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path: root/client/shaders/nodes_shader/opengl_fragment.glsl
Commit message (Collapse)AuthorAge
* Fix GLES shader support after #9247 (#10727)Vitaliy2020-12-22
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* Cleanup shader generation code (#10663)Vitaliy2020-12-19
| | | Shader generation is a mess. This commit cleans some parts up, including dropping remains of HLSL support which was never actually implemented.
* Fix MSAA stripes (#9247)HybridDog2020-12-04
| | | | | This only works when shaders are enabled. The centroid varying avoids that the textures (which repeat themselves out of bounds) are sampled out of bounds in MSAA. If MSAA (called FSAA in minetest) is disabled, the centroid keyword does nothing.
* Shaders for Android (GLES 2) (#10506)Vitaliy2020-10-25
| | | | | Shader support for OpenGL ES 2 devices (Android) Co-authored-by: sfan5 <sfan5@live.de>
* Remove all bump mapping and parallax occlusion related code.Lars2020-10-17
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* Remove "generate normal maps" feature (#10313)hecks2020-09-14
| | | | | Erase all traces of normal "generation" from fragment shaders Remove the "feature" from the engine and default config Remove any leftover documentation of it
* shaders: Fix transparency on GC7000L (#10036)mntmn2020-08-25
| | | Workaround for the missing GL_ALPHA_TEST implementation in Mesa (etnaviv driver).
* Simple shader fixes. (#8991)lhofhansl2019-09-26
| | | | | 1. Pass current camera offset to shader, so shader have access to the global coordinates 2. Pass animation timer to fragment shader. C++ code is already there, just wasn't declared in the shader 3. Delay animation timer wrap-around (from 100s to about 16 minutes)
* Fix fog weirdness (#5146)numberZero2017-01-31
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* Shaders: Remove unnecessary 'if' statementsLars Hofhansl2016-12-24
| | | | | | Pull if GENERATE_NORMALMAPS == 1 into the template to avoid evaluating it for each fragment. Remove if (fogDistance != 0.0).
* Fog: Make fraction of visible distance at which fog starts configurableLars Hofhansl2016-12-07
| | | | | | Optimise the fetching of global settings 'camera_smoothing', 'cinematic' and 'cinematic_camera_smoothing'. Cache 'cam_smoothing'.
* Fix unexplained shader issue (glsl compiler bug??) (#4757)Rogier-52016-11-17
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* Shaders: Remove special handling for liquids. (#4670)lhofhansl2016-10-26
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* Shaders: Apply tone mapping before fog calculation.Lars Hofhansl2016-10-25
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* Shaders: Harmonize Irrlicht and shader fog calculationsLars Hofhansl2016-10-24
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* Use range-based fog instead of z-plane based.Lars Hofhansl2016-10-13
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* Shaders: fix fog not affecting opaque liquidsRealBadAngel2016-02-23
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* Filmic HDR tone mappingRealBadAngel2016-02-09
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* Speed up and make more accurate relief mappingRealBadAngel2015-12-10
| | | | using linear + binary search.
* Remove use of engine sent texture tiling flags - theyre no longer neededRealBadAngel2015-08-20
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* Fix relief mapping issuesRealBadAngel2015-07-16
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* Shaders fixes and cleanup relief mapping code.RealBadAngel2015-07-02
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* Bugfix: variable type mismatchRealBadAngel2015-06-28
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* Remove textures vertical offset. Fix for area enabling parallax.RealBadAngel2015-06-21
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* Improved parallax mapping. Generate heightmaps on the fly.RealBadAngel2015-06-14
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* Optimize bumpmapping mathematicsLoic Blot2015-01-16
| | | | | | OpenGL_vertex: * bufferize a duplicate calcul * Factorize vertexes
* Revert "Optimize bumpmapping mathematics"Craig Robbins2015-01-16
| | | | This reverts commit 148fffb0f23fa437c67639ff3cc69177fb71d76a.
* Optimize bumpmapping mathematicsLoic Blot2015-01-15
| | | | | | OpenGL_vertex: * bufferize a duplicate calcul * Factorize vertexes
* Improved faces shading with and without shaders.RealBadAngel2014-06-17
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* Unite nodes shaders.RealBadAngel2014-06-15
Pass drawtype and material type to shaders. Move shaders generation to startup only. Allow assign shaders per tile. Initial code to support water surface shader.
generated by cgit v1.2.3 (git 2.39.1) at 2025-02-21 21:17:21 +0000
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/*
** $Id: lcode.c,v 2.25.1.5 2011/01/31 14:53:16 roberto Exp $
** Code generator for Lua
** See Copyright Notice in lua.h
*/


