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Contributors and Acknowledgments
-
Yaxun Liu, AMD
-
Brian Sumner, AMD
-
Ben Ashbaugh, Intel
-
Alexey Bader, Intel
-
Raun Krisch, Intel
-
John Kessenich, Google
-
David Neto, Google
-
Neil Henning, Codeplay
-
Kerch Holt, Nvidia
1. Introduction
This is the specification of DebugInfo extended instruction set.
The library is imported into a SPIR-V module in the following manner:
The instructions below are capable to convey debug information of the source program.
The design guide lines for these instructions are:
-
Sufficient for a backend to generate DWARF4 debug info for OpenCL C/C++ kernels
-
Easy translation between SPIR-V/LLVM
-
Clear
-
Concise
-
Extendable for other languages
-
Capable of representing debug information for optimized IR
2. Binary Form
This section contains the semantics of the debug info extended instructions
using the OpExtInst instruction.
All Name operands are id of OpString instruction, which represents the name
of the entry (type, variable, function. etc) as it appears in the source
program.
Result Type of all instructions bellow is id of OpTypeVoid
Set operand in all instructions bellow is the result of an OpExtInstImport
instruction.
All instructions in this extended set has no semantic impact and can be safely
removed from the module all at once. Or a single debugging instruction can be
removed from the module if all references, to the Result <id> of this
instruction are replaced with id of DebugInfoNone
instruction.
DebugScope, DebugNoScope,
DebugDeclare, DebugValue
instructions can interleave with instructions within a function body.
All other debugging instructions should be located between section 9
(All type declarations (OpTypeXXX instructions), all constant instructions, and
all global variable declarations …) and section 10 (All function declaration)
per the core SPIR-V specification.
Debug info for source language opaque types is represented by
DebugTypeComposite without Members operands.
Size of the composite must be DebugInfoNone and Name
must start with @ symbol to avoid clashes with user defined names.
3. Enumerations
3.1. Instruction Enumeration
Instruction number |
Instruction name |
---|---|
0 |
|
1 |
|
2 |
|
3 |
|
4 |
|
5 |
|
6 |
|
7 |
|
8 |
|
9 |
|
10 |
|
11 |
|
12 |
|
13 |
|
14 |
|
15 |
|
16 |
|
17 |
|
18 |
|
19 |
|
20 |
|
21 |
|
22 |
|
23 |
|
24 |
|
25 |
|
26 |
|
27 |
|
28 |
|
29 |
|
30 |
|
31 |
|
32 |
|
33 |
3.2. Debug Info Flags
Value | Flag Name |
---|---|
1 << 0 |
FlagIsProtected |
1 << 1 |
FlagIsPrivate |
1<<1 | 1<<0 |
FlagIsPublic |
1 << 2 |
FlagIsLocal |
1 << 3 |
FlagIsDefinition |
1 << 4 |
FlagFwdDecl |
1 << 5 |
FlagArtificial |
1 << 6 |
FlagExplicit |
1 << 7 |
FlagPrototyped |
1 << 8 |
FlagObjectPointer |
1 << 9 |
FlagStaticMember |
1 << 10 |
FlagIndirectVariable |
1 << 11 |
FlagLValueReference |
1 << 12 |
FlagRValueReference |
1 << 13 |
FlagIsOptimized |
3.3. Base Type Attribute Encodings
Used by DebugTypeBasic
Encoding code name | |
---|---|
0 |
Unspecified |
1 |
Address |
2 |
Boolean |
4 |
Float |
5 |
Signed |
6 |
SignedChar |
7 |
Unsigned |
8 |
UnsignedChar |
3.5. Type Qualifiers
Used by DebugTypeQualifier
Qualifier tag code name | |
---|---|
0 |
ConstType |
1 |
VolatileType |
2 |
RestrictType |
3.6. Debug Operations
Used by DebugExpression
Operation encodings | No. of Operands | |
---|---|---|
0 |
Deref |
0 |
1 |
Plus |
0 |
2 |
Minus |
0 |
3 |
PlusUconst |
1 |
4 |
BitPiece |
2 |
5 |
Swap |
0 |
6 |
Xderef |
0 |
7 |
StackValue |
0 |
8 |
Constu |
1 |
4. Instructions
4.1. Absent Debugging Information
4.2. Compilation Unit
4.3. Type instructions
DebugTypeBasic |
||||||||
8 |
12 |
<id> |
Result <id> |
<id> Set |
2 |
<id> Name |
<id> Size |
DebugTypePointer |
||||||||
8 |
12 |
<id> |
Result <id> |
<id> Set |
3 |
<id> Base Type |
Storage Class |
Literal Flags |
DebugTypeQualifier |
|||||||
7 |
12 |
<id> |
Result <id> |
<id> Set |
4 |
<id> Base Type |
DebugTypeEnum |
||||||||||||||
13+ |
12 |
<id> |
Result <id> |
<id> Set |
9 |
<id> Name |
<id> Underlying Type |
<id> Source |
Literal Number Line |
Literal Number Column |
<id>, Parent |
<id> Size |
Literal Flags |
<id> Value, |
DebugTypeComposite Note: To represent a source language opaque type this instruction must have no Members operands, Size operand must be DebugInfoNone and Name must start with @ symbol to avoid clashes with user defined names. |
