bool
RegisterAllocator::init()
{
    if (!insData.init(mir, graph.numInstructions()))
        return false;

    if (!entryPositions.reserve(graph.numBlocks()) || !exitPositions.reserve(graph.numBlocks()))
        return false;

    for (size_t i = 0; i < graph.numBlocks(); i++) {
        LBlock* block = graph.getBlock(i);
        for (LInstructionIterator ins = block->begin(); ins != block->end(); ins++)
            insData[ins->id()] = *ins;
        for (size_t j = 0; j < block->numPhis(); j++) {
            LPhi* phi = block->getPhi(j);
            insData[phi->id()] = phi;
        }

        CodePosition entry = block->numPhis() != 0
                             ? CodePosition(block->getPhi(0)->id(), CodePosition::INPUT)
                             : inputOf(block->firstInstructionWithId());
        CodePosition exit = outputOf(block->lastInstructionWithId());

        MOZ_ASSERT(block->mir()->id() == i);
        entryPositions.infallibleAppend(entry);
        exitPositions.infallibleAppend(exit);
    }

    return true;
}
bool
RegisterAllocator::init()
{
    if (!insData.init(mir, graph.numInstructions()))
        return false;

    for (size_t i = 0; i < graph.numBlocks(); i++) {
        LBlock* block = graph.getBlock(i);
        for (LInstructionIterator ins = block->begin(); ins != block->end(); ins++)
            insData[ins->id()] = *ins;
        for (size_t j = 0; j < block->numPhis(); j++) {
            LPhi* phi = block->getPhi(j);
            insData[phi->id()] = phi;
        }
    }

    return true;
}