mono/mini/mini-arm-gsharedvt.c

   1 /*
   2  * mini-arm-gsharedvt.c: gsharedvt support code for arm
   3  *
   4  * Authors:
   5  *   Zoltan Varga <vargaz@gmail.com>
   6  *
   7  * Copyright 2013 Xamarin, Inc (http://www.xamarin.com)
   8  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
   9  */
  10 #include <config.h>
  11 #include <glib.h>
  12
  13 #include <mono/metadata/abi-details.h>
  14 #include <mono/metadata/appdomain.h>
  15 #include <mono/metadata/marshal.h>
  16 #include <mono/metadata/tabledefs.h>
  17 #include <mono/metadata/profiler-private.h>
  18 #include <mono/arch/arm/arm-codegen.h>
  19 #include <mono/arch/arm/arm-vfp-codegen.h>
  20
  21 #include "mini.h"
  22 #include "mini-arm.h"
  23
  24 #ifdef MONO_ARCH_GSHAREDVT_SUPPORTED
  25
  26 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
  27
  28 /*
  29  * GSHAREDVT
  30  */
  31
  32 gboolean
  33 mono_arch_gsharedvt_sig_supported (MonoMethodSignature *sig)
  34 {
  35         /*
  36         if (sig->ret && is_variable_size (sig->ret))
  37                 return FALSE;
  38         */
  39         return TRUE;
  40 }
  41
  42 static inline void
  43 add_to_map (GPtrArray *map, int src, int dst)
  44 {
  45         g_ptr_array_add (map, GUINT_TO_POINTER (src));
  46         g_ptr_array_add (map, GUINT_TO_POINTER (dst));
  47 }
  48
  49 static inline int
  50 map_reg (int reg)
  51 {
  52         return reg;
  53 }
  54
  55 static inline int
  56 map_stack_slot (int slot)
  57 {
  58         return slot + 4;
  59 }
  60
  61 static int
  62 get_arg_slots (ArgInfo *ainfo, int **out_slots)
  63 {
  64         int sreg = ainfo->reg;
  65         int sslot = ainfo->offset / 4;
  66         int *src = NULL;
  67         int i, nsrc;
  68
  69         switch (ainfo->storage) {
  70         case RegTypeGeneral:
  71                 nsrc = 1;
  72                 src = g_malloc (nsrc * sizeof (int));
  73                 src [0] = map_reg (sreg);
  74                 break;
  75         case RegTypeIRegPair:
  76                 nsrc = 2;
  77                 src = g_malloc (nsrc * sizeof (int));
  78                 src [0] = map_reg (sreg);
  79                 src [1] = map_reg (sreg + 1);
  80                 break;
  81         case RegTypeStructByVal:
  82                 nsrc = ainfo->struct_size / 4;
  83                 src = g_malloc (nsrc * sizeof (int));
  84                 g_assert (ainfo->size <= nsrc);
  85                 for (i = 0; i < ainfo->size; ++i)
  86                         src [i] = map_reg (sreg + i);
  87                 for (i = ainfo->size; i < nsrc; ++i)
  88                         src [i] = map_stack_slot (sslot + (i - ainfo->size));
  89                 break;
  90         case RegTypeBase:
  91                 nsrc = ainfo->size / 4;
  92                 src = g_malloc (nsrc * sizeof (int));
  93                 for (i = 0; i < nsrc; ++i)
  94                         src [i] = map_stack_slot (sslot + i);
  95                 break;
  96         case RegTypeBaseGen:
  97                 nsrc = 2;
  98                 src = g_malloc (nsrc * sizeof (int));
  99                 src [0] = map_reg (ARMREG_R3);
 100                 src [1] = map_stack_slot (sslot);
 101                 break;
 102         default:
 103                 g_assert_not_reached ();
 104                 break;
 105         }
 106
 107         *out_slots = src;
 108         return nsrc;
 109 }
 110
 111 /*
 112  * mono_arch_get_gsharedvt_call_info:
 113  *
 114  *   See mini-x86.c for documentation.
 115  */
 116 gpointer
 117 mono_arch_get_gsharedvt_call_info (gpointer addr, MonoMethodSignature *normal_sig, MonoMethodSignature *gsharedvt_sig, gboolean gsharedvt_in, gint32 vcall_offset, gboolean calli)
 118 {
 119         GSharedVtCallInfo *info;
 120         CallInfo *caller_cinfo, *callee_cinfo;
 121         MonoMethodSignature *caller_sig, *callee_sig;
 122         int aindex, i;
 123         gboolean var_ret = FALSE;
 124         gboolean have_fregs = FALSE;
 125         CallInfo *cinfo, *gcinfo;
 126         MonoMethodSignature *sig, *gsig;
 127         GPtrArray *map;
 128
 129         if (gsharedvt_in) {
 130                 caller_sig = normal_sig;
 131                 callee_sig = gsharedvt_sig;
 132                 caller_cinfo = mono_arch_get_call_info (NULL, caller_sig);
 133                 callee_cinfo = mono_arch_get_call_info (NULL, callee_sig);
 134         } else {
 135                 callee_sig = normal_sig;
 136                 callee_cinfo = mono_arch_get_call_info (NULL, callee_sig);
 137                 caller_sig = gsharedvt_sig;
 138                 caller_cinfo = mono_arch_get_call_info (NULL, caller_sig);
 139         }
 140
 141         /*
 142          * If GSHAREDVT_IN is true, this means we are transitioning from normal to gsharedvt code. The caller uses the
 143          * normal call signature, while the callee uses the gsharedvt signature.
