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Pass position information to primop calls

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For example:

  error: `tail' called on an empty list, at
    /home/eelco/Dev/nixpkgs/pkgs/applications/misc/hello/ex-2/default.nix:13:7
This commit is contained in:
Eelco Dolstra 2014-04-04 18:51:01 +02:00
parent 8b31ffd10d
commit c28de6d96e
5 changed files with 105 additions and 105 deletions
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2
corepkgs/derivation.nix
View file

@ -1,7 +1,7 @@
/* This is the implementation of the ‘derivation’ builtin function. /* This is the implementation of the ‘derivation’ builtin function.
It's actually a wrapper around the ‘derivationStrict’ primop. */ It's actually a wrapper around the ‘derivationStrict’ primop. */
drvAttrs @ { outputs ? [ "out" ], ... }: drvAttrs @ { outputs ? [ "out" ], name, builder, system, ... }:
let let

6
src/libexpr/eval.cc
View file

@ -794,7 +794,7 @@ void ExprApp::eval(EvalState & state, Env & env, Value & v)
} }
void EvalState::callPrimOp(Value & fun, Value & arg, Value & v) void EvalState::callPrimOp(Value & fun, Value & arg, Value & v, const Pos & pos)
{ {
/* Figure out the number of arguments still needed. */ /* Figure out the number of arguments still needed. */
unsigned int argsDone = 0; unsigned int argsDone = 0;
@ -820,7 +820,7 @@ void EvalState::callPrimOp(Value & fun, Value & arg, Value & v)
/* And call the primop. */ /* And call the primop. */
nrPrimOpCalls++; nrPrimOpCalls++;
if (countCalls) primOpCalls[primOp->primOp->name]++; if (countCalls) primOpCalls[primOp->primOp->name]++;
primOp->primOp->fun(*this, vArgs, v); primOp->primOp->fun(*this, pos, vArgs, v);
} else { } else {
Value * fun2 = allocValue(); Value * fun2 = allocValue();
*fun2 = fun; *fun2 = fun;
@ -834,7 +834,7 @@ void EvalState::callPrimOp(Value & fun, Value & arg, Value & v)
void EvalState::callFunction(Value & fun, Value & arg, Value & v, const Pos & pos) void EvalState::callFunction(Value & fun, Value & arg, Value & v, const Pos & pos)
{ {
if (fun.type == tPrimOp || fun.type == tPrimOpApp) { if (fun.type == tPrimOp || fun.type == tPrimOpApp) {
callPrimOp(fun, arg, v); callPrimOp(fun, arg, v, pos);
return; return;
} }

6
src/libexpr/eval.hh
View file

@ -36,7 +36,7 @@ public:
}; };
typedef void (* PrimOpFun) (EvalState & state, Value * * args, Value & v); typedef void (* PrimOpFun) (EvalState & state, const Pos & pos, Value * * args, Value & v);
struct PrimOp struct PrimOp
@ -227,7 +227,7 @@ public:
bool eqValues(Value & v1, Value & v2); bool eqValues(Value & v1, Value & v2);
void callFunction(Value & fun, Value & arg, Value & v, const Pos & pos); void callFunction(Value & fun, Value & arg, Value & v, const Pos & pos);
void callPrimOp(Value & fun, Value & arg, Value & v); void callPrimOp(Value & fun, Value & arg, Value & v, const Pos & pos);
/* Automatically call a function for which each argument has a /* Automatically call a function for which each argument has a
default value or has a binding in the `args' map. */ default value or has a binding in the `args' map. */
@ -278,7 +278,7 @@ private:
friend struct ExprOpUpdate; friend struct ExprOpUpdate;
friend struct ExprOpConcatLists; friend struct ExprOpConcatLists;
friend struct ExprSelect; friend struct ExprSelect;
friend void prim_getAttr(EvalState & state, Value * * args, Value & v); friend void prim_getAttr(EvalState & state, const Pos & pos, Value * * args, Value & v);
}; };

16
src/libexpr/parser.y
View file

@ -328,13 +328,13 @@ expr_if
expr_op expr_op
: '!' expr_op %prec NOT { $$ = new ExprOpNot($2); } : '!' expr_op %prec NOT { $$ = new ExprOpNot($2); }
| '-' expr_op %prec NEGATE { $$ = new ExprApp(new ExprApp(new ExprBuiltin(data->symbols.create("sub")), new ExprInt(0)), $2); } | '-' expr_op %prec NEGATE { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprBuiltin(data->symbols.create("sub")), new ExprInt(0)), $2); }
| expr_op EQ expr_op { $$ = new ExprOpEq($1, $3); } | expr_op EQ expr_op { $$ = new ExprOpEq($1, $3); }
| expr_op NEQ expr_op { $$ = new ExprOpNEq($1, $3); } | expr_op NEQ expr_op { $$ = new ExprOpNEq($1, $3); }
| expr_op '<' expr_op { $$ = new ExprApp(new ExprApp(new ExprBuiltin(data->symbols.create("lessThan")), $1), $3); } | expr_op '<' expr_op { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprBuiltin(data->symbols.create("lessThan")), $1), $3); }
| expr_op LEQ expr_op { $$ = new ExprOpNot(new ExprApp(new ExprApp(new ExprBuiltin(data->symbols.create("lessThan")), $3), $1)); } | expr_op LEQ expr_op { $$ = new ExprOpNot(new ExprApp(CUR_POS, new ExprApp(new ExprBuiltin(data->symbols.create("lessThan")), $3), $1)); }
| expr_op '>' expr_op { $$ = new ExprApp(new ExprApp(new ExprBuiltin(data->symbols.create("lessThan")), $3), $1); } | expr_op '>' expr_op { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprBuiltin(data->symbols.create("lessThan")), $3), $1); }
| expr_op GEQ expr_op { $$ = new ExprOpNot(new ExprApp(new ExprApp(new ExprBuiltin(data->symbols.create("lessThan")), $1), $3)); } | expr_op GEQ expr_op { $$ = new ExprOpNot(new ExprApp(CUR_POS, new ExprApp(new ExprBuiltin(data->symbols.create("lessThan")), $1), $3)); }
| expr_op AND expr_op { $$ = new ExprOpAnd($1, $3); } | expr_op AND expr_op { $$ = new ExprOpAnd($1, $3); }
| expr_op OR expr_op { $$ = new ExprOpOr($1, $3); } | expr_op OR expr_op { $$ = new ExprOpOr($1, $3); }
| expr_op IMPL expr_op { $$ = new ExprOpImpl($1, $3); } | expr_op IMPL expr_op { $$ = new ExprOpImpl($1, $3); }
@ -346,9 +346,9 @@ expr_op
l->push_back($3); l->push_back($3);
$$ = new ExprConcatStrings(false, l); $$ = new ExprConcatStrings(false, l);
} }
