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comparison gcc/ipa-prop.h @ 63:b7f97abdc517 gcc-4.6-20100522

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update gcc from gcc-4.5.0 to gcc-4.6
author ryoma <e075725@ie.u-ryukyu.ac.jp>
date Mon, 24 May 2010 12:47:05 +0900
parents 77e2b8dfacca
children f6334be47118
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56:3c8a44c06a95 63:b7f97abdc517
1 /* Interprocedural analyses. 1 /* Interprocedural analyses.
2 Copyright (C) 2005, 2007, 2008 Free Software Foundation, Inc. 2 Copyright (C) 2005, 2007, 2008, 2009
3 Free Software Foundation, Inc.
3 4
4 This file is part of GCC. 5 This file is part of GCC.
5 6
6 GCC is free software; you can redistribute it and/or modify it under 7 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free 8 the terms of the GNU General Public License as published by the Free
36 argument, possibly one simple operation performed on it. 37 argument, possibly one simple operation performed on it.
37 Constant - a constant (is_gimple_ip_invariant)is passed as an actual 38 Constant - a constant (is_gimple_ip_invariant)is passed as an actual
38 argument. 39 argument.
39 Unknown - neither of the above. 40 Unknown - neither of the above.
40 41
41 IPA_JF_CONST_MEMBER_PTR stands for C++ member pointers, other constants are 42 IPA_JF_CONST_MEMBER_PTR stands for C++ member pointers, it is a special
42 represented with IPA_JF_CONST. 43 constant in this regard. Other constants are represented with IPA_JF_CONST.
43 44
44 In addition to "ordinary" pass through functions represented by 45 IPA_JF_ANCESTOR is a special pass-through jump function, which means that
45 IPA_JF_PASS_THROUGH, IPA_JF_ANCESTOR represents getting addresses of of 46 the result is an address of a part of the object pointed to by the formal
46 ancestor fields in C++ (e.g. &this_1(D)->D.1766.D.1756). */ 47 parameter to which the function refers. It is mainly intended to represent
48 getting addresses of of ancestor fields in C++
49 (e.g. &this_1(D)->D.1766.D.1756). Note that if the original pointer is
50 NULL, ancestor jump function must behave like a simple pass-through.
51
52 Other pass-through functions can either simply pass on an unchanged formal
53 parameter or can apply one simple binary operation to it (such jump
54 functions are called polynomial).
55
56 IPA_JF_KNOWN_TYPE is a special type of an "unknown" function that applies
57 only to pointer parameters. It means that even though we cannot prove that
58 the passed value is an interprocedural constant, we still know the exact
59 type of the containing object which may be valuable for devirtualization.
60
61 Jump functions are computed in ipa-prop.c by function
62 update_call_notes_after_inlining. Some information can be lost and jump
63 functions degraded accordingly when inlining, see
64 update_call_notes_after_inlining in the same file. */
65
47 enum jump_func_type 66 enum jump_func_type
48 { 67 {
49 IPA_JF_UNKNOWN = 0, /* newly allocated and zeroed jump functions default */ 68 IPA_JF_UNKNOWN = 0, /* newly allocated and zeroed jump functions default */
50 IPA_JF_CONST, 69 IPA_JF_KNOWN_TYPE, /* represented by field base_binfo */
51 IPA_JF_CONST_MEMBER_PTR, 70 IPA_JF_CONST, /* represented by field costant */
52 IPA_JF_PASS_THROUGH, 71 IPA_JF_CONST_MEMBER_PTR, /* represented by field member_cst */
53 IPA_JF_ANCESTOR 72 IPA_JF_PASS_THROUGH, /* represented by field pass_through */
73 IPA_JF_ANCESTOR /* represented by field ancestor */
74 };
75
76 /* Structure holding data required to describe a pass-through jump function. */
77
78 struct GTY(()) ipa_pass_through_data
79 {
80 /* If an operation is to be performed on the original parameter, this is the
81 second (constant) operand. */
82 tree operand;
83 /* Number of the caller's formal parameter being passed. */
84 int formal_id;
85 /* Operation that is performed on the argument before it is passed on.