 144          * If GSHAREDVT_IN is false, its the other way around.
 145          */
 146
 147         /* sig/cinfo describes the normal call, while gsig/gcinfo describes the gsharedvt call */
 148         if (gsharedvt_in) {
 149                 sig = caller_sig;
 150                 gsig = callee_sig;
 151                 cinfo = caller_cinfo;
 152                 gcinfo = callee_cinfo;
 153         } else {
 154                 sig = callee_sig;
 155                 gsig = caller_sig;
 156                 cinfo = callee_cinfo;
 157                 gcinfo = caller_cinfo;
 158         }
 159
 160         if (gcinfo->ret.storage == RegTypeStructByAddr && gsig->ret && mini_is_gsharedvt_type (gsig->ret)) {
 161                 /*
 162                  * The return type is gsharedvt
 163                  */
 164                 var_ret = TRUE;
 165         }
 166
 167         /*
 168          * The stack looks like this:
 169          * <arguments>
 170          * <ret addr>
 171          * <saved ebp>
 172          * <call area>
 173          * We have to map the stack slots in <arguments> to the stack slots in <call area>.
 174          * The argument registers are mapped to slot 0..3, stack slot 0 is mapped to slot 4, etc.
 175          */
 176         map = g_ptr_array_new ();
 177
 178         if (cinfo->ret.storage == RegTypeStructByAddr) {
 179                 /*
 180                  * Map ret arg.
 181                  * This handles the case when the method returns a normal vtype, and when it returns a type arg, and its instantiated
 182                  * with a vtype.
 183                  */
 184                 g_assert (caller_cinfo->ret.storage == RegTypeStructByAddr);
 185                 g_assert (callee_cinfo->ret.storage == RegTypeStructByAddr);
 186                 add_to_map (map, map_reg (caller_cinfo->ret.reg), map_reg (callee_cinfo->ret.reg));
 187         }
 188
 189         for (aindex = 0; aindex < cinfo->nargs; ++aindex) {
 190                 ArgInfo *ainfo = &caller_cinfo->args [aindex];
 191                 ArgInfo *ainfo2 = &callee_cinfo->args [aindex];
 192                 int *src = NULL, *dst = NULL;
 193                 int nsrc, ndst, nslots, src_slot, arg_marshal;
 194
 195                 if (ainfo->storage == RegTypeFP || ainfo2->storage == RegTypeFP) {
 196                         have_fregs = TRUE;
 197                         continue;
 198                 }
 199
 200                 /*
 201                  * The src descriptor looks like this:
 202                  * - 4 bits src slot
 203                  * - 12 bits number of slots
 204                  * - 8 bits marshal type (GSHAREDVT_ARG_...)
 205                  */
 206
 207                 arg_marshal = GSHAREDVT_ARG_NONE;
 208
 209                 if (ainfo->storage == RegTypeGSharedVtInReg || ainfo->storage == RegTypeGSharedVtOnStack) {
 210                         /* Pass the value whose address is received in a reg by value */
 211                         g_assert (ainfo2->storage != RegTypeGSharedVtInReg);
 212                         ndst = get_arg_slots (ainfo2, &dst);
 213                         nsrc = 1;
 214                         src = g_new0 (int, 1);
 215                         if (ainfo->storage == RegTypeGSharedVtInReg)
 216                                 src_slot = map_reg (ainfo->reg);
 217                         else
 218                                 src_slot = map_stack_slot (ainfo->offset / 4);
 219                         g_assert (ndst < 256);
 220                         g_assert (src_slot < 16);
 221                         src [0] = (ndst << 4) | src_slot;
 222
 223                         if (ainfo2->storage == RegTypeGeneral && ainfo2->size != 0 && ainfo2->size != 4) {
 224                                 /* Have to load less than 4 bytes */
 225                                 // FIXME: Signed types
 226                                 switch (ainfo2->size) {
 227                                 case 1:
 228                                         arg_marshal = GSHAREDVT_ARG_BYREF_TO_BYVAL_U1;
 229                                         break;
 230                                 case 2:
 231                                         arg_marshal = GSHAREDVT_ARG_BYREF_TO_BYVAL_U2;
 232                                         break;
 233                                 default:
 234                                         g_assert_not_reached ();
 235                                         break;
 236                                 }
 237                         } else {
 238                                 arg_marshal = GSHAREDVT_ARG_BYREF_TO_BYVAL;
 239                         }
 240                 } else {
 241                         nsrc = get_arg_slots (ainfo, &src);
 242                 }
 243                 if (ainfo2->storage == RegTypeGSharedVtInReg) {
 244                         /* Pass the address of the first src slot in a reg */
