[llvm-commits] [llvm] r97214 - /llvm/trunk/utils/TableGen/DAGISelMatcher.h

[Chris Lattner]

Author: lattner
Date: Fri Feb 26 01:35:27 2010
New Revision: 97214

URL: http://llvm.org/viewvc/llvm-project?rev=97214&view=rev
Log:
add a new setNumChildren method for resizing scopes.  Tweak getHash() so
that we never return a tombstone value, which (thankfully) triggers an
assert in densemap.

Modified:
    llvm/trunk/utils/TableGen/DAGISelMatcher.h

Modified: llvm/trunk/utils/TableGen/DAGISelMatcher.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/TableGen/DAGISelMatcher.h?rev=97214&r1=97213&r2=97214&view=diff
==============================================================================
--- llvm/trunk/utils/TableGen/DAGISelMatcher.h (original)
+++ llvm/trunk/utils/TableGen/DAGISelMatcher.h Fri Feb 26 01:35:27 2010
@@ -100,7 +100,8 @@
   }
   
   unsigned getHash() const {
-    return (getHashImpl() << 4) ^ getKind();
+    // Clear the high bit so we don't conflict with tombstones etc.
+    return ((getHashImpl() << 4) ^ getKind()) & (~0U>>1);
   }
   
   void print(raw_ostream &OS, unsigned indent = 0) const;
@@ -137,6 +138,15 @@
     Children[i] = 0;
     return Res;
   }
+  
+  void setNumChildren(unsigned NC) {
+    if (NC < Children.size()) {
+      // delete any children we're about to lose pointers to.
+      for (unsigned i = NC, e = Children.size(); i != e; ++i)
+        delete Children[i];
+    }
+    Children.resize(NC);
+  }
 
   static inline bool classof(const Matcher *N) {
     return N->getKind() == Scope;