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annotate gcc/except.h @ 67:f6334be47118

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update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
author nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
date Tue, 22 Mar 2011 17:18:12 +0900
parents b7f97abdc517
children 04ced10e8804
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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1 /* Exception Handling interface routines.
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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2 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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3 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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4 Contributed by Mike Stump <mrs@cygnus.com>.
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5
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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6 This file is part of GCC.
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7
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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8 GCC is free software; you can redistribute it and/or modify it under
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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9 the terms of the GNU General Public License as published by the Free
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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10 Software Foundation; either version 3, or (at your option) any later
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11 version.
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12
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13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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18 You should have received a copy of the GNU General Public License
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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19 along with GCC; see the file COPYING3. If not see
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20 <http://www.gnu.org/licenses/>. */
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21
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22 /* No include guards here, but define an include file marker anyway, so
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23 that the compiler can keep track of where this file is included. This
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24 is e.g. used to avoid including this file in front-end specific files. */
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25 #ifndef GCC_EXCEPT_H
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26 # define GCC_EXCEPT_H
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27 #endif
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28
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29 #include "hashtab.h"
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30 #include "vecprim.h"
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31 #include "vecir.h"
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32
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33 struct function;
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34 struct eh_region_d;
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35 struct pointer_map_t;
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36
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37 /* The type of an exception region. */
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38 enum eh_region_type
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39 {
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40 /* CLEANUP regions implement e.g. destructors run when exiting a block.
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41 They can be generated from both GIMPLE_TRY_FINALLY and GIMPLE_TRY_CATCH
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42 nodes. It is expected by the runtime that cleanup regions will *not*
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43 resume normal program flow, but will continue propagation of the
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44 exception. */
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45 ERT_CLEANUP,
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46
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47 /* TRY regions implement catching an exception. The list of types associated
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48 with the attached catch handlers is examined in order by the runtime and
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49 control is transfered to the appropriate handler. Note that a NULL type
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50 list is a catch-all handler, and that it will catch *all* exceptions
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51 including those originating from a different language. */
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52 ERT_TRY,
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53
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54 /* ALLOWED_EXCEPTIONS regions implement exception filtering, e.g. the
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55 throw(type-list) specification that can be added to C++ functions.
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56 The runtime examines the thrown exception vs the type list, and if
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57 the exception does not match, transfers control to the handler. The
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58 normal handler for C++ calls __cxa_call_unexpected. */
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59 ERT_ALLOWED_EXCEPTIONS,
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60
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61 /* MUST_NOT_THROW regions prevent all exceptions from propagating. This
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62 region type is used in C++ to surround destructors being run inside a
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63 CLEANUP region. This differs from an ALLOWED_EXCEPTIONS region with
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64 an empty type list in that the runtime is prepared to terminate the
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65 program directly. We only generate code for MUST_NOT_THROW regions
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66 along control paths that are already handling an exception within the
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67 current function. */
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68 ERT_MUST_NOT_THROW
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69 };
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70
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71
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72 /* A landing pad for a given exception region. Any transfer of control
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73 from the EH runtime to the function happens at a landing pad. */
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74
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75 struct GTY(()) eh_landing_pad_d
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76 {
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77 /* The linked list of all landing pads associated with the region. */
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78 struct eh_landing_pad_d *next_lp;
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79
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80 /* The region with which this landing pad is associated. */
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81 struct eh_region_d *region;
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82
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83 /* At the gimple level, the location to which control will be transfered
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84 for this landing pad. There can be both EH and normal edges into the
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85 block containing the post-landing-pad label. */
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86 tree post_landing_pad;
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87
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88 /* At the rtl level, the location to which the runtime will transfer
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89 control. This differs from the post-landing-pad in that the target's
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90 EXCEPTION_RECEIVER pattern will be expanded here, as well as other
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91 bookkeeping specific to exceptions. There must not be normal edges
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92 into the block containing the landing-pad label. */
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93 rtx landing_pad;
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94
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95 /* The index of this landing pad within fun->eh->lp_array. */
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96 int index;
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97 };
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98
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99 /* A catch handler associated with an ERT_TRY region. */
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100
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101 struct GTY(()) eh_catch_d
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102 {
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103 /* The double-linked list of all catch handlers for the region. */
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104 struct eh_catch_d *next_catch;
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105 struct eh_catch_d *prev_catch;
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106
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107 /* A TREE_LIST of runtime type objects that this catch handler
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108 will catch, or NULL if all exceptions are caught. */
