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6d77ee89 BK |
1 | /* This file contains the definitions and documentation for the |
2 | tree codes used in the GNU C compiler. | |
b4e3fabb RK |
3 | Copyright (C) 1987, 1988, 1993, 1995, 1997, 1998, 2000, 2001 |
4 | Free Software Foundation, Inc. | |
6d77ee89 | 5 | |
1322177d | 6 | This file is part of GCC. |
6d77ee89 | 7 | |
1322177d LB |
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 2, or (at your option) any later | |
11 | version. | |
6d77ee89 | 12 | |
1322177d LB |
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. | |
6d77ee89 BK |
17 | |
18 | You should have received a copy of the GNU General Public License | |
1322177d LB |
19 | along with GCC; see the file COPYING. If not, write to the Free |
20 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
21 | 02111-1307, USA. */ | |
6d77ee89 BK |
22 | |
23 | ||
24 | /* The third argument can be: | |
cba734ea JL |
25 | 'x' for an exceptional code (fits no category). |
26 | 't' for a type object code. | |
27 | 'b' for a lexical block. | |
28 | 'c' for codes for constants. | |
29 | 'd' for codes for declarations (also serving as variable refs). | |
30 | 'r' for codes for references to storage. | |
31 | '<' for codes for comparison expressions. | |
32 | '1' for codes for unary arithmetic expressions. | |
33 | '2' for codes for binary arithmetic expressions. | |
34 | 's' for codes for expressions with inherent side effects. | |
35 | 'e' for codes for other kinds of expressions. */ | |
6d77ee89 BK |
36 | |
37 | /* For `r', `e', `<', `1', `2', `s' and `x' nodes, | |
38 | the 4th element is the number of argument slots to allocate. | |
39 | This determines the size of the tree node object. */ | |
40 | ||
41 | /* Any erroneous construct is parsed into a node of this type. | |
42 | This type of node is accepted without complaint in all contexts | |
43 | by later parsing activities, to avoid multiple error messages | |
44 | for one error. | |
45 | No fields in these nodes are used except the TREE_CODE. */ | |
cba734ea | 46 | DEFTREECODE (ERROR_MARK, "error_mark", 'x', 0) |
6d77ee89 BK |
47 | |
48 | /* Used to represent a name (such as, in the DECL_NAME of a decl node). | |
49 | Internally it looks like a STRING_CST node. | |
50 | There is only one IDENTIFIER_NODE ever made for any particular name. | |
51 | Use `get_identifier' to get it (or create it, the first time). */ | |
2f9834e8 | 52 | DEFTREECODE (IDENTIFIER_NODE, "identifier_node", 'x', ((LANG_HOOKS_IDENTIFIER_SIZE - sizeof (struct tree_common) + sizeof (tree) - 1) / sizeof (tree))) |
6d77ee89 | 53 | |
6d77ee89 BK |
54 | /* Has the TREE_VALUE and TREE_PURPOSE fields. */ |
55 | /* These nodes are made into lists by chaining through the | |
56 | TREE_CHAIN field. The elements of the list live in the | |
57 | TREE_VALUE fields, while TREE_PURPOSE fields are occasionally | |
58 | used as well to get the effect of Lisp association lists. */ | |
cba734ea | 59 | DEFTREECODE (TREE_LIST, "tree_list", 'x', 2) |
6d77ee89 BK |
60 | |
61 | /* These nodes contain an array of tree nodes. */ | |
cba734ea | 62 | DEFTREECODE (TREE_VEC, "tree_vec", 'x', 2) |
6d77ee89 BK |
63 | |
64 | /* A symbol binding block. These are arranged in a tree, | |
65 | where the BLOCK_SUBBLOCKS field contains a chain of subblocks | |
66 | chained through the BLOCK_CHAIN field. | |
67 | BLOCK_SUPERCONTEXT points to the parent block. | |
68 | For a block which represents the outermost scope of a function, it | |
69 | points to the FUNCTION_DECL node. | |
70 | BLOCK_VARS points to a chain of decl nodes. | |
71 | BLOCK_TYPE_TAGS points to a chain of types which have their own names. | |
72 | BLOCK_CHAIN points to the next BLOCK at the same level. | |
73 | BLOCK_ABSTRACT_ORIGIN points to the original (abstract) tree node which | |
74 | this block is an instance of, or else is NULL to indicate that this | |
75 | block is not an instance of anything else. When non-NULL, the value | |
76 | could either point to another BLOCK node or it could point to a | |
77 | FUNCTION_DECL node (e.g. in the case of a block representing the | |
78 | outermost scope of a particular inlining of a function). | |
0e9e1e0a | 79 | BLOCK_ABSTRACT is nonzero if the block represents an abstract |
6d77ee89 | 80 | instance of a block (i.e. one which is nested within an abstract |
18c038b9 | 81 | instance of an inline function). |
0e9e1e0a | 82 | TREE_ASM_WRITTEN is nonzero if the block was actually referenced |
18c038b9 | 83 | in the generated assembly. */ |
cba734ea | 84 | DEFTREECODE (BLOCK, "block", 'b', 0) |
6d77ee89 BK |
85 | \f |
86 | /* Each data type is represented by a tree node whose code is one of | |
87 | the following: */ | |
88 | /* Each node that represents a data type has a component TYPE_SIZE | |
89 | containing a tree that is an expression for the size in bits. | |
90 | The TYPE_MODE contains the machine mode for values of this type. | |
91 | The TYPE_POINTER_TO field contains a type for a pointer to this type, | |
92 | or zero if no such has been created yet. | |
93 | The TYPE_NEXT_VARIANT field is used to chain together types | |
94 | that are variants made by type modifiers such as "const" and "volatile". | |
95 | The TYPE_MAIN_VARIANT field, in any member of such a chain, | |
96 | points to the start of the chain. | |
97 | The TYPE_NONCOPIED_PARTS field is a list specifying which parts | |
98 | of an object of this type should *not* be copied by assignment. | |
c15398de MM |
99 | The TREE_VALUE of each is a FIELD_DECL that should not be |
100 | copied. The TREE_PURPOSE is an initial value for that field when | |
101 | an object of this type is initialized via an INIT_EXPR. It may | |
102 | be NULL if no special value is required. Even the things in this | |
103 | list are copied if the right-hand side of an assignment is known | |
104 | to be a complete object (rather than being, perhaps, a subobject | |
105 | of some other object.) The determination of what constitutes a | |
106 | complete object is done by fixed_type_p. | |
6d77ee89 BK |
107 | The TYPE_NAME field contains info on the name used in the program |
108 | for this type (for GDB symbol table output). It is either a | |
109 | TYPE_DECL node, for types that are typedefs, or an IDENTIFIER_NODE | |
