Mercurial > hg > CbC > CbC_gcc
annotate gcc/ipa-prop.h @ 108:7ad14f446135
add CbC-example/rectypeTest/
author | Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> |
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date | Thu, 14 Jun 2012 20:30:24 +0900 |
parents | f6334be47118 |
children | 04ced10e8804 |
rev | line source |
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0 | 1 /* Interprocedural analyses. |
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2 Copyright (C) 2005, 2007, 2008, 2009, 2010 |
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3 Free Software Foundation, Inc. |
0 | 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 | |
21 #ifndef IPA_PROP_H | |
22 #define IPA_PROP_H | |
23 | |
24 #include "tree.h" | |
25 #include "vec.h" | |
26 #include "cgraph.h" | |
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27 #include "gimple.h" |
0 | 28 |
29 /* The following definitions and interfaces are used by | |
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30 interprocedural analyses or parameters. */ |
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31 |
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32 /* ipa-prop.c stuff (ipa-cp, indirect inlining): */ |
0 | 33 |
34 /* A jump function for a callsite represents the values passed as actual | |
35 arguments of the callsite. There are three main types of values : | |
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36 |
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37 Pass-through - the caller's formal parameter is passed as an actual |
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38 argument, possibly one simple operation performed on it. |
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39 Constant - a constant (is_gimple_ip_invariant)is passed as an actual |
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40 argument. |
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41 Unknown - neither of the above. |
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42 |
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43 IPA_JF_CONST_MEMBER_PTR stands for C++ member pointers, it is a special |
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44 constant in this regard. Other constants are represented with IPA_JF_CONST. |
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45 |
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46 IPA_JF_ANCESTOR is a special pass-through jump function, which means that |
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47 the result is an address of a part of the object pointed to by the formal |
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48 parameter to which the function refers. It is mainly intended to represent |
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49 getting addresses of of ancestor fields in C++ |
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50 (e.g. &this_1(D)->D.1766.D.1756). Note that if the original pointer is |
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51 NULL, ancestor jump function must behave like a simple pass-through. |
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52 |
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53 Other pass-through functions can either simply pass on an unchanged formal |
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54 parameter or can apply one simple binary operation to it (such jump |
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55 functions are called polynomial). |
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56 |
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57 IPA_JF_KNOWN_TYPE is a special type of an "unknown" function that applies |
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58 only to pointer parameters. It means that even though we cannot prove that |
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59 the passed value is an interprocedural constant, we still know the exact |
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60 type of the containing object which may be valuable for devirtualization. |
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61 |
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62 Jump functions are computed in ipa-prop.c by function |
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63 update_call_notes_after_inlining. Some information can be lost and jump |
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64 functions degraded accordingly when inlining, see |
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65 update_call_notes_after_inlining in the same file. */ |
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66 |
0 | 67 enum jump_func_type |
68 { | |
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69 IPA_JF_UNKNOWN = 0, /* newly allocated and zeroed jump functions default */ |
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70 IPA_JF_KNOWN_TYPE, /* represented by field base_binfo */ |
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71 IPA_JF_CONST, /* represented by field costant */ |
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72 IPA_JF_CONST_MEMBER_PTR, /* represented by field member_cst */ |
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73 IPA_JF_PASS_THROUGH, /* represented by field pass_through */ |
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74 IPA_JF_ANCESTOR /* represented by field ancestor */ |
0 | 75 }; |
76 | |
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77 /* Structure holding data required to describe a pass-through jump function. */ |
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78 |
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79 struct GTY(()) ipa_pass_through_data |
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80 { |