| expr_op '-' expr_op { $$ = new ExprApp(new ExprApp(new ExprBuiltin(data->symbols.create("sub")), $1), $3); } | expr_op '-' expr_op { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprBuiltin(data->symbols.create("sub")), $1), $3); }
| expr_op '*' expr_op { $$ = new ExprApp(new ExprApp(new ExprBuiltin(data->symbols.create("mul")), $1), $3); } | expr_op '*' expr_op { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprBuiltin(data->symbols.create("mul")), $1), $3); }
| expr_op '/' expr_op { $$ = new ExprApp(new ExprApp(new ExprBuiltin(data->symbols.create("div")), $1), $3); } | expr_op '/' expr_op { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprBuiltin(data->symbols.create("div")), $1), $3); }
| expr_op CONCAT expr_op { $$ = new ExprOpConcatLists($1, $3); } | expr_op CONCAT expr_op { $$ = new ExprOpConcatLists($1, $3); }
| expr_app | expr_app
; ;

180
src/libexpr/primops.cc
View file

@ -39,7 +39,7 @@ std::pair<string, string> decodeContext(const string & s)
/* Load and evaluate an expression from path specified by the /* Load and evaluate an expression from path specified by the
argument. */ argument. */
static void prim_import(EvalState & state, Value * * args, Value & v) static void prim_import(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
Path path = state.coerceToPath(*args[0], context); Path path = state.coerceToPath(*args[0], context);
@ -48,8 +48,8 @@ static void prim_import(EvalState & state, Value * * args, Value & v)
Path ctx = decodeContext(*i).first; Path ctx = decodeContext(*i).first;
assert(isStorePath(ctx)); assert(isStorePath(ctx));
if (!store->isValidPath(ctx)) if (!store->isValidPath(ctx))
throw EvalError(format("cannot import `%1%', since path `%2%' is not valid") throw EvalError(format("cannot import `%1%', since path `%2%' is not valid, at %3%")
% path % ctx); % path % ctx % pos);
if (isDerivation(ctx)) if (isDerivation(ctx))
try { try {
/* For performance, prefetch all substitute info. */ /* For performance, prefetch all substitute info. */
@ -94,7 +94,7 @@ static void prim_import(EvalState & state, Value * * args, Value & v)
/* Return a string representing the type of the expression. */ /* Return a string representing the type of the expression. */
static void prim_typeOf(EvalState & state, Value * * args, Value & v) static void prim_typeOf(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceValue(*args[0]); state.forceValue(*args[0]);
string t; string t;
@ -118,7 +118,7 @@ static void prim_typeOf(EvalState & state, Value * * args, Value & v)
/* Determine whether the argument is the null value. */ /* Determine whether the argument is the null value. */
static void prim_isNull(EvalState & state, Value * * args, Value & v) static void prim_isNull(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceValue(*args[0]); state.forceValue(*args[0]);
mkBool(v, args[0]->type == tNull); mkBool(v, args[0]->type == tNull);
@ -126,7 +126,7 @@ static void prim_isNull(EvalState & state, Value * * args, Value & v)
/* Determine whether the argument is a function. */ /* Determine whether the argument is a function. */
static void prim_isFunction(EvalState & state, Value * * args, Value & v) static void prim_isFunction(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceValue(*args[0]); state.forceValue(*args[0]);
mkBool(v, args[0]->type == tLambda); mkBool(v, args[0]->type == tLambda);
@ -134,7 +134,7 @@ static void prim_isFunction(EvalState & state, Value * * args, Value & v)
/* Determine whether the argument is an integer. */ /* Determine whether the argument is an integer. */
static void prim_isInt(EvalState & state, Value * * args, Value & v) static void prim_isInt(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceValue(*args[0]); state.forceValue(*args[0]);
mkBool(v, args[0]->type == tInt); mkBool(v, args[0]->type == tInt);
@ -142,7 +142,7 @@ static void prim_isInt(EvalState & state, Value * * args, Value & v)
/* Determine whether the argument is a string. */ /* Determine whether the argument is a string. */
static void prim_isString(EvalState & state, Value * * args, Value & v) static void prim_isString(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceValue(*args[0]); state.forceValue(*args[0]);
mkBool(v, args[0]->type == tString); mkBool(v, args[0]->type == tString);
@ -150,7 +150,7 @@ static void prim_isString(EvalState & state, Value * * args, Value & v)
/* Determine whether the argument is a Boolean. */ /* Determine whether the argument is a Boolean. */
static void prim_isBool(EvalState & state, Value * * args, Value & v) static void prim_isBool(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceValue(*args[0]); state.forceValue(*args[0]);
mkBool(v, args[0]->type == tBool); mkBool(v, args[0]->type == tBool);
@ -184,7 +184,7 @@ typedef list<Value *> ValueList;
#endif #endif
static void prim_genericClosure(EvalState & state, Value * * args, Value & v) static void prim_genericClosure(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
startNest(nest, lvlDebug, "finding dependencies"); startNest(nest, lvlDebug, "finding dependencies");
@ -194,7 +194,7 @@ static void prim_genericClosure(EvalState & state, Value * * args, Value & v)
Bindings::iterator startSet = Bindings::iterator startSet =
args[0]->attrs->find(state.symbols.create("startSet")); args[0]->attrs->find(state.symbols.create("startSet"));
if (startSet == args[0]->attrs->end()) if (startSet == args[0]->attrs->end())
throw EvalError("attribute `startSet' required"); throw EvalError(format("attribute `startSet' required, at %1%") % pos);
state.forceList(*startSet->value); state.forceList(*startSet->value);
ValueList workSet; ValueList workSet;
@ -205,7 +205,7 @@ static void prim_genericClosure(EvalState & state, Value * * args, Value & v)
Bindings::iterator op = Bindings::iterator op =
