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package scala.tools.nsc.backend.jvm.opt
import scala.annotation.switch
import scala.tools.asm.{Handle, Type, Opcodes}
import scala.tools.asm.tree._
object InstructionResultSize {
import Opcodes._
def apply(instruction: AbstractInsnNode): Int = (instruction.getOpcode: @switch) match {
// The order of opcodes is (almost) the same as in Opcodes.java
case ACONST_NULL => 1
case ICONST_M1 |
ICONST_0 |
ICONST_1 |
ICONST_2 |
ICONST_3 |
ICONST_4 |
ICONST_5 => 1
case LCONST_0 |
LCONST_1 => 2
case FCONST_0 |
FCONST_1 |
FCONST_2 => 1
case DCONST_0 |
DCONST_1 => 2
case BIPUSH |
SIPUSH => 1
case LDC =>
instruction.asInstanceOf[LdcInsnNode].cst match {
case _: java.lang.Integer |
_: java.lang.Float |
_: String |
_: Type |
_: Handle => 1
case _: java.lang.Long |
_: java.lang.Double => 2
}
case ILOAD |
FLOAD |
ALOAD => 1
case LLOAD |
DLOAD => 2
case IALOAD |
FALOAD |
AALOAD |
BALOAD |
CALOAD |
SALOAD => 1
case LALOAD |
DALOAD => 2
case ISTORE |
LSTORE |
FSTORE |
DSTORE |
ASTORE => 0
case IASTORE |
LASTORE |
FASTORE |
DASTORE |
AASTORE |
BASTORE |
CASTORE |
SASTORE => 0
case POP |
POP2 => 0
case DUP |
DUP_X1 |
DUP_X2 |
DUP2 |
DUP2_X1 |
DUP2_X2 |
SWAP => throw new IllegalArgumentException("Can't compute the size of DUP/SWAP without knowing what's on stack top")
case IADD |
FADD => 1
case LADD |
DADD => 2
case ISUB |
FSUB => 1
case LSUB |
DSUB => 2
case IMUL |
FMUL => 1
case LMUL |
DMUL => 2
case IDIV |
FDIV => 1
case LDIV |
DDIV => 2
case IREM |
FREM => 1
case LREM |
DREM => 2
case INEG |
FNEG => 1
case LNEG |
DNEG => 2
case ISHL |
ISHR => 1
case LSHL |
LSHR => 2
case IUSHR => 1
case LUSHR => 2
case IAND |
IOR |
IXOR => 1
case LAND |
LOR |
LXOR => 2
case IINC => 1
case I2F |
L2I |
L2F |
F2I |
D2I |
D2F |
I2B |
I2C |
I2S => 1
case I2L |
I2D |
L2D |
F2L |
F2D |
D2L => 2
case LCMP |
FCMPL |
FCMPG |
DCMPL |
DCMPG => 1
case IFEQ |
IFNE |
IFLT |
IFGE |
IFGT |
IFLE => 0
case IF_ICMPEQ |
IF_ICMPNE |
IF_ICMPLT |
IF_ICMPGE |
IF_ICMPGT |
IF_ICMPLE |
IF_ACMPEQ |
IF_ACMPNE => 0
case GOTO => 0
case JSR => throw new IllegalArgumentException("Subroutines are not supported.")
case RET => 0
case TABLESWITCH |
LOOKUPSWITCH => 0
case IRETURN |
FRETURN |
ARETURN => 1
case LRETURN |
DRETURN => 2
case RETURN => 0
case GETSTATIC => Type.getType(instruction.asInstanceOf[FieldInsnNode].desc).getSize
case PUTSTATIC => 0
case GETFIELD => Type.getType(instruction.asInstanceOf[FieldInsnNode].desc).getSize
case PUTFIELD => 0
case INVOKEVIRTUAL |
INVOKESPECIAL |
INVOKESTATIC |
INVOKEINTERFACE =>
val desc = instruction.asInstanceOf[MethodInsnNode].desc
Type.getReturnType(desc).getSize
case INVOKEDYNAMIC =>
val desc = instruction.asInstanceOf[InvokeDynamicInsnNode].desc
Type.getReturnType(desc).getSize
case NEW => 1
case NEWARRAY |
ANEWARRAY |
ARRAYLENGTH => 1
case ATHROW => 0
case CHECKCAST |
INSTANCEOF => 1
case MONITORENTER |
MONITOREXIT => 0
case MULTIANEWARRAY => 1
case IFNULL |
IFNONNULL => 0
}
}
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