- Commit static allocator structure which we might use in an upcoming Zend

- change

1 files changed, 58 insertions, 0 deletions

diff --git a/Zend/zend_static_allocator.c b/Zend/zend_static_allocator.c
new file mode 100644
index 0000000000..af89a8c7bc
--- /dev/null
+++ b/Zend/zend_static_allocator.c
@@ -0,0 +1,58 @@
+#include <stdlib.h>
+
+#include "zend_static_allocator.h"
+
+/* Not checking emalloc() and erealloc() return values as they are supposed to bailout */
+
+inline static void block_init(Block *block, zend_uint block_size)
+{
+	block->pos = block->bp = (char *) emalloc(block_size);
+	block->end = block->bp + block_size;
+}
+
+inline static char *block_allocate(Block *block, zend_uint size)
+{
+	char *retval = block->pos;
+	if ((block->pos += size) >= block->end) {
+		return (char *)NULL;
+	}
+	return retval;
+}
+
+inline static void block_destroy(Block *block)
+{
+	efree(block->bp);
+}
+
+int static_allocator_init(StaticAllocator *sa)
+{
+	sa->Blocks = (Block *) emalloc(sizeof(Block));
+	block_init(sa->Blocks, ALLOCATOR_BLOCK_SIZE);
+	sa->num_blocks = 1;
+	sa->current_block = 0;
+}
+
+char *static_allocator_allocate(StaticAllocator *sa, zend_uint size)
+{
+	char *retval;
+
+	retval = block_allocate(&sa->Blocks[sa->current_block], size);
+	if (retval) {
+		return retval;
+	}
+	sa->Blocks = (Block *) erealloc(sa->Blocks, ++sa->num_blocks);
+	sa->current_block++;
+	block_init(&sa->Blocks[sa->current_block], (size > ALLOCATOR_BLOCK_SIZE) ? size : ALLOCATOR_BLOCK_SIZE);
+	retval = block_allocate(&sa->Blocks[sa->current_block], size);
+	return retval;
+}
+
+void static_allocator_destroy(StaticAllocator *sa)
+{
+	zend_uint i;
+
+	for (i=0; i<sa->num_blocks; i++) {
+		block_free(&sa->Blocks[i]);
+	}
+	efree(sa->Blocks);
+}