DISABLE_STDIO/ENABLE_DEBUG macros to rename; close #3014

changes:
 * rename DISABLE_STDIO -> MRB_DISABLE_STDIO
 * rename ENABLE_DEBUG -> MRB_ENABLE_DEBUG_HOOK
 * no more opposite macro definitions (e.g. ENABLE_STDIO, DISABLE_DEBUG).
 * rewrite above macro references throughout the code.
 * update documents

19 files changed, 56 insertions, 74 deletions

diff --git a/build_config.rb b/build_config.rb
index 526bf1cf1..598118eb3 100644
--- a/build_config.rb
+++ b/build_config.rb
@@ -98,7 +98,7 @@ MRuby::Build.new('host-debug') do |conf|
   conf.gembox 'default'
 
   # C compiler settings
-  conf.cc.defines = %w(ENABLE_DEBUG)
+  conf.cc.defines = %w(MRB_ENABLE_DEBUG)
 
   # Generate mruby debugger command (require mruby-eval)
   conf.gem :core => "mruby-bin-debugger"
diff --git a/doc/guides/compile.md b/doc/guides/compile.md
index 16df2b804..a1c89882a 100644
--- a/doc/guides/compile.md
+++ b/doc/guides/compile.md
@@ -463,7 +463,7 @@ can't be disabled for the main build.
 MRuby::CrossBuild.new('Minimal') do |conf|
   toolchain :gcc
 
-  conf.cc.defines = %w(DISABLE_STDIO)
+  conf.cc.defines = %w(MRB_DISABLE_STDIO)
   conf.bins = []
 end
 ```
diff --git a/doc/guides/mrbconf.md b/doc/guides/mrbconf.md
index dfff41898..8a5ea4d87 100644
--- a/doc/guides/mrbconf.md
+++ b/doc/guides/mrbconf.md
@@ -11,11 +11,7 @@ You can use mrbconfs with following ways:
  changes `struct` layout and cause memory access error when C and other language(e.g., C++) is mixed.
 
 ## stdio setting.
-`ENABLE_STDIO`
-* Will be defined automatically if `DISABLE_STDIO` isn't defined.
-* Uses `<stdio.h>` functions.
-
-`DISABLE_STDIO`
+`MRB_DISABLE_STDIO`
 * When defined `<stdio.h>` functions won't be used.
 * Some features will be disabled when this is enabled:
   * `mrb_irep` load/dump from/to file.
@@ -23,15 +19,12 @@ You can use mrbconfs with following ways:
   * Printing features in **src/print.c**.
 
 ## Debug macros.
-`ENABLE_DEBUG`
+`MRB_ENABLE_DEBUG_HOOK`
 * When defined code fetch hook and debug OP hook will be enabled.
 * When using any of the hook set function pointer `code_fetch_hook` and/or `debug_op_hook` of `mrb_state`.
 * Fetch hook will be called before any OP.
 * Debug OP hook will be called when dispatching `OP_DEBUG`.
 
-`DISABLE_DEBUG`
-* Will be define automatically if `ENABLE_DEBUG` isn't defined.
-
 `MRB_DEBUG`
 * When defined `mrb_assert*` macro will be defined with macros from `<assert.h>`.
 * Could be enabled via `enable_debug` method of `MRuby::Build`.
diff --git a/examples/targets/build_config_ArduinoDue.rb b/examples/targets/build_config_ArduinoDue.rb
index 194fcb0f4..740dcfa02 100644
--- a/examples/targets/build_config_ArduinoDue.rb
+++ b/examples/targets/build_config_ArduinoDue.rb
@@ -50,7 +50,7 @@ MRuby::CrossBuild.new("ArduinoDue") do |conf|
     cc.defines << %w(KHASH_DEFAULT_SIZE=8)
     cc.defines << %w(MRB_STR_BUF_MIN_SIZE=20)
     cc.defines << %w(MRB_GC_STRESS)
-    #cc.defines << %w(DISABLE_STDIO) #if you dont need stdio.
+    #cc.defines << %w(MRB_DISABLE_STDIO) #if you dont need stdio.
