forked from OSchip/llvm-project
606 lines
21 KiB
C++
606 lines
21 KiB
C++
//===- SourceMgr.cpp - Manager for Simple Source Buffers & Diagnostics ----===//
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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 implements the SourceMgr class. This class is used as a simple
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// substrate for diagnostics, #include handling, and other low level things for
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// simple parsers.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/ErrorOr.h"
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#include "llvm/Support/Locale.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/SMLoc.h"
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#include "llvm/Support/WithColor.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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#include <cassert>
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#include <cstddef>
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#include <limits>
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#include <memory>
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#include <string>
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#include <utility>
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using namespace llvm;
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static const size_t TabStop = 8;
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unsigned SourceMgr::AddIncludeFile(const std::string &Filename,
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SMLoc IncludeLoc,
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std::string &IncludedFile) {
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IncludedFile = Filename;
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ErrorOr<std::unique_ptr<MemoryBuffer>> NewBufOrErr =
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MemoryBuffer::getFile(IncludedFile);
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// If the file didn't exist directly, see if it's in an include path.
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for (unsigned i = 0, e = IncludeDirectories.size(); i != e && !NewBufOrErr;
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++i) {
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IncludedFile =
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IncludeDirectories[i] + sys::path::get_separator().data() + Filename;
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NewBufOrErr = MemoryBuffer::getFile(IncludedFile);
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}
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if (!NewBufOrErr)
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return 0;
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return AddNewSourceBuffer(std::move(*NewBufOrErr), IncludeLoc);
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}
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unsigned SourceMgr::FindBufferContainingLoc(SMLoc Loc) const {
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for (unsigned i = 0, e = Buffers.size(); i != e; ++i)
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if (Loc.getPointer() >= Buffers[i].Buffer->getBufferStart() &&
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// Use <= here so that a pointer to the null at the end of the buffer
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// is included as part of the buffer.
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Loc.getPointer() <= Buffers[i].Buffer->getBufferEnd())
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return i + 1;
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return 0;
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}
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template <typename T>
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static std::vector<T> &GetOrCreateOffsetCache(void *&OffsetCache,
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MemoryBuffer *Buffer) {
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if (OffsetCache)
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return *static_cast<std::vector<T> *>(OffsetCache);
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// Lazily fill in the offset cache.
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auto *Offsets = new std::vector<T>();
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size_t Sz = Buffer->getBufferSize();
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assert(Sz <= std::numeric_limits<T>::max());
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StringRef S = Buffer->getBuffer();
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for (size_t N = 0; N < Sz; ++N) {
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if (S[N] == '\n')
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Offsets->push_back(static_cast<T>(N));
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}
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OffsetCache = Offsets;
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return *Offsets;
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}
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template <typename T>
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unsigned SourceMgr::SrcBuffer::getLineNumberSpecialized(const char *Ptr) const {
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std::vector<T> &Offsets =
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GetOrCreateOffsetCache<T>(OffsetCache, Buffer.get());
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const char *BufStart = Buffer->getBufferStart();
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assert(Ptr >= BufStart && Ptr <= Buffer->getBufferEnd());
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ptrdiff_t PtrDiff = Ptr - BufStart;
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assert(PtrDiff >= 0 &&
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static_cast<size_t>(PtrDiff) <= std::numeric_limits<T>::max());
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T PtrOffset = static_cast<T>(PtrDiff);
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// llvm::lower_bound gives the number of EOL before PtrOffset. Add 1 to get
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// the line number.
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return llvm::lower_bound(Offsets, PtrOffset) - Offsets.begin() + 1;
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}
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/// Look up a given \p Ptr in in the buffer, determining which line it came
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/// from.