args[0]->attrs->find(state.symbols.create("operator")); args[0]->attrs->find(state.symbols.create("operator"));
if (op == args[0]->attrs->end()) if (op == args[0]->attrs->end())
throw EvalError("attribute `operator' required"); throw EvalError(format("attribute `operator' required, at %1%") % pos);
state.forceValue(*op->value); state.forceValue(*op->value);
/* Construct the closure by applying the operator to element of /* Construct the closure by applying the operator to element of
@ -224,7 +224,7 @@ static void prim_genericClosure(EvalState & state, Value * * args, Value & v)
Bindings::iterator key = Bindings::iterator key =
e->attrs->find(state.symbols.create("key")); e->attrs->find(state.symbols.create("key"));
if (key == e->attrs->end()) if (key == e->attrs->end())
throw EvalError("attribute `key' required"); throw EvalError(format("attribute `key' required, at %1%") % pos);
state.forceValue(*key->value); state.forceValue(*key->value);
if (doneKeys.find(key->value) != doneKeys.end()) continue; if (doneKeys.find(key->value) != doneKeys.end()) continue;
@ -251,7 +251,7 @@ static void prim_genericClosure(EvalState & state, Value * * args, Value & v)
} }
static void prim_abort(EvalState & state, Value * * args, Value & v) static void prim_abort(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
throw Abort(format("evaluation aborted with the following error message: `%1%'") % throw Abort(format("evaluation aborted with the following error message: `%1%'") %
@ -259,14 +259,14 @@ static void prim_abort(EvalState & state, Value * * args, Value & v)
} }
static void prim_throw(EvalState & state, Value * * args, Value & v) static void prim_throw(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
throw ThrownError(format("%1%") % state.coerceToString(*args[0], context)); throw ThrownError(format("%1%") % state.coerceToString(*args[0], context));
} }
static void prim_addErrorContext(EvalState & state, Value * * args, Value & v) static void prim_addErrorContext(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
try { try {
state.forceValue(*args[1]); state.forceValue(*args[1]);
@ -281,7 +281,7 @@ static void prim_addErrorContext(EvalState & state, Value * * args, Value & v)
/* Try evaluating the argument. Success => {success=true; value=something;}, /* Try evaluating the argument. Success => {success=true; value=something;},
* else => {success=false; value=false;} */ * else => {success=false; value=false;} */
static void prim_tryEval(EvalState & state, Value * * args, Value & v) static void prim_tryEval(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.mkAttrs(v, 2); state.mkAttrs(v, 2);
try { try {
@ -297,7 +297,7 @@ static void prim_tryEval(EvalState & state, Value * * args, Value & v)
/* Return an environment variable. Use with care. */ /* Return an environment variable. Use with care. */
static void prim_getEnv(EvalState & state, Value * * args, Value & v) static void prim_getEnv(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
string name = state.forceStringNoCtx(*args[0]); string name = state.forceStringNoCtx(*args[0]);
mkString(v, getEnv(name)); mkString(v, getEnv(name));
@ -306,7 +306,7 @@ static void prim_getEnv(EvalState & state, Value * * args, Value & v)
/* Evaluate the first expression and print it on standard error. Then /* Evaluate the first expression and print it on standard error. Then
return the second expression. Useful for debugging. */ return the second expression. Useful for debugging. */
static void prim_trace(EvalState & state, Value * * args, Value & v) static void prim_trace(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceValue(*args[0]); state.forceValue(*args[0]);
if (args[0]->type == tString) if (args[0]->type == tString)
@ -330,7 +330,7 @@ static void prim_trace(EvalState & state, Value * * args, Value & v)
derivation; `drvPath' containing the path of the Nix expression; derivation; `drvPath' containing the path of the Nix expression;
and `type' set to `derivation' to indicate that this is a and `type' set to `derivation' to indicate that this is a
derivation. */ derivation. */
static void prim_derivationStrict(EvalState & state, Value * * args, Value & v) static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
startNest(nest, lvlVomit, "evaluating derivation"); startNest(nest, lvlVomit, "evaluating derivation");
@ -339,7 +339,7 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v)
/* Figure out the name first (for stack backtraces). */ /* Figure out the name first (for stack backtraces). */
Bindings::iterator attr = args[0]->attrs->find(state.sName); Bindings::iterator attr = args[0]->attrs->find(state.sName);
if (attr == args[0]->attrs->end()) if (attr == args[0]->attrs->end())
throw EvalError("required attribute `name' missing"); throw EvalError(format("required attribute `name' missing, at %1%") % pos);
string drvName; string drvName;
Pos & posDrvName(*attr->pos); Pos & posDrvName(*attr->pos);
try { try {
@ -404,25 +404,25 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v)
else if (key == "outputHashMode") { else if (key == "outputHashMode") {
if (s == "recursive") outputHashRecursive = true; if (s == "recursive") outputHashRecursive = true;
else if (s == "flat") outputHashRecursive = false; else if (s == "flat") outputHashRecursive = false;
else throw EvalError(format("invalid value `%1%' for `outputHashMode' attribute") % s); else throw EvalError(format("invalid value `%1%' for `outputHashMode' attribute, at %2%") % s % posDrvName);
} }
else if (key == "outputs") { else if (key == "outputs") {
Strings tmp = tokenizeString<Strings>(s); Strings tmp = tokenizeString<Strings>(s);
outputs.clear(); outputs.clear();
foreach (Strings::iterator, j, tmp) { foreach (Strings::iterator, j, tmp) {
if (outputs.find(*j) != outputs.end()) if (outputs.find(*j) != outputs.end())
