Mercurial > hg > CbC > CbC_gcc
annotate gcc/except.h @ 158:494b0b89df80 default tip
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author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Mon, 25 May 2020 18:13:55 +0900 |
parents | 1830386684a0 |
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rev | line source |
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0 | 1 /* Exception Handling interface routines. |
145 | 2 Copyright (C) 1996-2020 Free Software Foundation, Inc. |
0 | 3 Contributed by Mike Stump <mrs@cygnus.com>. |
4 | |
5 This file is part of GCC. | |
6 | |
7 GCC is free software; you can redistribute it and/or modify it under | |
8 the terms of the GNU General Public License as published by the Free | |
9 Software Foundation; either version 3, or (at your option) any later | |
10 version. | |
11 | |
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 for more details. | |
16 | |
17 You should have received a copy of the GNU General Public License | |
18 along with GCC; see the file COPYING3. If not see | |
19 <http://www.gnu.org/licenses/>. */ | |
20 | |
67
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21 /* No include guards here, but define an include file marker anyway, so |
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22 that the compiler can keep track of where this file is included. This |
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23 is e.g. used to avoid including this file in front-end specific files. */ |
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24 #ifndef GCC_EXCEPT_H |
111 | 25 #define GCC_EXCEPT_H |
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26 |
0 | 27 |
28 struct function; | |
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29 struct eh_region_d; |
0 | 30 |
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31 /* The type of an exception region. */ |
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32 enum eh_region_type |
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33 { |
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34 /* CLEANUP regions implement e.g. destructors run when exiting a block. |
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35 They can be generated from both GIMPLE_TRY_FINALLY and GIMPLE_TRY_CATCH |
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36 nodes. It is expected by the runtime that cleanup regions will *not* |
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37 resume normal program flow, but will continue propagation of the |
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38 exception. */ |
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39 ERT_CLEANUP, |
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40 |
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41 /* TRY regions implement catching an exception. The list of types associated |
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42 with the attached catch handlers is examined in order by the runtime and |
111 | 43 control is transferred to the appropriate handler. Note that a NULL type |
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44 list is a catch-all handler, and that it will catch *all* exceptions |
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45 including those originating from a different language. */ |
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46 ERT_TRY, |
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47 |
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48 /* ALLOWED_EXCEPTIONS regions implement exception filtering, e.g. the |
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49 throw(type-list) specification that can be added to C++ functions. |
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50 The runtime examines the thrown exception vs the type list, and if |
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51 the exception does not match, transfers control to the handler. The |
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52 normal handler for C++ calls __cxa_call_unexpected. */ |
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53 ERT_ALLOWED_EXCEPTIONS, |
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54 |
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55 /* MUST_NOT_THROW regions prevent all exceptions from propagating. This |
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56 region type is used in C++ to surround destructors being run inside a |
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57 CLEANUP region. This differs from an ALLOWED_EXCEPTIONS region with |
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58 an empty type list in that the runtime is prepared to terminate the |
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59 program directly. We only generate code for MUST_NOT_THROW regions |
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60 along control paths that are already handling an exception within the |
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61 current function. */ |
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62 ERT_MUST_NOT_THROW |
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63 }; |
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64 |
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65 |
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66 /* A landing pad for a given exception region. Any transfer of control |
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67 from the EH runtime to the function happens at a landing pad. */ |
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68 |
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69 struct GTY(()) eh_landing_pad_d |
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70 { |
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71 /* The linked list of all landing pads associated with the region. */ |
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72 struct eh_landing_pad_d *next_lp; |
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73 |
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74 /* The region with which this landing pad is associated. */ |
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75 struct eh_region_d *region; |
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76 |
111 | 77 /* At the gimple level, the location to which control will be transferred |
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78 for this landing pad. There can be both EH and normal edges into the |
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79 block containing the post-landing-pad label. */ |
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80 tree post_landing_pad; |
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81 |
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82 /* At the rtl level, the location to which the runtime will transfer |
