Don't open the file again in the gold plugin. To be able to do this, update

MemoryBuffer::getOpenFile to not close the file descriptor.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125128 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 23 insertions, 0 deletions

diff --git a/tools/lto/LTOModule.cpp b/tools/lto/LTOModule.cpp
index e2ecabcc1c..ca937bf2ff 100644
--- a/tools/lto/LTOModule.cpp
+++ b/tools/lto/LTOModule.cpp
@@ -87,6 +87,17 @@ LTOModule *LTOModule::makeLTOModule(const char *path,
   return makeLTOModule(buffer.get(), errMsg);
 }
 
+LTOModule *LTOModule::makeLTOModule(int fd, const char *path,
+                                    off_t size,
+                                    std::string &errMsg) {
+  OwningPtr<MemoryBuffer> buffer;
+  if (error_code ec = MemoryBuffer::getOpenFile(fd, path, buffer, size)) {
+    errMsg = ec.message();
+    return NULL;
+  }
+  return makeLTOModule(buffer.get(), errMsg);
+}
+
 /// makeBuffer - Create a MemoryBuffer from a memory range.  MemoryBuffer
 /// requires the byte past end of the buffer to be a zero.  We might get lucky
 /// and already be that way, otherwise make a copy.  Also if next byte is on a
diff --git a/tools/lto/LTOModule.h b/tools/lto/LTOModule.h
index a19acc0d73..1794d81c0a 100644
--- a/tools/lto/LTOModule.h
+++ b/tools/lto/LTOModule.h
@@ -51,6 +51,9 @@ struct LTOModule {
 
     static LTOModule*        makeLTOModule(const char* path,
                                           std::string& errMsg);
+    static LTOModule*        makeLTOModule(int fd, const char *path,
+                                           off_t size,
+                                           std::string& errMsg);
     static LTOModule*        makeLTOModule(const void* mem, size_t length,
                                            std::string& errMsg);
 
diff --git a/tools/lto/lto.cpp b/tools/lto/lto.cpp
index 75b40f4287..7d4871d925 100644
--- a/tools/lto/lto.cpp
+++ b/tools/lto/lto.cpp
@@ -91,6 +91,14 @@ lto_module_t lto_module_create(const char* path)
      return LTOModule::makeLTOModule(path, sLastErrorString);
 }
 
+//
+// loads an object file from disk
+// returns NULL on error (check lto_get_error_message() for details)
+//
+lto_module_t lto_module_create_from_fd(int fd, const char *path, off_t size)
+{
+     return LTOModule::makeLTOModule(fd, path, size, sLastErrorString);
+}
 
 //
 // loads an object file from memory 
diff --git a/tools/lto/lto.exports b/tools/lto/lto.exports
index 4dbf760d38..a3740911ed 100644
--- a/tools/lto/lto.exports
+++ b/tools/lto/lto.exports
@@ -1,6 +1,7 @@
 lto_get_error_message
 lto_get_version
 lto_module_create
+lto_module_create_from_fd
 lto_module_create_from_memory
 lto_module_get_num_symbols
 lto_module_get_symbol_attribute