/* This file contains the definitions and documentation for the
- tree codes used in the GNU C compiler.
- Copyright (C) 1987, 1988 Free Software Foundation, Inc.
+ tree codes used in GCC.
+ Copyright (C) 1987, 1988, 1993, 1995, 1997, 1998, 2000, 2001, 2004
+ Free Software Foundation, Inc.
-This file is part of GNU CC.
+This file is part of GCC.
-GNU CC is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 2, or (at your option) any later
+version.
-GNU CC is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+for more details.
You should have received a copy of the GNU General Public License
-along with GNU CC; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+along with GCC; see the file COPYING. If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA. */
/* The third argument can be:
- "x" for an exceptional code (fits no category).
- "t" for a type object code.
- "b" for a lexical block.
- "c" for codes for constants.
- "d" for codes for declarations (also serving as variable refs).
- "r" for codes for references to storage.
- "<" for codes for comparison expressions.
- "1" for codes for unary arithmetic expressions.
- "2" for codes for binary arithmetic expressions.
- "s" for codes for expressions with inherent side effects.
- "e" for codes for other kinds of expressions. */
-
-/* For `r', `e', `<', `1', `2', `s' and `x' nodes,
- the 4th element is the number of argument slots to allocate.
- This determines the size of the tree node object. */
+ 'x' for an exceptional code (fits no category).
+ 't' for a type object code.
+ 'b' for a lexical block.
+ 'c' for codes for constants.
+ 'd' for codes for declarations (also serving as variable refs).
+ 'r' for codes for references to storage.
+ '<' for codes for comparison expressions.
+ '1' for codes for unary arithmetic expressions.
+ '2' for codes for binary arithmetic expressions.
+ 's' for codes for "statement" expressions, which have side-effects,
+ but usually no interesting value.
+ 'e' for codes for other kinds of expressions. */
+
+/* For `r', `e', `<', `1', `2', and `s' nodes, which use struct
+ tree_exp, the 4th element is the number of argument slots to
+ allocate. This determines the size of the tree node object.
+ Other nodes use different structures, and the size is determined
+ by the tree_union member structure; the 4th element should be
+ zero. Languages that define language-specific 'x' or 'c' codes
+ must define the tree_size langhook to say how big they are. */
/* Any erroneous construct is parsed into a node of this type.
This type of node is accepted without complaint in all contexts
by later parsing activities, to avoid multiple error messages
for one error.
No fields in these nodes are used except the TREE_CODE. */
-DEFTREECODE (ERROR_MARK, "error_mark", "x", 0)
+DEFTREECODE (ERROR_MARK, "error_mark", 'x', 0)
/* Used to represent a name (such as, in the DECL_NAME of a decl node).
Internally it looks like a STRING_CST node.
There is only one IDENTIFIER_NODE ever made for any particular name.
Use `get_identifier' to get it (or create it, the first time). */
-DEFTREECODE (IDENTIFIER_NODE, "identifier_node", "x", -1)
-
-/* Used to hold information to identify an operator (or combination
- of two operators) considered as a `noun' rather than a `verb'.
- The first operand is encoded in the TREE_TYPE field. */
-DEFTREECODE (OP_IDENTIFIER, "op_identifier", "x", 2)
+DEFTREECODE (IDENTIFIER_NODE, "identifier_node", 'x', 0)
/* Has the TREE_VALUE and TREE_PURPOSE fields. */
/* These nodes are made into lists by chaining through the
TREE_CHAIN field. The elements of the list live in the
TREE_VALUE fields, while TREE_PURPOSE fields are occasionally
used as well to get the effect of Lisp association lists. */
-DEFTREECODE (TREE_LIST, "tree_list", "x", 2)
+DEFTREECODE (TREE_LIST, "tree_list", 'x', 0)
/* These nodes contain an array of tree nodes. */
-DEFTREECODE (TREE_VEC, "tree_vec", "x", 2)
+DEFTREECODE (TREE_VEC, "tree_vec", 'x', 0)
/* A symbol binding block. These are arranged in a tree,
where the BLOCK_SUBBLOCKS field contains a chain of subblocks
could either point to another BLOCK node or it could point to a
FUNCTION_DECL node (e.g. in the case of a block representing the
outermost scope of a particular inlining of a function).
- BLOCK_ABSTRACT is non-zero if the block represents an abstract
+ BLOCK_ABSTRACT is nonzero if the block represents an abstract
instance of a block (i.e. one which is nested within an abstract
- instance of a inline function. */
-DEFTREECODE (BLOCK, "block", "b", 0)
+ instance of an inline function).
+ TREE_ASM_WRITTEN is nonzero if the block was actually referenced
+ in the generated assembly. */
+DEFTREECODE (BLOCK, "block", 'b', 0)
\f
/* Each data type is represented by a tree node whose code is one of
the following: */
points to the start of the chain.
The TYPE_NONCOPIED_PARTS field is a list specifying which parts
of an object of this type should *not* be copied by assignment.
- The TREE_PURPOSE of each element is the offset of the part
- and the TREE_VALUE is the size in bits of the part.
+ The TREE_VALUE of each is a FIELD_DECL that should not be
+ copied. The TREE_PURPOSE is an initial value for that field when
+ an object of this type is initialized via an INIT_EXPR. It may
+ be NULL if no special value is required. Even the things in this
+ list are copied if the right-hand side of an assignment is known
+ to be a complete object (rather than being, perhaps, a subobject
+ of some other object.) The determination of what constitutes a
+ complete object is done by fixed_type_p.
The TYPE_NAME field contains info on the name used in the program
for this type (for GDB symbol table output). It is either a
TYPE_DECL node, for types that are typedefs, or an IDENTIFIER_NODE
will point to a BLOCK node or a FUNCTION_DECL node, but it could also
point to a FUNCTION_TYPE node (for types whose scope is limited to the
formal parameter list of some function type specification) or it
- could point to a RECORD_TYPE or UNION_TYPE node (for C++ "member" types).
+ could point to a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE node
+ (for C++ "member" types).
For non-tagged-types, TYPE_CONTEXT need not be set to anything in
particular, since any type which is of some type category (e.g.
an array type or a function type) which cannot either have a name
- itself or have named members doesn't really have a "scope" per se. */
-/* TREE_CHAIN is used for ENUMERAL_TYPE, RECORD_TYPE and UNION_TYPE
- nodes used as forward-references to names; see below. */
+ itself or have named members doesn't really have a "scope" per se.
+ The TREE_CHAIN field is used as a forward-references to names for
+ ENUMERAL_TYPE, RECORD_TYPE, UNION_TYPE, and QUAL_UNION_TYPE nodes;
+ see below. */
-DEFTREECODE (VOID_TYPE, "void_type", "t", 0) /* The void type in C */
+DEFTREECODE (VOID_TYPE, "void_type", 't', 0) /* The void type in C */
-/* Integer types in all languages, including char in C. */
-/* Has components TYPE_MIN_VALUE, TYPE_MAX_VALUE (expressions, inclusive)
+/* Integer types in all languages, including char in C.
+ Also used for sub-ranges of other discrete types.
+ Has components TYPE_MIN_VALUE, TYPE_MAX_VALUE (expressions, inclusive)
and TYPE_PRECISION (number of bits used by this type).
