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-rw-r--r--src/fix-ng/Makefile.am2
-rw-r--r--src/fix-ng/eval.cc162
-rw-r--r--src/fix-ng/eval.hh19
-rw-r--r--src/fix-ng/fix-expr.cc93
-rw-r--r--src/fix-ng/fix-expr.hh20
-rw-r--r--src/fix-ng/fix.cc319
-rw-r--r--src/fix-ng/fix.sdf4
-rw-r--r--src/fix-ng/parser.cc2
-rw-r--r--src/fix-ng/primops.cc206
-rw-r--r--src/fix-ng/primops.hh22
10 files changed, 540 insertions, 309 deletions
diff --git a/src/fix-ng/Makefile.am b/src/fix-ng/Makefile.am
index b0e90450e..359e39c46 100644
--- a/src/fix-ng/Makefile.am
+++ b/src/fix-ng/Makefile.am
@@ -1,6 +1,6 @@
bin_PROGRAMS = fix-ng
-fix_ng_SOURCES = fix-expr.cc parser.cc eval.cc fix.cc
+fix_ng_SOURCES = fix-expr.cc parser.cc eval.cc primops.cc fix.cc
fix_ng_LDADD = ../libmain/libmain.a ../libnix/libnix.a ../boost/format/libformat.a \
-L../../externals/inst/lib -ldb_cxx -lsglr -lATB -lconversion -lasfix2 -lmept -lATerm
diff --git a/src/fix-ng/eval.cc b/src/fix-ng/eval.cc
index c0f4680a4..785467741 100644
--- a/src/fix-ng/eval.cc
+++ b/src/fix-ng/eval.cc
@@ -1,18 +1,167 @@
#include "eval.hh"
#include "expr.hh"
#include "parser.hh"
+#include "primops.hh"
EvalState::EvalState()
{
blackHole = ATmake("BlackHole()");
if (!blackHole) throw Error("cannot build black hole");
+ nrEvaluated = nrCached = 0;
+}
+
+
+Expr getAttr(EvalState & state, Expr e, const string & name)
+{
+}
+
+
+/* Substitute an argument set into the body of a function. */
+static Expr substArgs(Expr body, ATermList formals, Expr arg)
+{
+ Subs subs;
+ Expr undefined = ATmake("Undefined");
+
+ /* Get the formal arguments. */
+ while (!ATisEmpty(formals)) {
+ char * s;
+ if (!ATmatch(ATgetFirst(formals), "<str>", &s))
+ abort(); /* can't happen */
+ subs[s] = undefined;
+ formals = ATgetNext(formals);
+ }
+
+ /* Get the actual arguments, and check that they match with the
+ formals. */
+ Attrs args;
+ queryAllAttrs(arg, args);
+ for (Attrs::iterator i = args.begin(); i != args.end(); i++) {
+ if (subs.find(i->first) == subs.end())
+ throw badTerm(format("argument `%1%' not declared") % i->first, arg);
+ subs[i->first] = i->second;
+ }
+
+ /* Check that all arguments are defined. */
+ for (Subs::iterator i = subs.begin(); i != subs.end(); i++)
+ if (i->second == undefined)
+ throw badTerm(format("formal argument `%1%' missing") % i->first, arg);
+
+ return substitute(subs, body);
+}
+
+
+/* Transform a mutually recursive set into a non-recursive set. Each
+ attribute is transformed into an expression that has all references
+ to attributes substituted with selection expressions on the
+ original set. E.g., e = `rec {x = f x y, y = x}' becomes `{x = f
+ (e.x) (e.y), y = e.x}'. */
+ATerm expandRec(ATerm e, ATermList bnds)
+{
+ /* Create the substitution list. */
+ Subs subs;
+ ATermList bs = bnds;
+ while (!ATisEmpty(bs)) {
+ char * s;
+ Expr e2;
+ if (!ATmatch(ATgetFirst(bs), "Bind(<str>, <term>)", &s, &e2))
+ abort(); /* can't happen */
+ subs[s] = ATmake("Select(<term>, <str>)", e, s);
+ bs = ATgetNext(bs);
+ }
+
+ /* Create the non-recursive set. */
+ Attrs as;
+ bs = bnds;
+ while (!ATisEmpty(bs)) {
+ char * s;
+ Expr e2;
+ if (!ATmatch(ATgetFirst(bs), "Bind(<str>, <term>)", &s, &e2))
+ abort(); /* can't happen */
+ as[s] = substitute(subs, e2);
+ bs = ATgetNext(bs);
+ }
+
+ return makeAttrs(as);
+}
+
+
+string evalString(EvalState & state, Expr e)
+{
+ e = evalExpr(state, e);
+ char * s;
+ if (!ATmatch(e, "Str(<str>)", &s))