#include <stdlib.h>

#define lcode_c
#define LUA_CORE

#include "lua.h"

#include "lcode.h"
#include "ldebug.h"
#include "ldo.h"
#include "lgc.h"
#include "llex.h"
#include "lmem.h"
#include "lobject.h"
#include "lopcodes.h"
#include "lparser.h"
#include "ltable.h"


#define hasjumps(e)	((e)->t != (e)->f)


static int isnumeral(expdesc *e) {
  return (e->k == VKNUM && e->t == NO_JUMP && e->f == NO_JUMP);
}


void luaK_nil (FuncState *fs, int from, int n) {
  Instruction *previous;
  if (fs->pc > fs->lasttarget) {  /* no jumps to current position? */
    if (fs->pc == 0) {  /* function start? */
      if (from >= fs->nactvar)
        return;  /* positions are already clean */
    }
    else {
      previous = &fs->f->code[fs->pc-1];
      if (GET_OPCODE(*previous) == OP_LOADNIL) {
        int pfrom = GETARG_A(*previous);
        int pto = GETARG_B(*previous);
        if (pfrom <= from && from <= pto+1) {  /* can connect both? */
          if (from+n-1 > pto)
            SETARG_B(*previous, from+n-1);
          return;
        }
      }
    }
  }
  luaK_codeABC(fs, OP_LOADNIL, from, from+n-1, 0);  /* else no optimization */
}


int luaK_jump (FuncState *fs) {
  int jpc = fs->jpc;  /* save list of jumps to here */
  int j;
  fs->jpc = NO_JUMP;
  j = luaK_codeAsBx(fs, OP_JMP, 0, NO_JUMP);
  luaK_concat(fs, &j, jpc);  /* keep them on hold */
  return j;
}


void luaK_ret (FuncState *fs, int first, int nret) {
  luaK_codeABC(fs, OP_RETURN, first, nret+1, 0);
}


static int condjump (FuncState *fs, OpCode op, int A, int B, int C) {
  luaK_codeABC(fs, op, A, B, C);
  return luaK_jump(fs);
}


static void fixjump (FuncState *fs, int pc, int dest) {
  Instruction *jmp = &fs->f->code[pc];
  int offset = dest-(pc+1);
  lua_assert(dest != NO_JUMP);
  if (abs(offset) > MAXARG_sBx)
    luaX_syntaxerror(fs->ls, "control structure too long");
  SETARG_sBx(*jmp, offset);
}


/*
** returns current `pc' and marks it as a jump target (to avoid wrong
** optimizations with consecutive instructions not in the same basic block).
*/
int luaK_getlabel (FuncState *fs) {
  fs->lasttarget = fs->pc;
  return fs->pc;
}


static int getjump (FuncState *fs, int pc) {
  int offset = GETARG_sBx(fs->f->code[pc]);
  if (offset == NO_JUMP)  /* point to itself represents end of list */
    return NO_JUMP;  /* end of list */
  else
    return (pc+1)+offset;  /* turn offset into absolute position */
}


static Instruction *getjumpcontrol (FuncState *fs, int pc) {
  Instruction *pi = &fs->f->code[pc];
  if (pc >= 1 && testTMode(GET_OPCODE(*(pi-1))))
    return pi-1;
  else
    return pi;
}


