Added ## method to Any as our scala hashCode me...

Added ## method to Any as our scala hashCode method which provides
consistent answers for primitive types. And I'm sure we're all tired of
new starrs, but it's hard to add a method to Any without one. This patch
only brings ## into existence, but nothing calls it yet.

// some true assertions
scala> assert(5.5f.## == 5.5f.hashCode)
scala> assert(5.0f.## != 5.0f.hashCode && 5.0f.## == 5L.##)

No review.  (Already reviewed by odersky.)

1 files changed, 15 insertions, 0 deletions

diff --git a/src/compiler/scala/tools/nsc/backend/icode/GenICode.scala b/src/compiler/scala/tools/nsc/backend/icode/GenICode.scala
index 048d0b7bec..35a5f80d1f 100644
--- a/src/compiler/scala/tools/nsc/backend/icode/GenICode.scala
+++ b/src/compiler/scala/tools/nsc/backend/icode/GenICode.scala
@@ -423,6 +423,8 @@ abstract class GenICode extends SubComponent  {
         genArithmeticOp(tree, ctx, code)
       else if (code == scalaPrimitives.CONCAT)
         (genStringConcat(tree, ctx), STRING)
+      else if (code == scalaPrimitives.HASH)
+        (genScalaHash(receiver, ctx), INT)
       else if (isArrayOp(code))
         genArrayOp(tree, ctx, code, expectedType)
       else if (isLogicalOp(code) || isComparisonOp(code)) {
@@ -1167,6 +1169,19 @@ abstract class GenICode extends SubComponent  {
       ctx1
     }
 
+    /** Generate the scala ## method.
+     */
+    def genScalaHash(tree: Tree, ctx: Context): Context = {
+      val hashMethod = {
+        ctx.bb.emit(LOAD_MODULE(definitions.ScalaRunTimeModule))
+        definitions.getMember(definitions.ScalaRunTimeModule, "hash")
+      }
+
+      val ctx1 = genLoad(tree, ctx, ANY_REF_CLASS)
+      ctx1.bb.emit(CALL_METHOD(hashMethod, Static(false)))
+      ctx1
+    }
+
     /**
      * Returns a list of trees that each should be concatenated, from
      * left to right. It turns a chained call like "a".+("b").+("c") into