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unsigned SourceMgr::SrcBuffer::getLineNumber(const char *Ptr) const {
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size_t Sz = Buffer->getBufferSize();
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if (Sz <= std::numeric_limits<uint8_t>::max())
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return getLineNumberSpecialized<uint8_t>(Ptr);
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else if (Sz <= std::numeric_limits<uint16_t>::max())
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return getLineNumberSpecialized<uint16_t>(Ptr);
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else if (Sz <= std::numeric_limits<uint32_t>::max())
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return getLineNumberSpecialized<uint32_t>(Ptr);
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else
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return getLineNumberSpecialized<uint64_t>(Ptr);
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}
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template <typename T>
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const char *SourceMgr::SrcBuffer::getPointerForLineNumberSpecialized(
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unsigned LineNo) const {
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std::vector<T> &Offsets =
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GetOrCreateOffsetCache<T>(OffsetCache, Buffer.get());
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// We start counting line and column numbers from 1.
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if (LineNo != 0)
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--LineNo;
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const char *BufStart = Buffer->getBufferStart();
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// The offset cache contains the location of the \n for the specified line,
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// we want the start of the line. As such, we look for the previous entry.
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if (LineNo == 0)
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return BufStart;
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if (LineNo > Offsets.size())
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return nullptr;
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return BufStart + Offsets[LineNo - 1] + 1;
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}
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/// Return a pointer to the first character of the specified line number or
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/// null if the line number is invalid.
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const char *
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SourceMgr::SrcBuffer::getPointerForLineNumber(unsigned LineNo) const {
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size_t Sz = Buffer->getBufferSize();
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if (Sz <= std::numeric_limits<uint8_t>::max())
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return getPointerForLineNumberSpecialized<uint8_t>(LineNo);
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else if (Sz <= std::numeric_limits<uint16_t>::max())
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return getPointerForLineNumberSpecialized<uint16_t>(LineNo);
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else if (Sz <= std::numeric_limits<uint32_t>::max())
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return getPointerForLineNumberSpecialized<uint32_t>(LineNo);
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else
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return getPointerForLineNumberSpecialized<uint64_t>(LineNo);
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}
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SourceMgr::SrcBuffer::SrcBuffer(SourceMgr::SrcBuffer &&Other)
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: Buffer(std::move(Other.Buffer)), OffsetCache(Other.OffsetCache),
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IncludeLoc(Other.IncludeLoc) {
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Other.OffsetCache = nullptr;
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}
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SourceMgr::SrcBuffer::~SrcBuffer() {
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if (OffsetCache) {
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size_t Sz = Buffer->getBufferSize();
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if (Sz <= std::numeric_limits<uint8_t>::max())
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delete static_cast<std::vector<uint8_t> *>(OffsetCache);
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else if (Sz <= std::numeric_limits<uint16_t>::max())
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delete static_cast<std::vector<uint16_t> *>(OffsetCache);
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else if (Sz <= std::numeric_limits<uint32_t>::max())
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delete static_cast<std::vector<uint32_t> *>(OffsetCache);
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else
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delete static_cast<std::vector<uint64_t> *>(OffsetCache);
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OffsetCache = nullptr;
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}
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}
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std::pair<unsigned, unsigned>
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SourceMgr::getLineAndColumn(SMLoc Loc, unsigned BufferID) const {
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if (!BufferID)
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BufferID = FindBufferContainingLoc(Loc);
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assert(BufferID && "Invalid location!");
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auto &SB = getBufferInfo(BufferID);
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const char *Ptr = Loc.getPointer();
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unsigned LineNo = SB.getLineNumber(Ptr);
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const char *BufStart = SB.Buffer->getBufferStart();
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size_t NewlineOffs = StringRef(BufStart, Ptr - BufStart).find_last_of("\n\r");
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if (NewlineOffs == StringRef::npos)
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NewlineOffs = ~(size_t)0;
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return std::make_pair(LineNo, Ptr - BufStart - NewlineOffs);
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}
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// FIXME: Note that the formatting of source locations is spread between
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// multiple functions, some in SourceMgr and some in SMDiagnostic. A better
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// solution would be a general-purpose source location formatter
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// in one of those two classes, or possibly in SMLoc.
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/// Get a string with the source location formatted in the standard
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/// style, but without the line offset. If \p IncludePath is true, the path
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/// is included. If false, only the file name and extension are included.