/*
** check whether list has any jump that do not produce a value
** (or produce an inverted value)
*/
static int need_value (FuncState *fs, int list) {
  for (; list != NO_JUMP; list = getjump(fs, list)) {
    Instruction i = *getjumpcontrol(fs, list);
    if (GET_OPCODE(i) != OP_TESTSET) return 1;
  }
  return 0;  /* not found */
}


static int patchtestreg (FuncState *fs, int node, int reg) {
  Instruction *i = getjumpcontrol(fs, node);
  if (GET_OPCODE(*i) != OP_TESTSET)
    return 0;  /* cannot patch other instructions */
  if (reg != NO_REG && reg != GETARG_B(*i))
    SETARG_A(*i, reg);
  else  /* no register to put value or register already has the value */
    *i = CREATE_ABC(OP_TEST, GETARG_B(*i), 0, GETARG_C(*i));

  return 1;
}


static void removevalues (FuncState *fs, int list) {
  for (; list != NO_JUMP; list = getjump(fs, list))
      patchtestreg(fs, list, NO_REG);
}


static void patchlistaux (FuncState *fs, int list, int vtarget, int reg,
                          int dtarget) {
  while (list != NO_JUMP) {
    int next = getjump(fs, list);
    if (patchtestreg(fs, list, reg))
      fixjump(fs, list, vtarget);
    else
      fixjump(fs, list, dtarget);  /* jump to default target */
    list = next;
  }
}


static void dischargejpc (FuncState *fs) {
  patchlistaux(fs, fs->jpc, fs->pc, NO_REG, fs->pc);
  fs->jpc = NO_JUMP;
}


void luaK_patchlist (FuncState *fs, int list, int target) {
  if (target == fs->pc)
    luaK_patchtohere(fs, list);
  else {
    lua_assert(target < fs->pc);
    patchlistaux(fs, list, target, NO_REG, target);
  }
}


void luaK_patchtohere (FuncState *fs, int list) {
  luaK_getlabel(fs);
  luaK_concat(fs, &fs->jpc, list);
}


void luaK_concat (FuncState *fs, int *l1, int l2) {
  if (l2 == NO_JUMP) return;
  else if (*l1 == NO_JUMP)
    *l1 = l2;
  else {
    int list = *l1;
    int next;
    while ((next = getjump(fs, list)) != NO_JUMP)  /* find last element */
      list = next;
    fixjump(fs, list, l2);
  }
}


void luaK_checkstack (FuncState *fs, int n) {
  int newstack = fs->freereg + n;
  if (newstack > fs->f->maxstacksize) {
    if (newstack >= MAXSTACK)
      luaX_syntaxerror(fs->ls, "function or expression too complex");
    fs->f->maxstacksize = cast_byte(newstack);
  }
}


void luaK_reserveregs (FuncState *fs, int n) {
  luaK_checkstack(fs, n);
  fs->freereg += n;
}


static void freereg (FuncState *fs, int reg) {
  if (!ISK(reg) && reg >= fs->nactvar) {
    fs->freereg--;
    lua_assert(reg == fs->freereg);
  }
}


static void freeexp (FuncState *fs, expdesc *e) {
  if (e->k == VNONRELOC)
    freereg(fs, e->u.s.info);
}


static int addk (FuncState *fs, TValue *k, TValue *v) {
  lua_State *L = fs->L;
  TValue *idx = luaH_set(L, fs->h, k);
  Proto *f = fs->f;
  int oldsize = f->sizek;
  if (ttisnumber(idx)) {
    lua_assert(luaO_rawequalObj(&fs->f->k[cast_int(nvalue(idx))], v));
    return cast_int(nvalue(idx));
  }
  else {  /* constant not found; create a new entry */
    setnvalue(idx, cast_num(fs->nk));
    luaM_growvector(L, f->k, fs->nk, f->sizek, TValue,
                    MAXARG_Bx, "constant table overflow");
    while (oldsize < f->sizek) setnilvalue(&f->k[oldsize++]);
    setobj(L, &f->k[fs->nk], v);
    luaC_barrier(L, f, v);
    return fs->nk++;
  }
}


int luaK_stringK (FuncState *fs, TString *s) {
  TValue o;
  setsvalue(fs->L, &o, s);
  return addk(fs, &o, &o);
}


