Mercurial > hg > CbC > CbC_gcc
annotate gcc/except.h @ 55:77e2b8dfacca gcc-4.4.5
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| author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Fri, 12 Feb 2010 23:39:51 +0900 |
| parents | a06113de4d67 |
| children | b7f97abdc517 |
| rev | line source |
|---|---|
| 0 | 1 /* Exception Handling interface routines. |
| 2 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, | |
|
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3 2007, 2008, 2009 Free Software Foundation, Inc. |
| 0 | 4 Contributed by Mike Stump <mrs@cygnus.com>. |
| 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 You should have received a copy of the GNU General Public License | |
| 19 along with GCC; see the file COPYING3. If not see | |
| 20 <http://www.gnu.org/licenses/>. */ | |
| 21 | |
|
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22 #include "sbitmap.h" |
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23 #include "vecprim.h" |
| 0 | 24 |
| 25 struct function; | |
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26 struct eh_region_d; |
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27 struct pointer_map_t; |
| 0 | 28 |
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29 /* The type of an exception region. */ |
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30 enum eh_region_type |
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31 { |
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32 /* CLEANUP regions implement e.g. destructors run when exiting a block. |
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33 They can be generated from both GIMPLE_TRY_FINALLY and GIMPLE_TRY_CATCH |
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34 nodes. It is expected by the runtime that cleanup regions will *not* |
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35 resume normal program flow, but will continue propagation of the |
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36 exception. */ |
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37 ERT_CLEANUP, |
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38 |
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39 /* TRY regions implement catching an exception. The list of types associated |
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40 with the attached catch handlers is examined in order by the runtime and |
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41 control is transfered to the appropriate handler. Note that a NULL type |
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42 list is a catch-all handler, and that it will catch *all* exceptions |
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43 including those originating from a different language. */ |
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44 ERT_TRY, |
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45 |
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46 /* ALLOWED_EXCEPTIONS regions implement exception filtering, e.g. the |
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47 throw(type-list) specification that can be added to C++ functions. |
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48 The runtime examines the thrown exception vs the type list, and if |
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49 the exception does not match, transfers control to the handler. The |
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50 normal handler for C++ calls __cxa_call_unexpected. */ |
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51 ERT_ALLOWED_EXCEPTIONS, |
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52 |
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53 /* MUST_NOT_THROW regions prevent all exceptions from propagating. This |
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54 region type is used in C++ to surround destructors being run inside a |
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55 CLEANUP region. This differs from an ALLOWED_EXCEPTIONS region with |
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56 an empty type list in that the runtime is prepared to terminate the |
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57 program directly. We only generate code for MUST_NOT_THROW regions |
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58 along control paths that are already handling an exception within the |
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59 current function. */ |
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60 ERT_MUST_NOT_THROW |
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61 }; |
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62 |
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63 |
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64 /* A landing pad for a given exception region. Any transfer of control |
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65 from the EH runtime to the function happens at a landing pad. */ |
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66 |
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67 struct GTY(()) eh_landing_pad_d |
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68 { |
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69 /* The linked list of all landing pads associated with the region. */ |
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70 struct eh_landing_pad_d *next_lp; |
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71 |
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72 /* The region with which this landing pad is associated. */ |
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73 struct eh_region_d *region; |
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74 |
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75 /* At the gimple level, the location to which control will be transfered |
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76 for this landing pad. There can be both EH and normal edges into the |
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77 block containing the post-landing-pad label. */ |
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78 tree post_landing_pad; |
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79 |
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80 /* At the rtl level, the location to which the runtime will transfer |
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81 control. This differs from the post-landing-pad in that the target's |
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82 EXCEPTION_RECEIVER pattern will be expanded here, as well as other |
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83 bookkeeping specific to exceptions. There must not be normal edges |
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84 into the block containing the landing-pad label. */ |
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85 rtx landing_pad; |
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86 |
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87 /* The index of this landing pad within fun->eh->lp_array. */ |
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88 int index; |
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89 }; |
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90 |
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91 /* A catch handler associated with an ERT_TRY region. */ |
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92 |
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93 struct GTY(()) eh_catch_d |
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94 { |
