@@ -109,14 +109,14 @@ }
     return circuit->components[cIdx].entries[entryPos].sizes;
 }
 
-PBigInt Circom_CalcWit::allocBigInts(Circom_Sizes sizes) {
-    PBigInt res = new BigInt[sizes[0]];
-    for (int i=0; i<sizes[0]; i++) mpz_init2(res[i], 256);
+PBigInt Circom_CalcWit::allocBigInts(int n) {
+    PBigInt res = new BigInt[n];
+    for (int i=0; i<n; i++) mpz_init2(res[i], 256);
     return res;
 }
 
-void Circom_CalcWit::freeBigInts(PBigInt bi, Circom_Sizes sizes) {
-    for (int i=0; i<sizes[0]; i++) mpz_clear(bi[i]);
+void Circom_CalcWit::freeBigInts(PBigInt bi, int n) {
+    for (int i=0; i<n; i++) mpz_clear(bi[i]);
     delete[] bi;
 }
 

@@ -35,8 +35,8 @@ Circom_Sizes getSubComponentSizes(int cIdx, u64 hash);
     int getSignalOffset(int cIdx, u64 hash);
     Circom_Sizes getSignalSizes(int cIdx, u64 hash);
 
-    PBigInt allocBigInts(Circom_Sizes sizes);
-    void freeBigInts(PBigInt bi, Circom_Sizes sizes);
+    PBigInt allocBigInts(int n);
+    void freeBigInts(PBigInt bi, int n);
 
     void getSignal(int cIdx, int sIdx, PBigInt value);
     void setSignal(int cIdx, int sIdx, PBigInt value);

@@ -6,7 +6,6 @@ mpz_init_set_ui(zero, 0);
     mpz_init_set_ui(one, 1);
 }
 
-
 void ZqField::add(PBigInt r, PBigInt a, PBigInt b) {
     mpz_add(*r,*a,*b);
     mpz_fdiv_r(*r, *r, p);
@@ -25,6 +24,6 @@ int ZqField::isTrue(PBigInt a) {
     return mpz_sgn(*a);
 }
 
-void ZqField::copy(PBigInt a, PBigInt b) {
-    return mpz_set(*a, *b);
+void ZqField::copyn(PBigInt a, PBigInt b, int n) {
+    for (int i=0;i<n; i++) mpz_set(a[i], b[i]);
 }

@@ -11,7 +11,7 @@ BigInt one;
     BigInt zero;
     ZqField(PBigInt ap);
 
-    void copy(PBigInt a, PBigInt b);
+    void copyn(PBigInt a, PBigInt b, int n);
     void add(PBigInt r,PBigInt a, PBigInt b);
     void lt(PBigInt r, PBigInt a, PBigInt b);
     int isTrue(PBigInt a);

@@ -27,6 +27,9 @@ module.exports =  buildC;
 
 
 function buildC(ctx) {
+    ctx.definedFunctions = {};
+    ctx.functionCodes = [];
+    ctx.buildFunction = buildFunction;
     ctx.code = "";
     ctx.conditionalCodeHeader = "";
     ctx.tmpNames = {};
@@ -36,7 +39,10 @@ ctx.definedSizes = {};
     ctx.addSizes = addSizes;
 
     const entryTables = buildEntryTables(ctx);
+    ctx.globalNames = ctx.tmpNames;
+
     const code = buildCode(ctx);
+    const functions = buildFuncFunctions(ctx);
     const compnentsArray = buildComponentsArray(ctx);
 
     const headder = buildHeader(ctx);
@@ -49,6 +55,7 @@ return "" +
         headder + "\n" +
         sizes + "\n" +
         entryTables + "\n" +
+        functions + "\n" +
         code + "\n" +
         compnentsArray + "\n" +
         mapIsInput + "\n" +
@@ -128,31 +135,10 @@ }
 }
 
 function buildCode(ctx) {
-    const globalNames = ctx.tmpNames;
 
     const fDefined = {};
 
