[webkit-changes] [WebKit/WebKit] 275501: [JSC] Emit up to 2 less bytecodes for `try` statement

[Commit Queue]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 275501dd6e3a9a954482cd0afd71ef898ae62bd8
      https://github.com/WebKit/WebKit/commit/275501dd6e3a9a954482cd0afd71ef898ae62bd8
  Author: Alexey Shvayka <ashvayka at apple.com>
  Date:   2024-07-22 (Mon, 22 Jul 2024)

  Changed paths:
    M Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp

  Log Message:
  -----------
  [JSC] Emit up to 2 less bytecodes for `try` statement
https://bugs.webkit.org/show_bug.cgi?id=276876
<rdar://problem/132224237>

Reviewed by Yusuke Suzuki.

This change:

  1) given try/finally, removes the jump from the end of `try` block to the start of `finally`,
     which are adjacent basic blocks (execution will just fall through);
  2) given try/catch, at the end of `catch` block, removes the load to `thrownValueRegister`,
     which is no longer in use at that point;
  3) given try/catch/finally, removes the jump from the end of `catch` block to the start of `finally`,
     which are adjacent basic blocks (execution will just fall through).

No new tests, no behavior change.

* Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp:
(JSC::TryNode::emitBytecode):

Canonical link: https://commits.webkit.org/281203@main



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