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04dcbb5165
* Add support for uniquing strings in the remark streamer and emitting the string table in the remarks section.
* Add parsing support for the string table in the RemarkParser.
From this remark:
```
--- !Missed
Pass: inline
Name: NoDefinition
DebugLoc: { File: 'test-suite/SingleSource/UnitTests/2002-04-17-PrintfChar.c',
Line: 7, Column: 3 }
Function: printArgsNoRet
Args:
- Callee: printf
- String: ' will not be inlined into '
- Caller: printArgsNoRet
DebugLoc: { File: 'test-suite/SingleSource/UnitTests/2002-04-17-PrintfChar.c',
Line: 6, Column: 0 }
- String: ' because its definition is unavailable'
...
```
to:
```
--- !Missed
Pass: 0
Name: 1
DebugLoc: { File: 3, Line: 7, Column: 3 }
Function: 2
Args:
- Callee: 4
- String: 5
- Caller: 2
DebugLoc: { File: 3, Line: 6, Column: 0 }
- String: 6
...
```
And the string table in the .remarks/__remarks section containing:
```
inline\0NoDefinition\0printArgsNoRet\0
test-suite/SingleSource/UnitTests/2002-04-17-PrintfChar.c\0printf\0
will not be inlined into \0 because its definition is unavailable\0
```
This is mostly supposed to be used for testing purposes, but it gives us
a 2x reduction in the remark size, and is an incremental change for the
updates to the remarks file format.
Differential Revision: https://reviews.llvm.org/D60227
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@359050 91177308-0d34-0410-b5e6-96231b3b80d8
60 lines
2.2 KiB
C++
60 lines
2.2 KiB
C++
//===-- RemarkStringTable.h - Serializing string table ----------*- C++/-*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This class is used to deduplicate and serialize a string table used for
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// generating remarks.
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//
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// For parsing a string table, use ParsedStringTable in RemarkParser.h
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_REMARKS_REMARK_STRING_TABLE_H
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#define LLVM_REMARKS_REMARK_STRING_TABLE_H
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/Allocator.h"
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#include <vector>
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namespace llvm {
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class raw_ostream;
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namespace remarks {
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/// The string table used for serializing remarks.
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/// This table can be for example serialized in a section to be consumed after
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/// the compilation.
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struct StringTable {
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/// Allocator holding all the memory used by the map.
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BumpPtrAllocator Allocator;
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/// The string table containing all the unique strings used in the output.
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/// It maps a string to an unique ID.
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StringMap<unsigned, BumpPtrAllocator &> StrTab;
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/// Total size of the string table when serialized.
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size_t SerializedSize = 0;
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StringTable() : Allocator(), StrTab(Allocator) {}
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/// Add a string to the table. It returns an unique ID of the string.
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std::pair<unsigned, StringRef> add(StringRef Str);
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/// Serialize the string table to a stream. It is serialized as a little
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/// endian uint64 (the size of the table in bytes) followed by a sequence of
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/// NULL-terminated strings, where the N-th string is the string with the ID N
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/// in the StrTab map.
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void serialize(raw_ostream &OS) const;
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/// Serialize the string table to a vector. This allows users to do the actual
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/// writing to file/memory/other.
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/// The string with the ID == N should be the N-th element in the vector.
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std::vector<StringRef> serialize() const;
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};
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} // end namespace remarks
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} // end namespace llvm
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#endif /* LLVM_REMARKS_REMARK_STRING_TABLE_H */
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