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https://github.com/NixOS/nix.git
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* Don't use ATerms for the abstract syntax trees anymore. Not
finished yet.
This commit is contained in:
Eelco Dolstra
parent
ed711f73bc
commit
4d6ad5be17
19 changed files with 693 additions and 579 deletions
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@ -4,7 +4,6 @@
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#include "util.hh"
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#include "store-api.hh"
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#include "derivations.hh"
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#include "nixexpr-ast.hh"
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#include "globals.hh"
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#include <cstring>
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@ -45,7 +44,7 @@ std::ostream & operator << (std::ostream & str, Value & v)
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case tAttrs:
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str << "{ ";
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foreach (Bindings::iterator, i, *v.attrs)
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str << aterm2String(i->first) << " = " << i->second << "; ";
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str << i->first << " = " << i->second << "; ";
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str << "}";
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break;
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case tList:
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@ -96,8 +95,6 @@ EvalState::EvalState() : baseEnv(allocEnv())
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nrValues = nrEnvs = nrEvaluated = recursionDepth = maxRecursionDepth = 0;
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deepestStack = (char *) -1;
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initNixExprHelpers();
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createBaseEnv();
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allowUnsafeEquality = getEnv("NIX_NO_UNSAFE_EQ", "") == "";
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@ -112,9 +109,9 @@ EvalState::~EvalState()
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void EvalState::addConstant(const string & name, Value & v)
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{
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baseEnv.bindings[toATerm(name)] = v;
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baseEnv.bindings[name] = v;
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string name2 = string(name, 0, 2) == "__" ? string(name, 2) : name;
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(*baseEnv.bindings[toATerm("builtins")].attrs)[toATerm(name2)] = v;
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(*baseEnv.bindings["builtins"].attrs)[name2] = v;
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nrValues += 2;
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}
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@ -126,9 +123,9 @@ void EvalState::addPrimOp(const string & name,
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v.type = tPrimOp;
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v.primOp.arity = arity;
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v.primOp.fun = primOp;
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baseEnv.bindings[toATerm(name)] = v;
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baseEnv.bindings[name] = v;
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string name2 = string(name, 0, 2) == "__" ? string(name, 2) : name;
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(*baseEnv.bindings[toATerm("builtins")].attrs)[toATerm(name2)] = v;
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(*baseEnv.bindings["builtins"].attrs)[name2] = v;
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nrValues += 2;
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}
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@ -212,12 +209,12 @@ void mkPath(Value & v, const char * s)
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}
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static Value * lookupWith(Env * env, Sym name)
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static Value * lookupWith(Env * env, const Sym & name)
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{
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if (!env) return 0;
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Value * v = lookupWith(env->up, name);
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if (v) return v;
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Bindings::iterator i = env->bindings.find(sWith);
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Bindings::iterator i = env->bindings.find("<with>");
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if (i == env->bindings.end()) return 0;
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Bindings::iterator j = i->second.attrs->find(name);
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if (j != i->second.attrs->end()) return &j->second;
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@ -225,7 +222,7 @@ static Value * lookupWith(Env * env, Sym name)
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}
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static Value * lookupVar(Env * env, Sym name)
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static Value * lookupVar(Env * env, const Sym & name)
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{
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/* First look for a regular variable binding for `name'. */
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for (Env * env2 = env; env2; env2 = env2->up) {
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@ -251,7 +248,7 @@ static Value * lookupVar(Env * env, Sym name)
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}
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#endif
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throwEvalError("undefined variable `%1%'", aterm2String(name));
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throwEvalError("undefined variable `%1%'", name);
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}
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@ -284,7 +281,7 @@ void EvalState::mkAttrs(Value & v)
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}
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void EvalState::mkThunk_(Value & v, Expr expr)
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void EvalState::mkThunk_(Value & v, Expr * expr)
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{
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mkThunk(v, baseEnv, expr);
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}
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@ -302,11 +299,11 @@ void EvalState::evalFile(const Path & path, Value & v)
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{
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startNest(nest, lvlTalkative, format("evaluating file `%1%'") % path);
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Expr e = parseTrees.get(toATerm(path));
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Expr * e = parseTrees[path];
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if (!e) {
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e = parseExprFromFile(*this, path);