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109 tree type_list;
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110
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111 /* A TREE_LIST of INTEGER_CSTs that correspond to the type_list entries,
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112 having been mapped by assign_filter_values. These integers are to be
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113 compared against the __builtin_eh_filter value. */
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114 tree filter_list;
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115
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116 /* The code that should be executed if this catch handler matches the
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117 thrown exception. This label is only maintained until
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118 pass_lower_eh_dispatch, at which point it is cleared. */
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119 tree label;
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120 };
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121
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122 /* Describes one exception region. */
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123
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124 struct GTY(()) eh_region_d
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125 {
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126 /* The immediately surrounding region. */
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127 struct eh_region_d *outer;
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128
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129 /* The list of immediately contained regions. */
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130 struct eh_region_d *inner;
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131 struct eh_region_d *next_peer;
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132
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133 /* The index of this region within fun->eh->region_array. */
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134 int index;
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135
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136 /* Each region does exactly one thing. */
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137 enum eh_region_type type;
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138
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139 /* Holds the action to perform based on the preceding type. */
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140 union eh_region_u {
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141 struct eh_region_u_try {
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142 /* The double-linked list of all catch handlers for this region. */
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143 struct eh_catch_d *first_catch;
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144 struct eh_catch_d *last_catch;
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145 } GTY ((tag ("ERT_TRY"))) eh_try;
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146
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147 struct eh_region_u_allowed {
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148 /* A TREE_LIST of runtime type objects allowed to pass. */
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149 tree type_list;
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150 /* The code that should be executed if the thrown exception does
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151 not match the type list. This label is only maintained until
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152 pass_lower_eh_dispatch, at which point it is cleared. */
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153 tree label;
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154 /* The integer that will be passed by the runtime to signal that
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155 we should execute the code at LABEL. This integer is assigned
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156 by assign_filter_values and is to be compared against the
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157 __builtin_eh_filter value. */
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158 int filter;
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159 } GTY ((tag ("ERT_ALLOWED_EXCEPTIONS"))) allowed;
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160
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161 struct eh_region_u_must_not_throw {
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162 /* A function decl to be invoked if this region is actually reachable
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163 from within the function, rather than implementable from the runtime.
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164 The normal way for this to happen is for there to be a CLEANUP region
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165 contained within this MUST_NOT_THROW region. Note that if the
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166 runtime handles the MUST_NOT_THROW region, we have no control over
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167 what termination function is called; it will be decided by the
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168 personality function in effect for this CIE. */
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169 tree failure_decl;
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170 /* The location assigned to the call of FAILURE_DECL, if expanded. */
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171 location_t failure_loc;
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172 } GTY ((tag ("ERT_MUST_NOT_THROW"))) must_not_throw;
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173 } GTY ((desc ("%0.type"))) u;
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174
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175 /* The list of landing pads associated with this region. */
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176 struct eh_landing_pad_d *landing_pads;
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177
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178 /* EXC_PTR and FILTER values copied from the runtime for this region.
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179 Each region gets its own psuedos so that if there are nested exceptions
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180 we do not overwrite the values of the first exception. */
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181 rtx exc_ptr_reg, filter_reg;
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182
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183 /* True if this region should use __cxa_end_cleanup instead
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184 of _Unwind_Resume. */
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185 bool use_cxa_end_cleanup;
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186 };
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187
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188 typedef struct eh_landing_pad_d *eh_landing_pad;
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189 typedef struct eh_catch_d *eh_catch;
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190 typedef struct eh_region_d *eh_region;
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191
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192 DEF_VEC_P(eh_region);
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193 DEF_VEC_ALLOC_P(eh_region, gc);
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194 DEF_VEC_ALLOC_P(eh_region, heap);
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195
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196 DEF_VEC_P(eh_landing_pad);
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197 DEF_VEC_ALLOC_P(eh_landing_pad, gc);
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198
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199
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200 /* The exception status for each function. */
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201
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202 struct GTY(()) eh_status
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203 {
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204 /* The tree of all regions for this function. */
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205 eh_region region_tree;
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206
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207 /* The same information as an indexable array. */
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208 VEC(eh_region,gc) *region_array;
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209
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210 /* The landing pads as an indexable array. */
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211 VEC(eh_landing_pad,gc) *lp_array;
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212
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213 /* At the gimple level, a mapping from gimple statement to landing pad
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214 or must-not-throw region. See record_stmt_eh_region. */
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215 htab_t GTY((param_is (struct throw_stmt_node))) throw_stmt_table;
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216
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217 /* All of the runtime type data used by the function. These objects
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218 are emitted to the lang-specific-data-area for the function. */
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219 VEC(tree,gc) *ttype_data;
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220
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221 /* The table of all action chains. These encode the eh_region tree in
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222 a compact form for use by the runtime, and is also emitted to the
