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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
49 lines
1.6 KiB
C++
49 lines
1.6 KiB
C++
//===- RemarkStringTable.cpp ----------------------------------------------===//
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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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// Implementation of the Remark string table used at remark generation.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Remarks/RemarkStringTable.h"
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#include "llvm/Support/EndianStream.h"
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#include "llvm/Support/Error.h"
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#include <vector>
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using namespace llvm;
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using namespace llvm::remarks;
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std::pair<unsigned, StringRef> StringTable::add(StringRef Str) {
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size_t NextID = StrTab.size();
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auto KV = StrTab.insert({Str, NextID});
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// If it's a new string, add it to the final size.
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if (KV.second)
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SerializedSize += KV.first->first().size() + 1; // +1 for the '\0'
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// Can be either NextID or the previous ID if the string is already there.
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return {KV.first->second, KV.first->first()};
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}
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void StringTable::serialize(raw_ostream &OS) const {
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// Emit the number of strings.
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uint64_t StrTabSize = SerializedSize;
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support::endian::write(OS, StrTabSize, support::little);
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// Emit the sequence of strings.
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for (StringRef Str : serialize()) {
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OS << Str;
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// Explicitly emit a '\0'.
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OS.write('\0');
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}
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}
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std::vector<StringRef> StringTable::serialize() const {
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std::vector<StringRef> Strings{StrTab.size()};
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for (const auto &KV : StrTab)
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Strings[KV.second] = KV.first();
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return Strings;
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}
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