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fix allocation to ensure that top is properly aligned from the beginning

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krangelov
2021-08-12 10:40:33 +02:00
parent d2aec60612
commit 82ce76a2ce
2 changed files with 10 additions and 8 deletions
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8
src/runtime/c/pgf/db.h
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@@ -1,6 +1,8 @@
#ifndef DB_H
#define DB_H
#define MALLOC_ALIGN_MASK (2*sizeof(size_t) - 1)
class DB;
extern PGF_INTERNAL_DECL __thread unsigned char* current_base __attribute__((tls_model("initial-exec")));
@@ -39,18 +41,18 @@ public:
static
variant tagged(ref<A> ref) {
assert(A::tag < 2*sizeof(size_t));
assert(A::tag < MALLOC_ALIGN_MASK + 1);
return (ref.offset | A::tag);
}
static
ref<A> untagged(variant v) {
return (v & ~(2*sizeof(size_t) - 1));
return (v & ~MALLOC_ALIGN_MASK);
}
static
uint8_t get_tag(variant v) {
return (v & (2*sizeof(size_t) - 1));
return (v & MALLOC_ALIGN_MASK);
}
};