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e9b9e6a6c2
Adjust users of MappedFile to its new non-throwing interface. Note that in most cases the lazy step of just throwing after a call to MappedFile was installed. This was done in the name of incremental changes. Getting rid of the new throw statements will take adjustment of interfaces and propagation of errors to higher levels. Those changes will come in subsequent patches. llvm-svn: 29817
98 lines
3.5 KiB
C++
98 lines
3.5 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() {
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std::string ErrMsg;
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if (File.open(Filename, sys::MappedFile::READ_ACCESS, &ErrMsg))
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throw ErrMsg;
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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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