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1.1 root 1: /* This file contains the definitions and documentation for the
2: tree codes used in the GNU C compiler.
3: Copyright (C) 1987, 1988 Free Software Foundation, Inc.
4:
5: This file is part of GNU CC.
6:
7: GNU CC 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 2, or (at your option)
10: any later version.
11:
12: GNU CC 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 GNU CC; see the file COPYING. If not, write to
19: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
20:
21:
22: /* The third argument can be:
23: "x" for an exceptional code (fits no category).
24: "t" for a type object code.
1.1.1.2 ! root 25: "b" for a lexical block.
1.1 root 26: "c" for codes for constants.
27: "d" for codes for declarations (also serving as variable refs).
28: "r" for codes for references to storage.
29: "<" for codes for comparison expressions.
30: "1" for codes for unary arithmetic expressions.
31: "2" for codes for binary arithmetic expressions.
32: "s" for codes for expressions with inherent side effects.
33: "e" for codes for other kinds of expressions. */
34:
35: /* For `r', `e', `<', `1', `2', `s' and `x' nodes,
36: the 4th element is the number of argument slots to allocate.
37: This determines the size of the tree node object. */
38:
39: /* Any erroneous construct is parsed into a node of this type.
40: This type of node is accepted without complaint in all contexts
41: by later parsing activities, to avoid multiple error messages
42: for one error.
43: No fields in these nodes are used except the TREE_CODE. */
44: DEFTREECODE (ERROR_MARK, "error_mark", "x", 0)
45:
46: /* Used to represent a name (such as, in the DECL_NAME of a decl node).
47: Internally it looks like a STRING_CST node.
48: There is only one IDENTIFIER_NODE ever made for any particular name.
49: Use `get_identifier' to get it (or create it, the first time). */
50: DEFTREECODE (IDENTIFIER_NODE, "identifier_node", "x", -1)
51:
52: /* Used to hold information to identify an operator (or combination
53: of two operators) considered as a `noun' rather than a `verb'.
54: The first operand is encoded in the TREE_TYPE field. */
55: DEFTREECODE (OP_IDENTIFIER, "op_identifier", "x", 2)
56:
57: /* Has the TREE_VALUE and TREE_PURPOSE fields. */
58: /* These nodes are made into lists by chaining through the
59: TREE_CHAIN field. The elements of the list live in the
60: TREE_VALUE fields, while TREE_PURPOSE fields are occasionally
61: used as well to get the effect of Lisp association lists. */
62: DEFTREECODE (TREE_LIST, "tree_list", "x", 2)
63:
64: /* These nodes contain an array of tree nodes. */
65: DEFTREECODE (TREE_VEC, "tree_vec", "x", 2)
66:
67: /* A symbol binding block. These are arranged in a tree,
68: where the BLOCK_SUBBLOCKS field contains a chain of subblocks
69: chained through the BLOCK_CHAIN field.
70: BLOCK_SUPERCONTEXT points to the parent block.
1.1.1.2 ! root 71: For a block which represents the outermost scope of a function, it
! 72: points to the FUNCTION_DECL node.
1.1 root 73: BLOCK_VARS points to a chain of decl nodes.
74: BLOCK_TYPE_TAGS points to a chain of types which have their own names.
1.1.1.2 ! root 75: BLOCK_CHAIN points to the next BLOCK at the same level.
! 76: BLOCK_ABSTRACT_ORIGIN points to the original (abstract) tree node which
! 77: this block is an instance of, or else is NULL to indicate that this
! 78: block is not an instance of anything else. When non-NULL, the value
! 79: could either point to another BLOCK node or it could point to a
! 80: FUNCTION_DECL node (e.g. in the case of a block representing the
! 81: outermost scope of a particular inlining of a function).
! 82: BLOCK_ABSTRACT is non-zero if the block represents an abstract
! 83: instance of a block (i.e. one which is nested within an abstract
! 84: instance of a inline function. */
! 85: DEFTREECODE (BLOCK, "block", "b", 0)
1.1 root 86:
87: /* Each data type is represented by a tree node whose code is one of
88: the following: */
89: /* Each node that represents a data type has a component TYPE_SIZE
90: containing a tree that is an expression for the size in bits.
91: The TYPE_MODE contains the machine mode for values of this type.
92: The TYPE_POINTER_TO field contains a type for a pointer to this type,
93: or zero if no such has been created yet.
