Revised macro defs, added a test case.

src/compiler/scala/reflect/internal/Flags.scala

@@ -220,7 +220,7 @@ class Flags extends ModifierFlags {
 
   /** These modifiers appear in TreePrinter output. */
   final val PrintableFlags: Long =
-    ExplicitFlags | LOCAL | SYNTHETIC | STABLE | CASEACCESSOR |
+    ExplicitFlags | LOCAL | SYNTHETIC | STABLE | CASEACCESSOR | MACRO |
     ACCESSOR | SUPERACCESSOR | PARAMACCESSOR | BRIDGE | STATIC | VBRIDGE | SPECIALIZED
 
   /** The two bridge flags */
@@ -352,7 +352,7 @@ class Flags extends ModifierFlags {
     case             MUTABLE => "<mutable>"                           // (1L << 12)
     case               PARAM => "<param>"                             // (1L << 13)
     case             PACKAGE => "<package>"                           // (1L << 14)
-    case             0x8000L => ""                                    // (1L << 15)
+    case               MACRO => "macro"                               // (1L << 15)
     case         BYNAMEPARAM => "<bynameparam/captured/covariant>"    // (1L << 16)
     case       CONTRAVARIANT => "<contravariant/inconstructor/label>" // (1L << 17)
     case         ABSOVERRIDE => "absoverride"                         // (1L << 18)

src/compiler/scala/tools/nsc/typechecker/Macros.scala

@@ -7,13 +7,14 @@ trait Macros { self: Analyzer =>
   import global._
   import definitions._
 
-  def macroMethName(name: Name) =
-    newTermName((if (name.isTypeName) "type" else "def") + "macro$" + name)
+  def macroMethName(sym: Symbol) =
+    newTermName((if (sym.name.isTypeName) "type" else "def") + "macro$" +
+                (if (sym.owner.isModuleClass) "obj$" else "cls$") + sym.name)
 
   def macroMeth(mac: Symbol): Symbol = {
     var owner = mac.owner
     if (!owner.isModuleClass) owner = owner.companionModule.moduleClass
-    owner.info.decl(macroMethName(mac.name))
+    owner.info.decl(macroMethName(mac))
   }
 
   /**
@@ -46,20 +47,22 @@ trait Macros { self: Analyzer =>
       Block(List(ValDef(Modifiers(IMPLICIT), "$glob", universeType, Ident("glob"))), tree)
     }
 
-    treeCopy.DefDef(
-      mdef,
-      mods = mdef.mods &~ MACRO,
-      name = mdef.name.toTermName,
-      tparams = List(),
-      vparamss = List(globParam) :: List(thisParam) :: (mdef.tparams map tparamInMacro) ::
-        (mdef.vparamss map (_ map vparamInMacro)),
-      tpt = globTree,
-      wrapImplicit(mdef.rhs))
+    atPos(mdef.pos) {
+      new DefDef( // can't call DefDef here; need to find out why
+        mods = mdef.mods &~ MACRO,
+        name = macroMethName(mdef.symbol),
+        tparams = List(),
+        vparamss = List(globParam) :: List(thisParam) :: (mdef.tparams map tparamInMacro) ::
+          (mdef.vparamss map (_ map vparamInMacro)),
+        tpt = globTree,
+        wrapImplicit(mdef.rhs))
+    }
   }
 
   def addMacroMethods(templ: Template, namer: Namer): Unit = {
     for (ddef @ DefDef(mods, _, _, _, _, _) <- templ.body if mods hasFlag MACRO) {
-      namer.enterSyntheticSym(macroMethDef(ddef))
+      val sym = namer.enterSyntheticSym(util.trace("macro def: ")(macroMethDef(ddef)))
+      println("added to "+namer.context.owner.enclClass+": "+sym)
     }
   }
 

src/compiler/scala/tools/nsc/typechecker/Namers.scala

@@ -783,8 +783,11 @@ trait Namers extends MethodSynthesis {
       val typedBody = defnTyper.computeType(tree.rhs, pt)
       val sym       = if (owner.isMethod) owner else tree.symbol
       val typedDefn = widenIfNecessary(sym, typedBody, pt)
+      assignTypeToTree(tree, typedDefn)
+    }
 
-      tree.tpt defineType typedDefn setPos tree.pos.focus
+    private def assignTypeToTree(tree: ValOrDefDef, tpe: Type): Type = {
+      tree.tpt defineType tpe setPos tree.pos.focus
       tree.tpt.tpe
     }
 
@@ -1003,7 +1006,7 @@ trait Namers extends MethodSynthesis {
           if (!tpt.isEmpty) {
             typer.typedType(tpt).tpe
           } else if (meth.isMacro) {
-            AnyClass.tpe
+            assignTypeToTree(ddef, AnyClass.tpe)
           } else {
             // replace deSkolemized symbols with skolemized ones
             // (for resultPt computed by looking at overridden symbol, right?)

src/compiler/scala/tools/nsc/typechecker/RefChecks.scala

@@ -1225,6 +1225,7 @@ abstract class RefChecks extends InfoTransform with reflect.internal.transform.R
           List(tree1)
         }
       case Import(_, _) => Nil
+      case DefDef(mods, _, _, _, _, _) if (mods hasFlag MACRO) => Nil
       case _            => List(transform(tree))
     }
 

src/compiler/scala/tools/nsc/typechecker/Typers.scala

@@ -1676,7 +1676,6 @@ trait Typers extends Modes with Adaptations with PatMatVirtualiser {
      */
     def typedDefDef(ddef: DefDef): DefDef = {
       val meth = ddef.symbol.initialize
-      if (meth.isMacro) return ddef
 
       reenterTypeParams(ddef.tparams)
       reenterValueParams(ddef.vparamss)
@@ -1712,6 +1711,8 @@ trait Typers extends Modes with Adaptations with PatMatVirtualiser {
                meth.owner.isAnonOrRefinementClass))
             error(ddef.pos, "constructor definition not allowed here")
           typed(ddef.rhs)
+        } else if (meth.isMacro) {
+          EmptyTree
         } else {
           transformedOrTyped(ddef.rhs, EXPRmode, tpt1.tpe)
         }
@@ -3444,7 +3445,7 @@ trait Typers extends Modes with Adaptations with PatMatVirtualiser {
                 // (calling typed1 more than once for the same tree)
                 if (checked ne res) typed { atPos(tree.pos)(checked) }
                 else res
-              } else if (fun2.hasSymbol && fun2.symbol.isMacro)
+              } else if ((mode & FUNmode) == 0 && fun2.hasSymbol && fun2.symbol.isMacro)
                 typed1(macroExpand(res), mode, pt)
               else
                 res

test/files/pos/macros.flags

@@ -0,0 +1 @@
+-Xexperimental

test/files/pos/macros.scala

@@ -0,0 +1,10 @@
+object Test {
+
+  class C { 
+    def macro foo[T](xs: List[T]): T = (T, xs) match {
+      case (t1: glob.Type, t2: glob.Tree) => t2
+    }
+  }
+}
+
+