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parseTrees.set(toATerm(path), e);
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e = parseExprFromFile(path);
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parseTrees[path] = e;
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}
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try {
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@ -334,7 +331,7 @@ struct RecursionCounter
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};
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void EvalState::eval(Env & env, Expr e, Value & v)
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void EvalState::eval(Env & env, Expr * e, Value & v)
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{
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/* When changing this function, make sure that you don't cause a
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(large) increase in stack consumption! */
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@ -350,6 +347,9 @@ void EvalState::eval(Env & env, Expr e, Value & v)
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nrEvaluated++;
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e->eval(*this, env, v);
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#if 0
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Sym name;
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int n;
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ATerm s; ATermList context, es;
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@ -357,138 +357,6 @@ void EvalState::eval(Env & env, Expr e, Value & v)
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Expr e1, e2, e3, fun, arg, attrs;
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Pattern pat; Expr body; Pos pos;
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if (matchVar(e, name)) {
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Value * v2 = lookupVar(&env, name);
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forceValue(*v2);
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v = *v2;
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}
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else if (matchInt(e, n))
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mkInt(v, n);
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else if (matchStr(e, s, context)) {
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assert(context == ATempty);
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mkString(v, ATgetName(ATgetAFun(s)));
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}
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else if (matchPath(e, s))
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mkPath(v, ATgetName(ATgetAFun(s)));
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else if (matchAttrs(e, es)) {
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mkAttrs(v);
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ATerm e2, pos;
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for (ATermIterator i(es); i; ++i) {
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if (!matchBind(*i, name, e2, pos)) abort(); /* can't happen */
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Value & v2 = (*v.attrs)[name];
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nrValues++;
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mkThunk(v2, env, e2);
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}
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}
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else if (matchRec(e, rbnds, nrbnds)) {
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/* Create a new environment that contains the attributes in
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this `rec'. */
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Env & env2(allocEnv());
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env2.up = &env;
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v.type = tAttrs;
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v.attrs = &env2.bindings;
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/* The recursive attributes are evaluated in the new
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environment. */
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ATerm name, e2, pos;
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for (ATermIterator i(rbnds); i; ++i) {
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if (!matchBind(*i, name, e2, pos)) abort(); /* can't happen */
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Value & v2 = env2.bindings[name];
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nrValues++;
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mkThunk(v2, env2, e2);
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}
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/* The non-recursive attributes, on the other hand, are
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evaluated in the original environment. */
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for (ATermIterator i(nrbnds); i; ++i) {
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if (!matchBind(*i, name, e2, pos)) abort(); /* can't happen */
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Value & v2 = env2.bindings[name];
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nrValues++;
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mkThunk(v2, env, e2);
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}
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}
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else if (matchSelect(e, e2, name)) {
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Value v2;
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eval(env, e2, v2);
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forceAttrs(v2); // !!! eval followed by force is slightly inefficient
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Bindings::iterator i = v2.attrs->find(name);
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if (i == v2.attrs->end())
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throwEvalError("attribute `%1%' missing", aterm2String(name));
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try {
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forceValue(i->second);
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} catch (Error & e) {
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addErrorPrefix(e, "while evaluating the attribute `%1%':\n", aterm2String(name));
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throw;
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}
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v = i->second;
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}
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else if (matchFunction(e, pat, body, pos)) {
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v.type = tLambda;
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v.lambda.env = &env;
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v.lambda.pat = pat;
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v.lambda.body = body;
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}
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else if (matchCall(e, fun, arg)) {
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Value vFun;
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eval(env, fun, vFun);
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Value vArg;
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mkThunk(vArg, env, arg); // !!! should this be on the heap?