-    const functions = [];
-    for (let f in ctx.functions) {
-        ctx.scope = {};
-        const paramsList = [];
-        for (let p in ctx.functions[f].params) {
-            const param = ctx.functions[f].params[p];
-            paramsList.push("POINTER "+param.name);
-
-            ctx.scope[param.name] = {
-                type: "LOCAL",
-                sels: param.sels,
-                getter: () => { return param.name; },
-            };
-        }
-
-        ctx.code += "void "+f+"(POINTER _ret, "+paramsList.join(",")+") {\n";
-
-        ctx.code += gen(ctx, ctx.functions[f].block);
-        ctx.code += "}";
-    }
-
+    const fnComponents = [];
     for (let i=0; i<ctx.components.length; i++) {
         const h = hashComponentCall(ctx, i);
         const fName = ctx.components[i].template+"_"+h;
@@ -162,11 +148,10 @@
             const scope = {_prefix : ""};
             ctx.scopes = [scope];
             ctx.conditionalCode = false;
-            ctx.nScopes = 0;
             ctx.code = "";
             ctx.codeHeader = "// Header\n";
             ctx.codeFooter = "// Footer\n";
-            ctx.tmpNames = Object.assign({},globalNames);
+            ctx.tmpNames = Object.assign({},ctx.globalNames);
 
             for (let p in ctx.components[i].params) {
                 newRef(ctx, "BIGINT", p, bigInt(ctx.components[i].params[p]));
@@ -182,12 +167,17 @@ ctx.codeFooter
                         ) +
                       "}\n";
 
-            functions.push(S);
+            fnComponents.push(S);
         }
         ctx.components[i].fnName = fName;
     }
 
-    return functions.join("\n");
+    return fnComponents.join("\n");
+}
+
+function buildFuncFunctions(ctx) {
+    return "// Functions\n" +
+        ctx.functionCodes.join("\n");
 }
 
 function buildComponentsArray(ctx) {
@@ -327,6 +317,7 @@ // TODO: At the moment generate a diferent function for each instance of the component
     return cIdx;
 }
 
+
 function getTmpName(_suggestedName) {
     let suggestedName;
     if (_suggestedName) {
@@ -381,3 +372,90 @@
     return labelName;
 }
 
+function buildFunction(name, paramValues) {
+    const ctx = this;
+    const h = hashFunctionCall(ctx, name, paramValues);
+
+    if (ctx.definedFunctions[h]) return ctx.definedFunctions[h];
+
+    const res = {
+        fnName: `${name}_${h}`
+    };
+
+    const oldScopes = ctx.scopes;
+    const oldConditionalCode = ctx.conditionalCode;
+    const oldCode = ctx.code;
+    const oldCodeHeader = ctx.codeHeader;
+    const oldCodeFooter = ctx.codeFooter;
+    const oldTmpNames = ctx.tmpNames;
+
+
+    const scope = {_prefix : ""};
+    ctx.scopes = [scope];
+    ctx.conditionalCode = false;
+    ctx.code = "";
+    ctx.codeHeader = "// Header\n";
+    ctx.codeFooter = "// Footer\n";
+    ctx.tmpNames = Object.assign({},ctx.globalNames);
+    ctx.returnValue = null;
+    ctx.returnSizes = null;
+
+    let paramsStr = "";
+
+    for (let i=0; i<ctx.functions[name].params.length; i++) {
+
+        if (paramValues[i].used) {
+            paramsStr += `,PBigInt ${ctx.functions[name].params[i]}`;
+            scope[ctx.functions[name].params[i]] = {
+                stack: true,
+                type: "BIGINT",
+                used: true,
+                sizes: paramValues[i].sizes,
+                label: ctx.functions[name].params[i],
+            };
+        } else {
+            scope[ctx.functions[name].params[i]] = {
+                stack: true,
+                type: "BIGINT",
+                used: false,
+                sizes: paramValues[i].sizes,
+                label: ctx.functions[name].params[i],
+                value: paramValues[i].value
+            };
+        }
+    }
+
+    gen(ctx, ctx.functions[name].block);
+
+    if (ctx.returnValue == null) {
+        if (ctx.returnSizes ==  null) assert(false, `Funciont ${name} does not return any value`);
+        res.type = "VARVAL_CONSTSIZE";
+        let code = `void ${name}_${h}(Circom_CalcWit *ctx, PBigInt __retValue ${paramsStr}) {`;
+        code += utils.ident(ctx.codeHeader);
+        code += utils.ident(ctx.code);
+        code += utils.ident("returnFunc:\n");
+        code += utils.ident(ctx.codeFooter);
+        code += "}\n";
+        res.returnSizes = ctx.returnSizes;
+        ctx.functionCodes.push(code);
+    } else {
+        res.type = "CONSTVAL";
+        res.returnValue = ctx.returnValue;
+    }
+
+    ctx.scopes = oldScopes;
+    ctx.conditionalCode = oldConditionalCode;
+    ctx.code = oldCode;
+    ctx.codeHeader = oldCodeHeader;
+    ctx.codeFooter = oldCodeFooter;
+    ctx.tmpNames = oldTmpNames;
+
+    ctx.definedFunctions[h] = res;
+
+    return res;
+}
+
+function hashFunctionCall(ctx, name, paramValues) {
+    // TODO
+    return "1234";
+}

