#include "config.h"
+
+#ifdef HAVE_UNISTD_H
#include <unistd.h>
+#endif
#include <stdlib.h>
#include <string.h>
#include <assert.h>
+#include <glib.h>
-#ifdef PLATFORM_WIN32
-#include <windows.h>
-#include <io.h>
-#else
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
-#include <fcntl.h>
-#endif
+/* For dlmalloc.h */
+#define USE_DL_PREFIX 1
#include "mono-codeman.h"
-
-#ifdef PLATFORM_WIN32
-#define FORCE_MALLOC
+#include "mono-mmap.h"
+#include "dlmalloc.h"
+#include <mono/metadata/class-internals.h>
+#include <mono/metadata/profiler-private.h>
+#ifdef HAVE_VALGRIND_MEMCHECK_H
+#include <valgrind/memcheck.h>
#endif
+
+/*
+ * AMD64 processors maintain icache coherency only for pages which are
+ * marked executable. Also, windows DEP requires us to obtain executable memory from
+ * malloc when using dynamic code managers. The system malloc can't do this so we use a
+ * slighly modified version of Doug Lea's Malloc package for this purpose:
+ * http://g.oswego.edu/dl/html/malloc.html
+ */
#define MIN_PAGES 16
-#ifdef __ia64__
+#if defined(__ia64__) || defined(__x86_64__)
+/*
+ * We require 16 byte alignment on amd64 so the fp literals embedded in the code are
+ * properly aligned for SSE2.
+ */
#define MIN_ALIGN 16
#else
#define MIN_ALIGN 8
#endif
+#ifdef __native_client_codegen__
+/* For Google Native Client, all targets of indirect control flow need to */
+/* be aligned to a 32-byte boundary. MIN_ALIGN was updated to 32 to force */
+/* alignment for calls from tramp-x86.c to mono_global_codeman_reserve() */
+/* and mono_domain_code_reserve(). */
+#undef MIN_ALIGN
+#define MIN_ALIGN 32
+#endif
/* if a chunk has less than this amount of free space it's considered full */
#define MAX_WASTAGE 32
#define MIN_BSIZE 32
-#ifndef MAP_ANONYMOUS
-#ifdef MAP_ANON
-#define MAP_ANONYMOUS MAP_ANON
-#else
-#define FORCE_MALLOC
-#endif
-#endif
-
#ifdef __x86_64__
-#define ARCH_MAP_FLAGS MAP_32BIT
+#define ARCH_MAP_FLAGS MONO_MMAP_32BIT
#else
#define ARCH_MAP_FLAGS 0
#endif
+#define MONO_PROT_RWX (MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_EXEC)
+
typedef struct _CodeChunck CodeChunk;
enum {
struct _MonoCodeManager {
int dynamic;
+ int read_only;
CodeChunk *current;
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)
{
cman->current = NULL;
cman->full = NULL;
cman->dynamic = 0;
+ cman->read_only = 0;
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)
{
free_chunklist (CodeChunk *chunk)
{
CodeChunk *dead;
+
+#if defined(HAVE_VALGRIND_MEMCHECK_H) && defined (VALGRIND_JIT_UNREGISTER_MAP)
+ int valgrind_unregister = 0;
+ if (RUNNING_ON_VALGRIND)
+ valgrind_unregister = 1;
+#define valgrind_unregister(x) do { if (valgrind_unregister) { VALGRIND_JIT_UNREGISTER_MAP(NULL,x); } } while (0)
+#else
+#define valgrind_unregister(x)
+#endif
+
for (; chunk; ) {
dead = chunk;
+ mono_profiler_code_chunk_destroy ((gpointer) dead->data);
chunk = chunk->next;
if (dead->flags == CODE_FLAG_MMAP) {
-#ifndef FORCE_MALLOC
- munmap (dead->data, dead->size);
-#endif
+ mono_vfree (dead->data, dead->size);
+ /* valgrind_unregister(dead->data); */
} else if (dead->flags == CODE_FLAG_MALLOC) {
- free (dead->data);
+ dlfree (dead->data);
}
free (dead);
}
}
+/**
+ * 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_set_read_only:
+ * @cman: a code manager
+ *
+ * Make the code manager read only, so further allocation requests cause an assert.
