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e89e3eda62
The struct LineNoCacheTy is in SourceMgr.cpp inside anonymous namespace. This diff changes the order of fields and removes the excessive padding (8 bytes). Patch by Alexander Shaposhnikov! Differential revision: https://reviews.llvm.org/D23546 llvm-svn: 278838
484 lines
16 KiB
C++
484 lines
16 KiB
C++
//===- SourceMgr.cpp - Manager for Simple Source Buffers & Diagnostics ----===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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/STLExtras.h"
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#include "llvm/ADT/Twine.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/raw_ostream.h"
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using namespace llvm;
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static const size_t TabStop = 8;
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namespace {
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struct LineNoCacheTy {
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const char *LastQuery;
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unsigned LastQueryBufferID;
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unsigned LineNoOfQuery;
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};
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}
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static LineNoCacheTy *getCache(void *Ptr) {
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return (LineNoCacheTy*)Ptr;
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}
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SourceMgr::~SourceMgr() {
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// Delete the line # cache if allocated.
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if (LineNoCacheTy *Cache = getCache(LineNoCache))
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delete Cache;
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}
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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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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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const MemoryBuffer *Buff = getMemoryBuffer(BufferID);
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// Count the number of \n's between the start of the file and the specified
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// location.
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unsigned LineNo = 1;
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const char *BufStart = Buff->getBufferStart();
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const char *Ptr = BufStart;
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// If we have a line number cache, and if the query is to a later point in the
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// same file, start searching from the last query location. This optimizes
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// for the case when multiple diagnostics come out of one file in order.
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if (LineNoCacheTy *Cache = getCache(LineNoCache))
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if (Cache->LastQueryBufferID == BufferID &&
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Cache->LastQuery <= Loc.getPointer()) {
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Ptr = Cache->LastQuery;
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LineNo = Cache->LineNoOfQuery;
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}
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// Scan for the location being queried, keeping track of the number of lines
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// we see.
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for (; SMLoc::getFromPointer(Ptr) != Loc; ++Ptr)
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if (*Ptr == '\n') ++LineNo;
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// Allocate the line number cache if it doesn't exist.
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if (!LineNoCache)
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LineNoCache = new LineNoCacheTy();
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// Update the line # cache.
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LineNoCacheTy &Cache = *getCache(LineNoCache);
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Cache.LastQueryBufferID = BufferID;
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Cache.LastQuery = Ptr;
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Cache.LineNoOfQuery = LineNo;
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size_t NewlineOffs = StringRef(BufStart, Ptr-BufStart).find_last_of("\n\r");
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if (NewlineOffs == StringRef::npos) NewlineOffs = ~(size_t)0;
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return std::make_pair(LineNo, Ptr-BufStart-NewlineOffs);
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}
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void SourceMgr::PrintIncludeStack(SMLoc IncludeLoc, raw_ostream &OS) const {
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if (IncludeLoc == SMLoc()) 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 "
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<< 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,
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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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const char *BufferID = "<unknown>";
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std::string 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 = std::string(LineStart, LineEnd);
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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()) 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(),
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LineStr, 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,
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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(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(llvm::errs(), Loc, Kind, Msg, Ranges, FixIts, ShowColors);
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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,
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int Line, int Col, SourceMgr::DiagKind Kind,
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StringRef Msg, 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(FN), LineNo(Line), ColumnNo(Col), Kind(Kind),
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Message(Msg), LineContents(LineStr), Ranges(Ranges.vec()),
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FixIts(Hints.begin(), Hints.end()) {
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std::sort(FixIts.begin(), FixIts.end());
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}
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static void buildFixItLine(std::string &CaretLine, std::string &FixItLine,
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ArrayRef<SMFixIt> FixIts, 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 (ArrayRef<SMFixIt>::iterator I = FixIts.begin(), E = FixIts.end();
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I != E; ++I) {
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// If the fixit contains a newline or tab, ignore it.
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if (I->getText().find_first_of("\n\r\t") != StringRef::npos)
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continue;
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SMRange R = I->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)llvm::sys::locale::columnWidth(I->getText()) ==
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I->getText().size());
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// This relies on one byte per column in our fixit hints.
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unsigned LastColumnModified = HintCol + I->getText().size();
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if (LastColumnModified > FixItLine.size())
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FixItLine.resize(LastColumnModified, ' ');
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std::copy(I->getText().begin(), I->getText().end(),
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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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if (LineContents[i] != '\t') {
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S << LineContents[i];
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++OutCol;
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continue;
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}
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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) {
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return c & 0x80;
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}
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void SMDiagnostic::print(const char *ProgName, raw_ostream &S, bool ShowColors,
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bool ShowKindLabel) const {
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// Display colors only if OS supports colors.