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std::string SourceMgr::getFormattedLocationNoOffset(SMLoc Loc,
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bool IncludePath) const {
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auto BufferID = FindBufferContainingLoc(Loc);
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assert(BufferID && "Invalid location!");
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auto FileSpec = getBufferInfo(BufferID).Buffer->getBufferIdentifier();
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if (IncludePath) {
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return FileSpec.str() + ":" + std::to_string(FindLineNumber(Loc, BufferID));
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} else {
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auto I = FileSpec.find_last_of("/\\");
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I = (I == FileSpec.size()) ? 0 : (I + 1);
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return FileSpec.substr(I).str() + ":" +
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std::to_string(FindLineNumber(Loc, BufferID));
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}
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}
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/// Given a line and column number in a mapped buffer, turn it into an SMLoc.
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/// This will return a null SMLoc if the line/column location is invalid.
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SMLoc SourceMgr::FindLocForLineAndColumn(unsigned BufferID, unsigned LineNo,
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unsigned ColNo) {
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auto &SB = getBufferInfo(BufferID);
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const char *Ptr = SB.getPointerForLineNumber(LineNo);
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if (!Ptr)
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return SMLoc();
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// We start counting line and column numbers from 1.
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if (ColNo != 0)
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--ColNo;
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// If we have a column number, validate it.
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if (ColNo) {
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// Make sure the location is within the current line.
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if (Ptr + ColNo > SB.Buffer->getBufferEnd())
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return SMLoc();
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// Make sure there is no newline in the way.
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if (StringRef(Ptr, ColNo).find_first_of("\n\r") != StringRef::npos)
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return SMLoc();
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Ptr += ColNo;
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}
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return SMLoc::getFromPointer(Ptr);
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}
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void SourceMgr::PrintIncludeStack(SMLoc IncludeLoc, raw_ostream &OS) const {
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if (IncludeLoc == SMLoc())
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return; // Top of stack.
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unsigned CurBuf = FindBufferContainingLoc(IncludeLoc);
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assert(CurBuf && "Invalid or unspecified location!");
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PrintIncludeStack(getBufferInfo(CurBuf).IncludeLoc, OS);
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OS << "Included from " << getBufferInfo(CurBuf).Buffer->getBufferIdentifier()
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<< ":" << FindLineNumber(IncludeLoc, CurBuf) << ":\n";
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}
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SMDiagnostic SourceMgr::GetMessage(SMLoc Loc, SourceMgr::DiagKind Kind,
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const Twine &Msg, ArrayRef<SMRange> Ranges,
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ArrayRef<SMFixIt> FixIts) const {
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// First thing to do: find the current buffer containing the specified
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// location to pull out the source line.
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SmallVector<std::pair<unsigned, unsigned>, 4> ColRanges;
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std::pair<unsigned, unsigned> LineAndCol;
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StringRef BufferID = "<unknown>";
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StringRef LineStr;
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if (Loc.isValid()) {
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unsigned CurBuf = FindBufferContainingLoc(Loc);
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assert(CurBuf && "Invalid or unspecified location!");
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const MemoryBuffer *CurMB = getMemoryBuffer(CurBuf);
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BufferID = CurMB->getBufferIdentifier();
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// Scan backward to find the start of the line.
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const char *LineStart = Loc.getPointer();
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const char *BufStart = CurMB->getBufferStart();
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while (LineStart != BufStart && LineStart[-1] != '\n' &&
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LineStart[-1] != '\r')
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--LineStart;
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// Get the end of the line.
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const char *LineEnd = Loc.getPointer();
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const char *BufEnd = CurMB->getBufferEnd();
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while (LineEnd != BufEnd && LineEnd[0] != '\n' && LineEnd[0] != '\r')
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++LineEnd;
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LineStr = StringRef(LineStart, LineEnd - LineStart);
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// Convert any ranges to column ranges that only intersect the line of the
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// location.
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for (unsigned i = 0, e = Ranges.size(); i != e; ++i) {
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SMRange R = Ranges[i];
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if (!R.isValid())
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continue;
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// If the line doesn't contain any part of the range, then ignore it.
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if (R.Start.getPointer() > LineEnd || R.End.getPointer() < LineStart)
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continue;
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// Ignore pieces of the range that go onto other lines.