86 NOP_EXPR means no operation. Otherwise oper must be a simple binary
87 arithmetic operation where the caller's parameter is the first operand and
88 operand field from this structure is the second one. */
89 enum tree_code operation;
90 };
91
92 /* Structure holding data required to describe an ancestor pass-through
93 jump function. */
94
95 struct GTY(()) ipa_ancestor_jf_data
96 {
97 /* Offset of the field representing the ancestor. */
98 HOST_WIDE_INT offset;
99 /* TYpe of the result. */
100 tree type;
101 /* Number of the caller's formal parameter being passed. */
102 int formal_id;
103 };
104
105 /* Structure holding a C++ member pointer constant. Holds a pointer to the
106 method and delta offset. */
107 struct GTY(()) ipa_member_ptr_cst
108 {
109 tree pfn;
110 tree delta;
111 };
112
113 /* A jump function for a callsite represents the values passed as actual
114 arguments of the callsite. See enum jump_func_type for the various
115 types of jump functions supported. */
116 struct GTY (()) ipa_jump_func
117 {
118 enum jump_func_type type;
119 /* Represents a value of a jump function. pass_through is used only in jump
120 function context. constant represents the actual constant in constant jump
121 functions and member_cst holds constant c++ member functions. */
122 union jump_func_value
123 {
124 tree GTY ((tag ("IPA_JF_KNOWN_TYPE"))) base_binfo;
125 tree GTY ((tag ("IPA_JF_CONST"))) constant;
126 struct ipa_member_ptr_cst GTY ((tag ("IPA_JF_CONST_MEMBER_PTR"))) member_cst;
127 struct ipa_pass_through_data GTY ((tag ("IPA_JF_PASS_THROUGH"))) pass_through;
128 struct ipa_ancestor_jf_data GTY ((tag ("IPA_JF_ANCESTOR"))) ancestor;
129 } GTY ((desc ("%1.type"))) value;
54 }; 130 };
55 131
56 /* All formal parameters in the program have a lattice associated with it 132 /* All formal parameters in the program have a lattice associated with it
57 computed by the interprocedural stage of IPCP. 133 computed by the interprocedural stage of IPCP.
58 There are three main values of the lattice: 134 There are three main values of the lattice:
67 IPA_BOTTOM, 143 IPA_BOTTOM,
68 IPA_CONST_VALUE, 144 IPA_CONST_VALUE,
69 IPA_TOP 145 IPA_TOP
70 }; 146 };
71 147
72
73 /* Structure holding data required to describe a pass-through jump function. */
74
75 struct GTY(()) ipa_pass_through_data
76 {
77 /* If an operation is to be performed on the original parameter, this is the
78 second (constant) operand. */
79 tree operand;
80 /* Number of the caller's formal parameter being passed. */
81 int formal_id;
82 /* Operation that is performed on the argument before it is passed on.
83 NOP_EXPR means no operation. Otherwise oper must be a simple binary
84 arithmetic operation where the caller's parameter is the first operand and
85 operand field from this structure is the second one. */
86 enum tree_code operation;
87 };
88
89 /* Structure holding data required to describe and ancestor pass throu
90 funkci. */
91
92 struct GTY(()) ipa_ancestor_jf_data
93 {
94 /* Offset of the field representing the ancestor. */
95 HOST_WIDE_INT offset;
96 /* TYpe of the result. */
97 tree type;
98 /* Number of the caller's formal parameter being passed. */
99 int formal_id;
100 };
101
102 /* Structure holding a C++ member pointer constant. Holds a pointer to the
103 method and delta offset. */
104 struct GTY(()) ipa_member_ptr_cst
105 {
106 tree pfn;
107 tree delta;
108 };
109
110 /* A jump function for a callsite represents the values passed as actual
111 arguments of the callsite. See enum jump_func_type for the various
112 types of jump functions supported. */
113 struct GTY (()) ipa_jump_func
114 {
115 enum jump_func_type type;
116 /* Represents a value of a jump function. pass_through is used only in jump
117 function context. constant represents the actual constant in constant jump
118 functions and member_cst holds constant c++ member functions. */
119 union jump_func_value
120 {
121 tree GTY ((tag ("IPA_JF_CONST"))) constant;
122 struct ipa_pass_through_data GTY ((tag ("IPA_JF_PASS_THROUGH"))) pass_through;
123 struct ipa_ancestor_jf_data GTY ((tag ("IPA_JF_ANCESTOR"))) ancestor;
124 struct ipa_member_ptr_cst GTY ((tag ("IPA_JF_CONST_MEMBER_PTR"))) member_cst;
125 } GTY ((desc ("%1.type"))) value;
126 };
127
128 /* All formal parameters in the program have a cval computed by 148 /* All formal parameters in the program have a cval computed by
129 the interprocedural stage of IPCP. See enum ipa_lattice_type for 149 the interprocedural stage of IPCP. See enum ipa_lattice_type for
130 the various types of lattices supported */ 150 the various types of lattices supported */