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81 /* If an operation is to be performed on the original parameter, this is the |
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82 second (constant) operand. */ |
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83 tree operand; |
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84 /* Number of the caller's formal parameter being passed. */ |
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85 int formal_id; |
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86 /* Operation that is performed on the argument before it is passed on. |
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87 NOP_EXPR means no operation. Otherwise oper must be a simple binary |
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88 arithmetic operation where the caller's parameter is the first operand and |
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89 operand field from this structure is the second one. */ |
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90 enum tree_code operation; |
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91 }; |
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92 |
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93 /* Structure holding data required to describe an ancestor pass-through |
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94 jump function. */ |
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95 |
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96 struct GTY(()) ipa_ancestor_jf_data |
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97 { |
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98 /* Offset of the field representing the ancestor. */ |
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99 HOST_WIDE_INT offset; |
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100 /* TYpe of the result. */ |
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101 tree type; |
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102 /* Number of the caller's formal parameter being passed. */ |
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103 int formal_id; |
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104 }; |
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105 |
0 | 106 /* Structure holding a C++ member pointer constant. Holds a pointer to the |
107 method and delta offset. */ | |
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108 struct GTY(()) ipa_member_ptr_cst |
0 | 109 { |
110 tree pfn; | |
111 tree delta; | |
112 }; | |
113 | |
114 /* A jump function for a callsite represents the values passed as actual | |
115 arguments of the callsite. See enum jump_func_type for the various | |
116 types of jump functions supported. */ | |
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117 struct GTY (()) ipa_jump_func |
0 | 118 { |
119 enum jump_func_type type; | |
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120 /* Represents a value of a jump function. pass_through is used only in jump |
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121 function context. constant represents the actual constant in constant jump |
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122 functions and member_cst holds constant c++ member functions. */ |
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123 union jump_func_value |
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124 { |
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125 tree GTY ((tag ("IPA_JF_KNOWN_TYPE"))) base_binfo; |
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126 tree GTY ((tag ("IPA_JF_CONST"))) constant; |
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127 struct ipa_member_ptr_cst GTY ((tag ("IPA_JF_CONST_MEMBER_PTR"))) member_cst; |
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128 struct ipa_pass_through_data GTY ((tag ("IPA_JF_PASS_THROUGH"))) pass_through; |
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129 struct ipa_ancestor_jf_data GTY ((tag ("IPA_JF_ANCESTOR"))) ancestor; |
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130 } GTY ((desc ("%1.type"))) value; |
0 | 131 }; |
132 | |
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133 /* All formal parameters in the program have a lattice associated with it |
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134 computed by the interprocedural stage of IPCP. |
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135 There are three main values of the lattice: |
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136 IPA_TOP - unknown, |
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137 IPA_BOTTOM - variable, |
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138 IPA_CONST_VALUE - simple scalar constant, |
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139 |
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140 We also use this type to propagate types accross the call graph for the |
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141 purpose of devirtualization. In that case, IPA_CONST_VALUE denotes a known |
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142 type, rather than a constant. */ |
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143 enum ipa_lattice_type |
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144 { |
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145 IPA_BOTTOM, |
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146 IPA_CONST_VALUE, |
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147 IPA_TOP |
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148 }; |
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149 |
0 | 150 /* All formal parameters in the program have a cval computed by |
151 the interprocedural stage of IPCP. See enum ipa_lattice_type for | |