110 | in the case of structs, unions or enums that are known with a tag, | |
111 | or zero for types that have no special name. | |
112 | The TYPE_CONTEXT for any sort of type which could have a name or | |
113 | which could have named members (e.g. tagged types in C/C++) will | |
114 | point to the node which represents the scope of the given type, or | |
115 | will be NULL_TREE if the type has "file scope". For most types, this | |
116 | will point to a BLOCK node or a FUNCTION_DECL node, but it could also | |
117 | point to a FUNCTION_TYPE node (for types whose scope is limited to the | |
118 | formal parameter list of some function type specification) or it | |
08703ee4 RK |
119 | could point to a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE node |
120 | (for C++ "member" types). | |
6d77ee89 BK |
121 | For non-tagged-types, TYPE_CONTEXT need not be set to anything in |
122 | particular, since any type which is of some type category (e.g. | |
123 | an array type or a function type) which cannot either have a name | |
08703ee4 RK |
124 | itself or have named members doesn't really have a "scope" per se. |
125 | The TREE_CHAIN field is used as a forward-references to names for | |
126 | ENUMERAL_TYPE, RECORD_TYPE, UNION_TYPE, and QUAL_UNION_TYPE nodes; | |
127 | see below. */ | |
6d77ee89 | 128 | |
0a6969ad | 129 | DEFTREECODE (VOID_TYPE, "void_type", 't', 0) /* The void type in C */ |
6d77ee89 | 130 | |
442cb32d PB |
131 | /* Integer types in all languages, including char in C. |
132 | Also used for sub-ranges of other discrete types. | |
133 | Has components TYPE_MIN_VALUE, TYPE_MAX_VALUE (expressions, inclusive) | |
6d77ee89 BK |
134 | and TYPE_PRECISION (number of bits used by this type). |
135 | In the case of a subrange type in Pascal, the TREE_TYPE | |
442cb32d PB |
136 | of this will point at the supertype (another INTEGER_TYPE, |
137 | or an ENUMERAL_TYPE, CHAR_TYPE, or BOOLEAN_TYPE). | |
6d77ee89 | 138 | Otherwise, the TREE_TYPE is zero. */ |
0a6969ad | 139 | DEFTREECODE (INTEGER_TYPE, "integer_type", 't', 0) |
6d77ee89 BK |
140 | |
141 | /* C's float and double. Different floating types are distinguished | |
142 | by machine mode and by the TYPE_SIZE and the TYPE_PRECISION. */ | |
0a6969ad | 143 | DEFTREECODE (REAL_TYPE, "real_type", 't', 0) |
6d77ee89 BK |
144 | |
145 | /* Complex number types. The TREE_TYPE field is the data type | |
146 | of the real and imaginary parts. */ | |
0a6969ad | 147 | DEFTREECODE (COMPLEX_TYPE, "complex_type", 't', 0) |
6d77ee89 | 148 | |
0b4565c9 BS |
149 | /* Vector types. The TREE_TYPE field is the data type of the vector |
150 | elements. */ | |
151 | DEFTREECODE (VECTOR_TYPE, "vector_type", 't', 0) | |
152 | ||
6d77ee89 BK |
153 | /* C enums. The type node looks just like an INTEGER_TYPE node. |
154 | The symbols for the values of the enum type are defined by | |
155 | CONST_DECL nodes, but the type does not point to them; | |
e6702919 | 156 | however, the TYPE_VALUES is a list in which each element's TREE_PURPOSE |
6d77ee89 BK |
157 | is a name and the TREE_VALUE is the value (an INTEGER_CST node). */ |
158 | /* A forward reference `enum foo' when no enum named foo is defined yet | |
159 | has zero (a null pointer) in its TYPE_SIZE. The tag name is in | |
160 | the TYPE_NAME field. If the type is later defined, the normal | |
161 | fields are filled in. | |
08703ee4 RK |
162 | RECORD_TYPE, UNION_TYPE, and QUAL_UNION_TYPE forward refs are |
163 | treated similarly. */ | |
0a6969ad | 164 | DEFTREECODE (ENUMERAL_TYPE, "enumeral_type", 't', 0) |
6d77ee89 BK |
165 | |
166 | /* Pascal's boolean type (true or false are the only values); | |
167 | no special fields needed. */ | |
0a6969ad | 168 | DEFTREECODE (BOOLEAN_TYPE, "boolean_type", 't', 0) |
6d77ee89 BK |
169 | |
170 | /* CHAR in Pascal; not used in C. | |
171 | No special fields needed. */ | |
0a6969ad | 172 | DEFTREECODE (CHAR_TYPE, "char_type", 't', 0) |
6d77ee89 BK |
173 | |
174 | /* All pointer-to-x types have code POINTER_TYPE. | |
175 | The TREE_TYPE points to the node for the type pointed to. */ | |
0a6969ad | 176 | DEFTREECODE (POINTER_TYPE, "pointer_type", 't', 0) |
6d77ee89 BK |
177 | |
178 | /* An offset is a pointer relative to an object. | |
179 | The TREE_TYPE field is the type of the object at the offset. | |
180 | The TYPE_OFFSET_BASETYPE points to the node for the type of object | |
181 | that the offset is relative to. */ | |
0a6969ad | 182 | DEFTREECODE (OFFSET_TYPE, "offset_type", 't', 0) |
6d77ee89 BK |
183 | |
184 | /* A reference is like a pointer except that it is coerced | |
185 | automatically to the value it points to. Used in C++. */ | |
0a6969ad | 186 | DEFTREECODE (REFERENCE_TYPE, "reference_type", 't', 0) |
6d77ee89 BK |
187 | |
188 | /* METHOD_TYPE is the type of a function which takes an extra first | |
189 | argument for "self", which is not present in the declared argument list. | |
190 | The TREE_TYPE is the return type of the method. The TYPE_METHOD_BASETYPE | |
191 | is the type of "self". TYPE_ARG_TYPES is the real argument list, which | |
192 | includes the hidden argument for "self". */ | |
0a6969ad | 193 | DEFTREECODE (METHOD_TYPE, "method_type", 't', 0) |
6d77ee89 BK |
194 | |
195 | /* Used for Pascal; details not determined right now. */ | |
0a6969ad | 196 | DEFTREECODE (FILE_TYPE, "file_type", 't', 0) |
6d77ee89 BK |
197 | |
198 | /* Types of arrays. Special fields: | |
199 | TREE_TYPE Type of an array element. | |
200 | TYPE_DOMAIN Type to index by. | |
201 | Its range of values specifies the array length. | |
6d77ee89 | 202 | The field TYPE_POINTER_TO (TREE_TYPE (array_type)) is always nonzero |
70b78a26 PB |
203 | and holds the type to coerce a value of that array type to in C. |
204 | TYPE_STRING_FLAG indicates a string (in contrast to an array of chars) | |
991b6592 | 205 | in languages (such as Chill) that make a distinction. */ |
6d77ee89 | 206 | /* Array types in C or Pascal */ |
0a6969ad | 207 | DEFTREECODE (ARRAY_TYPE, "array_type", 't', 0) |
6d77ee89 BK |
208 | |
209 | /* Types of sets for Pascal. Special fields are the same as | |
38d42ddb PB |
210 | in an array type. The target type is always a boolean type. |
211 | Used for both bitstrings and powersets in Chill; | |
991b6592 | 212 | TYPE_STRING_FLAG indicates a bitstring. */ |
