source: libcfa/src/exception.c @ 980fb4e

ADTarm-ehast-experimentalenumforall-pointer-decayjacob/cs343-translationnew-astnew-ast-unique-exprpthread-emulationqualifiedEnum
Last change on this file since 980fb4e was 980fb4e, checked in by Andrew Beach <ajbeach@…>, 4 years ago

Added a test for exceptions and made a patch to allow it to pass.

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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 "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} static shared_stack = {NULL, NULL};
66
67// Get the current exception context.
68// There can be a single global until multithreading occurs, then each stack
69// needs its own. It will have to be updated to handle that.
70struct exception_context_t * this_exception_context() {
71        return &shared_stack;
72}
73
74
75// RESUMPTION ================================================================
76
77static void reset_top_resume(struct __cfaehm_try_resume_node ** store) {
78        this_exception_context()->top_resume = *store;
79}
80
81void __cfaehm_throw_resume(exception_t * except, void (*defaultHandler)(exception_t *)) {
82        struct exception_context_t * context = this_exception_context();
83
84        __cfadbg_print_safe(exception, "Throwing resumption exception\n");
85
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        } // End the search and return to the top of the stack.
98
99        // No handler found, fall back to the default operation.
100        __cfadbg_print_safe(exception, "Unhandled exception\n");
101        defaultHandler(except);
102}
103
104// Do we control where exceptions get thrown even with concurency?
105// If not these are not quite thread safe, the cleanup hook has to
106// be added after the node is built but before it is made the top node.
107
108void __cfaehm_try_resume_setup(struct __cfaehm_try_resume_node * node,
109                        _Bool (*handler)(exception_t * except)) {
110        struct exception_context_t * context = this_exception_context();
111        node->next = context->top_resume;
112        node->handler = handler;
113        context->top_resume = node;
114}
115
116void __cfaehm_try_resume_cleanup(struct __cfaehm_try_resume_node * node) {
117        struct exception_context_t * context = this_exception_context();
118        context->top_resume = node->next;
119}
120
121
122// MEMORY MANAGEMENT =========================================================
123
124struct __cfaehm_node {
125        struct _Unwind_Exception unwind_exception;
126        struct __cfaehm_node * next;
127        int handler_index;
128};
129
130#define NODE_TO_EXCEPT(node) ((exception_t *)(1 + (node)))
131#define EXCEPT_TO_NODE(except) ((struct __cfaehm_node *)(except) - 1)
132#define UNWIND_TO_NODE(unwind) ((struct __cfaehm_node *)(unwind))
133#define NULL_MAP(map, ptr) ((ptr) ? (map(ptr)) : NULL)
134
135// How to clean up an exception in various situations.
136static void __cfaehm_exception_cleanup(
137                _Unwind_Reason_Code reason,
138                struct _Unwind_Exception * exception) {
139        switch (reason) {
140        case _URC_FOREIGN_EXCEPTION_CAUGHT:
141                // This one we could clean-up to allow cross-language exceptions.
142        case _URC_FATAL_PHASE1_ERROR:
143        case _URC_FATAL_PHASE2_ERROR:
144        default:
145                abort();
146        }
147}
148
149// Creates a copy of the indicated exception and sets current_exception to it.
150static void __cfaehm_allocate_exception( exception_t * except ) {
151        struct exception_context_t * context = this_exception_context();
152
153        // Allocate memory for the exception.
154        struct __cfaehm_node * store = malloc(
155                sizeof( struct __cfaehm_node ) + except->virtual_table->size );
156
157        if ( ! store ) {
158                // Failure: cannot allocate exception. Terminate thread.
159                abort(); // <- Although I think it might be the process.
160        }
161
162        // Initialize the node:
163        exception_t * except_store = NODE_TO_EXCEPT(store);
164        store->unwind_exception.exception_class = __cfaehm_exception_class;
165        store->unwind_exception.exception_cleanup = __cfaehm_exception_cleanup;
166        store->handler_index = 0;
167        except->virtual_table->copy( except_store, except );
168
169        // Add the node to the list:
170        store->next = NULL_MAP(EXCEPT_TO_NODE, context->current_exception);
171        context->current_exception = except_store;
172}
173
174// Delete the provided exception, unsetting current_exception if relivant.
