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Do not use MRB_METHOD_TABLE_INLINE by default; fix #3924

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It was default on Linux. Abandoned for 2 reasons:

* some cross-platform compiler defines `__linux__` even on bare metal
  environment (RTL8196 (MIPS big endian soc) for example).

* some compilers do not align functions pointers so that we need to
  specify `-falign-functions=n` (where n>1). It's not suitable for
  default configuration.

By our measurement, `mrbtest` consumes 400KB less memory. So if your
target machine is memory tight, add the following command-line options
to `GCC` (unfortunately `clang` does not support `-falign-functions`).

`-falign-functions=2 -DMRB_METHOD_TABLE_INLINE`
This commit is contained in:
Yukihiro "Matz" Matsumoto
2018-01-25 14:03:29 +09:00
parent ec1a5af719
commit 83f2654bac
1 changed files with 3 additions and 5 deletions
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include/mrbconf.h
+3 -5
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@@ -36,12 +36,10 @@
/* size of the method cache (need to be the power of 2) */
//#define MRB_METHOD_CACHE_SIZE (1<<7)
/* add -DMRB_METHOD_TABLE_INLINE unless platform uses MSB of pointers */
/* add -DMRB_METHOD_TABLE_INLINE to reduce the size of method table */
/* MRB_METHOD_TABLE_INLINE requires LSB of function pointers to be zero */
/* you might need to specify --falign-functions=n (where n>1) */
//#define MRB_METHOD_TABLE_INLINE
/* turn MRB_METHOD_TABLE_INLINE on for linux by default */
#if !defined(MRB_METHOD_TABLE_INLINE) && defined(__linux__)
# define MRB_METHOD_TABLE_INLINE
#endif
/* add -DMRB_INT16 to use 16bit integer for mrb_int; conflict with MRB_INT64 */
//#define MRB_INT16