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https://github.com/NixOS/nix
synced 2025-07-07 10:11:47 +02:00
* Working evaluator.
* Mutually recursive attribute sets. * Print evaluator efficiency statistics.
This commit is contained in:
Eelco Dolstra
parent
f1c1a3c97f
commit
9210d4d530
10 changed files with 540 additions and 309 deletions
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@ -8,7 +8,6 @@
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#include "eval.hh"
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#if 0
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#if 0
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static Path searchPath(const Paths & searchDirs, const Path & relPath)
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{
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@ -28,178 +27,9 @@ static Path searchPath(const Paths & searchDirs, const Path & relPath)
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#endif
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static Expr substExpr(string x, Expr rep, Expr e)
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{
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char * s;
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Expr e2;
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if (ATmatch(e, "Var(<str>)", &s))
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if (x == s)
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return rep;
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else
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return e;
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ATermList formals;
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if (ATmatch(e, "Function([<list>], <term>)", &formals, &e2)) {
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while (!ATisEmpty(formals)) {
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if (!ATmatch(ATgetFirst(formals), "<str>", &s))
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throw badTerm("not a list of formals", (ATerm) formals);
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if (x == (string) s)
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return e;
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formals = ATgetNext(formals);
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}
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}
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/* Generically substitute in subterms. */
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if (ATgetType(e) == AT_APPL) {
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AFun fun = ATgetAFun(e);
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int arity = ATgetArity(fun);
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ATermList args = ATempty;
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for (int i = arity - 1; i >= 0; i--)
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args = ATinsert(args, substExpr(x, rep, ATgetArgument(e, i)));
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return (ATerm) ATmakeApplList(fun, args);
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}
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if (ATgetType(e) == AT_LIST) {
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ATermList in = (ATermList) e;
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ATermList out = ATempty;
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while (!ATisEmpty(in)) {
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out = ATinsert(out, substExpr(x, rep, ATgetFirst(in)));
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in = ATgetNext(in);
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}
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return (ATerm) ATreverse(out);
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}
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throw badTerm("do not know how to substitute", e);
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}
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static Expr substExprMany(ATermList formals, ATermList args, Expr body)
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{
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char * s;
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Expr e;
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/* !!! check args against formals */
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while (!ATisEmpty(args)) {
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ATerm tup = ATgetFirst(args);
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if (!ATmatch(tup, "(<str>, <term>)", &s, &e))
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throw badTerm("expected an argument tuple", tup);
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body = substExpr(s, e, body);
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args = ATgetNext(args);
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}
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return body;
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}
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static PathSet nixExprRootsCached(EvalState & state, const Path & nePath)
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{
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PkgPaths::iterator i = state.pkgPaths.find(nePath);
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if (i != state.pkgPaths.end())
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return i->second;
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else {
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PathSet paths = nixExprRoots(nePath);
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state.pkgPaths[nePath] = paths;
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return paths;
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}
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}
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static Hash hashPackage(EvalState & state, NixExpr ne)
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{
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if (ne.type == NixExpr::neDerivation) {
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PathSet inputs2;
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for (PathSet::iterator i = ne.derivation.inputs.begin();
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i != ne.derivation.inputs.end(); i++)
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{
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PkgHashes::iterator j = state.pkgHashes.find(*i);
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if (j == state.pkgHashes.end())
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throw Error(format("don't know expression `%1%'") % (string) *i);
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inputs2.insert(j->second);
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}
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ne.derivation.inputs = inputs2;
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}
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return hashTerm(unparseNixExpr(ne));
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}
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static string processBinding(EvalState & state, Expr e, NixExpr & ne)
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{
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char * s1;
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if (ATmatch(e, "NixExpr(<str>)", &s1)) {
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Path nePath(s1);
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PathSet paths = nixExprRootsCached(state, nePath);
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if (paths.size() != 1) abort();
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Path path = *(paths.begin());
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ne.derivation.inputs.insert(nePath);
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return path;
