hphp/runtime/vm/jit/reg-alloc.h

   1 /*
   2    +----------------------------------------------------------------------+
   3    | HipHop for PHP                                                       |
   4    +----------------------------------------------------------------------+
   5    | Copyright (c) 2010-present Facebook, Inc. (http://www.facebook.com)  |
   6    +----------------------------------------------------------------------+
   7    | This source file is subject to version 3.01 of the PHP license,      |
   8    | that is bundled with this package in the file LICENSE, and is        |
   9    | available through the world-wide-web at the following url:           |
  10    | http://www.php.net/license/3_01.txt                                  |
  11    | If you did not receive a copy of the PHP license and are unable to   |
  12    | obtain it through the world-wide-web, please send a note to          |
  13    | license@php.net so we can mail you a copy immediately.               |
  14    +----------------------------------------------------------------------+
  15 */
  16
  17 #pragma once
  18
  19 #include <vector>
  20
  21 #include "hphp/runtime/vm/jit/block.h"
  22 #include "hphp/runtime/vm/jit/phys-reg.h"
  23 #include "hphp/runtime/vm/jit/state-vector.h"
  24 #include "hphp/runtime/vm/jit/translator-runtime.h"
  25
  26 namespace HPHP::jit {
  27
  28 ///////////////////////////////////////////////////////////////////////////////
  29
  30 struct Abi;
  31 struct IRUnit;
  32 struct Vinstr;
  33 struct Vunit;
  34
  35 namespace irlower { struct IRLS; }
  36
  37 ///////////////////////////////////////////////////////////////////////////////
  38
  39 // Native stack layout:
  40 // | enterTCHelper |
  41 // +---------------+
  42 // |  return addr  |
  43 // |  saved %rbp   |
  44 // +---------------+
  45 // |               | ...up to kMaxSpillSlots
  46 // |  spill slots  | <-- spill[1]
  47 // |               | <-- spill[0]
  48 // +---------------+
  49 //
  50
  51 /*
  52  * Return the byte offset to a spill slot.
  53  */
  54 inline uint32_t slotOffset(uint32_t slot) {
  55   return slot * sizeof(uint64_t);
  56 }
  57
  58 /*
  59  * Return true if the offset of this spill slot is 16-byte aligned.
  60  */
  61 inline bool isSlotAligned(uint32_t slot) {
  62   return slot % 2 == 0;
  63 }
  64
  65 const size_t kMaxSpillSlots = 128;
  66
  67 /*
  68  * Return InvalidReg, or a specific register to force `tmp' to use.
  69  */
  70 PhysReg forceAlloc(const SSATmp& tmp);
  71
  72 /*
  73  * Assign virtual registers to all SSATmps used or defined in reachable blocks.
  74  */
  75 void assignRegs(const IRUnit& unit, Vunit& vunit, irlower::IRLS& state,
  76                 const BlockList& blocks);
  77
  78 /*
  79  * Return the set of physical registers implicitly accessed (used or defined).
  80  */
  81 void getEffects(const Abi& abi, const Vinstr& i,
  82                 RegSet& uses, RegSet& across, RegSet& defs);
  83
  84 ///////////////////////////////////////////////////////////////////////////////
  85
  86 }
  87