diff options
| -rw-r--r-- | lib/VMCore/Function.cpp | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/lib/VMCore/Function.cpp b/lib/VMCore/Function.cpp index 82f3645..79384f9 100644 --- a/lib/VMCore/Function.cpp +++ b/lib/VMCore/Function.cpp @@ -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 @@ void Argument::setParent(Function *parent) { 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 |