[GR-73325] Template and Top of Stack optimization - #13108
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Insert PreserveFrameStateNode immediately before generated handler safepoints instead of preserving state in CHECKCAST source code. Anchor the WIDE handler BCI computation after opcode execution to avoid extending nextBCI across the dispatch switch and introducing a fast-path spill.
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This PR introduces support for template-based specialization and top-of-stack (TOS) optimization in the Graal/Truffle interpreter's "one compilation per bytecode handler" infrastructure. It enables generating multiple handler stub variants (templates), each specialized for different TOS state, by marking an expanded
@Argumentfield as the template variable. The PR also adds framework integration for managing handler tables keyed by template index, ensuring correct handler selection in interpreter threading.Key Changes:
@HostCompilerDirectives.BytecodeInterpreterHandlerConfig.Argument.Fieldannotation with atemplateVariableproperty to designate an int field as the template selector for handler specialization.templatesparameter to@HostCompilerDirectives.BytecodeInterpreterHandlerConfigto specify the number of template variants.TruffleBytecodeHandlerCallsite, handler stub generation, and stub lowering to inject a compile-time constant template variable, enabling specialization based on TOS or similar state.See detail documentation at
OneCompilationPerBytecodeHandler.md