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authorBenoit Giannangeli <benoit.giannangeli@boursorama.fr>2017-02-23 08:59:35 +0100
committerBenoit Giannangeli <benoit.giannangeli@boursorama.fr>2017-02-23 10:40:04 +0100
commit567e12ce3f1ef413afa510cb583d6ac8442a7a4a (patch)
treea1911e7291e917de549bbdd2dead60aa513af87f /src/lvm.js
parent7c459409b078e38da07e2570a77945fdc0f55c2c (diff)
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coroutines
Diffstat (limited to 'src/lvm.js')
-rw-r--r--src/lvm.js96
1 files changed, 78 insertions, 18 deletions
diff --git a/src/lvm.js b/src/lvm.js
index a31e0c7..15a11e4 100644
--- a/src/lvm.js
+++ b/src/lvm.js
@@ -22,6 +22,65 @@ const ltm = require('./ltm.js');
const ltable = require('./ltable.js');
const ldebug = require('./ldebug.js');
+/*
+** finish execution of an opcode interrupted by an yield
+*/
+const luaV_finishOp = function(L) {
+ let ci = L.ci;
+ let base = ci.u.l.base;
+ let inst = ci.u.l.savedpc[ci.pcOff - 1]; /* interrupted instruction */
+ let op = OC.OpCodes[inst.opcode];
+
+ switch (op) { /* finish its execution */
+ case "OP_ADD": case "OP_SUB": case "OP_MUL": case "OP_DIV": case "OP_IDIV":
+ case "OP_BAND": case "OP_BOR": case "OP_BXOR": case "OP_SHL": case "OP_SHR":
+ case "OP_MOD": case "OP_POW":
+ case "OP_UNM": case "OP_BNOT": case "OP_LEN":
+ case "OP_GETTABUP": case "OP_GETTABLE": case "OP_SELF": {
+ L.stack[base + inst.A] = L.stack[--L.top];
+ break;
+ }
+ case "OP_LE": case "OP_LT": case "OP_EQ": {
+ let res = !L.stack[L.top - 1].l_isfalse();
+ L.top--;
+ if (ci.callstatus & lstate.CIST_LEQ) { /* "<=" using "<" instead? */
+ assert(op === "OP_LE");
+ ci.callstatus ^= lstate.CIST_LEQ; /* clear mark */
+ res = res !== 1 ? 1 : 0; /* negate result */
+ }
+ assert(OC.OpCodes[ci.u.l.savedpc[ci.pcOff]] === "OP_JMP");
+ if (res !== inst.A) /* condition failed? */
+ ci.pcOff++; /* skip jump instruction */
+ break;
+ }
+ case "OP_CONCAT": {
+ let top = L.top - 1; /* top when 'luaT_trybinTM' was called */
+ let b = inst.B; /* first element to concatenate */
+ let total = top - 1 - (base + b); /* yet to concatenate */
+ L.stack[L.top - 2] = L.stack[top]; /* put TM result in proper position */
+ if (total > 1) { /* are there elements to concat? */
+ L.top = top - 1; /* top is one after last element (at top-2) */
+ luaV_concat(L, total); /* concat them (may yield again) */
+ }
+
+ /* move final result to final position */
+ L.stack[ci.u.l.base + inst.A] = L.stack[L.top - 1];
+ L.top = ci.top; /* restore top */
+ break;
+ }
+ case "OP_TFORCALL": {
+ assert(OC.OpCodes[ci.u.l.savedpc[ci.pcOff]] === "OP_TFORLOOP");
+ L.top = ci.top; /* correct top */
+ break;
+ }
+ case "OP_CALL": {
+ if (inst.C - 1 >= 0) /* nresults >= 0? */
+ L.top = ci.top; /* adjust results */
+ break;
+ }
+ }
+};
+
const RA = function(L, base, i) {
return base + i.A;
};
@@ -1013,28 +1072,29 @@ const luaV_finishset = function(L, t, key, val, slot, recur) {
}
-module.exports.RA = RA;
-module.exports.RB = RB;
-module.exports.RC = RC;
-module.exports.RKB = RKB;
-module.exports.RKC = RKC;
-module.exports.luaV_execute = luaV_execute;
module.exports.dojump = dojump;
module.exports.donextjump = donextjump;
-module.exports.luaV_lessequal = luaV_lessequal;
-module.exports.luaV_lessthan = luaV_lessthan;
-module.exports.luaV_equalobj = luaV_equalobj;
module.exports.forlimit = forlimit;
-module.exports.luaV_tointeger = luaV_tointeger;
-module.exports.tonumber = tonumber;
-module.exports.tointeger = tointeger;
-module.exports.LTnum = LTnum;
-module.exports.LEnum = LEnum;
+module.exports.gettable = gettable;
+module.exports.l_strcmp = l_strcmp;
module.exports.LEintfloat = LEintfloat;
+module.exports.LEnum = LEnum;
module.exports.LTintfloat = LTintfloat;
-module.exports.l_strcmp = l_strcmp;
-module.exports.luaV_objlen = luaV_objlen;
+module.exports.LTnum = LTnum;
+module.exports.luaV_concat = luaV_concat;
+module.exports.luaV_equalobj = luaV_equalobj;
+module.exports.luaV_execute = luaV_execute;
+module.exports.luaV_finishOp = luaV_finishOp;
module.exports.luaV_finishset = luaV_finishset;
-module.exports.gettable = gettable;
+module.exports.luaV_lessequal = luaV_lessequal;
+module.exports.luaV_lessthan = luaV_lessthan;
+module.exports.luaV_objlen = luaV_objlen;
+module.exports.luaV_tointeger = luaV_tointeger;
+module.exports.RA = RA;
+module.exports.RB = RB;
+module.exports.RC = RC;
+module.exports.RKB = RKB;
+module.exports.RKC = RKC;
module.exports.settable = settable;
-module.exports.luaV_concat = luaV_concat; \ No newline at end of file
+module.exports.tointeger = tointeger;
+module.exports.tonumber = tonumber; \ No newline at end of file