HLASM Language Reference

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Levels of Macro Call Nesting When the assembler processes a macro exit instruction, either MEXIT or MEND, it selects the next statement to process depending on the level of nesting. If the macro exit instruction is from an inner macro, the assembler processes the next statement after the statement that called the outer macro. The next statement in open code might come from the AINSERT buffer. If the macro exit instruction is from an outer macro, the assembler processes the next statement in open code, after the statement that called the inner macro. Passing Values through Nesting Levels The value contained in an outer macro instruction operand can be passed through one or more levels of nesting (see Figure 85 on page 315). However, the value specified (see ▌1▐ in Figure 85) in the inner macro instruction operand must be identical to the corresponding symbolic parameter (see ▌2▐ in Figure 85) declared in the prototype of the containing macro definition. Thus, a sublist can be passed (see ▌3▐ in Figure 85) and referred to (see ▌4▐ in Figure 85) as a sublist in the macro definition called by the inner macro call. Also, any symbol (see ▌5▐ in Figure 85) that is passed carries its attribute values through the nesting levels. If inner macro calls at each level are specified with symbolic parameters as operand values, values can be passed from open code through several levels of macro nesting. COMPAT(SYSLIST) Assembler Option: If the COMPAT(SYSLIST) assembler option is specified, and a symbolic parameter is only a part of the value specified in an inner macro instruction operand, only the character string value given to the parameter by an outer call is passed through the nesting level. Inner sublist entries are, therefore, not available for reference in the inner macro. 314 HLASM V1R5 Language Reference
Levels of Macro Call Nesting ▌2▐ MACRO ┌────┴────┐ OUTER &P1,&P2,&P3 . . . INNER &P1,&P2,&P3 . └────┬────┘ . ▌1▐ . MEND MACRO INNER &Q,&R,&S . . ┐ L 3,&Q(1) │ A 3,&Q(2) ├ ▌4▐ ST 3,&Q(3) │ . ┘ . MVC &R,&S . . MEND ──────────────────────────────────────────────────────────────── START . ▌5▐ . ┌──┴──┐ OUTER (AREA,F2,SUM),TO,FROM . └──────┬──────┘ . ▌3▐ . + L 3,AREA + A 2,F2 + ST 3,SUM . . + MVC TO,FROM . . END Notes: 1. The following inner macro call statement is generated, but not listed unless the PCONTROL(MCALL) option is specified, or the assembler instruction ACONTROL MCALL is active: INNER (AREA,F2,SUM),TO,FROM Figure 85. Passing Values Through Nesting Levels Chapter 8. How to Write Macro Instructions 315
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High Level Assembler for MVS & VM &
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Note! Before using this information
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Contents Source Module . . . . . .
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Contents Ordinary USING Instruction
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Contents Sublists in Operands . . .
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About this Manual This manual descr
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IBM High Level Assembler for MVS &
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| The Internet. You can access IBM
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▌C▐ The item referred to by ▌
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Miscellany The ASCII translation t
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Part 1. Assembler Language—Struct
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Language Compatibility Language Com
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Assembler Program Assembler Program
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Relationship of Assembler to Operat
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Coding Made Easier Linkage between
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Character Set Compatibility with Ea
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Assembler Language Coding Conventio
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Assembler Language Structure Condit
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Assembler Language Structure Machin
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Assembler Language Structure Condit
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Terms, Literals, and Expressions Te
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Terms, Literals, and Expressions -
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Terms, Literals, and Expressions As
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Terms, Literals, and Expressions Se
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Terms, Literals, and Expressions Fo
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Terms, Literals, and Expressions I
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Terms, Literals, and Expressions Th
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Terms, Literals, and Expressions 1.
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Terms, Literals, and Expressions
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Terms, Literals, and Expressions
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Terms, Literals, and Expressions Th
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| Chapter 3. Program Structures and
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Source Module A source module is co
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The CSECT instruction can be used a
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| in linker control statements for
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This is not only convenient, but it
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| SECT_A CSECT , Define section SEC
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| For executable sections, the loca
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Addressing | The System/390® and z
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Addressing | Parts must always be r
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Addressing Literal Pools ALPHA LR 3
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Addressing If the symbol is the nam
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Addressing External Symbol Dictiona
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Addressing 74 HLASM V1R5 Language R
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Part 2. Machine and Assembler Instr
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General Instructions Chapter 4. Mac
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Input/Output Operations For further
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Branching with Extended Mnemonic Co
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Symbolic Operation Codes variations
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Operand Entries Registers You can s
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Operand Entries “Program Structur
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Operand Entries Format │ Coded or
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Examples of Coded Machine Instructi
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Chapter 5. Assembler Instruction St
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*PROCESS Statement *PROCESS Stateme
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ACONTROL Instruction ►►──
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ACONTROL Instruction FLAG(PAGE0) in
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AINSERT Instruction character_strin
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AMODE Instruction alias_string is t
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CATTR Instruction Figure 25. AMODE/
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CATTR Instruction | statements for
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CCW1 Instruction data_count is an a
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CEJECT Instruction If symbol is an
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CNOP Instruction Figure 29 (Page 2
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COPY Instruction In the following e
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CSECT Instruction symbol in the nam
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DC Instruction ROUTINE B GAMMA DXD
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DC Instruction duplication_factor c
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DC Instruction Figure 33 (Page 2 of
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DC Instruction With EBCDIC spaces
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DC Instruction Further information
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DC Instruction | Symbols used in su
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DC Instruction The length attribute
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DC Instruction Notes: 1. Don't conf
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DC Instruction—Character Constant
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DC Instruction—Character Constant
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DC Instruction—Graphic Constant r
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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 Constants
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DC Instruction—Address Constants
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DC Instruction—Address Constants
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DC Instruction—Offset Constant re