94: The TYPE_NEXT_VARIANT field is used to chain together types
95: that are variants made by type modifiers such as "const" and "volatile".
96: The TYPE_MAIN_VARIANT field, in any member of such a chain,
97: points to the start of the chain.
98: The TYPE_NONCOPIED_PARTS field is a list specifying which parts
99: of an object of this type should *not* be copied by assignment.
100: The TREE_PURPOSE of each element is the offset of the part
101: and the TREE_VALUE is the size in bits of the part.
102: The TYPE_NAME field contains info on the name used in the program
103: for this type (for GDB symbol table output). It is either a
104: TYPE_DECL node, for types that are typedefs, or an IDENTIFIER_NODE
105: in the case of structs, unions or enums that are known with a tag,
106: or zero for types that have no special name.
1.1.1.2 ! root 107: The TYPE_CONTEXT for any sort of type which could have a name or
! 108: which could have named members (e.g. tagged types in C/C++) will
! 109: point to the node which represents the scope of the given type, or
! 110: will be NULL_TREE if the type has "file scope". For most types, this
! 111: will point to a BLOCK node or a FUNCTION_DECL node, but it could also
! 112: point to a FUNCTION_TYPE node (for types whose scope is limited to the
1.1 root 113: formal parameter list of some function type specification) or it
1.1.1.2 ! root 114: could point to a RECORD_TYPE or UNION_TYPE node (for C++ "member" types).
1.1 root 115: For non-tagged-types, TYPE_CONTEXT need not be set to anything in
1.1.1.2 ! root 116: particular, since any type which is of some type category (e.g.
! 117: an array type or a function type) which cannot either have a name
! 118: itself or have named members doesn't really have a "scope" per se. */
1.1 root 119: /* TREE_CHAIN is used for ENUMERAL_TYPE, RECORD_TYPE and UNION_TYPE
120: nodes used as forward-references to names; see below. */
121:
122: DEFTREECODE (VOID_TYPE, "void_type", "t", 0) /* The void type in C */
123:
124: /* Integer types in all languages, including char in C. */
125: /* Has components TYPE_MIN_VALUE, TYPE_MAX_VALUE (expressions, inclusive)
126: and TYPE_PRECISION (number of bits used by this type).
127: In the case of a subrange type in Pascal, the TREE_TYPE
128: of this will point at the supertype (another INTEGER_TYPE).
129: Otherwise, the TREE_TYPE is zero. */
130: DEFTREECODE (INTEGER_TYPE, "integer_type", "t", 0)
131:
132: /* C's float and double. Different floating types are distinguished
133: by machine mode and by the TYPE_SIZE and the TYPE_PRECISION. */
134: DEFTREECODE (REAL_TYPE, "real_type", "t", 0)
135:
136: /* Complex number types. The TREE_TYPE field is the data type
137: of the real and imaginary parts. */
138: DEFTREECODE (COMPLEX_TYPE, "complex_type", "t", 0)
139:
140: /* C enums. The type node looks just like an INTEGER_TYPE node.
141: The symbols for the values of the enum type are defined by
142: CONST_DECL nodes, but the type does not point to them;
143: however, the TREE_VALUES is a list in which each elements' TREE_PURPOSE
144: is a name and the TREE_VALUE is the value (an INTEGER_CST node). */
145: /* A forward reference `enum foo' when no enum named foo is defined yet
146: has zero (a null pointer) in its TYPE_SIZE. The tag name is in
147: the TYPE_NAME field. If the type is later defined, the normal
148: fields are filled in.
149: RECORD_TYPE and UNION_TYPE forward refs are treated similarly. */
150: DEFTREECODE (ENUMERAL_TYPE, "enumeral_type", "t", 0)
151:
152: /* Pascal's boolean type (true or false are the only values);
153: no special fields needed. */
154: DEFTREECODE (BOOLEAN_TYPE, "boolean_type", "t", 0)
155:
156: /* CHAR in Pascal; not used in C.
157: No special fields needed. */
158: DEFTREECODE (CHAR_TYPE, "char_type", "t", 0)
159:
160: /* All pointer-to-x types have code POINTER_TYPE.
161: The TREE_TYPE points to the node for the type pointed to. */
162: DEFTREECODE (POINTER_TYPE, "pointer_type", "t", 0)
163:
164: /* An offset is a pointer relative to an object.