int luaK_numberK (FuncState *fs, lua_Number r) {
  TValue o;
  setnvalue(&o, r);
  return addk(fs, &o, &o);
}


static int boolK (FuncState *fs, int b) {
  TValue o;
  setbvalue(&o, b);
  return addk(fs, &o, &o);
}


static int nilK (FuncState *fs) {
  TValue k, v;
  setnilvalue(&v);
  /* cannot use nil as key; instead use table itself to represent nil */
  sethvalue(fs->L, &k, fs->h);
  return addk(fs, &k, &v);
}


void luaK_setreturns (FuncState *fs, expdesc *e, int nresults) {
  if (e->k == VCALL) {  /* expression is an open function call? */
    SETARG_C(getcode(fs, e), nresults+1);
  }
  else if (e->k == VVARARG) {
    SETARG_B(getcode(fs, e), nresults+1);
    SETARG_A(getcode(fs, e), fs->freereg);
    luaK_reserveregs(fs, 1);
  }
}


void luaK_setoneret (FuncState *fs, expdesc *e) {
  if (e->k == VCALL) {  /* expression is an open function call? */
    e->k = VNONRELOC;
    e->u.s.info = GETARG_A(getcode(fs, e));
  }
  else if (e->k == VVARARG) {
    SETARG_B(getcode(fs, e), 2);
    e->k = VRELOCABLE;  /* can relocate its simple result */
  }
}


void luaK_dischargevars (FuncState *fs, expdesc *e) {
  switch (e->k) {
    case VLOCAL: {
      e->k = VNONRELOC;
      break;
    }
    case VUPVAL: {
      e->u.s.info = luaK_codeABC(fs, OP_GETUPVAL, 0, e->u.s.info, 0);
      e->k = VRELOCABLE;
      break;
    }
    case VGLOBAL: {
      e->u.s.info = luaK_codeABx(fs, OP_GETGLOBAL, 0, e->u.s.info);
      e->k = VRELOCABLE;
      break;
    }
    case VINDEXED: {
      freereg(fs, e->u.s.aux);
      freereg(fs, e->u.s.info);
      e->u.s.info = luaK_codeABC(fs, OP_GETTABLE, 0, e->u.s.info, e->u.s.aux);
      e->k = VRELOCABLE;
      break;
    }
    case VVARARG:
    case VCALL: {
      luaK_setoneret(fs, e);
      break;
    }
    default: break;  /* there is one value available (somewhere) */
  }
}


static int code_label (FuncState *fs, int A, int b, int jump) {
  luaK_getlabel(fs);  /* those instructions may be jump targets */
  return luaK_codeABC(fs, OP_LOADBOOL, A, b, jump);
}


static void discharge2reg (FuncState *fs, expdesc *e, int reg) {
  luaK_dischargevars(fs, e);
  switch (e->k) {
    case VNIL: {
      luaK_nil(fs, reg, 1);
      break;
    }
    case VFALSE:  case VTRUE: {
      luaK_codeABC(fs, OP_LOADBOOL, reg, e->k == VTRUE, 0);
      break;
    }
    case VK: {
      luaK_codeABx(fs, OP_LOADK, reg, e->u.s.info);
      break;
    }
    case VKNUM: {
      luaK_codeABx(fs, OP_LOADK, reg, luaK_numberK(fs, e->u.nval));
      break;
    }
    case VRELOCABLE: {
      Instruction *pc = &getcode(fs, e);
      SETARG_A(*pc, reg);
      break;
    }
    case VNONRELOC: {
      if (reg != e->u.s.info)
        luaK_codeABC(fs, OP_MOVE, reg, e->u.s.info, 0);
      break;
    }
    default: {
      lua_assert(e->k == VVOID || e->k == VJMP);
      return;  /* nothing to do... */
    }
  }
  e->u.s.info = reg;
  e->k = VNONRELOC;
}


static void discharge2anyreg (FuncState *fs, expdesc *e) {
  if (e->k != VNONRELOC) {
    luaK_reserveregs(fs, 1);
    discharge2reg(fs, e, fs->freereg-1);
  }
}