175static void __cfaehm_delete_exception( exception_t * except ) {
176        struct exception_context_t * context = this_exception_context();
177
178        __cfadbg_print_safe(exception, "Deleting Exception\n");
179
180        // Remove the exception from the list.
181        struct __cfaehm_node * to_free = EXCEPT_TO_NODE(except);
182        struct __cfaehm_node * node;
183
184        if ( context->current_exception == except ) {
185                node = to_free->next;
186                context->current_exception = NULL_MAP(NODE_TO_EXCEPT, node);
187        } else {
188                node = EXCEPT_TO_NODE(context->current_exception);
189                // It may always be in the first or second position.
190                while ( to_free != node->next ) {
191                        node = node->next;
192                }
193                node->next = to_free->next;
194        }
195
196        // Free the old exception node.
197        except->virtual_table->free( except );
198        free( to_free );
199}
200
201// CANCELLATION ==============================================================
202
203// Function needed by force unwind
204// It basically says to unwind the whole stack and then exit when we reach the end of the stack
205static _Unwind_Reason_Code _Stop_Fn(
206                int version,
207                _Unwind_Action actions,
208                _Unwind_Exception_Class exception_class,
209                struct _Unwind_Exception * unwind_exception,
210                struct _Unwind_Context * unwind_context,
211                void * stop_param) {
212        // Verify actions follow the rules we expect.
213        verify((actions & _UA_CLEANUP_PHASE) && (actions & _UA_FORCE_UNWIND));
214        verify(!(actions & (_UA_SEARCH_PHASE | _UA_HANDLER_FRAME)));
215
216        if ( actions & _UA_END_OF_STACK ) {
217                exit(1);
218        } else {
219                return _URC_NO_REASON;
220        }
221}
222
223static struct _Unwind_Exception cancel_exception_storage;
224
225// Cancel the current stack, prefroming approprate clean-up and messaging.
226void __cfaehm_cancel_stack( exception_t * exception ) {
227        // TODO: Detect current stack and pick a particular stop-function.
228        _Unwind_Reason_Code ret;
229        ret = _Unwind_ForcedUnwind( &cancel_exception_storage, _Stop_Fn, (void*)0x22 );
230        printf("UNWIND ERROR %d after force unwind\n", ret);
231        abort();
232}
233
234
235// TERMINATION ===============================================================
236
237// If this isn't a rethrow (*except==0), delete the provided exception.
238void __cfaehm_cleanup_terminate( void * except ) {
239        if ( *(void**)except ) __cfaehm_delete_exception( *(exception_t **)except );
240}
241
242static void __cfaehm_cleanup_default( exception_t ** except ) {
243        __cfaehm_delete_exception( *except );
244        *except = NULL;
245}
246
247// The exception that is being thrown must already be stored.
248static void __cfaehm_begin_unwind(void(*defaultHandler)(exception_t *)) {
249        struct exception_context_t * context = this_exception_context();
250        if ( NULL == context->current_exception ) {
251                printf("UNWIND ERROR missing exception in begin unwind\n");
252                abort();
253        }
254        struct _Unwind_Exception * storage =
255                &EXCEPT_TO_NODE(context->current_exception)->unwind_exception;
256
257        // Call stdlibc to raise the exception
258        __cfadbg_print_safe(exception, "Begin unwinding (storage &p, context %p)\n", storage, context);
259        _Unwind_Reason_Code ret = _Unwind_RaiseException( storage );
260
261        // If we reach here it means something happened. For resumption to work we need to find a way
262        // to return back to here. Most of them will probably boil down to setting a global flag and
263        // making the phase 1 either stop or fail. Causing an error on purpose may help avoiding
264        // unnecessary work but it might have some weird side effects. If we just pretend no handler
265        // was found that would work but may be expensive for no reason since we will always search
266        // the whole stack.
