#ifndef DISABLE_JIT
+#include <mono/metadata/gc-internals.h>
#include <mono/utils/mono-memory-model.h>
#include "mini.h"
#include "ir-emit.h"
+#include "jit-icalls.h"
#define MAX_INLINE_COPIES 10
+#define MAX_INLINE_COPY_SIZE 10000
void
mini_emit_memset (MonoCompile *cfg, int destreg, int offset, int size, int val, int align)
{
int val_reg;
+ /*FIXME arbitrary hack to avoid unbound code expansion.*/
+ g_assert (size < MAX_INLINE_COPY_SIZE);
g_assert (val == 0);
-
- if (align == 0)
- align = 4;
+ g_assert (align > 0);
if ((size <= SIZEOF_REGISTER) && (size <= align)) {
switch (size) {
else
MONO_EMIT_NEW_ICONST (cfg, val_reg, val);
- if (align < 4) {
- /* This could be optimized further if neccesary */
- while (size >= 1) {
- MONO_EMIT_NEW_STORE_MEMBASE (cfg, OP_STOREI1_MEMBASE_REG, destreg, offset, val_reg);
- offset += 1;
- size -= 1;
- }
- return;
- }
-
- if (!cfg->backend->no_unaligned_access && SIZEOF_REGISTER == 8) {
- if (offset % 8) {
- MONO_EMIT_NEW_STORE_MEMBASE (cfg, OP_STOREI4_MEMBASE_REG, destreg, offset, val_reg);
- offset += 4;
- size -= 4;
- }
+ if (align < SIZEOF_VOID_P) {
+ if (align % 2 == 1)
+ goto set_1;
+ if (align % 4 == 2)
+ goto set_2;
+ if (SIZEOF_VOID_P == 8 && align % 8 == 4)
+ goto set_4;
+ }
+
+ //Unaligned offsets don't naturaly happen in the runtime, so it's ok to be conservative in how we copy
+ //We assume that input src and dest are be aligned to `align` so offset just worsen it
+ int offsets_mask = offset & 0x7; //we only care about the misalignment part
+ if (offsets_mask) {
+ if (offsets_mask % 2 == 1)
+ goto set_1;
+ if (offsets_mask % 4 == 2)
+ goto set_2;
+ if (SIZEOF_VOID_P == 8 && offsets_mask % 8 == 4)
+ goto set_4;
+ }
+
+ if (SIZEOF_REGISTER == 8) {
while (size >= 8) {
MONO_EMIT_NEW_STORE_MEMBASE (cfg, OP_STOREI8_MEMBASE_REG, destreg, offset, val_reg);
offset += 8;
size -= 8;
}
- }
+ }
+set_4:
while (size >= 4) {
MONO_EMIT_NEW_STORE_MEMBASE (cfg, OP_STOREI4_MEMBASE_REG, destreg, offset, val_reg);
offset += 4;
size -= 4;
}
+
+
+set_2:
while (size >= 2) {
MONO_EMIT_NEW_STORE_MEMBASE (cfg, OP_STOREI2_MEMBASE_REG, destreg, offset, val_reg);
offset += 2;
size -= 2;
}
+
+set_1:
while (size >= 1) {
MONO_EMIT_NEW_STORE_MEMBASE (cfg, OP_STOREI1_MEMBASE_REG, destreg, offset, val_reg);
offset += 1;
{
int cur_reg;
- if (align == 0)
- align = 4;
-
/*FIXME arbitrary hack to avoid unbound code expansion.*/
- g_assert (size < 10000);
+ g_assert (size < MAX_INLINE_COPY_SIZE);
+ g_assert (align > 0);
+
+ if (align < SIZEOF_VOID_P) {
+ if (align == 4)
+ goto copy_4;
+ if (align == 2)
+ goto copy_2;
+ goto copy_1;
+ }
- if (align < 4) {
- /* This could be optimized further if neccesary */
- while (size >= 1) {
- cur_reg = alloc_preg (cfg);
- MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADI1_MEMBASE, cur_reg, srcreg, soffset);
- MONO_EMIT_NEW_STORE_MEMBASE (cfg, OP_STOREI1_MEMBASE_REG, destreg, doffset, cur_reg);
- doffset += 1;
- soffset += 1;
- size -= 1;
