mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-22 18:54:02 +01:00
112 lines
3.6 KiB
C++
112 lines
3.6 KiB
C++
//===- lib/Support/CodeGenCoverage.cpp -------------------------------------==//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
/// \file
|
|
/// This file implements the CodeGenCoverage class.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Support/CodeGenCoverage.h"
|
|
|
|
#include "llvm/Support/Endian.h"
|
|
#include "llvm/Support/FileSystem.h"
|
|
#include "llvm/Support/MemoryBuffer.h"
|
|
#include "llvm/Support/Mutex.h"
|
|
#include "llvm/Support/Process.h"
|
|
#include "llvm/Support/ScopedPrinter.h"
|
|
#include "llvm/Support/ToolOutputFile.h"
|
|
|
|
using namespace llvm;
|
|
|
|
static sys::SmartMutex<true> OutputMutex;
|
|
|
|
CodeGenCoverage::CodeGenCoverage() {}
|
|
|
|
void CodeGenCoverage::setCovered(uint64_t RuleID) {
|
|
if (RuleCoverage.size() <= RuleID)
|
|
RuleCoverage.resize(RuleID + 1, 0);
|
|
RuleCoverage[RuleID] = true;
|
|
}
|
|
|
|
bool CodeGenCoverage::isCovered(uint64_t RuleID) const {
|
|
if (RuleCoverage.size() <= RuleID)
|
|
return false;
|
|
return RuleCoverage[RuleID];
|
|
}
|
|
|
|
iterator_range<CodeGenCoverage::const_covered_iterator>
|
|
CodeGenCoverage::covered() const {
|
|
return RuleCoverage.set_bits();
|
|
}
|
|
|
|
bool CodeGenCoverage::parse(MemoryBuffer &Buffer, StringRef BackendName) {
|
|
const char *CurPtr = Buffer.getBufferStart();
|
|
|
|
while (CurPtr != Buffer.getBufferEnd()) {
|
|
// Read the backend name from the input.
|
|
const char *LexedBackendName = CurPtr;
|
|
while (*CurPtr++ != 0)
|
|
;
|
|
if (CurPtr == Buffer.getBufferEnd())
|
|
return false; // Data is invalid, expected rule id's to follow.
|
|
|
|
bool IsForThisBackend = BackendName.equals(LexedBackendName);
|
|
while (CurPtr != Buffer.getBufferEnd()) {
|
|
if (std::distance(CurPtr, Buffer.getBufferEnd()) < 8)
|
|
return false; // Data is invalid. Not enough bytes for another rule id.
|
|
|
|
uint64_t RuleID = support::endian::read64(CurPtr, support::native);
|
|
CurPtr += 8;
|
|
|
|
// ~0ull terminates the rule id list.
|
|
if (RuleID == ~0ull)
|
|
break;
|
|
|
|
// Anything else, is recorded or ignored depending on whether it's
|
|
// intended for the backend we're interested in.
|
|
if (IsForThisBackend)
|
|
setCovered(RuleID);
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool CodeGenCoverage::emit(StringRef CoveragePrefix,
|
|
StringRef BackendName) const {
|
|
if (!CoveragePrefix.empty() && !RuleCoverage.empty()) {
|
|
sys::SmartScopedLock<true> Lock(OutputMutex);
|
|
|
|
// We can handle locking within a process easily enough but we don't want to
|
|
// manage it between multiple processes. Use the process ID to ensure no
|
|
// more than one process is ever writing to the same file at the same time.
|
|
std::string Pid = llvm::to_string(sys::Process::getProcessId());
|
|
|
|
std::string CoverageFilename = (CoveragePrefix + Pid).str();
|
|
|
|
std::error_code EC;
|
|
sys::fs::OpenFlags OpenFlags = sys::fs::OF_Append;
|
|
std::unique_ptr<ToolOutputFile> CoverageFile =
|
|
std::make_unique<ToolOutputFile>(CoverageFilename, EC, OpenFlags);
|
|
if (EC)
|
|
return false;
|
|
|
|
uint64_t Zero = 0;
|
|
uint64_t InvZero = ~0ull;
|
|
CoverageFile->os() << BackendName;
|
|
CoverageFile->os().write((const char *)&Zero, sizeof(unsigned char));
|
|
for (uint64_t I : RuleCoverage.set_bits())
|
|
CoverageFile->os().write((const char *)&I, sizeof(uint64_t));
|
|
CoverageFile->os().write((const char *)&InvZero, sizeof(uint64_t));
|
|
|
|
CoverageFile->keep();
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void CodeGenCoverage::reset() { RuleCoverage.resize(0); }
|