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* More operators / primops.

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This commit is contained in:
Eelco Dolstra 2010-03-30 18:05:54 +00:00
parent c9170be2bd
commit 47df476daa
5 changed files with 145 additions and 187 deletions
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1
src/libexpr/eval-test.cc
View file

@ -72,6 +72,7 @@ void run(Strings args)
//doTest("import ./foo.nix");
doTest("map (x: __add 1 x) [ 1 2 3 ]");
doTest("map (builtins.add 1) [ 1 2 3 ]");
doTest("builtins.hasAttr \"x\" { x = 1; }");
}

248
src/libexpr/eval.cc
View file

@ -167,6 +167,28 @@ static void mkThunk(Value & v, Env & env, Expr expr)
}
void mkString(Value & v, const char * s)
{
v.type = tString;
v.string.s = strdup(s);
v.string.context = 0;
}
void mkString(Value & v, const string & s, const PathSet & context)
{
mkString(v, s.c_str());
// !!! context
}
void mkPath(Value & v, const char * s)
{
v.type = tPath;
v.path = strdup(s);
}
static Value * lookupWith(Env * env, Sym name)
{
if (!env) return 0;
@ -206,7 +228,7 @@ static Value * lookupVar(Env * env, Sym name)
}
#endif
throw Error("undefined variable");
throw Error(format("undefined variable `%1%'") % aterm2String(name));
}
@ -257,38 +279,35 @@ void EvalState::eval(Env & env, Expr e, Value & v)
char x;
if (&x < deepestStack) deepestStack = &x;
printMsg(lvlError, format("eval: %1%") % e);
debug(format("eval: %1%") % e);
nrEvaluated++;
Sym name;
int n;
ATerm s; ATermList context, es;
ATermList rbnds, nrbnds;
Expr e1, e2, e3, fun, arg, attrs;
Pattern pat; Expr body; Pos pos;
if (matchVar(e, name)) {
Value * v2 = lookupVar(&env, name);
forceValue(*v2);
v = *v2;
return;
}
int n;
if (matchInt(e, n)) {
else if (matchInt(e, n))
mkInt(v, n);
return;
}
ATerm s; ATermList context;
if (matchStr(e, s, context)) {
else if (matchStr(e, s, context)) {
assert(context == ATempty);
mkString(v, strdup(ATgetName(ATgetAFun(s))));
return;
mkString(v, ATgetName(ATgetAFun(s)));
}
if (matchPath(e, s)) {
mkPath(v, strdup(ATgetName(ATgetAFun(s))));
return;
}
else if (matchPath(e, s))
mkPath(v, ATgetName(ATgetAFun(s)));
ATermList es;
if (matchAttrs(e, es)) {
else if (matchAttrs(e, es)) {
v.type = tAttrs;
v.attrs = new Bindings;
ATerm e2, pos;
@ -298,11 +317,9 @@ void EvalState::eval(Env & env, Expr e, Value & v)
nrValues++;
mkThunk(v2, env, e2);
}
return;
}
ATermList rbnds, nrbnds;
if (matchRec(e, rbnds, nrbnds)) {
else if (matchRec(e, rbnds, nrbnds)) {
Env & env2(allocEnv());
env2.up = &env;
@ -315,12 +332,9 @@ void EvalState::eval(Env & env, Expr e, Value & v)
nrValues++;
mkThunk(v2, env2, e2);
}
return;
}
Expr e1, e2;
if (matchSelect(e, e2, name)) {
else if (matchSelect(e, e2, name)) {
eval(env, e2, v);
forceAttrs(v); // !!! eval followed by force is slightly inefficient
Bindings::iterator i = v.attrs->find(name);
@ -333,29 +347,23 @@ void EvalState::eval(Env & env, Expr e, Value & v)
throw;
}
v = i->second;
return;
}
Pattern pat; Expr body; Pos pos;
if (matchFunction(e, pat, body, pos)) {
else if (matchFunction(e, pat, body, pos)) {
v.type = tLambda;
v.lambda.env = &env;
v.lambda.pat = pat;
v.lambda.body = body;
return;
}
Expr fun, arg;