+ */
+void
+mono_code_manager_set_read_only (MonoCodeManager *cman)
+{
+ cman->read_only = TRUE;
+}
+
+/**
+ * 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)
{
}
}
-static int
-query_pagesize (void)
-{
-#ifdef PLATFORM_WIN32
- SYSTEM_INFO info;
- GetSystemInfo (&info);
- return info.dwAllocationGranularity;
-#else
- return getpagesize ();
-#endif
-}
-
/* BIND_ROOM is the divisor for the chunck of code size dedicated
* to binding branches (branches not reachable with the immediate displacement)
* bind_size = size/BIND_ROOM;
static CodeChunk*
new_codechunk (int dynamic, int size)
{
- static int pagesize = 0;
int minsize, flags = CODE_FLAG_MMAP;
int chunk_size, bsize = 0;
+ int pagesize;
CodeChunk *chunk;
void *ptr;
flags = CODE_FLAG_MALLOC;
#endif
- if (!pagesize)
- pagesize = query_pagesize ();
+ pagesize = mono_pagesize ();
if (dynamic) {
chunk_size = size;
flags = CODE_FLAG_MALLOC;
- }
- else {
+ } else {
minsize = pagesize * MIN_PAGES;
if (size < minsize)
chunk_size = minsize;
}
#endif
- /* does it make sense to use the mmap-like API? */
if (flags == CODE_FLAG_MALLOC) {
- ptr = malloc (chunk_size);
+ ptr = dlmemalign (MIN_ALIGN, chunk_size + MIN_ALIGN - 1);
+ if (!ptr)
+ return NULL;
+ } else {
+ ptr = mono_valloc (NULL, chunk_size, MONO_PROT_RWX | ARCH_MAP_FLAGS);
if (!ptr)
return NULL;
-
- }
- else {
-#ifndef FORCE_MALLOC
- ptr = mmap (0, chunk_size, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS|ARCH_MAP_FLAGS, -1, 0);
- if (ptr == (void*)-1) {
- int fd = open ("/dev/zero", O_RDONLY);
- if (fd != -1) {
- ptr = mmap (0, chunk_size, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|ARCH_MAP_FLAGS, fd, 0);
- close (fd);
- }
- if (ptr == (void*)-1) {
- ptr = malloc (chunk_size);
- if (!ptr)
- return NULL;
- flags = CODE_FLAG_MALLOC;
- }
- }
-#else
- return NULL;
-#endif
}
if (flags == CODE_FLAG_MALLOC) {
- /*
- * AMD64 processors maintain icache coherency only for pages which are
- * marked executable.
- */
-#ifndef PLATFORM_WIN32
- {
- char *page_start = (char *) (((unsigned long long) (ptr)) & ~ (pagesize - 1));
- int pages = ((char*)ptr + chunk_size - page_start + pagesize - 1) / pagesize;
- int err = mprotect (page_start, pages * pagesize, PROT_READ | PROT_WRITE | PROT_EXEC);
- assert (!err);
- }
-#else
- {
- DWORD oldp;
- int err = VirtualProtect (ptr, chunk_size, PAGE_EXECUTE_READWRITE, &oldp);
- assert (err);
- }
+#ifdef BIND_ROOM
+ /* Make sure the thunks area is zeroed */
+ memset (ptr, 0, bsize);
#endif
-
- /* Make sure the thunks area is zeroed */
- memset (ptr, 0, bsize);
}
chunk = malloc (sizeof (CodeChunk));
if (!chunk) {
if (flags == CODE_FLAG_MALLOC)
- free (ptr);
-#ifndef FORCE_MALLOC
+ dlfree (ptr);
else
- munmap (ptr, chunk_size);
-#endif
+ mono_vfree (ptr, chunk_size);
return NULL;
}
chunk->next = NULL;
chunk->flags = flags;
chunk->pos = bsize;
chunk->bsize = bsize;
+ mono_profiler_code_chunk_new((gpointer) chunk->data, chunk->size);
/*printf ("code chunk at: %p\n", ptr);*/
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);
+
+ g_assert (!cman->read_only);
+
+ /* 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;
+ mono_stats.dynamic_code_bytes_count += size;
+ }
if (!cman->current) {
cman->current = new_codechunk (cman->dynamic, size);
}
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