152 the various types of lattices supported */ | |
153 struct ipcp_lattice | |
154 { | |
155 enum ipa_lattice_type type; | |
156 tree constant; | |
157 }; | |
158 | |
159 /* Structure describing a single formal parameter. */ | |
160 struct ipa_param_descriptor | |
161 { | |
162 /* IPA-CP lattice. */ | |
163 struct ipcp_lattice ipcp_lattice; | |
164 /* PARAM_DECL of this parameter. */ | |
165 tree decl; | |
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166 /* Vector of BINFOs of types that this argument might encounter. NULL |
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167 basically means a top value, bottom is marked by the cannot_devirtualize |
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168 flag below.*/ |
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169 VEC (tree, heap) *types; |
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170 /* The parameter is used. */ |
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171 unsigned used : 1; |
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172 /* Set when parameter type cannot be used for devirtualization. */ |
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173 unsigned cannot_devirtualize : 1; |
0 | 174 }; |
175 | |
176 /* ipa_node_params stores information related to formal parameters of functions | |
177 and some other information for interprocedural passes that operate on | |
178 parameters (such as ipa-cp). */ | |
179 struct ipa_node_params | |
180 { | |
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181 /* Number of formal parameters of this function. When set to 0, this |
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182 function's parameters would not be analyzed by IPA CP. */ |
0 | 183 int param_count; |
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184 /* Whether this function is called with variable number of actual |
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185 arguments. */ |
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186 unsigned called_with_var_arguments : 1; |
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187 /* Whether the param uses analysis has already been performed. */ |
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188 unsigned uses_analysis_done : 1; |
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189 /* Whether the function is enqueued in an ipa_func_list. */ |
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190 unsigned node_enqueued : 1; |
0 | 191 /* Pointer to an array of structures describing individual formal |
192 parameters. */ | |
193 struct ipa_param_descriptor *params; | |
194 /* Only for versioned nodes this field would not be NULL, | |
195 it points to the node that IPA cp cloned from. */ | |
196 struct cgraph_node *ipcp_orig_node; | |
197 /* Meaningful only for original functions. Expresses the | |
198 ratio between the direct calls and sum of all invocations of | |
199 this function (given by profiling info). It is used to calculate | |
200 the profiling information of the original function and the versioned | |
201 one. */ | |
202 gcov_type count_scale; | |
203 }; | |
204 | |
205 /* ipa_node_params access functions. Please use these to access fields that | |
206 are or will be shared among various passes. */ | |
207 | |
208 /* Set the number of formal parameters. */ | |
209 | |
210 static inline void | |
211 ipa_set_param_count (struct ipa_node_params *info, int count) | |
212 { | |
213 info->param_count = count; | |
214 } | |
215 | |
216 /* Return the number of formal parameters. */ | |
217 | |
218 static inline int | |
219 ipa_get_param_count (struct ipa_node_params *info) | |
220 { | |
221 return info->param_count; | |
222 } | |
223 | |
224 /* Return the declaration of Ith formal parameter of the function corresponding | |
225 to INFO. Note there is no setter function as this array is built just once | |
226 using ipa_initialize_node_params. */ | |
227 | |
228 static inline tree | |
229 ipa_get_param (struct ipa_node_params *info, int i) | |
230 { | |
231 return info->params[i].decl; | |
232 } | |
233 | |
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234 /* Return the used flag corresponding to the Ith formal parameter of |
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235 the function associated with INFO. */ |
0 | 236 |
237 static inline bool | |
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238 ipa_is_param_used (struct ipa_node_params *info, int i) |
0 | 239 { |
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240 return info->params[i].used; |
0 | 241 } |
242 | |
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243 /* Return the cannot_devirtualize flag corresponding to the Ith formal |
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244 parameter of the function associated with INFO. The corresponding function |
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245 to set the flag is ipa_set_param_cannot_devirtualize. */ |
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246 |
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247 static inline bool |
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248 ipa_param_cannot_devirtualize_p (struct ipa_node_params *info, int i) |
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249 { |
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250 return info->params[i].cannot_devirtualize; |
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251 } |
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252 |
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253 /* Return true iff the vector of possible types of the Ith formal parameter of |
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254 the function associated with INFO is empty. */ |
