1 /*
   2  * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_C1_C1_FRAMEMAP_HPP
  26 #define SHARE_VM_C1_C1_FRAMEMAP_HPP
  27 
  28 #include "asm/assembler.hpp"
  29 #include "c1/c1_Defs.hpp"
  30 #include "c1/c1_LIR.hpp"
  31 #include "code/vmreg.hpp"
  32 #include "memory/allocation.hpp"
  33 #include "runtime/frame.hpp"
  34 #include "runtime/synchronizer.hpp"
  35 #include "utilities/globalDefinitions.hpp"
  36 
  37 class ciMethod;
  38 class CallingConvention;
  39 class BasicTypeArray;
  40 class BasicTypeList;
  41 
  42 //--------------------------------------------------------
  43 //               FrameMap
  44 //--------------------------------------------------------
  45 
  46 //  This class is responsible of mapping items (locals, monitors, spill
  47 //  slots and registers to their frame location
  48 //
  49 //  The monitors are specified by a consecutive index, although each monitor entry
  50 //  occupies two words. The monitor_index is 0.._num_monitors
  51 //  The spill index is similar to local index; it is in range 0..(open)
  52 //
  53 //  The CPU registers are mapped using a fixed table; register with number 0
  54 //  is the most used one.
  55 
  56 
  57 //   stack grow direction -->                                        SP
  58 //  +----------+---+----------+-------+------------------------+-----+
  59 //  |arguments | x | monitors | spill | reserved argument area | ABI |
  60 //  +----------+---+----------+-------+------------------------+-----+
  61 //
  62 //  x =  ABI area (SPARC) or  return adress and link (i486)
  63 //  ABI  = ABI area (SPARC) or nothing (i486)
  64 
  65 
  66 class LIR_OprDesc;
  67 typedef LIR_OprDesc* LIR_Opr;
  68 
  69 
  70 class FrameMap : public CompilationResourceObj {
  71  public:
  72   enum {
  73     nof_cpu_regs = pd_nof_cpu_regs_frame_map,
  74     nof_fpu_regs = pd_nof_fpu_regs_frame_map,
  75 
  76     nof_cpu_regs_reg_alloc = pd_nof_cpu_regs_reg_alloc,
  77     nof_fpu_regs_reg_alloc = pd_nof_fpu_regs_reg_alloc,
  78 
  79     max_nof_caller_save_cpu_regs = pd_nof_caller_save_cpu_regs_frame_map,
  80     nof_caller_save_fpu_regs     = pd_nof_caller_save_fpu_regs_frame_map,
  81 
  82     spill_slot_size_in_bytes = 4
  83   };
  84 
  85 #ifdef TARGET_ARCH_x86
  86 # include "c1_FrameMap_x86.hpp"
  87 #endif
  88 #ifdef TARGET_ARCH_sparc
  89 # include "c1_FrameMap_sparc.hpp"
  90 #endif
  91 
  92 
  93   friend class LIR_OprDesc;
  94 
  95  private:
  96   static bool         _init_done;
  97   static Register     _cpu_rnr2reg [nof_cpu_regs];
  98   static int          _cpu_reg2rnr [nof_cpu_regs];
  99 
 100   static LIR_Opr      _caller_save_cpu_regs [max_nof_caller_save_cpu_regs];
 101   static LIR_Opr      _caller_save_fpu_regs [nof_caller_save_fpu_regs];
 102 
 103   int                 _framesize;
 104   int                 _argcount;
 105   int                 _num_monitors;
 106   int                 _num_spills;
 107   int                 _reserved_argument_area_size;
 108   int                 _oop_map_arg_count;
 109 
 110   CallingConvention*  _incoming_arguments;
 111   intArray*           _argument_locations;
 112 
 113   void check_spill_index   (int spill_index)   const { assert(spill_index   >= 0, "bad index"); }
 114   void check_monitor_index (int monitor_index) const { assert(monitor_index >= 0 &&
 115                                                               monitor_index < _num_monitors, "bad index"); }
 116 
 117   static Register cpu_rnr2reg (int rnr) {
 118     assert(_init_done, "tables not initialized");
 119     debug_only(cpu_range_check(rnr);)
