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122 lines
3.9 KiB
Markdown
122 lines
3.9 KiB
Markdown
# mruby configuration macros.
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## How to use these macros.
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You can use mrbconfs with following ways:
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* Write them in `mrbconf.h`.
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* Using compiler flags is prefered when building a cross binaries or multiple mruby binaries
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since it's easier to use different mrbconf per each `MRuby::Build`.
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* Most flags can be enabled by just commenting in.
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* Pass them as compiler flags.
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* Make sure you pass the same flags to all compilers since some mrbconf(e.g., `MRB_GC_FIXED_ARENA`)
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changes `struct` layout and cause memory access error when C and other language(e.g., C++) is mixed.
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## stdio setting.
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`ENABLE_STDIO`
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* Will be defined automatically if `DISABLE_STDIO` isn't defined.
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* Uses `<stdio.h>` functions.
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`DISABLE_STDIO`
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* When defined `<stdio.h>` functions won't be used.
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## Debug macros.
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`ENABLE_DEBUG`
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* When defined code fetch hook and debug OP hook will be enabled.
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* When using any of the hook set function pointer `code_fetch_hook` and/or `debug_op_hook` of `mrb_state`.
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* Fetch hook will be called before any OP.
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* Debug OP hook will be called when dispatching `OP_DEBUG`.
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`DISABLE_DEBUG`
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* Will be define automatically if `ENABLE_DEBUG` isn't defined.
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`MRB_DEBUG`
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* When defined `mrb_assert*` macro will be defined with macros from `<assert.h>`.
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* Could be enabled via `enable_debug` method of `MRuby::Build`.
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## Stack configuration
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`MRB_STACK_EXTEND_DOUBLING`
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* If defined doubles the stack size when extending it.
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* Else extends stack with `MRB_STACK_GROWTH`.
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`MRB_STACK_GROWTH`
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* Default value is `128`.
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* Used in stack extending.
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* Ignored when `MRB_STACK_EXTEND_DOUBLING` is defined.
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`MRB_STACK_MAX`
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* Default value is `0x40000 - MRB_STACK_GROWTH`.
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* Raises `RuntimeError` when stack size exceeds this value.
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## Primitive type configuration.
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`MRB_USE_FLOAT`
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* When defined single precision floating point type(C type `float`) is used as `mrb_float`.
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* Else double precision floating point type(C type `double`) is used as `mrb_float`.
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`MRB_INT16`
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* When defined `int16_t` will be defined as `mrb_int`.
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* Conflicts with `MRB_INT64`.
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`MRB_INT64`
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* When defined `int64_t` will be defined as `mrb_int`.
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* Conflicts with `MRB_INT16`.
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* When `MRB_INT16` or `MRB_INT64` isn't defined `int`(most of the times 32-bit integer)
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will be defined as `mrb_int`.
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## Garbage collector configuration.
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`MRB_GC_STRESS`
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* When defined full GC is emitted per each `RBasic` allocation.
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* Mainly used in memory manager debugging.
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`MRB_GC_TURN_OFF_GENERATIONAL`
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* When defined turns generational GC by default.
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`MRB_GC_FIXED_ARENA`
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* When defined used fixed size GC arena.
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* Raises `RuntimeError` when this is defined and GC arena size exceeds `MRB_GC_ARENA_SIZE`.
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* Useful tracking unnecessary mruby object allocation.
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`MRB_GC_ARENA_SIZE`
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* Default value is 100.
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* Ignored when `MRB_GC_FIXED_ARENA` isn't defined.
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* Defines fixed GC arena size.
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## Memory pool configuration.
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`POOL_ALIGNMENT`
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* Default value is `4`.
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* If you're allocating data types that requires alignment more than default value define the
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largest value of required alignment.
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`POOL_PAGE_SIZE`
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* Default value is `16000`.
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* Specifies page size of pool page.
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* Smaller the value is increases memory overhead.
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## State atexit configuration.
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`MRB_FIXED_STATE_ATEXIT_STACK`
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* If defined enables fixed size `mrb_state` atexit stack.
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* Raises `RuntimeError` when `mrb_state_atexit` call count to same `mrb_state` exceeds
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`MRB_FIXED_STATE_ATEXIT_STACK_SIZE`'s value.
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`MRB_FIXED_STATE_ATEXIT_STACK_SIZE`
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* Default value is `5`.
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* If `MRB_FIXED_STATE_ATEXIT_STACK` isn't defined this macro is ignored.
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## `mrb_value` configuration.
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`MRB_ENDIAN_BIG`
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* If defined compiles mruby for big endian machines.
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* Used in `MRB_NAN_BOXING`.
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* Some mrbgem use this mrbconf.
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`MRB_NAN_BOXING`
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* If defined represent `mrb_value` in boxed `double`.
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* Conflicts with `MRB_USE_FLOAT`.
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`MRB_WORD_BOXING`
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* If defined represent `mrb_value` as a word.
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* If defined `Float` will be a mruby object with `RBasic`.
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