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if (R.Start.getPointer() < LineStart)
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R.Start = SMLoc::getFromPointer(LineStart);
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if (R.End.getPointer() > LineEnd)
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R.End = SMLoc::getFromPointer(LineEnd);
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// Translate from SMLoc ranges to column ranges.
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// FIXME: Handle multibyte characters.
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ColRanges.push_back(std::make_pair(R.Start.getPointer() - LineStart,
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R.End.getPointer() - LineStart));
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}
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LineAndCol = getLineAndColumn(Loc, CurBuf);
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}
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return SMDiagnostic(*this, Loc, BufferID, LineAndCol.first,
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LineAndCol.second - 1, Kind, Msg.str(), LineStr,
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ColRanges, FixIts);
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}
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void SourceMgr::PrintMessage(raw_ostream &OS, const SMDiagnostic &Diagnostic,
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bool ShowColors) const {
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// Report the message with the diagnostic handler if present.
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if (DiagHandler) {
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DiagHandler(Diagnostic, DiagContext);
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return;
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}
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if (Diagnostic.getLoc().isValid()) {
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unsigned CurBuf = FindBufferContainingLoc(Diagnostic.getLoc());
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assert(CurBuf && "Invalid or unspecified location!");
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PrintIncludeStack(getBufferInfo(CurBuf).IncludeLoc, OS);
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}
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Diagnostic.print(nullptr, OS, ShowColors);
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}
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void SourceMgr::PrintMessage(raw_ostream &OS, SMLoc Loc,
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SourceMgr::DiagKind Kind, const Twine &Msg,
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ArrayRef<SMRange> Ranges, ArrayRef<SMFixIt> FixIts,
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bool ShowColors) const {
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PrintMessage(OS, GetMessage(Loc, Kind, Msg, Ranges, FixIts), ShowColors);
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}
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void SourceMgr::PrintMessage(SMLoc Loc, SourceMgr::DiagKind Kind,
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const Twine &Msg, ArrayRef<SMRange> Ranges,
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ArrayRef<SMFixIt> FixIts, bool ShowColors) const {
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PrintMessage(errs(), Loc, Kind, Msg, Ranges, FixIts, ShowColors);
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}
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//===----------------------------------------------------------------------===//
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// SMFixIt Implementation
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//===----------------------------------------------------------------------===//
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SMFixIt::SMFixIt(SMRange R, const Twine &Replacement)
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: Range(R), Text(Replacement.str()) {
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assert(R.isValid());
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}
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//===----------------------------------------------------------------------===//
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// SMDiagnostic Implementation
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//===----------------------------------------------------------------------===//
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SMDiagnostic::SMDiagnostic(const SourceMgr &sm, SMLoc L, StringRef FN, int Line,
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int Col, SourceMgr::DiagKind Kind, StringRef Msg,
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StringRef LineStr,
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ArrayRef<std::pair<unsigned, unsigned>> Ranges,
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ArrayRef<SMFixIt> Hints)
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: SM(&sm), Loc(L), Filename(std::string(FN)), LineNo(Line), ColumnNo(Col),
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Kind(Kind), Message(Msg), LineContents(LineStr), Ranges(Ranges.vec()),
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FixIts(Hints.begin(), Hints.end()) {
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llvm::sort(FixIts);
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}
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static void buildFixItLine(std::string &CaretLine, std::string &FixItLine,
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ArrayRef<SMFixIt> FixIts,
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ArrayRef<char> SourceLine) {
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if (FixIts.empty())
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return;
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const char *LineStart = SourceLine.begin();
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const char *LineEnd = SourceLine.end();
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size_t PrevHintEndCol = 0;
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for (const llvm::SMFixIt &Fixit : FixIts) {
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// If the fixit contains a newline or tab, ignore it.
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if (Fixit.getText().find_first_of("\n\r\t") != StringRef::npos)
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continue;
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SMRange R = Fixit.getRange();
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// If the line doesn't contain any part of the range, then ignore it.
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if (R.Start.getPointer() > LineEnd || R.End.getPointer() < LineStart)
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continue;
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// Translate from SMLoc to column.
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// Ignore pieces of the range that go onto other lines.