 120     return _cpu_rnr2reg[rnr];
 121   }
 122 
 123   static int cpu_reg2rnr (Register reg) {
 124     assert(_init_done, "tables not initialized");
 125     debug_only(cpu_range_check(reg->encoding());)
 126     return _cpu_reg2rnr[reg->encoding()];
 127   }
 128 
 129   static void map_register(int rnr, Register reg) {
 130     debug_only(cpu_range_check(rnr);)
 131     debug_only(cpu_range_check(reg->encoding());)
 132     _cpu_rnr2reg[rnr] = reg;
 133     _cpu_reg2rnr[reg->encoding()] = rnr;
 134   }
 135 
 136   void update_reserved_argument_area_size (int size) {
 137     assert(size >= 0, "check");
 138     _reserved_argument_area_size = MAX2(_reserved_argument_area_size, size);
 139   }
 140 
 141  protected:
 142 #ifndef PRODUCT
 143   static void cpu_range_check (int rnr)          { assert(0 <= rnr && rnr < nof_cpu_regs, "cpu register number is too big"); }
 144   static void fpu_range_check (int rnr)          { assert(0 <= rnr && rnr < nof_fpu_regs, "fpu register number is too big"); }
 145 #endif
 146 
 147 
 148   ByteSize sp_offset_for_monitor_base(const int idx) const;
 149 
 150   Address make_new_address(ByteSize sp_offset) const;
 151 
 152   ByteSize sp_offset_for_slot(const int idx) const;
 153   ByteSize sp_offset_for_double_slot(const int idx) const;
 154   ByteSize sp_offset_for_spill(const int idx) const;
 155   ByteSize sp_offset_for_monitor_lock(int monitor_index) const;
 156   ByteSize sp_offset_for_monitor_object(int monitor_index) const;
 157 
 158   VMReg sp_offset2vmreg(ByteSize offset) const;
 159 
 160   // platform dependent hook used to check that frame is properly
 161   // addressable on the platform.  Used by sparc to verify that all
 162   // stack addresses are expressable in a simm13.
 163   bool validate_frame();
 164 
 165   static LIR_Opr map_to_opr(BasicType type, VMRegPair* reg, bool incoming);
 166 
 167  public:
 168   // Opr representing the stack_pointer on this platform
 169   static LIR_Opr stack_pointer();
 170 
 171   // JSR 292
 172   static LIR_Opr method_handle_invoke_SP_save_opr();
 173 
 174   static BasicTypeArray*     signature_type_array_for(const ciMethod* method);
 175 
 176   // for outgoing calls, these also update the reserved area to
 177   // include space for arguments and any ABI area.
 178   CallingConvention* c_calling_convention (const BasicTypeArray* signature);
 179   CallingConvention* java_calling_convention (const BasicTypeArray* signature, bool outgoing);
 180 
 181   // deopt support
 182   ByteSize sp_offset_for_orig_pc() { return sp_offset_for_monitor_base(_num_monitors); }
 183 
 184   static LIR_Opr as_opr(Register r) {
 185     return LIR_OprFact::single_cpu(cpu_reg2rnr(r));
 186   }
 187   static LIR_Opr as_oop_opr(Register r) {
 188     return LIR_OprFact::single_cpu_oop(cpu_reg2rnr(r));
 189   }
 190 
 191   FrameMap(ciMethod* method, int monitors, int reserved_argument_area_size);
 192   bool finalize_frame(int nof_slots);
 193 
 194   int   reserved_argument_area_size () const     { return _reserved_argument_area_size; }
 195   int   framesize                   () const     { assert(_framesize != -1, "hasn't been calculated"); return _framesize; }
 196   ByteSize framesize_in_bytes       () const     { return in_ByteSize(framesize() * 4); }
 197   int   num_monitors                () const     { return _num_monitors; }
 198   int   num_spills                  () const     { assert(_num_spills >= 0, "not set"); return _num_spills; }
 199   int   argcount              () const     { assert(_argcount >= 0, "not set"); return _argcount; }
 200 