In the case of a subrange type in Pascal, the TREE_TYPE
- of this will point at the supertype (another INTEGER_TYPE).
+ of this will point at the supertype (another INTEGER_TYPE,
+ or an ENUMERAL_TYPE, CHAR_TYPE, or BOOLEAN_TYPE).
Otherwise, the TREE_TYPE is zero. */
-DEFTREECODE (INTEGER_TYPE, "integer_type", "t", 0)
+DEFTREECODE (INTEGER_TYPE, "integer_type", 't', 0)
/* C's float and double. Different floating types are distinguished
by machine mode and by the TYPE_SIZE and the TYPE_PRECISION. */
-DEFTREECODE (REAL_TYPE, "real_type", "t", 0)
+DEFTREECODE (REAL_TYPE, "real_type", 't', 0)
/* Complex number types. The TREE_TYPE field is the data type
of the real and imaginary parts. */
-DEFTREECODE (COMPLEX_TYPE, "complex_type", "t", 0)
+DEFTREECODE (COMPLEX_TYPE, "complex_type", 't', 0)
+
+/* Vector types. The TREE_TYPE field is the data type of the vector
+ elements. */
+DEFTREECODE (VECTOR_TYPE, "vector_type", 't', 0)
/* C enums. The type node looks just like an INTEGER_TYPE node.
The symbols for the values of the enum type are defined by
has zero (a null pointer) in its TYPE_SIZE. The tag name is in
the TYPE_NAME field. If the type is later defined, the normal
fields are filled in.
- RECORD_TYPE and UNION_TYPE forward refs are treated similarly. */
-DEFTREECODE (ENUMERAL_TYPE, "enumeral_type", "t", 0)
+ RECORD_TYPE, UNION_TYPE, and QUAL_UNION_TYPE forward refs are
+ treated similarly. */
+DEFTREECODE (ENUMERAL_TYPE, "enumeral_type", 't', 0)
/* Pascal's boolean type (true or false are the only values);
no special fields needed. */
-DEFTREECODE (BOOLEAN_TYPE, "boolean_type", "t", 0)
+DEFTREECODE (BOOLEAN_TYPE, "boolean_type", 't', 0)
/* CHAR in Pascal; not used in C.
No special fields needed. */
-DEFTREECODE (CHAR_TYPE, "char_type", "t", 0)
+DEFTREECODE (CHAR_TYPE, "char_type", 't', 0)
/* All pointer-to-x types have code POINTER_TYPE.
The TREE_TYPE points to the node for the type pointed to. */
-DEFTREECODE (POINTER_TYPE, "pointer_type", "t", 0)
+DEFTREECODE (POINTER_TYPE, "pointer_type", 't', 0)
/* An offset is a pointer relative to an object.
The TREE_TYPE field is the type of the object at the offset.
The TYPE_OFFSET_BASETYPE points to the node for the type of object
that the offset is relative to. */
-DEFTREECODE (OFFSET_TYPE, "offset_type", "t", 0)
+DEFTREECODE (OFFSET_TYPE, "offset_type", 't', 0)
/* A reference is like a pointer except that it is coerced
automatically to the value it points to. Used in C++. */
-DEFTREECODE (REFERENCE_TYPE, "reference_type", "t", 0)
+DEFTREECODE (REFERENCE_TYPE, "reference_type", 't', 0)
/* METHOD_TYPE is the type of a function which takes an extra first
argument for "self", which is not present in the declared argument list.
The TREE_TYPE is the return type of the method. The TYPE_METHOD_BASETYPE
is the type of "self". TYPE_ARG_TYPES is the real argument list, which
includes the hidden argument for "self". */
-DEFTREECODE (METHOD_TYPE, "method_type", "t", 0)
+DEFTREECODE (METHOD_TYPE, "method_type", 't', 0)
/* Used for Pascal; details not determined right now. */
-DEFTREECODE (FILE_TYPE, "file_type", "t", 0)
+DEFTREECODE (FILE_TYPE, "file_type", 't', 0)
/* Types of arrays. Special fields:
TREE_TYPE Type of an array element.
TYPE_DOMAIN Type to index by.
Its range of values specifies the array length.
- TYPE_SEP Expression for units from one elt to the next.
- TYPE_SEP_UNIT Number of bits in a unit for previous.
The field TYPE_POINTER_TO (TREE_TYPE (array_type)) is always nonzero
- and holds the type to coerce a value of that array type to in C. */
+ and holds the type to coerce a value of that array type to in C.
+ TYPE_STRING_FLAG indicates a string (in contrast to an array of chars)
+ in languages (such as Chill) that make a distinction. */
/* Array types in C or Pascal */
-DEFTREECODE (ARRAY_TYPE, "array_type", "t", 0)
+DEFTREECODE (ARRAY_TYPE, "array_type", 't', 0)
/* Types of sets for Pascal. Special fields are the same as
- in an array type. The target type is always a boolean type. */
-DEFTREECODE (SET_TYPE, "set_type", "t", 0)
-
-/* Not known whether Pascal really needs this
- or what it should contain. */
-DEFTREECODE (STRING_TYPE, "string_type", "t", 0)
+ in an array type. The target type is always a boolean type.
+ Used for both bitstrings and powersets in Chill;
+ TYPE_STRING_FLAG indicates a bitstring. */
+DEFTREECODE (SET_TYPE, "set_type", 't', 0)
/* Struct in C, or record in Pascal. */
/* Special fields:
- TYPE_FIELDS chain of FIELD_DECLs for the fields of the struct.
+ TYPE_FIELDS chain of FIELD_DECLs for the fields of the struct,
+ and VAR_DECLs, TYPE_DECLs and CONST_DECLs for record-scope variables,
+ types and enumerators.
A few may need to be added for Pascal. */
/* See the comment above, before ENUMERAL_TYPE, for how
forward references to struct tags are handled in C. */
-DEFTREECODE (RECORD_TYPE, "record_type", "t", 0)
+DEFTREECODE (RECORD_TYPE, "record_type", 't', 0)
/* Union in C. Like a struct, except that the offsets of the fields
will all be zero. */
/* See the comment above, before ENUMERAL_TYPE, for how
forward references to union tags are handled in C. */
-DEFTREECODE (UNION_TYPE, "union_type", "t", 0) /* C union type */
+DEFTREECODE (UNION_TYPE, "union_type", 't', 0) /* C union type */
+
+/* Similar to UNION_TYPE, except that the expressions in DECL_QUALIFIER
+ in each FIELD_DECL determine what the union contains. The first
+ field whose DECL_QUALIFIER expression is true is deemed to occupy
+ the union. */
+DEFTREECODE (QUAL_UNION_TYPE, "qual_union_type", 't', 0)
/* Type of functions. Special fields:
TREE_TYPE type of value returned.
this list is made of TREE_LIST nodes.
Types of "Procedures" in languages where they are different from functions
have code FUNCTION_TYPE also, but then TREE_TYPE is zero or void type. */
-DEFTREECODE (FUNCTION_TYPE, "function_type", "t", 0)
+DEFTREECODE (FUNCTION_TYPE, "function_type", 't', 0)
/* This is a language-specific kind of type.