0a6969ad | 213 | DEFTREECODE (SET_TYPE, "set_type", 't', 0) |
6d77ee89 | 214 | |
6d77ee89 BK |
215 | /* Struct in C, or record in Pascal. */ |
216 | /* Special fields: | |
a082c85a JM |
217 | TYPE_FIELDS chain of FIELD_DECLs for the fields of the struct, |
218 | and VAR_DECLs, TYPE_DECLs and CONST_DECLs for record-scope variables, | |
219 | types and enumerators. | |
6d77ee89 BK |
220 | A few may need to be added for Pascal. */ |
221 | /* See the comment above, before ENUMERAL_TYPE, for how | |
222 | forward references to struct tags are handled in C. */ | |
0a6969ad | 223 | DEFTREECODE (RECORD_TYPE, "record_type", 't', 0) |
6d77ee89 BK |
224 | |
225 | /* Union in C. Like a struct, except that the offsets of the fields | |
226 | will all be zero. */ | |
227 | /* See the comment above, before ENUMERAL_TYPE, for how | |
228 | forward references to union tags are handled in C. */ | |
0a6969ad | 229 | DEFTREECODE (UNION_TYPE, "union_type", 't', 0) /* C union type */ |
6d77ee89 | 230 | |
08703ee4 RK |
231 | /* Similar to UNION_TYPE, except that the expressions in DECL_QUALIFIER |
232 | in each FIELD_DECL determine what the union contains. The first | |
233 | field whose DECL_QUALIFIER expression is true is deemed to occupy | |
234 | the union. */ | |
0a6969ad | 235 | DEFTREECODE (QUAL_UNION_TYPE, "qual_union_type", 't', 0) |
08703ee4 | 236 | |
6d77ee89 BK |
237 | /* Type of functions. Special fields: |
238 | TREE_TYPE type of value returned. | |
239 | TYPE_ARG_TYPES list of types of arguments expected. | |
240 | this list is made of TREE_LIST nodes. | |
241 | Types of "Procedures" in languages where they are different from functions | |
242 | have code FUNCTION_TYPE also, but then TREE_TYPE is zero or void type. */ | |
0a6969ad | 243 | DEFTREECODE (FUNCTION_TYPE, "function_type", 't', 0) |
6d77ee89 BK |
244 | |
245 | /* This is a language-specific kind of type. | |
246 | Its meaning is defined by the language front end. | |
247 | layout_type does not know how to lay this out, | |
248 | so the front-end must do so manually. */ | |
0a6969ad | 249 | DEFTREECODE (LANG_TYPE, "lang_type", 't', 0) |
6d77ee89 BK |
250 | \f |
251 | /* Expressions */ | |
252 | ||
253 | /* First, the constants. */ | |
254 | ||
255 | /* Contents are in TREE_INT_CST_LOW and TREE_INT_CST_HIGH fields, | |
256 | 32 bits each, giving us a 64 bit constant capability. | |
257 | Note: constants of type char in Pascal are INTEGER_CST, | |
258 | and so are pointer constants such as nil in Pascal or NULL in C. | |
259 | `(int *) 1' in C also results in an INTEGER_CST. */ | |
0a6969ad | 260 | DEFTREECODE (INTEGER_CST, "integer_cst", 'c', 2) |
6d77ee89 BK |
261 | |
262 | /* Contents are in TREE_REAL_CST field. Also there is TREE_CST_RTL. */ | |
0a6969ad | 263 | DEFTREECODE (REAL_CST, "real_cst", 'c', 3) |
6d77ee89 BK |
264 | |
265 | /* Contents are in TREE_REALPART and TREE_IMAGPART fields, | |
266 | whose contents are other constant nodes. | |
267 | Also there is TREE_CST_RTL. */ | |
0a6969ad | 268 | DEFTREECODE (COMPLEX_CST, "complex_cst", 'c', 3) |
6d77ee89 | 269 | |
69ef87e2 AH |
270 | /* Contents are in TREE_VECTOR_CST_ELTS field. */ |
271 | DEFTREECODE (VECTOR_CST, "vector_cst", 'c', 3) | |
272 | ||
6d77ee89 BK |
273 | /* Contents are TREE_STRING_LENGTH and TREE_STRING_POINTER fields. |
274 | Also there is TREE_CST_RTL. */ | |
0a6969ad | 275 | DEFTREECODE (STRING_CST, "string_cst", 'c', 3) |
6d77ee89 BK |
276 | |
277 | /* Declarations. All references to names are represented as ..._DECL nodes. | |
278 | The decls in one binding context are chained through the TREE_CHAIN field. | |
279 | Each DECL has a DECL_NAME field which contains an IDENTIFIER_NODE. | |
280 | (Some decls, most often labels, may have zero as the DECL_NAME). | |
281 | DECL_CONTEXT points to the node representing the context in which | |
282 | this declaration has its scope. For FIELD_DECLs, this is the | |
08703ee4 RK |
283 | RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE node that the field |
284 | is a member of. For VAR_DECL, PARM_DECL, FUNCTION_DECL, LABEL_DECL, | |
a082c85a JM |
285 | and CONST_DECL nodes, this points to either the FUNCTION_DECL for the |
286 | containing function, the RECORD_TYPE or UNION_TYPE for the containing | |
287 | type, or NULL_TREE if the given decl has "file scope". | |
6d77ee89 BK |
288 | DECL_ABSTRACT_ORIGIN, if non-NULL, points to the original (abstract) |
289 | ..._DECL node of which this decl is an (inlined or template expanded) | |
290 | instance. | |
291 | The TREE_TYPE field holds the data type of the object, when relevant. | |
292 | LABEL_DECLs have no data type. For TYPE_DECL, the TREE_TYPE field | |
293 | contents are the type whose name is being declared. | |
294 | The DECL_ALIGN, DECL_SIZE, | |
295 | and DECL_MODE fields exist in decl nodes just as in type nodes. | |
296 | They are unused in LABEL_DECL, TYPE_DECL and CONST_DECL nodes. | |
297 | ||
298 | DECL_OFFSET holds an integer number of bits offset for the location. | |
299 | DECL_VOFFSET holds an expression for a variable offset; it is | |
300 | to be multiplied by DECL_VOFFSET_UNIT (an integer). | |
301 | These fields are relevant only in FIELD_DECLs and PARM_DECLs. | |
302 | ||
303 | DECL_INITIAL holds the value to initialize a variable to, | |
304 | or the value of a constant. For a function, it holds the body | |
305 | (a node of type BLOCK representing the function's binding contour | |
306 | and whose body contains the function's statements.) For a LABEL_DECL | |
307 | in C, it is a flag, nonzero if the label's definition has been seen. | |
308 | ||
309 | PARM_DECLs use a special field: | |
310 | DECL_ARG_TYPE is the type in which the argument is actually | |
311 | passed, which may be different from its type within the function. | |
312 | ||
313 | FUNCTION_DECLs use four special fields: | |
314 | DECL_ARGUMENTS holds a chain of PARM_DECL nodes for the arguments. | |
315 | DECL_RESULT holds a RESULT_DECL node for the value of a function, | |
316 | or it is 0 for a function that returns no value. | |
317 | (C functions returning void have zero here.) | |
dce2e8c0 JW |
318 | The TREE_TYPE field is the type in which the result is actually |
319 | returned. This is usually the same as the return type of the | |
320 | FUNCTION_DECL, but it may be a wider integer type because of | |
