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- /* Standard language operator definitions for GDB, the GNU debugger.
- Copyright (C) 1986-2022 Free Software Foundation, Inc.
- This file is part of GDB.
- This program 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 of the License, or
- (at your option) any later version.
- This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
- /* Used when it's necessary to pass an opcode which will be ignored,
- or to catch uninitialized values. */
- OP (OP_NULL)
- /* BINOP_... operate on two values computed by following subexpressions,
- replacing them by one result value. They take no immediate arguments. */
- OP (BINOP_ADD) /* + */
- OP (BINOP_SUB) /* - */
- OP (BINOP_MUL) /* * */
- OP (BINOP_DIV) /* / */
- OP (BINOP_REM) /* % */
- OP (BINOP_MOD) /* mod (Knuth 1.2.4) */
- OP (BINOP_LSH) /* << */
- OP (BINOP_RSH) /* >> */
- OP (BINOP_LOGICAL_AND) /* && */
- OP (BINOP_LOGICAL_OR) /* || */
- OP (BINOP_BITWISE_AND) /* & */
- OP (BINOP_BITWISE_IOR) /* | */
- OP (BINOP_BITWISE_XOR) /* ^ */
- OP (BINOP_EQUAL) /* == */
- OP (BINOP_NOTEQUAL) /* != */
- OP (BINOP_LESS) /* < */
- OP (BINOP_GTR) /* > */
- OP (BINOP_LEQ) /* <= */
- OP (BINOP_GEQ) /* >= */
- OP (BINOP_REPEAT) /* @ */
- OP (BINOP_ASSIGN) /* = */
- OP (BINOP_COMMA) /* , */
- OP (BINOP_SUBSCRIPT) /* x[y] */
- OP (BINOP_EXP) /* Exponentiation */
- /* C++. */
- OP (BINOP_MIN) /* <? */
- OP (BINOP_MAX) /* >? */
- /* STRUCTOP_MEMBER is used for pointer-to-member constructs.
- X . * Y translates into X STRUCTOP_MEMBER Y. */
- OP (STRUCTOP_MEMBER)
- /* STRUCTOP_MPTR is used for pointer-to-member constructs
- when X is a pointer instead of an aggregate. */
- OP (STRUCTOP_MPTR)
- /* TYPE_INSTANCE is used when the user specifies a specific
- type instantiation for overloaded methods/functions.
- The format is:
- TYPE_INSTANCE num_types type0 ... typeN num_types TYPE_INSTANCE. */
- OP (TYPE_INSTANCE)
- /* end of C++. */
- /* For Modula-2 integer division DIV. */
- OP (BINOP_INTDIV)
- /* +=, -=, *=, and so on. The following exp_element is another opcode,
- a BINOP_, saying how to modify. Then comes another BINOP_ASSIGN_MODIFY,
- making three exp_elements in total. */
- OP (BINOP_ASSIGN_MODIFY)
- /* Modula-2 standard (binary) procedures. */
- OP (BINOP_VAL)
- /* Concatenate two operands, such as character strings or bitstrings.
- If the first operand is a integer expression, then it means concatenate
- the second operand with itself that many times. */
- OP (BINOP_CONCAT)
- /* Operates on three values computed by following subexpressions. */
- OP (TERNOP_COND) /* ?: */
- /* A sub-string/sub-array. Ada syntax: OP1(OP2..OP3). Return
- elements OP2 through OP3 of OP1. */
- OP (TERNOP_SLICE)
- /* Multidimensional subscript operator, such as Modula-2 x[a,b,...].
- The dimensionality is encoded in the operator, like the number of
- function arguments in OP_FUNCALL, I.E. <OP><dimension><OP>.
- The value of the first following subexpression is subscripted
- by each of the next following subexpressions, one per dimension. */
- OP (MULTI_SUBSCRIPT)
- /* The OP_... series take immediate following arguments.
- After the arguments come another OP_... (the same one)
- so that the grouping can be recognized from the end. */
- /* OP_LONG is followed by a type pointer in the next exp_element
- and the long constant value in the following exp_element.