165: The TREE_TYPE field is the type of the object at the offset.
166: The TYPE_OFFSET_BASETYPE points to the node for the type of object
167: that the offset is relative to. */
168: DEFTREECODE (OFFSET_TYPE, "offset_type", "t", 0)
169:
170: /* A reference is like a pointer except that it is coerced
171: automatically to the value it points to. Used in C++. */
172: DEFTREECODE (REFERENCE_TYPE, "reference_type", "t", 0)
173:
174: /* METHOD_TYPE is the type of a function which takes an extra first
175: argument for "self", which is not present in the declared argument list.
176: The TREE_TYPE is the return type of the method. The TYPE_METHOD_BASETYPE
177: is the type of "self". TYPE_ARG_TYPES is the real argument list, which
178: includes the hidden argument for "self". */
179: DEFTREECODE (METHOD_TYPE, "method_type", "t", 0)
180:
181: /* Used for Pascal; details not determined right now. */
182: DEFTREECODE (FILE_TYPE, "file_type", "t", 0)
183:
184: /* Types of arrays. Special fields:
185: TREE_TYPE Type of an array element.
186: TYPE_DOMAIN Type to index by.
187: Its range of values specifies the array length.
188: TYPE_SEP Expression for units from one elt to the next.
189: TYPE_SEP_UNIT Number of bits in a unit for previous.
190: The field TYPE_POINTER_TO (TREE_TYPE (array_type)) is always nonzero
191: and holds the type to coerce a value of that array type to in C. */
192: /* Array types in C or Pascal */
193: DEFTREECODE (ARRAY_TYPE, "array_type", "t", 0)
194:
195: /* Types of sets for Pascal. Special fields are the same as
196: in an array type. The target type is always a boolean type. */
197: DEFTREECODE (SET_TYPE, "set_type", "t", 0)
198:
199: /* Not known whether Pascal really needs this
200: or what it should contain. */
201: DEFTREECODE (STRING_TYPE, "string_type", "t", 0)
202:
203: /* Struct in C, or record in Pascal. */
204: /* Special fields:
205: TYPE_FIELDS chain of FIELD_DECLs for the fields of the struct.
206: A few may need to be added for Pascal. */
207: /* See the comment above, before ENUMERAL_TYPE, for how
208: forward references to struct tags are handled in C. */
209: DEFTREECODE (RECORD_TYPE, "record_type", "t", 0)
210:
211: /* Union in C. Like a struct, except that the offsets of the fields
212: will all be zero. */
213: /* See the comment above, before ENUMERAL_TYPE, for how
214: forward references to union tags are handled in C. */
215: DEFTREECODE (UNION_TYPE, "union_type", "t", 0) /* C union type */
216:
217: /* Type of functions. Special fields:
218: TREE_TYPE type of value returned.
219: TYPE_ARG_TYPES list of types of arguments expected.
220: this list is made of TREE_LIST nodes.
221: Types of "Procedures" in languages where they are different from functions
222: have code FUNCTION_TYPE also, but then TREE_TYPE is zero or void type. */
223: DEFTREECODE (FUNCTION_TYPE, "function_type", "t", 0)
224:
225: /* This is a language-specific kind of type.
226: Its meaning is defined by the language front end.
227: layout_type does not know how to lay this out,
228: so the front-end must do so manually. */
229: DEFTREECODE (LANG_TYPE, "lang_type", "t", 0)
230:
231: /* Expressions */
232:
233: /* First, the constants. */
234:
235: /* Contents are in TREE_INT_CST_LOW and TREE_INT_CST_HIGH fields,
236: 32 bits each, giving us a 64 bit constant capability.
237: Note: constants of type char in Pascal are INTEGER_CST,
238: and so are pointer constants such as nil in Pascal or NULL in C.
239: `(int *) 1' in C also results in an INTEGER_CST. */
240: DEFTREECODE (INTEGER_CST, "integer_cst", "c", 2)
241:
242: /* Contents are in TREE_REAL_CST field. Also there is TREE_CST_RTL. */
243: DEFTREECODE (REAL_CST, "real_cst", "c", 3)
244:
245: /* Contents are in TREE_REALPART and TREE_IMAGPART fields,
246: whose contents are other constant nodes.
