Mercurial > hg > CbC > CbC_gcc
annotate gcc/unwind-c.c @ 55:77e2b8dfacca gcc-4.4.5
update it from 4.4.3 to 4.5.0
| author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Fri, 12 Feb 2010 23:39:51 +0900 |
| parents | a06113de4d67 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* Supporting functions for C exception handling. |
| 2 Copyright (C) 2002, 2003, 2009 Free Software Foundation, Inc. | |
| 3 Contributed by Aldy Hernandez <aldy@quesejoda.com>. | |
| 4 Shamelessly stolen from the Java front end. | |
| 5 | |
| 6 This file is part of GCC. | |
| 7 | |
| 8 GCC is free software; you can redistribute it and/or modify it under | |
| 9 the terms of the GNU General Public License as published by the Free | |
| 10 Software Foundation; either version 3, or (at your option) any later | |
| 11 version. | |
| 12 | |
| 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 Under Section 7 of GPL version 3, you are granted additional | |
| 19 permissions described in the GCC Runtime Library Exception, version | |
| 20 3.1, as published by the Free Software Foundation. | |
| 21 | |
| 22 You should have received a copy of the GNU General Public License and | |
| 23 a copy of the GCC Runtime Library Exception along with this program; | |
| 24 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
| 25 <http://www.gnu.org/licenses/>. */ | |
| 26 | |
| 27 #include "tconfig.h" | |
| 28 #include "tsystem.h" | |
| 29 #include "unwind.h" | |
| 30 #define NO_SIZE_OF_ENCODED_VALUE | |
| 31 #include "unwind-pe.h" | |
| 32 | |
| 33 typedef struct | |
| 34 { | |
| 35 _Unwind_Ptr Start; | |
| 36 _Unwind_Ptr LPStart; | |
| 37 _Unwind_Ptr ttype_base; | |
| 38 const unsigned char *TType; | |
| 39 const unsigned char *action_table; | |
| 40 unsigned char ttype_encoding; | |
| 41 unsigned char call_site_encoding; | |
| 42 } lsda_header_info; | |
| 43 | |
| 44 static const unsigned char * | |
| 45 parse_lsda_header (struct _Unwind_Context *context, const unsigned char *p, | |
| 46 lsda_header_info *info) | |
| 47 { | |
| 48 _uleb128_t tmp; | |
| 49 unsigned char lpstart_encoding; | |
| 50 | |
| 51 info->Start = (context ? _Unwind_GetRegionStart (context) : 0); | |
| 52 | |
| 53 /* Find @LPStart, the base to which landing pad offsets are relative. */ | |
| 54 lpstart_encoding = *p++; | |
| 55 if (lpstart_encoding != DW_EH_PE_omit) | |
| 56 p = read_encoded_value (context, lpstart_encoding, p, &info->LPStart); | |
| 57 else | |
| 58 info->LPStart = info->Start; | |
| 59 | |
| 60 /* Find @TType, the base of the handler and exception spec type data. */ | |
| 61 info->ttype_encoding = *p++; | |
| 62 if (info->ttype_encoding != DW_EH_PE_omit) | |
| 63 { | |
| 64 p = read_uleb128 (p, &tmp); | |
| 65 info->TType = p + tmp; | |
| 66 } | |
| 67 else | |
| 68 info->TType = 0; | |
| 69 | |
| 70 /* The encoding and length of the call-site table; the action table | |
| 71 immediately follows. */ | |
| 72 info->call_site_encoding = *p++; | |
| 73 p = read_uleb128 (p, &tmp); | |
| 74 info->action_table = p + tmp; | |
| 75 | |
| 76 return p; | |
| 77 } | |
| 78 | |
| 79 #ifdef __ARM_EABI_UNWINDER__ | |
| 80 /* ARM EABI personality routines must also unwind the stack. */ | |
| 81 #define CONTINUE_UNWINDING \ | |
| 82 do \ | |
| 83 { \ | |
| 84 if (__gnu_unwind_frame (ue_header, context) != _URC_OK) \ | |
| 85 return _URC_FAILURE; \ | |
| 86 return _URC_CONTINUE_UNWIND; \ | |
| 87 } \ | |
| 88 while (0) | |
| 89 #else | |
| 90 #define CONTINUE_UNWINDING return _URC_CONTINUE_UNWIND | |
| 91 #endif | |
| 92 | |
| 93 #ifdef __USING_SJLJ_EXCEPTIONS__ | |
| 94 #define PERSONALITY_FUNCTION __gcc_personality_sj0 | |
| 95 #define __builtin_eh_return_data_regno(x) x | |
| 96 #else | |
| 97 #define PERSONALITY_FUNCTION __gcc_personality_v0 | |
| 98 #endif | |
| 99 | |
| 100 #ifdef __ARM_EABI_UNWINDER__ | |
| 101 _Unwind_Reason_Code | |
| 102 PERSONALITY_FUNCTION (_Unwind_State, struct _Unwind_Exception *, | |
| 103 struct _Unwind_Context *); | |
| 104 | |
| 105 _Unwind_Reason_Code | |
| 106 PERSONALITY_FUNCTION (_Unwind_State state, | |
| 107 struct _Unwind_Exception * ue_header, | |
| 108 struct _Unwind_Context * context) | |
| 109 #else | |
| 110 _Unwind_Reason_Code | |
| 111 PERSONALITY_FUNCTION (int, _Unwind_Action, _Unwind_Exception_Class, | |
| 112 struct _Unwind_Exception *, struct _Unwind_Context *); | |
| 113 | |
| 114 _Unwind_Reason_Code | |