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95 /* The double-linked list of all catch handlers for the region. */ |
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96 struct eh_catch_d *next_catch; |
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97 struct eh_catch_d *prev_catch; |
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98 |
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99 /* A TREE_LIST of runtime type objects that this catch handler |
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100 will catch, or NULL if all exceptions are caught. */ |
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101 tree type_list; |
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102 |
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103 /* A TREE_LIST of INTEGER_CSTs that correspond to the type_list entries, |
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104 having been mapped by assign_filter_values. These integers are to be |
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105 compared against the __builtin_eh_filter value. */ |
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106 tree filter_list; |
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107 |
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108 /* The code that should be executed if this catch handler matches the |
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109 thrown exception. This label is only maintained until |
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110 pass_lower_eh_dispatch, at which point it is cleared. */ |
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111 tree label; |
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112 }; |
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113 |
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114 /* Describes one exception region. */ |
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115 |
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116 struct GTY(()) eh_region_d |
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117 { |
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118 /* The immediately surrounding region. */ |
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119 struct eh_region_d *outer; |
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120 |
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121 /* The list of immediately contained regions. */ |
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122 struct eh_region_d *inner; |
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123 struct eh_region_d *next_peer; |
| 0 | 124 |
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125 /* The index of this region within fun->eh->region_array. */ |
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126 int index; |
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127 |
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128 /* Each region does exactly one thing. */ |
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129 enum eh_region_type type; |
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130 |
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131 /* Holds the action to perform based on the preceding type. */ |
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132 union eh_region_u { |
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133 struct eh_region_u_try { |
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134 /* The double-linked list of all catch handlers for this region. */ |
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135 struct eh_catch_d *first_catch; |
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136 struct eh_catch_d *last_catch; |
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137 } GTY ((tag ("ERT_TRY"))) eh_try; |
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138 |
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139 struct eh_region_u_allowed { |
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140 /* A TREE_LIST of runtime type objects allowed to pass. */ |
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141 tree type_list; |
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142 /* The code that should be executed if the thrown exception does |
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143 not match the type list. This label is only maintained until |
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144 pass_lower_eh_dispatch, at which point it is cleared. */ |
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145 tree label; |
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146 /* The integer that will be passed by the runtime to signal that |
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147 we should execute the code at LABEL. This integer is assigned |
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148 by assign_filter_values and is to be compared against the |
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149 __builtin_eh_filter value. */ |
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150 int filter; |
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151 } GTY ((tag ("ERT_ALLOWED_EXCEPTIONS"))) allowed; |
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152 |
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153 struct eh_region_u_must_not_throw { |
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154 /* A function decl to be invoked if this region is actually reachable |
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155 from within the function, rather than implementable from the runtime. |
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156 The normal way for this to happen is for there to be a CLEANUP region |
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157 contained within this MUST_NOT_THROW region. Note that if the |
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158 runtime handles the MUST_NOT_THROW region, we have no control over |
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159 what termination function is called; it will be decided by the |
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160 personality function in effect for this CIE. */ |
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161 tree failure_decl; |
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162 /* The location assigned to the call of FAILURE_DECL, if expanded. */ |
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163 location_t failure_loc; |
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164 } GTY ((tag ("ERT_MUST_NOT_THROW"))) must_not_throw; |
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165 } GTY ((desc ("%0.type"))) u; |
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166 |
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167 /* The list of landing pads associated with this region. */ |
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168 struct eh_landing_pad_d *landing_pads; |
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169 |
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170 /* EXC_PTR and FILTER values copied from the runtime for this region. |
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171 Each region gets its own psuedos so that if there are nested exceptions |
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172 we do not overwrite the values of the first exception. */ |
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173 rtx exc_ptr_reg, filter_reg; |
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174 |