static void exp2reg (FuncState *fs, expdesc *e, int reg) {
  discharge2reg(fs, e, reg);
  if (e->k == VJMP)
    luaK_concat(fs, &e->t, e->u.s.info);  /* put this jump in `t' list */
  if (hasjumps(e)) {
    int final;  /* position after whole expression */
    int p_f = NO_JUMP;  /* position of an eventual LOAD false */
    int p_t = NO_JUMP;  /* position of an eventual LOAD true */
    if (need_value(fs, e->t) || need_value(fs, e->f)) {
      int fj = (e->k == VJMP) ? NO_JUMP : luaK_jump(fs);
      p_f = code_label(fs, reg, 0, 1);
      p_t = code_label(fs, reg, 1, 0);
      luaK_patchtohere(fs, fj);
    }
    final = luaK_getlabel(fs);
    patchlistaux(fs, e->f, final, reg, p_f);
    patchlistaux(fs, e->t, final, reg, p_t);
  }
  e->f = e->t = NO_JUMP;
  e->u.s.info = reg;
  e->k = VNONRELOC;
}


void luaK_exp2nextreg (FuncState *fs, expdesc *e) {
  luaK_dischargevars(fs, e);
  freeexp(fs, e);
  luaK_reserveregs(fs, 1);
  exp2reg(fs, e, fs->freereg - 1);
}


int luaK_exp2anyreg (FuncState *fs, expdesc *e) {
  luaK_dischargevars(fs, e);
  if (e->k == VNONRELOC) {
    if (!hasjumps(e)) return e->u.s.info;  /* exp is already in a register */
    if (e->u.s.info >= fs->nactvar) {  /* reg. is not a local? */
      exp2reg(fs, e, e->u.s.info);  /* put value on it */
      return e->u.s.info;
    }
  }
  luaK_exp2nextreg(fs, e);  /* default */
  return e->u.s.info;
}


void luaK_exp2val (FuncState *fs, expdesc *e) {
  if (hasjumps(e))
    luaK_exp2anyreg(fs, e);
  else
    luaK_dischargevars(fs, e);
}


int luaK_exp2RK (FuncState *fs, expdesc *e) {
  luaK_exp2val(fs, e);
  switch (e->k) {
    case VKNUM:
    case VTRUE:
    case VFALSE:
    case VNIL: {
      if (fs->nk <= MAXINDEXRK) {  /* constant fit in RK operand? */
        e->u.s.info = (e->k == VNIL)  ? nilK(fs) :
                      (e->k == VKNUM) ? luaK_numberK(fs, e->u.nval) :
                                        boolK(fs, (e->k == VTRUE));
        e->k = VK;
        return RKASK(e->u.s.info);
      }
      else break;
    }
    case VK: {
      if (e->u.s.info <= MAXINDEXRK)  /* constant fit in argC? */
        return RKASK(e->u.s.info);
      else break;
    }
    default: break;
  }
  /* not a constant in the right range: put it in a register */
  return luaK_exp2anyreg(fs, e);
}


void luaK_storevar (FuncState *fs, expdesc *var, expdesc *ex) {
  switch (var->k) {
    case VLOCAL: {
      freeexp(fs, ex);
      exp2reg(fs, ex, var->u.s.info);
      return;
    }
    case VUPVAL: {
      int e = luaK_exp2anyreg(fs, ex);
      luaK_codeABC(fs, OP_SETUPVAL, e, var->u.s.info, 0);
      break;
    }
    case VGLOBAL: {
      int e = luaK_exp2anyreg(fs, ex);
      luaK_codeABx(fs, OP_SETGLOBAL, e, var->u.s.info);
      break;
    }
    case VINDEXED: {
      int e = luaK_exp2RK(fs, ex);
      luaK_codeABC(fs, OP_SETTABLE, var->u.s.info, var->u.s.aux, e);
      break;
    }
    default: {
      lua_assert(0);  /* invalid var kind to store */
      break;
    }
  }
  freeexp(fs, ex);
}


