diff options
Diffstat (limited to 'src/compiler/scala/tools/nsc/backend/jvm/opt/InlineInfoAttribute.scala')
| -rw-r--r-- | src/compiler/scala/tools/nsc/backend/jvm/opt/InlineInfoAttribute.scala | 75 |
1 files changed, 45 insertions, 30 deletions
diff --git a/src/compiler/scala/tools/nsc/backend/jvm/opt/InlineInfoAttribute.scala b/src/compiler/scala/tools/nsc/backend/jvm/opt/InlineInfoAttribute.scala index e7dd5abc57..7bc4ea2392 100644 --- a/src/compiler/scala/tools/nsc/backend/jvm/opt/InlineInfoAttribute.scala +++ b/src/compiler/scala/tools/nsc/backend/jvm/opt/InlineInfoAttribute.scala @@ -27,7 +27,7 @@ import scala.tools.nsc.backend.jvm.BackendReporting.UnknownScalaInlineInfoVersio * In principle we could encode the InlineInfo into a Java annotation (instead of a classfile attribute). * However, an attribute allows us to save many bits. In particular, note that the strings in an * InlineInfo are serialized as references to constants in the constant pool, and those strings - * (traitImplClassSelfType, method names, method signatures) would exist in there anyway. So the + * (method names, method signatures) would exist in there anyway. So the * ScalaInlineAttribute remains relatively compact. */ case class InlineInfoAttribute(inlineInfo: InlineInfo) extends Attribute(InlineInfoAttribute.attributeName) { @@ -47,13 +47,16 @@ case class InlineInfoAttribute(inlineInfo: InlineInfo) extends Attribute(InlineI result.putByte(InlineInfoAttribute.VERSION) - var hasSelfIsFinal = 0 - if (inlineInfo.isEffectivelyFinal) hasSelfIsFinal |= 1 - if (inlineInfo.traitImplClassSelfType.isDefined) hasSelfIsFinal |= 2 - result.putByte(hasSelfIsFinal) + var flags = 0 + if (inlineInfo.isEffectivelyFinal) flags |= 1 + // flags |= 2 // no longer written + if (inlineInfo.sam.isDefined) flags |= 4 + result.putByte(flags) - for (selfInternalName <- inlineInfo.traitImplClassSelfType) { - result.putShort(cw.newUTF8(selfInternalName)) + for (samNameDesc <- inlineInfo.sam) { + val (name, desc) = samNameDesc.span(_ != '(') + result.putShort(cw.newUTF8(name)) + result.putShort(cw.newUTF8(desc)) } // The method count fits in a short (the methods_count in a classfile is also a short) @@ -68,10 +71,10 @@ case class InlineInfoAttribute(inlineInfo: InlineInfo) extends Attribute(InlineI result.putShort(cw.newUTF8(desc)) var inlineInfo = 0 - if (info.effectivelyFinal) inlineInfo |= 1 - if (info.traitMethodWithStaticImplementation) inlineInfo |= 2 - if (info.annotatedInline) inlineInfo |= 4 - if (info.annotatedNoInline) inlineInfo |= 8 + if (info.effectivelyFinal) inlineInfo |= 1 + // inlineInfo |= 2 // no longer written + if (info.annotatedInline) inlineInfo |= 4 + if (info.annotatedNoInline) inlineInfo |= 8 result.putByte(inlineInfo) } @@ -79,7 +82,7 @@ case class InlineInfoAttribute(inlineInfo: InlineInfo) extends Attribute(InlineI } /** - * De-serialize the attribute into an InlineInfo. The attribute starts at cr.b(off), but we don't + * Deserialize the attribute into an InlineInfo. The attribute starts at cr.b(off), but we don't * need to access that array directly, we can use the `read` methods provided by the ClassReader. * * `buf` is a pre-allocated character array that is guaranteed to be long enough to hold any @@ -94,15 +97,17 @@ case class InlineInfoAttribute(inlineInfo: InlineInfo) extends Attribute(InlineI val version = nextByte() if (version == 1) { - val hasSelfIsFinal = nextByte() - val isFinal = (hasSelfIsFinal & 1) != 0 - val hasSelf = (hasSelfIsFinal & 2) != 0 - - val self = if (hasSelf) { - val selfName = nextUTF8() - Some(selfName) - } else { - None + val flags = nextByte() + val isFinal = (flags & 1) != 0 + val hasSelf = (flags & 2) != 0 + val hasSam = (flags & 4) != 0 + + if (hasSelf) nextUTF8() // no longer used + + val sam = if (!hasSam) None else { + val name = nextUTF8() + val desc = nextUTF8() + Some(name + desc) } val numEntries = nextShort() @@ -111,14 +116,15 @@ case class InlineInfoAttribute(inlineInfo: InlineInfo) extends Attribute(InlineI val desc = nextUTF8() val inlineInfo = nextByte() - val isFinal = (inlineInfo & 1) != 0 - val traitMethodWithStaticImplementation = (inlineInfo & 2) != 0 - val isInline = (inlineInfo & 4) != 0 - val isNoInline = (inlineInfo & 8) != 0 - (name + desc, MethodInlineInfo(isFinal, traitMethodWithStaticImplementation, isInline, isNoInline)) + val isFinal = (inlineInfo & 1) != 0 + // = (inlineInfo & 2) != 0 // no longer used + val isInline = (inlineInfo & 4) != 0 + val isNoInline = (inlineInfo & 8) != 0 + (name + desc, MethodInlineInfo(isFinal, isInline, isNoInline)) }).toMap - InlineInfoAttribute(InlineInfo(self, isFinal, infos, None)) + val info = InlineInfo(isFinal, sam, infos, None) + InlineInfoAttribute(info) } else { val msg = UnknownScalaInlineInfoVersion(cr.getClassName, version) InlineInfoAttribute(BTypes.EmptyInlineInfo.copy(warning = Some(msg))) @@ -128,9 +134,18 @@ case class InlineInfoAttribute(inlineInfo: InlineInfo) extends Attribute(InlineI object InlineInfoAttribute { /** + * Notes: + * - `traitImplClassSelfType` is no longer emitted, `hasTraitImplClassSelfType` is always emitted + * as 0. Similarly, `traitMethodWithStaticImplementation` is always emitted 0. + * - When reading an existing attribute where `hasTraitImplClassSelfType` is 1, the + * `traitImplClassSelfType` is ignored. Also the value of `traitMethodWithStaticImplementation` + * is ignored. + * * [u1] version - * [u1] isEffectivelyFinal (<< 0), hasTraitImplClassSelfType (<< 1) + * [u1] isEffectivelyFinal (<< 0), hasTraitImplClassSelfType (<< 1), hasSam (<< 2), hasLateInterfaces (<< 3) * [u2]? traitImplClassSelfType (reference) + * [u2]? samName (reference) + * [u2]? samDescriptor (reference) * [u2] numMethodEntries * [u2] name (reference) * [u2] descriptor (reference) @@ -142,7 +157,7 @@ object InlineInfoAttribute { } /** - * In order to instruct the ASM framework to de-serialize the ScalaInlineInfo attribute, we need + * In order to instruct the ASM framework to deserialize the ScalaInlineInfo attribute, we need * to pass a prototype instance when running the class reader. */ -object InlineInfoAttributePrototype extends InlineInfoAttribute(InlineInfo(null, false, null, null)) +object InlineInfoAttributePrototype extends InlineInfoAttribute(InlineInfo(false, null, null, null)) |