267
268        // We did not simply reach the end of the stack without finding a handler. This is an error.
269        if ( ret != _URC_END_OF_STACK ) {
270                printf("UNWIND ERROR %d after raise exception\n", ret);
271                abort();
272        }
273
274        // No handler found, go to the default operation.
275        __cfadbg_print_safe(exception, "Uncaught exception %p\n", storage);
276
277        __attribute__((cleanup(__cfaehm_cleanup_default)))
278        exception_t * exception = context->current_exception;
279        defaultHandler( exception );
280}
281
282void __cfaehm_throw_terminate( exception_t * val, void (*defaultHandler)(exception_t *) ) {
283        __cfadbg_print_safe(exception, "Throwing termination exception\n");
284
285        __cfaehm_allocate_exception( val );
286        __cfaehm_begin_unwind( defaultHandler );
287}
288
289static __attribute__((noreturn)) void __cfaehm_rethrow_adapter( exception_t * except ) {
290        // TODO: Print some error message.
291        (void)except;
292        abort();
293}
294
295void __cfaehm_rethrow_terminate(void) {
296        __cfadbg_print_safe(exception, "Rethrowing termination exception\n");
297
298        __cfaehm_begin_unwind( __cfaehm_rethrow_adapter );
299        abort();
300}
301
302// This is our personality routine. For every stack frame annotated with
303// ".cfi_personality 0x3,__gcfa_personality_v0" this function will be called twice when unwinding.
304//  Once in the search phase and once in the cleanup phase.
305_Unwind_Reason_Code __gcfa_personality_v0(
306                int version,
307                _Unwind_Action actions,
308                unsigned long long exception_class,
309                struct _Unwind_Exception * unwind_exception,
310                struct _Unwind_Context * unwind_context)
311{
312
313        //__cfadbg_print_safe(exception, "CFA: 0x%lx\n", _Unwind_GetCFA(context));
314        __cfadbg_print_safe(exception, "Personality function (%d, %x, %llu, %p, %p):",
315                        version, actions, exception_class, unwind_exception, unwind_context);
316
317        // Verify that actions follow the rules we expect.
318        // This function should never be called at the end of the stack.
319        verify(!(actions & _UA_END_OF_STACK));
320        // Either only the search phase flag is set or...
321        if (actions & _UA_SEARCH_PHASE) {
322                verify(actions == _UA_SEARCH_PHASE);
323                __cfadbg_print_safe(exception, " lookup phase");
324        // ... we are in clean-up phase.
325        } else {
326                verify(actions & _UA_CLEANUP_PHASE);
327                __cfadbg_print_safe(exception, " cleanup phase");
328                // We shouldn't be the handler frame during forced unwind.
329                if (actions & _UA_HANDLER_FRAME) {
330                        verify(!(actions & _UA_FORCE_UNWIND));
331                        __cfadbg_print_safe(exception, " (handler frame)");
332                } else if (actions & _UA_FORCE_UNWIND) {
333                        __cfadbg_print_safe(exception, " (force unwind)");
334                }
335        }
336
337        // Get a pointer to the language specific data from which we will read what we need
338        const unsigned char * lsd = _Unwind_GetLanguageSpecificData( unwind_context );
339
340        if ( !lsd ) {   //Nothing to do, keep unwinding
341                printf(" no LSD");
342                goto UNWIND;
343        }
344
345        // Get the instuction pointer and a reading pointer into the exception table
346        lsda_header_info lsd_info;
347        const unsigned char * cur_ptr = parse_lsda_header(unwind_context, lsd, &lsd_info);
348        _Unwind_Ptr instruction_ptr = _Unwind_GetIP(unwind_context);
349
350        struct exception_context_t * context = this_exception_context();
351
352        // Linearly search the table for stuff to do
353        while ( cur_ptr < lsd_info.action_table ) {
354                _Unwind_Ptr callsite_start;
355                _Unwind_Ptr callsite_len;
356                _Unwind_Ptr callsite_landing_pad;
357                _uleb128_t  callsite_action;
358
359                // Decode the common stuff we have in here
360                cur_ptr = read_encoded_value(0, lsd_info.call_site_encoding, cur_ptr, &callsite_start);
361                cur_ptr = read_encoded_value(0, lsd_info.call_site_encoding, cur_ptr, &callsite_len);
362                cur_ptr = read_encoded_value(0, lsd_info.call_site_encoding, cur_ptr, &callsite_landing_pad);
363                cur_ptr = read_uleb128(cur_ptr, &callsite_action);
364
365                // Have we reach the correct frame info yet?