- }
+ //Unaligned offsets don't naturaly happen in the runtime, so it's ok to be conservative in how we copy
+ //We assume that input src and dest are be aligned to `align` so offset just worsen it
+ int offsets_mask = (doffset | soffset) & 0x7; //we only care about the misalignment part
+ if (offsets_mask) {
+ if (offsets_mask % 2 == 1)
+ goto copy_1;
+ if (offsets_mask % 4 == 2)
+ goto copy_2;
+ if (SIZEOF_VOID_P == 8 && offsets_mask % 8 == 4)
+ goto copy_4;
}
- if (!cfg->backend->no_unaligned_access && SIZEOF_REGISTER == 8) {
+
+ if (SIZEOF_REGISTER == 8) {
while (size >= 8) {
cur_reg = alloc_preg (cfg);
MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADI8_MEMBASE, cur_reg, srcreg, soffset);
soffset += 8;
size -= 8;
}
- }
+ }
+copy_4:
while (size >= 4) {
cur_reg = alloc_preg (cfg);
MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADI4_MEMBASE, cur_reg, srcreg, soffset);
soffset += 4;
size -= 4;
}
+
+copy_2:
while (size >= 2) {
cur_reg = alloc_preg (cfg);
MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADI2_MEMBASE, cur_reg, srcreg, soffset);
soffset += 2;
size -= 2;
}
+
+copy_1:
while (size >= 1) {
cur_reg = alloc_preg (cfg);
MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADI1_MEMBASE, cur_reg, srcreg, soffset);
/* FIXME: Optimize the case when src/dest is OP_LDADDR */
/* We can't do copies at a smaller granule than the provided alignment */
- if (size_ins || ((size / align > MAX_INLINE_COPIES) && !(cfg->opt & MONO_OPT_INTRINS))) {
+ if (size_ins || (size / align > MAX_INLINE_COPIES) || !(cfg->opt & MONO_OPT_INTRINS)) {
MonoInst *iargs [3];
iargs [0] = dest;
iargs [1] = src;
/* FIXME: Optimize the case when dest is OP_LDADDR */
/* We can't do copies at a smaller granule than the provided alignment */
- if (value_ins || size_ins || value != 0 || ((size / align > MAX_INLINE_COPIES) && !(cfg->opt & MONO_OPT_INTRINS))) {
+ if (value_ins || size_ins || value != 0 || (size / align > MAX_INLINE_COPIES) || !(cfg->opt & MONO_OPT_INTRINS)) {
MonoInst *iargs [3];
iargs [0] = dest;
mini_emit_memset_internal (cfg, dest, NULL, value, NULL, size, align);
}
+
+static void
+create_write_barrier_bitmap (MonoCompile *cfg, MonoClass *klass, unsigned *wb_bitmap, int offset)
+{
+ MonoClassField *field;
+ gpointer iter = NULL;
+
+ while ((field = mono_class_get_fields (klass, &iter))) {
+ int foffset;
+
+ if (field->type->attrs & FIELD_ATTRIBUTE_STATIC)
+ continue;
+ foffset = klass->valuetype ? field->offset - sizeof (MonoObject): field->offset;
+ if (mini_type_is_reference (mono_field_get_type (field))) {
+ g_assert ((foffset % SIZEOF_VOID_P) == 0);
+ *wb_bitmap |= 1 << ((offset + foffset) / SIZEOF_VOID_P);
+ } else {
+ MonoClass *field_class = mono_class_from_mono_type (field->type);
+ if (field_class->has_references)
+ create_write_barrier_bitmap (cfg, field_class, wb_bitmap, offset + foffset);
+ }
+ }
+}
+
+static gboolean