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// FIXME: Handle multibyte characters in the source line.
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unsigned FirstCol;
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if (R.Start.getPointer() < LineStart)
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FirstCol = 0;
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else
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FirstCol = R.Start.getPointer() - LineStart;
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// If we inserted a long previous hint, push this one forwards, and add
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// an extra space to show that this is not part of the previous
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// completion. This is sort of the best we can do when two hints appear
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// to overlap.
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//
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// Note that if this hint is located immediately after the previous
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// hint, no space will be added, since the location is more important.
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unsigned HintCol = FirstCol;
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if (HintCol < PrevHintEndCol)
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HintCol = PrevHintEndCol + 1;
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// FIXME: This assertion is intended to catch unintended use of multibyte
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// characters in fixits. If we decide to do this, we'll have to track
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// separate byte widths for the source and fixit lines.
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assert((size_t)sys::locale::columnWidth(Fixit.getText()) ==
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Fixit.getText().size());
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// This relies on one byte per column in our fixit hints.
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unsigned LastColumnModified = HintCol + Fixit.getText().size();
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if (LastColumnModified > FixItLine.size())
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FixItLine.resize(LastColumnModified, ' ');
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llvm::copy(Fixit.getText(), FixItLine.begin() + HintCol);
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PrevHintEndCol = LastColumnModified;
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// For replacements, mark the removal range with '~'.
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// FIXME: Handle multibyte characters in the source line.
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unsigned LastCol;
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if (R.End.getPointer() >= LineEnd)
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LastCol = LineEnd - LineStart;
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else
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LastCol = R.End.getPointer() - LineStart;
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std::fill(&CaretLine[FirstCol], &CaretLine[LastCol], '~');
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}
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}
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static void printSourceLine(raw_ostream &S, StringRef LineContents) {
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// Print out the source line one character at a time, so we can expand tabs.
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for (unsigned i = 0, e = LineContents.size(), OutCol = 0; i != e; ++i) {
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size_t NextTab = LineContents.find('\t', i);
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// If there were no tabs left, print the rest, we are done.
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if (NextTab == StringRef::npos) {
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S << LineContents.drop_front(i);
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break;
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}
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// Otherwise, print from i to NextTab.
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S << LineContents.slice(i, NextTab);
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OutCol += NextTab - i;
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i = NextTab;
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// If we have a tab, emit at least one space, then round up to 8 columns.
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do {
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S << ' ';
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++OutCol;
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} while ((OutCol % TabStop) != 0);
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}
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S << '\n';
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}
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static bool isNonASCII(char c) { return c & 0x80; }
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void SMDiagnostic::print(const char *ProgName, raw_ostream &OS, bool ShowColors,
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bool ShowKindLabel) const {
|
|
ColorMode Mode = ShowColors ? ColorMode::Auto : ColorMode::Disable;
|
|
|
|
{
|
|
WithColor S(OS, raw_ostream::SAVEDCOLOR, true, false, Mode);
|
|
|
|
if (ProgName && ProgName[0])
|
|
S << ProgName << ": ";
|
|
|
|
if (!Filename.empty()) {
|
|
if (Filename == "-")
|
|
S << "<stdin>";
|
|
else
|
|
S << Filename;
|
|
|
|
if (LineNo != -1) {
|
|
S << ':' << LineNo;
|
|
if (ColumnNo != -1)
|
|
S << ':' << (ColumnNo + 1);
|
|
}
|
|
S << ": ";
|
|
}
|
|
}
|
|
|
|
if (ShowKindLabel) {
|
|
switch (Kind) {
|
|
case SourceMgr::DK_Error:
|
|
WithColor::error(OS, "", !ShowColors);
|
|
break;
|
|
case SourceMgr::DK_Warning:
|
|
WithColor::warning(OS, "", !ShowColors);
|
|
break;
|
|
case SourceMgr::DK_Note:
|
|
WithColor::note(OS, "", !ShowColors);
|
|
break;
|
|
case SourceMgr::DK_Remark:
|
|
WithColor::remark(OS, "", !ShowColors);
|
|
break;
|
|
}
|
|
}
|
|
|
|
WithColor(OS, raw_ostream::SAVEDCOLOR, true, false, Mode) << Message << '\n';
|
|
|
|
if (LineNo == -1 || ColumnNo == -1)
|
|
return;
|
|
|
|
// FIXME: If there are multibyte or multi-column characters in the source, all
|
|
// our ranges will be wrong. To do this properly, we'll need a byte-to-column
|
|
// map like Clang's TextDiagnostic. For now, we'll just handle tabs by
|
|
// expanding them later, and bail out rather than show incorrect ranges and
|
|
// misaligned fixits for any other odd characters.