366                if ( lsd_info.Start + callsite_start + callsite_len < instruction_ptr ) {
367#ifdef __CFA_DEBUG_PRINT__
368                        void * ls = (void*)lsd_info.Start;
369                        void * cs = (void*)callsite_start;
370                        void * cl = (void*)callsite_len;
371                        void * bp = (void*)lsd_info.Start + callsite_start;
372                        void * ep = (void*)lsd_info.Start + callsite_start + callsite_len;
373                        void * ip = (void*)instruction_ptr;
374                        __cfadbg_print_safe(exception, "\nfound %p - %p (%p, %p, %p), looking for %p\n",
375                                        bp, ep, ls, cs, cl, ip);
376#endif // __CFA_DEBUG_PRINT__
377                        continue;
378                }
379
380                // Have we gone too far?
381                if ( lsd_info.Start + callsite_start > instruction_ptr ) {
382                        printf(" gone too far");
383                        break;
384                }
385
386                // Check for what we must do:
387                if ( 0 == callsite_landing_pad ) {
388                        // Nothing to do, move along
389                        __cfadbg_print_safe(exception, " no landing pad");
390                } else if (actions & _UA_SEARCH_PHASE) {
391                        // In search phase, these means we found a potential handler we must check.
392
393                        // We have arbitrarily decided that 0 means nothing to do and 1 means there is
394                        // a potential handler. This doesn't seem to conflict the gcc default behavior.
395                        if (callsite_action != 0) {
396                                // Now we want to run some code to see if the handler matches
397                                // This is the tricky part where we want to the power to run arbitrary code
398                                // However, generating a new exception table entry and try routine every time
399                                // is way more expansive than we might like
400                                // The information we have is :
401                                //  - The GR (Series of registers)
402                                //    GR1=GP Global Pointer of frame ref by context
403                                //  - The instruction pointer
404                                //  - The instruction pointer info (???)
405                                //  - The CFA (Canonical Frame Address)
406                                //  - The BSP (Probably the base stack pointer)
407
408                                // The current apprach uses one exception table entry per try block
409                                _uleb128_t imatcher;
410                                // Get the relative offset to the {...}?
411                                cur_ptr = read_uleb128(cur_ptr, &imatcher);
412
413#                               if defined( __x86_64 )
414                                _Unwind_Word match_pos = _Unwind_GetCFA(unwind_context) + 8;
415#                               elif defined( __i386 )
416                                _Unwind_Word match_pos = _Unwind_GetCFA(unwind_context) + 24;
417#                               endif
418                                int (*matcher)(exception_t *) = *(int(**)(exception_t *))match_pos;
419
420                                int index = matcher(context->current_exception);
421                                _Unwind_Reason_Code ret = (0 == index)
422                                        ? _URC_CONTINUE_UNWIND : _URC_HANDLER_FOUND;
423                                UNWIND_TO_NODE(unwind_exception)->handler_index = index;
424
425                                // Based on the return value, check if we matched the exception
426                                if (ret == _URC_HANDLER_FOUND) {
427                                        __cfadbg_print_safe(exception, " handler found\n");
428                                } else {
429                                        // TODO: Continue the search if there is more in the table.
