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authorChris Lattner <sabre@nondot.org>2004-07-12 01:17:34 +0000
committerChris Lattner <sabre@nondot.org>2004-07-12 01:17:34 +0000
commit1c2fe3148333d023a37fdbe54192631258a85f76 (patch)
tree4a8295443b1a71405753dd40923b28238ced1f1d /lib/VMCore
parent0d88616c9a8d48b6d2f3f7e9b645f2807d3d4774 (diff)
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Implement new method
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14767 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/VMCore')
-rw-r--r--lib/VMCore/Function.cpp36
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