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255 |
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256 static inline bool |
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257 ipa_param_types_vec_empty (struct ipa_node_params *info, int i) |
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258 { |
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259 return info->params[i].types == NULL; |
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260 } |
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261 |
0 | 262 /* Flag this node as having callers with variable number of arguments. */ |
263 | |
264 static inline void | |
265 ipa_set_called_with_variable_arg (struct ipa_node_params *info) | |
266 { | |
267 info->called_with_var_arguments = 1; | |
268 } | |
269 | |
270 /* Have we detected this node was called with variable number of arguments? */ | |
271 | |
272 static inline bool | |
273 ipa_is_called_with_var_arguments (struct ipa_node_params *info) | |
274 { | |
275 return info->called_with_var_arguments; | |
276 } | |
277 | |
278 | |
279 | |
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280 /* ipa_edge_args stores information related to a callsite and particularly its |
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281 arguments. It can be accessed by the IPA_EDGE_REF macro. */ |
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282 typedef struct GTY(()) ipa_edge_args |
0 | 283 { |
284 /* Number of actual arguments in this callsite. When set to 0, | |
285 this callsite's parameters would not be analyzed by the different | |
286 stages of IPA CP. */ | |
287 int argument_count; | |
288 /* Array of the callsite's jump function of each parameter. */ | |
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289 struct ipa_jump_func GTY ((length ("%h.argument_count"))) *jump_functions; |
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290 } ipa_edge_args_t; |
0 | 291 |
292 /* ipa_edge_args access functions. Please use these to access fields that | |
293 are or will be shared among various passes. */ | |
294 | |
295 /* Set the number of actual arguments. */ | |
296 | |
297 static inline void | |
298 ipa_set_cs_argument_count (struct ipa_edge_args *args, int count) | |
299 { | |
300 args->argument_count = count; | |
301 } | |
302 | |
303 /* Return the number of actual arguments. */ | |
304 | |
305 static inline int | |
306 ipa_get_cs_argument_count (struct ipa_edge_args *args) | |
307 { | |
308 return args->argument_count; | |
309 } | |
310 | |
311 /* Returns a pointer to the jump function for the ith argument. Please note | |
312 there is no setter function as jump functions are all set up in | |
313 ipa_compute_jump_functions. */ | |
314 | |
315 static inline struct ipa_jump_func * | |
316 ipa_get_ith_jump_func (struct ipa_edge_args *args, int i) | |
317 { | |
318 return &args->jump_functions[i]; | |
319 } | |
320 | |
321 /* Vectors need to have typedefs of structures. */ | |
322 typedef struct ipa_node_params ipa_node_params_t; | |
323 | |
324 /* Types of vectors holding the infos. */ | |
325 DEF_VEC_O (ipa_node_params_t); | |
326 DEF_VEC_ALLOC_O (ipa_node_params_t, heap); | |
327 DEF_VEC_O (ipa_edge_args_t); | |
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328 DEF_VEC_ALLOC_O (ipa_edge_args_t, gc); |
0 | 329 |
330 /* Vector where the parameter infos are actually stored. */ | |
331 extern VEC (ipa_node_params_t, heap) *ipa_node_params_vector; | |
332 /* Vector where the parameter infos are actually stored. */ | |
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333 extern GTY(()) VEC (ipa_edge_args_t, gc) *ipa_edge_args_vector; |
0 | 334 |
335 /* Return the associated parameter/argument info corresponding to the given | |
336 node/edge. */ | |
337 #define IPA_NODE_REF(NODE) (VEC_index (ipa_node_params_t, \ | |
338 ipa_node_params_vector, (NODE)->uid)) | |
339 #define IPA_EDGE_REF(EDGE) (VEC_index (ipa_edge_args_t, \ | |
340 ipa_edge_args_vector, (EDGE)->uid)) | |
341 /* This macro checks validity of index returned by | |
342 ipa_get_param_decl_index function. */ | |
343 #define IS_VALID_JUMP_FUNC_INDEX(I) ((I) != -1) | |
344 | |
345 /* Creating and freeing ipa_node_params and ipa_edge_args. */ | |
346 void ipa_create_all_node_params (void); | |
347 void ipa_create_all_edge_args (void); | |
348 void ipa_free_edge_args_substructures (struct ipa_edge_args *); | |
349 void ipa_free_node_params_substructures (struct ipa_node_params *); | |
350 void ipa_free_all_node_params (void); | |
351 void ipa_free_all_edge_args (void); | |
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352 void ipa_create_all_structures_for_iinln (void); |
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353 void ipa_free_all_structures_after_ipa_cp (void); |
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354 void ipa_free_all_structures_after_iinln (void); |
0 | 355 void ipa_register_cgraph_hooks (void); |
356 | |
357 /* This function ensures the array of node param infos is big enough to | |
358 accommodate a structure for all nodes and reallocates it if not. */ | |
359 | |
360 static inline void | |
361 ipa_check_create_node_params (void) | |
362 { | |
363 if (!ipa_node_params_vector) | |
364 ipa_node_params_vector = VEC_alloc (ipa_node_params_t, heap, | |
365 cgraph_max_uid); | |
366 | |
367 if (VEC_length (ipa_node_params_t, ipa_node_params_vector) | |
368 <= (unsigned) cgraph_max_uid) | |
369 VEC_safe_grow_cleared (ipa_node_params_t, heap, | |
370 ipa_node_params_vector, cgraph_max_uid + 1); | |
371 } | |
372 | |
373 /* This function ensures the array of edge arguments infos is big enough to | |
374 accommodate a structure for all edges and reallocates it if not. */ | |
375 | |
376 static inline void | |
377 ipa_check_create_edge_args (void) | |