if (matchCall(e, fun, arg)) {
else if (matchCall(e, fun, arg)) {
eval(env, fun, v);
Value vArg;
mkThunk(vArg, env, arg); // !!! should this be on the heap?
callFunction(v, vArg, v);
return;
}
Expr attrs;
if (matchWith(e, attrs, body, pos)) {
else if (matchWith(e, attrs, body, pos)) {
Env & env2(allocEnv());
env2.up = &env;
@ -365,31 +373,27 @@ void EvalState::eval(Env & env, Expr e, Value & v)
forceAttrs(vAttrs);
eval(env2, body, v);
return;
}
if (matchList(e, es)) {
else if (matchList(e, es)) {
mkList(v, ATgetLength(es));
for (unsigned int n = 0; n < v.list.length; ++n, es = ATgetNext(es))
mkThunk(v.list.elems[n], env, ATgetFirst(es));
return;
}
if (matchOpEq(e, e1, e2)) {
else if (matchOpEq(e, e1, e2)) {
Value v1; eval(env, e1, v1);
Value v2; eval(env, e2, v2);
mkBool(v, eqValues(v1, v2));
return;
}
if (matchOpNEq(e, e1, e2)) {
else if (matchOpNEq(e, e1, e2)) {
Value v1; eval(env, e1, v1);
Value v2; eval(env, e2, v2);
mkBool(v, !eqValues(v1, v2));
return;
}
if (matchOpConcat(e, e1, e2)) {
else if (matchOpConcat(e, e1, e2)) {
Value v1; eval(env, e1, v1);
forceList(v1);
Value v2; eval(env, e2, v2);
@ -401,10 +405,9 @@ void EvalState::eval(Env & env, Expr e, Value & v)
v.list.elems[n] = v1.list.elems[n];
for (unsigned int n = 0; n < v2.list.length; ++n)
v.list.elems[n + v1.list.length] = v2.list.elems[n];
return;
}
if (matchConcatStrings(e, es)) {
else if (matchConcatStrings(e, es)) {
PathSet context;
std::ostringstream s;
@ -431,24 +434,62 @@ void EvalState::eval(Env & env, Expr e, Value & v)
% s.str());
if (isPath)
mkPath(v, strdup(s.str().c_str()));
mkPath(v, s.str().c_str());
else
mkString(v, strdup(s.str().c_str())); // !!! context
return;
mkString(v, s.str().c_str()); // !!! context
}
Expr e3;
if (matchIf(e, e1, e2, e3)) {
/* Conditionals. */
else if (matchIf(e, e1, e2, e3))
eval(env, evalBool(env, e1) ? e2 : e3, v);
return;
/* Assertions. */
else if (matchAssert(e, e1, e2, pos)) {
if (!evalBool(env, e1))
throw AssertionError(format("assertion failed at %1%") % showPos(pos));
eval(env, e2, v);
}
if (matchOpOr(e, e1, e2)) {
/* Negation. */
else if (matchOpNot(e, e1))
mkBool(v, !evalBool(env, e1));
/* Implication. */
else if (matchOpImpl(e, e1, e2))
return mkBool(v, !evalBool(env, e1) || evalBool(env, e2));
/* Conjunction (logical AND). */
else if (matchOpAnd(e, e1, e2))
mkBool(v, evalBool(env, e1) && evalBool(env, e2));
/* Disjunction (logical OR). */
else if (matchOpOr(e, e1, e2))
mkBool(v, evalBool(env, e1) || evalBool(env, e2));
return;
/* Attribute set update (//). */
else if (matchOpUpdate(e, e1, e2)) {
v.type = tAttrs;
v.attrs = new Bindings;
Value v2;
eval(env, e2, v2);
foreach (Bindings::iterator, i, *v2.attrs)
(*v.attrs)[i->first] = i->second;
eval(env, e1, v2);
foreach (Bindings::iterator, i, *v2.attrs)
if (v.attrs->find(i->first) == v.attrs->end())
(*v.attrs)[i->first] = i->second;
}
throw Error("unsupported term");
/* Attribute existence test (?). */
else if (matchOpHasAttr(e, e1, name)) {
eval(env, e1, v);
forceAttrs(v);
mkBool(v, v.attrs->find(name) != v.attrs->end());
}
else throw Error("unsupported term");
}
@ -637,6 +678,18 @@ void EvalState::forceFunction(Value & v)
}