430                                        __cfadbg_print_safe(exception, " no handler\n");
431                                }
432                                return ret;
433                        }
434
435                        // This is only a cleanup handler, ignore it
436                        __cfadbg_print_safe(exception, " no action");
437                } else {
438                        // In clean-up phase, no destructors here but this could be the handler.
439
440                        if ( (callsite_action != 0) && !(actions & _UA_HANDLER_FRAME) ){
441                                // If this is a potential exception handler
442                                // but not the one that matched the exception in the seach phase,
443                                // just ignore it
444                                goto UNWIND;
445                        }
446
447                        // We need to run some clean-up or a handler
448                        // These statment do the right thing but I don't know any specifics at all
449                        _Unwind_SetGR( unwind_context, __builtin_eh_return_data_regno(0),
450                                (_Unwind_Ptr)unwind_exception );
451                        _Unwind_SetGR( unwind_context, __builtin_eh_return_data_regno(1), 0 );
452
453                        // I assume this sets the instruction pointer to the adress of the landing pad
454                        // It doesn't actually set it, it only state the value that needs to be set once we
455                        // return _URC_INSTALL_CONTEXT
456                        _Unwind_SetIP( unwind_context, ((lsd_info.LPStart) + (callsite_landing_pad)) );
457
458                        __cfadbg_print_safe(exception, " action\n");
459
460                        // Return have some action to run
461                        return _URC_INSTALL_CONTEXT;
462                }
463        }
464        // No handling found
465        __cfadbg_print_safe(exception, " table end reached");
466
467        UNWIND:
468        __cfadbg_print_safe(exception, " unwind\n");
469
470        // Keep unwinding the stack
471        return _URC_CONTINUE_UNWIND;
472}
473
474#pragma GCC push_options
475#pragma GCC optimize(0)
476
477// Try statements are hoisted out see comments for details. While this could probably be unique
478// and simply linked from libcfa but there is one problem left, see the exception table for details
479__attribute__((noinline))
480void __cfaehm_try_terminate(void (*try_block)(),
481                void (*catch_block)(int index, exception_t * except),
482                __attribute__((unused)) int (*match_block)(exception_t * except)) {
483        //! volatile int xy = 0;
484        //! printf("%p %p %p %p\n", &try_block, &catch_block, &match_block, &xy);
485
486        // Setup the personality routine and exception table.
487        // Unforturnately these clobber gcc cancellation support which means we can't get access to
488        // the attribute cleanup tables at the same time. We would have to inspect the assembly to
489        // create a new set ourselves.
490#ifdef __PIC__
491        asm volatile (".cfi_personality 0x9b,CFA.ref.__gcfa_personality_v0");
492        asm volatile (".cfi_lsda 0x1b, .LLSDACFA2");
493#else
494        asm volatile (".cfi_personality 0x3,__gcfa_personality_v0");
495        asm volatile (".cfi_lsda 0x3, .LLSDACFA2");
496#endif
497
498        // Label which defines the start of the area for which the handler is setup.
499        asm volatile (".TRYSTART:");
500
501        // The actual statements of the try blocks
502        try_block();
503
504        // asm statement to prevent deadcode removal
505        asm volatile goto ("" : : : : CATCH );
506
507        // Normal return for when there is no throw.
508        return;
509
510        // Exceptionnal path
511        CATCH : __attribute__(( unused ));
512        // Label which defines the end of the area for which the handler is setup.
513        asm volatile (".TRYEND:");
514        // Label which defines the start of the exception landing pad. Basically what is called when
515        // the exception is caught. Note, if multiple handlers are given, the multiplexing should be
516        // done by the generated code, not the exception runtime.
517        asm volatile (".CATCH:");
518
519        // Exception handler
520        // Note: Saving the exception context on the stack breaks termination exceptions.
521        catch_block( EXCEPT_TO_NODE( this_exception_context()->current_exception )->handler_index,
522                     this_exception_context()->current_exception );
523}
524
525// Exception table data we need to generate. While this is almost generic, the custom data refers
526// to {*}try_terminate, which is no way generic. Some more works need to be done if we want to
527// have a single call to the try routine.