131 struct ipcp_lattice 151 struct ipcp_lattice
132 { 152 {
133 enum ipa_lattice_type type; 153 enum ipa_lattice_type type;
134 tree constant; 154 tree constant;
135 };
136
137 /* Each instance of the following structure describes a statement that calls a
138 function parameter. Those referring to statements within the same function
139 are linked in a list. */
140 struct ipa_param_call_note
141 {
142 /* Expected number of executions: calculated in profile.c. */
143 gcov_type count;
144 /* Linked list's next */
145 struct ipa_param_call_note *next;
146 /* Statement that contains the call to the parameter above. */
147 gimple stmt;
148 /* When in LTO, we the above stmt will be NULL and we need an uid. */
149 unsigned int lto_stmt_uid;
150 /* Index of the parameter that is called. */
151 int formal_id;
152 /* Expected frequency of executions within the function. see cgraph_edge in
153 cgraph.h for more on this. */
154 int frequency;
155 /* Depth of loop nest, 1 means no loop nest. */
156 unsigned short int loop_nest;
157 /* Set when we have already found the target to be a compile time constant
158 and turned this into an edge or when the note was found unusable for some
159 reason. */
160 bool processed;
161 }; 155 };
162 156
163 /* Structure describing a single formal parameter. */ 157 /* Structure describing a single formal parameter. */
164 struct ipa_param_descriptor 158 struct ipa_param_descriptor
165 { 159 {
167 struct ipcp_lattice ipcp_lattice; 161 struct ipcp_lattice ipcp_lattice;
168 /* PARAM_DECL of this parameter. */ 162 /* PARAM_DECL of this parameter. */
169 tree decl; 163 tree decl;
170 /* Whether the value parameter has been modified within the function. */ 164 /* Whether the value parameter has been modified within the function. */
171 unsigned modified : 1; 165 unsigned modified : 1;
172 /* Whether the parameter has been used as a call destination. */ 166 /* The parameter is used. */
173 unsigned called : 1; 167 unsigned used : 1;
174 }; 168 };
175 169
176 /* ipa_node_params stores information related to formal parameters of functions 170 /* ipa_node_params stores information related to formal parameters of functions
177 and some other information for interprocedural passes that operate on 171 and some other information for interprocedural passes that operate on
178 parameters (such as ipa-cp). */ 172 parameters (such as ipa-cp). */
180 { 174 {
181 /* Number of formal parameters of this function. When set to 0, 175 /* Number of formal parameters of this function. When set to 0,
182 this function's parameters would not be analyzed by the different 176 this function's parameters would not be analyzed by the different
183 stages of IPA CP. */ 177 stages of IPA CP. */
184 int param_count; 178 int param_count;
179 /* Whether this function is called with variable number of actual
180 arguments. */
181 unsigned called_with_var_arguments : 1;
182 /* Whether the modification analysis has already been performed. */
183 unsigned modification_analysis_done : 1;
184 /* Whether the param uses analysis has already been performed. */
185 unsigned uses_analysis_done : 1;
186 /* Whether the function is enqueued in an ipa_func_list. */
187 unsigned node_enqueued : 1;
185 /* Pointer to an array of structures describing individual formal 188 /* Pointer to an array of structures describing individual formal
186 parameters. */ 189 parameters. */
187 struct ipa_param_descriptor *params; 190 struct ipa_param_descriptor *params;
188 /* List of structures enumerating calls to a formal parameter. */
189 struct ipa_param_call_note *param_calls;
190 /* Only for versioned nodes this field would not be NULL, 191 /* Only for versioned nodes this field would not be NULL,
191 it points to the node that IPA cp cloned from. */ 192 it points to the node that IPA cp cloned from. */
192 struct cgraph_node *ipcp_orig_node; 193 struct cgraph_node *ipcp_orig_node;
193 /* Meaningful only for original functions. Expresses the 194 /* Meaningful only for original functions. Expresses the
194 ratio between the direct calls and sum of all invocations of 195 ratio between the direct calls and sum of all invocations of
195 this function (given by profiling info). It is used to calculate 196 this function (given by profiling info). It is used to calculate
196 the profiling information of the original function and the versioned 197 the profiling information of the original function and the versioned
197 one. */ 198 one. */
198 gcov_type count_scale; 199 gcov_type count_scale;
199