string EvalState::forceStringNoCtx(Value & v)
{
forceValue(v);
if (v.type != tString)
throw TypeError(format("value is %1% while a string was expected") % showType(v));
if (v.string.context)
throw EvalError(format("the string `%1%' is not allowed to refer to a store path (such as `%2%')")
% v.string.s % v.string.context[0]);
return string(v.string.s);
}
string EvalState::coerceToString(Value & v, PathSet & context,
bool coerceMore, bool copyToStore)
{
@ -901,68 +954,6 @@ LocalNoInline(ATerm expandRec(EvalState & state, ATerm e, ATermList rbnds, ATerm
}
LocalNoInline(Expr updateAttrs(Expr e1, Expr e2))
{
/* Note: e1 and e2 should be in normal form. */
ATermMap attrs;
queryAllAttrs(e1, attrs, true);
queryAllAttrs(e2, attrs, true);
return makeAttrs(attrs);
}
string evalString(EvalState & state, Expr e, PathSet & context)
{
e = evalExpr(state, e);
string s;
if (!matchStr(e, s, context))
throwTypeError("value is %1% while a string was expected", showType(e));
return s;
}
string evalStringNoCtx(EvalState & state, Expr e)
{
PathSet context;
string s = evalString(state, e, context);
if (!context.empty())
throw EvalError(format("the string `%1%' is not allowed to refer to a store path (such as `%2%')")
% s % *(context.begin()));
return s;
}
int evalInt(EvalState & state, Expr e)
{
e = evalExpr(state, e);
int i;
if (!matchInt(e, i))
throwTypeError("value is %1% while an integer was expected", showType(e));
return i;
}
bool evalBool(EvalState & state, Expr e)
{
e = evalExpr(state, e);
if (e == eTrue) return true;
else if (e == eFalse) return false;
else throwTypeError("value is %1% while a boolean was expected", showType(e));
}
ATermList evalList(EvalState & state, Expr e)
{
e = evalExpr(state, e);
ATermList list;
if (!matchList(e, list))
throwTypeError("value is %1% while a list was expected", showType(e));
return list;
}
static void flattenList(EvalState & state, Expr e, ATermList & result)
{
ATermList es;
@ -1078,14 +1069,6 @@ LocalNoInline(Expr evalCall(EvalState & state, Expr fun, Expr arg))
}
LocalNoInline(Expr evalAssert(EvalState & state, Expr cond, Expr body, ATerm pos))
{
if (!evalBool(state, cond))
throw AssertionError(format("assertion failed at %1%") % showPos(pos));
return evalExpr(state, body);
}
LocalNoInline(Expr evalWith(EvalState & state, Expr defs, Expr body, ATerm pos))
{
ATermMap attrs;
@ -1109,14 +1092,6 @@ LocalNoInline(Expr evalWith(EvalState & state, Expr defs, Expr body, ATerm pos))
}
LocalNoInline(Expr evalHasAttr(EvalState & state, Expr e, ATerm name))
{
ATermMap attrs;
queryAllAttrs(evalExpr(state, e), attrs);
return makeBool(attrs.get(name) != 0);
}
LocalNoInline(Expr evalPlusConcat(EvalState & state, Expr e))
{
Expr e1, e2;
@ -1177,19 +1152,6 @@ LocalNoInline(Expr evalSubPath(EvalState & state, Expr e1, Expr e2))
}
LocalNoInline(Expr evalOpConcat(EvalState & state, Expr e1, Expr e2))
{
try {
ATermList l1 = evalList(state, e1);
ATermList l2 = evalList(state, e2);
return makeList(ATconcat(l1, l2));
} catch (Error & e) {
addErrorPrefix(e, "in a list concatenation:\n");
throw;
}
}
/* Implementation of the `==' and `!=' operators. */
LocalNoInline(bool areEqual(EvalState & state, Expr e1, Expr e2))
{

