LibWasm: Hold on to the stack depth for expressions in the validator

This allows preallocating the value stack when pushing frames, avoiding repeated reallocs and copies.
Author: https://github.com/alimpfard Commit: dc67f0ad4e Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5060 Reviewed-by: https://github.com/Hendiadyoin1 Reviewed-by: https://github.com/R-Goc Reviewed-by: https://github.com/awesomekling Reviewed-by: https://github.com/gmta
2025-10-24 00:49:46 +00:00 · 2025-06-06 14:12:28 +02:00 · 2025-06-06 14:12:28 +02:00 · dc67f0ad4e · 2025-08-08 10:56:54 +00:00
commit dc67f0ad4e
parent 3f77aa8521
4 changed files with 17 additions and 1 deletions
--- a/Libraries/LibWasm/AbstractMachine/Validator.cpp
+++ b/Libraries/LibWasm/AbstractMachine/Validator.cpp
@ -3736,6 +3736,8 @@ ErrorOr<Validator::ExpressionTypeResult, ValidationError> Validator::validate(Ex
    m_frames.take_last();
    VERIFY(m_frames.is_empty());

+    expression.set_stack_usage_hint(stack.max_known_size());
+
    return ExpressionTypeResult { stack.release_vector(), is_constant_expression };
 }