dispatchTable.cpp

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/* Copyright 1994 - 1996, LongView Technologies L.L.C. $Revision: 1.20 $ */
/* Copyright (c) 2006, Sun Microsystems, Inc.
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# include "incls/_precompiled.incl"
# include "incls/_dispatchTable.cpp.incl"

//
// The following defines the dispatch table for the interpreter.
// - inserted by Lars to please the Microsoft VC++ 2.0 linker.
//
// %note: A link error will occur if a conflict exists between
//        the dispatch table and the interpreter.
//

extern "C" void illegal();
extern "C" void single_step_stub();

#define L(num) interpreter_case_##num
#define M(num) &interpreter_case_##num
#define D(num) extern "C" void L(num)##();
#define _(num) extern "C" void L(num)##() { illegal(); }

//0      1      2      3      4      5      6      7      8      9      A      B      C      D      E      F
_(0)   _(1)   _(2)   _(3)   _(4)   _(5)   _(6)   _(7)   _(8)   _(9)   _(10)  _(11)  _(12)  _(13)  _(14)  _(15)  // 0
_(16)  _(17)  _(18)  _(19)  _(20)  _(21)  _(22)  _(23)  _(24)  _(25)  _(26)  _(27)  _(28)  _(29)  _(30)  _(31)  // 1
_(32)  _(33)  _(34)  _(35)  _(36)  _(37)  _(38)  _(39)  _(40)  _(41)  _(42)  _(43)  _(44)  _(45)  _(46)  _(47)  // 2
_(48)  _(49)  _(50)  _(51)  _(52)  _(53)  _(54)  _(55)  _(56)  _(57)  _(58)  _(59)  _(60)  _(61)  _(62)  _(63)  // 3
_(64)  _(65)  _(66)  D(67)  D(68)  D(69)  D(70)  D(71)  _(72)  _(73)  _(74)  _(75)  _(76)  _(77)  _(78)  _(79)  // 4
_(80)  _(81)  _(82)  D(83)  D(84)  D(85)  D(86)  D(87)  _(88)  _(89)  _(90)  _(91)  _(92)  _(93)  _(94)  _(95)  // 5
D(96)  D(97)  D(98)  D(99)  D(100) D(101) D(102) D(103) _(104) D(105) D(106) D(107) D(108) D(109) D(110) D(111) // 6
D(112) D(113) D(114) D(115) D(116) D(117) D(118) D(119) D(120) D(121) D(122) D(123) D(124) D(125) D(126) D(127) // 7
_(128) _(129) _(130) _(131) _(132) _(133) _(134) _(135) _(136) _(137) _(138) _(139) D(140) D(141) D(142) D(143) // 8
_(144) _(145) _(146) _(147) _(148) _(149) _(150) _(151) _(152) _(153) _(154) _(155) D(156) D(157) D(158) D(159) // 9
_(160) _(161) _(162) _(163) _(164) _(165) _(166) _(167) _(168) _(169) _(170) _(171) D(172) D(173) _(174) _(175) // A
_(176) D(177) _(178) D(179) _(180) _(181) _(182) _(183) D(184) D(185) _(186) _(187) _(188) _(189) _(190) _(191) // B
_(192) D(193) _(194) D(195) _(196) _(197) _(198) _(199) D(200) D(201) _(202) _(203) _(204) _(205) _(206) _(207) // C
_(208) _(209) _(210) _(211) _(212) _(213) _(214) _(215) _(216) _(217) _(218) _(219) _(220) _(221) _(222) _(223) // D
_(224) _(225) _(226) _(227) _(228) _(229) _(230) _(231) _(232) _(233) _(234) _(235) _(236) _(237) D(238) D(239) // E
_(240) _(241) _(242) _(243) _(244) _(245) _(246) _(247) _(248) _(249) _(250) _(251) _(252) _(253) _(254) _(255) // F


// The dispatch table holds the dispatch addresses currently used (i.e., individual entries might be
// patched with a stub-routine, etc.). The original table holds the untouched original entry points.
//
// Note: At the time beeing, the original tale is modified via Bytecodes::set_entry_point(...) for
//       the generated bytecodes.

extern "C" doFn dispatch_table[Bytecodes::number_of_codes];
extern "C" doFn original_table[Bytecodes::number_of_codes];

