Document revision date: 19 July 1999

Appendix B
Appendix B	Alpha Object Language
B.1	Object Language Overview
B.2	Module Header Records (EOBJ$C_EMH)
B.2.1	Main Module Header Record (EMH$C_MHD)
B.2.2	Language Processor Name Header Record (EMH$C_LNM)
B.2.3	Source Files Header Record (EMH$C_SRC)
B.2.4	Title Text Header Record (EMH$C_TTL)
B.3	Global Symbol Directory Records (EOBJ$C_EGSD)
B.3.1	Program Section Definition Subrecords (EGSD$C_PSC, EGSD$C_SPSC)
B.3.1.1	Normal Program Section Definition Subrecord (EGSD$C_PSC)
B.3.1.2	Program-Section-Definition-in-Shareable-Image Subrecord (GSD$C_SPSC)
B.3.1.3	Standard Program Section Names and Attributes
B.3.2	Global Symbol Specification Subrecords (EGSD$C_SYM, EGSD$C_SYMG)
B.3.2.1	GSD Subrecord for a Global Symbol Definition (EGSD$C_SYM with EGSY$V_DEF Set)
B.3.2.2	GSD Subrecord for a Universal Symbol Definition (EGSD$C_SYMG)
B.3.2.3	GSD Subrecord for a Symbol Reference
B.3.3	Entity-Ident-Consistency-Check Subrecord (EGSD$C_IDC)
B.3.4	GSD Subrecords Reserved to the OpenVMS Operating System (EGSD$C_SYMV, EGSD$C_SYMM)
B.3.4.1	Vectored-Symbol-Definition Subrecord (EGSD$C_SYMV)
B.3.4.2	Symbol-Definition-with-Version-Mask Subrecord (EGSD$C_SYMM)
B.4	Text Information and Relocation Records (EOBJ$C_ETIR)
B.4.1	Stack Commands
B.4.2	Store Commands
B.4.3	Operator Commands
B.4.4	Control Commands
B.4.5	Conditional Store Commands
B.4.5.1	Defining Conditional Linkage with Address-Related Commands
B.4.5.2	Optimizing Instructions with Instruction-Related Commands
B.4.5.2.1	Calculating JSR Hints
B.5	End-of-Module Record (EOBJ$C_EEOM)
B.6	Debugger Information Records (EOBJ$C_EDBG)
B.7	Traceback Information Records (EOBJ$C_ETBT)
Index
Index
Examples
1-1	Hello World! Program (HELLO.C)
1-2	Sample Linker Options File
2-1	Module Containing a Symbolic Reference: my_main.c
2-2	Module Containing a Symbol Definition: my_math.c
3-1	Sample Program MYTEST.C
3-2	Sample Program MYADD.C
3-3	Sample Program MYSUB.C
3-4	Program Sections Generated by Example 3-1
3-5	Linking Examples 3-1, 3-2, and 3-3
3-6	Image Section Information in a Map File
3-7	Program Section Information in a Map File (VAX Example)
3-8	Image Section Descriptions in an ANALYZE/IMAGE Display
3-9	Image Section Synopsis of Second Link
4-1	Shareable Image Test Module: my_main.c
4-2	Shareable Image: my_math.c
4-3	Transfer Vector for the Shareable Image MY_MATH.EXE
Figures
1-1	Position of the Linker in Program Development
2-1	Symbol Vector Contents
2-2	Symbol Resolution
2-3	Clusters Created for Sample Link
2-4	Linker Processing of Default Libraries and SYS$BASE_IMAGE.EXE
3-1	Communication of Image Memory Requirements
3-2	Program Sections Created for Examples 3-1, 3-2, and 3-3
3-3	Combining Program Sections into Image Sections
4-1	Comparison of UNIVERSAL = Option and Transfer Vectors
4-2	Accessing Universal Symbols Specified Using the SYMBOL_VECTOR = Option
A-1	Order of Records in an Object Module
A-2	GSD Record with Multiple Subrecords
B-1	Order of Records in an Object Module
B-2	Module Header Record with Subrecords
B-3	GSD Subrecord for a Program Section Definition
B-4	GSD Subrecord for a Shareable Image Program Section Definition
B-5	GSD Subrecord for a Global Symbol Definition (Data)
B-6	GSD Subrecord for a Global Symbol Definition (Procedure)
B-7	GSD Subrecords for Universal Data Definition
B-8	GSD Subrecord for a Universal Procedure Definition
B-9	GSD Subrecord for a Global Symbol Reference (EGSD$C_SYM with EGSY$V_DEF Clear)
B-10	GSD Subrecord for an Entity Ident Consistency Check
B-11	Optimization of a Standard Call
B-12	Calculating a Hint to a Shareable Image
B-13	End-of-Module Record
Tables
1-1	Input Files Accepted by the Linker
1-2	Output Files Generated by the Linker
1-3	Linker Qualifiers
1-4	Linker Options
1-5	Logical Names for Cross-Architecture Linking
2-1	Linker Input File Processing
2-2	Linker Input File Cluster Processing
3-1	Program Section Attributes
3-2	Mapping Program Section Attributes to Image Section Attributes for Executable Images
3-3	Mapping Program Section Attributes to Image Section Attributes for Shareable Images
3-4	Significant Attributes of Program Sections in MYSUB_CLUS Cluster
3-5	Image Section Attributes
4-1	Linker Qualifiers and Options Used to Create Shareable Images
5-1	LINK Command Map File Qualifiers
5-2	Image Map Sections
5-3	Symbol Characterization Codes
A-1	Types of GSD Subrecords
A-2	Alignment Field Values
A-3	Stack Commands
A-4	Store Commands
A-5	Operator Commands
A-6	Control Commands
B-1	Object Record Types
B-2	Relationships of Structures in the Alpha Object Language
B-3	Key to Structure Prefixes
B-4	Module Header Subrecords
B-5	Types of GSD Subrecords
B-6	Alignment Field Values
B-7	Standard Program Sections
B-8	Stack Commands
B-9	Store Commands
B-10	Operator Commands
B-11	Control Commands
B-12	Summary of Store Conditional Commands for Linkage
B-13	Contents of Linkage When Symbol Is Local to the Image
B-14	Contents of Linkage When Symbol Is External to the Image
B-15	Summary of Store Conditional Commands for Instruction Replacement

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