Split GetInterpThreadContext into allocating and non-allocating variants #122688
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Tagging subscribers to this area: @BrzVlad, @janvorli, @kg |
jkotas
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This ensures that InterpThreadContext is not allocated unless the interpreter is actually used. For example, TryEnsureSufficientExecutionStack allocated InterpThreadContext even when the interpreter is not used.
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Pull request overview
This pull request optimizes interpreter thread context allocation by splitting GetInterpThreadContext into two variants: a non-allocating getter (GetInterpThreadContext) and an allocating/creating variant (GetOrCreateInterpThreadContext). This ensures that InterpThreadContext is only allocated when the interpreter is actually used, avoiding unnecessary allocations in scenarios like TryEnsureSufficientExecutionStack.
Key Changes
- Added
GetOrCreateInterpThreadContext()method that allocates the context if needed - Modified
GetInterpThreadContext()to simply return the existing context (may be null) - Updated all call sites where allocation is needed to use the new
GetOrCreateInterpThreadContext() - Changed memory allocation from
malloc/freetonew/deletefor consistency - Moved interpreter context cleanup in
OnThreadTerminateafter the shutdown check
Reviewed changes
Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
| src/coreclr/vm/threads.h | Added declaration for GetOrCreateInterpThreadContext() |
| src/coreclr/vm/threads.cpp | Implemented split methods with appropriate contracts; moved cleanup code |
| src/coreclr/vm/prestub.cpp | Updated local helper to use allocating variant |
| src/coreclr/vm/interpexec.cpp | Changed to use allocating variant and switched to new/delete |
| src/coreclr/vm/eetwain.cpp | Removed null checks that are now potentially problematic |
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Related to #122404 |
BrzVlad
approved these changes
Dec 22, 2025
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This ensures that InterpThreadContext is not allocated unless the interpreter is actually used. For example, TryEnsureSufficientExecutionStack allocated InterpThreadContext even when the interpreter is not used.