Derive MDNode from MetadataBase instead of Constant. Emit MDNodes into METADATA_BLOCK...

[oota-llvm.git] / include / llvm / ModuleProvider.h

diff --git a/include/llvm/ModuleProvider.h b/include/llvm/ModuleProvider.h
index 8d4b1d23af5c26948d6b14057307cc6110930e4c..8a0a20c0ef6681ae286c33039b73b4159ed7634d 100644 (file)
--- a/include/llvm/ModuleProvider.h
+++ b/include/llvm/ModuleProvider.h
@@ -1,10 +1,10 @@
 //===-- llvm/ModuleProvider.h - Interface for module providers --*- C++ -*-===//
-// 
+//
 //                     The LLVM Compiler Infrastructure
 //
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-// 
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
 //===----------------------------------------------------------------------===//
 //
 // This file provides an abstract interface for loading a module from some
@@ -18,6 +18,10 @@
 #ifndef MODULEPROVIDER_H
 #define MODULEPROVIDER_H
 
+#include <string>
+
+namespace llvm {
+
 class Function;
 class Module;
 
@@ -33,23 +37,52 @@ public:
   ///
   Module* getModule() { return TheModule; }
 
-  /// materializeFunction - make sure the given function is fully read.
+  /// materializeFunction - make sure the given function is fully read.  If the
+  /// module is corrupt, this returns true and fills in the optional string
+  /// with information about the problem.  If successful, this returns false.
   ///
-  virtual void materializeFunction(Function *F) = 0;
+  virtual bool materializeFunction(Function *F, std::string *ErrInfo = 0) = 0;
 
+  /// dematerializeFunction - If the given function is read in, and if the
+  /// module provider supports it, release the memory for the function, and set
+  /// it up to be materialized lazily.  If the provider doesn't support this
+  /// capability, this method is a noop.
+  ///
+  virtual void dematerializeFunction(Function *) {}
+  
   /// materializeModule - make sure the entire Module has been completely read.
+  /// On error, return null and fill in the error string if specified.
   ///
-  Module* materializeModule();
+  virtual Module* materializeModule(std::string *ErrInfo = 0) = 0;
 
   /// releaseModule - no longer delete the Module* when provider is destroyed.
+  /// On error, return null and fill in the error string if specified.
   ///
-  virtual Module* releaseModule() { 
+  virtual Module* releaseModule(std::string *ErrInfo = 0) {
     // Since we're losing control of this Module, we must hand it back complete
-    materializeModule();
-    Module *tempM = TheModule; 
-    TheModule = 0; 
-    return tempM; 
+    if (!materializeModule(ErrInfo))
+      return 0;
+    Module *tempM = TheModule;
+    TheModule = 0;
+    return tempM;
   }
 };
 
+
+/// ExistingModuleProvider - Allow conversion from a fully materialized Module
+/// into a ModuleProvider, allowing code that expects a ModuleProvider to work
+/// if we just have a Module.  Note that the ModuleProvider takes ownership of
+/// the Module specified.
+struct ExistingModuleProvider : public ModuleProvider {
+  explicit ExistingModuleProvider(Module *M) {
+    TheModule = M;
+  }
+  bool materializeFunction(Function *, std::string * = 0) {
+    return false;
+  }
+  Module* materializeModule(std::string * = 0) { return TheModule; }
+};
+
+} // End llvm namespace
+
 #endif