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}
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if (ATmatch(e, "<str>", &s1))
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return s1;
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if (ATmatch(e, "True")) return "1";
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if (ATmatch(e, "False")) return "";
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ATermList l;
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if (ATmatch(e, "[<list>]", &l)) {
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string s;
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bool first = true;
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while (!ATisEmpty(l)) {
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if (!first) s = s + " "; else first = false;
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s += processBinding(state, evalExpr(state, ATgetFirst(l)), ne);
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l = ATgetNext(l);
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}
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return s;
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}
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throw badTerm("invalid package binding", e);
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}
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#if 0
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static Expr evalExpr2(EvalState & state, Expr e)
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{
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char * s1;
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Expr e1, e2, e3, e4;
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ATermList bnds;
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/* Normal forms. */
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if (ATmatch(e, "<str>", &s1) ||
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ATmatch(e, "[<list>]", &e1) ||
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ATmatch(e, "True") ||
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ATmatch(e, "False") ||
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ATmatch(e, "Function([<list>], <term>)", &e1, &e2) ||
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ATmatch(e, "NixExpr(<str>)", &s1))
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return e;
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try {
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Hash pkgHash = hashPackage(state, parseNixExpr(e));
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Path pkgPath = writeTerm(e, "");
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state.pkgHashes[pkgPath] = pkgHash;
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return ATmake("NixExpr(<str>)", pkgPath.c_str());
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} catch (...) { /* !!! catch parse errors only */
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}
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/* Application. */
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if (ATmatch(e, "Call(<term>, [<list>])", &e1, &e2) ||
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ATmatch(e, "App(<term>, [<list>])", &e1, &e2)) {
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e1 = evalExpr(state, e1);
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if (!ATmatch(e1, "Function([<list>], <term>)", &e3, &e4))
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throw badTerm("expecting a function", e1);
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return evalExpr(state,
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substExprMany((ATermList) e3, (ATermList) e2, e4));
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}
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/* Conditional. */
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if (ATmatch(e, "If(<term>, <term>, <term>)", &e1, &e2, &e3)) {
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e1 = evalExpr(state, e1);
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@ -226,127 +56,6 @@ static Expr evalExpr2(EvalState & state, Expr e)
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ATmake("True") : ATmake("False");
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}
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/* Platform constant. */
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if (ATmatch(e, "Platform")) {
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return ATmake("<str>", thisSystem.c_str());
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}
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/* Fix inclusion. */
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if (ATmatch(e, "IncludeFix(<str>)", &s1)) {
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Path fileName(s1);
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return evalFile(state, s1);
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}
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/* Relative files. */
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if (ATmatch(e, "Relative(<str>)", &s1)) {
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Path srcPath = s1;
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Path dstPath = addToStore(srcPath);
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ClosureElem elem;
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NixExpr ne;
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ne.type = NixExpr::neClosure;
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ne.closure.roots.insert(dstPath);
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ne.closure.elems[dstPath] = elem;
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Hash pkgHash = hashPackage(state, ne);
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Path pkgPath = writeTerm(unparseNixExpr(ne), "");
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state.pkgHashes[pkgPath] = pkgHash;
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msg(lvlChatty, format("copied `%1%' -> closure `%2%'")
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% srcPath % pkgPath);
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return ATmake("NixExpr(<str>)", pkgPath.c_str());
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}
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/* Packages are transformed into Nix derivation expressions. */
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if (ATmatch(e, "Package([<list>])", &bnds)) {
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/* Evaluate the bindings and put them in a map. */
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map<string, ATerm> bndMap;
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bndMap["platform"] = ATmake("<str>", thisSystem.c_str());
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while (!ATisEmpty(bnds)) {
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ATerm bnd = ATgetFirst(bnds);
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if (!ATmatch(bnd, "(<str>, <term>)", &s1, &e1))
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throw badTerm("binding expected", bnd);
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bndMap[s1] = evalExpr(state, e1);
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bnds = ATgetNext(bnds);
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}
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/* Gather information for building the derivation
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expression. */
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NixExpr ne;
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ne.type = NixExpr::neDerivation;
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ne.derivation.platform = thisSystem;
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string name;
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Path outPath;
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Hash outHash;
