forked from OSchip/llvm-project
90 lines
3.5 KiB
C++
90 lines
3.5 KiB
C++
//===- ToolUtilities.cpp - MLIR Tool Utilities ----------------------------===//
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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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// This file defines common utilities for implementing MLIR tools.
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/Support/ToolUtilities.h"
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#include "mlir/Support/LLVM.h"
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#include "mlir/Support/LogicalResult.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace mlir;
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LogicalResult
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mlir::splitAndProcessBuffer(std::unique_ptr<llvm::MemoryBuffer> originalBuffer,
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ChunkBufferHandler processChunkBuffer,
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raw_ostream &os) {
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const char splitMarkerConst[] = "// -----";
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StringRef splitMarker(splitMarkerConst);
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const int splitMarkerLen = splitMarker.size();
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auto *origMemBuffer = originalBuffer.get();
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SmallVector<StringRef, 8> rawSourceBuffers;
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const int checkLen = 2;
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// Split dropping the last checkLen chars to enable flagging near misses.
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origMemBuffer->getBuffer().split(rawSourceBuffers,
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splitMarker.drop_back(checkLen));
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if (rawSourceBuffers.empty())
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return success();
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// Add the original buffer to the source manager.
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llvm::SourceMgr fileSourceMgr;
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fileSourceMgr.AddNewSourceBuffer(std::move(originalBuffer), SMLoc());
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// Flag near misses by iterating over all the sub-buffers found when splitting
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// with the prefix of the splitMarker. Use a sliding window where we only add
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// a buffer as a sourceBuffer if terminated by a full match of the
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// splitMarker, else flag a warning (if near miss) and extend the size of the
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// buffer under consideration.
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SmallVector<StringRef, 8> sourceBuffers;
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StringRef prev;
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for (auto buffer : rawSourceBuffers) {
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if (prev.empty()) {
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prev = buffer;
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continue;
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}
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// Check that suffix is as expected and doesn't have any dash post.
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bool expectedSuffix = buffer.startswith(splitMarker.take_back(checkLen)) &&
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buffer.size() > checkLen && buffer[checkLen] != '0';
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if (expectedSuffix) {
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sourceBuffers.push_back(prev);
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prev = buffer.drop_front(checkLen);
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} else {
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// TODO: Consider making this a failure.
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auto splitLoc = SMLoc::getFromPointer(buffer.data());
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fileSourceMgr.PrintMessage(llvm::errs(), splitLoc,
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llvm::SourceMgr::DK_Warning,
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"near miss with file split marker");
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prev = StringRef(prev.data(),
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prev.size() + splitMarkerLen - checkLen + buffer.size());
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}
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}
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if (!prev.empty())
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sourceBuffers.push_back(prev);
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// Process each chunk in turn.
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bool hadFailure = false;
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for (auto &subBuffer : sourceBuffers) {
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auto splitLoc = SMLoc::getFromPointer(subBuffer.data());
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unsigned splitLine = fileSourceMgr.getLineAndColumn(splitLoc).first;
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auto subMemBuffer = llvm::MemoryBuffer::getMemBufferCopy(
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subBuffer, Twine("within split at ") +
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origMemBuffer->getBufferIdentifier() + ":" +
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Twine(splitLine) + " offset ");
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if (failed(processChunkBuffer(std::move(subMemBuffer), os)))
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hadFailure = true;
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}
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// If any fails, then return a failure of the tool.
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return failure(hadFailure);
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}
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