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02c624fc09
* module/language/cps/slot-allocation.scm (lookup-dead-slot-map) (allocate-slots): For each non-tail call in a function, compute the set of slots that are dead after the function has begun the call. * module/language/cps/compile-bytecode.scm (compile-fun): Emit the `dead-slot-map' macro instruction for non-tail calls. * module/system/vm/assembler.scm (<asm>): Add `dead-slot-maps' member. (dead-slot-map): New macro-instruction. (link-frame-maps, link-dynamic-section, link-objects): Write dead slots information into .guile.frame-maps sections of ELF files. * module/system/vm/elf.scm (DT_GUILE_FRAME_MAPS): New definition. * libguile/loader.h: * libguile/loader.c (DT_GUILE_FRAME_MAPS, process_dynamic_segment): (load_thunk_from_memory, register_elf): Arrange to parse DT_GUILE_FRAME_MAPS out of the dynamic section. (find_mapped_elf_image_unlocked, find_mapped_elf_image): New helpers. (scm_find_mapped_elf_image): Refactor. (scm_find_dead_slot_map_unlocked): New interface. * libguile/vm.c (scm_i_vm_mark_stack): Mark the hottest frame conservatively, as before. Otherwise use the dead slots map, if available, to avoid marking data that isn't live. |
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