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445 lines
16 KiB
Modula-2
445 lines
16 KiB
Modula-2
/* Standard language operator definitions for GDB, the GNU debugger.
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Copyright (C) 1986-2021 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Used when it's necessary to pass an opcode which will be ignored,
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or to catch uninitialized values. */
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OP (OP_NULL)
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/* BINOP_... operate on two values computed by following subexpressions,
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replacing them by one result value. They take no immediate arguments. */
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OP (BINOP_ADD) /* + */
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OP (BINOP_SUB) /* - */
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OP (BINOP_MUL) /* * */
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OP (BINOP_DIV) /* / */
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OP (BINOP_REM) /* % */
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OP (BINOP_MOD) /* mod (Knuth 1.2.4) */
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OP (BINOP_LSH) /* << */
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OP (BINOP_RSH) /* >> */
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OP (BINOP_LOGICAL_AND) /* && */
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OP (BINOP_LOGICAL_OR) /* || */
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OP (BINOP_BITWISE_AND) /* & */
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OP (BINOP_BITWISE_IOR) /* | */
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OP (BINOP_BITWISE_XOR) /* ^ */
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OP (BINOP_EQUAL) /* == */
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OP (BINOP_NOTEQUAL) /* != */
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OP (BINOP_LESS) /* < */
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OP (BINOP_GTR) /* > */
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OP (BINOP_LEQ) /* <= */
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OP (BINOP_GEQ) /* >= */
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OP (BINOP_REPEAT) /* @ */
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OP (BINOP_ASSIGN) /* = */
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OP (BINOP_COMMA) /* , */
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OP (BINOP_SUBSCRIPT) /* x[y] */
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OP (BINOP_EXP) /* Exponentiation */
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/* C++. */
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OP (BINOP_MIN) /* <? */
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OP (BINOP_MAX) /* >? */
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/* STRUCTOP_MEMBER is used for pointer-to-member constructs.
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X . * Y translates into X STRUCTOP_MEMBER Y. */
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OP (STRUCTOP_MEMBER)
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/* STRUCTOP_MPTR is used for pointer-to-member constructs
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when X is a pointer instead of an aggregate. */
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OP (STRUCTOP_MPTR)
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/* TYPE_INSTANCE is used when the user specifies a specific
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type instantiation for overloaded methods/functions.
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The format is:
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TYPE_INSTANCE num_types type0 ... typeN num_types TYPE_INSTANCE. */
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OP (TYPE_INSTANCE)
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/* end of C++. */
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/* For Modula-2 integer division DIV. */
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OP (BINOP_INTDIV)
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/* +=, -=, *=, and so on. The following exp_element is another opcode,
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a BINOP_, saying how to modify. Then comes another BINOP_ASSIGN_MODIFY,
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making three exp_elements in total. */
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OP (BINOP_ASSIGN_MODIFY)
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/* Modula-2 standard (binary) procedures. */
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OP (BINOP_VAL)
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/* Concatenate two operands, such as character strings or bitstrings.
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If the first operand is a integer expression, then it means concatenate
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the second operand with itself that many times. */
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OP (BINOP_CONCAT)
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/* This must be the highest BINOP_ value, for expprint.c. */
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OP (BINOP_END)
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/* Operates on three values computed by following subexpressions. */
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OP (TERNOP_COND) /* ?: */
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/* A sub-string/sub-array. Ada syntax: OP1(OP2..OP3). Return
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elements OP2 through OP3 of OP1. */
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OP (TERNOP_SLICE)
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/* Multidimensional subscript operator, such as Modula-2 x[a,b,...].
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The dimensionality is encoded in the operator, like the number of
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function arguments in OP_FUNCALL, I.E. <OP><dimension><OP>.
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The value of the first following subexpression is subscripted
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by each of the next following subexpressions, one per dimension. */
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OP (MULTI_SUBSCRIPT)
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/* The OP_... series take immediate following arguments.
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After the arguments come another OP_... (the same one)
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so that the grouping can be recognized from the end. */
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/* OP_LONG is followed by a type pointer in the next exp_element
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and the long constant value in the following exp_element.
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Then comes another OP_LONG.