throw EvalError(format("duplicate derivation output `%1%'") % *j); throw EvalError(format("duplicate derivation output `%1%', at %2%") % *j % posDrvName);
/* !!! Check whether *j is a valid attribute /* !!! Check whether *j is a valid attribute
name. */ name. */
/* Derivations cannot be named ‘drv’, because /* Derivations cannot be named ‘drv’, because
then we'd have an attribute ‘drvPath’ in then we'd have an attribute ‘drvPath’ in
the resulting set. */ the resulting set. */
if (*j == "drv") if (*j == "drv")
throw EvalError(format("invalid derivation output name `drv'") % *j); throw EvalError(format("invalid derivation output name `drv', at %1%") % posDrvName);
outputs.insert(*j); outputs.insert(*j);
} }
if (outputs.empty()) if (outputs.empty())
throw EvalError("derivation cannot have an empty set of outputs"); throw EvalError(format("derivation cannot have an empty set of outputs, at %1%") % posDrvName);
} }
} }
@ -478,24 +478,24 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v)
/* Do we have all required attributes? */ /* Do we have all required attributes? */
if (drv.builder == "") if (drv.builder == "")
throw EvalError("required attribute `builder' missing"); throw EvalError(format("required attribute `builder' missing, at %1%") % posDrvName);
if (drv.platform == "") if (drv.platform == "")
throw EvalError("required attribute `system' missing"); throw EvalError(format("required attribute `system' missing, at %1%") % posDrvName);
/* Check whether the derivation name is valid. */ /* Check whether the derivation name is valid. */
checkStoreName(drvName); checkStoreName(drvName);
if (isDerivation(drvName)) if (isDerivation(drvName))
throw EvalError(format("derivation names are not allowed to end in `%1%'") throw EvalError(format("derivation names are not allowed to end in `%1%', at %2%")
% drvExtension); % drvExtension % posDrvName);
if (outputHash != "") { if (outputHash != "") {
/* Handle fixed-output derivations. */ /* Handle fixed-output derivations. */
if (outputs.size() != 1 || *(outputs.begin()) != "out") if (outputs.size() != 1 || *(outputs.begin()) != "out")
throw Error("multiple outputs are not supported in fixed-output derivations"); throw Error(format("multiple outputs are not supported in fixed-output derivations, at %1%") % posDrvName);
HashType ht = parseHashType(outputHashAlgo); HashType ht = parseHashType(outputHashAlgo);
if (ht == htUnknown) if (ht == htUnknown)
throw EvalError(format("unknown hash algorithm `%1%'") % outputHashAlgo); throw EvalError(format("unknown hash algorithm `%1%', at %2%") % outputHashAlgo % posDrvName);
Hash h = parseHash16or32(ht, outputHash); Hash h = parseHash16or32(ht, outputHash);
outputHash = printHash(h); outputHash = printHash(h);
if (outputHashRecursive) outputHashAlgo = "r:" + outputHashAlgo; if (outputHashRecursive) outputHashAlgo = "r:" + outputHashAlgo;
@ -555,7 +555,7 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v)
/* Convert the argument to a path. !!! obsolete? */ /* Convert the argument to a path. !!! obsolete? */
static void prim_toPath(EvalState & state, Value * * args, Value & v) static void prim_toPath(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
Path path = state.coerceToPath(*args[0], context); Path path = state.coerceToPath(*args[0], context);
@ -571,7 +571,7 @@ static void prim_toPath(EvalState & state, Value * * args, Value & v)
/nix/store/newhash-oldhash-oldname. In the past, `toPath' had /nix/store/newhash-oldhash-oldname. In the past, `toPath' had
special case behaviour for store paths, but that created weird special case behaviour for store paths, but that created weird
corner cases. */ corner cases. */
static void prim_storePath(EvalState & state, Value * * args, Value & v) static void prim_storePath(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
Path path = state.coerceToPath(*args[0], context); Path path = state.coerceToPath(*args[0], context);
@ -580,7 +580,7 @@ static void prim_storePath(EvalState & state, Value * * args, Value & v)
e.g. nix-push does the right thing. */ e.g. nix-push does the right thing. */
if (!isStorePath(path)) path = canonPath(path, true); if (!isStorePath(path)) path = canonPath(path, true);
if (!isInStore(path)) if (!isInStore(path))
throw EvalError(format("path `%1%' is not in the Nix store") % path); throw EvalError(format("path `%1%' is not in the Nix store, at %2%") % path % pos);
Path path2 = toStorePath(path); Path path2 = toStorePath(path);
if (!settings.readOnlyMode) if (!settings.readOnlyMode)
store->ensurePath(path2); store->ensurePath(path2);
@ -589,19 +589,19 @@ static void prim_storePath(EvalState & state, Value * * args, Value & v)
} }
static void prim_pathExists(EvalState & state, Value * * args, Value & v) static void prim_pathExists(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
Path path = state.coerceToPath(*args[0], context); Path path = state.coerceToPath(*args[0], context);
if (!context.empty()) if (!context.empty())
throw EvalError(format("string `%1%' cannot refer to other paths") % path); throw EvalError(format("string `%1%' cannot refer to other paths, at %2%") % path % pos);
mkBool(v, pathExists(path)); mkBool(v, pathExists(path));
} }
/* Return the base name of the given string, i.e., everything /* Return the base name of the given string, i.e., everything
following the last slash. */ following the last slash. */
static void prim_baseNameOf(EvalState & state, Value * * args, Value & v) static void prim_baseNameOf(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
mkString(v, baseNameOf(state.coerceToString(*args[0], context)), context); mkString(v, baseNameOf(state.coerceToString(*args[0], context)), context);
@ -611,7 +611,7 @@ static void prim_baseNameOf(EvalState & state, Value * * args, Value & v)
