Chris Lattner 11da4cf25c Reimplement MemoryBuffer::getFile with three enhancements: ...

1) stop using MappedFile.
2) if profitable use the sys::path::MapInFilePages api to
   read the file.
3) otherwise fallback to read.

When sys::path::MapInFilePages is implemented, this provides
several benefits:

#1: this avoids fragmenting memory for small files.
#2: this avoids extraneous stat calls when the file size is known.
#3: this only keeps the file descriptor open while reading the 
    file, not for the duration of the lifetime of the memory 
    buffer.  This fixes a serious clang FD 'leak' problem.

I believe that this will work on a win32 machine, but I don't have
one to test on.  I'd appreciate it if someone could check.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49031 91177308-0d34-0410-b5e6-96231b3b80d8

2008-04-01 06:05:21 +00:00

..

Allocator.cpp

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Annotation.cpp

Add explicit keywords.

2008-02-20 16:44:09 +00:00

APFloat.cpp

Add a method to APFloat to convert directly from APInt.

2008-02-29 01:26:11 +00:00

APInt.cpp

A quick nm audit turned up several fixed tables and objects that were

2008-03-25 21:45:14 +00:00

APSInt.cpp

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CommandLine.cpp

Add explicit keywords.

2008-03-25 22:06:05 +00:00

ConstantRange.cpp

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Debug.cpp

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Dwarf.cpp

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FileUtilities.cpp

Change DiffFilesWithTolerance to be written in terms of MemoryBuffer,

2008-04-01 03:39:49 +00:00

FoldingSet.cpp

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GraphWriter.cpp

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IsInf.cpp

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IsNAN.cpp

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Makefile

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ManagedStatic.cpp

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MemoryBuffer.cpp

Reimplement MemoryBuffer::getFile with three enhancements:

2008-04-01 06:05:21 +00:00

PluginLoader.cpp

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SlowOperationInformer.cpp

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SmallPtrSet.cpp

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Statistic.cpp

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Streams.cpp

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StringExtras.cpp

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StringMap.cpp

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StringPool.cpp

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SystemUtils.cpp

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Timer.cpp

…