CodeChunk *full;
};
+#define ALIGN_INT(val,alignment) (((val) + (alignment - 1)) & ~(alignment - 1))
+
+/**
+ * mono_code_manager_new:
+ *
+ * Creates a new code manager. A code manager can be used to allocate memory
+ * suitable for storing native code that can be later executed.
+ * A code manager allocates memory from the operating system in large chunks
+ * (typically 64KB in size) so that many methods can be allocated inside them
+ * close together, improving cache locality.
+ *
+ * Returns: the new code manager
+ */
MonoCodeManager*
mono_code_manager_new (void)
{
return cman;
}
+/**
+ * mono_code_manager_new_dynamic:
+ *
+ * Creates a new code manager suitable for holding native code that can be
+ * used for single or small methods that need to be deallocated independently
+ * of other native code.
+ *
+ * Returns: the new code manager
+ */
MonoCodeManager*
mono_code_manager_new_dynamic (void)
{
chunk = chunk->next;
if (dead->flags == CODE_FLAG_MMAP) {
mono_vfree (dead->data, dead->size);
- valgrind_unregister(dead->data);
+ /* valgrind_unregister(dead->data); */
} else if (dead->flags == CODE_FLAG_MALLOC) {
free (dead->data);
}
}
}
+/**
+ * mono_code_manager_destroy:
+ * @cman: a code manager
+ *
+ * Free all the memory associated with the code manager @cman.
+ */
void
mono_code_manager_destroy (MonoCodeManager *cman)
{
free (cman);
}
-/* fill all the memory with the 0x2a (42) value */
+/**
+ * mono_code_manager_invalidate:
+ * @cman: a code manager
+ *
+ * Fill all the memory with an invalid native code value
+ * so that any attempt to execute code allocated in the code
+ * manager @cman will fail. This is used for debugging purposes.
+ */
void
mono_code_manager_invalidate (MonoCodeManager *cman)
{
memset (chunk->data, fill_value, chunk->size);
}
+/**
+ * mono_code_manager_foreach:
+ * @cman: a code manager
+ * @func: a callback function pointer
+ * @user_data: additional data to pass to @func
+ *
+ * Invokes the callback @func for each different chunk of memory allocated
+ * in the code manager @cman.
+ */
void
mono_code_manager_foreach (MonoCodeManager *cman, MonoCodeManagerFunc func, void *user_data)
{
/* does it make sense to use the mmap-like API? */
if (flags == CODE_FLAG_MALLOC) {
- ptr = malloc (chunk_size);
+ ptr = malloc (chunk_size + MIN_ALIGN - 1);
if (!ptr)
return NULL;
} else {
return chunk;
}
+/**
+ * mono_code_manager_reserve:
+ * @cman: a code manager
+ * @size: size of memory to allocate
+ * @alignment: power of two alignment value
+ *
+ * Allocates at least @size bytes of memory inside the code manager @cman.
+ *
+ * Returns: the pointer to the allocated memory or #NULL on failure
+ */
void*
-mono_code_manager_reserve (MonoCodeManager *cman, int size)
+mono_code_manager_reserve_align (MonoCodeManager *cman, int size, int alignment)
{
CodeChunk *chunk, *prev;
void *ptr;
-
- size += MIN_ALIGN;
- size &= ~ (MIN_ALIGN - 1);
+
+ /* eventually allow bigger alignments, but we need to fix the dynamic alloc code to
+ * handle this before
+ */
+ g_assert (alignment <= MIN_ALIGN);
if (cman->dynamic) {
++mono_stats.dynamic_code_alloc_count;
}
for (chunk = cman->current; chunk; chunk = chunk->next) {
- if (chunk->pos + size <= chunk->size) {
+ if (ALIGN_INT (chunk->pos, alignment) + size <= chunk->size) {
+ chunk->pos = ALIGN_INT (chunk->pos, alignment);
ptr = chunk->data + chunk->pos;
chunk->pos += size;
return ptr;
return NULL;
chunk->next = cman->current;
cman->current = chunk;
+ chunk->pos = ALIGN_INT (chunk->pos, alignment);
ptr = chunk->data + chunk->pos;
chunk->pos += size;
return ptr;
}
-/*
- * if we reserved too much room for a method and we didn't allocate
- * already from the code manager, we can get back the excess allocation.
+/**
+ * mono_code_manager_reserve:
+ * @cman: a code manager
+ * @size: size of memory to allocate
+ *
+ * Allocates at least @size bytes of memory inside the code manager @cman.
+ *
+ * Returns: the pointer to the allocated memory or #NULL on failure
+ */
+void*
+mono_code_manager_reserve (MonoCodeManager *cman, int size)
+{
+ return mono_code_manager_reserve_align (cman, size, MIN_ALIGN);
+}
+
+/**
+ * mono_code_manager_commit:
+ * @cman: a code manager
+ * @data: the pointer returned by mono_code_manager_reserve ()
+ * @size: the size requested in the call to mono_code_manager_reserve ()
+ * @newsize: the new size to reserve
+ *
+ * If we reserved too much room for a method and we didn't allocate
+ * already from the code manager, we can get back the excess allocation
+ * for later use in the code manager.
*/
void
mono_code_manager_commit (MonoCodeManager *cman, void *data, int size, int newsize)
{
- newsize += MIN_ALIGN;
- newsize &= ~ (MIN_ALIGN - 1);
- size += MIN_ALIGN;
- size &= ~ (MIN_ALIGN - 1);
+ g_assert (newsize <= size);
if (cman->current && (size != newsize) && (data == cman->current->data + cman->current->pos - size)) {
cman->current->pos -= size - newsize;
}
}
+/**
+ * mono_code_manager_size:
+ * @cman: a code manager
+ * @used_size: pointer to an integer for the result
+ *
+ * This function can be used to get statistics about a code manager:
+ * the integer pointed to by @used_size will contain how much
+ * memory is actually used inside the code managed @cman.
+ *
+ * Returns: the amount of memory allocated in @cman
+ */
+int
+mono_code_manager_size (MonoCodeManager *cman, int *used_size)
+{
+ CodeChunk *chunk;
+ guint32 size = 0;
+ guint32 used = 0;
+ for (chunk = cman->current; chunk; chunk = chunk->next) {
+ size += chunk->size;
+ used += chunk->pos;
+ }
+ for (chunk = cman->full; chunk; chunk = chunk->next) {
+ size += chunk->size;
+ used += chunk->pos;
+ }
+ if (used_size)
+ *used_size = used;
+ return size;
+}
+
projects / mono.git / blobdiff