247: Also there is TREE_CST_RTL. */
248: DEFTREECODE (COMPLEX_CST, "complex_cst", "c", 3)
249:
250: /* Contents are TREE_STRING_LENGTH and TREE_STRING_POINTER fields.
251: Also there is TREE_CST_RTL. */
252: DEFTREECODE (STRING_CST, "string_cst", "c", 3)
253:
254: /* Declarations. All references to names are represented as ..._DECL nodes.
255: The decls in one binding context are chained through the TREE_CHAIN field.
256: Each DECL has a DECL_NAME field which contains an IDENTIFIER_NODE.
257: (Some decls, most often labels, may have zero as the DECL_NAME).
258: DECL_CONTEXT points to the node representing the context in which
259: this declaration has its scope. For FIELD_DECLs, this is the
1.1.1.2 ! root 260: RECORD_TYPE or UNION_TYPE node that the field is a member of. For
! 261: VAR_DECL, PARM_DECL, FUNCTION_DECL, LABEL_DECL, and CONST_DECL nodes,
! 262: this points to the FUNCTION_DECL for the containing function, or else
! 263: yields NULL_TREE if the given decl has "file scope".
! 264: DECL_ABSTRACT_ORIGIN, if non-NULL, points to the original (abstract)
! 265: ..._DECL node of which this decl is an (inlined or template expanded)
! 266: instance.
1.1 root 267: The TREE_TYPE field holds the data type of the object, when relevant.
268: LABEL_DECLs have no data type. For TYPE_DECL, the TREE_TYPE field
269: contents are the type whose name is being declared.
270: The DECL_ALIGN, DECL_SIZE,
271: and DECL_MODE fields exist in decl nodes just as in type nodes.
272: They are unused in LABEL_DECL, TYPE_DECL and CONST_DECL nodes.
273:
274: DECL_OFFSET holds an integer number of bits offset for the location.
275: DECL_VOFFSET holds an expression for a variable offset; it is
276: to be multiplied by DECL_VOFFSET_UNIT (an integer).
277: These fields are relevant only in FIELD_DECLs and PARM_DECLs.
278:
279: DECL_INITIAL holds the value to initialize a variable to,
280: or the value of a constant. For a function, it holds the body
281: (a node of type BLOCK representing the function's binding contour
282: and whose body contains the function's statements.) For a LABEL_DECL
283: in C, it is a flag, nonzero if the label's definition has been seen.
284:
285: PARM_DECLs use a special field:
286: DECL_ARG_TYPE is the type in which the argument is actually
287: passed, which may be different from its type within the function.
288:
289: FUNCTION_DECLs use four special fields:
290: DECL_ARGUMENTS holds a chain of PARM_DECL nodes for the arguments.
291: DECL_RESULT holds a RESULT_DECL node for the value of a function,
292: or it is 0 for a function that returns no value.
293: (C functions returning void have zero here.)
294: DECL_RESULT_TYPE holds the type in which the result is actually
295: returned. This is usually the same as the type of DECL_RESULT,
296: but (1) it may be a wider integer type and
297: (2) it remains valid, for the sake of inlining, even after the
298: function's compilation is done.
299: DECL_FUNCTION_CODE is a code number that is nonzero for
300: built-in functions. Its value is an enum built_in_function
301: that says which built-in function it is.
302:
303: DECL_SOURCE_FILE holds a filename string and DECL_SOURCE_LINE
304: holds a line number. In some cases these can be the location of
1.1.1.2 ! root 305: a reference, if no definition has been seen.
! 306:
! 307: DECL_ABSTRACT is non-zero if the decl represents an abstract instance
! 308: of a decl (i.e. one which is nested within an abstract instance of a
! 309: inline function. */
1.1 root 310:
311: DEFTREECODE (FUNCTION_DECL, "function_decl", "d", 0)
312: DEFTREECODE (LABEL_DECL, "label_decl", "d", 0)
313: DEFTREECODE (CONST_DECL, "const_decl", "d", 0)
314: DEFTREECODE (TYPE_DECL, "type_decl", "d", 0)
315: DEFTREECODE (VAR_DECL, "var_decl", "d", 0)
316: DEFTREECODE (PARM_DECL, "parm_decl", "d", 0)
317: DEFTREECODE (RESULT_DECL, "result_decl", "d", 0)
318: DEFTREECODE (FIELD_DECL, "field_decl", "d", 0)
319:
320: /* References to storage. */
321:
322: /* Value is structure or union component.
