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 *
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 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
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package org.jf.dexlib2.builder;

import com.google.common.collect.Lists;
import junit.framework.Assert;
import org.jf.dexlib2.Opcode;
import org.jf.dexlib2.builder.instruction.BuilderInstruction10t;
import org.jf.dexlib2.builder.instruction.BuilderInstruction10x;
import org.jf.dexlib2.iface.ExceptionHandler;
import org.jf.dexlib2.iface.MethodImplementation;
import org.jf.dexlib2.iface.TryBlock;
import org.jf.dexlib2.iface.debug.DebugItem;
import org.jf.dexlib2.iface.debug.LineNumber;
import org.jf.dexlib2.iface.instruction.Instruction;
import org.jf.dexlib2.iface.instruction.OffsetInstruction;
import org.junit.Test;

import java.util.List;

public class FixOffsetsTest {
    @Test
    public void testFixOffsets() {
        MethodImplementationBuilder builder = new MethodImplementationBuilder(1);

        Label firstGotoTarget = builder.getLabel("firstGotoTarget");
        builder.addInstruction(new BuilderInstruction10t(Opcode.GOTO, firstGotoTarget));

        builder.addLineNumber(1);

        for (int i=0; i<250; i++) {
            builder.addInstruction(new BuilderInstruction10x(Opcode.NOP));
        }

        builder.addLabel("tryStart");

        builder.addLineNumber(2);

        for (int i=0; i<250; i++) {
            builder.addInstruction(new BuilderInstruction10x(Opcode.NOP));
        }

        builder.addLineNumber(3);

        Label secondGotoTarget = builder.getLabel("secondGotoTarget");
        builder.addInstruction(new BuilderInstruction10t(Opcode.GOTO, secondGotoTarget));


        builder.addLineNumber(4);
        builder.addLabel("handler");

        for (int i=0; i<500; i++) {
            builder.addInstruction(new BuilderInstruction10x(Opcode.NOP));
        }

        builder.addLineNumber(5);

        builder.addLabel("tryEnd");

        builder.addLabel("firstGotoTarget");
        builder.addLabel("secondGotoTarget");
        builder.addInstruction(new BuilderInstruction10x(Opcode.RETURN_VOID));

        Label tryStart = builder.getLabel("tryStart");
        Label tryEnd = builder.getLabel("tryEnd");
        Label handler = builder.getLabel("handler");

        builder.addCatch(tryStart, tryEnd, handler);

        MethodImplementation impl = builder.getMethodImplementation();

        List<? extends Instruction> instructions = Lists.newArrayList(impl.getInstructions());
        Assert.assertEquals(1003, instructions.size());

        Assert.assertEquals(Opcode.GOTO_16, instructions.get(0).getOpcode());
        Assert.assertEquals(1004, ((OffsetInstruction)instructions.get(0)).getCodeOffset());

        Assert.assertEquals(Opcode.GOTO_16, instructions.get(501).getOpcode());
        Assert.assertEquals(502, ((OffsetInstruction)instructions.get(501)).getCodeOffset());

        List<? extends TryBlock<? extends ExceptionHandler>> exceptionHandlers = impl.getTryBlocks();

        Assert.assertEquals(1, exceptionHandlers.size());
        Assert.assertEquals(252, exceptionHandlers.get(0).getStartCodeAddress());
        Assert.assertEquals(752, exceptionHandlers.get(0).getCodeUnitCount());

        Assert.assertEquals(1, exceptionHandlers.get(0).getExceptionHandlers().size());

        ExceptionHandler exceptionHandler = exceptionHandlers.get(0).getExceptionHandlers().get(0);
        Assert.assertEquals(504, exceptionHandler.getHandlerCodeAddress());

        List<DebugItem> debugItems = Lists.newArrayList(impl.getDebugItems());

        Assert.assertEquals(5, debugItems.size());

        Assert.assertEquals(1, ((LineNumber)debugItems.get(0)).getLineNumber());
        Assert.assertEquals(2, debugItems.get(0).getCodeAddress());

        Assert.assertEquals(2, ((LineNumber)debugItems.get(1)).getLineNumber());
        Assert.assertEquals(252, debugItems.get(1).getCodeAddress());

        Assert.assertEquals(3, ((LineNumber)debugItems.get(2)).getLineNumber());
        Assert.assertEquals(502, debugItems.get(2).getCodeAddress());

        Assert.assertEquals(4, ((LineNumber)debugItems.get(3)).getLineNumber());
        Assert.assertEquals(504, debugItems.get(3).getCodeAddress());

        Assert.assertEquals(5, ((LineNumber)debugItems.get(4)).getLineNumber());
        Assert.assertEquals(1004, debugItems.get(4).getCodeAddress());
    }
}