50 lines
2.0 KiB
C++
50 lines
2.0 KiB
C++
//===- PGOCtxProfWriter.cpp - Contextual Instrumentation profile writer ---===//
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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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// Write a contextual profile to bitstream.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ProfileData/PGOCtxProfWriter.h"
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#include "llvm/Bitstream/BitCodeEnums.h"
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using namespace llvm;
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using namespace llvm::ctx_profile;
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void PGOCtxProfileWriter::writeCounters(const ContextNode &Node) {
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Writer.EmitCode(bitc::UNABBREV_RECORD);
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Writer.EmitVBR(PGOCtxProfileRecords::Counters, VBREncodingBits);
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Writer.EmitVBR(Node.counters_size(), VBREncodingBits);
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for (uint32_t I = 0U; I < Node.counters_size(); ++I)
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Writer.EmitVBR64(Node.counters()[I], VBREncodingBits);
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}
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// recursively write all the subcontexts. We do need to traverse depth first to
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// model the context->subcontext implicitly, and since this captures call
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// stacks, we don't really need to be worried about stack overflow and we can
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// keep the implementation simple.
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void PGOCtxProfileWriter::writeImpl(std::optional<uint32_t> CallerIndex,
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const ContextNode &Node) {
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Writer.EnterSubblock(PGOCtxProfileBlockIDs::ContextNodeBlockID, CodeLen);
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Writer.EmitRecord(PGOCtxProfileRecords::Guid,
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SmallVector<uint64_t, 1>{Node.guid()});
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if (CallerIndex)
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Writer.EmitRecord(PGOCtxProfileRecords::CalleeIndex,
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SmallVector<uint64_t, 1>{*CallerIndex});
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writeCounters(Node);
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for (uint32_t I = 0U; I < Node.callsites_size(); ++I)
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for (const auto *Subcontext = Node.subContexts()[I]; Subcontext;
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Subcontext = Subcontext->next())
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writeImpl(I, *Subcontext);
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Writer.ExitBlock();
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}
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void PGOCtxProfileWriter::write(const ContextNode &RootNode) {
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writeImpl(std::nullopt, RootNode);
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}
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