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83 control. This differs from the post-landing-pad in that the target's |
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84 EXCEPTION_RECEIVER pattern will be expanded here, as well as other |
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85 bookkeeping specific to exceptions. There must not be normal edges |
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86 into the block containing the landing-pad label. */ |
111 | 87 rtx_code_label *landing_pad; |
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88 |
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89 /* The index of this landing pad within fun->eh->lp_array. */ |
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90 int index; |
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91 }; |
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92 |
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93 /* A catch handler associated with an ERT_TRY region. */ |
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94 |
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95 struct GTY(()) eh_catch_d |
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96 { |
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97 /* The double-linked list of all catch handlers for the region. */ |
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98 struct eh_catch_d *next_catch; |
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99 struct eh_catch_d *prev_catch; |
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100 |
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101 /* A TREE_LIST of runtime type objects that this catch handler |
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102 will catch, or NULL if all exceptions are caught. */ |
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103 tree type_list; |
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104 |
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105 /* A TREE_LIST of INTEGER_CSTs that correspond to the type_list entries, |
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106 having been mapped by assign_filter_values. These integers are to be |
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107 compared against the __builtin_eh_filter value. */ |
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108 tree filter_list; |
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109 |
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110 /* The code that should be executed if this catch handler matches the |
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111 thrown exception. This label is only maintained until |
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112 pass_lower_eh_dispatch, at which point it is cleared. */ |
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113 tree label; |
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114 }; |
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115 |
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116 /* Describes one exception region. */ |
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117 |
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118 struct GTY(()) eh_region_d |
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119 { |
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120 /* The immediately surrounding region. */ |
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121 struct eh_region_d *outer; |
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122 |
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123 /* The list of immediately contained regions. */ |
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124 struct eh_region_d *inner; |
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125 struct eh_region_d *next_peer; |
0 | 126 |
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127 /* The index of this region within fun->eh->region_array. */ |
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128 int index; |
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129 |
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130 /* Each region does exactly one thing. */ |
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131 enum eh_region_type type; |
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132 |
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133 /* Holds the action to perform based on the preceding type. */ |
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134 union eh_region_u { |
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135 struct eh_region_u_try { |
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136 /* The double-linked list of all catch handlers for this region. */ |
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137 struct eh_catch_d *first_catch; |
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138 struct eh_catch_d *last_catch; |
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139 } GTY ((tag ("ERT_TRY"))) eh_try; |
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140 |
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141 struct eh_region_u_allowed { |
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142 /* A TREE_LIST of runtime type objects allowed to pass. */ |
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143 tree type_list; |
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144 /* The code that should be executed if the thrown exception does |
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145 not match the type list. This label is only maintained until |
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146 pass_lower_eh_dispatch, at which point it is cleared. */ |
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147 tree label; |
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148 /* The integer that will be passed by the runtime to signal that |
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149 we should execute the code at LABEL. This integer is assigned |
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150 by assign_filter_values and is to be compared against the |
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151 __builtin_eh_filter value. */ |
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152 int filter; |
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153 } GTY ((tag ("ERT_ALLOWED_EXCEPTIONS"))) allowed; |
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154 |
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155 struct eh_region_u_must_not_throw { |
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156 /* A function decl to be invoked if this region is actually reachable |
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157 from within the function, rather than implementable from the runtime. |
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158 The normal way for this to happen is for there to be a CLEANUP region |