+ throw badTerm("string expected", e);
+ return s;
+}
+
+
+Path evalPath(EvalState & state, Expr e)
+{
+ e = evalExpr(state, e);
+ char * s;
+ if (!ATmatch(e, "Path(<str>)", &s))
+ throw badTerm("path expected", e);
+ return s;
}
Expr evalExpr2(EvalState & state, Expr e)
{
- return e;
+ Expr e1, e2, e3, e4;
+ char * s1;
+
+ /* Normal forms. */
+ if (ATmatch(e, "Str(<str>)", &s1) ||
+ ATmatch(e, "Path(<str>)", &s1) ||
+ ATmatch(e, "Uri(<str>)", &s1) ||
+ ATmatch(e, "Function([<list>], <term>)", &e1, &e2) ||
+ ATmatch(e, "Attrs([<list>])", &e1) ||
+ ATmatch(e, "List([<list>])", &e1))
+ return e;
+
+ /* Any encountered variables must be undeclared or primops. */
+ if (ATmatch(e, "Var(<str>)", &s1)) {
+ return e;
+ }
+
+ /* Function application. */
+ if (ATmatch(e, "Call(<term>, <term>)", &e1, &e2)) {
+
+ /* Evaluate the left-hand side. */
+ e1 = evalExpr(state, e1);
+
+ /* Is it a primop or a function? */
+ if (ATmatch(e1, "Var(<str>)", &s1)) {
+ string primop(s1);
+ if (primop == "import") return primImport(state, e2);
+ if (primop == "derivation") return primDerivation(state, e2);
+ else throw badTerm("undefined variable/primop", e1);
+ }
+
+ else if (ATmatch(e1, "Function([<list>], <term>)", &e3, &e4)) {
+ return evalExpr(state,
+ substArgs(e4, (ATermList) e3, evalExpr(state, e2)));
+ }
+
+ else throw badTerm("expecting a function or primop", e1);
+ }
+
+ /* Attribute selection. */
+ if (ATmatch(e, "Select(<term>, <str>)", &e1, &s1)) {
+ string name(s1);
+ Expr a = queryAttr(evalExpr(state, e1), name);
+ if (!a) throw badTerm(format("missing attribute `%1%'") % name, e);
+ return evalExpr(state, a);
+ }
+
+ /* Mutually recursive sets. */
+ ATermList bnds;
+ if (ATmatch(e, "Rec([<list>])", &bnds))
+ return expandRec(e, (ATermList) bnds);
+
+ /* Barf. */
+ throw badTerm("invalid expression", e);
}
@@ -20,12 +169,15 @@ Expr evalExpr(EvalState & state, Expr e)
{
Nest nest(lvlVomit, format("evaluating expression: %1%") % printTerm(e));
+ state.nrEvaluated++;
+
/* Consult the memo table to quickly get the normal form of
previously evaluated expressions. */
NormalForms::iterator i = state.normalForms.find(e);
if (i != state.normalForms.end()) {
if (i->second == state.blackHole)
throw badTerm("infinite recursion", e);
+ state.nrCached++;
return i->second;
}
@@ -43,3 +195,11 @@ Expr evalFile(EvalState & state, const Path & path)
Expr e = parseExprFromFile(path);
return evalExpr(state, e);
}
+
+
+void printEvalStats(EvalState & state)
+{
+ debug(format("evaluated %1% expressions, %2% cache hits, %3%%% efficiency")
+ % state.nrEvaluated % state.nrCached
+ % ((float) state.nrCached / (float) state.nrEvaluated * 100));
+}
diff --git a/src/fix-ng/eval.hh b/src/fix-ng/eval.hh
index 5fcb648a7..364f28471 100644
--- a/src/fix-ng/eval.hh
+++ b/src/fix-ng/eval.hh
@@ -4,19 +4,23 @@
#include <map>
#include "fix-expr.hh"
+#include "expr.hh"
typedef map<Expr, Expr> NormalForms;
-//typedef map<Path, PathSet> PkgPaths;
-//typedef map<Path, Hash> PkgHashes;
+typedef map<Path, PathSet> DrvPaths;
+typedef map<Path, Hash> DrvHashes;
struct EvalState
{
NormalForms normalForms;
- // PkgPaths pkgPaths;
- // PkgHashes pkgHashes; /* normalised package hashes */
+ DrvPaths drvPaths;
+ DrvHashes drvHashes; /* normalised derivation hashes */
Expr blackHole;
+ unsigned int nrEvaluated;
+ unsigned int nrCached;
+
EvalState();
};
@@ -27,5 +31,12 @@ Expr evalExpr(EvalState & state, Expr e);
