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-rw-r--r--src/lapi.js8
-rw-r--r--src/ldo.js27
-rw-r--r--src/lvm.js128
3 files changed, 29 insertions, 134 deletions
diff --git a/src/lapi.js b/src/lapi.js
index ceafa4a..4b5be04 100644
--- a/src/lapi.js
+++ b/src/lapi.js
@@ -151,13 +151,7 @@ const lua_settop = function(L, idx) {
assert(-(idx + 1) <= L.top - (func + 1), "invalid new top");
newtop = L.top + idx + 1; /* 'subtract' index (index is negative) */
}
- if (L.top < newtop) {
- while (L.top < newtop)
- L.stack[L.top++] = new TValue(CT.LUA_TNIL, null);
- } else {
- while (L.top > newtop)
- delete L.stack[--L.top];
- }
+ ldo.adjust_top(L, newtop);
};
const lua_pop = function(L, n) {
diff --git a/src/ldo.js b/src/ldo.js
index 0f7a2d3..5e3e30a 100644
--- a/src/ldo.js
+++ b/src/ldo.js
@@ -21,6 +21,16 @@ const lzio = require('./lzio.js');
const CT = defs.constant_types;
const TS = defs.thread_status;
+const adjust_top = function(L, newtop) {
+ if (L.top < newtop) {
+ while (L.top < newtop)
+ L.stack[L.top++] = new lobject.TValue(CT.LUA_TNIL, null);
+ } else {
+ while (L.top > newtop)
+ delete L.stack[--L.top];
+ }
+};
+
const seterrorobj = function(L, errcode, oldtop) {
let current_top = L.top;
@@ -159,13 +169,7 @@ const luaD_precall = function(L, off, nresults) {
ci.func = func;
ci.l_base = base;
ci.top = base + fsize;
- if (L.top < ci.top) {
- while (L.top < ci.top)
- L.stack[L.top++] = new lobject.TValue(CT.LUA_TNIL, null);
- } else {
- while (L.top > ci.top)
- delete L.stack[--L.top];
- }
+ adjust_top(L, ci.top);
ci.l_code = p.code;
ci.l_savedpc = 0;
ci.callstatus = lstate.CIST_LUA;
@@ -263,13 +267,7 @@ const luaD_hook = function(L, event, line) {
assert(!L.allowhook);
L.allowhook = 1;
ci.top = ci_top;
- if (L.top < top) {
- while (L.top < top)
- L.stack[L.top++] = new lobject.TValue(CT.LUA_TNIL, null);
- } else {
- while (L.top > top)
- delete L.stack[--L.top];
- }
+ adjust_top(L, top);
ci.callstatus &= ~lstate.CIST_HOOKED;
}
};
@@ -693,6 +691,7 @@ const luaD_protectedparser = function(L, z, name, mode) {
return status;
};
+module.exports.adjust_top = adjust_top;
module.exports.luaD_call = luaD_call;
module.exports.luaD_callnoyield = luaD_callnoyield;
module.exports.luaD_checkstack = luaD_checkstack;
diff --git a/src/lvm.js b/src/lvm.js
index 409f99f..29e646e 100644
--- a/src/lvm.js
+++ b/src/lvm.js
@@ -62,39 +62,17 @@ const luaV_finishOp = function(L) {
}
/* move final result to final position */
lobject.setobjs2s(L, ci.l_base + inst.A, L.top - 1);
- /* restore top */
- if (L.top < ci.top) {
- while (L.top < ci.top)
- L.stack[L.top++] = new lobject.TValue(CT.LUA_TNIL, null);
- } else {
- while (L.top > ci.top)
- delete L.stack[--L.top];
- }
+ ldo.adjust_top(L, ci.top); /* restore top */
break;
}
case OCi.OP_TFORCALL: {
assert(ci.l_code[ci.l_savedpc].opcode === OCi.OP_TFORLOOP);
- /* correct top */
- if (L.top < ci.top) {
- while (L.top < ci.top)
- L.stack[L.top++] = new lobject.TValue(CT.LUA_TNIL, null);
- } else {
- while (L.top > ci.top)
- delete L.stack[--L.top];
- }
+ ldo.adjust_top(L, ci.top); /* correct top */
break;
}
case OCi.OP_CALL: {
- if (inst.C - 1 >= 0) { /* nresults >= 0? */
- /* adjust results */
- if (L.top < ci.top) {
- while (L.top < ci.top)
- L.stack[L.top++] = new lobject.TValue(CT.LUA_TNIL, null);
- } else {
- while (L.top > ci.top)
- delete L.stack[--L.top];
- }
- }
+ if (inst.C - 1 >= 0) /* nresults >= 0? */
+ ldo.adjust_top(L, ci.top); /* adjust results */
break;
}
}
@@ -424,14 +402,7 @@ const luaV_execute = function(L) {
luaV_concat(L, c - b + 1);
let rb = base + b;
lobject.setobjs2s(L, ra, rb);
- /* restore top */
- if (L.top < ci.top) {
- while (L.top < ci.top)
- L.stack[L.top++] = new lobject.TValue(CT.LUA_TNIL, null);
- } else {
- while (L.top > ci.top)
- delete L.stack[--L.top];
- }
+ ldo.adjust_top(L, ci.top); /* restore top */
break;
}
case OCi.OP_JMP: {
@@ -480,27 +451,10 @@ const luaV_execute = function(L) {
