LazyVals phase.

Creates accessors for lazy vals:
1) lazy local vals are rewritten to dotty.runtime.Lazy*** holders
2) for a non-volatile field lazy val create a non-thread-safe accessor and flag:
2.a) if lazy val type indicates that val is not nullable, uses null value as a flag
2.b) else uses boolean flag for sake of performance, method size, and
allowing more jvm optimizations
3) for a volatile field lazy val use double locking scheme, that guaranties no
spurious deadlocks, using long bits as bitmaps and creating companion
objects to store offsets needed for unsafe methods.

Conflicts:
	test/dotc/tests.scala

1 files changed, 1 insertions, 0 deletions

diff --git a/src/dotty/tools/dotc/core/StdNames.scala b/src/dotty/tools/dotc/core/StdNames.scala
index e7c04e846..0cbcfa5a7 100644
--- a/src/dotty/tools/dotc/core/StdNames.scala
+++ b/src/dotty/tools/dotc/core/StdNames.scala
@@ -221,6 +221,7 @@ object StdNames {
     val FAKE_LOCAL_THIS: N          = "this$"
     val IMPLCLASS_CONSTRUCTOR: N    = "$init$"
     val LAZY_LOCAL: N               = "$lzy"
+    val LAZY_FIELD_OFFSET: N        = "OFFSET$"
     val LAZY_SLOW_SUFFIX: N         = "$lzycompute"
     val LOCAL_SUFFIX: N             = " "
     val UNIVERSE_BUILD_PREFIX: N    = "$u.build."