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authorSverker Eriksson <[email protected]>2015-06-02 19:23:25 +0200
committerSverker Eriksson <[email protected]>2015-06-02 19:23:25 +0200
commit512c321bdaf25b685124405e287a3839be467149 (patch)
tree152f6bc272851166a5b1f8edc97cd48e69a8dc01 /erts
parent957f619382923be72835500f56e75d8bbe553892 (diff)
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erts: Add save/restore for PSTACK
Diffstat (limited to 'erts')
-rw-r--r--erts/emulator/beam/global.h42
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 */