mirrored from git://gcc.gnu.org/git/gcc.git
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tree.def
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tree.def
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/* This file contains the definitions and documentation for the
tree codes used in GCC.
Copyright (C) 1987-2024 Free Software Foundation, Inc.
This file is part of GCC.
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 3, or (at your option) any later
version.
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 GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
/* For tcc_references, tcc_expression, tcc_comparison, tcc_unary,
tcc_binary, and tcc_statement 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 tcc_exceptional or tcc_constant codes must
define the tree_size langhook to say how big they are.
These tree codes have been sorted so that the macros in tree.h that
check for various tree codes are optimized into range checks. This
gives a measurable performance improvement. When adding a new
code, consider its placement in relation to the other codes. */
/* 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", tcc_exceptional, 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", tcc_exceptional, 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", tcc_exceptional, 0)
/* These nodes contain an array of tree nodes. */
DEFTREECODE (TREE_VEC, "tree_vec", tcc_exceptional, 0)
/* A symbol binding block. These are arranged in a tree,
where the BLOCK_SUBBLOCKS field contains a chain of subblocks
chained through the BLOCK_CHAIN field.
BLOCK_SUPERCONTEXT points to the parent block.
For a block which represents the outermost scope of a function, it
points to the FUNCTION_DECL node.
BLOCK_VARS points to a chain of decl nodes.
BLOCK_CHAIN points to the next BLOCK at the same level.
BLOCK_ABSTRACT_ORIGIN points to the original (abstract) tree node which
this block is an instance of, or else is NULL to indicate that this
block is not an instance of anything else. When non-NULL, the value
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).
TREE_ASM_WRITTEN is nonzero if the block was actually referenced
in the generated assembly. */
DEFTREECODE (BLOCK, "block", tcc_exceptional, 0)
/* Each data type is represented by a tree node whose code is one of
the following: */
/* Each node that represents a data type has a component TYPE_SIZE
that evaluates either to a tree that is a (potentially non-constant)
expression representing the type size in bits, or to a null pointer
when the size of the type is unknown (for example, for incomplete
types such as arrays of unspecified bound).
The TYPE_MODE contains the machine mode for values of this type.
The TYPE_POINTER_TO field contains a type for a pointer to this type,
or zero if no such has been created yet.
The TYPE_NEXT_VARIANT field is used to chain together types
that are variants made by type modifiers such as "const" and "volatile".
The TYPE_MAIN_VARIANT field, in any member of such a chain,
points to the start of the chain.
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
in the case of structs, unions or enums that are known with a tag,
or zero for types that have no special name.
The TYPE_CONTEXT for any sort of type which could have a name or
which could have named members (e.g. tagged types in C/C++) will
point to the node which represents the scope of the given type, or
will be NULL_TREE if the type has "file scope". For most types, this
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, 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.
The TYPE_STUB_DECL field is used as a forward-references to names for
ENUMERAL_TYPE, RECORD_TYPE, UNION_TYPE, and QUAL_UNION_TYPE nodes;
see below. */
/* The ordering of the following codes is optimized for the checking
macros in tree.h. Changing the order will degrade the speed of the
compiler. OFFSET_TYPE, ENUMERAL_TYPE, BOOLEAN_TYPE, INTEGER_TYPE,
BITINT_TYPE, REAL_TYPE, POINTER_TYPE. */
/* 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", tcc_type, 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
CONST_DECL nodes, but the type does not point to them;
however, the TYPE_VALUES is a list in which each element's TREE_PURPOSE
is a name and the TREE_VALUE is the value (an INTEGER_CST node). */
/* A forward reference `enum foo' when no enum named foo is defined yet
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, UNION_TYPE, and QUAL_UNION_TYPE forward refs are
treated similarly. */
DEFTREECODE (ENUMERAL_TYPE, "enumeral_type", tcc_type, 0)
/* Boolean type (true or false are the only values). Looks like an
INTEGRAL_TYPE. */
DEFTREECODE (BOOLEAN_TYPE, "boolean_type", tcc_type, 0)
/* 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). */
DEFTREECODE (INTEGER_TYPE, "integer_type", tcc_type, 0)
/* Bit-precise integer type. These are similar to INTEGER_TYPEs, but
can have arbitrary user selected precisions and do or can have different
alignment, function argument and return value passing conventions.
Larger BITINT_TYPEs can have BLKmode TYPE_MODE and need to be lowered
by a special BITINT_TYPE lowering pass. */
DEFTREECODE (BITINT_TYPE, "bitint_type", tcc_type, 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", tcc_type, 0)
/* The ordering of the following codes is optimized for the checking
macros in tree.h. Changing the order will degrade the speed of the
compiler. POINTER_TYPE, REFERENCE_TYPE. Note that this range
overlaps the previous range of ordered types. */
/* 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", tcc_type, 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", tcc_type, 0)
/* The C++ decltype(nullptr) type. */
DEFTREECODE (NULLPTR_TYPE, "nullptr_type", tcc_type, 0)
/* _Fract and _Accum types in Embedded-C. Different fixed-point types
are distinguished by machine mode and by the TYPE_SIZE and the
TYPE_PRECISION. */
DEFTREECODE (FIXED_POINT_TYPE, "fixed_point_type", tcc_type, 0)
/* The ordering of the following codes is optimized for the checking
macros in tree.h. Changing the order will degrade the speed of the
compiler. COMPLEX_TYPE, VECTOR_TYPE, ARRAY_TYPE. */
/* Complex number types. The TREE_TYPE field is the data type
of the real and imaginary parts. It must be of scalar
arithmetic type, not including pointer type. */
DEFTREECODE (COMPLEX_TYPE, "complex_type", tcc_type, 0)
/* Vector types. The TREE_TYPE field is the data type of the vector
elements. The TYPE_PRECISION field is the number of subparts of
the vector. */
DEFTREECODE (VECTOR_TYPE, "vector_type", tcc_type, 0)
/* The ordering of the following codes is optimized for the checking
macros in tree.h. Changing the order will degrade the speed of the
compiler. ARRAY_TYPE, RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE.
Note that this range overlaps the previous range. */
/* 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.
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.
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 */
DEFTREECODE (ARRAY_TYPE, "array_type", tcc_type, 0)
/* Struct in C. */
/* Special fields:
TYPE_FIELDS chain of FIELD_DECLs for the fields of the struct,
VAR_DECLs, TYPE_DECLs and CONST_DECLs for record-scope variables,
types and enumerators and FUNCTION_DECLs for methods associated
with the type. */
/* See the comment above, before ENUMERAL_TYPE, for how
forward references to struct tags are handled in C. */
DEFTREECODE (RECORD_TYPE, "record_type", tcc_type, 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", tcc_type, 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", tcc_type, 0)
/* The ordering of the following codes is optimized for the checking
macros in tree.h. Changing the order will degrade the speed of the
compiler. VOID_TYPE, FUNCTION_TYPE, METHOD_TYPE. */
/* The void type in C */
DEFTREECODE (VOID_TYPE, "void_type", tcc_type, 0)
/* Type of functions. Special fields:
TREE_TYPE type of value returned.
TYPE_ARG_TYPES list of types of arguments expected.
this list is made of TREE_LIST nodes.
In this list TREE_PURPOSE can be used to indicate the default
value of parameter (used by C++ frontend).
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", tcc_type, 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", tcc_type, 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", tcc_type, 0)
/* This is for types that will use MODE_OPAQUE in the back end. They are meant
to be able to go in a register of some sort but are explicitly not to be
converted or operated on like INTEGER_TYPE. They will have size and
alignment information only. */
DEFTREECODE (OPAQUE_TYPE, "opaque_type", tcc_type, 0)
/* Expressions */
/* First, the constants. */
DEFTREECODE (VOID_CST, "void_cst", tcc_constant, 0)
/* Contents are in an array of HOST_WIDE_INTs.
We often access these constants both in their native precision and
in wider precisions (with the constant being implicitly extended
according to TYPE_SIGN). In each case, the useful part of the array
may be as wide as the precision requires but may be shorter when all
of the upper bits are sign bits. The length of the array when accessed
in the constant's native precision is given by TREE_INT_CST_NUNITS.
The length of the array when accessed in wider precisions is given
by TREE_INT_CST_EXT_NUNITS. Each element can be obtained using
TREE_INT_CST_ELT.
INTEGER_CST nodes can be shared, and therefore should be considered
read only. They should be copied before setting a flag such as
TREE_OVERFLOW. If an INTEGER_CST has TREE_OVERFLOW already set,
it is known to be unique. INTEGER_CST nodes are created for the
integral types, for pointer types and for vector and float types in
some circumstances. */
DEFTREECODE (INTEGER_CST, "integer_cst", tcc_constant, 0)
/* Contents are given by POLY_INT_CST_COEFF. */
DEFTREECODE (POLY_INT_CST, "poly_int_cst", tcc_constant, 0)
/* Contents are in TREE_REAL_CST field. */
DEFTREECODE (REAL_CST, "real_cst", tcc_constant, 0)
/* Contents are in TREE_FIXED_CST field. */
DEFTREECODE (FIXED_CST, "fixed_cst", tcc_constant, 0)
/* Contents are in TREE_REALPART and TREE_IMAGPART fields,
whose contents are other constant nodes. */
DEFTREECODE (COMPLEX_CST, "complex_cst", tcc_constant, 0)
/* See generic.texi for details. */
DEFTREECODE (VECTOR_CST, "vector_cst", tcc_constant, 0)
/* Contents are TREE_STRING_LENGTH and the actual contents of the string. */
DEFTREECODE (STRING_CST, "string_cst", tcc_constant, 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.
The TREE_TYPE field holds the data type of the object, when relevant.
LABEL_DECLs have no data type. For TYPE_DECL, the TREE_TYPE field
contents are the type whose name is being declared.
The DECL_ALIGN, DECL_SIZE,
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_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,
or the value of a constant. For a function, it holds the body
(a node of type BLOCK representing the function's binding contour
and whose body contains the function's statements.) For a LABEL_DECL
in C, it is a flag, nonzero if the label's definition has been seen.
PARM_DECLs use a special field:
DECL_ARG_TYPE is the type in which the argument is actually
passed, which may be different from its type within the function.
FUNCTION_DECLs use four special fields:
DECL_ARGUMENTS holds a chain of PARM_DECL nodes for the arguments.
DECL_RESULT holds a RESULT_DECL node for the value of a function.
The DECL_RTL field is 0 for a function that returns no value.
(C functions returning void have zero here.)
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.
DECL_SOURCE_FILE holds a filename string and DECL_SOURCE_LINE
holds a line number. In some cases these can be the location of
a reference, if no definition has been seen.
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", tcc_declaration, 0)
DEFTREECODE (LABEL_DECL, "label_decl", tcc_declaration, 0)
/* The ordering of the following codes is optimized for the checking
macros in tree.h. Changing the order will degrade the speed of the
compiler. FIELD_DECL, VAR_DECL, CONST_DECL, PARM_DECL,
TYPE_DECL. */
DEFTREECODE (FIELD_DECL, "field_decl", tcc_declaration, 0)
DEFTREECODE (VAR_DECL, "var_decl", tcc_declaration, 0)
DEFTREECODE (CONST_DECL, "const_decl", tcc_declaration, 0)
DEFTREECODE (PARM_DECL, "parm_decl", tcc_declaration, 0)
DEFTREECODE (TYPE_DECL, "type_decl", tcc_declaration, 0)
DEFTREECODE (RESULT_DECL, "result_decl", tcc_declaration, 0)
/* A "declaration" of a debug temporary. It should only appear in
DEBUG stmts. */
DEFTREECODE (DEBUG_EXPR_DECL, "debug_expr_decl", tcc_declaration, 0)
/* A stmt that marks the beginning of a source statement. */
DEFTREECODE (DEBUG_BEGIN_STMT, "debug_begin_stmt", tcc_statement, 0)
/* A namespace declaration. Namespaces appear in DECL_CONTEXT of other
_DECLs, providing a hierarchy of names. */
DEFTREECODE (NAMESPACE_DECL, "namespace_decl", tcc_declaration, 0)
/* A declaration import.
The C++ FE uses this to represent a using-directive; eg:
"using namespace foo".
But it could be used to represent any declaration import construct.
Whenever a declaration import appears in a lexical block, the BLOCK node
representing that lexical block in GIMPLE will contain an IMPORTED_DECL
node, linked via BLOCK_VARS accessor of the said BLOCK.
For a given NODE which code is IMPORTED_DECL,
IMPORTED_DECL_ASSOCIATED_DECL (NODE) accesses the imported declaration. */
DEFTREECODE (IMPORTED_DECL, "imported_decl", tcc_declaration, 0)
/* A namelist declaration.
The Fortran FE uses this to represent a namelist statement, e.g.:
NAMELIST /namelist-group-name/ namelist-group-object-list.
Whenever a declaration import appears in a lexical block, the BLOCK node
representing that lexical block in GIMPLE will contain an NAMELIST_DECL
node, linked via BLOCK_VARS accessor of the said BLOCK.
For a given NODE which code is NAMELIST_DECL,
NAMELIST_DECL_ASSOCIATED_DECL (NODE) accesses the imported declaration. */
DEFTREECODE (NAMELIST_DECL, "namelist_decl", tcc_declaration, 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",\
tcc_declaration, 0)
/* References to storage. */
/* The ordering of the following codes is optimized for the classification
in handled_component_p. Keep them in a consecutive group. */
/* 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).
Operand 2, if present, is the value of DECL_FIELD_OFFSET, measured
in units of DECL_OFFSET_ALIGN / BITS_PER_UNIT. */
DEFTREECODE (COMPONENT_REF, "component_ref", tcc_reference, 3)
/* 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 0 is the structure or union expression;
operand 1 is a tree giving the constant number of bits being referenced;
operand 2 is a tree giving the constant position of the first referenced bit.
The result type width has to match the number of bits referenced.
If the result type is integral, its signedness specifies how it is extended
to its mode width. */
DEFTREECODE (BIT_FIELD_REF, "bit_field_ref", tcc_reference, 3)
/* Array indexing.
Operand 0 is the array; operand 1 is a (single) array index.
Operand 2, if present, is a copy of TYPE_MIN_VALUE of the index.
Operand 3, if present, is the element size, measured in units of
the alignment of the element type. */
DEFTREECODE (ARRAY_REF, "array_ref", tcc_reference, 4)
/* 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", tcc_reference, 4)
/* Used only on an operand of complex type, these return
a value of the corresponding component type. */
DEFTREECODE (REALPART_EXPR, "realpart_expr", tcc_reference, 1)
DEFTREECODE (IMAGPART_EXPR, "imagpart_expr", tcc_reference, 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", tcc_reference, 1)
/* C unary `*'. One operand, an expression for a pointer. */
DEFTREECODE (INDIRECT_REF, "indirect_ref", tcc_reference, 1)
/* Used to represent lookup in a virtual method table which is dependent on
the runtime type of an object. Operands are:
OBJ_TYPE_REF_EXPR: An expression that evaluates the value to use.
OBJ_TYPE_REF_OBJECT: Is the object on whose behalf the lookup is
being performed. Through this the optimizers may be able to statically
determine the dynamic type of the object.
OBJ_TYPE_REF_TOKEN: An integer index to the virtual method table.
The integer index should have as type the original type of
OBJ_TYPE_REF_OBJECT; as pointer type conversions are useless in GIMPLE,
the type of OBJ_TYPE_REF_OBJECT can change to an unrelated pointer
type during optimizations. */
DEFTREECODE (OBJ_TYPE_REF, "obj_type_ref", tcc_expression, 3)
/* Used to represent the brace-enclosed initializers for a structure or an
array. It contains a sequence of component values made out of a VEC of
constructor_elt.
For RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE:
The field INDEX of each constructor_elt is a FIELD_DECL.
For ARRAY_TYPE:
The field INDEX of each constructor_elt is the corresponding index.
If the index is a RANGE_EXPR, it is a short-hand for many nodes,
one for each index in the range. (If the corresponding field 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.)
Components that aren't present are cleared as per the C semantics,
unless the CONSTRUCTOR_NO_CLEARING flag is set, in which case their
value becomes undefined. */
DEFTREECODE (CONSTRUCTOR, "constructor", tcc_exceptional, 0)
/* 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. The
type of the first expression need not agree with the other types. */
DEFTREECODE (COMPOUND_EXPR, "compound_expr", tcc_expression, 2)
/* Assignment expression. Operand 0 is the what to set; 1, the new value. */
DEFTREECODE (MODIFY_EXPR, "modify_expr", tcc_expression, 2)
/* Initialization expression. Operand 0 is the variable to initialize;
Operand 1 is the initializer. This differs from MODIFY_EXPR in that any
reference to the referent of operand 0 within operand 1 is undefined. */
DEFTREECODE (INIT_EXPR, "init_expr", tcc_expression, 2)
/* For TARGET_EXPR, operand 0 is the target of an initialization,
operand 1 is the initializer for the target, which may be void
if simply expanding it initializes the target.
operand 2 is the cleanup for this node, if any.
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", tcc_expression, 4)
/* Conditional expression ( ... ? ... : ... in C).
Operand 0 is the condition.
Operand 1 is the then-value.
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. The
condition in operand 0 must be of integral type.
In cfg gimple, if you do not have a selection expression, operands
1 and 2 are NULL. The operands are then taken from the cfg edges. */
DEFTREECODE (COND_EXPR, "cond_expr", tcc_expression, 3)
/* Represents a vector in which every element is equal to operand 0. */
DEFTREECODE (VEC_DUPLICATE_EXPR, "vec_duplicate_expr", tcc_unary, 1)
/* Vector series created from a start (base) value and a step.
A = VEC_SERIES_EXPR (B, C)
means
for (i = 0; i < N; i++)
A[i] = B + C * i; */
DEFTREECODE (VEC_SERIES_EXPR, "vec_series_expr", tcc_binary, 2)
/* Vector conditional expression. It is like COND_EXPR, but with
vector operands.
A = VEC_COND_EXPR ( X < Y, B, C)
means
for (i=0; i<N; i++)
A[i] = X[i] < Y[i] ? B[i] : C[i];
*/
DEFTREECODE (VEC_COND_EXPR, "vec_cond_expr", tcc_expression, 3)
/* Vector permutation expression. A = VEC_PERM_EXPR<v0, v1, mask> means
N = length(mask)
foreach i in N:
M = mask[i] % (length(v0) + length(v1))
A[i] = M < length(v0) ? v0[M] : v1[M - length(v0)]
V0 and V1 are vectors of the same type.
When MASK is not constant:
MASK is an integer-typed vector. The number of MASK elements must
be the same as the number of elements in V0 and V1. The size of
the inner type of the MASK and of the V0 and V1 must be the same.
When MASK is constant:
MASK is an integer-typed vector.
*/
DEFTREECODE (VEC_PERM_EXPR, "vec_perm_expr", tcc_expression, 3)
/* Declare local variables, including making RTL and allocating space.
BIND_EXPR_VARS is a chain of VAR_DECL nodes for the variables.
BIND_EXPR_BODY is the body, the expression to be computed using
the variables. The value of operand 1 becomes that of the BIND_EXPR.
BIND_EXPR_BLOCK is the BLOCK that corresponds to these bindings
for debugging purposes. If this BIND_EXPR is actually expanded,
that sets the TREE_USED flag in the BLOCK.
The BIND_EXPR is not responsible for informing parsers
about these variables. If the body is coming from the input file,
then the code that creates the BIND_EXPR is also responsible for
informing the parser of the variables.
If the BIND_EXPR is ever expanded, its TREE_USED flag is set.
This tells the code for debugging symbol tables not to ignore the BIND_EXPR.
If the BIND_EXPR should be output for debugging but will not be expanded,
set the TREE_USED flag by hand.
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", tcc_expression, 3)
/* Function call. CALL_EXPRs are represented by variably-sized expression
nodes. There are at least three fixed operands. Operand 0 is an
INTEGER_CST node containing the total operand count, the number of
arguments plus 3. Operand 1 is the function or NULL, while operand 2 is
is static chain argument, or NULL. The remaining operands are the
arguments to the call. */
DEFTREECODE (CALL_EXPR, "call_expr", tcc_vl_exp, 3)
/* Specify a value to compute along with its corresponding cleanup.
Operand 0 is the cleanup expression.
The cleanup is executed by the first enclosing CLEANUP_POINT_EXPR,
which must exist. This differs from TRY_CATCH_EXPR in that operand 1
is always evaluated when cleanups are run. */
DEFTREECODE (WITH_CLEANUP_EXPR, "with_cleanup_expr", tcc_expression, 1)
/* 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", tcc_expression, 1)
/* The following code is 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 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 call substitute_placeholder_in_expr
passing both that tree 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. */
/* Denotes a record to later be substituted before evaluating this expression.
The type of this expression is used to find the record to replace it. */
DEFTREECODE (PLACEHOLDER_EXPR, "placeholder_expr", tcc_exceptional, 0)
/* Simple arithmetic. */
DEFTREECODE (PLUS_EXPR, "plus_expr", tcc_binary, 2)
DEFTREECODE (MINUS_EXPR, "minus_expr", tcc_binary, 2)
DEFTREECODE (MULT_EXPR, "mult_expr", tcc_binary, 2)
/* Pointer addition. The first operand is always a pointer and the
second operand is an integer of type sizetype. */
DEFTREECODE (POINTER_PLUS_EXPR, "pointer_plus_expr", tcc_binary, 2)
/* Pointer subtraction. The two arguments are pointers, and the result
is a signed integer of the same precision. Pointers are interpreted
as unsigned, the difference is computed as if in infinite signed
precision. Behavior is undefined if the difference does not fit in
the result type. The result does not depend on the pointer type,
it is not divided by the size of the pointed-to type. */
DEFTREECODE (POINTER_DIFF_EXPR, "pointer_diff_expr", tcc_binary, 2)
/* Highpart multiplication. For an integral type with precision B,
returns bits [2B-1, B] of the full 2*B product. Both operands
and the result should have integer types of the same precision
and signedness. */
DEFTREECODE (MULT_HIGHPART_EXPR, "mult_highpart_expr", tcc_binary, 2)
/* Division for integer result that rounds the quotient toward zero. */
DEFTREECODE (TRUNC_DIV_EXPR, "trunc_div_expr", tcc_binary, 2)
/* Division for integer result that rounds it toward plus infinity. */
DEFTREECODE (CEIL_DIV_EXPR, "ceil_div_expr", tcc_binary, 2)
/* Division for integer result that rounds it toward minus infinity. */
DEFTREECODE (FLOOR_DIV_EXPR, "floor_div_expr", tcc_binary, 2)
/* Division for integer result that rounds it toward nearest integer. */
DEFTREECODE (ROUND_DIV_EXPR, "round_div_expr", tcc_binary, 2)
/* Four kinds of remainder that go with the four kinds of division: */
/* The sign of the remainder is that of the dividend. */
DEFTREECODE (TRUNC_MOD_EXPR, "trunc_mod_expr", tcc_binary, 2)
/* The sign of the remainder is the opposite of that of the divisor. */
DEFTREECODE (CEIL_MOD_EXPR, "ceil_mod_expr", tcc_binary, 2)
/* The sign of the remainder is that of the divisor. */
DEFTREECODE (FLOOR_MOD_EXPR, "floor_mod_expr", tcc_binary, 2)
/* The sign of the remainder is not predictable. */
DEFTREECODE (ROUND_MOD_EXPR, "round_mod_expr", tcc_binary, 2)
/* Division for real result. */
DEFTREECODE (RDIV_EXPR, "rdiv_expr", tcc_binary, 2)
/* Division which is not supposed to need rounding.
Used for pointer subtraction in C. */
DEFTREECODE (EXACT_DIV_EXPR, "exact_div_expr", tcc_binary, 2)
/* Conversion of real to fixed point by truncation. */
DEFTREECODE (FIX_TRUNC_EXPR, "fix_trunc_expr", tcc_unary, 1)
/* Conversion of an integer to a real. */
DEFTREECODE (FLOAT_EXPR, "float_expr", tcc_unary, 1)
/* Unary negation. */
DEFTREECODE (NEGATE_EXPR, "negate_expr", tcc_unary, 1)
/* Minimum and maximum values. When used with floating point, if both
operands are zeros, or if either operand is NaN, then it is unspecified
which of the two operands is returned as the result. */
DEFTREECODE (MIN_EXPR, "min_expr", tcc_binary, 2)
DEFTREECODE (MAX_EXPR, "max_expr", tcc_binary, 2)
/* Represents the absolute value of the operand.
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", tcc_unary, 1)
/* Represents the unsigned absolute value of the operand.
An ABSU_EXPR must have unsigned INTEGER_TYPE. The operand of the ABSU_EXPR
must have the corresponding signed type. */
DEFTREECODE (ABSU_EXPR, "absu_expr", tcc_unary, 1)
/* Shift operations for shift and rotate.
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; 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 or equal to the first operand's type size.
The first operand of a shift can have either an integer or a
(non-integer) fixed-point type. We follow the ISO/IEC TR 18037:2004
semantics for the latter.
Rotates are defined for integer types only. */
DEFTREECODE (LSHIFT_EXPR, "lshift_expr", tcc_binary, 2)
DEFTREECODE (RSHIFT_EXPR, "rshift_expr", tcc_binary, 2)
DEFTREECODE (LROTATE_EXPR, "lrotate_expr", tcc_binary, 2)
DEFTREECODE (RROTATE_EXPR, "rrotate_expr", tcc_binary, 2)
/* Bitwise operations. Operands have same mode as result. */
DEFTREECODE (BIT_IOR_EXPR, "bit_ior_expr", tcc_binary, 2)
DEFTREECODE (BIT_XOR_EXPR, "bit_xor_expr", tcc_binary, 2)
DEFTREECODE (BIT_AND_EXPR, "bit_and_expr", tcc_binary, 2)
DEFTREECODE (BIT_NOT_EXPR, "bit_not_expr", tcc_unary, 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", tcc_expression, 2)
DEFTREECODE (TRUTH_ORIF_EXPR, "truth_orif_expr", tcc_expression, 2)
DEFTREECODE (TRUTH_AND_EXPR, "truth_and_expr", tcc_expression, 2)
DEFTREECODE (TRUTH_OR_EXPR, "truth_or_expr", tcc_expression, 2)
DEFTREECODE (TRUTH_XOR_EXPR, "truth_xor_expr", tcc_expression, 2)
DEFTREECODE (TRUTH_NOT_EXPR, "truth_not_expr", tcc_expression, 1)
/* Relational operators.
EQ_EXPR and NE_EXPR are allowed for any types. The others, except for
LTGT_EXPR, are allowed only for integral, floating-point and vector types.
LTGT_EXPR is allowed only for floating-point types.
For floating-point operators, if either operand is a NaN, then NE_EXPR
returns true and the remaining operators return false. The operators
other than EQ_EXPR and NE_EXPR may generate an exception on quiet NaNs.
In all cases the operands will have the same type,
and the value is either the type used by the language for booleans
or an integer vector type of the same size and with the same number
of elements as the comparison operands. True for a vector of
comparison results has all bits set while false is equal to zero. */
DEFTREECODE (LT_EXPR, "lt_expr", tcc_comparison, 2)
DEFTREECODE (LE_EXPR, "le_expr", tcc_comparison, 2)
DEFTREECODE (GT_EXPR, "gt_expr", tcc_comparison, 2)
DEFTREECODE (GE_EXPR, "ge_expr", tcc_comparison, 2)
DEFTREECODE (LTGT_EXPR, "ltgt_expr", tcc_comparison, 2)
DEFTREECODE (EQ_EXPR, "eq_expr", tcc_comparison, 2)
DEFTREECODE (NE_EXPR, "ne_expr", tcc_comparison, 2)
/* Additional relational operators for floating-point unordered. */
DEFTREECODE (UNORDERED_EXPR, "unordered_expr", tcc_comparison, 2)
DEFTREECODE (ORDERED_EXPR, "ordered_expr", tcc_comparison, 2)
/* These are equivalent to unordered or ... */
DEFTREECODE (UNLT_EXPR, "unlt_expr", tcc_comparison, 2)
DEFTREECODE (UNLE_EXPR, "unle_expr", tcc_comparison, 2)
DEFTREECODE (UNGT_EXPR, "ungt_expr", tcc_comparison, 2)
DEFTREECODE (UNGE_EXPR, "unge_expr", tcc_comparison, 2)
DEFTREECODE (UNEQ_EXPR, "uneq_expr", tcc_comparison, 2)
DEFTREECODE (RANGE_EXPR, "range_expr", tcc_binary, 2)
/* Represents a re-association barrier for floating point expressions
like explicit parenthesis in fortran. */
DEFTREECODE (PAREN_EXPR, "paren_expr", tcc_unary, 1)
/* Represents a conversion of type of a value.
All conversions, including implicit ones, must be
represented by CONVERT_EXPR or NOP_EXPR nodes. */
DEFTREECODE (CONVERT_EXPR, "convert_expr", tcc_unary, 1)
/* Conversion of a pointer value to a pointer to a different
address space. */
DEFTREECODE (ADDR_SPACE_CONVERT_EXPR, "addr_space_convert_expr", tcc_unary, 1)
/* Conversion of a fixed-point value to an integer, a real, or a fixed-point
value. Or conversion of a fixed-point value from an integer, a real, or
a fixed-point value. */
DEFTREECODE (FIXED_CONVERT_EXPR, "fixed_convert_expr", tcc_unary, 1)
/* Represents a conversion expected to require no code to be generated. */
DEFTREECODE (NOP_EXPR, "nop_expr", tcc_unary, 1)
/* Value is same as argument, but guaranteed not an lvalue. */
DEFTREECODE (NON_LVALUE_EXPR, "non_lvalue_expr", tcc_unary, 1)
/* A COMPOUND_LITERAL_EXPR represents a literal that is placed in a DECL. The
COMPOUND_LITERAL_EXPR_DECL_EXPR is the a DECL_EXPR containing the decl
for the anonymous object represented by the COMPOUND_LITERAL;
the DECL_INITIAL of that decl is the CONSTRUCTOR that initializes
the compound literal. */
DEFTREECODE (COMPOUND_LITERAL_EXPR, "compound_literal_expr", tcc_expression, 1)
/* Represents something we computed once and will use multiple times.
First operand is that expression. After it is evaluated once, it
will be replaced by the temporary variable that holds the value. */
DEFTREECODE (SAVE_EXPR, "save_expr", tcc_expression, 1)
/* & 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", tcc_expression, 1)
/* Operand0 is a function constant; result is part N of a function
descriptor of type ptr_mode. */
DEFTREECODE (FDESC_EXPR, "fdesc_expr", tcc_expression, 2)
/* Given a container value, a replacement value and a bit position within
the container, produce the value that results from replacing the part of
the container starting at the bit position with the replacement value.
Operand 0 is a tree for the container value of integral or vector type;
Operand 1 is a tree for the replacement value of another integral or
the vector element type;
Operand 2 is a tree giving the constant bit position;
The number of bits replaced is given by the precision of the type of the
replacement value if it is integral or by its size if it is non-integral.
??? The reason to make the size of the replacement implicit is to avoid
introducing a quaternary operation.
The replaced bits shall be fully inside the container. If the container
is of vector type, then these bits shall be aligned with its elements. */
DEFTREECODE (BIT_INSERT_EXPR, "bit_insert_expr", tcc_expression, 3)
/* Given two real or integer operands of the same type,
returns a complex value of the corresponding complex type. */
DEFTREECODE (COMPLEX_EXPR, "complex_expr", tcc_binary, 2)
/* Complex conjugate of operand. Used only on complex types. */
DEFTREECODE (CONJ_EXPR, "conj_expr", tcc_unary, 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", tcc_expression, 2)
DEFTREECODE (PREINCREMENT_EXPR, "preincrement_expr", tcc_expression, 2)
DEFTREECODE (POSTDECREMENT_EXPR, "postdecrement_expr", tcc_expression, 2)
DEFTREECODE (POSTINCREMENT_EXPR, "postincrement_expr", tcc_expression, 2)
/* Used to implement `va_arg'. */
DEFTREECODE (VA_ARG_EXPR, "va_arg_expr", tcc_expression, 1)
/* Evaluate operand 0. If and only if an exception is thrown during
the evaluation of operand 0, evaluate operand 1.
This differs from TRY_FINALLY_EXPR in that operand 1 is not evaluated
on a normal or jump exit, only on an exception. */
DEFTREECODE (TRY_CATCH_EXPR, "try_catch_expr", tcc_statement, 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_expr", tcc_statement, 2)
/* Evaluate either the normal or the exceptional cleanup. This must
only be present as the cleanup expression in a TRY_FINALLY_EXPR.
If the TRY_FINALLY_EXPR completes normally, the first operand of
EH_ELSE_EXPR is used as a cleanup, otherwise the second operand is
used. */
DEFTREECODE (EH_ELSE_EXPR, "eh_else_expr", tcc_statement, 2)
/* These types of expressions have no useful value,
and always have side effects. */
/* Used to represent a local declaration. The operand is DECL_EXPR_DECL. */
DEFTREECODE (DECL_EXPR, "decl_expr", tcc_statement, 1)
/* 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", tcc_statement, 1)
/* 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", tcc_statement, 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", tcc_statement, 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", tcc_statement, 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", tcc_statement, 1)
/* Switch expression.
TREE_TYPE is the original type of the condition, before any
language required type conversions. It may be NULL, in which case
the original type and final types are assumed to be the same.
Operand 0 is the expression used to perform the branch,
Operand 1 is the body of the switch, which probably contains
CASE_LABEL_EXPRs. It may also be NULL, in which case operand 2
must not be NULL. */
DEFTREECODE (SWITCH_EXPR, "switch_expr", tcc_statement, 2)
/* Used to represent a case label.
Operand 0 is CASE_LOW. It may be NULL_TREE, in which case the label
is a 'default' label.
Operand 1 is CASE_HIGH. If it is NULL_TREE, the label is a simple
(one-value) case label. If it is non-NULL_TREE, the case is a range.
Operand 2 is CASE_LABEL, which has the corresponding LABEL_DECL.
Operand 3 is CASE_CHAIN. This operand is only used in tree-cfg.cc to
speed up the lookup of case labels which use a particular edge in
the control flow graph. */