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223 lang-specific-data-area. Note that the ARM EABI uses a different
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224 format for the encoding than all other ports. */
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225 union eh_status_u {
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226 VEC(tree,gc) * GTY((tag ("1"))) arm_eabi;
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227 VEC(uchar,gc) * GTY((tag ("0"))) other;
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228 } GTY ((desc ("targetm.arm_eabi_unwinder"))) ehspec_data;
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229 };
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230
0
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231
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232 /* Invokes CALLBACK for every exception handler label. Only used by old
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233 loop hackery; should not be used by new code. */
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234 extern void for_each_eh_label (void (*) (rtx));
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235
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236 extern void init_eh_for_function (void);
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237
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238 extern void remove_eh_landing_pad (eh_landing_pad);
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239 extern void remove_eh_handler (eh_region);
0
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240
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241 extern bool current_function_has_exception_handlers (void);
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242 extern void output_function_exception_table (const char *);
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243
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244 extern rtx expand_builtin_eh_pointer (tree);
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245 extern rtx expand_builtin_eh_filter (tree);
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246 extern rtx expand_builtin_eh_copy_values (tree);
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247 extern void expand_builtin_unwind_init (void);
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248 extern rtx expand_builtin_eh_return_data_regno (tree);
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249 extern rtx expand_builtin_extract_return_addr (tree);
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250 extern void expand_builtin_init_dwarf_reg_sizes (tree);
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251 extern rtx expand_builtin_frob_return_addr (tree);
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252 extern rtx expand_builtin_dwarf_sp_column (void);
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253 extern void expand_builtin_eh_return (tree, tree);
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254 extern void expand_eh_return (void);
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255 extern rtx expand_builtin_extend_pointer (tree);
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256
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257 typedef tree (*duplicate_eh_regions_map) (tree, void *);
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258 extern struct pointer_map_t *duplicate_eh_regions
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259 (struct function *, eh_region, int, duplicate_eh_regions_map, void *);
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260
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261 extern void sjlj_emit_function_exit_after (rtx);
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262
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263 extern eh_region gen_eh_region_cleanup (eh_region);
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264 extern eh_region gen_eh_region_try (eh_region);
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265 extern eh_region gen_eh_region_allowed (eh_region, tree);
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266 extern eh_region gen_eh_region_must_not_throw (eh_region);
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267
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268 extern eh_catch gen_eh_region_catch (eh_region, tree);
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269 extern eh_landing_pad gen_eh_landing_pad (eh_region);
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270
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271 extern eh_region get_eh_region_from_number_fn (struct function *, int);
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272 extern eh_region get_eh_region_from_number (int);
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273 extern eh_landing_pad get_eh_landing_pad_from_number_fn (struct function*,int);
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274 extern eh_landing_pad get_eh_landing_pad_from_number (int);
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275 extern eh_region get_eh_region_from_lp_number_fn (struct function *, int);
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276 extern eh_region get_eh_region_from_lp_number (int);
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277
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278 extern eh_region eh_region_outermost (struct function *, eh_region, eh_region);
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279
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280 extern void make_reg_eh_region_note (rtx insn, int ecf_flags, int lp_nr);
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281 extern void make_reg_eh_region_note_nothrow_nononlocal (rtx);
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282
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283 extern void verify_eh_tree (struct function *);
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284 extern void dump_eh_tree (FILE *, struct function *);
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285 void debug_eh_tree (struct function *);
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286 extern void add_type_for_runtime (tree);
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287 extern tree lookup_type_for_runtime (tree);
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288 extern void assign_filter_values (void);
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289
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290 extern eh_region get_eh_region_from_rtx (const_rtx);
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291 extern eh_landing_pad get_eh_landing_pad_from_rtx (const_rtx);
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292
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293 struct GTY(()) throw_stmt_node {
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294 gimple stmt;
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295 int lp_nr;
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296 };
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297
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298 extern struct htab *get_eh_throw_stmt_table (struct function *);
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299 extern void set_eh_throw_stmt_table (struct function *, struct htab *);
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300
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301 enum eh_personality_kind {
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302 eh_personality_none,
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303 eh_personality_any,
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304 eh_personality_lang
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305 };
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306
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307 extern enum eh_personality_kind
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308 function_needs_eh_personality (struct function *);
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309
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310 /* Pre-order iteration within the eh_region tree. */
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311
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312 static inline eh_region
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313 ehr_next (eh_region r, eh_region start)
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314 {
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315 if (r->inner)
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316 r = r->inner;
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317 else if (r->next_peer && r != start)
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318 r = r->next_peer;
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319 else
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320 {
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321 do
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322 {
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323 r = r->outer;
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324 if (r == start)
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325 return NULL;
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326 }
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327 while (r->next_peer == NULL);
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328 r = r->next_peer;
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329 }
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330 return r;
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331 }
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332
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333 #define FOR_ALL_EH_REGION_AT(R, START) \
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334 for ((R) = (START); (R) != NULL; (R) = ehr_next (R, START))
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335
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336 #define FOR_ALL_EH_REGION_FN(R, FN) \
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337 for ((R) = (FN)->eh->region_tree; (R) != NULL; (R) = ehr_next (R, NULL))
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338
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339 #define FOR_ALL_EH_REGION(R) FOR_ALL_EH_REGION_FN (R, cfun)