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DC Instruction—Length Constant Le
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DC Instruction—Hexadecimal Floati
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DC Instruction—Binary Floating-Po
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DC Instruction—Binary Floating-Po
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DROP Instruction DROP Instruction T
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DS Instruction USING DSECTA,14 ALBL
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DS Instruction The size of a storag
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DSECT Instruction DSECT Instruction
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DXD Instruction ASEMBLY2 CSECT USIN
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END Instruction change but no addit
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EQU Instruction EQU Instruction The
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EQU Instruction 5. The length attri
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EXITCTL Instruction sequence_symbol
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ISEQ Instruction must be greater th
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LOCTR Instruction A CSECT , See not
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LTORG Instruction If symbol is an o
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MNOTE Instruction When two literals
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OPSYN Instruction ,ERROR, SEV 1 An
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ORG Instruction AFTER is defined in
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ORG Instruction If you specify mult
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POP Instruction POP Instruction The
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PRINT Instruction Note: If the next
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Process Statement Process Statement
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REPRO Instruction NOPRINT instructs
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RSECT Instruction 4. AMODE or RMODE
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START Instruction START Instruction
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TITLE Instruction The name value is
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USING Instruction Only the characte
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USING Instruction Base Registers fo
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USING Instruction If register 0 is
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USING Instruction A variable symbo
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USING Instruction In this MVC instr
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USING Instruction Range of a Depend
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XATTR Instruction external_symbol i
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XATTR Instruction SCOPE ►►─
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XATTR Instruction 234 HLASM V1R5 La
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Part 3. Macro Language &SYSDATC Sys
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Introduction to Macro Language Chap
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Introduction to Macro Language The
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Introduction to Macro Language Macr
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MACRO and MEND Statements The assem
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Prototype Statement Macros that are
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Model Statements generated from tha
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Model Statements ▌5▐ ▌6▐
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Model Statements Notes: 1. You can
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Positional Parameters Symbolic para
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Processing Statements Processing St
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AREAD Instruction Assign Local Time
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COPY Instruction sequence_symbol is
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System Variable Symbols System Vari
Page 284 and 285: &SYSADATA_MEMBER System Variable Sy
Page 286 and 287: &SYSCLOCK System Variable Symbol &S
Page 288 and 289: &SYSECT System Variable Symbol depe
Page 290 and 291: &SYSIN_MEMBER System Variable Symbo
Page 292 and 293: &SYSJOB System Variable Symbol &SYS
Page 294 and 295: &SYSLIN_DSN System Variable Symbol
Page 296 and 297: &SYSLIST System Variable Symbol The
Page 298 and 299: &SYSLOC System Variable Symbol To
Page 300 and 301: &SYSM_SEV System Variable Symbol &S
Page 302 and 303: &SYSNDX System Variable Symbol The
Page 304 and 305: &SYSOPT_DBCS System Variable Symbol
Page 306 and 307: &SYSPARM System Variable Symbol Not
Page 308 and 309: &SYSPRINT_MEMBER System Variable Sy
Page 310 and 311: &SYSPUNCH_MEMBER System Variable Sy
Page 312 and 313: &SYSSTEP System Variable Symbol Not
Page 314 and 315: &SYSTERM_DSN System Variable Symbol
Page 316 and 317: &SYSTIME System Variable Symbol Not
Page 318 and 319: Macro Instruction Format sequence_s
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Page 328 and 329: Values in Operands Notes: 1. Spaces
Page 330 and 331: Values in Operands Parentheses In m
Page 332 and 333: Inner and Outer Macro Instructions
Page 336 and 337: Levels of Macro Call Nesting System
Page 338 and 339: How to Write Conditional Assembly I
Page 340 and 341: SET Symbols SET Symbol Specificatio
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Page 344 and 345: Data Attributes this example indica
Page 346 and 347: Data Attributes variable_symbol is
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Page 354 and 355: Data Attributes The scale attribute
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Page 360 and 361: Lookahead MACRO &NAME MOVE &TO,&FRO
Page 362 and 363: Open Code Sequence Symbols The cond
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Page 366 and 367: LCLA, LCLB, and LCLC Instructions s
Page 368 and 369: SETA Instruction expression is an a
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SETB Instruction ┌─────
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SETB Instruction | ISDEC | Format:
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SETB Instruction The two comparands
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SETC Instruction Notes: 1. The asse
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Figure 103. Substring Notation in C
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Loc Object Code Addr1 Addr2 Stmt So
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| B2C('111111') has value '3' | B2C
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| Output: D2B('decstring') converts
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SIGNED Format: Logical-expression,
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| X2D('') has value '+' | X2D('91')
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Concatenation of strings containing
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MACRO &NAME MOVE &TO,&FROM LCLC &PR
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SETAF Instruction Alternative State
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Branching Branching You can control
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AGO Instruction The extended AIF in
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ACTR Instruction AGOB—Synonym of
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ANOP Instruction statement processe
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MHELP Instruction MHELP B'10000000'
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400 HLASM V1R5 Language Reference
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Assembler Instructions and Statemen
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Summary of Constants Figure 113. Su
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Macro and Conditional Assembly Lang
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Standard Character Set Code Table H
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Standard Character Set Code Table H
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Trademarks AIX BookMaster CICS DFSM
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Bibliography SMP/E Reference, SC28-
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Index A2C (SETC built-in function)
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Index B B-type binary constant 141
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Index conditional assembly instruct
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Index elements of conditional assem
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Index instructions (continued) asse
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Index machine instruction statement
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Index operands (continued) compatib
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Index relative addressing 67 reloca
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Index sublists compatibility with A
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Index variable symbols (continued)
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Readers' Comments High Level Assemb
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IBM® Program Number: 5696-234 Prin
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