Its meaning is defined by the language front end.
layout_type does not know how to lay this out,
so the front-end must do so manually. */
-DEFTREECODE (LANG_TYPE, "lang_type", "t", 0)
+DEFTREECODE (LANG_TYPE, "lang_type", 't', 0)
\f
/* Expressions */
Note: constants of type char in Pascal are INTEGER_CST,
and so are pointer constants such as nil in Pascal or NULL in C.
`(int *) 1' in C also results in an INTEGER_CST. */
-DEFTREECODE (INTEGER_CST, "integer_cst", "c", 2)
+DEFTREECODE (INTEGER_CST, "integer_cst", 'c', 0)
-/* Contents are in TREE_REAL_CST field. Also there is TREE_CST_RTL. */
-DEFTREECODE (REAL_CST, "real_cst", "c", 3)
+/* Contents are in TREE_REAL_CST field. */
+DEFTREECODE (REAL_CST, "real_cst", 'c', 0)
/* Contents are in TREE_REALPART and TREE_IMAGPART fields,
- whose contents are other constant nodes.
- Also there is TREE_CST_RTL. */
-DEFTREECODE (COMPLEX_CST, "complex_cst", "c", 3)
-
-/* Contents are TREE_STRING_LENGTH and TREE_STRING_POINTER fields.
- Also there is TREE_CST_RTL. */
-DEFTREECODE (STRING_CST, "string_cst", "c", 3)
-
-/* Declarations. All references to names are represented as ..._DECL nodes.
- The decls in one binding context are chained through the TREE_CHAIN field.
- Each DECL has a DECL_NAME field which contains an IDENTIFIER_NODE.
- (Some decls, most often labels, may have zero as the DECL_NAME).
- DECL_CONTEXT points to the node representing the context in which
- this declaration has its scope. For FIELD_DECLs, this is the
- RECORD_TYPE or UNION_TYPE node that the field is a member of. For
- VAR_DECL, PARM_DECL, FUNCTION_DECL, LABEL_DECL, and CONST_DECL nodes,
- this points to the FUNCTION_DECL for the containing function, or else
- yields NULL_TREE if the given decl has "file scope".
+ whose contents are other constant nodes. */
+DEFTREECODE (COMPLEX_CST, "complex_cst", 'c', 0)
+
+/* Contents are in TREE_VECTOR_CST_ELTS field. */
+DEFTREECODE (VECTOR_CST, "vector_cst", 'c', 0)
+
+/* Contents are TREE_STRING_LENGTH and TREE_STRING_POINTER fields. */
+DEFTREECODE (STRING_CST, "string_cst", 'c', 0)
+
+/* Declarations. All references to names are represented as ..._DECL
+ nodes. The decls in one binding context are chained through the
+ TREE_CHAIN field. Each DECL has a DECL_NAME field which contains
+ an IDENTIFIER_NODE. (Some decls, most often labels, may have zero
+ as the DECL_NAME). DECL_CONTEXT points to the node representing
+ the context in which this declaration has its scope. For
+ FIELD_DECLs, this is the RECORD_TYPE, UNION_TYPE, or
+ QUAL_UNION_TYPE node that the field is a member of. For VAR_DECL,
+ PARM_DECL, FUNCTION_DECL, LABEL_DECL, and CONST_DECL nodes, this
+ points to either the FUNCTION_DECL for the containing function, the
+ RECORD_TYPE or UNION_TYPE for the containing type, or NULL_TREE or
+ a TRANSLATION_UNIT_DECL if the given decl has "file scope".
DECL_ABSTRACT_ORIGIN, if non-NULL, points to the original (abstract)
..._DECL node of which this decl is an (inlined or template expanded)
instance.
and DECL_MODE fields exist in decl nodes just as in type nodes.
They are unused in LABEL_DECL, TYPE_DECL and CONST_DECL nodes.
- DECL_OFFSET holds an integer number of bits offset for the location.
- DECL_VOFFSET holds an expression for a variable offset; it is
- to be multiplied by DECL_VOFFSET_UNIT (an integer).
+ DECL_FIELD_BIT_OFFSET holds an integer number of bits offset for
+ the location. DECL_VOFFSET holds an expression for a variable
+ offset; it is to be multiplied by DECL_VOFFSET_UNIT (an integer).
These fields are relevant only in FIELD_DECLs and PARM_DECLs.
DECL_INITIAL holds the value to initialize a variable to,
DECL_RESULT holds a RESULT_DECL node for the value of a function,
or it is 0 for a function that returns no value.
(C functions returning void have zero here.)
- DECL_RESULT_TYPE holds the type in which the result is actually
- returned. This is usually the same as the type of DECL_RESULT,
- but (1) it may be a wider integer type and
- (2) it remains valid, for the sake of inlining, even after the
- function's compilation is done.
+ The TREE_TYPE field is the type in which the result is actually
+ returned. This is usually the same as the return type of the
+ FUNCTION_DECL, but it may be a wider integer type because of
+ promotion.
DECL_FUNCTION_CODE is a code number that is nonzero for
built-in functions. Its value is an enum built_in_function
that says which built-in function it is.
holds a line number. In some cases these can be the location of
a reference, if no definition has been seen.
- DECL_ABSTRACT is non-zero if the decl represents an abstract instance
+ DECL_ABSTRACT is nonzero if the decl represents an abstract instance
of a decl (i.e. one which is nested within an abstract instance of a
inline function. */
-DEFTREECODE (FUNCTION_DECL, "function_decl", "d", 0)
-DEFTREECODE (LABEL_DECL, "label_decl", "d", 0)
-DEFTREECODE (CONST_DECL, "const_decl", "d", 0)
-DEFTREECODE (TYPE_DECL, "type_decl", "d", 0)
-DEFTREECODE (VAR_DECL, "var_decl", "d", 0)
-DEFTREECODE (PARM_DECL, "parm_decl", "d", 0)
-DEFTREECODE (RESULT_DECL, "result_decl", "d", 0)
-DEFTREECODE (FIELD_DECL, "field_decl", "d", 0)
+DEFTREECODE (FUNCTION_DECL, "function_decl", 'd', 0)
+DEFTREECODE (LABEL_DECL, "label_decl", 'd', 0)
+DEFTREECODE (CONST_DECL, "const_decl", 'd', 0)
+DEFTREECODE (TYPE_DECL, "type_decl", 'd', 0)
+DEFTREECODE (VAR_DECL, "var_decl", 'd', 0)
+DEFTREECODE (PARM_DECL, "parm_decl", 'd', 0)
+DEFTREECODE (RESULT_DECL, "result_decl", 'd', 0)
+DEFTREECODE (FIELD_DECL, "field_decl", 'd', 0)
+
+/* A namespace declaration. Namespaces appear in DECL_CONTEXT of other
+ _DECLs, providing a hierarchy of names. */
+DEFTREECODE (NAMESPACE_DECL, "namespace_decl", 'd', 0)
+
+/* A translation unit. This is not technically a declaration, since it
+ can't be looked up, but it's close enough. */
+DEFTREECODE (TRANSLATION_UNIT_DECL, "translation_unit_decl", 'd', 0)
\f
/* References to storage. */
/* Value is structure or union component.