18
src/libexpr/eval.hh
View file

@ -104,19 +104,9 @@ static inline void mkBool(Value & v, bool b)
}
static inline void mkString(Value & v, const char * s)
{
v.type = tString;
v.string.s = s;
v.string.context = 0;
}
static inline void mkPath(Value & v, const char * s)
{
v.type = tPath;
v.path = s;
}
void mkString(Value & v, const char * s);
void mkString(Value & v, const string & s, const PathSet & context);
void mkPath(Value & v, const char * s);
typedef std::map<Path, PathSet> DrvRoots;
@ -177,6 +167,7 @@ public:
void forceAttrs(Value & v);
void forceList(Value & v);
void forceFunction(Value & v); // either lambda or primop
string forceStringNoCtx(Value & v);
/* String coercion. Converts strings, paths and derivations to a
string. If `coerceMore' is set, also converts nulls, integers,
@ -234,7 +225,6 @@ Expr strictEvalExpr(EvalState & state, Expr e);
/* Specific results. */
string evalString(EvalState & state, Expr e, PathSet & context);
string evalStringNoCtx(EvalState & state, Expr e);
int evalInt(EvalState & state, Expr e);
bool evalBool(EvalState & state, Expr e);
ATermList evalList(EvalState & state, Expr e);

55
src/libexpr/primops.cc
View file

@ -687,24 +687,32 @@ static void prim_attrNames(EvalState & state, Value * * args, Value & v)
return makeList(list);
}
#endif
/* Dynamic version of the `.' operator. */
static void prim_getAttr(EvalState & state, Value * * args, Value & v)
{
string attr = evalStringNoCtx(state, args[0]);
return evalExpr(state, makeSelect(args[1], toATerm(attr)));
string attr = state.forceStringNoCtx(*args[0]);
state.forceAttrs(*args[1]);
Bindings::iterator i = args[1]->attrs->find(toATerm(attr));
if (i == args[1]->attrs->end())
throw EvalError(format("attribute `%1%' missing") % attr);
state.forceValue(i->second);
v = i->second;
}
/* Dynamic version of the `?' operator. */
static void prim_hasAttr(EvalState & state, Value * * args, Value & v)
{
string attr = evalStringNoCtx(state, args[0]);
return evalExpr(state, makeOpHasAttr(args[1], toATerm(attr)));
string attr = state.forceStringNoCtx(*args[0]);
state.forceAttrs(*args[1]);
mkBool(v, args[1]->attrs->find(toATerm(attr)) != args[1]->attrs->end());
}
#if 0
/* Builds an attribute set from a list specifying (name, value)
pairs. To be precise, a list [{name = "name1"; value = value1;}
... {name = "nameN"; value = valueN;}] is transformed to {name1 =
@ -896,31 +904,24 @@ static void prim_add(EvalState & state, Value * * args, Value & v)
}
#if 0
static void prim_sub(EvalState & state, Value * * args, Value & v)
{
int i1 = evalInt(state, args[0]);
int i2 = evalInt(state, args[1]);
return makeInt(i1 - i2);
mkInt(v, state.forceInt(*args[0]) - state.forceInt(*args[1]));
}
static void prim_mul(EvalState & state, Value * * args, Value & v)
{
int i1 = evalInt(state, args[0]);
int i2 = evalInt(state, args[1]);
return makeInt(i1 * i2);
mkInt(v, state.forceInt(*args[0]) * state.forceInt(*args[1]));
}
static void prim_div(EvalState & state, Value * * args, Value & v)
{
int i1 = evalInt(state, args[0]);
int i2 = evalInt(state, args[1]);
int i2 = state.forceInt(*args[1]);
if (i2 == 0) throw EvalError("division by zero");