- Then comes another OP_LONG.
- Thus, the operation occupies four exp_elements. */
- OP (OP_LONG)
- /* OP_FLOAT is similar but takes a floating-point constant encoded in
- the target format for the given type instead of a long. */
- OP (OP_FLOAT)
- /* OP_VAR_VALUE takes one struct block * in the following element,
- and one struct symbol * in the following exp_element, followed
- by another OP_VAR_VALUE, making four exp_elements. If the
- block is non-NULL, evaluate the symbol relative to the
- innermost frame executing in that block; if the block is NULL
- use the selected frame. */
- OP (OP_VAR_VALUE)
- /* OP_VAR_ENTRY_VALUE takes one struct symbol * in the following element,
- followed by another OP_VAR_ENTRY_VALUE, making three exp_elements.
- somename@entry may mean parameter value as present at the entry of the
- current function. Implemented via DW_OP_entry_value. */
- OP (OP_VAR_ENTRY_VALUE)
- /* OP_VAR_MSYM_VALUE takes one struct objfile * in the following
- element, and one struct minimal_symbol * in the following
- exp_element, followed by another OP_VAR_MSYM_VALUE, making four
- exp_elements. */
- OP (OP_VAR_MSYM_VALUE)
- /* OP_LAST is followed by an integer in the next exp_element.
- The integer is zero for the last value printed,
- or it is the absolute number of a history element.
- With another OP_LAST at the end, this makes three exp_elements. */
- OP (OP_LAST)
- /* OP_REGISTER is followed by a string in the next exp_element.
- This is the name of a register to fetch. */
- OP (OP_REGISTER)
- /* OP_INTERNALVAR is followed by an internalvar ptr in the next
- exp_element. With another OP_INTERNALVAR at the end, this
- makes three exp_elements. */
- OP (OP_INTERNALVAR)
- /* OP_FUNCALL is followed by an integer in the next exp_element.
- The integer is the number of args to the function call.
- That many plus one values from following subexpressions
- are used, the first one being the function.
- The integer is followed by a repeat of OP_FUNCALL,
- making three exp_elements. */
- OP (OP_FUNCALL)
- /* OP_OBJC_MSGCALL is followed by a string in the next exp_element
- and then an integer. The string is the selector string. The
- integer is the number of arguments to the message call. That
- many plus one values are used, the first one being the object
- pointer. This is an Objective C message. */
- OP (OP_OBJC_MSGCALL)
- /* OP_COMPLEX takes a type in the following element, followed by another
- OP_COMPLEX, making three exp_elements. It is followed by two double
- args, and converts them into a complex number of the given type. */
- OP (OP_COMPLEX)
- /* OP_STRING represents a string constant.
- Its format is the same as that of a STRUCTOP, but the string
- data is just made into a string constant when the operation
- is executed. */
- OP (OP_STRING)
- /* OP_ARRAY creates an array constant out of the following subexpressions.
- It is followed by two exp_elements, the first containing an integer
- that is the lower bound of the array and the second containing another
- integer that is the upper bound of the array. The second integer is
- followed by a repeat of OP_ARRAY, making four exp_elements total.
- The bounds are used to compute the number of following subexpressions
- to consume, as well as setting the bounds in the created array constant.
- The type of the elements is taken from the type of the first subexp,
- and they must all match. */
- OP (OP_ARRAY)
- /* UNOP_EXTRACT takes a value and a type, like a cast, but, instead of
- casting the value to the given type, a new value (of the given
- type) is extracted from the contents of the old value, starting
- from the least significant byte.
- It is invalid for the given type to be larger than the type of the
- given value. */
- OP (UNOP_EXTRACT)
- /* UNOP_CAST is followed by a type pointer in the next exp_element.
- With another UNOP_CAST at the end, this makes three exp_elements.
