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112 lines
3.6 KiB
C++
112 lines
3.6 KiB
C++
//===- lib/Support/CodeGenCoverage.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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/// \file
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/// This file implements the CodeGenCoverage class.
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/CodeGenCoverage.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Mutex.h"
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#include "llvm/Support/Process.h"
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#include "llvm/Support/ScopedPrinter.h"
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#include "llvm/Support/ToolOutputFile.h"
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using namespace llvm;
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static sys::SmartMutex<true> OutputMutex;
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CodeGenCoverage::CodeGenCoverage() {}
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void CodeGenCoverage::setCovered(uint64_t RuleID) {
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if (RuleCoverage.size() <= RuleID)
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RuleCoverage.resize(RuleID + 1, 0);
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RuleCoverage[RuleID] = true;
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}
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bool CodeGenCoverage::isCovered(uint64_t RuleID) const {
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if (RuleCoverage.size() <= RuleID)
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return false;
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return RuleCoverage[RuleID];
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}
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iterator_range<CodeGenCoverage::const_covered_iterator>
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CodeGenCoverage::covered() const {
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return RuleCoverage.set_bits();
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}
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bool CodeGenCoverage::parse(MemoryBuffer &Buffer, StringRef BackendName) {
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const char *CurPtr = Buffer.getBufferStart();
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while (CurPtr != Buffer.getBufferEnd()) {
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// Read the backend name from the input.
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const char *LexedBackendName = CurPtr;
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while (*CurPtr++ != 0)
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;
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if (CurPtr == Buffer.getBufferEnd())
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return false; // Data is invalid, expected rule id's to follow.
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bool IsForThisBackend = BackendName.equals(LexedBackendName);
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while (CurPtr != Buffer.getBufferEnd()) {
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if (std::distance(CurPtr, Buffer.getBufferEnd()) < 8)
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return false; // Data is invalid. Not enough bytes for another rule id.
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uint64_t RuleID = support::endian::read64(CurPtr, support::native);
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CurPtr += 8;
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// ~0ull terminates the rule id list.
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if (RuleID == ~0ull)
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break;
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// Anything else, is recorded or ignored depending on whether it's
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// intended for the backend we're interested in.
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if (IsForThisBackend)
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setCovered(RuleID);
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}
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}
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return true;
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}
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bool CodeGenCoverage::emit(StringRef CoveragePrefix,
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StringRef BackendName) const {
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if (!CoveragePrefix.empty() && !RuleCoverage.empty()) {
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sys::SmartScopedLock<true> Lock(OutputMutex);
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// We can handle locking within a process easily enough but we don't want to
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// manage it between multiple processes. Use the process ID to ensure no
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// more than one process is ever writing to the same file at the same time.
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std::string Pid = llvm::to_string(sys::Process::getProcessId());
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std::string CoverageFilename = (CoveragePrefix + Pid).str();
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std::error_code EC;
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sys::fs::OpenFlags OpenFlags = sys::fs::OF_Append;
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std::unique_ptr<ToolOutputFile> CoverageFile =
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std::make_unique<ToolOutputFile>(CoverageFilename, EC, OpenFlags);
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if (EC)
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return false;
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uint64_t Zero = 0;
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uint64_t InvZero = ~0ull;
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CoverageFile->os() << BackendName;
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CoverageFile->os().write((const char *)&Zero, sizeof(unsigned char));
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for (uint64_t I : RuleCoverage.set_bits())
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CoverageFile->os().write((const char *)&I, sizeof(uint64_t));
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CoverageFile->os().write((const char *)&InvZero, sizeof(uint64_t));
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CoverageFile->keep();
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}
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return true;
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}
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void CodeGenCoverage::reset() { RuleCoverage.resize(0); }
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