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//===- SourceMgr.h - Manager for Source Buffers & Diagnostics ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the SMDiagnostic and SourceMgr classes. This
// provides a simple substrate for diagnostics, #include handling, and other low
// level things for simple parsers.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_SOURCEMGR_H
#define LLVM_SUPPORT_SOURCEMGR_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SMLoc.h"
#include <string>
namespace llvm {
class SourceMgr;
class SMDiagnostic;
class SMFixIt;
class Twine;
class raw_ostream;
/// This owns the files read by a parser, handles include stacks,
/// and handles diagnostic wrangling.
class SourceMgr {
public:
enum DiagKind {
DK_Error,
DK_Warning,
DK_Note
};
/// Clients that want to handle their own diagnostics in a custom way can
/// register a function pointer+context as a diagnostic handler.
/// It gets called each time PrintMessage is invoked.
typedef void (*DiagHandlerTy)(const SMDiagnostic &, void *Context);
private:
struct SrcBuffer {
/// The memory buffer for the file.
std::unique_ptr<MemoryBuffer> Buffer;
/// This is the location of the parent include, or null if at the top level.
SMLoc IncludeLoc;
};
/// This is all of the buffers that we are reading from.
std::vector<SrcBuffer> Buffers;
// This is the list of directories we should search for include files in.
std::vector<std::string> IncludeDirectories;
/// This is a cache for line number queries, its implementation is really
/// private to SourceMgr.cpp.
mutable void *LineNoCache;
DiagHandlerTy DiagHandler;
void *DiagContext;
bool isValidBufferID(unsigned i) const { return i && i <= Buffers.size(); }
SourceMgr(const SourceMgr&) = delete;
void operator=(const SourceMgr&) = delete;
public:
SourceMgr()
: LineNoCache(nullptr), DiagHandler(nullptr), DiagContext(nullptr) {}
~SourceMgr();
void setIncludeDirs(const std::vector<std::string> &Dirs) {
IncludeDirectories = Dirs;
}
/// Specify a diagnostic handler to be invoked every time PrintMessage is
/// called. \p Ctx is passed into the handler when it is invoked.
void setDiagHandler(DiagHandlerTy DH, void *Ctx = nullptr) {
DiagHandler = DH;
DiagContext = Ctx;
}
DiagHandlerTy getDiagHandler() const { return DiagHandler; }
void *getDiagContext() const { return DiagContext; }
const SrcBuffer &getBufferInfo(unsigned i) const {
assert(isValidBufferID(i));
return Buffers[i - 1];
}
const MemoryBuffer *getMemoryBuffer(unsigned i) const {
assert(isValidBufferID(i));
return Buffers[i - 1].Buffer.get();
}
unsigned getNumBuffers() const {
return Buffers.size();
}
unsigned getMainFileID() const {
assert(getNumBuffers());
return 1;
}
SMLoc getParentIncludeLoc(unsigned i) const {
assert(isValidBufferID(i));
return Buffers[i - 1].IncludeLoc;
}
/// Add a new source buffer to this source manager. This takes ownership of
/// the memory buffer.
unsigned AddNewSourceBuffer(std::unique_ptr<MemoryBuffer> F,
SMLoc IncludeLoc) {
SrcBuffer NB;
NB.Buffer = std::move(F);
NB.IncludeLoc = IncludeLoc;
Buffers.push_back(std::move(NB));
return Buffers.size();
}
/// Search for a file with the specified name in the current directory or in
/// one of the IncludeDirs.
///
/// If no file is found, this returns 0, otherwise it returns the buffer ID
/// of the stacked file. The full path to the included file can be found in
/// \p IncludedFile.
unsigned AddIncludeFile(const std::string &Filename, SMLoc IncludeLoc,
std::string &IncludedFile);
/// Return the ID of the buffer containing the specified location.
///
/// 0 is returned if the buffer is not found.
unsigned FindBufferContainingLoc(SMLoc Loc) const;
/// Find the line number for the specified location in the specified file.
/// This is not a fast method.
unsigned FindLineNumber(SMLoc Loc, unsigned BufferID = 0) const {
return getLineAndColumn(Loc, BufferID).first;
}
/// Find the line and column number for the specified location in the
/// specified file. This is not a fast method.
std::pair<unsigned, unsigned> getLineAndColumn(SMLoc Loc,
unsigned BufferID = 0) const;
/// Emit a message about the specified location with the specified string.