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bool outHashGiven = false;
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bnds = ATempty;
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for (map<string, ATerm>::iterator it = bndMap.begin();
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it != bndMap.end(); it++)
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{
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string key = it->first;
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ATerm value = it->second;
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if (key == "args") {
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ATermList args;
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if (!ATmatch(value, "[<list>]", &args))
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throw badTerm("list expected", value);
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while (!ATisEmpty(args)) {
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Expr arg = evalExpr(state, ATgetFirst(args));
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ne.derivation.args.push_back(processBinding(state, arg, ne));
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args = ATgetNext(args);
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}
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}
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else {
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string s = processBinding(state, value, ne);
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ne.derivation.env[key] = s;
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if (key == "build") ne.derivation.builder = s;
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if (key == "name") name = s;
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if (key == "outPath") outPath = s;
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if (key == "id") {
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outHash = parseHash(s);
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outHashGiven = true;
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}
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}
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bnds = ATinsert(bnds,
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ATmake("(<str>, <term>)", key.c_str(), value));
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}
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if (ne.derivation.builder == "")
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throw badTerm("no builder specified", e);
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if (name == "")
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throw badTerm("no package name specified", e);
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/* Determine the output path. */
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if (!outHashGiven) outHash = hashPackage(state, ne);
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if (outPath == "")
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/* Hash the Nix expression with no outputs to produce a
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unique but deterministic path name for this package. */
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outPath =
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canonPath(nixStore + "/" + ((string) outHash).c_str() + "-" + name);
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ne.derivation.env["out"] = outPath;
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ne.derivation.outputs.insert(outPath);
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/* Write the resulting term into the Nix store directory. */
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Hash pkgHash = outHashGiven
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? hashString((string) outHash + outPath)
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: hashPackage(state, ne);
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Path pkgPath = writeTerm(unparseNixExpr(ne), "-d-" + name);
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state.pkgHashes[pkgPath] = pkgHash;
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msg(lvlChatty, format("instantiated `%1%' -> `%2%'")
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% name % pkgPath);
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return ATmake("NixExpr(<str>)", pkgPath.c_str());
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}
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/* BaseName primitive function. */
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if (ATmatch(e, "BaseName(<term>)", &e1)) {
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e1 = evalExpr(state, e1);
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@ -355,8 +64,6 @@ static Expr evalExpr2(EvalState & state, Expr e)
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return ATmake("<str>", baseNameOf(s1).c_str());
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}
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/* Barf. */
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throw badTerm("invalid expression", e);
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}
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#endif
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@ -374,17 +81,27 @@ static Expr evalStdin(EvalState & state)
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static void printNixExpr(EvalState & state, Expr e)
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{
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ATermList es;
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char * s;
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if (ATmatch(e, "NixExpr(<str>)", &s)) {
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cout << format("%1%\n") % s;
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}
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else if (ATmatch(e, "[<list>]", &es)) {
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if (ATmatch(e, "Attrs([<list>])", &es)) {
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Expr a = queryAttr(e, "type");
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if (a && evalString(state, a) == "derivation") {
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a = queryAttr(e, "drvPath");
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if (a) {
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cout << format("%1%\n") % evalPath(state, a);
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return;
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}
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}
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}
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if (ATmatch(e, "[<list>]", &es)) {
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while (!ATisEmpty(es)) {
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printNixExpr(state, evalExpr(state, ATgetFirst(es)));
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es = ATgetNext(es);
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}
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return;
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}
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else throw badTerm("top level does not evaluate to a (list of) Nix expression(s)", e);
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throw badTerm("top level does not evaluate to one or more Nix expressions", e);
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}
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@ -435,6 +152,8 @@ void run(Strings args)
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Expr e = evalFile(state, absPath(*it));
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printNixExpr(state, e);
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}
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printEvalStats(state);
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}
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