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commit
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1 changed files with 55 additions and 12 deletions
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@ -29,6 +29,8 @@ typedef enum {
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tInt = 1,
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tBool,
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tString,
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tPath,
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tNull,
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tAttrs,
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tList,
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tThunk,
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@ -157,6 +159,23 @@ std::ostream & operator << (std::ostream & str, Value & v)
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static void eval(Env & env, Expr e, Value & v);
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string showType(Value & v)
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{
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switch (v.type) {
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case tString: return "a string";
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case tPath: return "a path";
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case tNull: return "null";
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case tInt: return "an integer";
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case tBool: return "a boolean";
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case tLambda: return "a function";
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case tAttrs: return "an attribute set";
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case tList: return "a list";
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case tPrimOpApp: return "a partially applied built-in function";
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default: throw Error("unknown type");
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}
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}
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static void forceValue(Value & v)
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{
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if (v.type == tThunk) {
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@ -172,6 +191,30 @@ static void forceValue(Value & v)
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}
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static void forceInt(Value & v)
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{
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forceValue(v);
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if (v.type != tInt)
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throw TypeError(format("value is %1% while an integer was expected") % showType(v));
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}
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static void forceAttrs(Value & v)
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{
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forceValue(v);
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if (v.type != tAttrs)
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throw TypeError(format("value is %1% while an attribute set was expected") % showType(v));
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}
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static void forceList(Value & v)
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{
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forceValue(v);
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if (v.type != tList)
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throw TypeError(format("value is %1% while a list was expected") % showType(v));
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}
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static Value * lookupWith(Env * env, Sym name)
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{
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if (!env) return 0;
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@ -247,7 +290,7 @@ static bool eqValues(Value & v1, Value & v2)
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}
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unsigned long nrValues = 0, nrEnvs = 0;
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unsigned long nrValues = 0, nrEnvs = 0, nrEvaluated = 0;
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static Value * allocValues(unsigned int count)
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{
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@ -272,6 +315,8 @@ static void eval(Env & env, Expr e, Value & v)
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printMsg(lvlError, format("eval: %1%") % e);
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nrEvaluated++;
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Sym name;
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if (matchVar(e, name)) {
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Value * v2 = lookupVar(&env, name);
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@ -328,7 +373,7 @@ static void eval(Env & env, Expr e, Value & v)
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Expr e1, e2;
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if (matchSelect(e, e2, name)) {
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eval(env, e2, v);
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if (v.type != tAttrs) throw TypeError("expected attribute set");
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forceAttrs(v); // !!! eval followed by force is slightly inefficient
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Bindings::iterator i = v.attrs->find(name);
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if (i == v.attrs->end()) throw TypeError("attribute not found");
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forceValue(i->second);
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@ -409,7 +454,7 @@ static void eval(Env & env, Expr e, Value & v)
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}
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eval(env, arg, *vArg);
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if (vArg->type != tAttrs) throw TypeError("expected attribute set");
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forceAttrs(*vArg);
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/* For each formal argument, get the actual argument. If
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there is no matching actual argument but the formal
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@ -459,7 +504,7 @@ static void eval(Env & env, Expr e, Value & v)
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Value & vAttrs = env2.bindings[sWith];
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nrValues++;
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eval(env, attrs, vAttrs);
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if (vAttrs.type != tAttrs) throw TypeError("`with' should evaluate to an attribute set");
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forceAttrs(vAttrs);
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eval(env2, body, v);
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return;
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@ -490,9 +535,9 @@ static void eval(Env & env, Expr e, Value & v)
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if (matchOpConcat(e, e1, e2)) {
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Value v1; eval(env, e1, v1);
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if (v1.type != tList) throw TypeError("list expected");
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forceList(v1);
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Value v2; eval(env, e2, v2);
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if (v2.type != tList) throw TypeError("list expected");
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forceList(v2);
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v.type = tList;
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v.list.length = v1.list.length + v2.list.length;
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v.list.elems = allocValues(v.list.length);
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@ -546,8 +591,7 @@ static void strictEval(Env & env, Expr e, Value & v)
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static void prim_head(Value * * args, Value & v)
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{
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forceValue(*args[0]);
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if (args[0]->type != tList) throw TypeError("list expected");
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forceList(*args[0]);
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if (args[0]->list.length == 0)
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throw Error("`head' called on an empty list");
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forceValue(args[0]->list.elems[0]);
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@ -557,10 +601,8 @@ static void prim_head(Value * * args, Value & v)
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static void prim_add(Value * * args, Value & v)
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{
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forceValue(*args[0]);
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if (args[0]->type != tInt) throw TypeError("integer expected");
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forceValue(*args[1]);
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if (args[1]->type != tInt) throw TypeError("integer expected");
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forceInt(*args[0]);
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forceInt(*args[1]);
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mkInt(v, args[0]->integer + args[1]->integer);
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}
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@ -649,6 +691,7 @@ void run(Strings args)
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printMsg(lvlError, format("alloced %1% values") % nrValues);
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printMsg(lvlError, format("alloced %1% environments") % nrEnvs);
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printMsg(lvlError, format("evaluated %1% expressions") % nrEvaluated);
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printMsg(lvlError, format("each eval() uses %1% bytes of stack space") % (p1 - p2));
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}
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