void luaK_self (FuncState *fs, expdesc *e, expdesc *key) {
  int func;
  luaK_exp2anyreg(fs, e);
  freeexp(fs, e);
  func = fs->freereg;
  luaK_reserveregs(fs, 2);
  luaK_codeABC(fs, OP_SELF, func, e->u.s.info, luaK_exp2RK(fs, key));
  freeexp(fs, key);
  e->u.s.info = func;
  e->k = VNONRELOC;
}


static void invertjump (FuncState *fs, expdesc *e) {
  Instruction *pc = getjumpcontrol(fs, e->u.s.info);
  lua_assert(testTMode(GET_OPCODE(*pc)) && GET_OPCODE(*pc) != OP_TESTSET &&
                                           GET_OPCODE(*pc) != OP_TEST);
  SETARG_A(*pc, !(GETARG_A(*pc)));
}


static int jumponcond (FuncState *fs, expdesc *e, int cond) {
  if (e->k == VRELOCABLE) {
    Instruction ie = getcode(fs, e);
    if (GET_OPCODE(ie) == OP_NOT) {
      fs->pc--;  /* remove previous OP_NOT */
      return condjump(fs, OP_TEST, GETARG_B(ie), 0, !cond);
    }
    /* else go through */
  }
  discharge2anyreg(fs, e);
  freeexp(fs, e);
  return condjump(fs, OP_TESTSET, NO_REG, e->u.s.info, cond);
}


void luaK_goiftrue (FuncState *fs, expdesc *e) {
  int pc;  /* pc of last jump */
  luaK_dischargevars(fs, e);
  switch (e->k) {
    case VK: case VKNUM: case VTRUE: {
      pc = NO_JUMP;  /* always true; do nothing */
      break;
    }
    case VJMP: {
      invertjump(fs, e);
      pc = e->u.s.info;
      break;
    }
    default: {
      pc = jumponcond(fs, e, 0);
      break;
    }
  }
  luaK_concat(fs, &e->f, pc);  /* insert last jump in `f' list */
  luaK_patchtohere(fs, e->t);
  e->t = NO_JUMP;
}


static void luaK_goiffalse (FuncState *fs, expdesc *e) {
  int pc;  /* pc of last jump */
  luaK_dischargevars(fs, e);
  switch (e->k) {
    case VNIL: case VFALSE: {
      pc = NO_JUMP;  /* always false; do nothing */
      break;
    }
    case VJMP: {
      pc = e->u.s.info;
      break;
    }
    default: {
      pc = jumponcond(fs, e, 1);
      break;
    }
  }
  luaK_concat(fs, &e->t, pc);  /* insert last jump in `t' list */
  luaK_patchtohere(fs, e->f);
  e->f = NO_JUMP;
}


static void codenot (FuncState *fs, expdesc *e) {
  luaK_dischargevars(fs, e);
  switch (e->k) {
    case VNIL: case VFALSE: {
      e->k = VTRUE;
      break;
    }
    case VK: case VKNUM: case VTRUE: {
      e->k = VFALSE;
      break;
    }
    case VJMP: {
      invertjump(fs, e);
      break;
    }
    case VRELOCABLE:
    case VNONRELOC: {
      discharge2anyreg(fs, e);
      freeexp(fs, e);
      e->u.s.info = luaK_codeABC(fs, OP_NOT, 0, e->u.s.info, 0);
      e->k = VRELOCABLE;
      break;
    }
    default: {
      lua_assert(0);  /* cannot happen */
      break;
    }
  }
  /* interchange true and false lists */
  { int temp = e->f; e->f = e->t; e->t = temp; }
  removevalues(fs, e->f);
  removevalues(fs, e->t);
}


void luaK_indexed (FuncState *fs, expdesc *t, expdesc *k) {
  t->u.s.aux = luaK_exp2RK(fs, k);
  t->k = VINDEXED;
}


