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95 lines
3.4 KiB
C++
95 lines
3.4 KiB
C++
//===- SourceFile.h - Class to represent a source code file -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the SourceFile class which is used to represent a single
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// file of source code in the program, caching data from the file to make access
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// efficient.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_DEBUGGER_SOURCEFILE_H
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#define LLVM_DEBUGGER_SOURCEFILE_H
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#include "llvm/System/Path.h"
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#include "llvm/System/MappedFile.h"
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#include <vector>
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namespace llvm {
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class GlobalVariable;
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class SourceFile {
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/// Filename - This is the full path of the file that is loaded.
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///
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sys::Path Filename;
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/// Descriptor - The debugging descriptor for this source file. If there
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/// are multiple descriptors for the same file, this is just the first one
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/// encountered.
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///
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const GlobalVariable *Descriptor;
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/// This is the memory mapping for the file so we can gain access to it.
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sys::MappedFile File;
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/// LineOffset - This vector contains a mapping from source line numbers to
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/// their offsets in the file. This data is computed lazily, the first time
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/// it is asked for. If there are zero elements allocated in this vector,
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/// then it has not yet been computed.
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mutable std::vector<unsigned> LineOffset;
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public:
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/// SourceFile constructor - Read in the specified source file if it exists,
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/// but do not build the LineOffsets table until it is requested. This will
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/// NOT throw an exception if the file is not found, if there is an error
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/// reading it, or if the user cancels the operation. Instead, it will just
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/// be an empty source file.
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SourceFile(const std::string &fn, const GlobalVariable *Desc)
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: Filename(fn), Descriptor(Desc), File(Filename) {
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readFile();
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}
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~SourceFile() {
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File.unmap();
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}
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/// getDescriptor - Return the debugging decriptor for this source file.
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///
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const GlobalVariable *getDescriptor() const { return Descriptor; }
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/// getFilename - Return the fully resolved path that this file was loaded
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/// from.
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const std::string &getFilename() const { return Filename.toString(); }
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/// getSourceLine - Given a line number, return the start and end of the
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/// line in the file. If the line number is invalid, or if the file could
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/// not be loaded, null pointers are returned for the start and end of the
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/// file. Note that line numbers start with 0, not 1. This also strips off
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/// any newlines from the end of the line, to ease formatting of the text.
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void getSourceLine(unsigned LineNo, const char *&LineStart,
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const char *&LineEnd) const;
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/// getNumLines - Return the number of lines the source file contains.
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///
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unsigned getNumLines() const {
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if (LineOffset.empty()) calculateLineOffsets();
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return LineOffset.size();
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}
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private:
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/// readFile - Load Filename into memory
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///
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void readFile();
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/// calculateLineOffsets - Compute the LineOffset vector for the current
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/// file.
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void calculateLineOffsets() const;
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};
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} // end namespace llvm
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#endif
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