FileDocCategorySizeDatePackage
BlockAddresses.javaAPI DocAndroid 1.5 API4549Wed May 06 22:41:02 BST 2009com.android.dx.dex.code

BlockAddresses

public final class BlockAddresses extends Object
Container for the set of {@link CodeAddress} instances associated with the blocks of a particular method. Each block has a corresponding start address, end address, and last instruction address.

Fields Summary
private final CodeAddress[]
starts
non-null; array containing addresses for the start of each basic block (indexed by basic block label)
private final CodeAddress[]
lasts
non-null; array containing addresses for the final instruction of each basic block (indexed by basic block label)
private final CodeAddress[]
ends
non-null; array containing addresses for the end (just past the final instruction) of each basic block (indexed by basic block label)
Constructors Summary
public BlockAddresses(com.android.dx.rop.code.RopMethod method)
Constructs an instance.

param
method non-null; the method to have block addresses for

        BasicBlockList blocks = method.getBlocks();
        int maxLabel = blocks.getMaxLabel();

        this.starts = new CodeAddress[maxLabel];
        this.lasts = new CodeAddress[maxLabel];
        this.ends = new CodeAddress[maxLabel];

        setupArrays(method);
Methods Summary
public CodeAddressgetEnd(com.android.dx.rop.code.BasicBlock block)
Gets the instance for the end (address after the final instruction) of the given block.

param
block non-null; the block in question
return
non-null; the appropriate instance

        return ends[block.getLabel()];
public CodeAddressgetEnd(int label)
Gets the instance for the end (address after the final instruction) of the block with the given label.

param
label non-null; the label of the block in question
return
non-null; the appropriate instance

        return ends[label];
public CodeAddressgetLast(com.android.dx.rop.code.BasicBlock block)
Gets the instance for the final instruction of the given block.

param
block non-null; the block in question
return
non-null; the appropriate instance

        return lasts[block.getLabel()];
public CodeAddressgetLast(int label)
Gets the instance for the final instruction of the block with the given label.

param
label non-null; the label of the block in question
return
non-null; the appropriate instance

        return lasts[label];
public CodeAddressgetStart(com.android.dx.rop.code.BasicBlock block)
Gets the instance for the start of the given block.

param
block non-null; the block in question
return
non-null; the appropriate instance

        return starts[block.getLabel()];
public CodeAddressgetStart(int label)
Gets the instance for the start of the block with the given label.

param
label non-null; the label of the block in question
return
non-null; the appropriate instance

        return starts[label];
private voidsetupArrays(com.android.dx.rop.code.RopMethod method)
Sets up the address arrays.

        BasicBlockList blocks = method.getBlocks();
        int sz = blocks.size();

        for (int i = 0; i < sz; i++) {
            BasicBlock one = blocks.get(i);
            int label = one.getLabel();
            Insn insn = one.getInsns().get(0);

            starts[label] = new CodeAddress(insn.getPosition());

            SourcePosition pos = one.getLastInsn().getPosition();

            lasts[label] = new CodeAddress(pos);
            ends[label] = new CodeAddress(pos);
        }