Operand 0 is the structure or union (an expression);
operand 1 is the field (a node of type FIELD_DECL). */
-DEFTREECODE (COMPONENT_REF, "component_ref", "r", 2)
+DEFTREECODE (COMPONENT_REF, "component_ref", 'r', 2)
/* Reference to a group of bits within an object. Similar to COMPONENT_REF
except the position is given explicitly rather than via a FIELD_DECL.
operand 2 is a tree giving the position of the first referenced bit.
The field can be either a signed or unsigned field;
TREE_UNSIGNED says which. */
-DEFTREECODE (BIT_FIELD_REF, "bit_field_ref", "r", 3)
+DEFTREECODE (BIT_FIELD_REF, "bit_field_ref", 'r', 3)
/* C unary `*' or Pascal `^'. One operand, an expression for a pointer. */
-DEFTREECODE (INDIRECT_REF, "indirect_ref", "r", 1)
-
-/* Reference to the contents of an offset
- (a value whose type is an OFFSET_TYPE).
- Operand 0 is the object within which the offset is taken.
- Operand 1 is the offset. */
-DEFTREECODE (OFFSET_REF, "offset_ref", "r", 2)
+DEFTREECODE (INDIRECT_REF, "indirect_ref", 'r', 1)
/* Pascal `^` on a file. One operand, an expression for the file. */
-DEFTREECODE (BUFFER_REF, "buffer_ref", "r", 1)
+DEFTREECODE (BUFFER_REF, "buffer_ref", 'r', 1)
-/* Array indexing in languages other than C.
- Operand 0 is the array; operand 1 is a list of indices
- stored as a chain of TREE_LIST nodes. */
-DEFTREECODE (ARRAY_REF, "array_ref", "r", 2)
+/* Array indexing.
+ Operand 0 is the array; operand 1 is a (single) array index. */
+DEFTREECODE (ARRAY_REF, "array_ref", 'r', 2)
+
+/* Likewise, except that the result is a range ("slice") of the array. The
+ starting index of the resulting array is taken from operand 1 and the size
+ of the range is taken from the type of the expression. */
+DEFTREECODE (ARRAY_RANGE_REF, "array_range_ref", 'r', 2)
+
+/* Vtable indexing. Carries data useful for emitting information
+ for vtable garbage collection.
+ Operand 0: an array_ref (or equivalent expression)
+ Operand 1: the vtable base (must be a var_decl)
+ Operand 2: index into vtable (must be an integer_cst). */
+DEFTREECODE (VTABLE_REF, "vtable_ref", 'r', 3)
/* Constructor: return an aggregate value made from specified components.
In C, this is used only for structure and array initializers.
- The first "operand" is really a pointer to the RTL,
- for constant constructors only.
- The second operand is a list of component values
- made out of a chain of TREE_LIST nodes. */
-DEFTREECODE (CONSTRUCTOR, "constructor", "e", 2)
-
-/* The expression types are mostly straightforward,
- with the fourth argument of DEFTREECODE saying
- how many operands there are.
- Unless otherwise specified, the operands are expressions. */
+ Also used for SET_TYPE in Chill (and potentially Pascal).
+ The operand is a list of component values made out of a chain of
+ TREE_LIST nodes.
+
+ For ARRAY_TYPE:
+ The TREE_PURPOSE of each node is the corresponding index.
+ If the TREE_PURPOSE is a RANGE_EXPR, it is a short-hand for many nodes,
+ one for each index in the range. (If the corresponding TREE_VALUE
+ has side-effects, they are evaluated once for each element. Wrap the
+ value in a SAVE_EXPR if you want to evaluate side effects only once.)
+
+ For RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE:
+ The TREE_PURPOSE of each node is a FIELD_DECL.
+
+ For SET_TYPE:
+ The TREE_VALUE specifies a value (index) in the set that is true.
+ If TREE_PURPOSE is non-NULL, it specifies the lower limit of a
+ range of true values. Elements not listed are false (not in the set). */
+DEFTREECODE (CONSTRUCTOR, "constructor", 'e', 1)
+
+/* The expression types are mostly straightforward, with the fourth argument
+ of DEFTREECODE saying how many operands there are.
+ Unless otherwise specified, the operands are expressions and the
+ types of all the operands and the expression must all be the same. */
/* Contains two expressions to compute, one followed by the other.
- the first value is ignored. The second one's value is used. */
-DEFTREECODE (COMPOUND_EXPR, "compound_expr", "e", 2)
+ the first value is ignored. The second one's value is used. The
+ type of the first expression need not agree with the other types. */
+DEFTREECODE (COMPOUND_EXPR, "compound_expr", 'e', 2)
/* Assignment expression. Operand 0 is the what to set; 1, the new value. */
-DEFTREECODE (MODIFY_EXPR, "modify_expr", "e", 2)
+DEFTREECODE (MODIFY_EXPR, "modify_expr", 'e', 2)
/* Initialization expression. Operand 0 is the variable to initialize;
Operand 1 is the initializer. */
-DEFTREECODE (INIT_EXPR, "init_expr", "e", 2)
+DEFTREECODE (INIT_EXPR, "init_expr", 'e', 2)
/* For TARGET_EXPR, operand 0 is the target of an initialization,
operand 1 is the initializer for the target,
- and operand 2 is the cleanup for this node, if any. */
-DEFTREECODE (TARGET_EXPR, "target_expr", "e", 3)
+ and operand 2 is the cleanup for this node, if any.
+ and operand 3 is the saved initializer after this node has been
+ expanded once, this is so we can re-expand the tree later. */
+DEFTREECODE (TARGET_EXPR, "target_expr", 'e', 4)
/* Conditional expression ( ... ? ... : ... in C).
Operand 0 is the condition.
Operand 1 is the then-value.
- Operand 2 is the else-value. */
-DEFTREECODE (COND_EXPR, "cond_expr", "e", 3)
+ Operand 2 is the else-value.
+ Operand 0 may be of any type.
+ Operand 1 must have the same type as the entire expression, unless
+ it unconditionally throws an exception, in which case it should
+ have VOID_TYPE. The same constraints apply to operand 2. */
+DEFTREECODE (COND_EXPR, "cond_expr", 'e', 3)
/* Declare local variables, including making RTL and allocating space.
Operand 0 is a chain of VAR_DECL nodes for the variables.
In order for the BIND_EXPR to be known at all, the code that creates it
must also install it as a subblock in the tree of BLOCK
nodes for the function. */
-DEFTREECODE (BIND_EXPR, "bind_expr", "e", 3)
+DEFTREECODE (BIND_EXPR, "bind_expr", 'e', 3)
/* Function call. Operand 0 is the function.
Operand 1 is the argument list, a list of expressions
- made out of a chain of TREE_LIST nodes.
- There is no operand 2. That slot is used for the
- CALL_EXPR_RTL macro (see preexpand_calls). */
-DEFTREECODE (CALL_EXPR, "call_expr", "e", 3)
-
-/* Call a method. Operand 0 is the method, whose type is a METHOD_TYPE.
- Operand 1 is the expression for "self".
- Operand 2 is the list of explicit arguments. */
-DEFTREECODE (METHOD_CALL_EXPR, "method_call_expr", "e", 4)
+ made out of a chain of TREE_LIST nodes. */
+DEFTREECODE (CALL_EXPR, "call_expr", 'e', 2)
/* Specify a value to compute along with its corresponding cleanup.