|
|
if (any_of(LineContents, isNonASCII)) {
|
|
printSourceLine(OS, LineContents);
|
|
return;
|
|
}
|
|
size_t NumColumns = LineContents.size();
|
|
|
|
// Build the line with the caret and ranges.
|
|
std::string CaretLine(NumColumns + 1, ' ');
|
|
|
|
// Expand any ranges.
|
|
for (const std::pair<unsigned, unsigned> &R : Ranges)
|
|
std::fill(&CaretLine[R.first],
|
|
&CaretLine[std::min((size_t)R.second, CaretLine.size())], '~');
|
|
|
|
// Add any fix-its.
|
|
// FIXME: Find the beginning of the line properly for multibyte characters.
|
|
std::string FixItInsertionLine;
|
|
buildFixItLine(
|
|
CaretLine, FixItInsertionLine, FixIts,
|
|
makeArrayRef(Loc.getPointer() - ColumnNo, LineContents.size()));
|
|
|
|
// Finally, plop on the caret.
|
|
if (unsigned(ColumnNo) <= NumColumns)
|
|
CaretLine[ColumnNo] = '^';
|
|
else
|
|
CaretLine[NumColumns] = '^';
|
|
|
|
// ... and remove trailing whitespace so the output doesn't wrap for it. We
|
|
// know that the line isn't completely empty because it has the caret in it at
|
|
// least.
|
|
CaretLine.erase(CaretLine.find_last_not_of(' ') + 1);
|
|
|
|
printSourceLine(OS, LineContents);
|
|
|
|
{
|
|
ColorMode Mode = ShowColors ? ColorMode::Auto : ColorMode::Disable;
|
|
WithColor S(OS, raw_ostream::GREEN, true, false, Mode);
|
|
|
|
// Print out the caret line, matching tabs in the source line.
|
|
for (unsigned i = 0, e = CaretLine.size(), OutCol = 0; i != e; ++i) {
|
|
if (i >= LineContents.size() || LineContents[i] != '\t') {
|
|
S << CaretLine[i];
|
|
++OutCol;
|
|
continue;
|
|
}
|
|
|
|
// Okay, we have a tab. Insert the appropriate number of characters.
|
|
do {
|
|
S << CaretLine[i];
|
|
++OutCol;
|
|
} while ((OutCol % TabStop) != 0);
|
|
}
|
|
S << '\n';
|
|
}
|
|
|
|
// Print out the replacement line, matching tabs in the source line.
|
|
if (FixItInsertionLine.empty())
|
|
return;
|
|
|
|
for (size_t i = 0, e = FixItInsertionLine.size(), OutCol = 0; i < e; ++i) {
|
|
if (i >= LineContents.size() || LineContents[i] != '\t') {
|
|
OS << FixItInsertionLine[i];
|
|
++OutCol;
|
|
continue;
|
|
}
|
|
|
|
// Okay, we have a tab. Insert the appropriate number of characters.
|
|
do {
|
|
OS << FixItInsertionLine[i];
|
|
// FIXME: This is trying not to break up replacements, but then to re-sync
|
|
// with the tabs between replacements. This will fail, though, if two
|
|
// fix-it replacements are exactly adjacent, or if a fix-it contains a
|
|
// space. Really we should be precomputing column widths, which we'll
|
|
// need anyway for multibyte chars.
|
|
if (FixItInsertionLine[i] != ' ')
|
|
++i;
|
|
++OutCol;
|
|
} while (((OutCol % TabStop) != 0) && i != e);
|
|
}
|
|
OS << '\n';
|
|
}
|