     #cc.defines << %w(POOL_PAGE_SIZE=1000) #effective only for use with mruby-eval
   end
 
diff --git a/examples/targets/build_config_chipKITMax32.rb b/examples/targets/build_config_chipKITMax32.rb
index e3a122f43..c3a146e4e 100644
--- a/examples/targets/build_config_chipKITMax32.rb
+++ b/examples/targets/build_config_chipKITMax32.rb
@@ -47,7 +47,7 @@ MRuby::CrossBuild.new("chipKITMax32") do |conf|
     cc.defines << %w(KHASH_DEFAULT_SIZE=8)
     cc.defines << %w(MRB_STR_BUF_MIN_SIZE=20)
     cc.defines << %w(MRB_GC_STRESS)
-    #cc.defines << %w(DISABLE_STDIO) #if you dont need stdio.
+    #cc.defines << %w(MRB_DISABLE_STDIO) #if you dont need stdio.
     #cc.defines << %w(POOL_PAGE_SIZE=1000) #effective only for use with mruby-eval
   end
 
diff --git a/include/mrbconf.h b/include/mrbconf.h
index a35ca86bb..a945d4774 100644
--- a/include/mrbconf.h
+++ b/include/mrbconf.h
@@ -75,23 +75,25 @@
 /* fixed size state atexit stack */
 //#define MRB_FIXED_STATE_ATEXIT_STACK
 
-/* -DDISABLE_XXXX to drop following features */
-//#define DISABLE_STDIO		/* use of stdio */
+/* -DMRB_DISABLE_XXXX to drop following features */
+//#define MRB_DISABLE_STDIO	/* use of stdio */
 
-/* -DENABLE_XXXX to enable following features */
-//#define ENABLE_DEBUG		/* hooks for debugger */
+/* -DMRB_ENABLE_XXXX to enable following features */
+//#define MRB_ENABLE_DEBUG_HOOK	/* hooks for debugger */
 
 /* end of configuration */
 
-/* define ENABLE_XXXX from DISABLE_XXX */
-#ifndef DISABLE_STDIO
-#define ENABLE_STDIO
+/* define MRB_DISABLE_XXXX from DISABLE_XXX (for compatibility) */
+#ifdef DISABLE_STDIO
+#define MRB_DIABLE_STDIO
 #endif
-#ifndef ENABLE_DEBUG
-#define DISABLE_DEBUG
+
+/* define MRB_ENABLE_XXXX from ENABLE_XXX (for compatibility) */
+#ifdef ENABLE_DEBUG
+#define MRB_ENABLE_DEBUG_HOOK
 #endif
 
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
 # include <stdio.h>
 #endif
 
diff --git a/include/mruby.h b/include/mruby.h
index 06b3beb8c..49de55f69 100644
--- a/include/mruby.h
+++ b/include/mruby.h
@@ -152,7 +152,7 @@ typedef struct mrb_state {
   struct symbol_name *symtbl;   /* symbol table */
   size_t symcapa;
 
-#ifdef ENABLE_DEBUG
+#ifdef MRB_ENABLE_DEBUG_HOOK
   void (*code_fetch_hook)(struct mrb_state* mrb, struct mrb_irep *irep, mrb_code *pc, mrb_value *regs);
   void (*debug_op_hook)(struct mrb_state* mrb, struct mrb_irep *irep, mrb_code *pc, mrb_value *regs);
 #endif
diff --git a/include/mruby/compile.h b/include/mruby/compile.h
index 637b469a8..91ea9463f 100644
--- a/include/mruby/compile.h
+++ b/include/mruby/compile.h
@@ -112,7 +112,7 @@ struct mrb_parser_state {
   struct mrb_pool *pool;
   mrb_ast_node *cells;
   const char *s, *send;
-#ifdef ENABLE_STDIO
+#ifndef MRB_DIABLE_STDIO
   FILE *f;
 #endif
   mrbc_context *cxt;
@@ -167,7 +167,7 @@ MRB_API void mrb_parser_set_filename(struct mrb_parser_state*, char const*);
 MRB_API char const* mrb_parser_get_filename(struct mrb_parser_state*, uint16_t idx);
 
 /* utility functions */
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
 MRB_API struct mrb_parser_state* mrb_parse_file(mrb_state*,FILE*,mrbc_context*);
 #endif
 MRB_API struct mrb_parser_state* mrb_parse_string(mrb_state*,const char*,mrbc_context*);
@@ -175,14 +175,12 @@ MRB_API struct mrb_parser_state* mrb_parse_nstring(mrb_state*,const char*,int,mr
 MRB_API struct RProc* mrb_generate_code(mrb_state*, struct mrb_parser_state*);
 
 /* program load functions */
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
 MRB_API mrb_value mrb_load_file(mrb_state*,FILE*);