321 | promotion. | |
6d77ee89 BK |
322 | DECL_FUNCTION_CODE is a code number that is nonzero for |
323 | built-in functions. Its value is an enum built_in_function | |
324 | that says which built-in function it is. | |
325 | ||
326 | DECL_SOURCE_FILE holds a filename string and DECL_SOURCE_LINE | |
327 | holds a line number. In some cases these can be the location of | |
328 | a reference, if no definition has been seen. | |
329 | ||
0e9e1e0a | 330 | DECL_ABSTRACT is nonzero if the decl represents an abstract instance |
6d77ee89 BK |
331 | of a decl (i.e. one which is nested within an abstract instance of a |
332 | inline function. */ | |
333 | ||
0a6969ad JC |
334 | DEFTREECODE (FUNCTION_DECL, "function_decl", 'd', 0) |
335 | DEFTREECODE (LABEL_DECL, "label_decl", 'd', 0) | |
336 | DEFTREECODE (CONST_DECL, "const_decl", 'd', 0) | |
337 | DEFTREECODE (TYPE_DECL, "type_decl", 'd', 0) | |
338 | DEFTREECODE (VAR_DECL, "var_decl", 'd', 0) | |
339 | DEFTREECODE (PARM_DECL, "parm_decl", 'd', 0) | |
340 | DEFTREECODE (RESULT_DECL, "result_decl", 'd', 0) | |
341 | DEFTREECODE (FIELD_DECL, "field_decl", 'd', 0) | |
2addbe1d JM |
342 | |
343 | /* A namespace declaration. Namespaces appear in DECL_CONTEXT of other | |
344 | _DECLs, providing a hierarchy of names. */ | |
345 | DEFTREECODE (NAMESPACE_DECL, "namespace_decl", 'd', 0) | |
6d77ee89 BK |
346 | \f |
347 | /* References to storage. */ | |
348 | ||
349 | /* Value is structure or union component. | |
350 | Operand 0 is the structure or union (an expression); | |
351 | operand 1 is the field (a node of type FIELD_DECL). */ | |
0a6969ad | 352 | DEFTREECODE (COMPONENT_REF, "component_ref", 'r', 2) |
6d77ee89 BK |
353 | |
354 | /* Reference to a group of bits within an object. Similar to COMPONENT_REF | |
355 | except the position is given explicitly rather than via a FIELD_DECL. | |
356 | Operand 0 is the structure or union expression; | |
357 | operand 1 is a tree giving the number of bits being referenced; | |
358 | operand 2 is a tree giving the position of the first referenced bit. | |
359 | The field can be either a signed or unsigned field; | |
360 | TREE_UNSIGNED says which. */ | |
0a6969ad | 361 | DEFTREECODE (BIT_FIELD_REF, "bit_field_ref", 'r', 3) |
6d77ee89 BK |
362 | |
363 | /* C unary `*' or Pascal `^'. One operand, an expression for a pointer. */ | |
0a6969ad | 364 | DEFTREECODE (INDIRECT_REF, "indirect_ref", 'r', 1) |
6d77ee89 | 365 | |
6d77ee89 | 366 | /* Pascal `^` on a file. One operand, an expression for the file. */ |
0a6969ad | 367 | DEFTREECODE (BUFFER_REF, "buffer_ref", 'r', 1) |
6d77ee89 | 368 | |
b4e3fabb | 369 | /* Array indexing. |
991b6592 | 370 | Operand 0 is the array; operand 1 is a (single) array index. */ |
0a6969ad | 371 | DEFTREECODE (ARRAY_REF, "array_ref", 'r', 2) |
6d77ee89 | 372 | |
75c2550a RK |
373 | /* Likewise, except that the result is a range ("slice") of the array. The |
374 | starting index of the resulting array is taken from operand 1 and the size | |
375 | of the range is taken from the type of the expression. */ | |
b4e3fabb RK |
376 | DEFTREECODE (ARRAY_RANGE_REF, "array_range_ref", 'r', 2) |
377 | ||
4a8d0c9c RH |
378 | /* Vtable indexing. Carries data useful for emitting information |
379 | for vtable garbage collection. | |
380 | Operand 0: an array_ref (or equivalent expression) | |
381 | Operand 1: the vtable base (must be a var_decl) | |
382 | Operand 2: index into vtable (must be an integer_cst). */ | |
383 | DEFTREECODE (VTABLE_REF, "vtable_ref", 'r', 3) | |
384 | ||
6d77ee89 BK |
385 | /* Constructor: return an aggregate value made from specified components. |
386 | In C, this is used only for structure and array initializers. | |
69b4bf98 | 387 | Also used for SET_TYPE in Chill (and potentially Pascal). |
6d77ee89 BK |
388 | The first "operand" is really a pointer to the RTL, |
389 | for constant constructors only. | |
390 | The second operand is a list of component values | |
69b4bf98 PB |
391 | made out of a chain of TREE_LIST nodes. |
392 | ||
393 | For ARRAY_TYPE: | |
394 | The TREE_PURPOSE of each node is the corresponding index. | |
395 | If the TREE_PURPOSE is a RANGE_EXPR, it is a short-hand for many nodes, | |
396 | one for each index in the range. (If the corresponding TREE_VALUE | |
397 | has side-effects, they are evaluated once for each element. Wrap the | |
398 | value in a SAVE_EXPR if you want to evaluate side effects only once.) | |
399 | ||
400 | For RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE: | |
401 | The TREE_PURPOSE of each node is a FIELD_DECL. | |
402 | ||
403 | For SET_TYPE: | |
404 | The TREE_VALUE specifies a value (index) in the set that is true. | |
405 | If TREE_PURPOSE is non-NULL, it specifies the lower limit of a | |
406 | range of true values. Elements not listed are false (not in the set). */ | |
0a6969ad | 407 | DEFTREECODE (CONSTRUCTOR, "constructor", 'e', 2) |
6d77ee89 | 408 | |
340af9ef RK |
409 | /* The expression types are mostly straightforward, with the fourth argument |
410 | of DEFTREECODE saying how many operands there are. | |
411 | Unless otherwise specified, the operands are expressions and the | |
412 | types of all the operands and the expression must all be the same. */ | |
6d77ee89 BK |
413 | |
414 | /* Contains two expressions to compute, one followed by the other. | |
340af9ef RK |
415 | the first value is ignored. The second one's value is used. The |
416 | type of the first expression need not agree with the other types. */ | |
0a6969ad | 417 | DEFTREECODE (COMPOUND_EXPR, "compound_expr", 'e', 2) |
6d77ee89 BK |
418 | |
419 | /* Assignment expression. Operand 0 is the what to set; 1, the new value. */ | |
0a6969ad | 420 | DEFTREECODE (MODIFY_EXPR, "modify_expr", 'e', 2) |
6d77ee89 BK |
421 | |
422 | /* Initialization expression. Operand 0 is the variable to initialize; | |
423 | Operand 1 is the initializer. */ | |
0a6969ad | 424 | DEFTREECODE (INIT_EXPR, "init_expr", 'e', 2) |
6d77ee89 BK |
425 | |
426 | /* For TARGET_EXPR, operand 0 is the target of an initialization, | |
427 | operand 1 is the initializer for the target, | |
4847c938 MS |
428 | and operand 2 is the cleanup for this node, if any. |
429 | and operand 3 is the saved initializer after this node has been | |