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175 /* True if this region should use __cxa_end_cleanup instead |
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176 of _Unwind_Resume. */ |
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177 bool use_cxa_end_cleanup; |
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178 }; |
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179 |
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180 typedef struct eh_landing_pad_d *eh_landing_pad; |
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181 typedef struct eh_catch_d *eh_catch; |
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182 typedef struct eh_region_d *eh_region; |
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183 |
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184 DEF_VEC_P(eh_region); |
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185 DEF_VEC_ALLOC_P(eh_region, gc); |
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186 DEF_VEC_ALLOC_P(eh_region, heap); |
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187 |
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188 DEF_VEC_P(eh_landing_pad); |
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189 DEF_VEC_ALLOC_P(eh_landing_pad, gc); |
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190 |
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191 |
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192 /* The exception status for each function. */ |
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193 |
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194 struct GTY(()) eh_status |
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195 { |
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196 /* The tree of all regions for this function. */ |
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197 eh_region region_tree; |
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198 |
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199 /* The same information as an indexable array. */ |
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200 VEC(eh_region,gc) *region_array; |
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201 |
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202 /* The landing pads as an indexable array. */ |
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203 VEC(eh_landing_pad,gc) *lp_array; |
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204 |
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205 /* At the gimple level, a mapping from gimple statement to landing pad |
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206 or must-not-throw region. See record_stmt_eh_region. */ |
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207 htab_t GTY((param_is (struct throw_stmt_node))) throw_stmt_table; |
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208 |
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209 /* All of the runtime type data used by the function. These objects |
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210 are emitted to the lang-specific-data-area for the function. */ |
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211 VEC(tree,gc) *ttype_data; |
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212 |
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213 /* The table of all action chains. These encode the eh_region tree in |
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214 a compact form for use by the runtime, and is also emitted to the |
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215 lang-specific-data-area. Note that the ARM EABI uses a different |
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216 format for the encoding than all other ports. */ |
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217 union eh_status_u { |
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218 VEC(tree,gc) * GTY((tag ("1"))) arm_eabi; |
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219 VEC(uchar,gc) * GTY((tag ("0"))) other; |
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220 } GTY ((desc ("targetm.arm_eabi_unwinder"))) ehspec_data; |
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221 }; |
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222 |
| 0 | 223 |
| 224 /* Test: is exception handling turned on? */ | |
| 225 extern int doing_eh (int); | |
| 226 | |
| 227 /* Invokes CALLBACK for every exception handler label. Only used by old | |
| 228 loop hackery; should not be used by new code. */ | |
| 229 extern void for_each_eh_label (void (*) (rtx)); | |
| 230 | |
| 231 extern void init_eh (void); | |
| 232 extern void init_eh_for_function (void); | |
| 233 | |
|
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234 extern void remove_eh_landing_pad (eh_landing_pad); |
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235 extern void remove_eh_handler (eh_region); |
| 0 | 236 |
| 237 extern bool current_function_has_exception_handlers (void); | |
| 238 extern void output_function_exception_table (const char *); | |
| 239 | |
|
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240 extern rtx expand_builtin_eh_pointer (tree); |
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241 extern rtx expand_builtin_eh_filter (tree); |
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242 extern rtx expand_builtin_eh_copy_values (tree); |
| 0 | 243 extern void expand_builtin_unwind_init (void); |
| 244 extern rtx expand_builtin_eh_return_data_regno (tree); | |
| 245 extern rtx expand_builtin_extract_return_addr (tree); | |
| 246 extern void expand_builtin_init_dwarf_reg_sizes (tree); | |
| 247 extern rtx expand_builtin_frob_return_addr (tree); | |
| 248 extern rtx expand_builtin_dwarf_sp_column (void); | |
| 249 extern void expand_builtin_eh_return (tree, tree); | |
| 250 extern void expand_eh_return (void); | |
| 251 extern rtx expand_builtin_extend_pointer (tree); | |
|
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252 |
| 0 | 253 typedef tree (*duplicate_eh_regions_map) (tree, void *); |
|
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254 extern struct pointer_map_t *duplicate_eh_regions |
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255 (struct function *, eh_region, int, duplicate_eh_regions_map, void *); |
| 0 | 256 |
| 257 extern void sjlj_emit_function_exit_after (rtx); | |
|
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258 |
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259 extern eh_region gen_eh_region_cleanup (eh_region); |
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260 extern eh_region gen_eh_region_try (eh_region); |
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261 extern eh_region gen_eh_region_allowed (eh_region, tree); |
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262 extern eh_region gen_eh_region_must_not_throw (eh_region); |
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263 |
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264 extern eh_catch gen_eh_region_catch (eh_region, tree); |
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265 extern eh_landing_pad gen_eh_landing_pad (eh_region); |
| 0 | 266 |
|
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267 extern eh_region get_eh_region_from_number_fn (struct function *, int); |
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268 extern eh_region get_eh_region_from_number (int); |
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269 extern eh_landing_pad get_eh_landing_pad_from_number_fn (struct function*,int); |
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270 extern eh_landing_pad get_eh_landing_pad_from_number (int); |
