HLASM: V1R6 Language Ref

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Levels of macro call nestingCOMPAT(SYSLIST) Assembler Option: If the COMPAT(SYSLIST) assembler optionis specified, and a symbolic parameter is only a part of the value specified in aninner macro instruction operand, only the character string value given to theparameter by an outer call is passed through the nesting level. Inner sublist entriesare, therefore, not available for reference in the inner macro.▌2▐MACRO ┌────┴────┐OUTER &P1,&P2,&P3...INNER &P1,&P2,&P3. └────┬────┘. ▌1▐.MENDMACROINNER &Q,&R,&S.. ┐L 3,&Q(1) │A 3,&Q(2) ├ ▌4▐ST 3,&Q(3) │. ┘.MVC &R,&S..MEND────────────────────────────────────────────────────────────────START 0. ▌5▐. ┌──┴──┐OUTER (AREA,F200,SUM),TO,FROM¹. └──────┬──────┘. ▌3▐.+ L 3,AREA+ A 2,F200+ ST 3,SUM..+ MVC TO,FROM..ENDNotes:1. The following inner macro call statement is generated, but not listed unless thePCONTROL(MCALL) option is specified, or the assembler instruction ACONTROLMCALL is active:INNER (AREA,F200,SUM),TO,FROMFigure 35. Passing values through nesting levelsSystem variable symbols in nested macrosThe fixed global-scope system variable symbols (see “System variable symbols” onpage 259) are not affected by the nesting of macros. The variable global-scopesystem variable symbols have values which may change during the expansion of amacro definition. The following system variable is influenced by nested macros:312 HLASM: V1R6 Language Ref
Levels of macro call nesting&SYSM_SEV Provides the highest MNOTE severity code from the nested macromost recently called.The local system variable symbols are given read-only values each time a macrodefinition is called.The following system variable symbols can be affected by the position of a macroinstruction in code or the operand value specified in the macro instruction:&SYSCLOCK The assembler assigns &SYSCLOCK the constant string valuerepresenting the TOD clock value at the time at which a macro callis made. The time portion of this value is precise to themicrosecond. For any inner macro call, the value assigned to&SYSCLOCK differs from that of its parent.&SYSECT The assembler gives &SYSECT the character string value of thename of the control section in use at the point at which a macrocall is made. For a macro definition called by an inner macro call,the assembler assigns to &SYSECT the name of the control sectionin effect in the macro definition that contains the inner macro call,at the time the inner macro is called.If no control section is generated within a macro definition, thevalue assigned to &SYSECT does not change. It is the same for thenext level of macro definition called by an inner macro instruction.&SYSLIB_DSN, &SYSLIB_MEMBER, &SYSLIB_VOLUMEThe assembler assigns the character string value of the &SYSLIBsystem variable symbols at the point at which a macro is called.For an inner macro call whose definition is from a library member,these values may differ, if this is the first time this macro isinvoked.&SYSLIST If &SYSLIST is specified in a macro definition called by an innermacro instruction, &SYSLIST refers to the positional operands ofthe inner macro instruction.&SYSLOC The assembler gives &SYSLOC the character string value of thename of the location counter in use at the point at which a macrois called. For a macro definition called by an inner macro call, theassembler assigns to &SYSLOC the name of the location counter ineffect in the macro definition that contains the inner macro call. Ifno LOCTR or control section is generated within a macrodefinition, the value assigned to &SYSLOC does not change. It isthe same for the next level of macro definition called by an innermacro instruction.&SYSNDX The assembler increments &SYSNDX by one each time itencounters a macro call. It retains the incremented valuethroughout the expansion of the macro definition called, that is,within the local scope of the nesting level.&SYSNEST The assembler increments &SYSNEST by one each time itencounters a nested macro instruction. It retains the incrementedvalue within the local scope of the macro definition called by theinner macro instruction. Subsequent nested macro instructionscause &SYSNEST to be incremented by 1. When the assemblerexits from a nested macro it decreases the value in &SYSNEST by1.Chapter 8. How to write macro instructions 313
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High Level Assembler for z/OS & z/V
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Note!Before using this information
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|Open code . . . . . . . . . . . .