Operand 0 argument is an expression whose value needs a cleanup.
- Operand 1 is an RTL_EXPR which will eventually represent that value.
- Operand 2 is the cleanup expression for the object.
+ Operand 1 is the cleanup expression for the object.
+ Operand 2 is an RTL_EXPR which will eventually represent that value.
The RTL_EXPR is used in this expression, which is how the expression
manages to act on the proper value.
- The cleanup is executed when the value is no longer needed,
- which is not at precisely the same time that this value is computed. */
-DEFTREECODE (WITH_CLEANUP_EXPR, "with_cleanup_expr", "e", 3)
-
-/* Simple arithmetic. Operands must have the same machine mode
- and the value shares that mode. */
-DEFTREECODE (PLUS_EXPR, "plus_expr", "2", 2)
-DEFTREECODE (MINUS_EXPR, "minus_expr", "2", 2)
-DEFTREECODE (MULT_EXPR, "mult_expr", "2", 2)
+ The cleanup is executed by the first enclosing CLEANUP_POINT_EXPR, if
+ it exists, otherwise it is the responsibility of the caller to manually
+ call expand_start_target_temps/expand_end_target_temps, as needed.
+
+ This differs from TRY_CATCH_EXPR in that operand 2 is always
+ evaluated when an exception isn't thrown when cleanups are run. */
+DEFTREECODE (WITH_CLEANUP_EXPR, "with_cleanup_expr", 'e', 3)
+
+/* Specify a cleanup point.
+ Operand 0 is an expression that may have cleanups. If it does, those
+ cleanups are executed after the expression is expanded.
+
+ Note that if the expression is a reference to storage, it is forced out
+ of memory before the cleanups are run. This is necessary to handle
+ cases where the cleanups modify the storage referenced; in the
+ expression 't.i', if 't' is a struct with an integer member 'i' and a
+ cleanup which modifies 'i', the value of the expression depends on
+ whether the cleanup is run before or after 't.i' is evaluated. When
+ expand_expr is run on 't.i', it returns a MEM. This is not good enough;
+ the value of 't.i' must be forced out of memory.
+
+ As a consequence, the operand of a CLEANUP_POINT_EXPR must not have
+ BLKmode, because it will not be forced out of memory. */
+DEFTREECODE (CLEANUP_POINT_EXPR, "cleanup_point_expr", 'e', 1)
+
+/* The following two codes are used in languages that have types where
+ some field in an object of the type contains a value that is used in
+ the computation of another field's offset or size and/or the size of
+ the type. The positions and/or sizes of fields can vary from object
+ to object of the same type or even for one and the same object within
+ its scope.
+
+ Record types with discriminants in Ada or schema types in Pascal are
+ examples of such types. This mechanism is also used to create "fat
+ pointers" for unconstrained array types in Ada; the fat pointer is a
+ structure one of whose fields is a pointer to the actual array type
+ and the other field is a pointer to a template, which is a structure
+ containing the bounds of the array. The bounds in the type pointed
+ to by the first field in the fat pointer refer to the values in the
+ template.
+
+ When you wish to construct such a type you need "self-references"
+ that allow you to reference the object having this type from the
+ TYPE node, i.e. without having a variable instantiating this type.
+
+ Such a "self-references" is done using a PLACEHOLDER_EXPR. This is
+ a node that will later be replaced with the object being referenced.
+ Its type is that of the object and selects which object to use from
+ a chain of references (see below). No other slots are used in the
+ PLACEHOLDER_EXPR.
+
+ For example, if your type FOO is a RECORD_TYPE with a field BAR,
+ and you need the value of <variable>.BAR to calculate TYPE_SIZE
+ (FOO), just substitute <variable> above with a PLACEHOLDER_EXPR
+ whose TREE_TYPE is FOO. Then construct your COMPONENT_REF with
+ the PLACEHOLDER_EXPR as the first operand (which has the correct
+ type). Later, when the size is needed in the program, the back-end
+ will find this PLACEHOLDER_EXPR and generate code to calculate the
+ actual size at run-time. In the following, we describe how this
+ calculation is done.
+
+ When we wish to evaluate a size or offset, we check whether it
+ contains a PLACEHOLDER_EXPR. If it does, we construct a
+ WITH_RECORD_EXPR that contains both the expression we wish to
+ evaluate and an expression within which the object may be found.
+ The latter expression is the object itself in the simple case of an
+ Ada record with discriminant, but it can be the array in the case of
+ an unconstrained array.
+
+ In the latter case, we need the fat pointer, because the bounds of
+ the array can only be accessed from it. However, we rely here on the
+ fact that the expression for the array contains the dereference of
+ the fat pointer that obtained the array pointer.
+
+ Accordingly, when looking for the object to substitute in place of
+ a PLACEHOLDER_EXPR, we look down the first operand of the expression
+ passed as the second operand to WITH_RECORD_EXPR until we find
+ something of the desired type or reach a constant. */
+
+/* Denotes a record to later be supplied with a WITH_RECORD_EXPR when
+ evaluating this expression. The type of this expression is used to
+ find the record to replace it. */
+DEFTREECODE (PLACEHOLDER_EXPR, "placeholder_expr", 'x', 0)
+
+/* Provide an expression that references a record to be used in place
+ of a PLACEHOLDER_EXPR. The record to be used is the record within
+ operand 1 that has the same type as the PLACEHOLDER_EXPR in
+ operand 0. */
+DEFTREECODE (WITH_RECORD_EXPR, "with_record_expr", 'e', 2)
+
+/* Simple arithmetic. */
+DEFTREECODE (PLUS_EXPR, "plus_expr", '2', 2)
+DEFTREECODE (MINUS_EXPR, "minus_expr", '2', 2)
+DEFTREECODE (MULT_EXPR, "mult_expr", '2', 2)
/* Division for integer result that rounds the quotient toward zero. */
-/* Operands must have the same machine mode.
- In principle they may be real, but that is not currently supported.
- The result is always fixed point, and it has the same type as the
- operands if they are fixed point. */
-DEFTREECODE (TRUNC_DIV_EXPR, "trunc_div_expr", "2", 2)
+DEFTREECODE (TRUNC_DIV_EXPR, "trunc_div_expr", '2', 2)
/* Division for integer result that rounds the quotient toward infinity. */
-DEFTREECODE (CEIL_DIV_EXPR, "ceil_div_expr", "2", 2)
+DEFTREECODE (CEIL_DIV_EXPR, "ceil_div_expr", '2', 2)
/* Division for integer result that rounds toward minus infinity. */
-DEFTREECODE (FLOOR_DIV_EXPR, "floor_div_expr", "2", 2)
+DEFTREECODE (FLOOR_DIV_EXPR, "floor_div_expr", '2', 2)
/* Division for integer result that rounds toward nearest integer. */
-DEFTREECODE (ROUND_DIV_EXPR, "round_div_expr", "2", 2)
+DEFTREECODE (ROUND_DIV_EXPR, "round_div_expr", '2', 2)
/* Four kinds of remainder that go with the four kinds of division. */
-DEFTREECODE (TRUNC_MOD_EXPR, "trunc_mod_expr", "2", 2)
-DEFTREECODE (CEIL_MOD_EXPR, "ceil_mod_expr", "2", 2)
-DEFTREECODE (FLOOR_MOD_EXPR, "floor_mod_expr", "2", 2)
-DEFTREECODE (ROUND_MOD_EXPR, "round_mod_expr", "2", 2)
+DEFTREECODE (TRUNC_MOD_EXPR, "trunc_mod_expr", '2', 2)
+DEFTREECODE (CEIL_MOD_EXPR, "ceil_mod_expr", '2', 2)
+DEFTREECODE (FLOOR_MOD_EXPR, "floor_mod_expr", '2', 2)
+DEFTREECODE (ROUND_MOD_EXPR, "round_mod_expr", '2', 2)
-/* Division for real result. The two operands must have the same type.