/* Return the directory of the given path, i.e., everything before the /* Return the directory of the given path, i.e., everything before the
last slash. Return either a path or a string depending on the type last slash. Return either a path or a string depending on the type
of the argument. */ of the argument. */
static void prim_dirOf(EvalState & state, Value * * args, Value & v) static void prim_dirOf(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
Path dir = dirOf(state.coerceToPath(*args[0], context)); Path dir = dirOf(state.coerceToPath(*args[0], context));
@ -620,12 +620,12 @@ static void prim_dirOf(EvalState & state, Value * * args, Value & v)
/* Return the contents of a file as a string. */ /* Return the contents of a file as a string. */
static void prim_readFile(EvalState & state, Value * * args, Value & v) static void prim_readFile(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
Path path = state.coerceToPath(*args[0], context); Path path = state.coerceToPath(*args[0], context);
if (!context.empty()) if (!context.empty())
throw EvalError(format("string `%1%' cannot refer to other paths") % path); throw EvalError(format("string `%1%' cannot refer to other paths, at %2%") % path % pos);
mkString(v, readFile(path).c_str()); mkString(v, readFile(path).c_str());
} }
@ -638,7 +638,7 @@ static void prim_readFile(EvalState & state, Value * * args, Value & v)
/* Convert the argument (which can be any Nix expression) to an XML /* Convert the argument (which can be any Nix expression) to an XML
representation returned in a string. Not all Nix expressions can representation returned in a string. Not all Nix expressions can
be sensibly or completely represented (e.g., functions). */ be sensibly or completely represented (e.g., functions). */
static void prim_toXML(EvalState & state, Value * * args, Value & v) static void prim_toXML(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
std::ostringstream out; std::ostringstream out;
PathSet context; PathSet context;
@ -650,7 +650,7 @@ static void prim_toXML(EvalState & state, Value * * args, Value & v)
/* Convert the argument (which can be any Nix expression) to a JSON /* Convert the argument (which can be any Nix expression) to a JSON
string. Not all Nix expressions can be sensibly or completely string. Not all Nix expressions can be sensibly or completely
represented (e.g., functions). */ represented (e.g., functions). */
static void prim_toJSON(EvalState & state, Value * * args, Value & v) static void prim_toJSON(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
std::ostringstream out; std::ostringstream out;
PathSet context; PathSet context;
@ -661,7 +661,7 @@ static void prim_toJSON(EvalState & state, Value * * args, Value & v)
/* Store a string in the Nix store as a source file that can be used /* Store a string in the Nix store as a source file that can be used
as an input by derivations. */ as an input by derivations. */
static void prim_toFile(EvalState & state, Value * * args, Value & v) static void prim_toFile(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
string name = state.forceStringNoCtx(*args[0]); string name = state.forceStringNoCtx(*args[0]);
@ -673,7 +673,7 @@ static void prim_toFile(EvalState & state, Value * * args, Value & v)
Path path = *i; Path path = *i;
if (path.at(0) == '=') path = string(path, 1); if (path.at(0) == '=') path = string(path, 1);
if (isDerivation(path)) if (isDerivation(path))
throw EvalError(format("in `toFile': the file `%1%' cannot refer to derivation outputs") % name); throw EvalError(format("in `toFile': the file `%1%' cannot refer to derivation outputs, at %2%") % name % pos);
refs.insert(path); refs.insert(path);
} }
@ -728,16 +728,16 @@ struct FilterFromExpr : PathFilter
}; };
static void prim_filterSource(EvalState & state, Value * * args, Value & v) static void prim_filterSource(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
Path path = state.coerceToPath(*args[1], context); Path path = state.coerceToPath(*args[1], context);
if (!context.empty()) if (!context.empty())
throw EvalError(format("string `%1%' cannot refer to other paths") % path); throw EvalError(format("string `%1%' cannot refer to other paths, at %2%") % path % pos);
state.forceValue(*args[0]); state.forceValue(*args[0]);
if (args[0]->type != tLambda) if (args[0]->type != tLambda)
throw TypeError(format("first argument in call to `filterSource' is not a function but %1%") % showType(*args[0])); throw TypeError(format("first argument in call to `filterSource' is not a function but %1%, at %2%") % showType(*args[0]) % pos);
FilterFromExpr filter(state, *args[0]); FilterFromExpr filter(state, *args[0]);
@ -756,7 +756,7 @@ static void prim_filterSource(EvalState & state, Value * * args, Value & v)
/* Return the names of the attributes in a set as a sorted list of /* Return the names of the attributes in a set as a sorted list of
strings. */ strings. */
static void prim_attrNames(EvalState & state, Value * * args, Value & v) static void prim_attrNames(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceAttrs(*args[0]); state.forceAttrs(*args[0]);
@ -773,14 +773,14 @@ static void prim_attrNames(EvalState & state, Value * * args, Value & v)
/* Dynamic version of the `.' operator. */ /* Dynamic version of the `.' operator. */
void prim_getAttr(EvalState & state, Value * * args, Value & v) void prim_getAttr(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
string attr = state.forceStringNoCtx(*args[0]); string attr = state.forceStringNoCtx(*args[0]);
state.forceAttrs(*args[1]); state.forceAttrs(*args[1]);
// !!! Should we create a symbol here or just do a lookup? // !!! Should we create a symbol here or just do a lookup?