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callFunction(vFun, vArg, v);
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}
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else if (matchWith(e, attrs, body, pos)) {
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Env & env2(allocEnv());
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env2.up = &env;
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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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forceAttrs(vAttrs);
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eval(env2, body, v);
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}
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else if (matchList(e, es)) {
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mkList(v, ATgetLength(es));
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for (unsigned int n = 0; n < v.list.length; ++n, es = ATgetNext(es))
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mkThunk(v.list.elems[n], env, ATgetFirst(es));
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}
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else if (matchOpEq(e, e1, e2)) {
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Value v1; eval(env, e1, v1);
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Value v2; eval(env, e2, v2);
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mkBool(v, eqValues(v1, v2));
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}
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else if (matchOpNEq(e, e1, e2)) {
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Value v1; eval(env, e1, v1);
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Value v2; eval(env, e2, v2);
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mkBool(v, !eqValues(v1, v2));
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}
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else if (matchOpConcat(e, e1, e2)) {
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Value v1; eval(env, e1, v1);
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forceList(v1);
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Value v2; eval(env, e2, v2);
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forceList(v2);
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mkList(v, v1.list.length + v2.list.length);
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/* !!! This loses sharing with the original lists. We could
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use a tCopy node, but that would use more memory. */
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for (unsigned int n = 0; n < v1.list.length; ++n)
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v.list.elems[n] = v1.list.elems[n];
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for (unsigned int n = 0; n < v2.list.length; ++n)
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v.list.elems[n + v1.list.length] = v2.list.elems[n];
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}
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else if (matchConcatStrings(e, es)) {
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PathSet context;
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std::ostringstream s;
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@ -521,10 +389,6 @@ void EvalState::eval(Env & env, Expr e, Value & v)
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mkString(v, s.str(), context);
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}
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/* Conditionals. */
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else if (matchIf(e, e1, e2, e3))
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eval(env, evalBool(env, e1) ? e2 : e3, v);
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/* Assertions. */
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else if (matchAssert(e, e1, e2, pos)) {
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if (!evalBool(env, e1))
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@ -536,30 +400,6 @@ void EvalState::eval(Env & env, Expr e, Value & v)
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else if (matchOpNot(e, e1))
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mkBool(v, !evalBool(env, e1));
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/* Implication. */
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else if (matchOpImpl(e, e1, e2))
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return mkBool(v, !evalBool(env, e1) || evalBool(env, e2));
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/* Conjunction (logical AND). */
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else if (matchOpAnd(e, e1, e2))
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mkBool(v, evalBool(env, e1) && evalBool(env, e2));
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/* Disjunction (logical OR). */
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else if (matchOpOr(e, e1, e2))
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mkBool(v, evalBool(env, e1) || evalBool(env, e2));
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/* Attribute set update (//). */
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else if (matchOpUpdate(e, e1, e2)) {
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Value v2;
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eval(env, e1, v2);
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cloneAttrs(v2, v);
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eval(env, e2, v2);
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foreach (Bindings::iterator, i, *v2.attrs)
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(*v.attrs)[i->first] = i->second; // !!! sharing
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}
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/* Attribute existence test (?). */
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else if (matchOpHasAttr(e, e1, name)) {
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Value vAttrs;
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@ -567,8 +407,130 @@ void EvalState::eval(Env & env, Expr e, Value & v)
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forceAttrs(vAttrs);
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mkBool(v, vAttrs.attrs->find(name) != vAttrs.attrs->end());
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}
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#endif
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}
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else abort();
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void EvalState::eval(Expr * e, Value & v)
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{
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eval(baseEnv, e, v);
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}
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bool EvalState::evalBool(Env & env, Expr * e)
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{
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Value v;
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eval(env, e, v);
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if (v.type != tBool)
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throwTypeError("value is %1% while a Boolean was expected", showType(v));
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return v.boolean;
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}
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void ExprInt::eval(EvalState & state, Env & env, Value & v)
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{
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mkInt(v, n);
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}
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void ExprString::eval(EvalState & state, Env & env, Value & v)
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{
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mkString(v, s.c_str());
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}
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void ExprPath::eval(EvalState & state, Env & env, Value & v)
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{
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mkPath(v, s.c_str());
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}
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void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
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{