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159 contained within this MUST_NOT_THROW region. Note that if the |
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160 runtime handles the MUST_NOT_THROW region, we have no control over |
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161 what termination function is called; it will be decided by the |
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162 personality function in effect for this CIE. */ |
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163 tree failure_decl; |
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164 /* The location assigned to the call of FAILURE_DECL, if expanded. */ |
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165 location_t failure_loc; |
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166 } GTY ((tag ("ERT_MUST_NOT_THROW"))) must_not_throw; |
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167 } GTY ((desc ("%0.type"))) u; |
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168 |
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169 /* The list of landing pads associated with this region. */ |
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170 struct eh_landing_pad_d *landing_pads; |
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171 |
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172 /* EXC_PTR and FILTER values copied from the runtime for this region. |
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173 Each region gets its own psuedos so that if there are nested exceptions |
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174 we do not overwrite the values of the first exception. */ |
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175 rtx exc_ptr_reg, filter_reg; |
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176 |
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177 /* True if this region should use __cxa_end_cleanup instead |
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178 of _Unwind_Resume. */ |
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179 bool use_cxa_end_cleanup; |
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180 }; |
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181 |
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182 typedef struct eh_landing_pad_d *eh_landing_pad; |
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183 typedef struct eh_catch_d *eh_catch; |
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184 typedef struct eh_region_d *eh_region; |
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185 |
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186 |
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187 |
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188 |
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189 /* The exception status for each function. */ |
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190 |
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191 struct GTY(()) eh_status |
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192 { |
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193 /* The tree of all regions for this function. */ |
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194 eh_region region_tree; |
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195 |
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196 /* The same information as an indexable array. */ |
111 | 197 vec<eh_region, va_gc> *region_array; |
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198 |
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199 /* The landing pads as an indexable array. */ |
111 | 200 vec<eh_landing_pad, va_gc> *lp_array; |
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201 |
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202 /* At the gimple level, a mapping from gimple statement to landing pad |
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203 or must-not-throw region. See record_stmt_eh_region. */ |
111 | 204 hash_map<gimple *, int> *GTY(()) throw_stmt_table; |
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205 |
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206 /* All of the runtime type data used by the function. These objects |
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207 are emitted to the lang-specific-data-area for the function. */ |
111 | 208 vec<tree, va_gc> *ttype_data; |
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209 |
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210 /* The table of all action chains. These encode the eh_region tree in |
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211 a compact form for use by the runtime, and is also emitted to the |
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212 lang-specific-data-area. Note that the ARM EABI uses a different |
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213 format for the encoding than all other ports. */ |
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214 union eh_status_u { |
111 | 215 vec<tree, va_gc> *GTY((tag ("1"))) arm_eabi; |
216 vec<uchar, va_gc> *GTY((tag ("0"))) other; | |
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217 } GTY ((desc ("targetm.arm_eabi_unwinder"))) ehspec_data; |
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218 }; |
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219 |
0 | 220 |
221 /* Invokes CALLBACK for every exception handler label. Only used by old | |
222 loop hackery; should not be used by new code. */ | |
223 extern void for_each_eh_label (void (*) (rtx)); | |
224 | |
225 extern void init_eh_for_function (void); | |
226 | |
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227 extern void remove_eh_landing_pad (eh_landing_pad); |
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228 extern void remove_eh_handler (eh_region); |
111 | 229 extern void remove_unreachable_eh_regions (sbitmap); |
0 | 230 |
231 extern bool current_function_has_exception_handlers (void); | |
131 | 232 extern void output_function_exception_table (int); |
0 | 233 |
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234 extern rtx expand_builtin_eh_pointer (tree); |
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235 extern rtx expand_builtin_eh_filter (tree); |
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236 extern rtx expand_builtin_eh_copy_values (tree); |
0 | 237 extern void expand_builtin_unwind_init (void); |
238 extern rtx expand_builtin_eh_return_data_regno (tree); | |
239 extern rtx expand_builtin_extract_return_addr (tree); | |
240 extern void expand_builtin_init_dwarf_reg_sizes (tree); | |
241 extern rtx expand_builtin_frob_return_addr (tree); | |
242 extern rtx expand_builtin_dwarf_sp_column (void); | |
243 extern void expand_builtin_eh_return (tree, tree); | |