return makeInt(i1 / i2);
mkInt(v, state.forceInt(*args[0]) / i2);
}
#endif
static void prim_lessThan(EvalState & state, Value * * args, Value & v)
@ -941,36 +942,36 @@ static void prim_toString(EvalState & state, Value * * args, Value & v)
{
PathSet context;
string s = state.coerceToString(*args[0], context, true, false);
mkString(v, strdup(s.c_str())); // !!! context
mkString(v, s.c_str()); // !!! context
}
#if 0
/* `substring start len str' returns the substring of `str' starting
at character position `min(start, stringLength str)' inclusive and
ending at `min(start + len, stringLength str)'. `start' must be
non-negative. */
static void prim_substring(EvalState & state, Value * * args, Value & v)
{
int start = evalInt(state, args[0]);
int len = evalInt(state, args[1]);
int start = state.forceInt(*args[0]);
int len = state.forceInt(*args[1]);
PathSet context;
string s = coerceToString(state, args[2], context);
string s = state.coerceToString(*args[2], context);
if (start < 0) throw EvalError("negative start position in `substring'");
return makeStr(string(s, start, len), context);
mkString(v, string(s, start, len), context);
}
static void prim_stringLength(EvalState & state, Value * * args, Value & v)
{
PathSet context;
string s = coerceToString(state, args[0], context);
return makeInt(s.size());
string s = state.coerceToString(*args[0], context);
mkInt(v, s.size());
}
#if 0
static void prim_unsafeDiscardStringContext(EvalState & state, Value * * args, Value & v)
{
PathSet context;
@ -1078,7 +1079,7 @@ void EvalState::createBaseEnv()
mkInt(v, time(0));
addConstant("__currentTime", v);
mkString(v, strdup(thisSystem.c_str()));
mkString(v, thisSystem.c_str());
addConstant("__currentSystem", v);
// Miscellaneous
@ -1120,8 +1121,10 @@ void EvalState::createBaseEnv()
// Attribute sets
addPrimOp("__attrNames", 1, prim_attrNames);
#endif
addPrimOp("__getAttr", 2, prim_getAttr);
addPrimOp("__hasAttr", 2, prim_hasAttr);
#if 0
addPrimOp("__isAttrs", 1, prim_isAttrs);
addPrimOp("removeAttrs", 2, prim_removeAttrs);
addPrimOp("__listToAttrs", 1, prim_listToAttrs);
@ -1140,18 +1143,16 @@ void EvalState::createBaseEnv()
// Integer arithmetic
addPrimOp("__add", 2, prim_add);
#if 0
addPrimOp("__sub", 2, prim_sub);
addPrimOp("__mul", 2, prim_mul);
addPrimOp("__div", 2, prim_div);
#endif
addPrimOp("__lessThan", 2, prim_lessThan);
// String manipulation
addPrimOp("toString", 1, prim_toString);
#if 0
addPrimOp("__substring", 3, prim_substring);
addPrimOp("__stringLength", 1, prim_stringLength);
#if 0
addPrimOp("__unsafeDiscardStringContext", 1, prim_unsafeDiscardStringContext);
addPrimOp("__unsafeDiscardOutputDependency", 1, prim_unsafeDiscardOutputDependency);

4
src/nix-instantiate/nix-instantiate.cc
View file

@ -71,9 +71,13 @@ void processExpr(EvalState & state, const Strings & attrPaths,
bool parseOnly, bool strict, const ATermMap & autoArgs,
bool evalOnly, bool xmlOutput, Expr e)
{
if (parseOnly)
std::cout << format("%1%\n") % canonicaliseExpr(e);
else {
Value v;
state.strictEval(e, v);
std::cout << v << std::endl;
}
#if 0
for (Strings::const_iterator i = attrPaths.begin(); i != attrPaths.end(); ++i) {