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According to MSVC manual (*1), cl.exe can skip including a header file when that: - contains #pragma once, or - starts with #ifndef, or - starts with #if ! defined. GCC has a similar trick (*2), but it acts more stricter (e. g. there must be _no tokens_ outside of #ifndef...#endif). Sun C lacked #pragma once for a looong time. Oracle Developer Studio 12.5 finally implemented it, but we cannot assume such recent version. This changeset modifies header files so that each of them include strictly one #ifndef...#endif. I believe this is the most portable way to trigger compiler optimizations. [Bug #16770] *1: https://docs.microsoft.com/en-us/cpp/preprocessor/once *2: https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html
61 lines
2.1 KiB
C
61 lines
2.1 KiB
C
#ifndef RUBY_TRANSIENT_HEAP_H
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#define RUBY_TRANSIENT_HEAP_H
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/**********************************************************************
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transient_heap.h - declarations of transient_heap related APIs.
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Copyright (C) 2018 Koichi Sasada
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**********************************************************************/
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#include "internal.h"
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#if USE_TRANSIENT_HEAP
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/* public API */
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/* Allocate req_size bytes from transient_heap.
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Allocated memories are free-ed when next GC
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if this memory is not marked by `rb_transient_heap_mark()`.
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*/
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void *rb_transient_heap_alloc(VALUE obj, size_t req_size);
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/* If `obj` uses a memory pointed by `ptr` from transient_heap,
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you need to call `rb_transient_heap_mark(obj, ptr)`
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to assert liveness of `obj` (and ptr). */
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void rb_transient_heap_mark(VALUE obj, const void *ptr);
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/* used by gc.c */
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void rb_transient_heap_promote(VALUE obj);
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void rb_transient_heap_start_marking(int full_marking);
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void rb_transient_heap_finish_marking(void);
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void rb_transient_heap_update_references(void);
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/* for debug API */
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void rb_transient_heap_dump(void);
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void rb_transient_heap_verify(void);
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int rb_transient_heap_managed_ptr_p(const void *ptr);
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/* evacuate functions for each type */
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void rb_ary_transient_heap_evacuate(VALUE ary, int promote);
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void rb_obj_transient_heap_evacuate(VALUE obj, int promote);
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void rb_hash_transient_heap_evacuate(VALUE hash, int promote);
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void rb_struct_transient_heap_evacuate(VALUE st, int promote);
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#else /* USE_TRANSIENT_HEAP */
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#define rb_transient_heap_alloc(o, s) NULL
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#define rb_transient_heap_verify() ((void)0)
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#define rb_transient_heap_promote(obj) ((void)0)
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#define rb_transient_heap_start_marking(full_marking) ((void)0)
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#define rb_transient_heap_update_references() ((void)0)
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#define rb_transient_heap_finish_marking() ((void)0)
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#define rb_transient_heap_mark(obj, ptr) ((void)0)
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#define rb_ary_transient_heap_evacuate(x, y) ((void)0)
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#define rb_obj_transient_heap_evacuate(x, y) ((void)0)
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#define rb_hash_transient_heap_evacuate(x, y) ((void)0)
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#define rb_struct_transient_heap_evacuate(x, y) ((void)0)
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#endif /* USE_TRANSIENT_HEAP */
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#endif
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