HP Fortran Programmer's Reference

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HP Fortran statements POINTER (Cray-style extension) 392 Pointees that are arrays with nonconstant bounds can be used only in subroutines and functions,notinmainprograms. Variables used in an array-bound expression that appears in a POINTER statement must be either subprogram formal arguments or common block variables. The value of the expression cannot change after subprogram entry. You associate memory with a pointer by assigning it the address of an object. Typically, this is done with the libU77 function, LOC. TheLOC function returns the address of its argument, which can be assigned to a pointer. The following example assigns 0 to the pointee i: INTEGER i, j POINTER (p, i) p = LOC(j) j = 0 You can also use the MALLOC intrinsic to allocate memory from the heap and assign its return value to a pointer. Once you are done with the allocated memory, you should use the FREE intrinsic to release the memory so that it is available for reuse. If you are using the pointer to manipulate a device that resides at a fixed address, you can assign the address to the pointer, using either an integer constant or integer expression. Under certain circumstances, Cray-style pointers can cause erratic program behavior—especially if the program has been optimized. To ensure correct behavior, observe the following: Subroutines and functions must not save the address of any of their arguments between calls. A function must not return the address of any of its arguments. Only those variables whose addresses are explicitly taken with the LOC function must be referenced through a pointer. Examples In the following example, the intrinsic MALLOC returns either the address of the block of memory it allocated or 0 if MALLOC was unable to allocate enough memory. The formal argument nelem contains the number of array elements and is multiplied by 4 to obtain the number of bytes that MALLOC is to allocate. The FREE intrinsic returns memory to the heap for reuse. SUBROUTINE print_iarr(nelem) POINTER (p, iarr(nelem)) p = MALLOC( 4*nelem ) Chapter 10
IF (p.EQ.0) THEN PRINT *, 'MALLOC failed.' ELSE DO i = 1,nelem iarr(i) = i END DO PRINT *, (iarr(i),i=1,nelem) CALL FREE( p ) ENDIF RETURN END SUBROUTINE print_iarr Related statements POINTER (standard Fortran 90) Related concepts For related information, see the following: “Pointers” on page 49 The description of the LOC routine in Table 12-3 HP Fortran statements POINTER (Cray-style extension) The descriptions of the MALLOC and FREE intrinsics in Chapter 11, “Intrinsic procedures,” on page 467 Chapter 10 393
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HP Fortran Programmer’s Reference
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Notice Copyright 1979-2003 Hewlett-
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Contents vi Structurecomponent ....
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Contents viii INTENTattribute......
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Contents x ASSIGN .................
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Contents xii RECORD (extension) ...
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Contents xiv CSHIFT(ARRAY,SHIFT,DIM
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Contents xvi LOC(X)................
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Contents xviii TRANSPOSE(MATRIX)...
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Tables Table9-10.D,E,F,andGeditdesc
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The HP Fortran Programmer’s Refer
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Notational conventions This section
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xxvi Either a or b must be supplied
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NOTE Many of these documents are ac
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Introduction to HP Fortran 2 Data t
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Introduction to HP Fortran HP Fortr
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Introduction to HP Fortran HP Fortr
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Language elements 8 Lexical tokens
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Language elements Lexical tokens Le
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Language elements Program structure
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Language elements Statements Statem
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Language elements Source format of
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Language elements INCLUDE line 22 C
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Data types and data objects 24 Deri
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Data types and data objects Intrins
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Data types and data objects Derived
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Data types and data objects Pointer
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Data types and data objects Pointer
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Arrays 54 Array declarations Array-
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Arrays Array fundamentals a(1,2) a(
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Arrays Array declarations For a giv
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Arrays Array declarations If a proc
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Arrays Array declarations Allocatab
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Arrays Array declarations subscript
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Arrays Array sections Array section
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Arrays Array sections ! The arrays
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Arrays Array-valued structure compo
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Arrays Array-valued structure compo
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Arrays Array constructors depends o
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Arrays Array expressions ! the effe
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Arrays Array-valued functions PROGR
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Arrays Array inquiry intrinsics 80
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Expressions and assignment 82 — O
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Expressions and assignment Expressi
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Expressions and assignment Assignme
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Execution control 104 Control const
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Execution control Control construct
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Execution control Flow control stat
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Program units and procedures 122 Te
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Program units and procedures Termin
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Program units and procedures Main p
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Program units and procedures Main p
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Program units and procedures Extern
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Program units and procedures Intern
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Program units and procedures Statem
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Program units and procedures Argume
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Program units and procedures Proced
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Program units and procedures Module
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Program units and procedures Block
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Program units and procedures Block
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I/O and file handling 170 Files Con
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I/O and file handling Files Files A
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I/O and file handling Connecting a
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I/O and file handling Connecting a
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I/O and file handling File access m
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I/O and file handling Nonadvancing
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I/O and file handling I/O statement
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I/O and file handling Syntax of I/O
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I/O and file handling Example progr
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I/O formatting transferring data be
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I/O formatting Format specification
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I/O formatting Edit descriptors Tab
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I/O formatting Edit descriptors del
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I/O formatting Edit descriptors A a
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I/O formatting Edit descriptors 216
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I/O formatting Edit descriptors Qed
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I/O formatting Edit descriptors O (
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I/O formatting Edit descriptors Inp
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I/O formatting Edit descriptors [r
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I/O formatting Embedded format spec