||||||||||||||
13+ |
12 |
<id> |
Result <id> |
<id> Set |
10 |
<id> Name |
<id> Source |
Literal Number Line |
Literal Number Column |
<id> Parent |
<id> Size |
Literal Flags |
<id>, <id>, … Members |
DebugTypeMember |
|||||||||||||||
14+ |
12 |
<id> |
Result <id> |
<id> Set |
11 |
<id> Name |
<id> Type |
<id> Source |
Literal Number Line |
Literal Number Column |
<id> Parent |
<id> Offset |
<id> Size |
Optional <id> Value |
DebugTypeInheritance |
||||||||||
10 |
12 |
<id> |
Result <id> |
<id> Set |
12 |
<id> Child |
<id> Parent |
<id> Offset |
<id> Size |
4.4. Templates
DebugTypeTemplateParameterPack |
||||||||||
10+ |
12 |
<id> |
Result <id> |
<id> Set |
17 |
<id> Name |
<id> Source |
Literal Number Line |
Literal Number Column |
<id>… Template parameters |
4.5. Global Variables
DebugGlobalVariable |
|||||||||||||||
14+ |
12 |
<id> |
Result <id> |
<id> Set |
18 |
<id> Name |
<id> Type |
<id> Source |
Literal Number Line |
Literal Number Column |
<id> Parent |
<id> Linkage Name |
<id> Variable |
Optional <id> Static Member Declaration |
4.6. Functions
DebugFunctionDeclaration |
|||||||||||||
13 |
12 |
<id> |
Result <id> |
<id> Set |
19 |
<id> Name |
<id> Type |
<id> Source |
Literal Number Line |
Literal Number Column |
<id> Parent |
<id> Linkage Name |
DebugFunction |
||||||||||||||||
15+ |
12 |
<id> |
Result <id> |
<id> Set |
20 |
<id> Name |
<id> Type |
<id> Source |
Literal Number Line |
Literal Number Column |
<id> Parent |
<id> Linkage Name |
Literal Number Scope Line |
<id> Function |
Optional <id> Declaration |
4.7. Location Information
DebugLexicalBlock |
||||||||||
9+ |
12 |
<id> |
Result <id> |
<id> Set |
21 |
<id> Source |
Literal Number Line |
Literal Number Column |
<id> Parent |
Optional <id> Name |
DebugScope |
|||||||
6+ |
12 |
<id> |
Result <id> |
<id> Set |
23 |
<id> Scope |
Optional |
DebugNoScope |
|||||
5 |
12 |
<id> |
Result <id> |
<id> Set |
24 |
DebugInlinedAt |
||||||||
7+ |
12 |
<id> |
Result <id> |
<id> Set |
25 |
Literal Number Line |
<id> Scope |
Optional <id> Inlined |
4.8. Local Variables
DebugInlinedVariable |
|||||||
7+ |
12 |
<id> |
Result <id> |
<id> Set |
27 |
<id> Variable |
<id> Inlined |
DebugDeclare |
||||||||
8 |
12 |
<id> |
Result <id> |
<id> Set |
28 |
<id> Local Variable |
<id> Variable |
<id> Expression |
DebugValue |
|||||||||
8+ |
12 |
<id> |
Result <id> |
<id> Set |
29 |
<id> Local Variable |
<id> Value |
<id> Expression |
<id>, <id>, … Indexes |
DebugOperation |
|||||||
6+ |
12 |
<id> |
Result <id> |
<id> Set |
30 |
Optional Literal Operands … |
DebugExpression |
||||||
5+ |
12 |
<id> |
Result <id> |
<id> Set |
31 |
Optional <id>… Operation |
4.9. Macros
DebugMacroUndef |
||||||||
8 |
12 |
<id> |
Result <id> |
<id> Set |
33 |
<id> Source |
Literal Number Line |
<id> Macro |
5. Validation Rules
None.
6. Issues
-
Does the ABI used for the OpenCL C 2.0 blocks feature have to be declared somewhere else in the module?
RESOLVED: No. Block ABI is out of scope for this specification.
7. Revision History
Rev | Date | Author | Changes |
---|---|---|---|
0.99 Rev 1 |
2016-11-25 |
Alexey Sotkin |
Initial revision |
0.99 Rev 2 |
2016-12-08 |
Alexey Sotkin |
Added details for the type instructions |
0.99 Rev 3 |
2016-12-14 |
Alexey Sotkin |
Added details for the rest of instructions |
0.99 Rev 4 |
2016-12-21 |
Alexey Sotkin |
Applied comments after review |
0.99 Rev 5 |
2017-03-22 |
Alexey Sotkin |
Format the specification as extended instruction set |
0.99 Rev 6 |
2017-04-21 |
Alexey Sotkin |
Adding File and Line operands |
0.99 Rev 7 |
2017-06-05 |
Alexey Sotkin |
Moving Flags to operands. Adding several new instructions. |
0.99 Rev 8 |
2017-08-31 |
Alexey Sotkin |
Replacing File operand by Source operand. Fixing typos. Formatting |
0.99 Rev 9 |
2017-09-05 |
Alexey Sotkin |
Clarifying representation of opaque types |
0.99 Rev 10 |
2017-09-13 |
Alexey Sotkin |
Support of multidimensional arrays. Adding DebugFunctionDeclaration. Updating debug operations. |
0.99 Rev 11 |
2017-12-13 |
Alexey Sotkin |
Removing "Op" prefix |
0.99 Rev 12 |
2017-12-13 |
Alexey Sotkin |
Changing style of enum tokens to CamelCase |
1.00 Rev 1 |
2017-12-14 |
David Neto |
Approved by SPIR WG on 2017-09-22. Change to 1.00 Rev 1 |