- It casts the value of the following subexpression. */
- OP (UNOP_CAST)
- /* Like UNOP_CAST, but the type is a subexpression. */
- OP (UNOP_CAST_TYPE)
- /* The C++ dynamic_cast operator. */
- OP (UNOP_DYNAMIC_CAST)
- /* The C++ reinterpret_cast operator. */
- OP (UNOP_REINTERPRET_CAST)
- /* UNOP_MEMVAL is followed by a type pointer in the next exp_element
- With another UNOP_MEMVAL at the end, this makes three exp_elements.
- It casts the contents of the word addressed by the value of the
- following subexpression. */
- OP (UNOP_MEMVAL)
- /* Like UNOP_MEMVAL, but the type is supplied as a subexpression. */
- OP (UNOP_MEMVAL_TYPE)
- /* UNOP_... operate on one value from a following subexpression
- and replace it with a result. They take no immediate arguments. */
- OP (UNOP_NEG) /* Unary - */
- OP (UNOP_LOGICAL_NOT) /* Unary ! */
- OP (UNOP_COMPLEMENT) /* Unary ~ */
- OP (UNOP_IND) /* Unary * */
- OP (UNOP_ADDR) /* Unary & */
- OP (UNOP_PREINCREMENT) /* ++ before an expression */
- OP (UNOP_POSTINCREMENT) /* ++ after an expression */
- OP (UNOP_PREDECREMENT) /* -- before an expression */
- OP (UNOP_POSTDECREMENT) /* -- after an expression */
- OP (UNOP_SIZEOF) /* Unary sizeof (followed by expression) */
- OP (UNOP_ALIGNOF) /* Unary alignof (followed by expression) */
- OP (UNOP_PLUS) /* Unary plus */
- OP (UNOP_ABS)
- OP (UNOP_HIGH)
- OP (OP_BOOL) /* Modula-2 builtin BOOLEAN type */
- /* STRUCTOP_... operate on a value from a following subexpression
- by extracting a structure component specified by a string
- that appears in the following exp_elements (as many as needed).
- STRUCTOP_STRUCT is used for "." and STRUCTOP_PTR for "->".
- They differ only in the error message given in case the value is
- not suitable or the structure component specified is not found.
- The length of the string follows the opcode, followed by
- BYTES_TO_EXP_ELEM(length) elements containing the data of the
- string, followed by the length again and the opcode again. */
- OP (STRUCTOP_STRUCT)
- OP (STRUCTOP_PTR)
- /* Anonymous field access, e.g. "foo.3". Used in Rust. */
- OP (STRUCTOP_ANONYMOUS)
- /* C++: OP_THIS is just a placeholder for the class instance variable.
- It just comes in a tight (OP_THIS, OP_THIS) pair. */
- OP (OP_THIS)
- /* Objective C: "@selector" pseudo-operator. */
- OP (OP_OBJC_SELECTOR)
- /* OP_SCOPE surrounds a type name and a field name. The type
- name is encoded as one element, but the field name stays as
- a string, which, of course, is variable length. */
- OP (OP_SCOPE)
- /* OP_FUNC_STATIC_VAR refers to a function local static variable. The
- function is taken from the following subexpression. The length of
- the variable name as a string follows the opcode, followed by
- BYTES_TO_EXP_ELEM(length) elements containing the data of the
- string, followed by the length again and the opcode again.
- Note this is used by C++, but not C. The C parser handles local
- static variables in the parser directly. Also, this is only used
- in C++ if the function/method name is not quoted, like e.g.:
- p S:method()::var
- p S:method() const::var
- If the function/method is quoted like instead:
- p 'S:method() const'::var
- then the C-specific handling directly in the parser takes over (see
- block/variable productions).