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I/O formatting Format specification
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HP Fortran statements The following
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HP Fortran statements Attributes Ta
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HP Fortran statements ACCEPT (exten
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HP Fortran statements ALLOCATABLE (
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HP Fortran statements ALLOCATE ALLO
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HP Fortran statements ALLOCATE The
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HP Fortran statements AUTOMATIC (ex
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HP Fortran statements BACKSPACE BAC
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HP Fortran statements BLOCK DATA BL
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HP Fortran statements BUFFER IN (ex
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HP Fortran statements BUFFER OUT (e
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HP Fortran statements BYTE (extensi
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HP Fortran statements CALL 4. Contr
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HP Fortran statements CASE low: For
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HP Fortran statements CHARACTER CHA
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HP Fortran statements CHARACTER 264
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HP Fortran statements CLOSE Descrip
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HP Fortran statements COMMON COMMON
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HP Fortran statements COMMON ! comm
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HP Fortran statements COMPLEX Descr
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HP Fortran statements CONTAINS CONT
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HP Fortran statements CONTINUE CONT
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HP Fortran statements CYCLE Related
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HP Fortran statements DATA 280 Proc
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HP Fortran statements DATA 282 “I
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HP Fortran statements DEALLOCATE Ex
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HP Fortran statements DECODE (exten
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HP Fortran statements DIMENSION (st
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HP Fortran statements DIMENSION (st
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HP Fortran statements DO DO Control
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HP Fortran statements DO DO i = 1,
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HP Fortran statements DOUBLE COMPLE
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HP Fortran statements DOUBLE PRECIS
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HP Fortran statements ELSE ELSE Pro
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HP Fortran statements ELSE IF Relat
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HP Fortran statements ENCODE (exten
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HP Fortran statements ENCODE (exten
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HP Fortran statements END Related s
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HP Fortran statements END (structur
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HP Fortran statements END TYPE END
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HP Fortran statements ENDFILE An en
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HP Fortran statements ENTRY 316 The
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HP Fortran statements ENTRY Here ar
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HP Fortran statements EQUIVALENCE T
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HP Fortran statements EQUIVALENCE C
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HP Fortran statements EXTERNAL (sta
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HP Fortran statements EXTERNAL (sta
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HP Fortran statements FORMAT Relate
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HP Fortran statements FUNCTION Desc
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HP Fortran statements GO TO (comput
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HP Fortran statements IF (arithmeti
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HP Fortran statements IF (logical)
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HP Fortran statements IMPLICIT The
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HP Fortran statements INCLUDE Examp
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HP Fortran statements TARGET (state
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HP Fortran statements TARGET (state
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HP Fortran statements TASK COMMON (
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HP Fortran statements TYPE (declara
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HP Fortran statements TYPE (definit
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HP Fortran statements TYPE (I/O) (e
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HP Fortran statements USE USE Provi
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HP Fortran statements VIRTUAL (exte
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HP Fortran statements WHERE (statem
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HP Fortran statements WHERE (statem
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HP Fortran statements WRITE WRITE O
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HP Fortran statements WRITE Descrip
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HP Fortran statements WRITE 466 Cha
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Intrinsic procedures The following
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Intrinsic procedures Basic terms an
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Intrinsic procedures Nonstandard in
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Intrinsic procedures Data represent
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Intrinsic procedures Functional cat
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Intrinsic procedures Functional cat
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Intrinsic procedures Intrinsic proc
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BLAS and libU77 libraries The libU7
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BLAS and libU77 libraries Calling l
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BLAS and libU77 libraries Calling l
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BLAS and libU77 libraries libU77 ro
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BLAS and libU77 libraries BLAS rout
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BLAS and libU77 libraries BLAS rout
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I/O runtime error messages INTEGER
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I/O runtime error messages Runtime
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Glossary association association Th
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Glossary construct construct Aserie
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Glossary High Performance Fortran (
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Glossary preconnected preconnected
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Glossary type type See data type. t
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Index arrays, 25 derived types, 45
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Index examples, 96 intrinsic, 95 ma
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Index DSYMV, 621 DSYR, 621 DSYR2, 6
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Index hidden length parameter, 146
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Index statement order, 14 continuat
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Index DFLOTI intrinsics function, 5
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Index in expressions, 93 initializa
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Index statement function, 137 when
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Index assigned GO TO, 115, 331 bloc
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Index HSHFT intrinsics function, 53
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Index PRINT, 397 READ, 406 REWIND,
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Index DATE, 504 date and time intri
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Index KNINT, 565 KNOT, 566 KPACK, 5
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Index ISAMAX routine, 620 ISATTY ro
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Index tape input/output routines, 6
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Index derived types, 450 DO loops,
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Index deallocating, 283 declaring,
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Index REAL statement, 411 type decl
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Index filename extensions, 16 fixed
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Index glossary, 643 modules, 317 st
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Index in expressions, 91, 93 triple
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Index Z Zeditdescriptor, 227 ZABS i
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