1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
package scala.tools.nsc.backend.jvm
import org.junit.Assert._
import scala.reflect.internal.util.BatchSourceFile
import scala.reflect.io.VirtualDirectory
import scala.tools.asm.Opcodes
import scala.tools.asm.tree.{AbstractInsnNode, LabelNode, ClassNode, MethodNode}
import scala.tools.cmd.CommandLineParser
import scala.tools.nsc.{Settings, Global}
import scala.tools.partest.ASMConverters
import scala.collection.JavaConverters._
object CodeGenTools {
import ASMConverters._
def genMethod( flags: Int = Opcodes.ACC_PUBLIC,
name: String = "m",
descriptor: String = "()V",
genericSignature: String = null,
throwsExceptions: Array[String] = null,
handlers: List[ExceptionHandler] = Nil,
localVars: List[LocalVariable] = Nil)(body: Instruction*): MethodNode = {
val node = new MethodNode(flags, name, descriptor, genericSignature, throwsExceptions)
applyToMethod(node, Method(body.toList, handlers, localVars))
node
}
def wrapInClass(method: MethodNode): ClassNode = {
val cls = new ClassNode()
cls.visit(Opcodes.V1_6, Opcodes.ACC_PUBLIC, "C", null, "java/lang/Object", null)
cls.methods.add(method)
cls
}
private def resetOutput(compiler: Global): Unit = {
compiler.settings.outputDirs.setSingleOutput(new VirtualDirectory("(memory)", None))
}
def newCompiler(defaultArgs: String = "-usejavacp", extraArgs: String = ""): Global = {
val settings = new Settings()
val args = (CommandLineParser tokenize defaultArgs) ++ (CommandLineParser tokenize extraArgs)
settings.processArguments(args, processAll = true)
val compiler = new Global(settings)
resetOutput(compiler)
compiler
}
def compile(compiler: Global)(code: String): List[(String, Array[Byte])] = {
compiler.reporter.reset()
resetOutput(compiler)
val run = new compiler.Run()
run.compileSources(List(new BatchSourceFile("unitTestSource.scala", code)))
val outDir = compiler.settings.outputDirs.getSingleOutput.get
(for (f <- outDir.iterator if !f.isDirectory) yield (f.name, f.toByteArray)).toList
}
def compileClasses(compiler: Global)(code: String): List[ClassNode] = {
compile(compiler)(code).map(p => AsmUtils.readClass(p._2)).sortBy(_.name)
}
def compileMethods(compiler: Global)(code: String): List[MethodNode] = {
compileClasses(compiler)(s"class C { $code }").head.methods.asScala.toList.filterNot(_.name == "<init>")
}
def singleMethodInstructions(compiler: Global)(code: String): List[Instruction] = {
val List(m) = compileMethods(compiler)(code)
instructionsFromMethod(m)
}
def singleMethod(compiler: Global)(code: String): Method = {
val List(m) = compileMethods(compiler)(code)
convertMethod(m)
}
def assertSameCode(actual: List[Instruction], expected: List[Instruction]): Unit = {
assertTrue(s"\nExpected: $expected\nActual : $actual", actual === expected)
}
def getSingleMethod(classNode: ClassNode, name: String): Method =
convertMethod(classNode.methods.asScala.toList.find(_.name == name).get)
}
|