static int constfolding (OpCode op, expdesc *e1, expdesc *e2) {
  lua_Number v1, v2, r;
  if (!isnumeral(e1) || !isnumeral(e2)) return 0;
  v1 = e1->u.nval;
  v2 = e2->u.nval;
  switch (op) {
    case OP_ADD: r = luai_numadd(v1, v2); break;
    case OP_SUB: r = luai_numsub(v1, v2); break;
    case OP_MUL: r = luai_nummul(v1, v2); break;
    case OP_DIV:
      if (v2 == 0) return 0;  /* do not attempt to divide by 0 */
      r = luai_numdiv(v1, v2); break;
    case OP_MOD:
      if (v2 == 0) return 0;  /* do not attempt to divide by 0 */
      r = luai_nummod(v1, v2); break;
    case OP_POW: r = luai_numpow(v1, v2); break;
    case OP_UNM: r = luai_numunm(v1); break;
    case OP_LEN: return 0;  /* no constant folding for 'len' */
    default: lua_assert(0); r = 0; break;
  }
  if (luai_numisnan(r)) return 0;  /* do not attempt to produce NaN */
  e1->u.nval = r;
  return 1;
}


static void codearith (FuncState *fs, OpCode op, expdesc *e1, expdesc *e2) {
  if (constfolding(op, e1, e2))
    return;
  else {
    int o2 = (op != OP_UNM && op != OP_LEN) ? luaK_exp2RK(fs, e2) : 0;
    int o1 = luaK_exp2RK(fs, e1);
    if (o1 > o2) {
      freeexp(fs, e1);
      freeexp(fs, e2);
    }
    else {
      freeexp(fs, e2);
      freeexp(fs, e1);
    }
    e1->u.s.info = luaK_codeABC(fs, op, 0, o1, o2);
    e1->k = VRELOCABLE;
  }
}


static void codecomp (FuncState *fs, OpCode op, int cond, expdesc *e1,
                                                          expdesc *e2) {
  int o1 = luaK_exp2RK(fs, e1);
  int o2 = luaK_exp2RK(fs, e2);
  freeexp(fs, e2);
  freeexp(fs, e1);
  if (cond == 0 && op != OP_EQ) {
    int temp;  /* exchange args to replace by `<' or `<=' */
    temp = o1; o1 = o2; o2 = temp;  /* o1 <==> o2 */
    cond = 1;
  }
  e1->u.s.info = condjump(fs, op, cond, o1, o2);
  e1->k = VJMP;
}


void luaK_prefix (FuncState *fs, UnOpr op, expdesc *e) {
  expdesc e2;
  e2.t = e2.f = NO_JUMP; e2.k = VKNUM; e2.u.nval = 0;
  switch (op) {
    case OPR_MINUS: {
      if (!isnumeral(e))
        luaK_exp2anyreg(fs, e);  /* cannot operate on non-numeric constants */
      codearith(fs, OP_UNM, e, &e2);
      break;
    }
    case OPR_NOT: codenot(fs, e); break;
    case OPR_LEN: {
      luaK_exp2anyreg(fs, e);  /* cannot operate on constants */
      codearith(fs, OP_LEN, e, &e2);
      break;
    }
    default: lua_assert(0);
  }
}


void luaK_infix (FuncState *fs, BinOpr op, expdesc *v) {
  switch (op) {
    case OPR_AND: {
      luaK_goiftrue(fs, v);
      break;
    }
    case OPR_OR: {
      luaK_goiffalse(fs, v);
      break;
    }
    case OPR_CONCAT: {
      luaK_exp2nextreg(fs, v);  /* operand must be on the `stack' */
      break;
    }
    case OPR_ADD: case OPR_SUB: case OPR_MUL: case OPR_DIV:
    case OPR_MOD: case OPR_POW: {
      if (!isnumeral(v)) luaK_exp2RK(fs, v);
      break;
    }
    default: {
      luaK_exp2RK(fs, v);
      break;
    }
  }
}


