1e5b7e91aa
Extending the lifetime of these type index mappings does increase memory usage (+2% in my case), but it decouples type merging from symbol merging. This is a pre-requisite for two changes that I have in mind: - parallel type merging: speeds up slow type merging - defered symbol merging: avoid heap allocating (relocating) all symbols This eliminates CVIndexMap and moves its data into TpiSource. The maps are also split into a SmallVector and ArrayRef component, so that the ipiMap can alias the tpiMap for /Z7 object files, and so that both maps can simply alias the PDB type server maps for /Zi files. Splitting TypeServerSource establishes that all input types to be merged can be identified with two 32-bit indices: - The index of the TpiSource object - The type index of the record This is useful, because this information can be stored in a single 64-bit atomic word to enable concurrent hashtable insertion. One last change is that now all object files with debugChunks get a TpiSource, even if they have no type info. This avoids some null checks and special cases. Differential Revision: https://reviews.llvm.org/D87736
62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
//===- TypeMerger.h ---------------------------------------------*- 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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#ifndef LLD_COFF_TYPEMERGER_H
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#define LLD_COFF_TYPEMERGER_H
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#include "Config.h"
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#include "llvm/DebugInfo/CodeView/GlobalTypeTableBuilder.h"
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#include "llvm/DebugInfo/CodeView/MergingTypeTableBuilder.h"
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#include "llvm/Support/Allocator.h"
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namespace lld {
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namespace coff {
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class TypeMerger {
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public:
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TypeMerger(llvm::BumpPtrAllocator &alloc)
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: typeTable(alloc), idTable(alloc), globalTypeTable(alloc),
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globalIDTable(alloc) {}
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/// Get the type table or the global type table if /DEBUG:GHASH is enabled.
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inline llvm::codeview::TypeCollection &getTypeTable() {
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if (config->debugGHashes)
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return globalTypeTable;
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return typeTable;
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}
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/// Get the ID table or the global ID table if /DEBUG:GHASH is enabled.
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inline llvm::codeview::TypeCollection &getIDTable() {
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if (config->debugGHashes)
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return globalIDTable;
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return idTable;
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}
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/// Type records that will go into the PDB TPI stream.
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llvm::codeview::MergingTypeTableBuilder typeTable;
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/// Item records that will go into the PDB IPI stream.
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llvm::codeview::MergingTypeTableBuilder idTable;
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/// Type records that will go into the PDB TPI stream (for /DEBUG:GHASH)
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llvm::codeview::GlobalTypeTableBuilder globalTypeTable;
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/// Item records that will go into the PDB IPI stream (for /DEBUG:GHASH)
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llvm::codeview::GlobalTypeTableBuilder globalIDTable;
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// When showSummary is enabled, these are histograms of TPI and IPI records
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// keyed by type index.
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SmallVector<uint32_t, 0> tpiCounts;
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SmallVector<uint32_t, 0> ipiCounts;
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};
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} // namespace coff
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} // namespace lld
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#endif
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