doFn dispatch_table[Bytecodes::number_of_codes];
doFn original_table[Bytecodes::number_of_codes] = {
  M(0),  M(1),  M(2),  M(3),  M(4),  M(5),  M(6),  M(7),  M(8),  M(9),  M(10), M(11), M(12), M(13), M(14), M(15),  // 0
  M(16), M(17), M(18), M(19), M(20), M(21), M(22), M(23), M(24), M(25), M(26), M(27), M(28), M(29), M(30), M(31),  // 1
  M(32), M(33), M(34), M(35), M(36), M(37), M(38), M(39), M(40), M(41), M(42), M(43), M(44), M(45), M(46), M(47),  // 2
  M(48), M(49), M(50), M(51), M(52), M(53), M(54), M(55), M(56), M(57), M(58), M(59), M(60), M(61), M(62), M(63),  // 3
  M(64), M(65), M(66), M(67), M(68), M(69), M(70), M(71), M(72), M(73), M(74), M(75), M(76), M(77), M(78), M(79),  // 4
  M(80), M(81), M(82), M(83), M(84), M(85), M(86), M(87), M(88), M(89), M(90), M(91), M(92), M(93), M(94), M(95),  // 5
  M(96), M(97), M(98), M(99), M(100),M(101),M(102),M(103),M(104),M(105),M(106),M(107),M(108),M(109),M(110),M(111), // 6
  M(112),M(113),M(114),M(115),M(116),M(117),M(118),M(119),M(120),M(121),M(122),M(123),M(124),M(125),M(126),M(127), // 7
  M(128),M(129),M(130),M(131),M(132),M(133),M(134),M(135),M(136),M(137),M(138),M(139),M(140),M(141),M(142),M(143), // 8
  M(144),M(145),M(146),M(147),M(148),M(149),M(150),M(151),M(152),M(153),M(154),M(155),M(156),M(157),M(158),M(159), // 9
  M(160),M(161),M(162),M(163),M(164),M(165),M(166),M(167),M(168),M(169),M(170),M(171),M(172),M(173),M(174),M(175), // A
  M(176),M(177),M(178),M(179),M(180),M(181),M(182),M(183),M(184),M(185),M(186),M(187),M(188),M(189),M(190),M(191), // B
  M(192),M(193),M(194),M(195),M(196),M(197),M(198),M(199),M(200),M(201),M(202),M(203),M(204),M(205),M(206),M(207), // C
  M(208),M(209),M(210),M(211),M(212),M(213),M(214),M(215),M(216),M(217),M(218),M(219),M(220),M(221),M(222),M(223), // D
  M(224),M(225),M(226),M(227),M(228),M(229),M(230),M(231),M(232),M(233),M(234),M(235),M(236),M(237),M(238),M(239), // E
  M(240),M(241),M(242),M(243),M(244),M(245),M(246),M(247),M(248),M(249),M(250),M(251),M(252),M(253),M(254),M(255)  // F
};


extern "C" int* frame_breakpoint = (int*) -1;

dispatchTable::Mode dispatchTable::mode;


u_char** dispatchTable::table() {
  return (u_char**)&dispatch_table[0];
}


void dispatchTable::reset() {
  for (int index = 0; index < Bytecodes::number_of_codes; index++) {
    dispatch_table[index] = original_table[index];
  }
  mode = normal_mode;
}


void dispatchTable::patch_with_sst_stub() {
  for (int index = 0; index < Bytecodes::number_of_codes; index++) {
    if (Bytecodes::single_step(Bytecodes::Code(index))) {
      dispatch_table[index] = &single_step_stub;
    } else {
      dispatch_table[index] = original_table[index];
    }
  }
}


void dispatchTable::intercept_for_step() {
  if (!in_step_mode()) {
    patch_with_sst_stub();
    mode = step_mode;
    frame_breakpoint = (int*) -1;
  }
}


void dispatchTable::intercept_for_next(int* fr) {
  frame_breakpoint = fr;
  if (!in_next_mode()) {
    patch_with_sst_stub();
    mode = next_mode;
  }
}


static int return_codes_size = 12;
static Bytecodes::Code return_codes[] = {
  Bytecodes::return_tos_pop_0,
  Bytecodes::return_tos_pop_1,
  Bytecodes::return_tos_pop_2,
  Bytecodes::return_tos_pop_n,

  Bytecodes::return_self_pop_0,
  Bytecodes::return_self_pop_1,
  Bytecodes::return_self_pop_2,
  Bytecodes::return_self_pop_n,

  Bytecodes::return_tos_zap_pop_n,
  Bytecodes::return_self_zap_pop_n,
  Bytecodes::non_local_return_tos_pop_n,
  Bytecodes::non_local_return_self_pop_n
};


void dispatchTable::intercept_for_return(int* fr)  {
  frame_breakpoint = fr;
  if (!in_return_mode()) {
    reset();
    for (int index = 0; index < return_codes_size; index++) {
      Bytecodes::Code code = return_codes[index];
      if (Bytecodes::single_step(code)) {
        dispatch_table[code] = &single_step_stub;
      } else {
        dispatch_table[index] = original_table[index];
      }
    }
    mode = next_mode;
  }
}


void dispatchTable_init() {
  dispatchTable::reset();
}


void intercept_for_single_step() {
  dispatchTable::intercept_for_step();
}


void print_dt() {
  for (int i = 0; i < 255; i++) {
    printf("0x%02x: 0x%08x\n", i, ((int*)dispatchTable::table())[i]);
  }
  printf("\n");
}

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