External symbol dictionary entries

For each section, class, part, entry, external symbol, and dummy external control section, the assembler keeps a record of the following external symbol dictionary (ESD) information:

Symbolic name, if one is specified
Type code
Individual identification number (ESDID)
Starting address
Length
Owning ESDID, if any
Symbol attributes
Alias, if one is specified

Table 1 lists the assembler instructions that define control sections and dummy control sections, classes and parts, or identify entry and external symbols, and tells their associated type codes. You can define up to 65535 individual control sections and external symbols in a source module if the NOGOFF option is specified, or up to 999999 external symbols if the GOFF option is specified.

Table 1. Defining external symbols
Name Entry	Instruction	Coding Entered into External Symbol Dictionary
		NOGOFF option	GOFF option
If present If omitted Instruction- dependent	START, CSECT, or RSECT START, CSECT, or RSECT Any instruction that initiates the unnamed section	SD PC PC	SD, ED, LD SD,ED SD
If present If omitted Optional	COM COM DSECT	CM CM None	SD,ED,CM SD,ED None
Mandatory Mandatory Mandatory	DXD or external DSECT CATTR CATTR PART(name)	XD Not applicable Not applicable	XD ED PD
Not applicable Not applicable Not applicable Not applicable	ENTRY EXTRN DC (V-type address constant) WXTRN	LD ER ER WX	LD ER ER WX

See the appendix "Object Deck Output" in the HLASM Programmer's Guide for details about the ESD entries produced when you specify the NOGOFF assembler option.

z/VM and z/OS: Refer to , SA22-7644 for details about the ESD entries produced when you specify the GOFF assembler option.