Be lazy about loading metadata in IRObjectFile.

This speeds up llvm-ar building lib64/libclangSema.a with debug IR files
from 8.658015807 seconds to just 0.351036519 seconds :-)

llvm-svn: 232221

6 files changed, 15 insertions, 2 deletions

diff --git a/llvm/include/llvm/IR/GVMaterializer.h b/llvm/include/llvm/IR/GVMaterializer.h
index 6f57dc2a98a..ae2f2e1aefb 100644
--- a/llvm/include/llvm/IR/GVMaterializer.h
+++ b/llvm/include/llvm/IR/GVMaterializer.h
@@ -53,6 +53,8 @@ public:
   ///
   virtual std::error_code MaterializeModule(Module *M) = 0;
 
+  virtual std::error_code materializeMetadata() = 0;
+
   virtual std::vector<StructType *> getIdentifiedStructTypes() const = 0;
 };
 
diff --git a/llvm/include/llvm/IR/Module.h b/llvm/include/llvm/IR/Module.h
index 698e8747495..ac60c8e885e 100644
--- a/llvm/include/llvm/IR/Module.h
+++ b/llvm/include/llvm/IR/Module.h
@@ -502,6 +502,8 @@ public:
   /// Materializer.
   std::error_code materializeAllPermanently();
 
+  std::error_code materializeMetadata();
+
 /// @}
 /// @name Direct access to the globals list, functions list, and symbol table
 /// @{
diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.h b/llvm/lib/Bitcode/Reader/BitcodeReader.h
index 0a69148d84d..27e8b2e2111 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.h
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.h
@@ -255,7 +255,7 @@ public:
   static uint64_t decodeSignRotatedValue(uint64_t V);
 
   /// Materialize any deferred Metadata block.
-  std::error_code materializeMetadata();
+  std::error_code materializeMetadata() override;
 
 private:
   std::vector<StructType *> IdentifiedStructTypes;
diff --git a/llvm/lib/IR/Module.cpp b/llvm/lib/IR/Module.cpp
index 3a88db9754a..3e8f91fee74 100644
--- a/llvm/lib/IR/Module.cpp
+++ b/llvm/lib/IR/Module.cpp
@@ -413,6 +413,12 @@ std::error_code Module::materializeAllPermanently() {
   return std::error_code();
 }
 
+std::error_code Module::materializeMetadata() {
+  if (!Materializer)
+    return std::error_code();
+  return Materializer->materializeMetadata();
+}
+
 //===----------------------------------------------------------------------===//
 // Other module related stuff.
 //
diff --git a/llvm/lib/Object/IRObjectFile.cpp b/llvm/lib/Object/IRObjectFile.cpp
index 6369d8befd1..58c4ca312e8 100644
--- a/llvm/lib/Object/IRObjectFile.cpp
+++ b/llvm/lib/Object/IRObjectFile.cpp
@@ -300,7 +300,9 @@ llvm::object::IRObjectFile::create(MemoryBufferRef Object,
   std::unique_ptr<MemoryBuffer> Buff(
       MemoryBuffer::getMemBuffer(BCOrErr.get(), false));
 
-  ErrorOr<Module *> MOrErr = getLazyBitcodeModule(std::move(Buff), Context);
+  ErrorOr<Module *> MOrErr =
+      getLazyBitcodeModule(std::move(Buff), Context, nullptr,
+                           /*ShouldLazyLoadMetadata*/ true);
   if (std::error_code EC = MOrErr.getError())
     return EC;
 
diff --git a/llvm/tools/gold/gold-plugin.cpp b/llvm/tools/gold/gold-plugin.cpp
index f7379ea314a..8decc8ea6d5 100644
--- a/llvm/tools/gold/gold-plugin.cpp
+++ b/llvm/tools/gold/gold-plugin.cpp
@@ -598,6 +598,7 @@ getModuleForFile(LLVMContext &Context, claimed_file &F,
 
   Module &M = Obj.getModule();
 
+  M.materializeMetadata();
   UpgradeDebugInfo(M);
 
   SmallPtrSet<GlobalValue *, 8> Used;