378 { | |
379 if (!ipa_edge_args_vector) | |
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380 ipa_edge_args_vector = VEC_alloc (ipa_edge_args_t, gc, |
0 | 381 cgraph_edge_max_uid); |
382 | |
383 if (VEC_length (ipa_edge_args_t, ipa_edge_args_vector) | |
384 <= (unsigned) cgraph_edge_max_uid) | |
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385 VEC_safe_grow_cleared (ipa_edge_args_t, gc, ipa_edge_args_vector, |
0 | 386 cgraph_edge_max_uid + 1); |
387 } | |
388 | |
389 /* Returns true if the array of edge infos is large enough to accommodate an | |
390 info for EDGE. The main purpose of this function is that debug dumping | |
391 function can check info availability without causing reallocations. */ | |
392 | |
393 static inline bool | |
394 ipa_edge_args_info_available_for_edge_p (struct cgraph_edge *edge) | |
395 { | |
396 return ((unsigned) edge->uid < VEC_length (ipa_edge_args_t, | |
397 ipa_edge_args_vector)); | |
398 } | |
399 | |
400 /* A function list element. It is used to create a temporary worklist used in | |
401 the propagation stage of IPCP. (can be used for more IPA optimizations) */ | |
402 struct ipa_func_list | |
403 { | |
404 struct cgraph_node *node; | |
405 struct ipa_func_list *next; | |
406 }; | |
407 | |
408 /* ipa_func_list interface. */ | |
409 struct ipa_func_list *ipa_init_func_list (void); | |
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410 void ipa_push_func_to_list_1 (struct ipa_func_list **, struct cgraph_node *, |
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411 struct ipa_node_params *); |
0 | 412 struct cgraph_node *ipa_pop_func_from_list (struct ipa_func_list **); |
413 | |
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414 /* Add cgraph NODE to the worklist WL if it is not already in one. */ |
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415 |
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416 static inline void |
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417 ipa_push_func_to_list (struct ipa_func_list **wl, struct cgraph_node *node) |
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418 { |
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419 struct ipa_node_params *info = IPA_NODE_REF (node); |
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420 |
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421 if (!info->node_enqueued) |
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422 ipa_push_func_to_list_1 (wl, node, info); |
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423 } |
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424 |
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425 void ipa_analyze_node (struct cgraph_node *); |
0 | 426 |
427 /* Function formal parameters related computations. */ | |
428 void ipa_initialize_node_params (struct cgraph_node *node); | |
429 bool ipa_propagate_indirect_call_infos (struct cgraph_edge *cs, | |
430 VEC (cgraph_edge_p, heap) **new_edges); | |
431 | |
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432 /* Indirect edge and binfo processing. */ |
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433 struct cgraph_edge *ipa_make_edge_direct_to_target (struct cgraph_edge *, tree, |
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434 tree); |
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435 |
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436 |
0 | 437 /* Debugging interface. */ |
438 void ipa_print_node_params (FILE *, struct cgraph_node *node); | |
439 void ipa_print_all_params (FILE *); | |
440 void ipa_print_node_jump_functions (FILE *f, struct cgraph_node *node); | |
441 void ipa_print_all_jump_functions (FILE * f); | |
442 | |
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443 /* Structure to describe transformations of formal parameters and actual |
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444 arguments. Each instance describes one new parameter and they are meant to |
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445 be stored in a vector. Additionally, most users will probably want to store |
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446 adjustments about parameters that are being removed altogether so that SSA |
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447 names belonging to them can be replaced by SSA names of an artificial |
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448 variable. */ |
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449 struct ipa_parm_adjustment |
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450 { |
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451 /* The original PARM_DECL itself, helpful for processing of the body of the |
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452 function itself. Intended for traversing function bodies. |
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453 ipa_modify_formal_parameters, ipa_modify_call_arguments and |
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454 ipa_combine_adjustments ignore this and use base_index. |
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455 ipa_modify_formal_parameters actually sets this. */ |
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456 tree base; |
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457 |
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458 /* Type of the new parameter. However, if by_ref is true, the real type will |
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459 be a pointer to this type. */ |
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460 tree type; |
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461 |
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462 /* Alias refrerence type to be used in MEM_REFs when adjusting caller |
