mirror of
https://github.com/mruby/mruby
synced 2026-06-08 16:11:16 +00:00
Fangrui Song
7f044341f9
In lld linked programs, .rodata comes before .text, thus mrb_ro_data_p will return false for strings in .rodata. Change the lower bound from _etext to __ehdr_start to catch these cases. This works for ld.bfd, gold and lld, and it does not have false positives even if .init_array does not exist. Remove the branch that uses _edata: strings in .data can be modified so this is semantically incorrect. Delete the __APPLE__ branch (its manpages say get_etext() and get_edata() are strongly discouraged). .init_array has been adopted by most ELF platforms to supersede .ctors. Neither _etext nor _edata is used, so rename MRB_USE_ETEXT_EDATA to MRB_USE_EHDR_START.
186 lines
6.3 KiB
Markdown
186 lines
6.3 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 preferred 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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`MRB_DISABLE_STDIO`
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* When defined `<stdio.h>` functions won't be used.
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* Some features will be disabled when this is enabled:
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* `mrb_irep` load/dump from/to file.
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* Compiling mruby script from file.
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* Printing features in **src/print.c**.
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## Debug macros.
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`MRB_ENABLE_DEBUG_HOOK`
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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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`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_WITHOUT_FLOAT`
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* When defined removes floating point numbers from mruby.
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* It makes mruby easier to handle in "Microcontroller without FPU" and "Kernel Space".
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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_INT32` and `MRB_INT64`.
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`MRB_INT32`
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* When defined, or both `MRB_INT16` and `MRB_INT64` are not defined on 32-bit CPU mode, `int32_t` will be defined as `mrb_int`.
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* Conflicts with `MRB_INT16` and `MRB_INT64`.
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`MRB_INT64`
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* When defined, or both `MRB_INT16` and `MRB_INT32` are not defined on 64-bit CPU mode, `int64_t` will be defined as `mrb_int`.
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* Conflicts with `MRB_INT16` and `MRB_INT32`.
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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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`MRB_HEAP_PAGE_SIZE`
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* Defines value is `1024`.
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* Specifies number of `RBasic` per each heap page.
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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` and `MRB_WITHOUT_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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## Instance variable configuration.
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`MRB_IV_SEGMENT_SIZE`
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* Default value is `4`.
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* Specifies size of each segment in segment list.
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## Reduce heap memory configuration.
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`MRB_USE_LINK_TIME_RO_DATA_P`
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* Only available on ELF platforms.
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* If you specify the address of a read-only section when creating a symbol or string, that string will be used as it is.
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* Heap memory can be saved.
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* Uses `__ehdr_start` and `__init_array_start`.
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* It must be `__ehdr_start < data_addr < __init_array_start`.
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`MRB_USE_CUSTOM_RO_DATA_P`
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* Takes precedence over `MRB_USE_LINK_TIME_RO_DATA_P`.
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* Please try if `MRB_USE_LINK_TIME_RO_DATA_P` is not available.
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* The `mrb_ro_data_p()` function is implemented by the user in an arbitrary file.
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* The prototype declaration is `mrb_bool mrb_ro_data_p(const char *ptr)`.
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* Return `TRUE` if `ptr` is in read-only section, otherwise return `FALSE`.
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## Other configuration.
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`MRB_UTF8_STRING`
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* Adds UTF-8 encoding support to character-oriented String instance methods.
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* If it isn't defined, they only support the US-ASCII encoding.
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`MRB_FUNCALL_ARGC_MAX`
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* Default value is `16`.
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* Specifies 4th argument(`argc`) max value of `mrb_funcall`.
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* Raises `ArgumentError` when the `argc` argument is bigger then this value `mrb_funcall`.
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`KHASH_DEFAULT_SIZE`
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* Default value is `32`.
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* Specifies default size of khash table bucket.
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* Used in `kh_init_ ## name` function.
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`MRB_STR_BUF_MIN_SIZE`
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* Default value is `128`.
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* Specifies initial capacity of `RString` created by `mrb_str_buf_new` function..
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`MRB_METHOD_CACHE`
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* Improve performance for method dispatch.
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`MRB_METHOD_CACHE_SIZE`
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* Default value is `128`.
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* Ignored if `MRB_METHOD_CACHE` is not defined.
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* Need to be the power of 2.
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`MRB_METHOD_T_STRUCT`
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* Use C struct to represent `mrb_method_t`
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* No `MRB_METHOD_T_STRUCT` requires highest 2 bits of function pointers to be zero
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* Define this macro on machines that use higher bits of pointers
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`MRB_ENABLE_ALL_SYMBOLS`
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* Make it available `Symbols.all_symbols` in `mrbgems/mruby-symbol-ext`
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* Increase heap memory usage.
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