528
529#ifdef __PIC__
530asm (
531        // HEADER
532        ".LFECFA1:\n"
533        "       .globl  __gcfa_personality_v0\n"
534        "       .section        .gcc_except_table,\"a\",@progbits\n"
535        // TABLE HEADER (important field is the BODY length at the end)
536        ".LLSDACFA2:\n"
537        "       .byte   0xff\n"
538        "       .byte   0xff\n"
539        "       .byte   0x1\n"
540        "       .uleb128 .LLSDACSECFA2-.LLSDACSBCFA2\n"
541        // BODY (language specific data)
542        // This uses language specific data and can be modified arbitrarily
543        // We use handled area offset, handled area length,
544        // handler landing pad offset and 1 (action code, gcc seems to use 0).
545        ".LLSDACSBCFA2:\n"
546        "       .uleb128 .TRYSTART-__cfaehm_try_terminate\n"
547        "       .uleb128 .TRYEND-.TRYSTART\n"
548        "       .uleb128 .CATCH-__cfaehm_try_terminate\n"
549        "       .uleb128 1\n"
550        ".LLSDACSECFA2:\n"
551        // TABLE FOOTER
552        "       .text\n"
553        "       .size   __cfaehm_try_terminate, .-__cfaehm_try_terminate\n"
554);
555
556// Somehow this piece of helps with the resolution of debug symbols.
557__attribute__((unused)) static const int dummy = 0;
558
559asm (
560        // Add a hidden symbol which points at the function.
561        "       .hidden CFA.ref.__gcfa_personality_v0\n"
562        "       .weak   CFA.ref.__gcfa_personality_v0\n"
563        // No clue what this does specifically
564        "       .section        .data.rel.local.CFA.ref.__gcfa_personality_v0,\"awG\",@progbits,CFA.ref.__gcfa_personality_v0,comdat\n"
565        "       .align 8\n"
566        "       .type CFA.ref.__gcfa_personality_v0, @object\n"
567        "       .size CFA.ref.__gcfa_personality_v0, 8\n"
568        "CFA.ref.__gcfa_personality_v0:\n"
569#if defined( __x86_64 )
570        "       .quad __gcfa_personality_v0\n"
571#else // then __i386
572        "       .long __gcfa_personality_v0\n"
573#endif
574);
575#else // __PIC__
576asm (
577        // HEADER
578        ".LFECFA1:\n"
579        "       .globl  __gcfa_personality_v0\n"
580        "       .section        .gcc_except_table,\"a\",@progbits\n"
581        // TABLE HEADER (important field is the BODY length at the end)
582        ".LLSDACFA2:\n"
583        "       .byte   0xff\n"
584        "       .byte   0xff\n"
585        "       .byte   0x1\n"
586        "       .uleb128 .LLSDACSECFA2-.LLSDACSBCFA2\n"
587        // BODY (language specific data)
588        ".LLSDACSBCFA2:\n"
589        //      Handled area start (relative to start of function)
590        "       .uleb128 .TRYSTART-__cfaehm_try_terminate\n"
591        //      Handled area length
592        "       .uleb128 .TRYEND-.TRYSTART\n"
593        //      Handler landing pad address (relative to start of function)
594        "       .uleb128 .CATCH-__cfaehm_try_terminate\n"
595        //      Action code, gcc seems to always use 0.
596        "       .uleb128 1\n"
597        // TABLE FOOTER
598        ".LLSDACSECFA2:\n"
599        "       .text\n"
600        "       .size   __cfaehm_try_terminate, .-__cfaehm_try_terminate\n"
601        "       .ident  \"GCC: (Ubuntu 6.2.0-3ubuntu11~16.04) 6.2.0 20160901\"\n"
602        "       .section        .note.GNU-stack,\"x\",@progbits\n"
603);
604#endif // __PIC__
605
606#pragma GCC pop_options
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