323: Operand 0 is the structure or union (an expression);
324: operand 1 is the field (a node of type FIELD_DECL). */
325: DEFTREECODE (COMPONENT_REF, "component_ref", "r", 2)
326:
327: /* Reference to a group of bits within an object. Similar to COMPONENT_REF
328: except the position is given explicitly rather than via a FIELD_DECL.
329: Operand 0 is the structure or union expression;
330: operand 1 is a tree giving the number of bits being referenced;
331: operand 2 is a tree giving the position of the first referenced bit.
332: The field can be either a signed or unsigned field;
333: TREE_UNSIGNED says which. */
334: DEFTREECODE (BIT_FIELD_REF, "bit_field_ref", "r", 3)
335:
336: /* C unary `*' or Pascal `^'. One operand, an expression for a pointer. */
337: DEFTREECODE (INDIRECT_REF, "indirect_ref", "r", 1)
338:
339: /* Reference to the contents of an offset
340: (a value whose type is an OFFSET_TYPE).
341: Operand 0 is the object within which the offset is taken.
342: Operand 1 is the offset. */
343: DEFTREECODE (OFFSET_REF, "offset_ref", "r", 2)
344:
345: /* Pascal `^` on a file. One operand, an expression for the file. */
346: DEFTREECODE (BUFFER_REF, "buffer_ref", "r", 1)
347:
348: /* Array indexing in languages other than C.
349: Operand 0 is the array; operand 1 is a list of indices
350: stored as a chain of TREE_LIST nodes. */
351: DEFTREECODE (ARRAY_REF, "array_ref", "r", 2)
352:
353: /* Constructor: return an aggregate value made from specified components.
354: In C, this is used only for structure and array initializers.
355: The first "operand" is really a pointer to the RTL,
356: for constant constructors only.
357: The second operand is a list of component values
358: made out of a chain of TREE_LIST nodes. */
359: DEFTREECODE (CONSTRUCTOR, "constructor", "e", 2)
360:
361: /* The expression types are mostly straightforward,
362: with the fourth argument of DEFTREECODE saying
363: how many operands there are.
364: Unless otherwise specified, the operands are expressions. */
365:
366: /* Contains two expressions to compute, one followed by the other.
367: the first value is ignored. The second one's value is used. */
368: DEFTREECODE (COMPOUND_EXPR, "compound_expr", "e", 2)
369:
370: /* Assignment expression. Operand 0 is the what to set; 1, the new value. */
371: DEFTREECODE (MODIFY_EXPR, "modify_expr", "e", 2)
372:
373: /* Initialization expression. Operand 0 is the variable to initialize;
374: Operand 1 is the initializer. */
375: DEFTREECODE (INIT_EXPR, "init_expr", "e", 2)
376:
377: /* For TARGET_EXPR, operand 0 is the target of an initialization,
378: operand 1 is the initializer for the target,
379: and operand 2 is the cleanup for this node, if any. */
380: DEFTREECODE (TARGET_EXPR, "target_expr", "e", 3)
381:
382: /* Conditional expression ( ... ? ... : ... in C).
383: Operand 0 is the condition.
384: Operand 1 is the then-value.
385: Operand 2 is the else-value. */
386: DEFTREECODE (COND_EXPR, "cond_expr", "e", 3)
387:
388: /* Declare local variables, including making RTL and allocating space.
389: Operand 0 is a chain of VAR_DECL nodes for the variables.
390: Operand 1 is the body, the expression to be computed using
391: the variables. The value of operand 1 becomes that of the BIND_EXPR.
392: Operand 2 is the BLOCK that corresponds to these bindings
393: for debugging purposes. If this BIND_EXPR is actually expanded,
394: that sets the TREE_USED flag in the BLOCK.
395:
396: The BIND_EXPR is not responsible for informing parsers
397: about these variables. If the body is coming from the input file,
398: then the code that creates the BIND_EXPR is also responsible for
399: informing the parser of the variables.
400:
401: If the BIND_EXPR is ever expanded, its TREE_USED flag is set.
402: This tells the code for debugging symbol tables not to ignore the BIND_EXPR.
403: If the BIND_EXPR should be output for debugging but will not be expanded,
404: set the TREE_USED flag by hand.