| 115 PERSONALITY_FUNCTION (int version, | |
| 116 _Unwind_Action actions, | |
| 117 _Unwind_Exception_Class exception_class ATTRIBUTE_UNUSED, | |
| 118 struct _Unwind_Exception *ue_header, | |
| 119 struct _Unwind_Context *context) | |
| 120 #endif | |
| 121 { | |
| 122 lsda_header_info info; | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
123 const unsigned char *language_specific_data, *p; |
| 0 | 124 _Unwind_Ptr landing_pad, ip; |
| 125 int ip_before_insn = 0; | |
| 126 | |
| 127 #ifdef __ARM_EABI_UNWINDER__ | |
| 128 if ((state & _US_ACTION_MASK) != _US_UNWIND_FRAME_STARTING) | |
| 129 CONTINUE_UNWINDING; | |
| 130 | |
| 131 /* The dwarf unwinder assumes the context structure holds things like the | |
| 132 function and LSDA pointers. The ARM implementation caches these in | |
| 133 the exception header (UCB). To avoid rewriting everything we make the | |
| 134 virtual IP register point at the UCB. */ | |
| 135 ip = (_Unwind_Ptr) ue_header; | |
| 136 _Unwind_SetGR (context, 12, ip); | |
| 137 #else | |
| 138 if (version != 1) | |
| 139 return _URC_FATAL_PHASE1_ERROR; | |
| 140 | |
| 141 /* Currently we only support cleanups for C. */ | |
| 142 if ((actions & _UA_CLEANUP_PHASE) == 0) | |
| 143 CONTINUE_UNWINDING; | |
| 144 #endif | |
| 145 | |
| 146 language_specific_data = (const unsigned char *) | |
| 147 _Unwind_GetLanguageSpecificData (context); | |
| 148 | |
| 149 /* If no LSDA, then there are no handlers or cleanups. */ | |
| 150 if (! language_specific_data) | |
| 151 CONTINUE_UNWINDING; | |
| 152 | |
| 153 /* Parse the LSDA header. */ | |
| 154 p = parse_lsda_header (context, language_specific_data, &info); | |
| 155 #ifdef HAVE_GETIPINFO | |
| 156 ip = _Unwind_GetIPInfo (context, &ip_before_insn); | |
| 157 #else | |
| 158 ip = _Unwind_GetIP (context); | |
| 159 #endif | |
| 160 if (! ip_before_insn) | |
| 161 --ip; | |
| 162 landing_pad = 0; | |
| 163 | |
| 164 #ifdef __USING_SJLJ_EXCEPTIONS__ | |
| 165 /* The given "IP" is an index into the call-site table, with two | |
| 166 exceptions -- -1 means no-action, and 0 means terminate. But | |
| 167 since we're using uleb128 values, we've not got random access | |
| 168 to the array. */ | |
| 169 if ((int) ip <= 0) | |
| 170 return _URC_CONTINUE_UNWIND; | |
| 171 else | |
| 172 { | |
| 173 _uleb128_t cs_lp, cs_action; | |
| 174 do | |
| 175 { | |
| 176 p = read_uleb128 (p, &cs_lp); | |
| 177 p = read_uleb128 (p, &cs_action); | |
| 178 } | |
| 179 while (--ip); | |
| 180 | |
| 181 /* Can never have null landing pad for sjlj -- that would have | |
| 182 been indicated by a -1 call site index. */ | |
| 183 landing_pad = (_Unwind_Ptr)cs_lp + 1; | |
| 184 goto found_something; | |
| 185 } | |
| 186 #else | |
| 187 /* Search the call-site table for the action associated with this IP. */ | |
| 188 while (p < info.action_table) | |
| 189 { | |
| 190 _Unwind_Ptr cs_start, cs_len, cs_lp; | |
| 191 _uleb128_t cs_action; | |
| 192 | |
| 193 /* Note that all call-site encodings are "absolute" displacements. */ | |
| 194 p = read_encoded_value (0, info.call_site_encoding, p, &cs_start); | |
| 195 p = read_encoded_value (0, info.call_site_encoding, p, &cs_len); | |
| 196 p = read_encoded_value (0, info.call_site_encoding, p, &cs_lp); | |
| 197 p = read_uleb128 (p, &cs_action); | |
| 198 | |
| 199 /* The table is sorted, so if we've passed the ip, stop. */ | |
| 200 if (ip < info.Start + cs_start) | |
| 201 p = info.action_table; | |
| 202 else if (ip < info.Start + cs_start + cs_len) | |
| 203 { | |
| 204 if (cs_lp) | |
| 205 landing_pad = info.LPStart + cs_lp; | |
| 206 goto found_something; | |
| 207 } | |
| 208 } | |
| 209 #endif | |
| 210 | |
| 211 /* IP is not in table. No associated cleanups. */ | |
| 212 /* ??? This is where C++ calls std::terminate to catch throw | |
| 213 from a destructor. */ | |
| 214 CONTINUE_UNWINDING; | |
| 215 | |
| 216 found_something: | |
| 217 if (landing_pad == 0) | |
| 218 { | |
| 219 /* IP is present, but has a null landing pad. | |
| 220 No handler to be run. */ | |
| 221 CONTINUE_UNWINDING; | |
| 222 } | |
| 223 | |
| 224 _Unwind_SetGR (context, __builtin_eh_return_data_regno (0), | |
| 225 (_Unwind_Ptr) ue_header); | |
| 226 _Unwind_SetGR (context, __builtin_eh_return_data_regno (1), 0); | |
| 227 _Unwind_SetIP (context, landing_pad); | |
| 228 return _URC_INSTALL_CONTEXT; | |
| 229 } |