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perf clang: Use real file system for #include

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Utilize clang's OverlayFileSystem facility, allow CompilerInstance to
access real file system.

With this patch the '#include' directive can be used.

Add a new getModuleFromSource for real file.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Joe Stringer <joe@ovn.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/20161126070354.141764-12-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan 2016-11-26 07:03:35 +00:00 committed by Arnaldo Carvalho de Melo
parent 00b86691c7
commit 77dfa84a84
2 changed files with 35 additions and 12 deletions
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44
tools/perf/util/c++/clang.cpp
View file

@ -15,6 +15,7 @@
#include "clang/Tooling/Tooling.h"
#include "llvm/IR/Module.h"
#include "llvm/Option/Option.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/ManagedStatic.h"
#include <memory>
@ -27,14 +28,6 @@ static std::unique_ptr<llvm::LLVMContext> LLVMCtx;
using namespace clang;
static vfs::InMemoryFileSystem *
buildVFS(StringRef& Name, StringRef& Content)
{
vfs::InMemoryFileSystem *VFS = new vfs::InMemoryFileSystem(true);
VFS->addFile(Twine(Name), 0, llvm::MemoryBuffer::getMemBuffer(Content));
return VFS;
}
static CompilerInvocation *
createCompilerInvocation(StringRef& Path, DiagnosticsEngine& Diags)
{
@ -60,17 +53,17 @@ createCompilerInvocation(StringRef& Path, DiagnosticsEngine& Diags)
return CI;
}
std::unique_ptr<llvm::Module>
getModuleFromSource(StringRef Name, StringRef Content)
static std::unique_ptr<llvm::Module>
getModuleFromSource(StringRef Path,
IntrusiveRefCntPtr<vfs::FileSystem> VFS)
{
CompilerInstance Clang;
Clang.createDiagnostics();
IntrusiveRefCntPtr<vfs::FileSystem> VFS = buildVFS(Name, Content);
Clang.setVirtualFileSystem(&*VFS);
IntrusiveRefCntPtr<CompilerInvocation> CI =
createCompilerInvocation(Name, Clang.getDiagnostics());
createCompilerInvocation(Path, Clang.getDiagnostics());
Clang.setInvocation(&*CI);
std::unique_ptr<CodeGenAction> Act(new EmitLLVMOnlyAction(&*LLVMCtx));
@ -80,6 +73,33 @@ getModuleFromSource(StringRef Name, StringRef Content)
return Act->takeModule();
}
std::unique_ptr<llvm::Module>
getModuleFromSource(StringRef Name, StringRef Content)
{
using namespace vfs;
llvm::IntrusiveRefCntPtr<OverlayFileSystem> OverlayFS(
new OverlayFileSystem(getRealFileSystem()));
llvm::IntrusiveRefCntPtr<InMemoryFileSystem> MemFS(
new InMemoryFileSystem(true));
/*
* pushOverlay helps setting working dir for MemFS. Must call
* before addFile.
*/
OverlayFS->pushOverlay(MemFS);
MemFS->addFile(Twine(Name), 0, llvm::MemoryBuffer::getMemBuffer(Content));
return getModuleFromSource(Name, OverlayFS);
}
std::unique_ptr<llvm::Module>
getModuleFromSource(StringRef Path)
{
IntrusiveRefCntPtr<vfs::FileSystem> VFS(vfs::getRealFileSystem());
return getModuleFromSource(Path, VFS);
}
}
extern "C" {

3
tools/perf/util/c++/clang.h
View file

@ -12,5 +12,8 @@ using namespace llvm;
std::unique_ptr<Module>
getModuleFromSource(StringRef Name, StringRef Content);
std::unique_ptr<Module>
getModuleFromSource(StringRef Path);
}
#endif