1 /* Code dealing with blocks for GDB. 2 3 Copyright (C) 2003, 2007, 2008, 2009 Free Software Foundation, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 19 20 #ifndef BLOCK_H 21 #define BLOCK_H 22 23 /* Opaque declarations. */ 24 25 struct symbol; 26 struct symtab; 27 struct block_namespace_info; 28 struct using_direct; 29 struct obstack; 30 struct dictionary; 31 struct addrmap; 32 33 /* All of the name-scope contours of the program 34 are represented by `struct block' objects. 35 All of these objects are pointed to by the blockvector. 36 37 Each block represents one name scope. 38 Each lexical context has its own block. 39 40 The blockvector begins with some special blocks. 41 The GLOBAL_BLOCK contains all the symbols defined in this compilation 42 whose scope is the entire program linked together. 43 The STATIC_BLOCK contains all the symbols whose scope is the 44 entire compilation excluding other separate compilations. 45 Blocks starting with the FIRST_LOCAL_BLOCK are not special. 46 47 Each block records a range of core addresses for the code that 48 is in the scope of the block. The STATIC_BLOCK and GLOBAL_BLOCK 49 give, for the range of code, the entire range of code produced 50 by the compilation that the symbol segment belongs to. 51 52 The blocks appear in the blockvector 53 in order of increasing starting-address, 54 and, within that, in order of decreasing ending-address. 55 56 This implies that within the body of one function 57 the blocks appear in the order of a depth-first tree walk. */ 58 59 struct block 60 { 61 62 /* Addresses in the executable code that are in this block. */ 63 64 CORE_ADDR startaddr; 65 CORE_ADDR endaddr; 66 67 /* The symbol that names this block, if the block is the body of a 68 function (real or inlined); otherwise, zero. */ 69 70 struct symbol *function; 71 72 /* The `struct block' for the containing block, or 0 if none. 73 74 The superblock of a top-level local block (i.e. a function in the 75 case of C) is the STATIC_BLOCK. The superblock of the 76 STATIC_BLOCK is the GLOBAL_BLOCK. */ 77 78 struct block *superblock; 79 80 /* This is used to store the symbols in the block. */ 81 82 struct dictionary *dict; 83 84 /* Used for language-specific info. */ 85 86 union 87 { 88 struct 89 { 90 /* Contains information about namespace-related info relevant to 91 this block: using directives and the current namespace 92 scope. */ 93 94 struct block_namespace_info *namespace; 95 } 96 cplus_specific; 97 } 98 language_specific; 99 }; 100 101 #define BLOCK_START(bl) (bl)->startaddr 102 #define BLOCK_END(bl) (bl)->endaddr 103 #define BLOCK_FUNCTION(bl) (bl)->function 104 #define BLOCK_SUPERBLOCK(bl) (bl)->superblock 105 #define BLOCK_DICT(bl) (bl)->dict 106 #define BLOCK_NAMESPACE(bl) (bl)->language_specific.cplus_specific.namespace 107 108 /* Macro to loop through all symbols in a block BL, in no particular 109 order. ITER helps keep track of the iteration, and should be a 110 struct dict_iterator. SYM points to the current symbol. */ 111 112 #define ALL_BLOCK_SYMBOLS(block, iter, sym) \ 113 ALL_DICT_SYMBOLS (BLOCK_DICT (block), iter, sym) 114 115 struct blockvector 116 { 117 /* Number of blocks in the list. */ 118 int nblocks; 119 /* An address map mapping addresses to blocks in this blockvector. 120 This pointer is zero if the blocks' start and end addresses are 121 enough. */ 122 struct addrmap *map; 123 /* The blocks themselves. */ 124 struct block *block[1]; 125 }; 126 127 #define BLOCKVECTOR_NBLOCKS(blocklist) (blocklist)->nblocks 128 #define BLOCKVECTOR_BLOCK(blocklist,n) (blocklist)->block[n] 129 #define BLOCKVECTOR_MAP(blocklist) ((blocklist)->map) 130 131 /* Special block numbers */ 132 133 enum { GLOBAL_BLOCK = 0, STATIC_BLOCK = 1, FIRST_LOCAL_BLOCK = 2 }; 134 135 extern struct symbol *block_linkage_function (const struct block *); 136 137 extern int block_inlined_p (const struct block *block); 138 139 extern int contained_in (const struct block *, const struct block *); 140 141 extern struct blockvector *blockvector_for_pc (CORE_ADDR, struct block **); 142 143 extern struct blockvector *blockvector_for_pc_sect (CORE_ADDR, 144 struct obj_section *, 145 struct block **, 146 struct symtab *); 147 148 extern struct block *block_for_pc (CORE_ADDR); 149 150 extern struct block *block_for_pc_sect (CORE_ADDR, struct obj_section *); 151 152 extern const char *block_scope (const struct block *block); 153 154 extern void block_set_scope (struct block *block, const char *scope, 155 struct obstack *obstack); 156 157 extern struct using_direct *block_using (const struct block *block); 158 159 extern void block_set_using (struct block *block, 160 struct using_direct *using, 161 struct obstack *obstack); 162 163 extern const struct block *block_static_block (const struct block *block); 164 165 extern const struct block *block_global_block (const struct block *block); 166 167 extern struct block *allocate_block (struct obstack *obstack); 168 169 #endif /* BLOCK_H */ 170