Stub out a new lazy value info pass, which will eventually

vend value constraint information to the optimizer.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86767 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 50 insertions, 0 deletions

diff --git a/include/llvm/Analysis/LazyValueInfo.h b/include/llvm/Analysis/LazyValueInfo.h
new file mode 100644
index 0000000..29f8180
--- /dev/null
+++ b/include/llvm/Analysis/LazyValueInfo.h
@@ -0,0 +1,43 @@
+//===- LazyValueInfo.h - Value constraint analysis --------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the interface for lazy computation of value constraint
+// information.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_LIVEVALUES_H
+#define LLVM_ANALYSIS_LIVEVALUES_H
+
+#include "llvm/Pass.h"
+
+namespace llvm {
+
+/// LazyValueInfo - This pass computes, caches, and vends lazy value constraint
+/// information.
+class LazyValueInfo : public FunctionPass {
+public:
+  static char ID;
+  LazyValueInfo();
+
+  virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+    AU.setPreservesAll();
+  }
+  virtual void releaseMemory();
+  
+  virtual bool runOnFunction(Function &F) {
+    // Fully lazy.
+    return false;
+  }
+};
+
+}  // end namespace llvm
+
+#endif
+
diff --git a/include/llvm/Analysis/Passes.h b/include/llvm/Analysis/Passes.h
index 66ab3ea..b222321 100644
--- a/include/llvm/Analysis/Passes.h
+++ b/include/llvm/Analysis/Passes.h
@@ -139,6 +139,12 @@ namespace llvm {
   // createLiveValuesPass - This creates an instance of the LiveValues pass.
   //
   FunctionPass *createLiveValuesPass();
+  
+  //===--------------------------------------------------------------------===//
+  //
+  /// createLazyValueInfoPass - This creates an instance of the LazyValueInfo
+  /// pass.
+  FunctionPass *createLazyValueInfoPass();
 
   //===--------------------------------------------------------------------===//
   //
diff --git a/include/llvm/LinkAllPasses.h b/include/llvm/LinkAllPasses.h
index bcb98c1..c88e954 100644
--- a/include/llvm/LinkAllPasses.h
+++ b/include/llvm/LinkAllPasses.h
@@ -82,6 +82,7 @@ namespace {
       (void) llvm::createInternalizePass(false);
       (void) llvm::createLCSSAPass();
       (void) llvm::createLICMPass();
+      (void) llvm::createLazyValueInfoPass();
       (void) llvm::createLiveValuesPass();
       (void) llvm::createLoopDependenceAnalysisPass();
       (void) llvm::createLoopExtractorPass();