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if (recursive) {
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/* Create a new environment that contains the attributes in
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this `rec'. */
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Env & env2(state.allocEnv());
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env2.up = &env;
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v.type = tAttrs;
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v.attrs = &env2.bindings;
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/* The recursive attributes are evaluated in the new
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environment. */
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foreach (Attrs::iterator, i, attrs) {
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Value & v2 = env2.bindings[i->first];
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mkThunk(v2, env2, i->second);
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}
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/* The inherited attributes, on the other hand, are
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evaluated in the original environment. */
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foreach (list<string>::iterator, i, inherited) {
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Value & v2 = env2.bindings[*i];
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mkCopy(v2, *lookupVar(&env, *i));
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}
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}
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else {
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state.mkAttrs(v);
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foreach (Attrs::iterator, i, attrs) {
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Value & v2 = (*v.attrs)[i->first];
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mkThunk(v2, env, i->second);
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}
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}
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}
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void ExprList::eval(EvalState & state, Env & env, Value & v)
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{
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state.mkList(v, elems.size());
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for (unsigned int n = 0; n < v.list.length; ++n)
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mkThunk(v.list.elems[n], env, elems[n]);
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}
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void ExprVar::eval(EvalState & state, Env & env, Value & v)
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{
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Value * v2 = lookupVar(&env, name);
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state.forceValue(*v2);
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v = *v2;
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}
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void ExprSelect::eval(EvalState & state, Env & env, Value & v)
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{
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Value v2;
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state.eval(env, e, v2);
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state.forceAttrs(v2); // !!! eval followed by force is slightly inefficient
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Bindings::iterator i = v2.attrs->find(name);
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if (i == v2.attrs->end())
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throwEvalError("attribute `%1%' missing", name);
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try {
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state.forceValue(i->second);
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} catch (Error & e) {
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addErrorPrefix(e, "while evaluating the attribute `%1%':\n", name);
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throw;
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}
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v = i->second;
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}
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void ExprLambda::eval(EvalState & state, Env & env, Value & v)
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{
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v.type = tLambda;
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v.lambda.env = &env;
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v.lambda.fun = this;
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}
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void ExprApp::eval(EvalState & state, Env & env, Value & v)
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{
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Value vFun;
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state.eval(env, e1, vFun);
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Value vArg;
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mkThunk(vArg, env, e2); // !!! should this be on the heap?
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state.callFunction(vFun, vArg, v);
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}
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@ -613,19 +575,17 @@ void EvalState::callFunction(Value & fun, Value & arg, Value & v)
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Env & env2(allocEnv());
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env2.up = fun.lambda.env;
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ATermList formals; ATerm ellipsis, name;
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if (matchVarPat(fun.lambda.pat, name)) {
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Value & vArg = env2.bindings[name];
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if (!fun.lambda.fun->matchAttrs) {
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Value & vArg = env2.bindings[fun.lambda.fun->arg];
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nrValues++;
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vArg = arg;
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}
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else if (matchAttrsPat(fun.lambda.pat, formals, ellipsis, name)) {
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else {
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forceAttrs(arg);
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|
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if (name != sNoAlias) {
|
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env2.bindings[name] = arg;
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if (!fun.lambda.fun->arg.empty()) {
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env2.bindings[fun.lambda.fun->arg] = arg;
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nrValues++;
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}
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|
@ -633,21 +593,15 @@ void EvalState::callFunction(Value & fun, Value & arg, Value & v)
|
|||
there is no matching actual argument but the formal
|
||||
argument has a default, use the default. */
|
||||
unsigned int attrsUsed = 0;
|
||||
for (ATermIterator i(formals); i; ++i) {
|
||||
Expr def; Sym name;
|
||||
DefaultValue def2;
|
||||
if (!matchFormal(*i, name, def2)) abort(); /* can't happen */
|
||||
|
||||
Bindings::iterator j = arg.attrs->find(name);
|
||||
foreach (Formals::Formals_::iterator, i, fun.lambda.fun->formals->formals) {
|
||||
Bindings::iterator j = arg.attrs->find(i->name);
|
||||
|
||||
Value & v = env2.bindings[name];
|
||||
Value & v = env2.bindings[i->name];
|
||||
nrValues++;
|
||||
|
||||
if (j == arg.attrs->end()) {
|
||||
if (!matchDefaultValue(def2, def)) def = 0;
|
||||
if (def == 0) throwTypeError("the argument named `%1%' required by the function is missing",
|
||||
aterm2String(name));
|
||||
mkThunk(v, env2, def);
|
||||
if (!i->def) throwTypeError("the argument named `%1%' required by the function is missing", i->name);
|
||||
mkThunk(v, env2, i->def);
|
||||
} else {
|
||||
attrsUsed++;
|
||||
mkCopy(v, j->second);
|
||||
|
|
@ -658,13 +612,11 @@ void EvalState::callFunction(Value & fun, Value & arg, Value & v)
|
|||
argument (unless the attribute match specifies a `...').