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Thus, the operation occupies four exp_elements. */
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OP (OP_LONG)
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/* OP_FLOAT is similar but takes a floating-point constant encoded in
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the target format for the given type instead of a long. */
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OP (OP_FLOAT)
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/* OP_VAR_VALUE takes one struct block * in the following element,
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and one struct symbol * in the following exp_element, followed
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by another OP_VAR_VALUE, making four exp_elements. If the
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block is non-NULL, evaluate the symbol relative to the
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innermost frame executing in that block; if the block is NULL
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use the selected frame. */
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OP (OP_VAR_VALUE)
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/* OP_VAR_ENTRY_VALUE takes one struct symbol * in the following element,
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followed by another OP_VAR_ENTRY_VALUE, making three exp_elements.
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somename@entry may mean parameter value as present at the entry of the
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current function. Implemented via DW_OP_entry_value. */
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OP (OP_VAR_ENTRY_VALUE)
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/* OP_VAR_MSYM_VALUE takes one struct objfile * in the following
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element, and one struct minimal_symbol * in the following
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exp_element, followed by another OP_VAR_MSYM_VALUE, making four
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exp_elements. */
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OP (OP_VAR_MSYM_VALUE)
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/* OP_LAST is followed by an integer in the next exp_element.
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The integer is zero for the last value printed,
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or it is the absolute number of a history element.
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With another OP_LAST at the end, this makes three exp_elements. */
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OP (OP_LAST)
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/* OP_REGISTER is followed by a string in the next exp_element.
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This is the name of a register to fetch. */
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OP (OP_REGISTER)
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/* OP_INTERNALVAR is followed by an internalvar ptr in the next
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exp_element. With another OP_INTERNALVAR at the end, this
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makes three exp_elements. */
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OP (OP_INTERNALVAR)
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/* OP_FUNCALL is followed by an integer in the next exp_element.
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The integer is the number of args to the function call.
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That many plus one values from following subexpressions
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are used, the first one being the function.
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The integer is followed by a repeat of OP_FUNCALL,
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making three exp_elements. */
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OP (OP_FUNCALL)
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/* OP_OBJC_MSGCALL is followed by a string in the next exp_element
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and then an integer. The string is the selector string. The
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integer is the number of arguments to the message call. That
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many plus one values are used, the first one being the object
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pointer. This is an Objective C message. */
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OP (OP_OBJC_MSGCALL)
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/* OP_COMPLEX takes a type in the following element, followed by another
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OP_COMPLEX, making three exp_elements. It is followed by two double
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args, and converts them into a complex number of the given type. */
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OP (OP_COMPLEX)
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/* OP_STRING represents a string constant.
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Its format is the same as that of a STRUCTOP, but the string
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data is just made into a string constant when the operation
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is executed. */
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OP (OP_STRING)
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/* OP_ARRAY creates an array constant out of the following subexpressions.
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It is followed by two exp_elements, the first containing an integer
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that is the lower bound of the array and the second containing another
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integer that is the upper bound of the array. The second integer is
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followed by a repeat of OP_ARRAY, making four exp_elements total.
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The bounds are used to compute the number of following subexpressions
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to consume, as well as setting the bounds in the created array constant.
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The type of the elements is taken from the type of the first subexp,
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and they must all match. */
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OP (OP_ARRAY)
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/* UNOP_CAST is followed by a type pointer in the next exp_element.
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With another UNOP_CAST at the end, this makes three exp_elements.
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It casts the value of the following subexpression. */
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OP (UNOP_CAST)
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/* Like UNOP_CAST, but the type is a subexpression. */
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OP (UNOP_CAST_TYPE)
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/* The C++ dynamic_cast operator. */
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OP (UNOP_DYNAMIC_CAST)
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/* The C++ reinterpret_cast operator. */
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OP (UNOP_REINTERPRET_CAST)
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/* UNOP_MEMVAL is followed by a type pointer in the next exp_element
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With another UNOP_MEMVAL at the end, this makes three exp_elements.