- Also, if the whole function+var is quoted like this:
- p 'S:method() const::var'
- then the whole quoted expression is interpreted as a single symbol
- name and we don't use OP_FUNC_STATIC_VAR either. In that case, the
- C++-specific symbol lookup routines take care of the
- function-local-static search. */
- OP (OP_FUNC_STATIC_VAR)
- /* OP_TYPE is for parsing types, and used with the "ptype" command
- so we can look up types that are qualified by scope, either with
- the GDB "::" operator, or the Modula-2 '.' operator. */
- OP (OP_TYPE)
- /* An Objective C Foundation Class NSString constant. */
- OP (OP_OBJC_NSSTRING)
- /* An array range operator (in Fortran 90, for "exp:exp", "exp:",
- ":exp" and ":"). */
- OP (OP_RANGE)
- /* OP_ADL_FUNC specifies that the function is to be looked up in an
- Argument Dependent manner (Koenig lookup). */
- OP (OP_ADL_FUNC)
- /* The typeof operator. This has one expression argument, which is
- evaluated solely for its type. */
- OP (OP_TYPEOF)
- /* The decltype operator. This has one expression argument, which is
- evaluated solely for its type. This is similar to typeof, but has
- slight different semantics. */
- OP (OP_DECLTYPE)
- /* The typeid operator. This has one expression argument. */
- OP (OP_TYPEID)
- /* This is used for the Rust [expr; N] form of array construction. It
- takes two expression arguments. */
- OP (OP_RUST_ARRAY)
- /* ================ Ada operators ================ */
- /* X IN A'RANGE(N). N is an immediate operand, surrounded by
- BINOP_IN_BOUNDS before and after. A is an array, X an index
- value. Evaluates to true iff X is within range of the Nth
- dimension (1-based) of A. (A multi-dimensional array
- type is represented as array of array of ...) */
- OP (BINOP_IN_BOUNDS)
- /* X IN L .. U. True iff L <= X <= U. */
- OP (TERNOP_IN_RANGE)
- /* Ada attributes ('Foo). */
- OP (OP_ATR_FIRST)
- OP (OP_ATR_LAST)
- OP (OP_ATR_LENGTH)
- OP (OP_ATR_POS)
- OP (OP_ATR_SIZE)
- OP (OP_ATR_TAG)
- OP (OP_ATR_VAL)
- /* Ada type qualification. It is encoded as for UNOP_CAST, above,
- and denotes the TYPE'(EXPR) construct. */
- OP (UNOP_QUAL)
- /* X IN TYPE. The `TYPE' argument is immediate, with
- UNOP_IN_RANGE before and after it. True iff X is a member of
- type TYPE (typically a subrange). */
- OP (UNOP_IN_RANGE)
- /* An aggregate. A single immediate operand, N>0, gives
- the number of component specifications that follow. The
- immediate operand is followed by a second OP_AGGREGATE.
- Next come N component specifications. A component
- specification is either an OP_OTHERS (others=>...), an
- OP_CHOICES (for named associations), or other expression (for
- positional aggregates only). Aggregates currently
- occur only as the right sides of assignments. */
- OP (OP_AGGREGATE)
- /* ================ Fortran operators ================ */
- /* This is EXACTLY like OP_FUNCALL but is semantically different.
- In F77, array subscript expressions, substring expressions and
- function calls are all exactly the same syntactically. They
- may only be disambiguated at runtime. Thus this operator,
- which indicates that we have found something of the form
- <name> ( <stuff> ). */
- OP (OP_F77_UNDETERMINED_ARGLIST)
- /* Single operand builtins. */
- OP (UNOP_FORTRAN_KIND)
- OP (UNOP_FORTRAN_FLOOR)
- OP (UNOP_FORTRAN_CEILING)
- OP (UNOP_FORTRAN_ALLOCATED)
- OP (UNOP_FORTRAN_RANK)
- OP (UNOP_FORTRAN_SHAPE)
- OP (UNOP_FORTRAN_LOC)
- /* Two operand builtins. */
- OP (BINOP_FORTRAN_CMPLX)
- OP (BINOP_FORTRAN_MODULO)
- /* Builtins that take one or two operands. */
- OP (FORTRAN_LBOUND)
- OP (FORTRAN_UBOUND)
- OP (FORTRAN_ASSOCIATED)
- OP (FORTRAN_ARRAY_SIZE)
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