Debug flag to print a summary of the inliner's work

Example output below. Note that inlining List.map fails because the
trait forwarder uses `INVOKESPECIAL` for now, will change with pr 5177.

$ cat Test.scala
class C {
  def foo = Map(1 -> 'a', 2 -> 'b')
  def bar(l: List[Int]) = l.map(_ + 1)
}

$ qsc -Yopt-log-inline _ -Yopt:l:classpath Test.scala
Inlining into C.foo (initially 36 instructions, ultimately 72):
  - Inlined scala/Predef$ArrowAssoc$.$minus$greater$extension (8 instructions) 2 times: the callee is annotated `@inline`

Inlining into C.bar (initially 12 instructions, ultimately 12):
  - Failed to inline scala/collection/immutable/List.map (the callee is a higher-order method, the argument for parameter (bf: Function1) is a function literal): The callee scala/collection/immutable/List::map(Lscala/Function1;Lscala/collection/generic/CanBuildFrom;)Ljava/lang/Object; contains the instruction INVOKESPECIAL scala/collection/TraversableLike.map (Lscala/Function1;Lscala/collection/generic/CanBuildFrom;)Ljava/lang/Object;
that would cause an IllegalAccessError when inlined into class C.

1 files changed, 5 insertions, 5 deletions

diff --git a/test/junit/scala/tools/nsc/backend/jvm/opt/InlinerTest.scala b/test/junit/scala/tools/nsc/backend/jvm/opt/InlinerTest.scala
index fd020c7d93..fb708c4f29 100644
--- a/test/junit/scala/tools/nsc/backend/jvm/opt/InlinerTest.scala
+++ b/test/junit/scala/tools/nsc/backend/jvm/opt/InlinerTest.scala
@@ -72,7 +72,7 @@ class InlinerTest extends BytecodeTesting {
 
   def inlineTest(code: String, mod: ClassNode => Unit = _ => ()): MethodNode = {
     val (gMethod, fCall) = gMethAndFCallsite(code, mod)
-    inliner.inline(InlineRequest(fCall, Nil))
+    inliner.inline(InlineRequest(fCall, Nil, null))
     gMethod
   }
 
@@ -343,7 +343,7 @@ class InlinerTest extends BytecodeTesting {
     val warning = inliner.canInlineBody(call)
     assert(warning.isEmpty, warning)
 
-    inliner.inline(InlineRequest(call, Nil))
+    inliner.inline(InlineRequest(call, Nil, null))
     val ins = instructionsFromMethod(fMeth)
 
     // no invocations, lowestOneBit is inlined
@@ -976,7 +976,7 @@ class InlinerTest extends BytecodeTesting {
 
     inliner.inline(InlineRequest(hCall,
       post = List(InlineRequest(gCall,
-        post = List(InlineRequest(fCall, Nil))))))
+        post = List(InlineRequest(fCall, Nil, null)), null)), null))
     assertNoInvoke(convertMethod(iMeth)) // no invoke in i: first h is inlined, then the inlined call to g is also inlined, etc for f
     assertInvoke(convertMethod(gMeth), "C", "f") // g itself still has the call to f
   }
@@ -998,11 +998,11 @@ class InlinerTest extends BytecodeTesting {
     val bCall = getCallsite(c, "b")
     val cCall = getCallsite(d, "c")
 
-    inliner.inline(InlineRequest(bCall, Nil))
+    inliner.inline(InlineRequest(bCall, Nil, null))
 
     val req = InlineRequest(cCall,
       List(InlineRequest(bCall,
-        List(InlineRequest(aCall, Nil)))))
+        List(InlineRequest(aCall, Nil, null)), null)), null)
     inliner.inline(req)
 
     assertNoInvoke(convertMethod(d))