+mini_emit_wb_aware_memcpy (MonoCompile *cfg, MonoClass *klass, MonoInst *iargs[4], int size, int align)
+{
+ int dest_ptr_reg, tmp_reg, destreg, srcreg, offset;
+ unsigned need_wb = 0;
+
+ if (align == 0)
+ align = 4;
+
+ /*types with references can't have alignment smaller than sizeof(void*) */
+ if (align < SIZEOF_VOID_P)
+ return FALSE;
+
+ if (size > 5 * SIZEOF_VOID_P)
+ return FALSE;
+
+ create_write_barrier_bitmap (cfg, klass, &need_wb, 0);
+
+ destreg = iargs [0]->dreg;
+ srcreg = iargs [1]->dreg;
+ offset = 0;
+
+ dest_ptr_reg = alloc_preg (cfg);
+ tmp_reg = alloc_preg (cfg);
+
+ /*tmp = dreg*/
+ EMIT_NEW_UNALU (cfg, iargs [0], OP_MOVE, dest_ptr_reg, destreg);
+
+ while (size >= SIZEOF_VOID_P) {
+ MonoInst *load_inst;
+ MONO_INST_NEW (cfg, load_inst, OP_LOAD_MEMBASE);
+ load_inst->dreg = tmp_reg;
+ load_inst->inst_basereg = srcreg;
+ load_inst->inst_offset = offset;
+ MONO_ADD_INS (cfg->cbb, load_inst);
+
+ MONO_EMIT_NEW_STORE_MEMBASE (cfg, OP_STOREP_MEMBASE_REG, dest_ptr_reg, 0, tmp_reg);
+
+ if (need_wb & 0x1)
+ mini_emit_write_barrier (cfg, iargs [0], load_inst);
+
+ offset += SIZEOF_VOID_P;
+ size -= SIZEOF_VOID_P;
+ need_wb >>= 1;
+
+ /*tmp += sizeof (void*)*/
+ if (size >= SIZEOF_VOID_P) {
+ NEW_BIALU_IMM (cfg, iargs [0], OP_PADD_IMM, dest_ptr_reg, dest_ptr_reg, SIZEOF_VOID_P);
+ MONO_ADD_INS (cfg->cbb, iargs [0]);
+ }
+ }
+
+ /* Those cannot be references since size < sizeof (void*) */
+ while (size >= 4) {
+ MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADI4_MEMBASE, tmp_reg, srcreg, offset);
+ MONO_EMIT_NEW_STORE_MEMBASE (cfg, OP_STOREI4_MEMBASE_REG, destreg, offset, tmp_reg);
+ offset += 4;
+ size -= 4;
+ }
+
+ while (size >= 2) {
+ MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADI2_MEMBASE, tmp_reg, srcreg, offset);
+ MONO_EMIT_NEW_STORE_MEMBASE (cfg, OP_STOREI2_MEMBASE_REG, destreg, offset, tmp_reg);
+ offset += 2;
+ size -= 2;
+ }
+
+ while (size >= 1) {
+ MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADI1_MEMBASE, tmp_reg, srcreg, offset);
+ MONO_EMIT_NEW_STORE_MEMBASE (cfg, OP_STOREI1_MEMBASE_REG, destreg, offset, tmp_reg);
+ offset += 1;
+ size -= 1;
+ }
+
+ return TRUE;
+}
+
+static void
+mini_emit_memory_copy_internal (MonoCompile *cfg, MonoInst *dest, MonoInst *src, MonoClass *klass, int explicit_align, gboolean native)
+{
+ MonoInst *iargs [4];
+ int size;
+ guint32 align = 0;
+ MonoInst *size_ins = NULL;
+ MonoInst *memcpy_ins = NULL;
+
+ g_assert (klass);
+ /*
+ Fun fact about @native. It's false that @klass will have no ref when @native is true.
+ This happens in pinvoke2. What goes is that marshal.c uses CEE_MONO_LDOBJNATIVE and pass klass.
+ The actual stuff being copied will have no refs, but @klass might.
+ This means we can't assert !(klass->has_references && native).
+ */
+
+ if (cfg->gshared)
+ klass = mono_class_from_mono_type (mini_get_underlying_type (&klass->byval_arg));
+
+ /*
+ * This check breaks with spilled vars... need to handle it during verification anyway.
