DWARF Support for SIMD/SIMT

As part of its project to improve debugging on heterogeneous architectures, AMD has proposed a number of DWARF changes. The first of these proposals, to Allow Location Descriptions on the Stack, makes some sweeping changes to the DWARF-5 specification. The documents here are an attempt to split this into several more manageable proposals, in a form acceptable to the DWARF committee.

Issues ready to submit to DWARF committee:

• Expression Evaluation Context (Issue 241011.1)
• Locations on the Stack (Issue 230524.1)
• Clarifications for Memory Location Descriptions (Issue 230120.3)
• Clarifications for Location Descriptions (Issue 230120.2)
• General Support for Address Spaces (Original text)

Issues in progress:

• DWARF Operations to Create Vector Composite Location Descriptions
• DWARF Operation to Create Runtime Overlay Composite Location Description
• DWARF Operation to Access Call Frame Entry Registers
• Support for Source Language Optimizations that Result in Concurrent Iteration Execution
• Support for Divergent Control Flow of SIMT Hardware
• Support for Source Language Memory Spaces

Clarifications and editorial reorganization:

• Clarifications for Expression Evaluation
• Clarifications for CFI

Issues superseded by others:

• Editorial Reorganization (Included in Locations on the Stack)
• Generalize Offsetting of Location Descriptions (Included in Locations on the Stack)
• Generalize Creation of Undefined Location Descriptions (Included in Locations on the Stack)
• Generalize Creation of Composite Location Descriptions (Replaced by DW_OP_composite in Locations on the Stack)

Independent issues not part of this series:

• Clarifications for DW_OP_entry_value