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[Support] Add MemoryBuffer::getFileSlice()

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mach-o supports "fat" files which are a header/table-of-contents followed by a
concatenation of mach-o files built for different architectures. Currently, 
MemoryBuffer has no easy way to map a subrange (slice) of a file which lld
will need to select a mach-o slice of a fat file. The new function provides 
an easy way to map a slice of a file into a MemoryBuffer. Test case included.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219260 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Kledzik
2014-10-08 00:22:18 +00:00
parent a29287d90d
commit 52688c3aff
3 changed files with 69 additions and 8 deletions
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4
include/llvm/Support/MemoryBuffer.h
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@@ -126,6 +126,10 @@ public:
static ErrorOr<std::unique_ptr<MemoryBuffer>>
getFileOrSTDIN(const Twine &Filename, int64_t FileSize = -1);
/// Map a subrange of the the specified file as a MemoryBuffer.
static ErrorOr<std::unique_ptr<MemoryBuffer>>
getFileSlice(const Twine &Filename, uint64_t MapSize, uint64_t Offset);
//===--------------------------------------------------------------------===//
// Provided for performance analysis.
//===--------------------------------------------------------------------===//