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LibJS/JIT: Add fast path for cached GetVariable accesses

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We can now stay in machine code for environment variable read accesses
as long as they are cached and initialized.

20% speed-up on Octane/zlib.js :^)
This commit is contained in:
Andreas Kling 2023-11-06 15:23:49 +01:00
parent 7826c006c1
commit 1d8ec677a3
6 changed files with 147 additions and 3 deletions
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3
Userland/Libraries/LibJS/Runtime/Environment.h
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@ -57,6 +57,9 @@ public:
bool is_permanently_screwed_by_eval() const { return m_permanently_screwed_by_eval; }
void set_permanently_screwed_by_eval();
static FlatPtr is_permanently_screwed_by_eval_offset() { return OFFSET_OF(Environment, m_permanently_screwed_by_eval); }
static FlatPtr outer_environment_offset() { return OFFSET_OF(Environment, m_outer_environment); }
protected:
explicit Environment(Environment* parent);