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Programming interface informationOr
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IBM High Level Assembler for z/OS &
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Syntax notationFormat▌A▐ ▌B
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Double-byte character set notationx
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Summary of changesxvi HLASM: V1R6 L
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Chapter 1. IntroductionA computer c
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Assembler languagev Macro instructi
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Assembler programProcessingConditio
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Coding made easierCoding made easie
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Chapter 2. Coding and structureThis
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Character setTable 4. Examples usin
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Assembler language coding conventio
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Assembler language structureThe mac
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Assembler language structureMachine
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Assembler language structureConditi
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Mnemonic tags|||||||||For example,
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Terms, literals, and expressions- T
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Terms, literals, and expressionsAss
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Terms, literals, and expressionsUsi
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Terms, literals, and expressions|||
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Terms, literals, and expressionsz/V
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Terms, literals, and expressionsTab
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Terms, literals, and expressions1.
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Terms, literals, and expressions1.
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Terms, literals, and expressions┌
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Terms, literals, and expressionsA-Y
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Chapter 3. Program structures and a
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SourcemoduleA source module is comp
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Beginning of a source modulev The S
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Beginning of a source moduleReferen
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Beginning of a source moduleNote: T
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Beginning of a source moduleClass l
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Beginning of a source modulez/VM an
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AddressingBase Address Definition:
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QualifiedDependentaddressingQualifi
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Addressingz/VM and z/OSWhen you spe
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Addressing..EX_SYM DC V(EXMOD1) Add
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AddressingSee the appendix “Objec
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Part 2. Machine and assembler instr
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Chapter 4. Machine instruction stat
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Input/output operationsThe input or
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Branching with extended mnemonic co
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Statement formatsSymbolic operation
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Operand entriesRegistersYou can spe
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Operand entriesv Explicitly—in a
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Operand entriesImmediateused by the
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Examples of coded machine instructi
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Chapter 5. Assembler instruction st
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*PROCESS statementstatement, follow
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ACONTROL instruction►►NOCOMPAT,
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ACONTROL instructionFLAG(PAGE0)inst
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ACONTROL instruction|||may be fetch
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AINSERT instruction►►sequence_s
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ALIAS instruction||||||The alias_st
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AMODE instructionCATTR instruction
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CATTR instructionRMODE(ANY)The text
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CCW and CCW0 instructionssupport 31
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CEJECT instructionIf number of line
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CNOP instructionAfter the BALR inst
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COPY instructioncopied from either
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CSECT instructionsame section name
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CXD instructionZETA: the resulting
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DC instruction10EBP(7)L2’12’the
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DC instructionTable 17. Length attr
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DC instruction4. Double-byte data i
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DC instructionTable 19. Type codes
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DC instructionYou may omit the modi
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DC instructionfirst constant to be
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DC instructionTable 21. Specifying
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DC instruction—Character constant
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DC instruction—Character constant
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DC instruction—Graphic constantTa
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DC instruction—Fixed-point consta
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DC instruction—Fixed-point consta
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DC instruction—Decimal constantsD
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DC instruction—Address constants|
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DC instruction—Address constantsT
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DC instruction—Offset constantIn
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DC instruction—Hexadecimal floati
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DC instruction—Decimal floating-p
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Syntax of binary, decimal, and hexa
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DC instruction—Binary floating-po
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DROP instructionLabeledDependentIf
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DS instructionv An ordinary symbolv
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DS instructionthe data that follows
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DSECT instructionTo effect referenc
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DXD instructionnominal_valueis the
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END instructionNotes:1. If the END
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EQU instruction||||to the symbol in
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EQU instruction|FPR Register - Floa
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EXITCTL instructionSee the section
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ISEQ instruction►►sequence_symb
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LOCTR instructionA LOCTR name may b
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LTORG instructionAddressingDuplicat
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MNOTE instructionNote: The maximum
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OPSYN instruction||||||v An operati
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ORG instruction||||||||If symbol de
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ORG instructionThat is, the ORG ins
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PRINT instructionPRINT instructionT
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PRINT instructionexceeded the macro
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PUNCH instructionv A pair of single
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REPRO instruction||Notes:1. The ide
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RSECT instructionThe beginning of a
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TITLE instructionv Provides heading
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TITLE instructionIf the TITLE state
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USING instructioninstructions suppo
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USING instructionby means of anothe
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USING instructionLabeled USING inst
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USING instructionDomain of a labele
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USING instructionIf the dependent U
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XATTR instructionXATTR instruction
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XATTR instructionSCOPE(MODULE), abb
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232 HLASM: V1R6 Language Ref
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Name entry . . . . . . . . . . . .