///
/// \param ShowColors Display colored messages if output is a terminal and
/// the default error handler is used.
void PrintMessage(raw_ostream &OS, SMLoc Loc, DiagKind Kind,
const Twine &Msg,
ArrayRef<SMRange> Ranges = None,
ArrayRef<SMFixIt> FixIts = None,
bool ShowColors = true) const;
/// Emits a diagnostic to llvm::errs().
void PrintMessage(SMLoc Loc, DiagKind Kind, const Twine &Msg,
ArrayRef<SMRange> Ranges = None,
ArrayRef<SMFixIt> FixIts = None,
bool ShowColors = true) const;
/// Emits a manually-constructed diagnostic to the given output stream.
///
/// \param ShowColors Display colored messages if output is a terminal and
/// the default error handler is used.
void PrintMessage(raw_ostream &OS, const SMDiagnostic &Diagnostic,
bool ShowColors = true) const;
/// Return an SMDiagnostic at the specified location with the specified
/// string.
///
/// \param Msg If non-null, the kind of message (e.g., "error") which is
/// prefixed to the message.
SMDiagnostic GetMessage(SMLoc Loc, DiagKind Kind, const Twine &Msg,
ArrayRef<SMRange> Ranges = None,
ArrayRef<SMFixIt> FixIts = None) const;
/// Prints the names of included files and the line of the file they were
/// included from. A diagnostic handler can use this before printing its
/// custom formatted message.
///
/// \param IncludeLoc The location of the include.
/// \param OS the raw_ostream to print on.
void PrintIncludeStack(SMLoc IncludeLoc, raw_ostream &OS) const;
};
/// Represents a single fixit, a replacement of one range of text with another.
class SMFixIt {
SMRange Range;
std::string Text;
public:
// FIXME: Twine.str() is not very efficient.
SMFixIt(SMLoc Loc, const Twine &Insertion)
: Range(Loc, Loc), Text(Insertion.str()) {
assert(Loc.isValid());
}
// FIXME: Twine.str() is not very efficient.
SMFixIt(SMRange R, const Twine &Replacement)
: Range(R), Text(Replacement.str()) {
assert(R.isValid());
}
StringRef getText() const { return Text; }
SMRange getRange() const { return Range; }
bool operator<(const SMFixIt &Other) const {
if (Range.Start.getPointer() != Other.Range.Start.getPointer())
return Range.Start.getPointer() < Other.Range.Start.getPointer();
if (Range.End.getPointer() != Other.Range.End.getPointer())
return Range.End.getPointer() < Other.Range.End.getPointer();
return Text < Other.Text;
}
};
/// Instances of this class encapsulate one diagnostic report, allowing
/// printing to a raw_ostream as a caret diagnostic.
class SMDiagnostic {
const SourceMgr *SM;
SMLoc Loc;
std::string Filename;
int LineNo, ColumnNo;
SourceMgr::DiagKind Kind;
std::string Message, LineContents;
std::vector<std::pair<unsigned, unsigned> > Ranges;
SmallVector<SMFixIt, 4> FixIts;
public:
// Null diagnostic.
SMDiagnostic()
: SM(nullptr), LineNo(0), ColumnNo(0), Kind(SourceMgr::DK_Error) {}
// Diagnostic with no location (e.g. file not found, command line arg error).
SMDiagnostic(StringRef filename, SourceMgr::DiagKind Knd, StringRef Msg)
: SM(nullptr), Filename(filename), LineNo(-1), ColumnNo(-1), Kind(Knd),
Message(Msg) {}
// Diagnostic with a location.
SMDiagnostic(const SourceMgr &sm, SMLoc L, StringRef FN,
int Line, int Col, SourceMgr::DiagKind Kind,
StringRef Msg, StringRef LineStr,
ArrayRef<std::pair<unsigned,unsigned> > Ranges,
ArrayRef<SMFixIt> FixIts = None);
const SourceMgr *getSourceMgr() const { return SM; }
SMLoc getLoc() const { return Loc; }
StringRef getFilename() const { return Filename; }
int getLineNo() const { return LineNo; }
int getColumnNo() const { return ColumnNo; }
SourceMgr::DiagKind getKind() const { return Kind; }
StringRef getMessage() const { return Message; }
StringRef getLineContents() const { return LineContents; }
ArrayRef<std::pair<unsigned, unsigned> > getRanges() const {
return Ranges;
}
void addFixIt(const SMFixIt &Hint) {
FixIts.push_back(Hint);
}
ArrayRef<SMFixIt> getFixIts() const {
return FixIts;
}
void print(const char *ProgName, raw_ostream &S, bool ShowColors = true,
bool ShowKindLabel = true) const;
};
} // end llvm namespace
#endif