void luaK_posfix (FuncState *fs, BinOpr op, expdesc *e1, expdesc *e2) {
  switch (op) {
    case OPR_AND: {
      lua_assert(e1->t == NO_JUMP);  /* list must be closed */
      luaK_dischargevars(fs, e2);
      luaK_concat(fs, &e2->f, e1->f);
      *e1 = *e2;
      break;
    }
    case OPR_OR: {
      lua_assert(e1->f == NO_JUMP);  /* list must be closed */
      luaK_dischargevars(fs, e2);
      luaK_concat(fs, &e2->t, e1->t);
      *e1 = *e2;
      break;
    }
    case OPR_CONCAT: {
      luaK_exp2val(fs, e2);
      if (e2->k == VRELOCABLE && GET_OPCODE(getcode(fs, e2)) == OP_CONCAT) {
        lua_assert(e1->u.s.info == GETARG_B(getcode(fs, e2))-1);
        freeexp(fs, e1);
        SETARG_B(getcode(fs, e2), e1->u.s.info);
        e1->k = VRELOCABLE; e1->u.s.info = e2->u.s.info;
      }
      else {
        luaK_exp2nextreg(fs, e2);  /* operand must be on the 'stack' */
        codearith(fs, OP_CONCAT, e1, e2);
      }
      break;
    }
    case OPR_ADD: codearith(fs, OP_ADD, e1, e2); break;
    case OPR_SUB: codearith(fs, OP_SUB, e1, e2); break;
    case OPR_MUL: codearith(fs, OP_MUL, e1, e2); break;
    case OPR_DIV: codearith(fs, OP_DIV, e1, e2); break;
    case OPR_MOD: codearith(fs, OP_MOD, e1, e2); break;
    case OPR_POW: codearith(fs, OP_POW, e1, e2); break;
    case OPR_EQ: codecomp(fs, OP_EQ, 1, e1, e2); break;
    case OPR_NE: codecomp(fs, OP_EQ, 0, e1, e2); break;
    case OPR_LT: codecomp(fs, OP_LT, 1, e1, e2); break;
    case OPR_LE: codecomp(fs, OP_LE, 1, e1, e2); break;
    case OPR_GT: codecomp(fs, OP_LT, 0, e1, e2); break;
    case OPR_GE: codecomp(fs, OP_LE, 0, e1, e2); break;
    default: lua_assert(0);
  }
}


void luaK_fixline (FuncState *fs, int line) {
  fs->f->lineinfo[fs->pc - 1] = line;
}


static int luaK_code (FuncState *fs, Instruction i, int line) {
  Proto *f = fs->f;
  dischargejpc(fs);  /* `pc' will change */
  /* put new instruction in code array */
  luaM_growvector(fs->L, f->code, fs->pc, f->sizecode, Instruction,
                  MAX_INT, "code size overflow");
  f->code[fs->pc] = i;
  /* save corresponding line information */
  luaM_growvector(fs->L, f->lineinfo, fs->pc, f->sizelineinfo, int,
                  MAX_INT, "code size overflow");
  f->lineinfo[fs->pc] = line;
  return fs->pc++;
}


int luaK_codeABC (FuncState *fs, OpCode o, int a, int b, int c) {
  lua_assert(getOpMode(o) == iABC);
  lua_assert(getBMode(o) != OpArgN || b == 0);
  lua_assert(getCMode(o) != OpArgN || c == 0);
  return luaK_code(fs, CREATE_ABC(o, a, b, c), fs->ls->lastline);
}


int luaK_codeABx (FuncState *fs, OpCode o, int a, unsigned int bc) {
  lua_assert(getOpMode(o) == iABx || getOpMode(o) == iAsBx);
  lua_assert(getCMode(o) == OpArgN);
  return luaK_code(fs, CREATE_ABx(o, a, bc), fs->ls->lastline);
}


void luaK_setlist (FuncState *fs, int base, int nelems, int tostore) {
  int c =  (nelems - 1)/LFIELDS_PER_FLUSH + 1;
  int b = (tostore == LUA_MULTRET) ? 0 : tostore;
  lua_assert(tostore != 0);
  if (c <= MAXARG_C)
    luaK_codeABC(fs, OP_SETLIST, base, b, c);
  else {
    luaK_codeABC(fs, OP_SETLIST, base, b, 0);
    luaK_code(fs, cast(Instruction, c), fs->ls->lastline);
  }
  fs->freereg = base + 1;  /* free registers with list values */
}
generated by cgit v1.2.3 (git 2.39.1) at 2025-02-21 21:17:21 +0000