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271 extern eh_region get_eh_region_from_lp_number_fn (struct function *, int); |
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272 extern eh_region get_eh_region_from_lp_number (int); |
| 0 | 273 |
|
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274 extern eh_region eh_region_outermost (struct function *, eh_region, eh_region); |
| 0 | 275 |
|
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276 extern void make_reg_eh_region_note (rtx insn, int ecf_flags, int lp_nr); |
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277 extern void make_reg_eh_region_note_nothrow_nononlocal (rtx); |
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278 |
| 0 | 279 extern void verify_eh_tree (struct function *); |
| 280 extern void dump_eh_tree (FILE *, struct function *); | |
|
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281 void debug_eh_tree (struct function *); |
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282 extern void add_type_for_runtime (tree); |
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283 extern tree lookup_type_for_runtime (tree); |
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284 extern void assign_filter_values (void); |
| 0 | 285 |
|
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286 extern eh_region get_eh_region_from_rtx (const_rtx); |
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287 extern eh_landing_pad get_eh_landing_pad_from_rtx (const_rtx); |
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288 |
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289 /* If non-NULL, this is a function that returns a function decl to be |
| 0 | 290 executed if an unhandled exception is propagated out of a cleanup |
| 291 region. For example, in C++, an exception thrown by a destructor | |
| 292 during stack unwinding is required to result in a call to | |
| 293 `std::terminate', so the C++ version of this function returns a | |
|
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294 FUNCTION_DECL for `std::terminate'. */ |
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295 extern tree (*lang_protect_cleanup_actions) (void); |
| 0 | 296 |
| 297 /* Return true if type A catches type B. */ | |
| 298 extern int (*lang_eh_type_covers) (tree a, tree b); | |
| 299 | |
| 300 | |
| 301 /* Just because the user configured --with-sjlj-exceptions=no doesn't | |
| 302 mean that we can use call frame exceptions. Detect that the target | |
| 303 has appropriate support. */ | |
| 304 | |
| 305 #ifndef MUST_USE_SJLJ_EXCEPTIONS | |
| 306 # if defined (EH_RETURN_DATA_REGNO) \ | |
| 307 && (defined (TARGET_UNWIND_INFO) \ | |
| 308 || (DWARF2_UNWIND_INFO \ | |
| 309 && (defined (EH_RETURN_HANDLER_RTX) \ | |
| 310 || defined (HAVE_eh_return)))) | |
| 311 # define MUST_USE_SJLJ_EXCEPTIONS 0 | |
| 312 # else | |
| 313 # define MUST_USE_SJLJ_EXCEPTIONS 1 | |
| 314 # endif | |
| 315 #endif | |
| 316 | |
| 317 #ifdef CONFIG_SJLJ_EXCEPTIONS | |
| 318 # if CONFIG_SJLJ_EXCEPTIONS == 1 | |
| 319 # define USING_SJLJ_EXCEPTIONS 1 | |
| 320 # endif | |
| 321 # if CONFIG_SJLJ_EXCEPTIONS == 0 | |
| 322 # define USING_SJLJ_EXCEPTIONS 0 | |
| 323 # if !defined(EH_RETURN_DATA_REGNO) | |
| 324 #error "EH_RETURN_DATA_REGNO required" | |
| 325 # endif | |
| 326 # if ! (defined(TARGET_UNWIND_INFO) || DWARF2_UNWIND_INFO) | |
| 327 #error "{DWARF2,TARGET}_UNWIND_INFO required" | |
| 328 # endif | |
| 329 # if !defined(TARGET_UNWIND_INFO) \ | |
| 330 && !(defined(EH_RETURN_HANDLER_RTX) || defined(HAVE_eh_return)) | |
| 331 #error "EH_RETURN_HANDLER_RTX or eh_return required" | |
| 332 # endif | |
| 333 /* Usually the above error checks will have already triggered an | |
| 334 error, but backends may set MUST_USE_SJLJ_EXCEPTIONS for their own | |
| 335 reasons. */ | |
| 336 # if MUST_USE_SJLJ_EXCEPTIONS | |
| 337 #error "Must use SJLJ exceptions but configured not to" | |
| 338 # endif | |
| 339 # endif | |
| 340 #else | |
| 341 # define USING_SJLJ_EXCEPTIONS MUST_USE_SJLJ_EXCEPTIONS | |
| 342 #endif | |
| 343 | |
|
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344 struct GTY(()) throw_stmt_node { |
| 0 | 345 gimple stmt; |
|
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346 int lp_nr; |
| 0 | 347 }; |
| 348 | |
| 349 extern struct htab *get_eh_throw_stmt_table (struct function *); | |
| 350 extern void set_eh_throw_stmt_table (struct function *, struct htab *); | |
|
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351 |
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352 enum eh_personality_kind { |
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353 eh_personality_none, |
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354 eh_personality_any, |
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355 eh_personality_lang |
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356 }; |
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357 |
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358 extern enum eh_personality_kind |
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359 function_needs_eh_personality (struct function *); |
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360 |
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361 /* Pre-order iteration within the eh_region tree. */ |
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362 |
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363 static inline eh_region |
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364 ehr_next (eh_region r, eh_region start) |
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365 { |
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366 if (r->inner) |
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367 r = r->inner; |
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368 else if (r->next_peer && r != start) |
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369 r = r->next_peer; |
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370 else |
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371 { |
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372 do |
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373 { |
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374 r = r->outer; |
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375 if (r == start) |
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376 return NULL; |
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377 } |
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378 while (r->next_peer == NULL); |
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379 r = r->next_peer; |
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380 } |
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381 return r; |
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382 } |
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383 |
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384 #define FOR_ALL_EH_REGION_AT(R, START) \ |
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385 for ((R) = (START); (R) != NULL; (R) = ehr_next (R, START)) |
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386 |
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387 #define FOR_ALL_EH_REGION_FN(R, FN) \ |
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388 for ((R) = (FN)->eh->region_tree; (R) != NULL; (R) = ehr_next (R, NULL)) |
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389 |
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390 #define FOR_ALL_EH_REGION(R) FOR_ALL_EH_REGION_FN (R, cfun) |