File	Doc	Category	Size	Date	Package
BasicBlock.java	API Doc	Android 1.5 API	8597	Wed May 06 22:41:02 BST 2009	com.android.dx.rop.code

BasicBlock

• java.lang.Object

Fields Summary
private final int	label >= 0; target label for this block
private final InsnList	insns non-null; list of instructions in this block
private final com.android.dx.util.IntList	successors non-null; full list of successors that this block may branch to
private final int	primarySuccessor >= -1; the primary / standard-flow / "default" successor, or -1 if this block has no successors (that is, it exits the function/method)

Constructors Summary

public BasicBlock(int label, InsnList insns, com.android.dx.util.IntList successors, int primarySuccessor) Constructs an instance. The predecessor set is set to null. param label >= 0; target label for this block param insns non-null; list of instructions in this block param successors non-null; full list of successors that this block may branch to param primarySuccessor >= -1; the primary / standard-flow / "default" successor, or -1 if this block has no successors (that is, it exits the function/method or is an unconditional throw) if (label < 0) { throw new IllegalArgumentException("label < 0"); } try { insns.throwIfMutable(); } catch (NullPointerException ex) { // Elucidate exception. throw new NullPointerException("insns == null"); } int sz = insns.size(); if (sz == 0) { throw new IllegalArgumentException("insns.size() == 0"); } for (int i = sz - 2; i >= 0; i--) { Rop one = insns.get(i).getOpcode(); if (one.getBranchingness() != Rop.BRANCH_NONE) { throw new IllegalArgumentException("insns[" + i + "] is a " + "branch or can throw"); } } Insn lastInsn = insns.get(sz - 1); if (lastInsn.getOpcode().getBranchingness() == Rop.BRANCH_NONE) { throw new IllegalArgumentException("insns does not end with " + "a branch or throwing " + "instruction"); } try { successors.throwIfMutable(); } catch (NullPointerException ex) { // Elucidate exception. throw new NullPointerException("successors == null"); } if (primarySuccessor < -1) { throw new IllegalArgumentException("primarySuccessor < -1"); } if (primarySuccessor >= 0 && !successors.contains(primarySuccessor)) { throw new IllegalArgumentException( "primarySuccessor not in successors"); } this.label = label; this.insns = insns; this.successors = successors; this.primarySuccessor = primarySuccessor;

Methods Summary
public boolean	canThrow() Returns whether this block might throw an exception. This is just a convenient shorthand for getLastInsn().canThrow(). return true iff this block might throw an exception return insns.getLast().canThrow();
public boolean	equals(java.lang.Object other) {@inheritDoc} Instances of this class compare by identity. That is, x.equals(y) is only true if x == y. return (this == other);
public com.android.dx.rop.type.TypeList	getExceptionHandlerTypes() Returns the exception handler types associated with this block, if any. This is just a shorthand for inspecting the last instruction in the block to see if it could throw, and if so, grabbing the catch list out of it. If not, this returns an empty list (not null). return non-null; the exception handler types associated with this block Insn lastInsn = insns.getLast(); return lastInsn.getCatches();
public Insn	getFirstInsn() Gets the first instruction of this block. This is just a convenient shorthand for getInsns().get(0). return non-null; the first instruction return insns.get(0);
public InsnList	getInsns() Gets the list of instructions inside this block. return non-null; the instruction list return insns;
public int	getLabel() Gets the target label of this block. return >= 0; the label return label;
public Insn	getLastInsn() Gets the last instruction of this block. This is just a convenient shorthand for getInsns().getLast(). return non-null; the last instruction return insns.getLast();
public int	getPrimarySuccessor() Gets the primary successor of this block. return >= -1; the primary successor, or -1 if this block has no successors at all return primarySuccessor;
public int	getSecondarySuccessor() Gets the secondary successor of this block. It is only valid to call this method on blocks that have exactly two successors. return >= 0; the secondary successor if (successors.size() != 2) { throw new UnsupportedOperationException( "block doesn't have exactly two successors"); } int succ = successors.get(0); if (succ == primarySuccessor) { succ = successors.get(1); } return succ;
public com.android.dx.util.IntList	getSuccessors() Gets the list of successors that this block may branch to. return non-null; the successors list return successors;
public boolean	hasExceptionHandlers() Returns whether this block has any associated exception handlers. This is just a shorthand for inspecting the last instruction in the block to see if it could throw, and if so, whether it in fact has any associated handlers. return true iff this block has any associated exception handlers Insn lastInsn = insns.getLast(); return lastInsn.getCatches().size() != 0;
public int	hashCode() {@inheritDoc} Return the identity hashcode of this instance. This is proper, since instances of this class compare by identity (see {@link #equals}). return System.identityHashCode(this);
public java.lang.String	toString() return '{" + Hex.u2(label) + '}";
public com.android.dx.rop.code.BasicBlock	withRegisterOffset(int delta) Returns an instance that is identical to this one, except that the registers in each instruction are offset by the given amount. param delta the amount to offset register numbers by return non-null; an appropriately-constructed instance return new BasicBlock(label, insns.withRegisterOffset(delta), successors, primarySuccessor);