- In principle they could be integers, but currently only real
- operands are supported. The result must have the same type
- as the operands. */
-DEFTREECODE (RDIV_EXPR, "rdiv_expr", "2", 2)
+/* Division for real result. */
+DEFTREECODE (RDIV_EXPR, "rdiv_expr", '2', 2)
/* Division which is not supposed to need rounding.
Used for pointer subtraction in C. */
-DEFTREECODE (EXACT_DIV_EXPR, "exact_div_expr", "2", 2)
+DEFTREECODE (EXACT_DIV_EXPR, "exact_div_expr", '2', 2)
/* Conversion of real to fixed point: four ways to round,
like the four ways to divide.
CONVERT_EXPR can also be used to convert a real to an integer,
and that is what is used in languages that do not have ways of
specifying which of these is wanted. Maybe these are not needed. */
-DEFTREECODE (FIX_TRUNC_EXPR, "fix_trunc_expr", "1", 1)
-DEFTREECODE (FIX_CEIL_EXPR, "fix_ceil_expr", "1", 1)
-DEFTREECODE (FIX_FLOOR_EXPR, "fix_floor_expr", "1", 1)
-DEFTREECODE (FIX_ROUND_EXPR, "fix_round_expr", "1", 1)
+DEFTREECODE (FIX_TRUNC_EXPR, "fix_trunc_expr", '1', 1)
+DEFTREECODE (FIX_CEIL_EXPR, "fix_ceil_expr", '1', 1)
+DEFTREECODE (FIX_FLOOR_EXPR, "fix_floor_expr", '1', 1)
+DEFTREECODE (FIX_ROUND_EXPR, "fix_round_expr", '1', 1)
/* Conversion of an integer to a real. */
-DEFTREECODE (FLOAT_EXPR, "float_expr", "1", 1)
+DEFTREECODE (FLOAT_EXPR, "float_expr", '1', 1)
+
+/* Unary negation. */
+DEFTREECODE (NEGATE_EXPR, "negate_expr", '1', 1)
-/* Exponentiation. Operands may have any types;
- constraints on value type are not known yet. */
-DEFTREECODE (EXPON_EXPR, "expon_expr", "2", 2)
+DEFTREECODE (MIN_EXPR, "min_expr", '2', 2)
+DEFTREECODE (MAX_EXPR, "max_expr", '2', 2)
-/* Unary negation. Value has same type as operand. */
-DEFTREECODE (NEGATE_EXPR, "negate_expr", "1", 1)
+/* Represents the absolute value of the operand.
-DEFTREECODE (MIN_EXPR, "min_expr", "2", 2)
-DEFTREECODE (MAX_EXPR, "max_expr", "2", 2)
-DEFTREECODE (ABS_EXPR, "abs_expr", "1", 1)
-DEFTREECODE (FFS_EXPR, "ffs_expr", "1", 1)
+ An ABS_EXPR must have either an INTEGER_TYPE or a REAL_TYPE. The
+ operand of the ABS_EXPR must have the same type. */
+DEFTREECODE (ABS_EXPR, "abs_expr", '1', 1)
/* Shift operations for shift and rotate.
- Shift is supposed to mean logical shift if done on an
- unsigned type, arithmetic shift on a signed type.
+ Shift means logical shift if done on an
+ unsigned type, arithmetic shift if done on a signed type.
The second operand is the number of bits to
- shift by, and must always have mode SImode.
- The result has the same mode as the first operand. */
-DEFTREECODE (LSHIFT_EXPR, "alshift_expr", "2", 2)
-DEFTREECODE (RSHIFT_EXPR, "arshift_expr", "2", 2)
-DEFTREECODE (LROTATE_EXPR, "lrotate_expr", "2", 2)
-DEFTREECODE (RROTATE_EXPR, "rrotate_expr", "2", 2)
+ shift by; it need not be the same type as the first operand and result.
+ Note that the result is undefined if the second operand is larger
+ than the first operand's type size. */
+DEFTREECODE (LSHIFT_EXPR, "lshift_expr", '2', 2)
+DEFTREECODE (RSHIFT_EXPR, "rshift_expr", '2', 2)
+DEFTREECODE (LROTATE_EXPR, "lrotate_expr", '2', 2)
+DEFTREECODE (RROTATE_EXPR, "rrotate_expr", '2', 2)
/* Bitwise operations. Operands have same mode as result. */
-DEFTREECODE (BIT_IOR_EXPR, "bit_ior_expr", "2", 2)
-DEFTREECODE (BIT_XOR_EXPR, "bit_xor_expr", "2", 2)
-DEFTREECODE (BIT_AND_EXPR, "bit_and_expr", "2", 2)
-DEFTREECODE (BIT_ANDTC_EXPR, "bit_andtc_expr", "2", 2)
-DEFTREECODE (BIT_NOT_EXPR, "bit_not_expr", "1", 1)
-
-/* Combination of boolean values or of integers considered only
- as zero or nonzero. ANDIF and ORIF allow the second operand
- not to be computed if the value of the expression is determined
- from the first operand. AND, OR, and XOR always compute the second
- operand whether its value is needed or not (for side effects). */
-DEFTREECODE (TRUTH_ANDIF_EXPR, "truth_andif_expr", "e", 2)
-DEFTREECODE (TRUTH_ORIF_EXPR, "truth_orif_expr", "e", 2)
-DEFTREECODE (TRUTH_AND_EXPR, "truth_and_expr", "2", 2)
-DEFTREECODE (TRUTH_OR_EXPR, "truth_or_expr", "2", 2)
-DEFTREECODE (TRUTH_XOR_EXPR, "truth_xor_expr", "2", 2)
-DEFTREECODE (TRUTH_NOT_EXPR, "truth_not_expr", "e", 1)
+DEFTREECODE (BIT_IOR_EXPR, "bit_ior_expr", '2', 2)
+DEFTREECODE (BIT_XOR_EXPR, "bit_xor_expr", '2', 2)
+DEFTREECODE (BIT_AND_EXPR, "bit_and_expr", '2', 2)
+DEFTREECODE (BIT_NOT_EXPR, "bit_not_expr", '1', 1)
+
+/* ANDIF and ORIF allow the second operand not to be computed if the
+ value of the expression is determined from the first operand. AND,
+ OR, and XOR always compute the second operand whether its value is
+ needed or not (for side effects). The operand may have
+ BOOLEAN_TYPE or INTEGER_TYPE. In either case, the argument will be
+ either zero or one. For example, a TRUTH_NOT_EXPR will never have
+ an INTEGER_TYPE VAR_DECL as its argument; instead, a NE_EXPR will be
+ used to compare the VAR_DECL to zero, thereby obtaining a node with
+ value zero or one. */
+DEFTREECODE (TRUTH_ANDIF_EXPR, "truth_andif_expr", 'e', 2)
+DEFTREECODE (TRUTH_ORIF_EXPR, "truth_orif_expr", 'e', 2)
+DEFTREECODE (TRUTH_AND_EXPR, "truth_and_expr", 'e', 2)
+DEFTREECODE (TRUTH_OR_EXPR, "truth_or_expr", 'e', 2)
+DEFTREECODE (TRUTH_XOR_EXPR, "truth_xor_expr", 'e', 2)
+DEFTREECODE (TRUTH_NOT_EXPR, "truth_not_expr", 'e', 1)
/* Relational operators.