 201   int oop_map_arg_count() const { return _oop_map_arg_count; }
 202 
 203   CallingConvention* incoming_arguments() const  { return _incoming_arguments; }
 204 
 205   // convenience routines
 206   Address address_for_slot(int index, int sp_adjust = 0) const {
 207     return make_new_address(sp_offset_for_slot(index) + in_ByteSize(sp_adjust));
 208   }
 209   Address address_for_double_slot(int index, int sp_adjust = 0) const {
 210     return make_new_address(sp_offset_for_double_slot(index) + in_ByteSize(sp_adjust));
 211   }
 212   Address address_for_monitor_lock(int monitor_index) const {
 213     return make_new_address(sp_offset_for_monitor_lock(monitor_index));
 214   }
 215   Address address_for_monitor_object(int monitor_index) const {
 216     return make_new_address(sp_offset_for_monitor_object(monitor_index));
 217   }
 218 
 219   void print_frame_layout() const;
 220 
 221   // Creates Location describing desired slot and returns it via pointer
 222   // to Location object. Returns true if the stack frame offset was legal
 223   // (as defined by Location::legal_offset_in_bytes()), false otherwise.
 224   // Do not use the returned location if this returns false.
 225   bool location_for_sp_offset(ByteSize byte_offset_from_sp,
 226                               Location::Type loc_type, Location* loc) const;
 227 
 228   bool location_for_monitor_lock  (int monitor_index, Location* loc) const {
 229     return location_for_sp_offset(sp_offset_for_monitor_lock(monitor_index), Location::normal, loc);
 230   }
 231   bool location_for_monitor_object(int monitor_index, Location* loc) const {
 232     return location_for_sp_offset(sp_offset_for_monitor_object(monitor_index), Location::oop, loc);
 233   }
 234   bool locations_for_slot  (int index, Location::Type loc_type,
 235                             Location* loc, Location* second = NULL) const;
 236 
 237   VMReg slot_regname(int index) const {
 238     return sp_offset2vmreg(sp_offset_for_slot(index));
 239   }
 240   VMReg monitor_object_regname(int monitor_index) const {
 241     return sp_offset2vmreg(sp_offset_for_monitor_object(monitor_index));
 242   }
 243   VMReg regname(LIR_Opr opr) const;
 244 
 245   static LIR_Opr caller_save_cpu_reg_at(int i) {
 246     assert(i >= 0 && i < max_nof_caller_save_cpu_regs, "out of bounds");
 247     return _caller_save_cpu_regs[i];
 248   }
 249 
 250   static LIR_Opr caller_save_fpu_reg_at(int i) {
 251     assert(i >= 0 && i < nof_caller_save_fpu_regs, "out of bounds");
 252     return _caller_save_fpu_regs[i];
 253   }
 254 
 255   static void initialize();
 256 };
 257 
 258 //               CallingConvention
 259 //--------------------------------------------------------
 260 
 261 class CallingConvention: public ResourceObj {
 262  private:
 263   LIR_OprList* _args;
 264   int          _reserved_stack_slots;
 265 
 266  public:
 267   CallingConvention (LIR_OprList* args, int reserved_stack_slots)
 268     : _args(args)
 269     , _reserved_stack_slots(reserved_stack_slots)  {}
 270 
 271   LIR_OprList* args()       { return _args; }
 272 
 273   LIR_Opr at(int i) const   { return _args->at(i); }
 274   int length() const        { return _args->length(); }
 275 
 276   // Indicates number of real frame slots used by arguments passed on stack.
 277   int reserved_stack_slots() const            { return _reserved_stack_slots; }
 278 
 279 #ifndef PRODUCT
 280   void print () const {
 281     for (int i = 0; i < length(); i++) {
 282       at(i)->print();
 283     }
 284   }
 285 #endif // PRODUCT
 286 };
 287 
 288 #endif // SHARE_VM_C1_C1_FRAMEMAP_HPP