244 extern void expand_eh_return (void); | |
245 extern rtx expand_builtin_extend_pointer (tree); | |
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246 |
0 | 247 typedef tree (*duplicate_eh_regions_map) (tree, void *); |
111 | 248 extern hash_map<void *, void *> *duplicate_eh_regions |
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249 (struct function *, eh_region, int, duplicate_eh_regions_map, void *); |
0 | 250 |
111 | 251 extern void sjlj_emit_function_exit_after (rtx_insn *); |
252 extern void update_sjlj_context (void); | |
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253 |
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254 extern eh_region gen_eh_region_cleanup (eh_region); |
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255 extern eh_region gen_eh_region_try (eh_region); |
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256 extern eh_region gen_eh_region_allowed (eh_region, tree); |
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257 extern eh_region gen_eh_region_must_not_throw (eh_region); |
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258 |
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259 extern eh_catch gen_eh_region_catch (eh_region, tree); |
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260 extern eh_landing_pad gen_eh_landing_pad (eh_region); |
0 | 261 |
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262 extern eh_region get_eh_region_from_number_fn (struct function *, int); |
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263 extern eh_region get_eh_region_from_number (int); |
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264 extern eh_landing_pad get_eh_landing_pad_from_number_fn (struct function*,int); |
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265 extern eh_landing_pad get_eh_landing_pad_from_number (int); |
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266 extern eh_region get_eh_region_from_lp_number_fn (struct function *, int); |
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267 extern eh_region get_eh_region_from_lp_number (int); |
0 | 268 |
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269 extern eh_region eh_region_outermost (struct function *, eh_region, eh_region); |
0 | 270 |
111 | 271 extern void make_reg_eh_region_note (rtx_insn *insn, int ecf_flags, int lp_nr); |
272 extern void make_reg_eh_region_note_nothrow_nononlocal (rtx_insn *); | |
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273 |
0 | 274 extern void verify_eh_tree (struct function *); |
275 extern void dump_eh_tree (FILE *, struct function *); | |
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276 void debug_eh_tree (struct function *); |
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277 extern void add_type_for_runtime (tree); |
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278 extern tree lookup_type_for_runtime (tree); |
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279 extern void assign_filter_values (void); |
0 | 280 |
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281 extern eh_region get_eh_region_from_rtx (const_rtx); |
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282 extern eh_landing_pad get_eh_landing_pad_from_rtx (const_rtx); |
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283 |
111 | 284 extern void finish_eh_generation (void); |
285 | |
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286 struct GTY(()) throw_stmt_node { |
111 | 287 gimple *stmt; |
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288 int lp_nr; |
0 | 289 }; |
290 | |
111 | 291 extern hash_map<gimple *, int> *get_eh_throw_stmt_table (struct function *); |
292 extern void set_eh_throw_stmt_table (function *, hash_map<gimple *, int> *); | |
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293 |
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294 enum eh_personality_kind { |
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295 eh_personality_none, |
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296 eh_personality_any, |
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297 eh_personality_lang |
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298 }; |
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299 |
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300 extern enum eh_personality_kind |
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301 function_needs_eh_personality (struct function *); |
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302 |
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303 /* Pre-order iteration within the eh_region tree. */ |
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304 |
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305 static inline eh_region |
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306 ehr_next (eh_region r, eh_region start) |
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307 { |
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308 if (r->inner) |
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309 r = r->inner; |
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310 else if (r->next_peer && r != start) |
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311 r = r->next_peer; |
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312 else |
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313 { |
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314 do |
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315 { |
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316 r = r->outer; |
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317 if (r == start) |
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318 return NULL; |
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319 } |
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320 while (r->next_peer == NULL); |
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321 r = r->next_peer; |
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322 } |
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323 return r; |
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324 } |
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325 |
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326 #define FOR_ALL_EH_REGION_AT(R, START) \ |
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327 for ((R) = (START); (R) != NULL; (R) = ehr_next (R, START)) |
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328 |
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329 #define FOR_ALL_EH_REGION_FN(R, FN) \ |
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330 for ((R) = (FN)->eh->region_tree; (R) != NULL; (R) = ehr_next (R, NULL)) |
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331 |
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332 #define FOR_ALL_EH_REGION(R) FOR_ALL_EH_REGION_FN (R, cfun) |
111 | 333 |
334 #endif |