@@ -5,10 +5,9 @@
 module.exports.gen =  gen;
 module.exports.newRef = newRef;
 
-function newRef(ctx, type, _name, value, _sizes) {
+function newRef(ctx, type, _name, value, sizes) {
     const isValue = ((typeof(value) != "undefined")&&(value != null));
     let name;
-    let sizes;
     if (!_name) {
         name = ctx.getTmpName();
     } else {
@@ -18,14 +17,12 @@ } else {
             name = _name;
         }
     }
-    if (typeof(_sizes) == "string") {
-        sizes = _sizes;
-    } else if (Array.isArray(_sizes)) {
-        sizes = newSizes(ctx, _sizes);
+    if (Array.isArray(sizes)) {
+        sizes = utils.accSizes(sizes);
     } else if (isValue) {
-        sizes = newSizes(ctx, utils.extractSizes(value));
+        sizes = utils.accSizes(utils.extractSizes(value));
     } else {
-        sizes = newSizes(ctx, []);
+        sizes = [1, 0];
     }
 
     const scope = ctx.scopes[ctx.scopes.length-1];
@@ -43,23 +40,6 @@
     if (isValue) {
         scope[name].value = value;
     }
-
-    return name;
-}
-
-function newSizes(ctx, sizes) {
-    const scope = ctx.scopes[ctx.scopes.length-1];
-
-    const name = ctx.getTmpName("_sz");
-
-    scope[name] = {
-        stack: true,
-        type: "SIZES",
-        used: false,
-        dim: sizes.length,
-        label: name,
-        value: sizes
-    };
 
     return name;
 }
@@ -71,27 +51,8 @@ if (!v.stack) return error(ctx, null, "Using a non existing var: " + name);
     if (v.used) return;
 
     if (v.type=="BIGINT") {
-
-        const iSize = getScope(ctx, v.sizes);
-
-        if (iSize.used) {
-            const labelSize = iSize.label;
-            ctx.codeHeader += `PBigInt ${v.label};\n`;
-            const c = `${v.label} = ctx->allocBigInts(${labelSize});\n`;
-            if (ctx.conditionalCode) {
-                ctx.conditionalCodeHeader += c;
-            } else {
-                ctx.code += c;
-            }
-            ctx.codeFooter += `ctx->freeBigInts(${v.label}, ${labelSize});\n`;
-        } else if (iSize.value) {
-            const labelSize = ctx.addSizes(iSize.value);
-            ctx.codeHeader += `PBigInt ${v.label} = ctx->allocBigInts(${labelSize});\n`;
-            ctx.codeFooter += `ctx->freeBigInts(${v.label}, ${labelSize});\n`;
-        } else {
-            return error(ctx, null, "Undefined Sizes: " +name);
-        }
-
+        ctx.codeHeader += `PBigInt ${v.label} = ctx->allocBigInts(${v.sizes[0]});\n`;
+        ctx.codeFooter += `ctx->freeBigInts(${v.label}, ${v.sizes[0]});\n`;
     } else if (v.type=="INT") {
         ctx.codeHeader += `int ${v.label};\n`;
     } else if (v.type=="SIZES") {
@@ -112,15 +73,15 @@ }
 }
 