Bindings::iterator i = args[1]->attrs->find(state.symbols.create(attr)); Bindings::iterator i = args[1]->attrs->find(state.symbols.create(attr));
if (i == args[1]->attrs->end()) if (i == args[1]->attrs->end())
throw EvalError(format("attribute `%1%' missing") % attr); throw EvalError(format("attribute `%1%' missing, at %2%") % attr % pos);
// !!! add to stack trace? // !!! add to stack trace?
if (state.countCalls && i->pos) state.attrSelects[*i->pos]++; if (state.countCalls && i->pos) state.attrSelects[*i->pos]++;
state.forceValue(*i->value); state.forceValue(*i->value);
@ -789,7 +789,7 @@ void prim_getAttr(EvalState & state, Value * * args, Value & v)
/* Return position information of the specified attribute. */ /* Return position information of the specified attribute. */
void prim_unsafeGetAttrPos(EvalState & state, Value * * args, Value & v) void prim_unsafeGetAttrPos(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
string attr = state.forceStringNoCtx(*args[0]); string attr = state.forceStringNoCtx(*args[0]);
state.forceAttrs(*args[1]); state.forceAttrs(*args[1]);
@ -802,7 +802,7 @@ void prim_unsafeGetAttrPos(EvalState & state, Value * * args, Value & v)
/* Dynamic version of the `?' operator. */ /* Dynamic version of the `?' operator. */
static void prim_hasAttr(EvalState & state, Value * * args, Value & v) static void prim_hasAttr(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
string attr = state.forceStringNoCtx(*args[0]); string attr = state.forceStringNoCtx(*args[0]);
state.forceAttrs(*args[1]); state.forceAttrs(*args[1]);
@ -811,14 +811,14 @@ static void prim_hasAttr(EvalState & state, Value * * args, Value & v)
/* Determine whether the argument is a set. */ /* Determine whether the argument is a set. */
static void prim_isAttrs(EvalState & state, Value * * args, Value & v) static void prim_isAttrs(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceValue(*args[0]); state.forceValue(*args[0]);
mkBool(v, args[0]->type == tAttrs); mkBool(v, args[0]->type == tAttrs);
} }
static void prim_removeAttrs(EvalState & state, Value * * args, Value & v) static void prim_removeAttrs(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceAttrs(*args[0]); state.forceAttrs(*args[0]);
state.forceList(*args[1]); state.forceList(*args[1]);
@ -846,7 +846,7 @@ static void prim_removeAttrs(EvalState & state, Value * * args, Value & v)
"nameN"; value = valueN;}] is transformed to {name1 = value1; "nameN"; value = valueN;}] is transformed to {name1 = value1;
... nameN = valueN;}. In case of duplicate occurences of the same ... nameN = valueN;}. In case of duplicate occurences of the same
name, the first takes precedence. */ name, the first takes precedence. */
static void prim_listToAttrs(EvalState & state, Value * * args, Value & v) static void prim_listToAttrs(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceList(*args[0]); state.forceList(*args[0]);
@ -860,14 +860,14 @@ static void prim_listToAttrs(EvalState & state, Value * * args, Value & v)
Bindings::iterator j = v2.attrs->find(state.sName); Bindings::iterator j = v2.attrs->find(state.sName);
if (j == v2.attrs->end()) if (j == v2.attrs->end())
throw TypeError("`name' attribute missing in a call to `listToAttrs'"); throw TypeError(format("`name' attribute missing in a call to `listToAttrs', at %1%") % pos);
string name = state.forceStringNoCtx(*j->value); string name = state.forceStringNoCtx(*j->value);
Symbol sym = state.symbols.create(name); Symbol sym = state.symbols.create(name);
if (seen.find(sym) == seen.end()) { if (seen.find(sym) == seen.end()) {
Bindings::iterator j2 = v2.attrs->find(state.symbols.create(state.sValue)); Bindings::iterator j2 = v2.attrs->find(state.symbols.create(state.sValue));
if (j2 == v2.attrs->end()) if (j2 == v2.attrs->end())
throw TypeError("`value' attribute missing in a call to `listToAttrs'"); throw TypeError(format("`value' attribute missing in a call to `listToAttrs', at %1%") % pos);
v.attrs->push_back(Attr(sym, j2->value, j2->pos)); v.attrs->push_back(Attr(sym, j2->value, j2->pos));
seen.insert(sym); seen.insert(sym);
@ -881,7 +881,7 @@ static void prim_listToAttrs(EvalState & state, Value * * args, Value & v)
/* Return the right-biased intersection of two sets as1 and as2, /* Return the right-biased intersection of two sets as1 and as2,
i.e. a set that contains every attribute from as2 that is also a i.e. a set that contains every attribute from as2 that is also a
member of as1. */ member of as1. */
static void prim_intersectAttrs(EvalState & state, Value * * args, Value & v) static void prim_intersectAttrs(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceAttrs(*args[0]); state.forceAttrs(*args[0]);
state.forceAttrs(*args[1]); state.forceAttrs(*args[1]);
@ -909,11 +909,11 @@ static void prim_intersectAttrs(EvalState & state, Value * * args, Value & v)
functionArgs (x: ...) functionArgs (x: ...)