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It casts the contents of the word addressed by the value of the
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following subexpression. */
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OP (UNOP_MEMVAL)
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/* Like UNOP_MEMVAL, but the type is supplied as a subexpression. */
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OP (UNOP_MEMVAL_TYPE)
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/* UNOP_... operate on one value from a following subexpression
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and replace it with a result. They take no immediate arguments. */
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OP (UNOP_NEG) /* Unary - */
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OP (UNOP_LOGICAL_NOT) /* Unary ! */
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OP (UNOP_COMPLEMENT) /* Unary ~ */
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OP (UNOP_IND) /* Unary * */
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OP (UNOP_ADDR) /* Unary & */
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OP (UNOP_PREINCREMENT) /* ++ before an expression */
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OP (UNOP_POSTINCREMENT) /* ++ after an expression */
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OP (UNOP_PREDECREMENT) /* -- before an expression */
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OP (UNOP_POSTDECREMENT) /* -- after an expression */
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OP (UNOP_SIZEOF) /* Unary sizeof (followed by expression) */
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OP (UNOP_ALIGNOF) /* Unary alignof (followed by expression) */
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OP (UNOP_PLUS) /* Unary plus */
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OP (UNOP_CAP) /* Modula-2 standard (unary) procedures */
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OP (UNOP_CHR)
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OP (UNOP_ORD)
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OP (UNOP_ABS)
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OP (UNOP_FLOAT)
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OP (UNOP_HIGH)
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OP (UNOP_MAX)
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OP (UNOP_MIN)
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OP (UNOP_ODD)
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OP (UNOP_TRUNC)
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OP (OP_BOOL) /* Modula-2 builtin BOOLEAN type */
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OP (OP_M2_STRING) /* Modula-2 string constants */
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/* STRUCTOP_... operate on a value from a following subexpression
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by extracting a structure component specified by a string
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that appears in the following exp_elements (as many as needed).
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STRUCTOP_STRUCT is used for "." and STRUCTOP_PTR for "->".
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They differ only in the error message given in case the value is
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not suitable or the structure component specified is not found.
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The length of the string follows the opcode, followed by
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BYTES_TO_EXP_ELEM(length) elements containing the data of the
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string, followed by the length again and the opcode again. */
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OP (STRUCTOP_STRUCT)
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OP (STRUCTOP_PTR)
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/* Anonymous field access, e.g. "foo.3". Used in Rust. */
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OP (STRUCTOP_ANONYMOUS)
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/* C++: OP_THIS is just a placeholder for the class instance variable.
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It just comes in a tight (OP_THIS, OP_THIS) pair. */
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OP (OP_THIS)
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/* Objective C: "@selector" pseudo-operator. */
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OP (OP_OBJC_SELECTOR)
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/* OP_SCOPE surrounds a type name and a field name. The type
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name is encoded as one element, but the field name stays as
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a string, which, of course, is variable length. */
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OP (OP_SCOPE)
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/* OP_FUNC_STATIC_VAR refers to a function local static variable. The
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function is taken from the following subexpression. The length of
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the variable name as a string follows the opcode, followed by
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BYTES_TO_EXP_ELEM(length) elements containing the data of the
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string, followed by the length again and the opcode again.
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Note this is used by C++, but not C. The C parser handles local
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static variables in the parser directly. Also, this is only used
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in C++ if the function/method name is not quoted, like e.g.:
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p S:method()::var
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p S:method() const::var
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If the function/method is quoted like instead:
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p 'S:method() const'::var
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then the C-specific handling directly in the parser takes over (see
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block/variable productions).
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Also, if the whole function+var is quoted like this:
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p 'S:method() const::var'
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then the whole quoted expression is interpreted as a single symbol
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name and we don't use OP_FUNC_STATIC_VAR either. In that case, the
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C++-specific symbol lookup routines take care of the
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function-local-static search. */
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OP (OP_FUNC_STATIC_VAR)
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/* OP_TYPE is for parsing types, and used with the "ptype" command
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so we can look up types that are qualified by scope, either with
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the GDB "::" operator, or the Modula-2 '.' operator. */
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OP (OP_TYPE)
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/* An un-looked-up identifier. */
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OP (OP_NAME)
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/* An Objective C Foundation Class NSString constant. */
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OP (OP_OBJC_NSSTRING)
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/* An array range operator (in Fortran 90, for "exp:exp", "exp:",
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":exp" and ":"). */
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OP (OP_RANGE)
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/* OP_ADL_FUNC specifies that the function is to be looked up in an
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Argument Dependent manner (Koenig lookup). */
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OP (OP_ADL_FUNC)
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/* The typeof operator. This has one expression argument, which is
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evaluated solely for its type. */
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OP (OP_TYPEOF)
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/* The decltype operator. This has one expression argument, which is
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evaluated solely for its type. This is similar to typeof, but has
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slight different semantics. */
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OP (OP_DECLTYPE)