405:
406: In order for the BIND_EXPR to be known at all, the code that creates it
407: must also install it as a subblock in the tree of BLOCK
408: nodes for the function. */
409: DEFTREECODE (BIND_EXPR, "bind_expr", "e", 3)
410:
411: /* Function call. Operand 0 is the function.
412: Operand 1 is the argument list, a list of expressions
413: made out of a chain of TREE_LIST nodes.
414: There is no operand 2. That slot is used for the
415: CALL_EXPR_RTL macro (see preexpand_calls). */
416: DEFTREECODE (CALL_EXPR, "call_expr", "e", 3)
417:
418: /* Call a method. Operand 0 is the method, whose type is a METHOD_TYPE.
419: Operand 1 is the expression for "self".
420: Operand 2 is the list of explicit arguments. */
421: DEFTREECODE (METHOD_CALL_EXPR, "method_call_expr", "e", 4)
422:
423: /* Specify a value to compute along with its corresponding cleanup.
424: Operand 0 argument is an expression whose value needs a cleanup.
425: Operand 1 is an RTL_EXPR which will eventually represent that value.
426: Operand 2 is the cleanup expression for the object.
427: The RTL_EXPR is used in this expression, which is how the expression
428: manages to act on the proper value.
429: The cleanup is executed when the value is no longer needed,
430: which is not at precisely the same time that this value is computed. */
431: DEFTREECODE (WITH_CLEANUP_EXPR, "with_cleanup_expr", "e", 3)
432:
433: /* Simple arithmetic. Operands must have the same machine mode
434: and the value shares that mode. */
435: DEFTREECODE (PLUS_EXPR, "plus_expr", "2", 2)
436: DEFTREECODE (MINUS_EXPR, "minus_expr", "2", 2)
437: DEFTREECODE (MULT_EXPR, "mult_expr", "2", 2)
438:
439: /* Division for integer result that rounds the quotient toward zero. */
440: /* Operands must have the same machine mode.
441: In principle they may be real, but that is not currently supported.
442: The result is always fixed point, and it has the same type as the
443: operands if they are fixed point. */
444: DEFTREECODE (TRUNC_DIV_EXPR, "trunc_div_expr", "2", 2)
445:
446: /* Division for integer result that rounds the quotient toward infinity. */
447: DEFTREECODE (CEIL_DIV_EXPR, "ceil_div_expr", "2", 2)
448:
449: /* Division for integer result that rounds toward minus infinity. */
450: DEFTREECODE (FLOOR_DIV_EXPR, "floor_div_expr", "2", 2)
451:
452: /* Division for integer result that rounds toward nearest integer. */
453: DEFTREECODE (ROUND_DIV_EXPR, "round_div_expr", "2", 2)
454:
455: /* Four kinds of remainder that go with the four kinds of division. */
456: DEFTREECODE (TRUNC_MOD_EXPR, "trunc_mod_expr", "2", 2)
457: DEFTREECODE (CEIL_MOD_EXPR, "ceil_mod_expr", "2", 2)
458: DEFTREECODE (FLOOR_MOD_EXPR, "floor_mod_expr", "2", 2)
459: DEFTREECODE (ROUND_MOD_EXPR, "round_mod_expr", "2", 2)
460:
461: /* Division for real result. The two operands must have the same type.
462: In principle they could be integers, but currently only real
463: operands are supported. The result must have the same type
464: as the operands. */
465: DEFTREECODE (RDIV_EXPR, "rdiv_expr", "2", 2)
466:
467: /* Division which is not supposed to need rounding.
468: Used for pointer subtraction in C. */
469: DEFTREECODE (EXACT_DIV_EXPR, "exact_div_expr", "2", 2)
470:
471: /* Conversion of real to fixed point: four ways to round,
472: like the four ways to divide.