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Macro definitionA macro definition
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Macro instructionThe macro instruct
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Where to define a macro in a source
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Prototype statement|||||specified o
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Model statementsEach field or subfi
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Model statementsTable 37. Rules for
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Model statements||v Variable symbol
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Symbolic parametersPositionalKeywor
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Other conditional assembly instruct
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AREAD instruction||If no operand is
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MEXIT instructionThe MEXIT instruct
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System variable symbols1 macro2 get
Page 280 and 281: &SYSADATA_MEMBER System Variable Sy
Page 282 and 283: &SYSDATC System Variable SymbolYYYY
Page 284 and 285: &SYSECT System Variable Symbolv Sta
Page 286 and 287: &SYSIN_MEMBER System Variable Symbo
Page 288 and 289: &SYSLIB_DSN System Variable SymbolS
Page 290 and 291: &SYSLIN_DSN System Variable SymbolE
Page 292 and 293: &SYSLIST System Variable Symbolposi
Page 294 and 295: &SYSLOC System Variable Symbolinstr
Page 296 and 297: &SYSNDX System Variable Symbol1 MAC
Page 298 and 299: &SYSNDX System Variable SymbolState
Page 300 and 301: &SYSOPT_RENT System Variable Symbol
Page 302 and 303: &SYSPRINT_DSN System Variable Symbo
Page 304 and 305: &SYSPUNCH_DSN System Variable Symbo
Page 306 and 307: &SYSSEQF System Variable Symbol1. I
Page 308 and 309: &SYSTEM_ID System Variable SymbolNo
Page 310 and 311: &SYSTERM_VOLUME System Variable Sym
Page 312 and 313: &SYSVER System Variable Symbol294 H
Page 314 and 315: Macro instruction format|name_entry
Page 316 and 317: Macro instruction formatOperandYou
Page 318 and 319: Macro instruction formatAny keyword
Page 320 and 321: Macro instruction formatparameters
Page 322 and 323: Sublists in operandsTable 48. Relat
Page 324 and 325: Values in operandsUnquotedSpecial2.
Page 326 and 327: Values in operands’SPACES ALLOWED
Page 328 and 329: Levels of macro call nestingLevels
Page 332 and 333: Levels of macro call nesting&SYSSEQ
Page 334 and 335: SET symbolsSET symbolsSET symbols a
Page 336 and 337: SET symbolsTable 50. Features of SE
Page 338 and 339: SET symbolspreceding 999999 element
Page 340 and 341: Data attributesTable 51. Data attri
Page 342 and 343: Data attributesThe values of attrib
Page 344 and 345: Data attributesV R-, V-type address
Page 346 and 347: Data attributes|||||||||Notes:1. Or
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Page 350 and 351: Data attributesCount attribute (K')
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Page 354 and 355: Sequence symbolsparameter wherever
Page 356 and 357: LookaheadSequencelater defined by O
Page 358 and 359: GBLA, GBLB, and GBLC instructionsGB
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Page 362 and 363: Assigning values to SET symbolsLogi
Page 364 and 365: Assigning values to SET symbolsTabl
Page 366 and 367: SETA instructionTable 58. Variable
Page 368 and 369: SETA instructionB2A(’’) has val
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Page 372 and 373: SETA instructionAfter the following
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SETB instructionOR Format: Logical-
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SETC instructionSETCinstructionThe
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SETC instruction|LCLC &C1,&C2LCLC &
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Substring notationv When e2 has a v
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Substring notation||||ExamplesA2D(0
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Substring notationC2X Format: Funct
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Substring notationSuppose the SETC
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Substring notationX2C(’’) has v
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Substring notationFor example, eith
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Substring notationStatement 1 assig
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SETAF instruction►► variable_sy
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AIF instructionsequence_symbolis a
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AIF instructionAIFB—synonym of th
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ACTR instruction►►sequence_symb
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MHELP optionsparameters are dumped
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Assembler instructions and statemen
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Summary of constantsTable 65. Summa
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Macro and conditional assembly lang
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Standard character set code tableHe
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Standard character set code tableHe
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NoticesPURPOSE. Some states do not
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z/VM: CP Planning and Administratio
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ALIAS instruction 108maximum operan
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comment statements (continued)ordin
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GG-type graphic constant 144GBLA in
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macro instructions (continued)opera
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eference constant (R) 154reference
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UUHEADPRINT instruction 206unary op
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