430 | expanded once, this is so we can re-expand the tree later. */ | |
0a6969ad | 431 | DEFTREECODE (TARGET_EXPR, "target_expr", 'e', 4) |
6d77ee89 BK |
432 | |
433 | /* Conditional expression ( ... ? ... : ... in C). | |
434 | Operand 0 is the condition. | |
435 | Operand 1 is the then-value. | |
340af9ef | 436 | Operand 2 is the else-value. |
68626d4f MM |
437 | Operand 0 may be of any type. |
438 | Operand 1 must have the same type as the entire expression, unless | |
439 | it unconditionally throws an exception, in which case it should | |
440 | have VOID_TYPE. The same constraints apply to operand 2. */ | |
0a6969ad | 441 | DEFTREECODE (COND_EXPR, "cond_expr", 'e', 3) |
6d77ee89 BK |
442 | |
443 | /* Declare local variables, including making RTL and allocating space. | |
444 | Operand 0 is a chain of VAR_DECL nodes for the variables. | |
445 | Operand 1 is the body, the expression to be computed using | |
446 | the variables. The value of operand 1 becomes that of the BIND_EXPR. | |
447 | Operand 2 is the BLOCK that corresponds to these bindings | |
448 | for debugging purposes. If this BIND_EXPR is actually expanded, | |
449 | that sets the TREE_USED flag in the BLOCK. | |
450 | ||
451 | The BIND_EXPR is not responsible for informing parsers | |
452 | about these variables. If the body is coming from the input file, | |
453 | then the code that creates the BIND_EXPR is also responsible for | |
454 | informing the parser of the variables. | |
455 | ||
456 | If the BIND_EXPR is ever expanded, its TREE_USED flag is set. | |
457 | This tells the code for debugging symbol tables not to ignore the BIND_EXPR. | |
458 | If the BIND_EXPR should be output for debugging but will not be expanded, | |
459 | set the TREE_USED flag by hand. | |
460 | ||
461 | In order for the BIND_EXPR to be known at all, the code that creates it | |
462 | must also install it as a subblock in the tree of BLOCK | |
463 | nodes for the function. */ | |
0a6969ad | 464 | DEFTREECODE (BIND_EXPR, "bind_expr", 'e', 3) |
6d77ee89 BK |
465 | |
466 | /* Function call. Operand 0 is the function. | |
467 | Operand 1 is the argument list, a list of expressions | |
f9808f81 MM |
468 | made out of a chain of TREE_LIST nodes. */ |
469 | DEFTREECODE (CALL_EXPR, "call_expr", 'e', 2) | |
6d77ee89 BK |
470 | |
471 | /* Call a method. Operand 0 is the method, whose type is a METHOD_TYPE. | |
472 | Operand 1 is the expression for "self". | |
473 | Operand 2 is the list of explicit arguments. */ | |
0a6969ad | 474 | DEFTREECODE (METHOD_CALL_EXPR, "method_call_expr", 'e', 4) |
6d77ee89 BK |
475 | |
476 | /* Specify a value to compute along with its corresponding cleanup. | |
477 | Operand 0 argument is an expression whose value needs a cleanup. | |
6ad7895a APB |
478 | Operand 1 is the cleanup expression for the object. |
479 | Operand 2 is an RTL_EXPR which will eventually represent that value. | |
6d77ee89 BK |
480 | The RTL_EXPR is used in this expression, which is how the expression |
481 | manages to act on the proper value. | |
5dab5552 MS |
482 | The cleanup is executed by the first enclosing CLEANUP_POINT_EXPR, if |
483 | it exists, otherwise it is the responsibility of the caller to manually | |
e976b8b2 MS |
484 | call expand_start_target_temps/expand_end_target_temps, as needed. |
485 | ||
486 | This differs from TRY_CATCH_EXPR in that operand 2 is always | |
d32ecec2 | 487 | evaluated when an exception isn't thrown when cleanups are run. */ |
0a6969ad | 488 | DEFTREECODE (WITH_CLEANUP_EXPR, "with_cleanup_expr", 'e', 3) |
5dab5552 MS |
489 | |
490 | /* Specify a cleanup point. | |
8736e836 JM |
491 | Operand 0 is an expression that may have cleanups. If it does, those |
492 | cleanups are executed after the expression is expanded. | |
493 | ||
494 | Note that if the expression is a reference to storage, it is forced out | |
495 | of memory before the cleanups are run. This is necessary to handle | |
496 | cases where the cleanups modify the storage referenced; in the | |
497 | expression 't.i', if 't' is a struct with an integer member 'i' and a | |
498 | cleanup which modifies 'i', the value of the expression depends on | |
499 | whether the cleanup is run before or after 't.i' is evaluated. When | |
500 | expand_expr is run on 't.i', it returns a MEM. This is not good enough; | |
501 | the value of 't.i' must be forced out of memory. | |
502 | ||
503 | As a consequence, the operand of a CLEANUP_POINT_EXPR must not have | |
504 | BLKmode, because it will not be forced out of memory. */ | |
0a6969ad | 505 | DEFTREECODE (CLEANUP_POINT_EXPR, "cleanup_point_expr", 'e', 1) |
6d77ee89 | 506 | |
ab487f12 | 507 | /* The following two codes are used in languages that have types where |
2a7b6292 PG |
508 | some field in an object of the type contains a value that is used in |
509 | the computation of another field's offset or size and/or the size of | |
510 | the type. The positions and/or sizes of fields can vary from object | |
511 | to object of the same type. | |
512 | ||
513 | Record types with discriminants in Ada or schema types in Pascal are | |
514 | examples of such types. This mechanism is also used to create "fat | |
515 | pointers" for unconstrained array types in Ada; the fat pointer is a | |
516 | structure one of whose fields is a pointer to the actual array type | |
517 | and the other field is a pointer to a template, which is a structure | |
518 | containing the bounds of the array. The bounds in the type pointed | |
519 | to by the first field in the fat pointer refer to the values in the | |
520 | template. | |
521 | ||
522 | When you wish to construct such a type you need "self-references" | |
523 | that allow you to reference the object having this type from the | |
524 | TYPE node, i.e. without having a variable instantiating this type. | |
525 | ||
526 | Such a "self-references" is done using a PLACEHOLDER_EXPR. This is | |
527 | a node that will later be replaced with the object being referenced. | |
528 | Its type is that of the object and selects which object to use from | |
529 | a chain of references (see below). No other slots are used in the | |
530 | PLACEHOLDER_EXPR. | |
531 | ||
532 | For example, if your type FOO is a RECORD_TYPE with a field BAR, | |
533 | and you need the value of <variable>.BAR to calculate TYPE_SIZE | |