473: CONVERT_EXPR can also be used to convert a real to an integer,
474: and that is what is used in languages that do not have ways of
475: specifying which of these is wanted. Maybe these are not needed. */
476: DEFTREECODE (FIX_TRUNC_EXPR, "fix_trunc_expr", "1", 1)
477: DEFTREECODE (FIX_CEIL_EXPR, "fix_ceil_expr", "1", 1)
478: DEFTREECODE (FIX_FLOOR_EXPR, "fix_floor_expr", "1", 1)
479: DEFTREECODE (FIX_ROUND_EXPR, "fix_round_expr", "1", 1)
480:
481: /* Conversion of an integer to a real. */
482: DEFTREECODE (FLOAT_EXPR, "float_expr", "1", 1)
483:
484: /* Exponentiation. Operands may have any types;
485: constraints on value type are not known yet. */
486: DEFTREECODE (EXPON_EXPR, "expon_expr", "2", 2)
487:
488: /* Unary negation. Value has same type as operand. */
489: DEFTREECODE (NEGATE_EXPR, "negate_expr", "1", 1)
490:
491: DEFTREECODE (MIN_EXPR, "min_expr", "2", 2)
492: DEFTREECODE (MAX_EXPR, "max_expr", "2", 2)
493: DEFTREECODE (ABS_EXPR, "abs_expr", "1", 1)
494: DEFTREECODE (FFS_EXPR, "ffs_expr", "1", 1)
495:
496: /* Shift operations for shift and rotate.
497: Shift is supposed to mean logical shift if done on an
498: unsigned type, arithmetic shift on a signed type.
499: The second operand is the number of bits to
500: shift by, and must always have mode SImode.
501: The result has the same mode as the first operand. */
502: DEFTREECODE (LSHIFT_EXPR, "alshift_expr", "2", 2)
503: DEFTREECODE (RSHIFT_EXPR, "arshift_expr", "2", 2)
504: DEFTREECODE (LROTATE_EXPR, "lrotate_expr", "2", 2)
505: DEFTREECODE (RROTATE_EXPR, "rrotate_expr", "2", 2)
506:
507: /* Bitwise operations. Operands have same mode as result. */
508: DEFTREECODE (BIT_IOR_EXPR, "bit_ior_expr", "2", 2)
509: DEFTREECODE (BIT_XOR_EXPR, "bit_xor_expr", "2", 2)
510: DEFTREECODE (BIT_AND_EXPR, "bit_and_expr", "2", 2)
511: DEFTREECODE (BIT_ANDTC_EXPR, "bit_andtc_expr", "2", 2)
512: DEFTREECODE (BIT_NOT_EXPR, "bit_not_expr", "1", 1)
513:
514: /* Combination of boolean values or of integers considered only
515: as zero or nonzero. ANDIF and ORIF allow the second operand
516: not to be computed if the value of the expression is determined
517: from the first operand. AND and OR always compute the second
518: operand whether its value is needed or not (for side effects). */
519: DEFTREECODE (TRUTH_ANDIF_EXPR, "truth_andif_expr", "e", 2)
520: DEFTREECODE (TRUTH_ORIF_EXPR, "truth_orif_expr", "e", 2)
521: DEFTREECODE (TRUTH_AND_EXPR, "truth_and_expr", "2", 2)
522: DEFTREECODE (TRUTH_OR_EXPR, "truth_or_expr", "2", 2)
523: DEFTREECODE (TRUTH_NOT_EXPR, "truth_not_expr", "e", 1)
524:
525: /* Relational operators.
526: `EQ_EXPR' and `NE_EXPR' are allowed for any types.
527: The others are allowed only for integer (or pointer or enumeral)
528: or real types.
529: In all cases the operands will have the same type,
530: and the value is always the type used by the language for booleans. */
531: DEFTREECODE (LT_EXPR, "lt_expr", "<", 2)
532: DEFTREECODE (LE_EXPR, "le_expr", "<", 2)
533: DEFTREECODE (GT_EXPR, "gt_expr", "<", 2)
534: DEFTREECODE (GE_EXPR, "ge_expr", "<", 2)
535: DEFTREECODE (EQ_EXPR, "eq_expr", "<", 2)
536: DEFTREECODE (NE_EXPR, "ne_expr", "<", 2)
537:
538: /* Operations for Pascal sets. Not used now. */
539: DEFTREECODE (IN_EXPR, "in_expr", "2", 2)
540: DEFTREECODE (SET_LE_EXPR, "set_le_expr", "<", 2)
541: DEFTREECODE (CARD_EXPR, "card_expr", "1", 1)
542: DEFTREECODE (RANGE_EXPR, "range_expr", "2", 2)
543:
544: /* Represents a conversion of type of a value.