 245                         arg_marshal = GSHAREDVT_ARG_BYVAL_TO_BYREF;
 246                         ndst = 1;
 247                         dst = g_new0 (int, 1);
 248                         dst [0] = map_reg (ainfo2->reg);
 249                 } else if (ainfo2->storage == RegTypeGSharedVtOnStack) {
 250                         /* Pass the address of the first src slot in a stack slot */
 251                         arg_marshal = GSHAREDVT_ARG_BYVAL_TO_BYREF;
 252                         ndst = 1;
 253                         dst = g_new0 (int, 1);
 254                         dst [0] = map_stack_slot (ainfo2->offset / 4);
 255                 } else {
 256                         ndst = get_arg_slots (ainfo2, &dst);
 257                 }
 258                 if (nsrc)
 259                         src [0] |= (arg_marshal << 16);
 260                 nslots = MIN (nsrc, ndst);
 261
 262                 for (i = 0; i < nslots; ++i)
 263                         add_to_map (map, src [i], dst [i]);
 264
 265                 g_free (src);
 266                 g_free (dst);
 267         }
 268
 269         info = mono_domain_alloc0 (mono_domain_get (), sizeof (GSharedVtCallInfo) + (map->len * sizeof (int)));
 270         info->addr = addr;
 271         info->stack_usage = callee_cinfo->stack_usage;
 272         info->ret_marshal = GSHAREDVT_RET_NONE;
 273         info->gsharedvt_in = gsharedvt_in ? 1 : 0;
 274         info->vret_slot = -1;
 275         info->calli = calli;
 276         if (var_ret) {
 277                 g_assert (gcinfo->ret.storage == RegTypeStructByAddr);
 278                 info->vret_arg_reg = gcinfo->ret.reg;
 279         } else {
 280                 info->vret_arg_reg = -1;
 281         }
 282         info->vcall_offset = vcall_offset;
 283         info->map_count = map->len / 2;
 284         for (i = 0; i < map->len; ++i)
 285                 info->map [i] = GPOINTER_TO_UINT (g_ptr_array_index (map, i));
 286         g_ptr_array_free (map, TRUE);
 287
 288         /* Compute return value marshalling */
 289         if (var_ret) {
 290                 switch (cinfo->ret.storage) {
 291                 case RegTypeGeneral:
 292                         if (gsharedvt_in && !sig->ret->byref && sig->ret->type == MONO_TYPE_I1)
 293                                 info->ret_marshal = GSHAREDVT_RET_I1;
 294                         else if (gsharedvt_in && !sig->ret->byref && (sig->ret->type == MONO_TYPE_U1 || sig->ret->type == MONO_TYPE_BOOLEAN))
 295                                 info->ret_marshal = GSHAREDVT_RET_U1;
 296                         else if (gsharedvt_in && !sig->ret->byref && sig->ret->type == MONO_TYPE_I2)
 297                                 info->ret_marshal = GSHAREDVT_RET_I2;
 298                         else if (gsharedvt_in && !sig->ret->byref && (sig->ret->type == MONO_TYPE_U2 || sig->ret->type == MONO_TYPE_CHAR))
 299                                 info->ret_marshal = GSHAREDVT_RET_U2;
 300                         else
 301                                 info->ret_marshal = GSHAREDVT_RET_IREG;
 302                         break;
 303                 case RegTypeIRegPair:
 304                         info->ret_marshal = GSHAREDVT_RET_IREGS;
 305                         break;
 306                 case RegTypeFP:
 307                         if (mono_arm_is_hard_float ()) {
 308                                 if (cinfo->ret.size == 4)
 309                                         info->ret_marshal = GSHAREDVT_RET_VFP_R4;
 310                                 else
 311                                         info->ret_marshal = GSHAREDVT_RET_VFP_R8;
 312                         } else {
 313                                 if (cinfo->ret.size == 4)
 314                                         info->ret_marshal = GSHAREDVT_RET_IREG;
 315                                 else
 316                                         info->ret_marshal = GSHAREDVT_RET_IREGS;
 317                         }
 318                         break;
 319                 case RegTypeStructByAddr:
 320                         info->ret_marshal = GSHAREDVT_RET_NONE;
 321                         break;
 322                 default:
 323                         g_assert_not_reached ();
 324                 }
 325         }
 326
 327         if (gsharedvt_in && var_ret && caller_cinfo->ret.storage != RegTypeStructByAddr) {
 328                 /* Allocate stack space for the return value */
 329                 info->vret_slot = map_stack_slot (info->stack_usage / sizeof (gpointer));
 330                 info->stack_usage += mono_type_stack_size_internal (normal_sig->ret, NULL, FALSE) + sizeof (gpointer);
 331         }
 332
 333         info->stack_usage = ALIGN_TO (info->stack_usage, MONO_ARCH_FRAME_ALIGNMENT);
 334         info->caller_cinfo = caller_cinfo;
 335         info->callee_cinfo = callee_cinfo;
 336         info->have_fregs = have_fregs;
 337
 338         return info;
 339 }
 340
 341 #endif