field is the BODY length at the end)
579        ".LLSDACFA2:\n"
580        "       .byte   0xff\n"
581        "       .byte   0xff\n"
582        "       .byte   0x1\n"
583        "       .uleb128 .LLSDACSECFA2-.LLSDACSBCFA2\n"
584        // BODY (language specific data)
585        ".LLSDACSBCFA2:\n"
586        //      Handled area start (relative to start of function)
587        "       .uleb128 .TRYSTART-__cfaehm_try_terminate\n"
588        //      Handled area length
589        "       .uleb128 .TRYEND-.TRYSTART\n"
590        //      Handler landing pad address (relative to start of function)
591        "       .uleb128 .CATCH-__cfaehm_try_terminate\n"
592        //      Action code, gcc seems to always use 0.
593        "       .uleb128 1\n"
594        // TABLE FOOTER
595        ".LLSDACSECFA2:\n"
596        "       .text\n"
597        "       .size   __cfaehm_try_terminate, .-__cfaehm_try_terminate\n"
598        "       .ident  \"GCC: (Ubuntu 6.2.0-3ubuntu11~16.04) 6.2.0 20160901\"\n"
599        "       .section        .note.GNU-stack,\"x\",@progbits\n"
600);
601#endif // __PIC__
602
603#pragma GCC pop_options
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