545: All conversions, including implicit ones, must be
546: represented by CONVERT_EXPR nodes. */
547: DEFTREECODE (CONVERT_EXPR, "convert_expr", "1", 1)
548:
549: /* Represents a conversion expected to require no code to be generated. */
550: DEFTREECODE (NOP_EXPR, "nop_expr", "1", 1)
551:
552: /* Value is same as argument, but guaranteed not an lvalue. */
553: DEFTREECODE (NON_LVALUE_EXPR, "non_lvalue_expr", "1", 1)
554:
555: /* Represents something we computed once and will use multiple times.
556: First operand is that expression. Second is the function decl
557: in which the SAVE_EXPR was created. The third operand is the RTL,
558: nonzero only after the expression has been computed. */
559: DEFTREECODE (SAVE_EXPR, "save_expr", "e", 3)
560:
561: /* Represents something whose RTL has already been expanded
562: as a sequence which should be emitted when this expression is expanded.
563: The first operand is the RTL to emit. It is the first of a chain of insns.
564: The second is the RTL expression for the result. */
565: DEFTREECODE (RTL_EXPR, "rtl_expr", "e", 2)
566:
567: /* & in C. Value is the address at which the operand's value resides.
568: Operand may have any mode. Result mode is Pmode. */
569: DEFTREECODE (ADDR_EXPR, "addr_expr", "e", 1)
570:
571: /* Non-lvalue reference or pointer to an object. */
572: DEFTREECODE (REFERENCE_EXPR, "reference_expr", "e", 1)
573:
574: /* Operand is a function constant; result is a function variable value
575: of typeEPmode. Used only for languages that need static chains. */
576: DEFTREECODE (ENTRY_VALUE_EXPR, "entry_value_expr", "e", 1)
577:
578: /* Given two real or integer operands of the same type,
579: returns a complex value of the corresponding complex type. */
580: DEFTREECODE (COMPLEX_EXPR, "complex_expr", "2", 2)
581:
582: /* Complex conjugate of operand. Used only on complex types.
583: The value has the same type as the operand. */
584: DEFTREECODE (CONJ_EXPR, "conj_expr", "1", 1)
585:
586: /* Used only on an operand of complex type, these return
587: a value of the corresponding component type. */
588: DEFTREECODE (REALPART_EXPR, "realpart_expr", "1", 1)
589: DEFTREECODE (IMAGPART_EXPR, "imagpart_expr", "1", 1)
590:
591: /* Nodes for ++ and -- in C.
592: The second arg is how much to increment or decrement by.
593: For a pointer, it would be the size of the object pointed to. */
594: DEFTREECODE (PREDECREMENT_EXPR, "predecrement_expr", "e", 2)
595: DEFTREECODE (PREINCREMENT_EXPR, "preincrement_expr", "e", 2)
596: DEFTREECODE (POSTDECREMENT_EXPR, "postdecrement_expr", "e", 2)
597: DEFTREECODE (POSTINCREMENT_EXPR, "postincrement_expr", "e", 2)
598:
599: /* These types of expressions have no useful value,
600: and always have side effects. */
601:
602: /* A label definition, encapsulated as a statement.
603: Operand 0 is the LABEL_DECL node for the label that appears here.
604: The type should be void and the value should be ignored. */
605: DEFTREECODE (LABEL_EXPR, "label_expr", "s", 1)
606:
607: /* GOTO. Operand 0 is a LABEL_DECL node.
608: The type should be void and the value should be ignored. */
609: DEFTREECODE (GOTO_EXPR, "goto_expr", "s", 1)
610:
611: /* RETURN. Evaluates operand 0, then returns from the current function.
612: Presumably that operand is an assignment that stores into the
613: RESULT_DECL that hold the value to be returned.
614: The operand may be null.
615: The type should be void and the value should be ignored. */
616: DEFTREECODE (RETURN_EXPR, "return_expr", "s", 1)
617:
618: /* Exit the inner most loop conditionally. Operand 0 is the condition.
619: The type should be void and the value should be ignored. */
620: DEFTREECODE (EXIT_EXPR, "exit_expr", "s", 1)
621:
622: /* A loop. Operand 0 is the body of the loop.
623: It must contain an EXIT_EXPR or is an infinite loop.
624: The type should be void and the value should be ignored. */
625: DEFTREECODE (LOOP_EXPR, "loop_expr", "s", 1)
626:
627: /*
628: Local variables:
629: mode:c
630: version-control: t
631: End:
632: */
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