+MRB_API mrb_value mrb_load_file_cxt(mrb_state*,FILE*, mrbc_context *cxt);
 #endif
 MRB_API mrb_value mrb_load_string(mrb_state *mrb, const char *s);
 MRB_API mrb_value mrb_load_nstring(mrb_state *mrb, const char *s, int len);
-#ifdef ENABLE_STDIO
-MRB_API mrb_value mrb_load_file_cxt(mrb_state*,FILE*, mrbc_context *cxt);
-#endif
 MRB_API mrb_value mrb_load_string_cxt(mrb_state *mrb, const char *s, mrbc_context *cxt);
 MRB_API mrb_value mrb_load_nstring_cxt(mrb_state *mrb, const char *s, int len, mrbc_context *cxt);
 
diff --git a/include/mruby/dump.h b/include/mruby/dump.h
index 6a36cbce6..488a657ef 100644
--- a/include/mruby/dump.h
+++ b/include/mruby/dump.h
@@ -23,7 +23,7 @@ MRB_BEGIN_DECL
 #define DUMP_ENDIAN_MASK 6
 
 int mrb_dump_irep(mrb_state *mrb, mrb_irep *irep, uint8_t flags, uint8_t **bin, size_t *bin_size);
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
 int mrb_dump_irep_binary(mrb_state*, mrb_irep*, uint8_t, FILE*);
 int mrb_dump_irep_cfunc(mrb_state *mrb, mrb_irep*, uint8_t flags, FILE *f, const char *initname);
 mrb_irep *mrb_read_irep_file(mrb_state*, FILE*);
diff --git a/mrbgems/mruby-bin-mruby/tools/mruby/mruby.c b/mrbgems/mruby-bin-mruby/tools/mruby/mruby.c
index cc1ca3055..4b801bb3b 100644
--- a/mrbgems/mruby-bin-mruby/tools/mruby/mruby.c
+++ b/mrbgems/mruby-bin-mruby/tools/mruby/mruby.c
@@ -7,7 +7,7 @@
 #include "mruby/dump.h"
 #include "mruby/variable.h"
 
-#ifndef ENABLE_STDIO
+#ifdef MRB_DISABLE_STDIO
 static void
 p(mrb_state *mrb, mrb_value obj)
 {
diff --git a/mrbgems/mruby-compiler/core/codegen.c b/mrbgems/mruby-compiler/core/codegen.c
index d9a8e463e..b47c1c623 100644
--- a/mrbgems/mruby-compiler/core/codegen.c
+++ b/mrbgems/mruby-compiler/core/codegen.c
@@ -96,7 +96,7 @@ codegen_error(codegen_scope *s, const char *message)
     mrb_pool_close(s->mpool);
     s = tmp;
   }
-#ifdef ENABLE_STDIO
+#ifndef MBB_DISABLE_STDIO
   if (s->filename && s->lineno) {
     fprintf(stderr, "codegen error:%s:%d: %s\n", s->filename, s->lineno, message);
   }
@@ -375,7 +375,7 @@ dispatch(codegen_scope *s, int pc)
   case OP_ONERR:
     break;
   default:
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
     fprintf(stderr, "bug: dispatch on non JMP op\n");
 #endif
     scope_error(s);
@@ -978,7 +978,7 @@ gen_assignment(codegen_scope *s, node *tree, int sp, int val)
     break;
 
   default:
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
     printf("unknown lhs %d\n", type);
 #endif
     break;
diff --git a/mrbgems/mruby-compiler/core/parse.y b/mrbgems/mruby-compiler/core/parse.y
index 4cd385d65..032e9e16b 100644
--- a/mrbgems/mruby-compiler/core/parse.y
+++ b/mrbgems/mruby-compiler/core/parse.y
@@ -3294,7 +3294,7 @@ yyerror(parser_state *p, const char *s)
   int n;
 
   if (! p->capture_errors) {
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
     if (p->filename) {
       fprintf(stderr, "%s:%d:%d: %s\n", p->filename, p->lineno, p->column, s);
     }
@@ -3330,7 +3330,7 @@ yywarn(parser_state *p, const char *s)
   int n;
 
   if (! p->capture_errors) {
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
     if (p->filename) {
       fprintf(stderr, "%s:%d:%d: %s\n", p->filename, p->lineno, p->column, s);
     }
@@ -3401,7 +3401,7 @@ nextc(parser_state *p)
     cons_free(tmp);
   }
   else {
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
     if (p->f) {
       if (feof(p->f)) goto eof;
       c = fgetc(p->f);
@@ -3491,7 +3491,7 @@ peeks(parser_state *p, const char *s)
 {
   int len = strlen(s);
 
