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boxing_word.h: allow 4 byte alignment of object pointers

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Only if MRB_WORDBOX_NO_FLOAT_TRUNCATE or MRB_NO_FLOAT is defined.
This commit is contained in:
Yukihiro "Matz" Matsumoto
2025-03-30 23:23:02 +09:00
parent 39fbc96eaf
commit 206eccb828
1 changed files with 9 additions and 2 deletions
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include/mruby/boxing_word.h
+9 -2
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@@ -50,8 +50,9 @@ enum mrb_special_consts {
#define WORDBOX_FIXNUM_FLAG (1 << (WORDBOX_FIXNUM_BIT_POS - 1))
#define WORDBOX_FIXNUM_MASK ((1 << WORDBOX_FIXNUM_BIT_POS) - 1)
#if defined(MRB_WORDBOX_NO_FLOAT_TRUNCATE)
#if defined(MRB_WORDBOX_NO_FLOAT_TRUNCATE) || defined(MRB_NO_FLOAT)
/* floats are allocated in heaps */
#define WORDBOX_IMMEDIATE_MASK 0x03
#define WORDBOX_SYMBOL_BIT_POS 2
#define WORDBOX_SYMBOL_SHIFT WORDBOX_SYMBOL_BIT_POS
#define WORDBOX_SYMBOL_FLAG (1 << (WORDBOX_SYMBOL_BIT_POS - 1))
@@ -68,7 +69,9 @@ enum mrb_special_consts {
#define WORDBOX_SYMBOL_MASK 0x1f
#endif
#ifndef WORDBOX_IMMEDIATE_MASK
#define WORDBOX_IMMEDIATE_MASK 0x07
#endif
#define WORDBOX_SET_SHIFT_VALUE(o,n,v) \
((o).w = (((uintptr_t)(v)) << WORDBOX_##n##_SHIFT) | WORDBOX_##n##_FLAG)
@@ -107,7 +110,7 @@ enum mrb_special_consts {
* undef : ...0001 0100
* fixnum: ...IIII III1
* symbol: ...SSSS SS10
* object: ...PPPP P000 (any bits are 1)
* object: ...PPPP PP00 (any bits are 1)
*/
typedef struct mrb_value {
uintptr_t w;
@@ -145,7 +148,11 @@ MRB_API mrb_value mrb_word_boxing_float_value(struct mrb_state*, mrb_float);
#endif
MRB_API mrb_value mrb_boxing_int_value(struct mrb_state*, mrb_int);
#if WORDBOX_IMMEDIATE_MASK == 0x3
#define mrb_immediate_p(o) ((o).w & WORDBOX_IMMEDIATE_MASK || (o).w <= MRB_Qundef)
#else
#define mrb_immediate_p(o) ((o).w & WORDBOX_IMMEDIATE_MASK || (o).w == MRB_Qnil)
#endif
#define mrb_ptr(o) mrb_val_union(o).p
#define mrb_cptr(o) mrb_val_union(o).vp->p