|
||||
TODO: show the names of the expected/unexpected
|
||||
arguments. */
|
||||
if (ellipsis == eFalse && attrsUsed != arg.attrs->size())
|
||||
if (!fun.lambda.fun->formals->ellipsis && attrsUsed != arg.attrs->size())
|
||||
throwTypeError("function called with unexpected argument");
|
||||
}
|
||||
|
||||
else abort();
|
||||
|
||||
eval(env2, fun.lambda.body, v);
|
||||
eval(env2, fun.lambda.fun->body, v);
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -672,45 +624,114 @@ void EvalState::autoCallFunction(const Bindings & args, Value & fun, Value & res
|
|||
{
|
||||
forceValue(fun);
|
||||
|
||||
ATerm name;
|
||||
ATermList formals;
|
||||
ATermBool ellipsis;
|
||||
|
||||
if (fun.type != tLambda || !matchAttrsPat(fun.lambda.pat, formals, ellipsis, name)) {
|
||||
if (fun.type != tLambda || !fun.lambda.fun->matchAttrs) {
|
||||
res = fun;
|
||||
return;
|
||||
}
|
||||
|
||||
Value actualArgs;
|
||||
mkAttrs(actualArgs);
|
||||
|
||||
for (ATermIterator i(formals); i; ++i) {
|
||||
Expr name, def; ATerm def2;
|
||||
if (!matchFormal(*i, name, def2)) abort();
|
||||
Bindings::const_iterator j = args.find(name);
|
||||
|
||||
foreach (Formals::Formals_::iterator, i, fun.lambda.fun->formals->formals) {
|
||||
Bindings::const_iterator j = args.find(i->name);
|
||||
if (j != args.end())
|
||||
(*actualArgs.attrs)[name] = j->second;
|
||||
else if (!matchDefaultValue(def2, def))
|
||||
throwTypeError("cannot auto-call a function that has an argument without a default value (`%1%')", aterm2String(name));
|
||||
(*actualArgs.attrs)[i->name] = j->second;
|
||||
else if (!i->def)
|
||||
throwTypeError("cannot auto-call a function that has an argument without a default value (`%1%')", i->name);
|
||||
}
|
||||
|
||||
callFunction(fun, actualArgs, res);
|
||||
}
|
||||
|
||||
|
||||
void EvalState::eval(Expr e, Value & v)
|
||||
void ExprWith::eval(EvalState & state, Env & env, Value & v)
|
||||
{
|
||||
eval(baseEnv, e, v);
|
||||
Env & env2(state.allocEnv());
|
||||
env2.up = &env;
|
||||
|
||||
Value & vAttrs = env2.bindings["<with>"];
|
||||
state.eval(env, attrs, vAttrs);
|
||||
state.forceAttrs(vAttrs);
|
||||
|
||||
state.eval(env2, body, v);
|
||||
}
|
||||
|
||||
|
||||
bool EvalState::evalBool(Env & env, Expr e)
|
||||
void ExprIf::eval(EvalState & state, Env & env, Value & v)
|
||||
{
|
||||
Value v;
|
||||
eval(env, e, v);
|
||||
if (v.type != tBool)
|
||||
throwTypeError("value is %1% while a Boolean was expected", showType(v));
|
||||
return v.boolean;
|
||||
state.eval(env, state.evalBool(env, cond) ? then : else_, v);
|
||||
}
|
||||
|
||||
|
||||
void ExprOpEq::eval(EvalState & state, Env & env, Value & v)
|
||||
{
|
||||
Value v1; state.eval(env, e1, v1);
|
||||
Value v2; state.eval(env, e2, v2);
|
||||