=> { } => { }
*/ */
static void prim_functionArgs(EvalState & state, Value * * args, Value & v) static void prim_functionArgs(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceValue(*args[0]); state.forceValue(*args[0]);
if (args[0]->type != tLambda) if (args[0]->type != tLambda)
throw TypeError("`functionArgs' requires a function"); throw TypeError(format("`functionArgs' requires a function, at %1%") % pos);
if (!args[0]->lambda.fun->matchAttrs) { if (!args[0]->lambda.fun->matchAttrs) {
state.mkAttrs(v, 0); state.mkAttrs(v, 0);
@ -934,45 +934,45 @@ static void prim_functionArgs(EvalState & state, Value * * args, Value & v)
/* Determine whether the argument is a list. */ /* Determine whether the argument is a list. */
static void prim_isList(EvalState & state, Value * * args, Value & v) static void prim_isList(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceValue(*args[0]); state.forceValue(*args[0]);
mkBool(v, args[0]->type == tList); mkBool(v, args[0]->type == tList);
} }
static void elemAt(EvalState & state, Value & list, int n, Value & v) static void elemAt(EvalState & state, const Pos & pos, Value & list, int n, Value & v)
{ {
state.forceList(list); state.forceList(list);
if (n < 0 || n >= list.list.length) if (n < 0 || n >= list.list.length)
throw Error(format("list index %1% is out of bounds") % n); throw Error(format("list index %1% is out of bounds, at %2%") % n % pos);
state.forceValue(*list.list.elems[n]); state.forceValue(*list.list.elems[n]);
v = *list.list.elems[n]; v = *list.list.elems[n];
} }
/* Return the n-1'th element of a list. */ /* Return the n-1'th element of a list. */
static void prim_elemAt(EvalState & state, Value * * args, Value & v) static void prim_elemAt(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
elemAt(state, *args[0], state.forceInt(*args[1]), v); elemAt(state, pos, *args[0], state.forceInt(*args[1]), v);
} }
/* Return the first element of a list. */ /* Return the first element of a list. */
static void prim_head(EvalState & state, Value * * args, Value & v) static void prim_head(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
elemAt(state, *args[0], 0, v); elemAt(state, pos, *args[0], 0, v);
} }
/* Return a list consisting of everything but the the first element of /* Return a list consisting of everything but the the first element of
a list. Warning: this function takes O(n) time, so you probably a list. Warning: this function takes O(n) time, so you probably
don't want to use it! */ don't want to use it! */
static void prim_tail(EvalState & state, Value * * args, Value & v) static void prim_tail(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceList(*args[0]); state.forceList(*args[0]);
if (args[0]->list.length == 0) if (args[0]->list.length == 0)
throw Error("`tail' called on an empty list"); throw Error(format("`tail' called on an empty list, at %1%") % pos);
state.mkList(v, args[0]->list.length - 1); state.mkList(v, args[0]->list.length - 1);
for (unsigned int n = 0; n < v.list.length; ++n) for (unsigned int n = 0; n < v.list.length; ++n)
v.list.elems[n] = args[0]->list.elems[n + 1]; v.list.elems[n] = args[0]->list.elems[n + 1];
@ -980,7 +980,7 @@ static void prim_tail(EvalState & state, Value * * args, Value & v)
/* Apply a function to every element of a list. */ /* Apply a function to every element of a list. */
static void prim_map(EvalState & state, Value * * args, Value & v) static void prim_map(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceFunction(*args[0]); state.forceFunction(*args[0]);
state.forceList(*args[1]); state.forceList(*args[1]);
@ -996,7 +996,7 @@ static void prim_map(EvalState & state, Value * * args, Value & v)
/* Filter a list using a predicate; that is, return a list containing /* Filter a list using a predicate; that is, return a list containing
every element from the list for which the predicate function every element from the list for which the predicate function
returns true. */ returns true. */
static void prim_filter(EvalState & state, Value * * args, Value & v) static void prim_filter(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceFunction(*args[0]); state.forceFunction(*args[0]);
state.forceList(*args[1]); state.forceList(*args[1]);
@ -1025,7 +1025,7 @@ static void prim_filter(EvalState & state, Value * * args, Value & v)
/* Return true if a list contains a given element. */ /* Return true if a list contains a given element. */
static void prim_elem(EvalState & state, Value * * args, Value & v) static void prim_elem(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
bool res = false; bool res = false;
state.forceList(*args[1]); state.forceList(*args[1]);
@ -1039,7 +1039,7 @@ static void prim_elem(EvalState & state, Value * * args, Value & v)
/* Concatenate a list of lists. */ /* Concatenate a list of lists. */
static void prim_concatLists(EvalState & state, Value * * args, Value & v) static void prim_concatLists(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceList(*args[0]); state.forceList(*args[0]);
state.concatLists(v, args[0]->list.length, args[0]->list.elems); state.concatLists(v, args[0]->list.length, args[0]->list.elems);
@ -1047,7 +1047,7 @@ static void prim_concatLists(EvalState & state, Value * * args, Value & v)
/* Return the length of a list. This is an O(1) time operation. */ /* Return the length of a list. This is an O(1) time operation. */
static void prim_length(EvalState & state, Value * * args, Value & v) static void prim_length(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceList(*args[0]); state.forceList(*args[0]);
mkInt(v, args[0]->list.length); mkInt(v, args[0]->list.length);
@ -1059,33 +1059,33 @@ static void prim_length(EvalState & state, Value * * args, Value & v)
*************************************************************/ *************************************************************/
static void prim_add(EvalState & state, Value * * args, Value & v) static void prim_add(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
mkInt(v, state.forceInt(*args[0]) + state.forceInt(*args[1])); mkInt(v, state.forceInt(*args[0]) + state.forceInt(*args[1]));
} }
static void prim_sub(EvalState & state, Value * * args, Value & v) static void prim_sub(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