 function instantiateConstant(ctx, value) {
-    const labelSize = ctx.addSizes(utils.extractSizes(value));
+    const sizes = utils.accSizes(utils.extractSizes(value));
     const flatedValue = utils.flatArray(value);
     const res = ctx.getTmpName("_const");
     ctx.codeHeader += `PBigInt ${res};\n`;
-    ctx.codeHeader += `${res} = ctx->allocBigInts(${labelSize});\n`;
+    ctx.codeHeader += `${res} = ctx->allocBigInts(${sizes[0]});\n`;
     for (let i=0; i<flatedValue.length; i++) {
         ctx.codeHeader += `mpz_set_str(${res}[${i}], "${flatedValue[i].toString(10)}", 10);\n`;
     }
-    ctx.codeFooter += `ctx->freeBigInts(${res}, ${labelSize});\n`;
+    ctx.codeFooter += `ctx->freeBigInts(${res}, ${sizes[0]});\n`;
     return res;
 }
 
@@ -339,40 +300,23 @@
     if (ast.name.type != "VARIABLE") return error(ctx, ast, "Invalid component name");
     if (typeof scope[varName] != "undefined") return error(ctx, ast, "Name already exists: "+varName);
 
-    const sizes=[];
-    let instantiate = false;
+    let sizes=[];
     for (let i=0; i< ast.name.selectors.length; i++) {
         const size = gen(ctx, ast.name.selectors[i]);
         if (ctx.error) return;
 
         if (size.used) {
-            instantiate = true;
-            sizes.push(`BigInt2Int(${scope[size].label})`);
+            return error(ctx, ast, "Variable size variables not allowed");
         } else {
             sizes.push(size.value.toJSNumber());
         }
-
-        sizes.push( size.value.toJSNumber() );
     }
-
-    const vSizes = newRef(ctx, "SIZES", "_sizes");
-    const iSizes = scope[vSizes];
-    iSizes.dim = ast.name.selectors.length;
-    if (instantiate) {
-        instantiateRef(ctx, vSizes);
-        ctx.code += `${iSizes.label}[${iSizes.dim+1}]=0`;
-        ctx.code += `${iSizes.label}[${iSizes.dim}]=1`;
-        for (let i=iSizes.dim-1; i>=0; i--) {
-            ctx.code += `${iSizes.label}[${i}] = ${sizes[i]}*${iSizes.label}[${i+1}];\n`;
-        }
-    } else {
-        iSizes.value = sizes;
-    }
+    sizes = utils.accSizes(sizes);
 
     const res = scope[varName] = {
         stack: true,
         type: "BIGINT",
-        sizes: vSizes,
+        sizes: sizes,
         label: labelName,
         used: false,
     };
@@ -405,7 +349,15 @@ }
 
     if ((sels)&&(sels.length>0)) {
 
-        const iSizes = getScope(ctx, vSizes);
+        let iSizes;
+        if (typeof vSizes == "string") {
+            iSizes = getScope(ctx, vSizes);
+        } else {
+            iSizes = {
+                used: false,
+                sizes: vSizes
+            };
+        }
 
         for (let i=0; i<sels.length; i++) {
             const vIdx = gen(ctx, sels[i]);
@@ -459,7 +411,6 @@
 function genVariable(ctx, ast) {
     const v = getScope(ctx, ast.name);
 
