From 40466c3e2d7d26a43b58f008986fd0b84c986b27 Mon Sep 17 00:00:00 2001
From: Roel Spilker <r.spilker@gmail.com>
Date: Tue, 3 Aug 2010 02:54:03 +0200
Subject: Hey, the sneaky throws remover works, at least when run separately.

---
 src/core/lombok/bytecode/SneakyThrowsRemover.java | 80 +++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 src/core/lombok/bytecode/SneakyThrowsRemover.java

(limited to 'src/core/lombok/bytecode/SneakyThrowsRemover.java')

diff --git a/src/core/lombok/bytecode/SneakyThrowsRemover.java b/src/core/lombok/bytecode/SneakyThrowsRemover.java
new file mode 100644
index 00000000..b816cd54
--- /dev/null
+++ b/src/core/lombok/bytecode/SneakyThrowsRemover.java
@@ -0,0 +1,80 @@
+package lombok.bytecode;
+
+import lombok.core.DiagnosticsReceiver;
+import lombok.core.PostCompilerTransformation;
+
+import org.mangosdk.spi.ProviderFor;
+import org.objectweb.asm.ClassAdapter;
+import org.objectweb.asm.ClassReader;
+import org.objectweb.asm.ClassVisitor;
+import org.objectweb.asm.ClassWriter;
+import org.objectweb.asm.MethodAdapter;
+import org.objectweb.asm.MethodVisitor;
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.commons.JSRInlinerAdapter;
+
+@ProviderFor(PostCompilerTransformation.class)
+public class SneakyThrowsRemover implements PostCompilerTransformation {
+	private static class FixedClassWriter extends ClassWriter {
+		FixedClassWriter(ClassReader classReader, int flags) {
+			super(classReader, flags);
+		}
+		
+		@Override protected String getCommonSuperClass(String type1, String type2) {
+			//By default, ASM will attempt to live-load the class types, which will fail if meddling with classes in an
+			//environment with custom classloaders, such as Equinox. It's just an optimization; returning Object is always legal.
+			try {
+				return super.getCommonSuperClass(type1, type2);
+			} catch (Exception e) {
+				return "java/lang/Object";
+			}
+		}
+	}
+	
+	protected byte[] fixJSRInlining(byte[] byteCode) {
+		ClassReader reader = new ClassReader(byteCode);
+		ClassWriter writer = new FixedClassWriter(reader, 0);
+		
+		ClassVisitor visitor = new ClassAdapter(writer) {
+			@Override public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
+				return new JSRInlinerAdapter(super.visitMethod(access, name, desc, signature, exceptions), access, name, desc, signature, exceptions);
+			}
+		};
+		
+		reader.accept(visitor, 0);
+		return writer.toByteArray();
+	}
+	
+	@Override public byte[] applyTransformations(byte[] original, String className, DiagnosticsReceiver diagnostics) {
+		byte[] fixedByteCode = fixJSRInlining(original);
+		
+		ClassReader reader = new ClassReader(fixedByteCode);
+		ClassWriter writer = new FixedClassWriter(reader, ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
+		
+		reader.accept(new ClassAdapter(writer) {
+			@Override public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
+				return new SneakyThrowsRemoverVisitor(super.visitMethod(access, name, desc, signature, exceptions));
+			}
+		}, 0);
+		return writer.toByteArray();
+	}
+	
+	private class SneakyThrowsRemoverVisitor extends MethodAdapter {
+		SneakyThrowsRemoverVisitor(MethodVisitor mv) {
+			super(mv);
+		}
+		
+		@Override public void visitMethodInsn(int opcode, String owner, String name, String desc) {
+			boolean hit = true;
+			if (hit && opcode != Opcodes.INVOKESTATIC) hit = false;
+			if (hit && !"sneakyThrow".equals(name)) hit = false;
+			if (hit && !"lombok/Lombok".equals(owner)) hit = false;
+			if (hit && !"(Ljava/lang/Throwable;)Ljava/lang/RuntimeException;".equals(desc)) hit = false;
+			if (hit) {
+				super.visitInsn(Opcodes.ATHROW);
+			} else {
+				super.visitMethodInsn(opcode, owner, name, desc);
+			}
+		}
+	}
+}
-- 
cgit