diff options
Diffstat (limited to 'erts')
| -rw-r--r-- | erts/emulator/beam/global.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/erts/emulator/beam/global.h b/erts/emulator/beam/global.h index ee1f70b748..07806c823c 100644 --- a/erts/emulator/beam/global.h +++ b/erts/emulator/beam/global.h @@ -777,6 +777,15 @@ ErtsPStack s = { (byte*)PSTK_DEF_STACK(s), /* pstart */ \ ERTS_ALC_T_ESTACK /* alloc_type */ \ } +#define PSTACK_CHANGE_ALLOCATOR(s,t) \ +do { \ + if (s.pstart != (byte*)PSTK_DEF_STACK(s)) { \ + erl_exit(1, "Internal error - trying to change allocator " \ + "type of active pstack\n"); \ + } \ + s.alloc_type = (t); \ + } while (0) + #define PSTACK_DESTROY(s) \ do { \ if (s.pstart != (byte*)PSTK_DEF_STACK(s)) { \ @@ -786,6 +795,8 @@ do { \ #define PSTACK_IS_EMPTY(s) (s.psp < s.pstart) +#define PSTACK_COUNT(s) (((PSTACK_TYPE*)s.psp + 1) - (PSTACK_TYPE*)s.pstart) + #define PSTACK_TOP(s) (ASSERT(!PSTACK_IS_EMPTY(s)), (PSTACK_TYPE*)(s.psp)) #define PSTACK_PUSH(s) \ @@ -796,6 +807,37 @@ do { \ #define PSTACK_POP(s) ((PSTACK_TYPE*) (s.psp -= sizeof(PSTACK_TYPE))) +/* + * Do not free the stack after this, it may have pointers into what + * was saved in 'dst'. + */ +#define PSTACK_SAVE(s,dst)\ +do {\ + if (s.pstart == (byte*)PSTK_DEF_STACK(s)) {\ + UWord _pbytes = PSTACK_COUNT(s) * sizeof(PSTACK_TYPE);\ + (dst)->pstart = erts_alloc(s.alloc_type,\ + sizeof(PSTK_DEF_STACK(s)));\ + memcpy((dst)->pstart, s.pstart, _pbytes);\ + (dst)->psp = (dst)->pstart + _pbytes - sizeof(PSTACK_TYPE);\ + (dst)->pend = (dst)->pstart + sizeof(PSTK_DEF_STACK(s));\ + (dst)->alloc_type = s.alloc_type;\ + } else\ + *(dst) = s;\ + } while (0) + +/* + * Use on empty stack, only the allocator can be changed before this. + * The src stack is reset to NULL. + */ +#define PSTACK_RESTORE(s, src) \ +do { \ + ASSERT(s.pstart == (byte*)PSTK_DEF_STACK(s)); \ + s = *(src); /* struct copy */ \ + (src)->pstart = NULL; \ + ASSERT(s.psp >= (s.pstart - sizeof(PSTACK_TYPE))); \ + ASSERT(s.psp < s.pend); \ +} while (0) + /* binary.c */ |