-
     if (v.type == "SIGNAL") {
         let vOffset;
         if (ast.selectors.length>0) {
@@ -476,13 +427,15 @@ const vOffset = genGetOffset(ctx, 0, v.sizes, ast.sels );
         const offset = getScope(ctx, vOffset);
         if (v.used) {
             if (offset.used) {
-                const res = newRef(ctx, "BIGINT", "_v");
-                instantiateRef(ctx, res);
-                ctx.code += `${res} = ${ast.name} + ${vOffset};\n`;
+                const res = newRef(ctx, "BIGINT", "_v", v.sizes.slice(ast.sels.length));
+                res.used = true;
+                ctx.codeHeader += `PBigInt ${res.label}`;
+                ctx.code += `${res} = ${ast.name} + ${vOffset.label};\n`;
                 return res;
             } else if (offset.value) {
-                const res = newRef(ctx, "BIGINT", "_v");
-                instantiateRef(ctx, res);
+                const res = newRef(ctx, "BIGINT", "_v", v.sizes.slice(ast.sels.length));
+                res.used = true;
+                ctx.codeHeader += `PBigInt ${res.label}`;
                 ctx.code += `${res} = ${ast.name} + ${vOffset.value};\n`;
                 return res;
             } else {
@@ -490,11 +443,11 @@ return ast.name;
             }
         } else {
             if (offset.used) {
-                instantiateRef(ctx, ast.name);
-                const vConstant = instantiateConstant(ctx, v.value);
-                const res = newRef(ctx, "BIGINT", "_v");
-                instantiateRef(ctx, res);
-                ctx.code += `${res} = ${vConstant} + ${vOffset};\n`;
+                instantiateRef(ctx, ast.name, v.value);
+                const res = newRef(ctx, "BIGINT", "_v", v.sizes.slice(ast.sels.length));
+                res.used = true;
+                ctx.codeHeader += `PBigInt ${res.label}`;
+                ctx.code += `${res} = ${ast.name} + ${vOffset.label};\n`;
                 return res;
             } else {
                 const sa = utils.subArray(v.value, ast.selectors);
@@ -672,22 +625,18 @@ }
 
         return genSetSignal(ctx, "ctx->cIdx", vsIdx, rName);
     } else if (left.type == "BIGINT") {
+        if (!utils.sameSizes(left.sizes, right.sizes)) return error(ctx, ast, "Sizes do not match");
         if (left.used) {
             if (!right.used) {
-                instantiateRef(ctx, rName);
+                instantiateRef(ctx, rName, right.value);
             }
-            ctx.code += `ctx->field->copy(${left.label}, ${right.label});\n`;
+            ctx.code += `ctx->field->copyn(${left.label}, ${right.label}, ${right.sizes[0]});\n`;
         } else {
             if (right.used) {
                 instantiateRef(ctx, lName);
-                ctx.code += `ctx->field->copy(${left.label}, ${right.label});\n`;
+                ctx.code += `ctx->field->copyn(${left.label}, ${right.label}, ${right.sizes[0]});\n`;
             } else {
-                if (ctx.conditionalCode) {
-                    instantiateRef(ctx, lName);
-                    ctx.code += `ctx->field->copy(${left.label}, ${right.label});\n`;
-                } else {
-                    left.value = right.value;
-                }
+                left.value = right.value;
             }
         }
     } else {
@@ -718,14 +667,29 @@ }
 
 
 function genFunctionCall(ctx, ast) {
-    let S = "[";
+    const params = [];
     for (let i=0; i<ast.params.length; i++) {
-        if (i>0) S += ",";
-        S += gen(ctx, ast.params[i]);
+        const pName = gen(ctx, ast.params[i]);
+        params.push(getScope(ctx, pName));
     }
-    S+="]";
+
+    const fn = ctx.buildFunction(ast.name, params);
+
+    if (fn.type == "VARVAL_CONSTSIZE") {
+        const res = newRef(ctx, "BIGINT", `_ret${ast.name}Sizes`, fn.retSizes);
+        instantiateRef(ctx, res);
+
+        ctx.code +=`${fn.fnName}(ctx, ${res}`;
+        for (let i=0; i<params.length; i++) {
+            if (params[i].used) ctx.code+=`,${params[i].label}`;
+        }
+        ctx.code+=");\n";
 
-    return `ctx.callFunction("${ast.name}", ${S})`;
+        return res;
+    } else {
+        const res = newRef(ctx, "BIGINT", "_retVal", fn.returnValue);
+        return res;
+    }
 }
 