mkBool(v, state.eqValues(v1, v2));
|
||||
}
|
||||
|
||||
|
||||
void ExprOpNEq::eval(EvalState & state, Env & env, Value & v)
|
||||
{
|
||||
Value v1; state.eval(env, e1, v1);
|
||||
Value v2; state.eval(env, e2, v2);
|
||||
mkBool(v, !state.eqValues(v1, v2));
|
||||
}
|
||||
|
||||
|
||||
void ExprOpAnd::eval(EvalState & state, Env & env, Value & v)
|
||||
{
|
||||
mkBool(v, state.evalBool(env, e1) && state.evalBool(env, e2));
|
||||
}
|
||||
|
||||
|
||||
void ExprOpOr::eval(EvalState & state, Env & env, Value & v)
|
||||
{
|
||||
mkBool(v, state.evalBool(env, e1) || state.evalBool(env, e2));
|
||||
}
|
||||
|
||||
|
||||
void ExprOpImpl::eval(EvalState & state, Env & env, Value & v)
|
||||
{
|
||||
mkBool(v, !state.evalBool(env, e1) || state.evalBool(env, e2));
|
||||
}
|
||||
|
||||
|
||||
void ExprOpUpdate::eval(EvalState & state, Env & env, Value & v)
|
||||
{
|
||||
Value v2;
|
||||
state.eval(env, e1, v2);
|
||||
state.forceAttrs(v2);
|
||||
|
||||
state.cloneAttrs(v2, v);
|
||||
|
||||
state.eval(env, e2, v2);
|
||||
state.forceAttrs(v2);
|
||||
|
||||
foreach (Bindings::iterator, i, *v2.attrs)
|
||||
(*v.attrs)[i->first] = i->second; // !!! sharing
|
||||
}
|
||||
|
||||
|
||||
void ExprOpConcatStrings::eval(EvalState & state, Env & env, Value & v)
|
||||
{
|
||||
abort();
|
||||
}
|
||||
|
||||
|
||||
void ExprOpConcatLists::eval(EvalState & state, Env & env, Value & v)
|
||||
{
|
||||
Value v1; state.eval(env, e1, v1);
|
||||
state.forceList(v1);
|
||||
Value v2; state.eval(env, e2, v2);
|
||||
state.forceList(v2);
|
||||
state.mkList(v, v1.list.length + v2.list.length);
|
||||
/* !!! This loses sharing with the original lists. We could use a
|
||||
tCopy node, but that would use more memory. */
|
||||
for (unsigned int n = 0; n < v1.list.length; ++n)
|
||||
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];
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -827,7 +848,7 @@ string EvalState::forceStringNoCtx(Value & v)
|
|||
bool EvalState::isDerivation(Value & v)
|
||||
{
|
||||
if (v.type != tAttrs) return false;
|
||||
Bindings::iterator i = v.attrs->find(toATerm("type"));
|
||||
Bindings::iterator i = v.attrs->find("type");
|
||||
return i != v.attrs->end() && forceStringNoCtx(i->second) == "derivation";
|
||||
}
|
||||
|
||||
|
|
@ -871,7 +892,7 @@ string EvalState::coerceToString(Value & v, PathSet & context,
|
|||
}
|
||||
|
||||
if (v.type == tAttrs) {
|
||||
Bindings::iterator i = v.attrs->find(toATerm("outPath"));
|
||||
Bindings::iterator i = v.attrs->find("outPath");
|
||||
if (i == v.attrs->end())
|
||||
throwTypeError("cannot coerce an attribute set (except a derivation) to a string");
|
||||
return coerceToString(i->second, context, coerceMore, copyToStore);
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue