| /* This file contains the definitions and documentation for the |
| tree codes used in GCC. |
| Copyright (C) 1987, 1988, 1993, 1995, 1997, 1998, 2000, 2001, 2004, 2005, |
| 2006, 2007, 2008, 2009, 2010 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). |
| 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 an inline 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 |
| containing a tree that is an expression for the size in bits. |
| 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 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. */ |
| |
| /* 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, |
| 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). |
| In the case of a subrange type in Pascal, the TREE_TYPE |
| of this will point at the supertype (another INTEGER_TYPE, |
| or an ENUMERAL_TYPE or BOOLEAN_TYPE). |
| Otherwise, the TREE_TYPE is zero. */ |
| DEFTREECODE (INTEGER_TYPE, "integer_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) |
| |
| /* _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) |
| |
| /* 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 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 or Pascal */ |
| DEFTREECODE (ARRAY_TYPE, "array_type", tcc_type, 0) |
| |
| /* Struct in C, or record in Pascal. */ |
| /* Special fields: |
| 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", 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. |
| 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) |
| |
| /* Expressions */ |
| |
| /* First, the constants. */ |
| |
| /* Contents are in TREE_INT_CST_LOW and TREE_INT_CST_HIGH fields, |
| 32 bits each, giving us a 64 bit constant capability. 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 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) |
| |
| /* Contents are in TREE_VECTOR_CST_ELTS field. */ |
| 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 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 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) |
| |
| /* 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) |
| |
| /* 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) |
| |
| /* 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. INDIRECT_REF, ALIGN_INDIRECT_REF, MISALIGNED_INDIRECT_REF. */ |
| |
| /* C unary `*' or Pascal `^'. One operand, an expression for a pointer. */ |
| DEFTREECODE (INDIRECT_REF, "indirect_ref", tcc_reference, 1) |
| |
| /* Like above, but aligns the referenced address (i.e, if the address |
| in P is not aligned on TYPE_ALIGN boundary, then &(*P) != P). */ |
| DEFTREECODE (ALIGN_INDIRECT_REF, "align_indirect_ref", tcc_reference, 1) |
| |
| /* Same as INDIRECT_REF, but also specifies the alignment of the referenced |
| address: |
| Operand 0 is the referenced address (a pointer); |
| Operand 1 is an INTEGER_CST which represents the alignment of the address, |
| or 0 if the alignment is unknown. */ |
| DEFTREECODE (MISALIGNED_INDIRECT_REF, "misaligned_indirect_ref", tcc_reference, 2) |
| |
| /* Used to represent lookup of runtime type dependent data. Often this is |
| a reference to a vtable, but it needn't be. 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: Something front-end specific used to resolve the |
| reference to something simpler, usually to the address of a DECL. |
| Never touched by the middle-end. Good choices would be either an |
| identifier or a vtable index. */ |
| DEFTREECODE (OBJ_TYPE_REF, "obj_type_ref", tcc_expression, 3) |
| |
| /* Constructor: return an aggregate value made from specified components. |
| In C, this is used only for structure and array initializers. |
| The operand is a sequence of component values made out of a VEC of |
| struct constructor_elt. |
| |
| 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.) |
| |
| For RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE: |
| The field INDEX of each node is a FIELD_DECL. */ |
| 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) |
| |
| /* 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) |
| |
| /* 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, 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 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 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) |
| |
| /* 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 the quotient toward infinity. */ |
| DEFTREECODE (CEIL_DIV_EXPR, "ceil_div_expr", tcc_binary, 2) |
| |
| /* Division for integer result that rounds toward minus infinity. */ |
| DEFTREECODE (FLOOR_DIV_EXPR, "floor_div_expr", tcc_binary, 2) |
| |
| /* Division for integer result that rounds 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. */ |
| DEFTREECODE (TRUNC_MOD_EXPR, "trunc_mod_expr", tcc_binary, 2) |
| DEFTREECODE (CEIL_MOD_EXPR, "ceil_mod_expr", tcc_binary, 2) |
| DEFTREECODE (FLOOR_MOD_EXPR, "floor_mod_expr", tcc_binary, 2) |
| 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) |
| |
| /* 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 are allowed only for integer (or pointer or enumeral) |
| 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", 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 (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) |
| |
| /* This is the reverse of uneq_expr. */ |
| DEFTREECODE (LTGT_EXPR, "ltgt_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) |
| |
| /* 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) |
| |
| /* 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 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 1. If and only if an exception is thrown during |
| the evaluation of operand 1, evaluate operand 2. |
| |
| This differs from TRY_FINALLY_EXPR in that operand 2 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", 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. |
| Operand 2 is either NULL_TREE or a TREE_VEC of the CASE_LABEL_EXPRs |
| of all the cases. */ |
| DEFTREECODE (SWITCH_EXPR, "switch_expr", tcc_statement, 3) |
| |
| /* Used to represent a case label. The operands are CASE_LOW and |
| CASE_HIGH, respectively. If CASE_LOW is NULL_TREE, the label is a |
| 'default' label. If CASE_HIGH is NULL_TREE, the label is a normal case |
| label. CASE_LABEL is the corresponding LABEL_DECL. */ |
| DEFTREECODE (CASE_LABEL_EXPR, "case_label_expr", tcc_statement, 3) |
| |
| /* Used to represent an inline assembly statement. ASM_STRING returns a |
| STRING_CST for the instruction (e.g., "mov x, y"). ASM_OUTPUTS, |
| ASM_INPUTS, and ASM_CLOBBERS represent the outputs, inputs, and clobbers |
| for the statement. ASM_LABELS, if present, indicates various destinations |
| for the asm; labels cannot be combined with outputs. */ |
| DEFTREECODE (ASM_EXPR, "asm_expr", tcc_statement, 5) |
| |
| /* Variable references for SSA analysis. New SSA names are created every |
| time a variable is assigned a new value. The SSA builder uses SSA_NAME |
| nodes to implement SSA versioning. */ |
| DEFTREECODE (SSA_NAME, "ssa_name", tcc_exceptional, 0) |
| |
| /* Used to represent a typed exception handler. CATCH_TYPES is the type (or |
| list of types) handled, and CATCH_BODY is the code for the handler. */ |
| DEFTREECODE (CATCH_EXPR, "catch_expr", tcc_statement, 2) |
| |
| /* Used to represent an exception specification. EH_FILTER_TYPES is a list |
| of allowed types, and EH_FILTER_FAILURE is an expression to evaluate on |
| failure. EH_FILTER_MUST_NOT_THROW controls which range type to use when |
| expanding. */ |
| DEFTREECODE (EH_FILTER_EXPR, "eh_filter_expr", tcc_statement, 2) |
| |
| /* Node used for describing a property that is known at compile |
| time. */ |
| DEFTREECODE (SCEV_KNOWN, "scev_known", tcc_expression, 0) |
| |
| /* Node used for describing a property that is not known at compile |
| time. */ |
| DEFTREECODE (SCEV_NOT_KNOWN, "scev_not_known", tcc_expression, 0) |
| |
| /* Polynomial chains of recurrences. |
| Under the form: cr = {CHREC_LEFT (cr), +, CHREC_RIGHT (cr)}. */ |
| DEFTREECODE (POLYNOMIAL_CHREC, "polynomial_chrec", tcc_expression, 3) |
| |
| /* Used to chain children of container statements together. |
| Use the interface in tree-iterator.h to access this node. */ |
| DEFTREECODE (STATEMENT_LIST, "statement_list", tcc_exceptional, 0) |
| |
| /* Predicate assertion. Artificial expression generated by the optimizers |
| to keep track of predicate values. This expression may only appear on |
| the RHS of assignments. |
| |
| Given X = ASSERT_EXPR <Y, EXPR>, the optimizers can infer |
| two things: |
| |
| 1- X is a copy of Y. |
| 2- EXPR is a conditional expression and is known to be true. |
| |
| Valid and to be expected forms of conditional expressions are |
| valid GIMPLE conditional expressions (as defined by is_gimple_condexpr) |
| and conditional expressions with the first operand being a |
| PLUS_EXPR with a variable possibly wrapped in a NOP_EXPR first |
| operand and an integer constant second operand. |
| |
| The type of the expression is the same as Y. */ |
| DEFTREECODE (ASSERT_EXPR, "assert_expr", tcc_expression, 2) |
| |
| /* Base class information. Holds information about a class as a |
| baseclass of itself or another class. */ |
| DEFTREECODE (TREE_BINFO, "tree_binfo", tcc_exceptional, 0) |
| |
| /* Records the size for an expression of variable size type. This is |
| for use in contexts in which we are accessing the entire object, |
| such as for a function call, or block copy. |
| Operand 0 is the real expression. |
| Operand 1 is the size of the type in the expression. */ |
| DEFTREECODE (WITH_SIZE_EXPR, "with_size_expr", tcc_expression, 2) |
| |
| /* Extract elements from two input vectors Operand 0 and Operand 1 |
| size VS, according to the offset OFF defined by Operand 2 as |
| follows: |
| If OFF > 0, the last VS - OFF elements of vector OP0 are concatenated to |
| the first OFF elements of the vector OP1. |
| If OFF == 0, then the returned vector is OP1. |
| On different targets OFF may take different forms; It can be an address, in |
| which case its low log2(VS)-1 bits define the offset, or it can be a mask |
| generated by the builtin targetm.vectorize.mask_for_load_builtin_decl. */ |
| DEFTREECODE (REALIGN_LOAD_EXPR, "realign_load", tcc_expression, 3) |
| |
| /* Low-level memory addressing. Operands are SYMBOL (static or global |
| variable), BASE (register), INDEX (register), STEP (integer constant), |
| OFFSET (integer constant). Corresponding address is |
| SYMBOL + BASE + STEP * INDEX + OFFSET. Only variations and values valid on |
| the target are allowed. |
| |
| The type of STEP, INDEX and OFFSET is sizetype. The type of BASE is |
| sizetype or a pointer type (if SYMBOL is NULL). |
| |
| The sixth argument is the reference to the original memory access, which |
| is preserved for the purpose of alias analysis. */ |
| |
| DEFTREECODE (TARGET_MEM_REF, "target_mem_ref", tcc_reference, 6) |
| |
| /* The ordering of the codes between OMP_PARALLEL and OMP_CRITICAL is |
| exposed to TREE_RANGE_CHECK. */ |
| /* OpenMP - #pragma omp parallel [clause1 ... clauseN] |
| Operand 0: OMP_PARALLEL_BODY: Code to be executed by all threads. |
| Operand 1: OMP_PARALLEL_CLAUSES: List of clauses. */ |
| |
| DEFTREECODE (OMP_PARALLEL, "omp_parallel", tcc_statement, 2) |
| |
| /* OpenMP - #pragma omp task [clause1 ... clauseN] |
| Operand 0: OMP_TASK_BODY: Code to be executed by all threads. |
| Operand 1: OMP_TASK_CLAUSES: List of clauses. */ |
| |
| DEFTREECODE (OMP_TASK, "omp_task", tcc_statement, 2) |
| |
| /* OpenMP - #pragma omp for [clause1 ... clauseN] |
| Operand 0: OMP_FOR_BODY: Loop body. |
| Operand 1: OMP_FOR_CLAUSES: List of clauses. |
| Operand 2: OMP_FOR_INIT: Initialization code of the form |
| VAR = N1. |
| Operand 3: OMP_FOR_COND: Loop conditional expression of the form |
| VAR { <, >, <=, >= } N2. |
| Operand 4: OMP_FOR_INCR: Loop index increment of the form |
| VAR { +=, -= } INCR. |
| Operand 5: OMP_FOR_PRE_BODY: Filled by the gimplifier with things |
| from INIT, COND, and INCR that are technically part of the |
| OMP_FOR structured block, but are evaluated before the loop |
| body begins. |
| |
| VAR must be an integer or pointer variable, which is implicitly thread |
| private. N1, N2 and INCR are required to be loop invariant integer |
| expressions that are evaluated without any synchronization. |
| The evaluation order, frequency of evaluation and side-effects are |
| unspecified by the standard. */ |
| DEFTREECODE (OMP_FOR, "omp_for", tcc_statement, 6) |
| |
| /* OpenMP - #pragma omp sections [clause1 ... clauseN] |
| Operand 0: OMP_SECTIONS_BODY: Sections body. |
| Operand 1: OMP_SECTIONS_CLAUSES: List of clauses. */ |
| DEFTREECODE (OMP_SECTIONS, "omp_sections", tcc_statement, 2) |
| |
| /* OpenMP - #pragma omp single |
| Operand 0: OMP_SINGLE_BODY: Single section body. |
| Operand 1: OMP_SINGLE_CLAUSES: List of clauses. */ |
| DEFTREECODE (OMP_SINGLE, "omp_single", tcc_statement, 2) |
| |
| /* OpenMP - #pragma omp section |
| Operand 0: OMP_SECTION_BODY: Section body. */ |
| DEFTREECODE (OMP_SECTION, "omp_section", tcc_statement, 1) |
| |
| /* OpenMP - #pragma omp master |
| Operand 0: OMP_MASTER_BODY: Master section body. */ |
| DEFTREECODE (OMP_MASTER, "omp_master", tcc_statement, 1) |
| |
| /* OpenMP - #pragma omp ordered |
| Operand 0: OMP_ORDERED_BODY: Master section body. */ |
| DEFTREECODE (OMP_ORDERED, "omp_ordered", tcc_statement, 1) |
| |
| /* OpenMP - #pragma omp critical [name] |
| Operand 0: OMP_CRITICAL_BODY: Critical section body. |
| Operand 1: OMP_CRITICAL_NAME: Identifier for critical section. */ |
| DEFTREECODE (OMP_CRITICAL, "omp_critical", tcc_statement, 2) |
| |
| /* OpenMP - #pragma omp atomic |
| Operand 0: The address at which the atomic operation is to be performed. |
| This address should be stabilized with save_expr. |
| Operand 1: The expression to evaluate. When the old value of the object |
| at the address is used in the expression, it should appear as if |
| build_fold_indirect_ref of the address. */ |
| DEFTREECODE (OMP_ATOMIC, "omp_atomic", tcc_statement, 2) |
| |
| /* OpenMP clauses. */ |
| DEFTREECODE (OMP_CLAUSE, "omp_clause", tcc_exceptional, 0) |
| |
| /* Reduction operations. |
| Operations that take a vector of elements and "reduce" it to a scalar |
| result (e.g. summing the elements of the vector, finding the minimum over |
| the vector elements, etc). |
| Operand 0 is a vector; the first element in the vector has the result. |
| Operand 1 is a vector. */ |
| DEFTREECODE (REDUC_MAX_EXPR, "reduc_max_expr", tcc_unary, 1) |
| DEFTREECODE (REDUC_MIN_EXPR, "reduc_min_expr", tcc_unary, 1) |
| DEFTREECODE (REDUC_PLUS_EXPR, "reduc_plus_expr", tcc_unary, 1) |
| |
| /* Widening dot-product. |
| The first two arguments are of type t1. |
| The third argument and the result are of type t2, such that t2 is at least |
| twice the size of t1. DOT_PROD_EXPR(arg1,arg2,arg3) is equivalent to: |
| tmp = WIDEN_MULT_EXPR(arg1, arg2); |
| arg3 = PLUS_EXPR (tmp, arg3); |
| or: |
| tmp = WIDEN_MULT_EXPR(arg1, arg2); |
| arg3 = WIDEN_SUM_EXPR (tmp, arg3); */ |
| DEFTREECODE (DOT_PROD_EXPR, "dot_prod_expr", tcc_expression, 3) |
| |
| /* Widening summation. |
| The first argument is of type t1. |
| The second argument is of type t2, such that t2 is at least twice |
| the size of t1. The type of the entire expression is also t2. |
| WIDEN_SUM_EXPR is equivalent to first widening (promoting) |
| the first argument from type t1 to type t2, and then summing it |
| with the second argument. */ |
| DEFTREECODE (WIDEN_SUM_EXPR, "widen_sum_expr", tcc_binary, 2) |
| |
| /* Widening multiplication. |
| The two arguments are of type t1. |
| The result is of type t2, such that t2 is at least twice |
| the size of t1. WIDEN_MULT_EXPR is equivalent to first widening (promoting) |
| the arguments from type t1 to type t2, and then multiplying them. */ |
| DEFTREECODE (WIDEN_MULT_EXPR, "widen_mult_expr", tcc_binary, 2) |
| |
| /* Whole vector left/right shift in bits. |
| Operand 0 is a vector to be shifted. |
| Operand 1 is an integer shift amount in bits. */ |
| DEFTREECODE (VEC_LSHIFT_EXPR, "vec_lshift_expr", tcc_binary, 2) |
| DEFTREECODE (VEC_RSHIFT_EXPR, "vec_rshift_expr", tcc_binary, 2) |
| |
| /* Widening vector multiplication. |
| The two operands are vectors with N elements of size S. Multiplying the |
| elements of the two vectors will result in N products of size 2*S. |
| VEC_WIDEN_MULT_HI_EXPR computes the N/2 high products. |
| VEC_WIDEN_MULT_LO_EXPR computes the N/2 low products. */ |
| DEFTREECODE (VEC_WIDEN_MULT_HI_EXPR, "widen_mult_hi_expr", tcc_binary, 2) |
| DEFTREECODE (VEC_WIDEN_MULT_LO_EXPR, "widen_mult_lo_expr", tcc_binary, 2) |
| |
| /* Unpack (extract and promote/widen) the high/low elements of the input |
| vector into the output vector. The input vector has twice as many |
| elements as the output vector, that are half the size of the elements |
| of the output vector. This is used to support type promotion. */ |
| DEFTREECODE (VEC_UNPACK_HI_EXPR, "vec_unpack_hi_expr", tcc_unary, 1) |
| DEFTREECODE (VEC_UNPACK_LO_EXPR, "vec_unpack_lo_expr", tcc_unary, 1) |
| |
| /* Unpack (extract) the high/low elements of the input vector, convert |
| fixed point values to floating point and widen elements into the |
| output vector. The input vector has twice as many elements as the output |
| vector, that are half the size of the elements of the output vector. */ |
| DEFTREECODE (VEC_UNPACK_FLOAT_HI_EXPR, "vec_unpack_float_hi_expr", tcc_unary, 1) |
| DEFTREECODE (VEC_UNPACK_FLOAT_LO_EXPR, "vec_unpack_float_lo_expr", tcc_unary, 1) |
| |
| /* Pack (demote/narrow and merge) the elements of the two input vectors |
| into the output vector using truncation/saturation. |
| The elements of the input vectors are twice the size of the elements of the |
| output vector. This is used to support type demotion. */ |
| DEFTREECODE (VEC_PACK_TRUNC_EXPR, "vec_pack_trunc_expr", tcc_binary, 2) |
| DEFTREECODE (VEC_PACK_SAT_EXPR, "vec_pack_sat_expr", tcc_binary, 2) |
| |
| /* Convert floating point values of the two input vectors to integer |
| and pack (narrow and merge) the elements into the output vector. The |
| elements of the input vector are twice the size of the elements of |
| the output vector. */ |
| DEFTREECODE (VEC_PACK_FIX_TRUNC_EXPR, "vec_pack_fix_trunc_expr", tcc_binary, 2) |
| |
| /* Extract even/odd fields from vectors. */ |
| DEFTREECODE (VEC_EXTRACT_EVEN_EXPR, "vec_extracteven_expr", tcc_binary, 2) |
| DEFTREECODE (VEC_EXTRACT_ODD_EXPR, "vec_extractodd_expr", tcc_binary, 2) |
| |
| /* Merge input vectors interleaving their fields. */ |
| DEFTREECODE (VEC_INTERLEAVE_HIGH_EXPR, "vec_interleavehigh_expr", tcc_binary, 2) |
| DEFTREECODE (VEC_INTERLEAVE_LOW_EXPR, "vec_interleavelow_expr", tcc_binary, 2) |
| |
| /* PREDICT_EXPR. Specify hint for branch prediction. The |
| PREDICT_EXPR_PREDICTOR specify predictor and PREDICT_EXPR_OUTCOME the |
| outcome (0 for not taken and 1 for taken). Once the profile is guessed |
| all conditional branches leading to execution paths executing the |
| PREDICT_EXPR will get predicted by the specified predictor. */ |
| DEFTREECODE (PREDICT_EXPR, "predict_expr", tcc_expression, 1) |
| |
| /* OPTIMIZATION_NODE. Node to store the optimization options. */ |
| DEFTREECODE (OPTIMIZATION_NODE, "optimization_node", tcc_exceptional, 0) |
| |
| /* TARGET_OPTION_NODE. Node to store the target specific options. */ |
| DEFTREECODE (TARGET_OPTION_NODE, "target_option_node", tcc_exceptional, 0) |
| |
| /* |
| Local variables: |
| mode:c |
| End: |
| */ |