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/* The typeid operator. This has one expression argument. */
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OP (OP_TYPEID)
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/* This is used for the Rust [expr; N] form of array construction. It
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takes two expression arguments. */
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OP (OP_RUST_ARRAY)
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/* First extension operator. Some language modules define extra
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operators below with numbers higher than OP_EXTENDED0. */
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OP (OP_EXTENDED0)
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/* ================ Ada operators ================ */
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/* X IN A'RANGE(N). N is an immediate operand, surrounded by
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BINOP_IN_BOUNDS before and after. A is an array, X an index
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value. Evaluates to true iff X is within range of the Nth
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dimension (1-based) of A. (A multi-dimensional array
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type is represented as array of array of ...) */
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OP (BINOP_IN_BOUNDS)
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/* X IN L .. U. True iff L <= X <= U. */
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OP (TERNOP_IN_RANGE)
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/* Ada attributes ('Foo). */
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OP (OP_ATR_FIRST)
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OP (OP_ATR_LAST)
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OP (OP_ATR_LENGTH)
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OP (OP_ATR_IMAGE)
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OP (OP_ATR_MAX)
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OP (OP_ATR_MIN)
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OP (OP_ATR_MODULUS)
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OP (OP_ATR_POS)
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OP (OP_ATR_SIZE)
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OP (OP_ATR_TAG)
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OP (OP_ATR_VAL)
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/* Ada type qualification. It is encoded as for UNOP_CAST, above,
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and denotes the TYPE'(EXPR) construct. */
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OP (UNOP_QUAL)
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/* X IN TYPE. The `TYPE' argument is immediate, with
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UNOP_IN_RANGE before and after it. True iff X is a member of
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type TYPE (typically a subrange). */
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OP (UNOP_IN_RANGE)
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/* An aggregate. A single immediate operand, N>0, gives
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the number of component specifications that follow. The
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immediate operand is followed by a second OP_AGGREGATE.
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Next come N component specifications. A component
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specification is either an OP_OTHERS (others=>...), an
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OP_CHOICES (for named associations), or other expression (for
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positional aggregates only). Aggregates currently
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occur only as the right sides of assignments. */
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OP (OP_AGGREGATE)
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/* An others clause. Followed by a single expression. */
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OP (OP_OTHERS)
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/* An aggregate component association. A single immediate operand, N,
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gives the number of choices that follow. This is followed by a second
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OP_CHOICES operator. Next come N operands, each of which is an
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expression, an OP_DISCRETE_RANGE, or an OP_NAME---the latter
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for a simple name that must be a record component name and does
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not correspond to a single existing symbol. After the N choice
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indicators comes an expression giving the value.
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In an aggregate such as (X => E1, ...), where X is a simple
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name, X could syntactically be either a component_selector_name
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or an expression used as a discrete_choice, depending on the
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aggregate's type context. Since this is not known at parsing
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time, we don't attempt to disambiguate X if it has multiple
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definitions, but instead supply an OP_NAME. If X has a single
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definition, we represent it with an OP_VAR_VALUE, even though
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it may turn out to be within a record aggregate. Aggregate
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evaluation can use either OP_NAMEs or OP_VAR_VALUEs to get a
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record field name, and can evaluate OP_VAR_VALUE normally to
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get its value as an expression. Unfortunately, we lose out in
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cases where X has multiple meanings and is part of an array
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aggregate. I hope these are not common enough to annoy users,
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who can work around the problem in any case by putting
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parentheses around X. */
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OP (OP_CHOICES)
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/* A positional aggregate component association. The operator is
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followed by a single integer indicating the position in the
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aggregate (0-based), followed by a second OP_POSITIONAL. Next
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follows a single expression giving the component value. */
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OP (OP_POSITIONAL)
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/* A range of values. Followed by two expressions giving the
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upper and lower bounds of the range. */
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OP (OP_DISCRETE_RANGE)
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/* ================ Fortran operators ================ */
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/* This is EXACTLY like OP_FUNCALL but is semantically different.
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In F77, array subscript expressions, substring expressions and
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function calls are all exactly the same syntactically. They
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may only be disambiguated at runtime. Thus this operator,
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which indicates that we have found something of the form
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<name> ( <stuff> ). */
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OP (OP_F77_UNDETERMINED_ARGLIST)
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/* Single operand builtins. */
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OP (UNOP_FORTRAN_KIND)
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OP (UNOP_FORTRAN_FLOOR)
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OP (UNOP_FORTRAN_CEILING)
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/* Two operand builtins. */
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OP (BINOP_FORTRAN_CMPLX)
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OP (BINOP_FORTRAN_MODULO)
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