+ * g_assert (klass && klass == src->klass && klass == dest->klass);
+ */
+
+ if (mini_is_gsharedvt_klass (klass)) {
+ g_assert (!native);
+ size_ins = mini_emit_get_gsharedvt_info_klass (cfg, klass, MONO_RGCTX_INFO_VALUE_SIZE);
+ memcpy_ins = mini_emit_get_gsharedvt_info_klass (cfg, klass, MONO_RGCTX_INFO_MEMCPY);
+ }
+
+ if (native)
+ size = mono_class_native_size (klass, &align);
+ else
+ size = mono_class_value_size (klass, &align);
+
+ if (!align)
+ align = SIZEOF_VOID_P;
+ if (explicit_align)
+ align = explicit_align;
+
+ if (mini_type_is_reference (&klass->byval_arg)) { // Refs *MUST* be naturally aligned
+ MonoInst *store, *load;
+ int dreg = alloc_ireg_ref (cfg);
+
+ NEW_LOAD_MEMBASE (cfg, load, OP_LOAD_MEMBASE, dreg, src->dreg, 0);
+ MONO_ADD_INS (cfg->cbb, load);
+
+ NEW_STORE_MEMBASE (cfg, store, OP_STORE_MEMBASE_REG, dest->dreg, 0, dreg);
+ MONO_ADD_INS (cfg->cbb, store);
+
+ mini_emit_write_barrier (cfg, dest, src);
+ } else if (cfg->gen_write_barriers && (klass->has_references || size_ins) && !native) { /* if native is true there should be no references in the struct */
+ /* Avoid barriers when storing to the stack */
+ if (!((dest->opcode == OP_ADD_IMM && dest->sreg1 == cfg->frame_reg) ||
+ (dest->opcode == OP_LDADDR))) {
+ int context_used;
+
+ iargs [0] = dest;
+ iargs [1] = src;
+
+ context_used = mini_class_check_context_used (cfg, klass);
+
+ /* It's ok to intrinsify under gsharing since shared code types are layout stable. */
+ if (!size_ins && (cfg->opt & MONO_OPT_INTRINS) && mini_emit_wb_aware_memcpy (cfg, klass, iargs, size, align)) {
+ } else if (size_ins || align < SIZEOF_VOID_P) {
+ if (context_used) {
+ iargs [2] = mini_emit_get_rgctx_klass (cfg, context_used, klass, MONO_RGCTX_INFO_KLASS);
+ } else {
+ iargs [2] = mini_emit_runtime_constant (cfg, MONO_PATCH_INFO_CLASS, klass);
+ if (!cfg->compile_aot)
+ mono_class_compute_gc_descriptor (klass);
+ }
+ if (size_ins)
+ mono_emit_jit_icall (cfg, mono_gsharedvt_value_copy, iargs);
+ else
+ mono_emit_jit_icall (cfg, mono_value_copy, iargs);
+ } else {
+ /* We don't unroll more than 5 stores to avoid code bloat. */
+ /*This is harmless and simplify mono_gc_get_range_copy_func */
+ size += (SIZEOF_VOID_P - 1);
+ size &= ~(SIZEOF_VOID_P - 1);
+
+ EMIT_NEW_ICONST (cfg, iargs [2], size);
+ mono_emit_jit_icall (cfg, mono_gc_get_range_copy_func (), iargs);
+ }
+ return;
+ }
+ }
+
+ if (size_ins) {
+ iargs [0] = dest;
+ iargs [1] = src;
+ iargs [2] = size_ins;
+ mini_emit_calli (cfg, mono_method_signature (mini_get_memcpy_method ()), iargs, memcpy_ins, NULL, NULL);
+ } else {
+ mini_emit_memcpy_const_size (cfg, dest, src, size, align);
+ }
+}
+
MonoInst*
mini_emit_memory_load (MonoCompile *cfg, MonoType *type, MonoInst *src, int offset, int ins_flag)
{
MonoInst *ins;
- EMIT_NEW_LOAD_MEMBASE_TYPE (cfg, ins, type, src->dreg, offset);
+ if (ins_flag & MONO_INST_UNALIGNED) {
+ MonoInst *addr, *tmp_var;
+ int align;
+ int size = mono_type_size (type, &align);
+
+ if (offset) {
+ MonoInst *add_offset;
+ NEW_BIALU_IMM (cfg, add_offset, OP_PADD_IMM, alloc_preg (cfg), src->dreg, offset);
+ MONO_ADD_INS (cfg->cbb, add_offset);
+ src = add_offset;
