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Don't own the buffer in object::Binary.

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Owning the buffer is somewhat inflexible. Some Binaries have sub Binaries
(like Archive) and we had to create dummy buffers just to handle that. It is
also a bad fit for IRObjectFile where the Module wants to own the buffer too.

Keeping this ownership would make supporting IR inside native objects
particularly painful.

This patch focuses in lib/Object. If something elsewhere used to own an Binary,
now it also owns a MemoryBuffer.

This patch introduces a few new types.

* MemoryBufferRef. This is just a pair of StringRefs for the data and name.
  This is to MemoryBuffer as StringRef is to std::string.
* OwningBinary. A combination of Binary and a MemoryBuffer. This is needed
  for convenience functions that take a filename and return both the
  buffer and the Binary using that buffer.

The C api now uses OwningBinary to avoid any change in semantics. I will start
a new thread to see if we want to change it and how.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216002 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2014-08-19 18:44:46 +00:00
parent 2ac376ba34
commit 548f2b6e8f
48 changed files with 375 additions and 314 deletions
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7
tools/llvm-dwarfdump/llvm-dwarfdump.cpp
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@@ -66,16 +66,17 @@ DumpType("debug-dump", cl::init(DIDT_All),
clEnumValEnd));
static void DumpInput(const StringRef &Filename) {
ErrorOr<std::unique_ptr<MemoryBuffer>> Buff =
ErrorOr<std::unique_ptr<MemoryBuffer>> BuffOrErr =
MemoryBuffer::getFileOrSTDIN(Filename);
if (std::error_code EC = Buff.getError()) {
if (std::error_code EC = BuffOrErr.getError()) {
errs() << Filename << ": " << EC.message() << "\n";
return;
}
std::unique_ptr<MemoryBuffer> Buff = std::move(BuffOrErr.get());
ErrorOr<std::unique_ptr<ObjectFile>> ObjOrErr =
ObjectFile::createObjectFile(Buff.get());
ObjectFile::createObjectFile(Buff->getMemBufferRef());
if (std::error_code EC = ObjOrErr.getError()) {
errs() << Filename << ": " << EC.message() << '\n';
return;