534 | (FOO), just substitute <variable> above with a PLACEHOLDER_EXPR | |
535 | what contains both the expression we wish to | |
536 | evaluate and an expression within which the object may be found. | |
537 | The latter expression is the object itself in the simple case of an | |
538 | Ada record with discriminant, but it can be the array in the case of | |
539 | an unconstrained array. | |
540 | ||
541 | In the latter case, we need the fat pointer, because the bounds of | |
542 | the array can only be accessed from it. However, we rely here on the | |
543 | fact that the expression for the array contains the dereference of | |
544 | the fat pointer that obtained the array pointer. | |
ab487f12 RK |
545 | |
546 | Accordingly, when looking for the object to substitute in place of | |
547 | a PLACEHOLDER_EXPR, we look down the first operand of the expression | |
2a7b6292 PG |
548 | passed as the second operand to WITH_RECORD_EXPR until we find |
549 | something of the desired type or reach a constant. */ | |
ab487f12 RK |
550 | |
551 | /* Denotes a record to later be supplied with a WITH_RECORD_EXPR when | |
552 | evaluating this expression. The type of this expression is used to | |
553 | find the record to replace it. */ | |
0a6969ad | 554 | DEFTREECODE (PLACEHOLDER_EXPR, "placeholder_expr", 'x', 0) |
ab487f12 RK |
555 | |
556 | /* Provide an expression that references a record to be used in place | |
557 | of a PLACEHOLDER_EXPR. The record to be used is the record within | |
558 | operand 1 that has the same type as the PLACEHOLDER_EXPR in | |
559 | operand 0. */ | |
0a6969ad | 560 | DEFTREECODE (WITH_RECORD_EXPR, "with_record_expr", 'e', 2) |
ab487f12 | 561 | |
340af9ef | 562 | /* Simple arithmetic. */ |
0a6969ad JC |
563 | DEFTREECODE (PLUS_EXPR, "plus_expr", '2', 2) |
564 | DEFTREECODE (MINUS_EXPR, "minus_expr", '2', 2) | |
565 | DEFTREECODE (MULT_EXPR, "mult_expr", '2', 2) | |
6d77ee89 BK |
566 | |
567 | /* Division for integer result that rounds the quotient toward zero. */ | |
0a6969ad | 568 | DEFTREECODE (TRUNC_DIV_EXPR, "trunc_div_expr", '2', 2) |
6d77ee89 BK |
569 | |
570 | /* Division for integer result that rounds the quotient toward infinity. */ | |
0a6969ad | 571 | DEFTREECODE (CEIL_DIV_EXPR, "ceil_div_expr", '2', 2) |
6d77ee89 BK |
572 | |
573 | /* Division for integer result that rounds toward minus infinity. */ | |
0a6969ad | 574 | DEFTREECODE (FLOOR_DIV_EXPR, "floor_div_expr", '2', 2) |
6d77ee89 BK |
575 | |
576 | /* Division for integer result that rounds toward nearest integer. */ | |
0a6969ad | 577 | DEFTREECODE (ROUND_DIV_EXPR, "round_div_expr", '2', 2) |
6d77ee89 BK |
578 | |
579 | /* Four kinds of remainder that go with the four kinds of division. */ | |
0a6969ad JC |
580 | DEFTREECODE (TRUNC_MOD_EXPR, "trunc_mod_expr", '2', 2) |
581 | DEFTREECODE (CEIL_MOD_EXPR, "ceil_mod_expr", '2', 2) | |
582 | DEFTREECODE (FLOOR_MOD_EXPR, "floor_mod_expr", '2', 2) | |
583 | DEFTREECODE (ROUND_MOD_EXPR, "round_mod_expr", '2', 2) | |
6d77ee89 | 584 | |
340af9ef | 585 | /* Division for real result. */ |
0a6969ad | 586 | DEFTREECODE (RDIV_EXPR, "rdiv_expr", '2', 2) |
6d77ee89 BK |
587 | |
588 | /* Division which is not supposed to need rounding. | |
589 | Used for pointer subtraction in C. */ | |
0a6969ad | 590 | DEFTREECODE (EXACT_DIV_EXPR, "exact_div_expr", '2', 2) |
6d77ee89 BK |
591 | |
592 | /* Conversion of real to fixed point: four ways to round, | |
593 | like the four ways to divide. | |
594 | CONVERT_EXPR can also be used to convert a real to an integer, | |
595 | and that is what is used in languages that do not have ways of | |
596 | specifying which of these is wanted. Maybe these are not needed. */ | |
0a6969ad JC |
597 | DEFTREECODE (FIX_TRUNC_EXPR, "fix_trunc_expr", '1', 1) |
598 | DEFTREECODE (FIX_CEIL_EXPR, "fix_ceil_expr", '1', 1) | |
599 | DEFTREECODE (FIX_FLOOR_EXPR, "fix_floor_expr", '1', 1) | |
600 | DEFTREECODE (FIX_ROUND_EXPR, "fix_round_expr", '1', 1) | |
6d77ee89 BK |
601 | |
602 | /* Conversion of an integer to a real. */ | |
0a6969ad | 603 | DEFTREECODE (FLOAT_EXPR, "float_expr", '1', 1) |
6d77ee89 | 604 | |
340af9ef | 605 | /* Unary negation. */ |
0a6969ad | 606 | DEFTREECODE (NEGATE_EXPR, "negate_expr", '1', 1) |
6d77ee89 | 607 | |
0a6969ad JC |
608 | DEFTREECODE (MIN_EXPR, "min_expr", '2', 2) |
609 | DEFTREECODE (MAX_EXPR, "max_expr", '2', 2) | |
68e568c2 MM |
610 | |
611 | /* Represents the absolute value of the operand. | |
612 | ||
613 | An ABS_EXPR must have either an INTEGER_TYPE or a REAL_TYPE. The | |
614 | operand of the ABS_EXPR must have the same type. */ | |
0a6969ad | 615 | DEFTREECODE (ABS_EXPR, "abs_expr", '1', 1) |
68e568c2 | 616 | |
2928cd7a | 617 | /* Bit scanning and counting. */ |
0a6969ad | 618 | DEFTREECODE (FFS_EXPR, "ffs_expr", '1', 1) |
2928cd7a RH |
619 | DEFTREECODE (CLZ_EXPR, "clz_expr", '1', 1) |
620 | DEFTREECODE (CTZ_EXPR, "ctz_expr", '1', 1) | |
621 | DEFTREECODE (POPCOUNT_EXPR, "popcount_expr", '1', 1) | |
622 | DEFTREECODE (PARITY_EXPR, "parity_expr", '1', 1) | |
6d77ee89 BK |
623 | |
624 | /* Shift operations for shift and rotate. | |
4b7ee615 NS |
625 | Shift means logical shift if done on an |
626 | unsigned type, arithmetic shift if done on a signed type. | |
6d77ee89 | 627 | The second operand is the number of bits to |
7d46d516 TM |
628 | shift by; it need not be the same type as the first operand and result. |
629 | Note that the result is undefined if the second operand is larger | |
630 | than the first operand's type size. */ | |
0a6969ad JC |
631 | DEFTREECODE (LSHIFT_EXPR, "lshift_expr", '2', 2) |
632 | DEFTREECODE (RSHIFT_EXPR, "rshift_expr", '2', 2) | |
633 | DEFTREECODE (LROTATE_EXPR, "lrotate_expr", '2', 2) | |
634 | DEFTREECODE (RROTATE_EXPR, "rrotate_expr", '2', 2) | |
6d77ee89 BK |
635 | |
636 | /* Bitwise operations. Operands have same mode as result. */ | |
0a6969ad JC |
637 | DEFTREECODE (BIT_IOR_EXPR, "bit_ior_expr", '2', 2) |
638 | DEFTREECODE (BIT_XOR_EXPR, "bit_xor_expr", '2', 2) | |
639 | DEFTREECODE (BIT_AND_EXPR, "bit_and_expr", '2', 2) | |
640 | DEFTREECODE (BIT_ANDTC_EXPR, "bit_andtc_expr", '2', 2) | |
641 | DEFTREECODE (BIT_NOT_EXPR, "bit_not_expr", '1', 1) | |
6d77ee89 | 642 | |
330aa9a3 MM |
643 | /* ANDIF and ORIF allow the second operand not to be computed if the |
