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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Implement control flow statements in WebAssembly"
href="https://bugs.webkit.org/show_bug.cgi?id=148934#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Implement control flow statements in WebAssembly"
href="https://bugs.webkit.org/show_bug.cgi?id=148934">bug 148934</a>
from <span class="vcard"><a class="email" href="mailto:sukolsak@gmail.com" title="Sukolsak Sakshuwong <sukolsak@gmail.com>"> <span class="fn">Sukolsak Sakshuwong</span></a>
</span></b>
<pre>When we implement an LLVM IR generator for WebAssembly, JumpTarget will be just an LLVM Basic Block. The code will look like this:
typedef LBasicBlock JumpTarget;
LBasicBlock newTarget()
{
return m_out.newBlock();
}
void linkTarget(LBasicBlock target)
{
m_out.jump(target);
m_out.appendTo(target);
}
void jumpToTarget(LBasicBlock target)
{
m_out.jump(target);
}
void jumpToTargetIf(JumpCondition condition, LValue expression, LBasicBlock target)
{
LBasicBlock notTaken = m_out.newBlock();
m_out.branch((condition == JumpCondition::Zero) ? m_out.isZero32(expression) : m_out.notZero32(expression), FTL::unsure(target), FTL::unsure(notTaken));
m_out.appendTo(notTaken);
}</pre>
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