[llvm-commits] CVS: llvm/lib/VMCore/Function.cpp

[Chris Lattner]

Changes in directory llvm/lib/VMCore:

Function.cpp updated: 1.73 -> 1.74

---
Log message:

Implement new method


---
Diffs of the changes:  (+36 -0)

Index: llvm/lib/VMCore/Function.cpp
diff -u llvm/lib/VMCore/Function.cpp:1.73 llvm/lib/VMCore/Function.cpp:1.74
--- llvm/lib/VMCore/Function.cpp:1.73	Tue Jun 15 16:52:19 2004
+++ llvm/lib/VMCore/Function.cpp	Sun Jul 11 20:17:34 2004
@@ -13,6 +13,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Module.h"
+#include "llvm/Constant.h"
 #include "llvm/DerivedTypes.h"
 #include "llvm/iOther.h"
 #include "llvm/Intrinsics.h"
@@ -81,6 +82,41 @@
     LeakDetector::removeGarbageObject(this);
 }
 
+static bool removeDeadConstantUsers(Constant *C) {
+  while (!C->use_empty()) {
+    if (Constant *C = dyn_cast<Constant>(C->use_back())) {
+      if (!removeDeadConstantUsers(C))
+        return false;  // Constant wasn't dead.
+    } else {
+      return false;    // Nonconstant user of the global.
+    }
+  }
+
+  C->destroyConstant();
+  return true;
+}
+
+
+/// removeDeadConstantUsers - If there are any dead constant users dangling
+/// off of this global value, remove them.  This method is useful for clients
+/// that want to check to see if a global is unused, but don't want to deal
+/// with potentially dead constants hanging off of the globals.
+///
+/// This function returns true if the global value is now dead.  If all 
+/// users of this global are not dead, this method may return false and
+/// leave some of them around.
+bool GlobalValue::removeDeadConstantUsers() {
+  while (!use_empty()) {
+    if (Constant *C = dyn_cast<Constant>(use_back())) {
+      if (!::removeDeadConstantUsers(C))
+        return false;  // Constant wasn't dead.
+    } else {
+      return false;    // Nonconstant user of the global.
+    }
+  }
+  return true;
+}
+
 
 //===----------------------------------------------------------------------===//
 // Function Implementation