644 | value of the expression is determined from the first operand. AND, | |
645 | OR, and XOR always compute the second operand whether its value is | |
646 | needed or not (for side effects). The operand may have | |
647 | BOOLEAN_TYPE or INTEGER_TYPE. In either case, the argument will be | |
648 | either zero or one. For example, a TRUTH_NOT_EXPR will never have | |
04d2be8e | 649 | an INTEGER_TYPE VAR_DECL as its argument; instead, a NE_EXPR will be |
330aa9a3 MM |
650 | used to compare the VAR_DECL to zero, thereby obtaining a node with |
651 | value zero or one. */ | |
0a6969ad JC |
652 | DEFTREECODE (TRUTH_ANDIF_EXPR, "truth_andif_expr", 'e', 2) |
653 | DEFTREECODE (TRUTH_ORIF_EXPR, "truth_orif_expr", 'e', 2) | |
654 | DEFTREECODE (TRUTH_AND_EXPR, "truth_and_expr", 'e', 2) | |
655 | DEFTREECODE (TRUTH_OR_EXPR, "truth_or_expr", 'e', 2) | |
656 | DEFTREECODE (TRUTH_XOR_EXPR, "truth_xor_expr", 'e', 2) | |
657 | DEFTREECODE (TRUTH_NOT_EXPR, "truth_not_expr", 'e', 1) | |
6d77ee89 BK |
658 | |
659 | /* Relational operators. | |
660 | `EQ_EXPR' and `NE_EXPR' are allowed for any types. | |
661 | The others are allowed only for integer (or pointer or enumeral) | |
662 | or real types. | |
663 | In all cases the operands will have the same type, | |
664 | and the value is always the type used by the language for booleans. */ | |
0a6969ad JC |
665 | DEFTREECODE (LT_EXPR, "lt_expr", '<', 2) |
666 | DEFTREECODE (LE_EXPR, "le_expr", '<', 2) | |
667 | DEFTREECODE (GT_EXPR, "gt_expr", '<', 2) | |
668 | DEFTREECODE (GE_EXPR, "ge_expr", '<', 2) | |
669 | DEFTREECODE (EQ_EXPR, "eq_expr", '<', 2) | |
670 | DEFTREECODE (NE_EXPR, "ne_expr", '<', 2) | |
6d77ee89 | 671 | |
1eb8759b RH |
672 | /* Additional relational operators for floating point unordered. */ |
673 | DEFTREECODE (UNORDERED_EXPR, "unordered_expr", '<', 2) | |
674 | DEFTREECODE (ORDERED_EXPR, "ordered_expr", '<', 2) | |
675 | ||
991b6592 | 676 | /* These are equivalent to unordered or ... */ |
1eb8759b RH |
677 | DEFTREECODE (UNLT_EXPR, "unlt_expr", '<', 2) |
678 | DEFTREECODE (UNLE_EXPR, "unle_expr", '<', 2) | |
679 | DEFTREECODE (UNGT_EXPR, "ungt_expr", '<', 2) | |
680 | DEFTREECODE (UNGE_EXPR, "unge_expr", '<', 2) | |
681 | DEFTREECODE (UNEQ_EXPR, "uneq_expr", '<', 2) | |
1eb8759b | 682 | |
6d77ee89 | 683 | /* Operations for Pascal sets. Not used now. */ |
0a6969ad JC |
684 | DEFTREECODE (IN_EXPR, "in_expr", '2', 2) |
685 | DEFTREECODE (SET_LE_EXPR, "set_le_expr", '<', 2) | |
686 | DEFTREECODE (CARD_EXPR, "card_expr", '1', 1) | |
687 | DEFTREECODE (RANGE_EXPR, "range_expr", '2', 2) | |
6d77ee89 BK |
688 | |
689 | /* Represents a conversion of type of a value. | |
690 | All conversions, including implicit ones, must be | |
340af9ef | 691 | represented by CONVERT_EXPR or NOP_EXPR nodes. */ |
0a6969ad | 692 | DEFTREECODE (CONVERT_EXPR, "convert_expr", '1', 1) |
6d77ee89 BK |
693 | |
694 | /* Represents a conversion expected to require no code to be generated. */ | |
0a6969ad | 695 | DEFTREECODE (NOP_EXPR, "nop_expr", '1', 1) |
6d77ee89 BK |
696 | |
697 | /* Value is same as argument, but guaranteed not an lvalue. */ | |
0a6969ad | 698 | DEFTREECODE (NON_LVALUE_EXPR, "non_lvalue_expr", '1', 1) |
6d77ee89 | 699 | |
ed239f5a RK |
700 | /* Represents viewing something of one type as being of a second type. |
701 | This corresponds to an "Unchecked Conversion" in Ada and roughly to | |
702 | the idiom *(type2 *)&X in C. The only operand is the value to be | |
703 | viewed as being of another type. It is undefined if the type of the | |
c11c10d8 RK |
704 | input and of the expression have different sizes. |
705 | ||
706 | This code may also be used within the LHS of a MODIFY_EXPR, in which | |
707 | case no actual data motion may occur. TREE_ADDRESSABLE will be set in | |
708 | this case and GCC must abort if it could not do the operation without | |
709 | generating insns. */ | |
ed239f5a RK |
710 | DEFTREECODE (VIEW_CONVERT_EXPR, "view_convert_expr", '1', 1) |
711 | ||
6d77ee89 BK |
712 | /* Represents something we computed once and will use multiple times. |
713 | First operand is that expression. Second is the function decl | |
714 | in which the SAVE_EXPR was created. The third operand is the RTL, | |
715 | nonzero only after the expression has been computed. */ | |
0a6969ad | 716 | DEFTREECODE (SAVE_EXPR, "save_expr", 'e', 3) |
6d77ee89 | 717 | |
679163cf MS |
718 | /* For a UNSAVE_EXPR, operand 0 is the value to unsave. By unsave, we |
719 | mean that all _EXPRs such as TARGET_EXPRs, SAVE_EXPRs, | |
720 | CALL_EXPRs and RTL_EXPRs, that are protected | |
721 | from being evaluated more than once should be reset so that a new | |
722 | expand_expr call of this expr will cause those to be re-evaluated. | |
723 | This is useful when we want to reuse a tree in different places, | |
724 | but where we must re-expand. */ | |
0a6969ad | 725 | DEFTREECODE (UNSAVE_EXPR, "unsave_expr", 'e', 1) |
679163cf | 726 | |
9f937026 MM |
727 | /* Represents something whose RTL has already been expanded as a |
728 | sequence which should be emitted when this expression is expanded. | |
729 | The first operand is the RTL to emit. It is the first of a chain | |
64dc53f3 MM |
730 | of insns. The second is the RTL expression for the result. Any |
731 | temporaries created during the building of the RTL_EXPR can be | |
732 | reused once the RTL_EXPR has been expanded, with the exception of | |
733 | the RTL_EXPR_RTL. */ | |
0a6969ad | 734 | DEFTREECODE (RTL_EXPR, "rtl_expr", 'e', 2) |
6d77ee89 BK |
735 | |
736 | /* & in C. Value is the address at which the operand's value resides. | |
737 | Operand may have any mode. Result mode is Pmode. */ | |
0a6969ad | 738 | DEFTREECODE (ADDR_EXPR, "addr_expr", 'e', 1) |
6d77ee89 BK |
739 | |
740 | /* Non-lvalue reference or pointer to an object. */ | |
0a6969ad | 741 | DEFTREECODE (REFERENCE_EXPR, "reference_expr", 'e', 1) |
6d77ee89 BK |
742 | |
743 | /* Operand is a function constant; result is a function variable value | |
67231816 | 744 | of type EPmode. Used only for languages that need static chains. */ |
0a6969ad | 745 | DEFTREECODE (ENTRY_VALUE_EXPR, "entry_value_expr", 'e', 1) |
6d77ee89 | 746 | |
67231816 RH |
747 | /* Operand0 is a function constant; result is part N of a function |
748 | descriptor of type ptr_mode. */ | |