mkInt(v, state.forceInt(*args[0]) - state.forceInt(*args[1])); mkInt(v, state.forceInt(*args[0]) - state.forceInt(*args[1]));
} }
static void prim_mul(EvalState & state, Value * * args, Value & v) static void prim_mul(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
mkInt(v, state.forceInt(*args[0]) * state.forceInt(*args[1])); mkInt(v, state.forceInt(*args[0]) * state.forceInt(*args[1]));
} }
static void prim_div(EvalState & state, Value * * args, Value & v) static void prim_div(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
NixInt i2 = state.forceInt(*args[1]); NixInt i2 = state.forceInt(*args[1]);
if (i2 == 0) throw EvalError("division by zero"); if (i2 == 0) throw EvalError(format("division by zero, at %1%") % pos);
mkInt(v, state.forceInt(*args[0]) / i2); mkInt(v, state.forceInt(*args[0]) / i2);
} }
static void prim_lessThan(EvalState & state, Value * * args, Value & v) static void prim_lessThan(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
state.forceValue(*args[0]); state.forceValue(*args[0]);
state.forceValue(*args[1]); state.forceValue(*args[1]);
@ -1102,7 +1102,7 @@ static void prim_lessThan(EvalState & state, Value * * args, Value & v)
/* Convert the argument to a string. Paths are *not* copied to the /* Convert the argument to a string. Paths are *not* copied to the
store, so `toString /foo/bar' yields `"/foo/bar"', not store, so `toString /foo/bar' yields `"/foo/bar"', not
`"/nix/store/whatever..."'. */ `"/nix/store/whatever..."'. */
static void prim_toString(EvalState & state, Value * * args, Value & v) static void prim_toString(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
string s = state.coerceToString(*args[0], context, true, false); string s = state.coerceToString(*args[0], context, true, false);
@ -1114,20 +1114,20 @@ static void prim_toString(EvalState & state, Value * * args, Value & v)
at character position `min(start, stringLength str)' inclusive and at character position `min(start, stringLength str)' inclusive and
ending at `min(start + len, stringLength str)'. `start' must be ending at `min(start + len, stringLength str)'. `start' must be
non-negative. */ non-negative. */
static void prim_substring(EvalState & state, Value * * args, Value & v) static void prim_substring(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
int start = state.forceInt(*args[0]); int start = state.forceInt(*args[0]);
int len = state.forceInt(*args[1]); int len = state.forceInt(*args[1]);
PathSet context; PathSet context;
string s = state.coerceToString(*args[2], context); string s = state.coerceToString(*args[2], context);
if (start < 0) throw EvalError("negative start position in `substring'"); if (start < 0) throw EvalError(format("negative start position in `substring', at %1%") % pos);
mkString(v, start >= s.size() ? "" : string(s, start, len), context); mkString(v, start >= s.size() ? "" : string(s, start, len), context);
} }
static void prim_stringLength(EvalState & state, Value * * args, Value & v) static void prim_stringLength(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
string s = state.coerceToString(*args[0], context); string s = state.coerceToString(*args[0], context);
@ -1135,7 +1135,7 @@ static void prim_stringLength(EvalState & state, Value * * args, Value & v)
} }
static void prim_unsafeDiscardStringContext(EvalState & state, Value * * args, Value & v) static void prim_unsafeDiscardStringContext(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
string s = state.coerceToString(*args[0], context); string s = state.coerceToString(*args[0], context);
@ -1149,7 +1149,7 @@ static void prim_unsafeDiscardStringContext(EvalState & state, Value * * args, V
source-only deployment). This primop marks the string context so source-only deployment). This primop marks the string context so
that builtins.derivation adds the path to drv.inputSrcs rather than that builtins.derivation adds the path to drv.inputSrcs rather than
drv.inputDrvs. */ drv.inputDrvs. */
static void prim_unsafeDiscardOutputDependency(EvalState & state, Value * * args, Value & v) static void prim_unsafeDiscardOutputDependency(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
PathSet context; PathSet context;
string s = state.coerceToString(*args[0], context); string s = state.coerceToString(*args[0], context);
@ -1166,12 +1166,12 @@ static void prim_unsafeDiscardOutputDependency(EvalState & state, Value * * args
/* Return the cryptographic hash of a string in base-16. */ /* Return the cryptographic hash of a string in base-16. */
static void prim_hashString(EvalState & state, Value * * args, Value & v) static void prim_hashString(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
string type = state.forceStringNoCtx(*args[0]); string type = state.forceStringNoCtx(*args[0]);
HashType ht = parseHashType(type); HashType ht = parseHashType(type);
if (ht == htUnknown) if (ht == htUnknown)
throw Error(format("unknown hash type `%1%'") % type); throw Error(format("unknown hash type `%1%', at %2%") % type % pos);
PathSet context; // discarded PathSet context; // discarded
string s = state.forceString(*args[1], context); string s = state.forceString(*args[1], context);
@ -1185,7 +1185,7 @@ static void prim_hashString(EvalState & state, Value * * args, Value & v)
*************************************************************/ *************************************************************/
static void prim_parseDrvName(EvalState & state, Value * * args, Value & v) static void prim_parseDrvName(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
string name = state.forceStringNoCtx(*args[0]); string name = state.forceStringNoCtx(*args[0]);
DrvName parsed(name); DrvName parsed(name);
@ -1196,7 +1196,7 @@ static void prim_parseDrvName(EvalState & state, Value * * args, Value & v)
} }
static void prim_compareVersions(EvalState & state, Value * * args, Value & v) static void prim_compareVersions(EvalState & state, const Pos & pos, Value * * args, Value & v)
{ {
string version1 = state.forceStringNoCtx(*args[0]); string version1 = state.forceStringNoCtx(*args[0]);
string version2 = state.forceStringNoCtx(*args[1]); string version2 = state.forceStringNoCtx(*args[1]);