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
   if (p->f) {
     int n = 0;
     while (*s) {
@@ -5442,7 +5442,7 @@ mrb_parser_new(mrb_state *mrb)
   p->pool = pool;
 
   p->s = p->send = NULL;
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISBLE_STDIO
   p->f = NULL;
 #endif
 
@@ -5541,7 +5541,7 @@ mrb_parser_get_filename(struct mrb_parser_state* p, uint16_t idx) {
   }
 }
 
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
 MRB_API parser_state*
 mrb_parse_file(mrb_state *mrb, FILE *f, mrbc_context *c)
 {
@@ -5633,7 +5633,7 @@ load_exec(mrb_state *mrb, parser_state *p, mrbc_context *c)
   return v;
 }
 
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
 MRB_API mrb_value
 mrb_load_file_cxt(mrb_state *mrb, FILE *f, mrbc_context *c)
 {
@@ -5671,7 +5671,7 @@ mrb_load_string(mrb_state *mrb, const char *s)
   return mrb_load_string_cxt(mrb, s, NULL);
 }
 
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
 
 static void
 dump_prefix(node *tree, int offset)
@@ -5697,7 +5697,7 @@ dump_recur(mrb_state *mrb, node *tree, int offset)
 void
 mrb_parser_dump(mrb_state *mrb, node *tree, int offset)
 {
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
   int nodetype;
 
   if (!tree) return;
diff --git a/src/backtrace.c b/src/backtrace.c
index a672a6c95..cbf89e09d 100644
--- a/src/backtrace.c
+++ b/src/backtrace.c
@@ -25,7 +25,7 @@ struct backtrace_location {
 
 typedef void (*output_stream_func)(mrb_state*, struct backtrace_location*, void*);
 
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
 
 struct print_backtrace_args {
   FILE *stream;
@@ -165,7 +165,7 @@ exc_output_backtrace(mrb_state *mrb, struct RObject *exc, output_stream_func fun
    overwritten.  So invoke these functions just after detecting exceptions.
 */
 
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
 
 MRB_API void
 mrb_print_backtrace(mrb_state *mrb)
diff --git a/src/codedump.c b/src/codedump.c
index d87c729f9..6db5c6596 100644
--- a/src/codedump.c
+++ b/src/codedump.c
@@ -5,7 +5,7 @@
 #include "mruby/string.h"
 #include "mruby/proc.h"
 
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
 static int
 print_r(mrb_state *mrb, mrb_irep *irep, size_t n, int pre)
 {
@@ -53,7 +53,7 @@ print_lv(mrb_state *mrb, mrb_irep *irep, mrb_code c, int r)
 static void
 codedump(mrb_state *mrb, mrb_irep *irep)
 {
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
   int i;
   int ai;
   mrb_code c;
diff --git a/src/dump.c b/src/dump.c
index 734f38043..6a70eacaa 100644
--- a/src/dump.c
+++ b/src/dump.c
@@ -989,7 +989,7 @@ mrb_dump_irep(mrb_state *mrb, mrb_irep *irep, uint8_t flags, uint8_t **bin, size
   return dump_irep(mrb, irep, dump_flags(flags, FLAG_BYTEORDER_NONATIVE), bin, bin_size);
 }
 
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
 
 int
 mrb_dump_irep_binary(mrb_state *mrb, mrb_irep *irep, uint8_t flags, FILE* fp)
@@ -1092,4 +1092,4 @@ mrb_dump_irep_cfunc(mrb_state *mrb, mrb_irep *irep, uint8_t flags, FILE *fp, con
   return result;
 }
 
-#endif /* ENABLE_STDIO */
+#endif /* MRB_DISABLE_STDIO */
diff --git a/src/error.c b/src/error.c
index 66e552557..e2bcebb60 100644
--- a/src/error.c
+++ b/src/error.c
@@ -309,7 +309,7 @@ mrb_name_error(mrb_state *mrb, mrb_sym id, const char *fmt, ...)
 MRB_API void
 mrb_warn(mrb_state *mrb, const char *fmt, ...)
 {
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
   va_list ap;
   mrb_value str;
 
@@ -324,7 +324,7 @@ mrb_warn(mrb_state *mrb, const char *fmt, ...)
 MRB_API mrb_noreturn void
 mrb_bug(mrb_state *mrb, const char *fmt, ...)