749 | DEFTREECODE (FDESC_EXPR, "fdesc_expr", 'e', 2) | |
750 | ||
6d77ee89 BK |
751 | /* Given two real or integer operands of the same type, |
752 | returns a complex value of the corresponding complex type. */ | |
0a6969ad | 753 | DEFTREECODE (COMPLEX_EXPR, "complex_expr", '2', 2) |
6d77ee89 | 754 | |
340af9ef | 755 | /* Complex conjugate of operand. Used only on complex types. */ |
0a6969ad | 756 | DEFTREECODE (CONJ_EXPR, "conj_expr", '1', 1) |
6d77ee89 BK |
757 | |
758 | /* Used only on an operand of complex type, these return | |
759 | a value of the corresponding component type. */ | |
0a6969ad JC |
760 | DEFTREECODE (REALPART_EXPR, "realpart_expr", '1', 1) |
761 | DEFTREECODE (IMAGPART_EXPR, "imagpart_expr", '1', 1) | |
6d77ee89 BK |
762 | |
763 | /* Nodes for ++ and -- in C. | |
764 | The second arg is how much to increment or decrement by. | |
765 | For a pointer, it would be the size of the object pointed to. */ | |
0a6969ad JC |
766 | DEFTREECODE (PREDECREMENT_EXPR, "predecrement_expr", 'e', 2) |
767 | DEFTREECODE (PREINCREMENT_EXPR, "preincrement_expr", 'e', 2) | |
768 | DEFTREECODE (POSTDECREMENT_EXPR, "postdecrement_expr", 'e', 2) | |
769 | DEFTREECODE (POSTINCREMENT_EXPR, "postincrement_expr", 'e', 2) | |
e976b8b2 | 770 | |
d3707adb RH |
771 | /* Used to implement `va_arg'. */ |
772 | DEFTREECODE (VA_ARG_EXPR, "va_arg_expr", 'e', 1) | |
773 | ||
956d6950 | 774 | /* Evaluate operand 1. If and only if an exception is thrown during |
e976b8b2 MS |
775 | the evaluation of operand 1, evaluate operand 2. |
776 | ||
777 | This differs from WITH_CLEANUP_EXPR, in that operand 2 is never | |
778 | evaluated unless an exception is throw. */ | |
0a6969ad | 779 | DEFTREECODE (TRY_CATCH_EXPR, "try_catch_expr", 'e', 2) |
e976b8b2 | 780 | |
502bf1f3 | 781 | /* Evaluate the first operand. |
04d2be8e | 782 | The second operand is a cleanup expression which is evaluated |
502bf1f3 PB |
783 | before an exit (normal, exception, or jump out) from this expression. |
784 | ||
785 | Like a CLEANUP_POINT_EXPR/WITH_CLEANUP_EXPR combination, but those | |
786 | always copy the cleanup expression where needed. In contrast, | |
787 | TRY_FINALLY_EXPR generates a jump to a cleanup subroutine. | |
788 | (At least conceptually; the optimizer could inline the cleanup | |
789 | subroutine in the same way it could inline normal subroutines.) | |
790 | TRY_FINALLY_EXPR should be used when the cleanup is actual statements | |
791 | in the source of the current function (which people might want to | |
792 | set breakpoints in). */ | |
793 | DEFTREECODE (TRY_FINALLY_EXPR, "try_finally", 'e', 2) | |
794 | ||
795 | /* Used internally for cleanups in the implementation of TRY_FINALLY_EXPR. | |
796 | (Specifically, it is created by expand_expr, not front-ends.) | |
797 | Operand 0 is the rtx for the start of the subroutine we need to call. | |
798 | Operand 1 is the rtx for a variable in which to store the address | |
799 | of where the subroutine should return to. */ | |
800 | DEFTREECODE (GOTO_SUBROUTINE_EXPR, "goto_subroutine", 'e', 2) | |
6d77ee89 BK |
801 | \f |
802 | /* These types of expressions have no useful value, | |
803 | and always have side effects. */ | |
804 | ||
805 | /* A label definition, encapsulated as a statement. | |
806 | Operand 0 is the LABEL_DECL node for the label that appears here. | |
807 | The type should be void and the value should be ignored. */ | |
0a6969ad | 808 | DEFTREECODE (LABEL_EXPR, "label_expr", 's', 1) |
6d77ee89 | 809 | |
70e6ca43 | 810 | /* GOTO. Operand 0 is a LABEL_DECL node or an expression. |
6d77ee89 | 811 | The type should be void and the value should be ignored. */ |
0a6969ad | 812 | DEFTREECODE (GOTO_EXPR, "goto_expr", 's', 1) |
6d77ee89 BK |
813 | |
814 | /* RETURN. Evaluates operand 0, then returns from the current function. | |
815 | Presumably that operand is an assignment that stores into the | |
816 | RESULT_DECL that hold the value to be returned. | |
817 | The operand may be null. | |
818 | The type should be void and the value should be ignored. */ | |
0a6969ad | 819 | DEFTREECODE (RETURN_EXPR, "return_expr", 's', 1) |
6d77ee89 BK |
820 | |
821 | /* Exit the inner most loop conditionally. Operand 0 is the condition. | |
822 | The type should be void and the value should be ignored. */ | |
0a6969ad | 823 | DEFTREECODE (EXIT_EXPR, "exit_expr", 's', 1) |
6d77ee89 BK |
824 | |
825 | /* A loop. Operand 0 is the body of the loop. | |
826 | It must contain an EXIT_EXPR or is an infinite loop. | |
827 | The type should be void and the value should be ignored. */ | |
0a6969ad | 828 | DEFTREECODE (LOOP_EXPR, "loop_expr", 's', 1) |
6d77ee89 | 829 | |
0044c65c APB |
830 | /* A labeled block. Operand 0 is the label that will be generated to |
831 | mark the end of the block. | |
832 | Operand 1 is the labeled block body. */ | |
833 | DEFTREECODE (LABELED_BLOCK_EXPR, "labeled_block_expr", 'e', 2) | |
834 | ||
835 | /* Exit a labeled block, possibly returning a value. Operand 0 is a | |
836 | LABELED_BLOCK_EXPR to exit. Operand 1 is the value to return. It | |
837 | may be left null. */ | |
838 | DEFTREECODE (EXIT_BLOCK_EXPR, "exit_block_expr", 'e', 2) | |
839 | ||
2491f72d APB |
840 | /* Annotates a tree node (usually an expression) with source location |
841 | information: a file name (EXPR_WFL_FILENAME); a line number | |
842 | (EXPR_WFL_LINENO); and column number (EXPR_WFL_COLNO). It is | |
843 | expanded as the contained node (EXPR_WFL_NODE); a line note should | |
be821c5e APB |
844 | be emitted first if EXPR_WFL_EMIT_LINE_NOTE. |
845 | The third operand is only used in the Java front-end, and will | |
846 | eventually be removed. */ | |
847 | DEFTREECODE (EXPR_WITH_FILE_LOCATION, "expr_with_file_location", 'e', 3) | |
7c226435 APB |
848 | |
849 | /* Switch expression. | |
850 | Operand 0 is the expression used to perform the branch, | |
851 | Operand 1 contains the case values. The way they're organized is | |
991b6592 | 852 | front-end implementation defined. */ |
7c226435 | 853 | DEFTREECODE (SWITCH_EXPR, "switch_expr", 'e', 2) |
52a11cbf RH |
854 | |
855 | /* The exception object from the runtime. */ | |
856 | DEFTREECODE (EXC_PTR_EXPR, "exc_ptr_expr", 'e', 0) | |
857 | ||
6d77ee89 BK |
858 | /* |
859 | Local variables: | |
860 | mode:c | |
6d77ee89 BK |
861 | End: |
862 | */ |