`EQ_EXPR' and `NE_EXPR' are allowed for any types.
or real types.
In all cases the operands will have the same type,
and the value is always the type used by the language for booleans. */
-DEFTREECODE (LT_EXPR, "lt_expr", "<", 2)
-DEFTREECODE (LE_EXPR, "le_expr", "<", 2)
-DEFTREECODE (GT_EXPR, "gt_expr", "<", 2)
-DEFTREECODE (GE_EXPR, "ge_expr", "<", 2)
-DEFTREECODE (EQ_EXPR, "eq_expr", "<", 2)
-DEFTREECODE (NE_EXPR, "ne_expr", "<", 2)
+DEFTREECODE (LT_EXPR, "lt_expr", '<', 2)
+DEFTREECODE (LE_EXPR, "le_expr", '<', 2)
+DEFTREECODE (GT_EXPR, "gt_expr", '<', 2)
+DEFTREECODE (GE_EXPR, "ge_expr", '<', 2)
+DEFTREECODE (EQ_EXPR, "eq_expr", '<', 2)
+DEFTREECODE (NE_EXPR, "ne_expr", '<', 2)
+
+/* Additional relational operators for floating point unordered. */
+DEFTREECODE (UNORDERED_EXPR, "unordered_expr", '<', 2)
+DEFTREECODE (ORDERED_EXPR, "ordered_expr", '<', 2)
+
+/* These are equivalent to unordered or ... */
+DEFTREECODE (UNLT_EXPR, "unlt_expr", '<', 2)
+DEFTREECODE (UNLE_EXPR, "unle_expr", '<', 2)
+DEFTREECODE (UNGT_EXPR, "ungt_expr", '<', 2)
+DEFTREECODE (UNGE_EXPR, "unge_expr", '<', 2)
+DEFTREECODE (UNEQ_EXPR, "uneq_expr", '<', 2)
/* Operations for Pascal sets. Not used now. */
-DEFTREECODE (IN_EXPR, "in_expr", "2", 2)
-DEFTREECODE (SET_LE_EXPR, "set_le_expr", "<", 2)
-DEFTREECODE (CARD_EXPR, "card_expr", "1", 1)
-DEFTREECODE (RANGE_EXPR, "range_expr", "2", 2)
+DEFTREECODE (IN_EXPR, "in_expr", '2', 2)
+DEFTREECODE (SET_LE_EXPR, "set_le_expr", '<', 2)
+DEFTREECODE (CARD_EXPR, "card_expr", '1', 1)
+DEFTREECODE (RANGE_EXPR, "range_expr", '2', 2)
/* Represents a conversion of type of a value.
All conversions, including implicit ones, must be
- represented by CONVERT_EXPR nodes. */
-DEFTREECODE (CONVERT_EXPR, "convert_expr", "1", 1)
+ represented by CONVERT_EXPR or NOP_EXPR nodes. */
+DEFTREECODE (CONVERT_EXPR, "convert_expr", '1', 1)
/* Represents a conversion expected to require no code to be generated. */
-DEFTREECODE (NOP_EXPR, "nop_expr", "1", 1)
+DEFTREECODE (NOP_EXPR, "nop_expr", '1', 1)
/* Value is same as argument, but guaranteed not an lvalue. */
-DEFTREECODE (NON_LVALUE_EXPR, "non_lvalue_expr", "1", 1)
+DEFTREECODE (NON_LVALUE_EXPR, "non_lvalue_expr", '1', 1)
+
+/* Represents viewing something of one type as being of a second type.
+ This corresponds to an "Unchecked Conversion" in Ada and roughly to
+ the idiom *(type2 *)&X in C. The only operand is the value to be
+ viewed as being of another type. It is undefined if the type of the
+ input and of the expression have different sizes.
+
+ This code may also be used within the LHS of a MODIFY_EXPR, in which
+ case no actual data motion may occur. TREE_ADDRESSABLE will be set in
+ this case and GCC must abort if it could not do the operation without
+ generating insns. */
+DEFTREECODE (VIEW_CONVERT_EXPR, "view_convert_expr", '1', 1)
/* Represents something we computed once and will use multiple times.
First operand is that expression. Second is the function decl
in which the SAVE_EXPR was created. The third operand is the RTL,
nonzero only after the expression has been computed. */
-DEFTREECODE (SAVE_EXPR, "save_expr", "e", 3)
-
-/* Represents something whose RTL has already been expanded
- as a sequence which should be emitted when this expression is expanded.
- The first operand is the RTL to emit. It is the first of a chain of insns.
- The second is the RTL expression for the result. */
-DEFTREECODE (RTL_EXPR, "rtl_expr", "e", 2)
+DEFTREECODE (SAVE_EXPR, "save_expr", 'e', 3)
+
+/* For a UNSAVE_EXPR, operand 0 is the value to unsave. By unsave, we
+ mean that all _EXPRs such as TARGET_EXPRs, SAVE_EXPRs,
+ CALL_EXPRs and RTL_EXPRs, that are protected
+ from being evaluated more than once should be reset so that a new
+ expand_expr call of this expr will cause those to be re-evaluated.
+ This is useful when we want to reuse a tree in different places,
+ but where we must re-expand. */
+DEFTREECODE (UNSAVE_EXPR, "unsave_expr", 'e', 1)
+
+/* Represents something whose RTL has already been expanded as a
+ sequence which should be emitted when this expression is expanded.
+ The first operand is the RTL to emit. It is the first of a chain
+ of insns. The second is the RTL expression for the result. The
+ third operand is the "alternate RTL expression" for the result, if
+ any; if the second argument is the DECL_RTL for a VAR_DECL, but
+ with an invalid memory address replaced by a valid one, then the
+ third operand will be the original DECL_RTL. Any temporaries
+ created during the building of the RTL_EXPR can be reused once the
+ RTL_EXPR has been expanded, with the exception of the
+ RTL_EXPR_RTL. */
+DEFTREECODE (RTL_EXPR, "rtl_expr", 'e', 3)
/* & in C. Value is the address at which the operand's value resides.
