split internal.h into files

One day, I could not resist the way it was written.  I finally started
to make the code clean.  This changeset is the beginning of a series of
housekeeping commits.  It is a simple refactoring; split internal.h into
files, so that we can divide and concur in the upcoming commits.  No
lines of codes are either added or removed, except the obvious file
headers/footers.  The generated binary is identical to the one before.

internal/imemo.h

@@ -0,0 +1,212 @@
+#ifndef INTERNAL_IMEMO_H /* -*- C -*- */
+#define INTERNAL_IMEMO_H
+/**
+ * @file
+ * @brief      IMEMO: Internal memo object.
+ * @author     \@shyouhei
+ * @copyright  This  file  is   a  part  of  the   programming  language  Ruby.
+ *             Permission  is hereby  granted,  to  either redistribute  and/or
+ *             modify this file, provided that  the conditions mentioned in the
+ *             file COPYING are met.  Consult the file for details.
+ */
+
+#ifndef IMEMO_DEBUG
+#define IMEMO_DEBUG 0
+#endif
+
+struct RIMemo {
+    VALUE flags;
+    VALUE v0;
+    VALUE v1;
+    VALUE v2;
+    VALUE v3;
+};
+
+enum imemo_type {
+    imemo_env            =  0,
+    imemo_cref           =  1, /*!< class reference */
+    imemo_svar           =  2, /*!< special variable */
+    imemo_throw_data     =  3,
+    imemo_ifunc          =  4, /*!< iterator function */
+    imemo_memo           =  5,
+    imemo_ment           =  6,
+    imemo_iseq           =  7,
+    imemo_tmpbuf         =  8,
+    imemo_ast            =  9,
+    imemo_parser_strterm = 10
+};
+#define IMEMO_MASK   0x0f
+
+static inline enum imemo_type
+imemo_type(VALUE imemo)
+{
+    return (RBASIC(imemo)->flags >> FL_USHIFT) & IMEMO_MASK;
+}
+
+static inline int
+imemo_type_p(VALUE imemo, enum imemo_type imemo_type)
+{
+    if (LIKELY(!RB_SPECIAL_CONST_P(imemo))) {
+        /* fixed at compile time if imemo_type is given. */
+        const VALUE mask = (IMEMO_MASK << FL_USHIFT) | RUBY_T_MASK;
+        const VALUE expected_type = (imemo_type << FL_USHIFT) | T_IMEMO;
+        /* fixed at runtime. */
+        return expected_type == (RBASIC(imemo)->flags & mask);
+    }
+    else {
+        return 0;
+    }
+}
+
+VALUE rb_imemo_new(enum imemo_type type, VALUE v1, VALUE v2, VALUE v3, VALUE v0);
+
+/* FL_USER0 to FL_USER3 is for type */
+#define IMEMO_FL_USHIFT (FL_USHIFT + 4)
+#define IMEMO_FL_USER0 FL_USER4
+#define IMEMO_FL_USER1 FL_USER5
+#define IMEMO_FL_USER2 FL_USER6
+#define IMEMO_FL_USER3 FL_USER7
+#define IMEMO_FL_USER4 FL_USER8
+
+/* CREF (Class REFerence) is defined in method.h */
+
+/*! SVAR (Special VARiable) */
+struct vm_svar {
+    VALUE flags;
+    const VALUE cref_or_me; /*!< class reference or rb_method_entry_t */
+    const VALUE lastline;
+    const VALUE backref;
+    const VALUE others;
+};
+
+
+#define THROW_DATA_CONSUMED IMEMO_FL_USER0
+
+/*! THROW_DATA */
+struct vm_throw_data {
+    VALUE flags;
+    VALUE reserved;
+    const VALUE throw_obj;
+    const struct rb_control_frame_struct *catch_frame;
+    int throw_state;
+};
+
+#define THROW_DATA_P(err) RB_TYPE_P((VALUE)(err), T_IMEMO)
+
+/* IFUNC (Internal FUNCtion) */
+
+struct vm_ifunc_argc {
+#if SIZEOF_INT * 2 > SIZEOF_VALUE
+    signed int min: (SIZEOF_VALUE * CHAR_BIT) / 2;
+    signed int max: (SIZEOF_VALUE * CHAR_BIT) / 2;
+#else