 {
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
   va_list ap;
   mrb_value str;
 
diff --git a/src/load.c b/src/load.c
index 36fae9aee..aa8c501e5 100644
--- a/src/load.c
+++ b/src/load.c
@@ -642,7 +642,7 @@ mrb_load_irep(mrb_state *mrb, const uint8_t *bin)
   return mrb_load_irep_cxt(mrb, bin, NULL);
 }
 
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
 
 MRB_API mrb_irep*
 mrb_read_irep_file(mrb_state *mrb, FILE* fp)
@@ -704,4 +704,4 @@ mrb_load_irep_file(mrb_state *mrb, FILE* fp)
 {
   return mrb_load_irep_file_cxt(mrb, fp, NULL);
 }
-#endif /* ENABLE_STDIO */
+#endif /* MRB_DISABLE_STDIO */
diff --git a/src/print.c b/src/print.c
index 077fa4f06..111145a34 100644
--- a/src/print.c
+++ b/src/print.c
@@ -8,7 +8,7 @@
 #include "mruby/string.h"
 #include "mruby/variable.h"
 
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
 static void
 printstr(mrb_value obj, FILE *stream)
 {
@@ -24,35 +24,24 @@ printstr(mrb_value obj, FILE *stream)
 MRB_API void
 mrb_p(mrb_state *mrb, mrb_value obj)
 {
-  mrb_value val = mrb_inspect(mrb, obj);
-
-  printstr(val, stdout);
+  printstr(mrb_inspect(mrb, obj), stdout);
 }
 
 MRB_API void
 mrb_print_error(mrb_state *mrb)
 {
-  mrb_value s;
-
   mrb_print_backtrace(mrb);
-  s = mrb_funcall(mrb, mrb_obj_value(mrb->exc), "inspect", 0);
-  printstr(s, stderr);
+  printstr(mrb_funcall(mrb, mrb_obj_value(mrb->exc), "inspect", 0), stderr);
 }
 
 MRB_API void
 mrb_show_version(mrb_state *mrb)
 {
-  mrb_value msg;
-
-  msg = mrb_const_get(mrb, mrb_obj_value(mrb->object_class), mrb_intern_lit(mrb, "MRUBY_DESCRIPTION"));
-  printstr(msg, stdout);
+  printstr(mrb_const_get(mrb, mrb_obj_value(mrb->object_class), mrb_intern_lit(mrb, "MRUBY_DESCRIPTION")), stdout);
 }
 
 MRB_API void
 mrb_show_copyright(mrb_state *mrb)
 {
-  mrb_value msg;
-
-  msg = mrb_const_get(mrb, mrb_obj_value(mrb->object_class), mrb_intern_lit(mrb, "MRUBY_COPYRIGHT"));
-  printstr(msg, stdout);
+  printstr(mrb_const_get(mrb, mrb_obj_value(mrb->object_class), mrb_intern_lit(mrb, "MRUBY_COPYRIGHT")), stdout);
 }
diff --git a/src/vm.c b/src/vm.c
index 34aeddb94..174c04112 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -22,7 +22,7 @@
 #include "value_array.h"
 #include "mruby/throw.h"
 
-#ifndef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
 #if defined(__cplusplus)
 extern "C" {
 #endif
@@ -693,7 +693,7 @@ argnum_error(mrb_state *mrb, mrb_int num)
 
 #define ERR_PC_SET(mrb, pc) mrb->c->ci->err = pc;
 #define ERR_PC_CLR(mrb)     mrb->c->ci->err = 0;
-#ifdef ENABLE_DEBUG
+#ifdef MRB_ENABLE_DEBUG_HOOK
 #define CODE_FETCH_HOOK(mrb, irep, pc, regs) if ((mrb)->code_fetch_hook) (mrb)->code_fetch_hook((mrb), (irep), (pc), (regs));
 #else
 #define CODE_FETCH_HOOK(mrb, irep, pc, regs)
@@ -2340,10 +2340,10 @@ RETRY_TRY_BLOCK:
 
     CASE(OP_DEBUG) {
       /* A B C    debug print R(A),R(B),R(C) */
-#ifdef ENABLE_DEBUG
+#ifdef MRB_ENABLE_DEBUG_HOOK
       mrb->debug_op_hook(mrb, irep, pc, regs);
 #else
-#ifdef ENABLE_STDIO
+#ifndef MRB_DISABLE_STDIO
       printf("OP_DEBUG %d %d %d\n", GETARG_A(i), GETARG_B(i), GETARG_C(i));
 #else
       abort();