Operand may have any mode. Result mode is Pmode. */
-DEFTREECODE (ADDR_EXPR, "addr_expr", "e", 1)
+DEFTREECODE (ADDR_EXPR, "addr_expr", 'e', 1)
/* Non-lvalue reference or pointer to an object. */
-DEFTREECODE (REFERENCE_EXPR, "reference_expr", "e", 1)
+DEFTREECODE (REFERENCE_EXPR, "reference_expr", 'e', 1)
/* Operand is a function constant; result is a function variable value
- of typeEPmode. Used only for languages that need static chains. */
-DEFTREECODE (ENTRY_VALUE_EXPR, "entry_value_expr", "e", 1)
+ of type EPmode. Used only for languages that need static chains. */
+DEFTREECODE (ENTRY_VALUE_EXPR, "entry_value_expr", 'e', 1)
+
+/* Operand0 is a function constant; result is part N of a function
+ descriptor of type ptr_mode. */
+DEFTREECODE (FDESC_EXPR, "fdesc_expr", 'e', 2)
/* Given two real or integer operands of the same type,
returns a complex value of the corresponding complex type. */
-DEFTREECODE (COMPLEX_EXPR, "complex_expr", "2", 2)
+DEFTREECODE (COMPLEX_EXPR, "complex_expr", '2', 2)
-/* Complex conjugate of operand. Used only on complex types.
- The value has the same type as the operand. */
-DEFTREECODE (CONJ_EXPR, "conj_expr", "1", 1)
+/* Complex conjugate of operand. Used only on complex types. */
+DEFTREECODE (CONJ_EXPR, "conj_expr", '1', 1)
/* Used only on an operand of complex type, these return
a value of the corresponding component type. */
-DEFTREECODE (REALPART_EXPR, "realpart_expr", "1", 1)
-DEFTREECODE (IMAGPART_EXPR, "imagpart_expr", "1", 1)
+DEFTREECODE (REALPART_EXPR, "realpart_expr", '1', 1)
+DEFTREECODE (IMAGPART_EXPR, "imagpart_expr", '1', 1)
/* Nodes for ++ and -- in C.
The second arg is how much to increment or decrement by.
For a pointer, it would be the size of the object pointed to. */
-DEFTREECODE (PREDECREMENT_EXPR, "predecrement_expr", "e", 2)
-DEFTREECODE (PREINCREMENT_EXPR, "preincrement_expr", "e", 2)
-DEFTREECODE (POSTDECREMENT_EXPR, "postdecrement_expr", "e", 2)
-DEFTREECODE (POSTINCREMENT_EXPR, "postincrement_expr", "e", 2)
+DEFTREECODE (PREDECREMENT_EXPR, "predecrement_expr", 'e', 2)
+DEFTREECODE (PREINCREMENT_EXPR, "preincrement_expr", 'e', 2)
+DEFTREECODE (POSTDECREMENT_EXPR, "postdecrement_expr", 'e', 2)
+DEFTREECODE (POSTINCREMENT_EXPR, "postincrement_expr", 'e', 2)
+
+/* Used to implement `va_arg'. */
+DEFTREECODE (VA_ARG_EXPR, "va_arg_expr", 'e', 1)
+
+/* Evaluate operand 1. If and only if an exception is thrown during
+ the evaluation of operand 1, evaluate operand 2.
+
+ This differs from WITH_CLEANUP_EXPR, in that operand 2 is never
+ evaluated unless an exception is throw. */
+DEFTREECODE (TRY_CATCH_EXPR, "try_catch_expr", 'e', 2)
+
+/* Evaluate the first operand.
+ The second operand is a cleanup expression which is evaluated
+ on any exit (normal, exception, or jump out) from this expression. */
+DEFTREECODE (TRY_FINALLY_EXPR, "try_finally", 'e', 2)
+
+/* Used internally for cleanups in the implementation of TRY_FINALLY_EXPR.
+ (Specifically, it is created by expand_expr, not front-ends.)
+ Operand 0 is the rtx for the start of the subroutine we need to call.
+ Operand 1 is the rtx for a variable in which to store the address
+ of where the subroutine should return to. */
+DEFTREECODE (GOTO_SUBROUTINE_EXPR, "goto_subroutine", 'e', 2)
\f
/* These types of expressions have no useful value,
and always have side effects. */
/* A label definition, encapsulated as a statement.
Operand 0 is the LABEL_DECL node for the label that appears here.
The type should be void and the value should be ignored. */
-DEFTREECODE (LABEL_EXPR, "label_expr", "s", 1)
+DEFTREECODE (LABEL_EXPR, "label_expr", 's', 1)
-/* GOTO. Operand 0 is a LABEL_DECL node.
+/* GOTO. Operand 0 is a LABEL_DECL node or an expression.
The type should be void and the value should be ignored. */
-DEFTREECODE (GOTO_EXPR, "goto_expr", "s", 1)
+DEFTREECODE (GOTO_EXPR, "goto_expr", 's', 1)
/* RETURN. Evaluates operand 0, then returns from the current function.
Presumably that operand is an assignment that stores into the
RESULT_DECL that hold the value to be returned.
The operand may be null.
The type should be void and the value should be ignored. */
-DEFTREECODE (RETURN_EXPR, "return_expr", "s", 1)
+DEFTREECODE (RETURN_EXPR, "return_expr", 's', 1)
/* Exit the inner most loop conditionally. Operand 0 is the condition.
The type should be void and the value should be ignored. */
-DEFTREECODE (EXIT_EXPR, "exit_expr", "s", 1)
+DEFTREECODE (EXIT_EXPR, "exit_expr", 's', 1)
/* A loop. Operand 0 is the body of the loop.
It must contain an EXIT_EXPR or is an infinite loop.
The type should be void and the value should be ignored. */
-DEFTREECODE (LOOP_EXPR, "loop_expr", "s", 1)
+DEFTREECODE (LOOP_EXPR, "loop_expr", 's', 1)
+
+/* A labeled block. Operand 0 is the label that will be generated to
+ mark the end of the block.
+ Operand 1 is the labeled block body. */
+DEFTREECODE (LABELED_BLOCK_EXPR, "labeled_block_expr", 'e', 2)
+
+/* Exit a labeled block, possibly returning a value. Operand 0 is a
+ LABELED_BLOCK_EXPR to exit. Operand 1 is the value to return. It
+ may be left null. */
+DEFTREECODE (EXIT_BLOCK_EXPR, "exit_block_expr", 'e', 2)
+
+/* Annotates a tree node (usually an expression) with source location
+ information: a file name (EXPR_WFL_FILENAME); a line number
+ (EXPR_WFL_LINENO); and column number (EXPR_WFL_COLNO). It is
+ expanded as the contained node (EXPR_WFL_NODE); a line note should
+ be emitted first if EXPR_WFL_EMIT_LINE_NOTE.
+ The third operand is only used in the Java front-end, and will
+ eventually be removed. */
+DEFTREECODE (EXPR_WITH_FILE_LOCATION, "expr_with_file_location", 'e', 3)
+
+/* Switch expression.
+ Operand 0 is the expression used to perform the branch,
+ Operand 1 contains the case values. The way they're organized is
+ front-end implementation defined. */
+DEFTREECODE (SWITCH_EXPR, "switch_expr", 'e', 2)
+
+/* The exception object from the runtime. */
+DEFTREECODE (EXC_PTR_EXPR, "exc_ptr_expr", 'e', 0)
/*
Local variables:
mode:c
-version-control: t
End:
*/
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