 function enterConditionalCode(ctx) {
@@ -857,9 +821,26 @@ }
 
 
 function genReturn(ctx, ast) {
-    const value = gen(ctx, ast.value);
-    if (ctx.error) return;
-    return `return ${value};`;
+    const vName = gen(ctx, ast.value);
+    const v= getScope(ctx, vName);
+    if (ctx.returnSizes) {
+        if (!utils.sizesEqual(vName.sizes, ctx.returnSizes)) return error(ctx, ast, "Diferent return sizes");
+    } else {
+        ctx.returnSizes = v.sizes;
+    }
+    if (ctx.conditionalCode) {
+        instantiateRef(ctx, vName, vName.value);
+    }
+    if (v.used) {
+        ctx.code += `ctx->field->copyn(__retValue, ${vName}, ${v.sizes[0]});\n`;
+    } else {
+        if ((typeof v.value == "undefined") || v == null) return error(ctx, ast, "Returning an unknown value");
+        if ((typeof ctx.returnValue == "undefined") || (ctx.returnValue == null))  {
+            ctx.returnValue = v.value;
+        }
+    }
+    ctx.code += "goto returnFunc;\n";
+    return vName;
 }
 
 

@@ -11,6 +11,7 @@ module.exports.accSizes = accSizes;
 module.exports.fnvHash = fnvHash;
 module.exports.stringifyBigInts = stringifyBigInts;
 module.exports.unstringifyBigInts = unstringifyBigInts;
+module.exports.sameSizes = sameSizes;
 
 function ident(text) {
     let lines = text.split("\n");
@@ -103,6 +104,16 @@ return res;
     } else {
         return o;
     }
+}
+
+function sameSizes(s1, s2) {
+    if (!Array.isArray(s1)) return false;
+    if (!Array.isArray(s2)) return false;
+    if (s1.length != s2.length) return false;
+    for (let i=0; i<s1.length; i++) {
+        if (s1[i] != s2[i]) return false;
+    }
+    return true;
 }
 
 

@@ -19,6 +19,14 @@ }
 
 describe("basic cases", function () {
     this.timeout(100000);
+    it("inout", async () => {
+        await doTest(
+            "inout.circom",
+            [
+                [{in1: 1, in2: [2,3], in3:[[4,5], [6,7], [8,9]]}, {out1: 1, out2: [2,3], out3: [[4,5], [6,7],[8,9]]}],
+            ]
+        );
+    });
     it("add", async () => {
         await doTest(
             "add.circom",
@@ -56,6 +64,26 @@ "forrolled.circom",
             [
                 [{in: 0}, {out: 0}],
                 [{in: 10}, {out: 10}],
+            ]
+        );
+    });
+    it("function1", async () => {
+        await doTest(
+            "function1.circom",
+            [
+                [{in: 0}, {out: 3}],
+                [{in: 10}, {out: 13}],
+                [{in: __P__.minus(2)}, {out: 1}],
+            ]
+        );
+    });
+    it("function2", async () => {
+        await doTest(
+            "function2.circom",
+            [
+                [{in: 0}, {out: 3}],
+                [{in: 10}, {out: 13}],
+                [{in: __P__.minus(2)}, {out: 1}],
             ]
         );
     });

@@ -1,1 +0,0 @@
-{"in":[1,2]}

@@ -0,0 +1,12 @@
+function func1(a,b) {
+    return a+b;
+}
+
+template Main() {
+    signal input in;
+    signal output out;
+
+    out <== func1(in, 3);
+}
+
+component main = Main();

@@ -0,0 +1,13 @@
+function fnConst(a,b) {
+    return a+b;
+}
+
+template Main() {
+    signal input in;
+    signal output out;
+
+    var a = fnConst(1,2);
+    out <== in +a;
+}
+
+component main = Main();

@@ -1,5 +0,0 @@
-[
- "1"
-,"0"
-,"0"
-]

@@ -1,19 +0,0 @@
-const path = require("path");
-
-const c_tester = require("../index.js").c_tester;
-// const stringifyBigInts = require("snarkjs").stringifyBigInts;
-
-
-describe("inout test", function () {
-    this.timeout(100000);
-    it("Should compile a code with vars inside a for", async () => {
-        const cir = await c_tester(path.join(__dirname, "circuits", "inout.circom"));
-
-        const out = await cir.calculateWitness({in1: 1, in2: [2,3], in3:[[4,5], [6,7], [8,9]]});
-
-        // console.log(JSON.stringify(stringifyBigInts(out),null,1));
-        await cir.assertOut(out, {out1: 1, out2: [2,3], out3: [[4,5], [6,7],[8,9]]} );
-
-        await cir.release();
-    });
-});