case OCi.OP_CALL: {
let b = i.B;
let nresults = i.C - 1;
-
- if (b !== 0) {
- if (L.top < ra+b) {
- while (L.top < ra+b)
- L.stack[L.top++] = new lobject.TValue(CT.LUA_TNIL, null);
- } else {
- while (L.top > ra+b)
- delete L.stack[--L.top];
- }
- }
-
+ if (b !== 0) ldo.adjust_top(L, ra+b); /* else previous instruction set top */
if (ldo.luaD_precall(L, ra, nresults)) {
- if (nresults >= 0) {
- if (L.top < ci.top) {
- while (L.top < ci.top)
- L.stack[L.top++] = new lobject.TValue(CT.LUA_TNIL, null);
- } else {
- while (L.top > ci.top)
- delete L.stack[--L.top];
- }
- }
+ if (nresults >= 0)
+ ldo.adjust_top(L, ci.top); /* adjust results */
} else {
ci = L.ci;
continue newframe;
@@ -510,15 +464,7 @@ const luaV_execute = function(L) {
}
case OCi.OP_TAILCALL: {
let b = i.B;
- if (b !== 0) {
- if (L.top < ra+b) {
- while (L.top < ra+b)
- L.stack[L.top++] = new lobject.TValue(CT.LUA_TNIL, null);
- } else {
- while (L.top > ra+b)
- delete L.stack[--L.top];
- }
- } /* else previous instruction set top */
+ if (b !== 0) ldo.adjust_top(L, ra+b); /* else previous instruction set top */
if (ldo.luaD_precall(L, ra, LUA_MULTRET)) { // JS function
} else {
/* tail call: put called frame (n) in place of caller one (o) */
@@ -533,13 +479,7 @@ const luaV_execute = function(L) {
lobject.setobjs2s(L, ofuncOff + aux, nfuncOff + aux);
oci.l_base = ofuncOff + (nci.l_base - nfuncOff);
oci.top = ofuncOff + (L.top - nfuncOff);
- if (L.top < nci.top) {
- while (L.top < oci.top)
- L.stack[L.top++] = new lobject.TValue(CT.LUA_TNIL, null);
- } else {
- while (L.top > oci.top)
- delete L.stack[--L.top];
- }
+ ldo.adjust_top(L, oci.top); /* correct top */
oci.l_code = nci.l_code;
oci.l_savedpc = nci.l_savedpc;
oci.callstatus |= lstate.CIST_TAIL;
@@ -560,15 +500,7 @@ const luaV_execute = function(L) {
return; /* external invocation: return */
/* invocation via reentry: continue execution */
ci = L.ci;
- if (b) {
- if (L.top < ci.top) {
- while (L.top < ci.top)
- L.stack[L.top++] = new lobject.TValue(CT.LUA_TNIL, null);
- } else {
- while (L.top > ci.top)
- delete L.stack[--L.top];
- }
- }
+ if (b) ldo.adjust_top(L, ci.top);
assert(ci.callstatus & lstate.CIST_LUA);
assert(ci.l_code[ci.l_savedpc - 1].opcode === OCi.OP_CALL);
continue newframe;
@@ -628,22 +560,9 @@ const luaV_execute = function(L) {
lobject.setobjs2s(L, cb+2, ra+2);
lobject.setobjs2s(L, cb+1, ra+1);
lobject.setobjs2s(L, cb, ra);
- /* func. + 2 args (state and index) */
- if (L.top < cb + 3) {
- while (L.top < cb + 3)
- L.stack[L.top++] = new lobject.TValue(CT.LUA_TNIL, null);
- } else {
- while (L.top > cb + 3)
- delete L.stack[--L.top];
- }
+ ldo.adjust_top(L, cb+3); /* func. + 2 args (state and index) */
ldo.luaD_call(L, cb, i.C);
- if (L.top < ci.top) {
- while (L.top < ci.top)
- L.stack[L.top++] = new lobject.TValue(CT.LUA_TNIL, null);
- } else {
- while (L.top > ci.top)
- delete L.stack[--L.top];
- }
+ ldo.adjust_top(L, ci.top);
/* go straight to OP_TFORLOOP */
i = ci.l_code[ci.l_savedpc++];
ra = RA(L, base, i);
@@ -674,15 +593,7 @@ const luaV_execute = function(L) {
for (; n > 0; n--) {
ltable.luaH_setint(h, last--, L.stack[ra + n]);
}
-
- /* correct top (in case of previous open call) */
- if (L.top < ci.top) {
- while (L.top < ci.top)
- L.stack[L.top++] = new lobject.TValue(CT.LUA_TNIL, null);
- } else {
- while (L.top > ci.top)
- delete L.stack[--L.top];
- }
+ ldo.adjust_top(L, ci.top); /* correct top (in case of previous open call) */
break;
}
case OCi.OP_CLOSURE: {
@@ -705,16 +616,7 @@ const luaV_execute = function(L) {
if (b < 0) {
b = n; /* get all var. arguments */
ldo.luaD_checkstack(L, n);
- if (L.top >= ra+n) {
- while (L.top > ra+n)
- delete L.stack[--L.top];
- } else {
- while (L.top < ra+n) {
- L.stack[L.top] = new lobject.TValue();
- L.top++;
- }
- }
- assert(L.top == ra + n);
+ ldo.adjust_top(L, ra + n);
}
for (j = 0; j < b && j < n; j++)
generated by cgit v1.2.3-70-g09d2 (git 2.47.0) at 2024-11-11 01:46:43 +0000