+    int min, max;
+#endif
+};
+
+/*! IFUNC (Internal FUNCtion) */
+struct vm_ifunc {
+    VALUE flags;
+    VALUE reserved;
+    rb_block_call_func_t func;
+    const void *data;
+    struct vm_ifunc_argc argc;
+};
+
+#define IFUNC_NEW(a, b, c) ((struct vm_ifunc *)rb_imemo_new(imemo_ifunc, (VALUE)(a), (VALUE)(b), (VALUE)(c), 0))
+struct vm_ifunc *rb_vm_ifunc_new(rb_block_call_func_t func, const void *data, int min_argc, int max_argc);
+static inline struct vm_ifunc *
+rb_vm_ifunc_proc_new(rb_block_call_func_t func, const void *data)
+{
+    return rb_vm_ifunc_new(func, data, 0, UNLIMITED_ARGUMENTS);
+}
+
+typedef struct rb_imemo_tmpbuf_struct {
+    VALUE flags;
+    VALUE reserved;
+    VALUE *ptr; /* malloc'ed buffer */
+    struct rb_imemo_tmpbuf_struct *next; /* next imemo */
+    size_t cnt; /* buffer size in VALUE */
+} rb_imemo_tmpbuf_t;
+
+#define rb_imemo_tmpbuf_auto_free_pointer() rb_imemo_new(imemo_tmpbuf, 0, 0, 0, 0)
+rb_imemo_tmpbuf_t *rb_imemo_tmpbuf_parser_heap(void *buf, rb_imemo_tmpbuf_t *old_heap, size_t cnt);
+
+#define RB_IMEMO_TMPBUF_PTR(v) \
+    ((void *)(((const struct rb_imemo_tmpbuf_struct *)(v))->ptr))
+
+static inline void *
+rb_imemo_tmpbuf_set_ptr(VALUE v, void *ptr)
+{
+    return ((rb_imemo_tmpbuf_t *)v)->ptr = ptr;
+}
+
+static inline VALUE
+rb_imemo_tmpbuf_auto_free_pointer_new_from_an_RString(VALUE str)
+{
+    const void *src;
+    VALUE imemo;
+    rb_imemo_tmpbuf_t *tmpbuf;
+    void *dst;
+    size_t len;
+
+    SafeStringValue(str);
+    /* create tmpbuf to keep the pointer before xmalloc */
+    imemo = rb_imemo_tmpbuf_auto_free_pointer();
+    tmpbuf = (rb_imemo_tmpbuf_t *)imemo;
+    len = RSTRING_LEN(str);
+    src = RSTRING_PTR(str);
+    dst = ruby_xmalloc(len);
+    memcpy(dst, src, len);
+    tmpbuf->ptr = dst;
+    return imemo;
+}
+
+void rb_strterm_mark(VALUE obj);
+
+/*! MEMO
+ *
+ * @see imemo_type
+ * */
+struct MEMO {
+    VALUE flags;
+    VALUE reserved;
+    const VALUE v1;
+    const VALUE v2;
+    union {
+        long cnt;
+        long state;
+        const VALUE value;
+        void (*func)(void);
+    } u3;
+};
+
+#define MEMO_V1_SET(m, v) RB_OBJ_WRITE((m), &(m)->v1, (v))
+#define MEMO_V2_SET(m, v) RB_OBJ_WRITE((m), &(m)->v2, (v))
+
+#define MEMO_CAST(m) ((struct MEMO *)m)
+
+#define MEMO_NEW(a, b, c) ((struct MEMO *)rb_imemo_new(imemo_memo, (VALUE)(a), (VALUE)(b), (VALUE)(c), 0))
+
+#define roomof(x, y) (((x) + (y) - 1) / (y))
+#define type_roomof(x, y) roomof(sizeof(x), sizeof(y))
+#define MEMO_FOR(type, value) ((type *)RARRAY_PTR(value))
+#define NEW_MEMO_FOR(type, value) \
+  ((value) = rb_ary_tmp_new_fill(type_roomof(type, VALUE)), MEMO_FOR(type, value))
+#define NEW_PARTIAL_MEMO_FOR(type, value, member) \
+  ((value) = rb_ary_tmp_new_fill(type_roomof(type, VALUE)), \
+   rb_ary_set_len((value), offsetof(type, member) / sizeof(VALUE)), \
+   MEMO_FOR(type, value))
+
+/* ment is in method.h */
+
+RUBY_SYMBOL_EXPORT_BEGIN
+#if IMEMO_DEBUG
+VALUE rb_imemo_new_debug(enum imemo_type type, VALUE v1, VALUE v2, VALUE v3, VALUE v0, const char *file, int line);
+#define rb_imemo_new(type, v1, v2, v3, v0) rb_imemo_new_debug(type, v1, v2, v3, v0, __FILE__, __LINE__)
+#else
+VALUE rb_imemo_new(enum imemo_type type, VALUE v1, VALUE v2, VALUE v3, VALUE v0);
+#endif
+RUBY_SYMBOL_EXPORT_END
+
+#endif /* INTERNAL_IMEMO_H */