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463 arguments. */ |
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464 tree alias_ptr_type; |
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465 |
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466 /* The new declaration when creating/replacing a parameter. Created by |
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467 ipa_modify_formal_parameters, useful for functions modifying the body |
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468 accordingly. */ |
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469 tree reduction; |
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470 |
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471 /* New declaration of a substitute variable that we may use to replace all |
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472 non-default-def ssa names when a parm decl is going away. */ |
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473 tree new_ssa_base; |
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474 |
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475 /* If non-NULL and the original parameter is to be removed (copy_param below |
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476 is NULL), this is going to be its nonlocalized vars value. */ |
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477 tree nonlocal_value; |
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478 |
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479 /* Offset into the original parameter (for the cases when the new parameter |
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480 is a component of an original one). */ |
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481 HOST_WIDE_INT offset; |
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482 |
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483 /* Zero based index of the original parameter this one is based on. (ATM |
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484 there is no way to insert a new parameter out of the blue because there is |
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485 no need but if it arises the code can be easily exteded to do so.) */ |
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486 int base_index; |
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487 |
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488 /* This new parameter is an unmodified parameter at index base_index. */ |
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489 unsigned copy_param : 1; |
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490 |
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491 /* This adjustment describes a parameter that is about to be removed |
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492 completely. Most users will probably need to book keep those so that they |
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493 don't leave behinfd any non default def ssa names belonging to them. */ |
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494 unsigned remove_param : 1; |
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495 |
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496 /* The parameter is to be passed by reference. */ |
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497 unsigned by_ref : 1; |
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498 }; |
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499 |
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500 typedef struct ipa_parm_adjustment ipa_parm_adjustment_t; |
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501 DEF_VEC_O (ipa_parm_adjustment_t); |
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502 DEF_VEC_ALLOC_O (ipa_parm_adjustment_t, heap); |
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503 |
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504 typedef VEC (ipa_parm_adjustment_t, heap) *ipa_parm_adjustment_vec; |
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505 |
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506 VEC(tree, heap) *ipa_get_vector_of_formal_parms (tree fndecl); |
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507 void ipa_modify_formal_parameters (tree fndecl, ipa_parm_adjustment_vec, |
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508 const char *); |
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509 void ipa_modify_call_arguments (struct cgraph_edge *, gimple, |
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510 ipa_parm_adjustment_vec); |
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511 ipa_parm_adjustment_vec ipa_combine_adjustments (ipa_parm_adjustment_vec, |
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512 ipa_parm_adjustment_vec); |
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513 void ipa_dump_param_adjustments (FILE *, ipa_parm_adjustment_vec, tree); |
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514 |
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515 void ipa_prop_write_jump_functions (cgraph_node_set set); |
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516 void ipa_prop_read_jump_functions (void); |
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517 void ipa_update_after_lto_read (void); |
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518 |
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519 /* From tree-sra.c: */ |
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520 tree build_ref_for_offset (location_t, tree, HOST_WIDE_INT, tree, |
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521 gimple_stmt_iterator *, bool); |
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522 |
0 | 523 #endif /* IPA_PROP_H */ |