+ }
+
+ tmp_var = mono_compile_create_var (cfg, type, OP_LOCAL);
+ EMIT_NEW_VARLOADA (cfg, addr, tmp_var, tmp_var->inst_vtype);
+
+ mini_emit_memcpy_const_size (cfg, addr, src, size, 1);
+ EMIT_NEW_TEMPLOAD (cfg, ins, tmp_var->inst_c0);
+ } else {
+ EMIT_NEW_LOAD_MEMBASE_TYPE (cfg, ins, type, src->dreg, offset);
+ }
ins->flags |= ins_flag;
if (ins_flag & MONO_INST_VOLATILE) {
/* Volatile stores have release semantics, see 12.6.7 in Ecma 335 */
mini_emit_memory_barrier (cfg, MONO_MEMORY_BARRIER_REL);
}
+
+ if (ins_flag & MONO_INST_UNALIGNED) {
+ MonoInst *addr, *mov, *tmp_var;
+
+ tmp_var = mono_compile_create_var (cfg, type, OP_LOCAL);
+ EMIT_NEW_TEMPSTORE (cfg, mov, tmp_var->inst_c0, value);
+ EMIT_NEW_VARLOADA (cfg, addr, tmp_var, tmp_var->inst_vtype);
+ mini_emit_memory_copy_internal (cfg, dest, addr, mono_class_from_mono_type (type), 1, FALSE);
+ }
+
/* FIXME: should check item at sp [1] is compatible with the type of the store. */
EMIT_NEW_STORE_MEMBASE_TYPE (cfg, ins, type, dest->dreg, 0, value->dreg);
void
mini_emit_memory_copy_bytes (MonoCompile *cfg, MonoInst *dest, MonoInst *src, MonoInst *size, int ins_flag)
{
- int align = SIZEOF_VOID_P;
+ int align = (ins_flag & MONO_INST_UNALIGNED) ? 1 : SIZEOF_VOID_P;
/*
* FIXME: It's unclear whether we should be emitting both the acquire
if ((cfg->opt & MONO_OPT_INTRINS) && (size->opcode == OP_ICONST)) {
mini_emit_memcpy_const_size (cfg, dest, src, size->inst_c0, align);
} else {
- if (cfg->verbose_level > 3)
- printf ("EMITING REGULAR COPY\n");
mini_emit_memcpy_internal (cfg, dest, src, size, 0, align);
}
void
mini_emit_memory_init_bytes (MonoCompile *cfg, MonoInst *dest, MonoInst *value, MonoInst *size, int ins_flag)
{
- int align = SIZEOF_VOID_P;
+ int align = (ins_flag & MONO_INST_UNALIGNED) ? 1 : SIZEOF_VOID_P;
if (ins_flag & MONO_INST_VOLATILE) {
/* Volatile stores have release semantics, see 12.6.7 in Ecma 335 */
}
+/*
+ * If @klass is a valuetype, emit code to copy a value with source address in @src and destination address in @dest.
+ * If @klass is a ref type, copy a pointer instead.
+ */
+
+void
+mini_emit_memory_copy (MonoCompile *cfg, MonoInst *dest, MonoInst *src, MonoClass *klass, gboolean native, int ins_flag)
+{
+ int explicit_align = 0;
+ if (ins_flag & MONO_INST_UNALIGNED)
+ explicit_align = 1;
+
+ /*
+ * FIXME: It's unclear whether we should be emitting both the acquire
+ * and release barriers for cpblk. It is technically both a load and
+ * store operation, so it seems like that's the sensible thing to do.
+ *
+ * FIXME: We emit full barriers on both sides of the operation for
+ * simplicity. We should have a separate atomic memcpy method instead.
+ */
+ if (ins_flag & MONO_INST_VOLATILE) {
+ /* Volatile loads have acquire semantics, see 12.6.7 in Ecma 335 */
+ mini_emit_memory_barrier (cfg, MONO_MEMORY_BARRIER_SEQ);
+ }
+
+ mini_emit_memory_copy_internal (cfg, dest, src, klass, explicit_align, native);
+
+ if (ins_flag & MONO_INST_VOLATILE) {
+ /* Volatile loads have acquire semantics, see 12.6.7 in Ecma 335 */
+ mini_emit_memory_barrier (cfg, MONO_MEMORY_BARRIER_SEQ);
+ }
+}
+
#endif
projects / mono.git / blobdiff