200 /* Whether this function is called with variable number of actual
201 arguments. */
202 unsigned called_with_var_arguments : 1;
203 /* Whether the modification analysis has already been performed. */
204 unsigned modification_analysis_done : 1;
205 /* Whether the param uses analysis has already been performed. */
206 unsigned uses_analysis_done : 1;
207 /* Whether the function is enqueued in an ipa_func_list. */
208 unsigned node_enqueued : 1;
209 }; 200 };
210 201
211 /* ipa_node_params access functions. Please use these to access fields that 202 /* ipa_node_params access functions. Please use these to access fields that
212 are or will be shared among various passes. */ 203 are or will be shared among various passes. */
213 204
246 ipa_is_param_modified (struct ipa_node_params *info, int i) 237 ipa_is_param_modified (struct ipa_node_params *info, int i)
247 { 238 {
248 return info->params[i].modified; 239 return info->params[i].modified;
249 } 240 }
250 241
251 /* Return the called flag corresponding to the Ith formal parameter of the 242 /* Return the used flag corresponding to the Ith formal parameter of
252 function associated with INFO. Note that there is no setter method as the 243 the function associated with INFO. */
253 goal is to set all flags when building the array in
254 ipa_detect_called_params. */
255 244
256 static inline bool 245 static inline bool
257 ipa_is_param_called (struct ipa_node_params *info, int i) 246 ipa_is_param_used (struct ipa_node_params *info, int i)
258 { 247 {
259 return info->params[i].called; 248 return info->params[i].used;
260 } 249 }
261 250
262 /* Flag this node as having callers with variable number of arguments. */ 251 /* Flag this node as having callers with variable number of arguments. */
263 252
264 static inline void 253 static inline void
348 void ipa_create_all_edge_args (void); 337 void ipa_create_all_edge_args (void);
349 void ipa_free_edge_args_substructures (struct ipa_edge_args *); 338 void ipa_free_edge_args_substructures (struct ipa_edge_args *);
350 void ipa_free_node_params_substructures (struct ipa_node_params *); 339 void ipa_free_node_params_substructures (struct ipa_node_params *);
351 void ipa_free_all_node_params (void); 340 void ipa_free_all_node_params (void);
352 void ipa_free_all_edge_args (void); 341 void ipa_free_all_edge_args (void);
353 void free_all_ipa_structures_after_ipa_cp (void); 342 void ipa_create_all_structures_for_iinln (void);
354 void free_all_ipa_structures_after_iinln (void); 343 void ipa_free_all_structures_after_ipa_cp (void);
344 void ipa_free_all_structures_after_iinln (void);
355 void ipa_register_cgraph_hooks (void); 345 void ipa_register_cgraph_hooks (void);
356 346
357 /* This function ensures the array of node param infos is big enough to 347 /* 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. */ 348 accommodate a structure for all nodes and reallocates it if not. */
359 349
421 if (!info->node_enqueued) 411 if (!info->node_enqueued)
422 ipa_push_func_to_list_1 (wl, node, info); 412 ipa_push_func_to_list_1 (wl, node, info);
423 } 413 }
424 414
425 /* Callsite related calculations. */ 415 /* Callsite related calculations. */
426 void ipa_compute_jump_functions (struct cgraph_edge *); 416 void ipa_compute_jump_functions (struct cgraph_node *);
427 void ipa_count_arguments (struct cgraph_edge *); 417 void ipa_count_arguments (struct cgraph_edge *);
428 418
429 /* Function formal parameters related computations. */ 419 /* Function formal parameters related computations. */
430 void ipa_initialize_node_params (struct cgraph_node *node); 420 void ipa_initialize_node_params (struct cgraph_node *node);
431 void ipa_detect_param_modifications (struct cgraph_node *); 421 void ipa_detect_param_modifications (struct cgraph_node *);
508 void ipa_dump_param_adjustments (FILE *, ipa_parm_adjustment_vec, tree); 498 void ipa_dump_param_adjustments (FILE *, ipa_parm_adjustment_vec, tree);
509 499
510 void ipa_prop_write_jump_functions (cgraph_node_set set); 500 void ipa_prop_write_jump_functions (cgraph_node_set set);
511 void ipa_prop_read_jump_functions (void); 501 void ipa_prop_read_jump_functions (void);
512 void ipa_update_after_lto_read (void); 502 void ipa_update_after_lto_read (void);
513 void lto_ipa_fixup_call_notes (struct cgraph_node *, gimple *);
514 503
515 /* From tree-sra.c: */ 504 /* From tree-sra.c: */
516 bool build_ref_for_offset (tree *, tree, HOST_WIDE_INT, tree, bool); 505 bool build_ref_for_offset (tree *, tree, HOST_WIDE_INT, tree, bool);
517 506
518 #endif /* IPA_PROP_H */ 507 #endif /* IPA_PROP_H */