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ShowColors &= S.has_colors();
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if (ShowColors)
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S.changeColor(raw_ostream::SAVEDCOLOR, true);
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if (ProgName && ProgName[0])
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S << ProgName << ": ";
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if (!Filename.empty()) {
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if (Filename == "-")
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S << "<stdin>";
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else
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S << Filename;
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if (LineNo != -1) {
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S << ':' << LineNo;
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if (ColumnNo != -1)
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S << ':' << (ColumnNo+1);
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}
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S << ": ";
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}
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if (ShowKindLabel) {
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switch (Kind) {
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case SourceMgr::DK_Error:
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if (ShowColors)
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S.changeColor(raw_ostream::RED, true);
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S << "error: ";
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break;
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case SourceMgr::DK_Warning:
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if (ShowColors)
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S.changeColor(raw_ostream::MAGENTA, true);
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S << "warning: ";
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break;
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case SourceMgr::DK_Note:
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if (ShowColors)
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S.changeColor(raw_ostream::BLACK, true);
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S << "note: ";
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break;
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}
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if (ShowColors) {
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S.resetColor();
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S.changeColor(raw_ostream::SAVEDCOLOR, true);
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}
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}
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S << Message << '\n';
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if (ShowColors)
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S.resetColor();
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if (LineNo == -1 || ColumnNo == -1)
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return;
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// FIXME: If there are multibyte or multi-column characters in the source, all
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// our ranges will be wrong. To do this properly, we'll need a byte-to-column
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// map like Clang's TextDiagnostic. For now, we'll just handle tabs by
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// expanding them later, and bail out rather than show incorrect ranges and
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// misaligned fixits for any other odd characters.
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if (find_if(LineContents, isNonASCII) != LineContents.end()) {
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printSourceLine(S, LineContents);
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return;
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}
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size_t NumColumns = LineContents.size();
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// Build the line with the caret and ranges.
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std::string CaretLine(NumColumns+1, ' ');
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// Expand any ranges.
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for (unsigned r = 0, e = Ranges.size(); r != e; ++r) {
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std::pair<unsigned, unsigned> R = Ranges[r];
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std::fill(&CaretLine[R.first],
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&CaretLine[std::min((size_t)R.second, CaretLine.size())],
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'~');
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}
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// Add any fix-its.
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// FIXME: Find the beginning of the line properly for multibyte characters.
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std::string FixItInsertionLine;
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buildFixItLine(CaretLine, FixItInsertionLine, FixIts,
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makeArrayRef(Loc.getPointer() - ColumnNo,
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LineContents.size()));
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// Finally, plop on the caret.
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if (unsigned(ColumnNo) <= NumColumns)
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CaretLine[ColumnNo] = '^';
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else
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CaretLine[NumColumns] = '^';
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// ... and remove trailing whitespace so the output doesn't wrap for it. We
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// know that the line isn't completely empty because it has the caret in it at
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// least.
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CaretLine.erase(CaretLine.find_last_not_of(' ')+1);
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printSourceLine(S, LineContents);
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if (ShowColors)
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S.changeColor(raw_ostream::GREEN, true);
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// Print out the caret line, matching tabs in the source line.
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for (unsigned i = 0, e = CaretLine.size(), OutCol = 0; i != e; ++i) {
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if (i >= LineContents.size() || LineContents[i] != '\t') {
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S << CaretLine[i];
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++OutCol;
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continue;
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}
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// Okay, we have a tab. Insert the appropriate number of characters.
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do {
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S << CaretLine[i];
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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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if (ShowColors)
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S.resetColor();
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// Print out the replacement line, matching tabs in the source line.
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if (FixItInsertionLine.empty())
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return;
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for (size_t i = 0, e = FixItInsertionLine.size(), OutCol = 0; i < e; ++i) {
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if (i >= LineContents.size() || LineContents[i] != '\t') {
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S << FixItInsertionLine[i];
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++OutCol;
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continue;
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}
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// Okay, we have a tab. Insert the appropriate number of characters.
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do {
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S << FixItInsertionLine[i];
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// FIXME: This is trying not to break up replacements, but then to re-sync
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// with the tabs between replacements. This will fail, though, if two
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// fix-it replacements are exactly adjacent, or if a fix-it contains a
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// space. Really we should be precomputing column widths, which we'll
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// need anyway for multibyte chars.
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if (FixItInsertionLine[i] != ' ')
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++i;
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++OutCol;
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} while (((OutCol % TabStop) != 0) && i != e);
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}
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S << '\n';
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}
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