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Summary:
I used this information to motivate splitting up the Intrinsic::ID enum
(5d986953c8b917bacfaa1f800fc1e242559f76be) and adding a key method to
clang::Sema (586f65d31f32ca6bc8cfdb8a4f61bee5057bf6c8) which saved a
fair amount of object file size.
Example output for clang.pdb:
Top 10 types responsible for the most TPI input bytes:
index total bytes count size
0x3890: 8,671,220 = 1,805 * 4,804
0xE13BE: 5,634,720 = 252 * 22,360
0x6874C: 5,181,600 = 408 * 12,700
0x2A1F: 4,520,528 = 1,574 * 2,872
0x64BFF: 4,024,020 = 469 * 8,580
0x1123: 4,012,020 = 2,157 * 1,860
0x6952: 3,753,792 = 912 * 4,116
0xC16F: 3,630,888 = 633 * 5,736
0x69DD: 3,601,160 = 985 * 3,656
0x678D: 3,577,904 = 319 * 11,216
In this case, we can see that record 0x3890 is responsible for ~8MB of
total object file size for objects in clang.
The user can then use llvm-pdbutil to find out what the record is:
$ llvm-pdbutil dump -types -type-index 0x3890
Types (TPI Stream)
============================================================
Showing 1 records.
0x3890 | LF_FIELDLIST [size = 4804]
- LF_STMEMBER [name = `WORDTYPE_MAX`, type = 0x1001, attrs = public]
- LF_MEMBER [name = `U`, Type = 0x37F0, offset = 0, attrs = private]
- LF_MEMBER [name = `BitWidth`, Type = 0x0075 (unsigned), offset = 8, attrs = private]
- LF_METHOD [name = `APInt`, # overloads = 8, overload list = 0x3805]
...
In this case, we can see that these are members of the APInt class,
which is emitted in 1805 object files.
The next largest type is ASTContext:
$ llvm-pdbutil dump -types -type-index 0xE13BE bin/clang.pdb
0xE13BE | LF_FIELDLIST [size = 22360]
- LF_BCLASS
type = 0x653EA, offset = 0, attrs = public
- LF_MEMBER [name = `Types`, Type = 0x653EB, offset = 8, attrs = private]
- LF_MEMBER [name = `ExtQualNodes`, Type = 0x653EC, offset = 24, attrs = private]
- LF_MEMBER [name = `ComplexTypes`, Type = 0x653ED, offset = 48, attrs = private]
- LF_MEMBER [name = `PointerTypes`, Type = 0x653EE, offset = 72, attrs = private]
...
ASTContext only appears 252 times, but the list of members is long, and
must be repeated everywhere it is used.
This was the output before I split Intrinsic::ID:
Top 10 types responsible for the most TPI input:
0x686C: 69,823,920 = 1,070 * 65,256
0x686D: 69,819,640 = 1,070 * 65,252
0x686E: 69,819,640 = 1,070 * 65,252
0x686B: 16,371,000 = 1,070 * 15,300
...
These records were all lists of intrinsic enums.
Reviewers: MaskRay, ruiu
Subscribers: mgrang, zturner, thakis, hans, akhuang, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D71437
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|---|---|---|
| .. | ||
| AppendingTypeTableBuilder.cpp | ||
| CMakeLists.txt | ||
| CodeViewError.cpp | ||
| CodeViewRecordIO.cpp | ||
| ContinuationRecordBuilder.cpp | ||
| CVSymbolVisitor.cpp | ||
| CVTypeVisitor.cpp | ||
| DebugChecksumsSubsection.cpp | ||
| DebugCrossExSubsection.cpp | ||
| DebugCrossImpSubsection.cpp | ||
| DebugFrameDataSubsection.cpp | ||
| DebugInlineeLinesSubsection.cpp | ||
| DebugLinesSubsection.cpp | ||
| DebugStringTableSubsection.cpp | ||
| DebugSubsection.cpp | ||
| DebugSubsectionRecord.cpp | ||
| DebugSubsectionVisitor.cpp | ||
| DebugSymbolRVASubsection.cpp | ||
| DebugSymbolsSubsection.cpp | ||
| EnumTables.cpp | ||
| Formatters.cpp | ||
| GlobalTypeTableBuilder.cpp | ||
| LazyRandomTypeCollection.cpp | ||
| Line.cpp | ||
| LLVMBuild.txt | ||
| MergingTypeTableBuilder.cpp | ||
| RecordName.cpp | ||
| RecordSerialization.cpp | ||
| SimpleTypeSerializer.cpp | ||
| StringsAndChecksums.cpp | ||
| SymbolDumper.cpp | ||
| SymbolRecordHelpers.cpp | ||
| SymbolRecordMapping.cpp | ||
| SymbolSerializer.cpp | ||
| TypeDumpVisitor.cpp | ||
| TypeHashing.cpp | ||
| TypeIndex.cpp | ||
| TypeIndexDiscovery.cpp | ||
| TypeRecordHelpers.cpp | ||
| TypeRecordMapping.cpp | ||
| TypeStreamMerger.cpp | ||
| TypeTableCollection.cpp | ||