/* Evaluate an expression read from the given file to normal form. */
Expr evalFile(EvalState & state, const Path & path);
+/* Specific results. */
+string evalString(EvalState & state, Expr e);
+Path evalPath(EvalState & state, Expr e);
+
+/* Print statistics. */
+void printEvalStats(EvalState & state);
+
#endif /* !__EVAL_H */
diff --git a/src/fix-ng/fix-expr.cc b/src/fix-ng/fix-expr.cc
index 8d47817ff..ff0b7d43d 100644
--- a/src/fix-ng/fix-expr.cc
+++ b/src/fix-ng/fix-expr.cc
@@ -31,3 +31,96 @@ ATerm bottomupRewrite(TermFun & f, ATerm e)
return e;
}
+
+
+void queryAllAttrs(Expr e, Attrs & attrs)
+{
+ ATermList bnds;
+ if (!ATmatch(e, "Attrs([<list>])", &bnds))
+ throw badTerm("expected attribute set", e);
+
+ while (!ATisEmpty(bnds)) {
+ char * s;
+ Expr e;
+ if (!ATmatch(ATgetFirst(bnds), "Bind(<str>, <term>)", &s, &e))
+ abort(); /* can't happen */
+ attrs[s] = e;
+ bnds = ATgetNext(bnds);
+ }
+}
+
+
+Expr queryAttr(Expr e, const string & name)
+{
+ Attrs attrs;
+ queryAllAttrs(e, attrs);
+ Attrs::iterator i = attrs.find(name);
+ return i == attrs.end() ? 0 : i->second;
+}
+
+
+Expr makeAttrs(const Attrs & attrs)
+{
+ ATermList bnds = ATempty;
+ for (Attrs::const_iterator i = attrs.begin(); i != attrs.end(); i++)
+ bnds = ATinsert(bnds,
+ ATmake("Bind(<str>, <term>)", i->first.c_str(), i->second));
+ return ATmake("Attrs(<term>)", ATreverse(bnds));
+}
+
+
+ATerm substitute(Subs & subs, ATerm e)
+{
+ char * s;
+
+ if (ATmatch(e, "Var(<str>)", &s)) {
+ Subs::iterator i = subs.find(s);
+ if (i == subs.end())
+ return e;
+ else
+ return i->second;
+ }
+
+ /* In case of a function, filter out all variables bound by this
+ function. */
+ ATermList formals;
+ ATerm body;
+ if (ATmatch(e, "Function([<list>], <term>)", &formals, &body)) {
+ Subs subs2(subs);
+ ATermList fs = formals;
+ while (!ATisEmpty(fs)) {
+ if (!ATmatch(ATgetFirst(fs), "<str>", &s)) abort();
+ subs2.erase(s);
+ fs = ATgetNext(fs);
+ }
+ return ATmake("Function(<term>, <term>)", formals,
+ substitute(subs2, body));
+ }
+
+ /* !!! Rec(...) */
+
+ if (ATgetType(e) == AT_APPL) {
+ AFun fun = ATgetAFun(e);
+ int arity = ATgetArity(fun);
+ ATermList args = ATempty;
+
+ for (int i = arity - 1; i >= 0; i--)
+ args = ATinsert(args, substitute(subs, ATgetArgument(e, i)));
+
+ return (ATerm) ATmakeApplList(fun, args);
+ }
+
+ if (ATgetType(e) == AT_LIST) {
+ ATermList in = (ATermList) e;
+ ATermList out = ATempty;
+
+ while (!ATisEmpty(in)) {
+ out = ATinsert(out, substitute(subs, ATgetFirst(in)));
+ in = ATgetNext(in);
+ }
+
+ return (ATerm) ATreverse(out);
+ }
+
+ return e;
+}
diff --git a/src/fix-ng/fix-expr.hh b/src/fix-ng/fix-expr.hh
index 5c50e9170..700f7beca 100644
--- a/src/fix-ng/fix-expr.hh
+++ b/src/fix-ng/fix-expr.hh
@@ -1,6 +1,8 @@
#ifndef __FIXEXPR_H
#define __FIXEXPR_H
+#include <map>
+
#include <aterm2.h>
#include "util.hh"
@@ -15,13 +17,27 @@ typedef ATerm Expr;
/* Generic bottomup traversal over ATerms. The traversal first
recursively descends into subterms, and then applies the given term
function to the resulting term. */
-
struct TermFun
{
virtual ATerm operator () (ATerm e) = 0;
};
-
ATerm bottomupRewrite(TermFun & f, ATerm e);
+/* Query all attributes in an attribute set expression. The
+ expression must be in normal form. */
+typedef map<string, Expr> Attrs;
+void queryAllAttrs(Expr e, Attrs & attrs);
+
+/* Query a specific attribute from an attribute set expression. The
+ expression must be in normal form. */
+Expr queryAttr(Expr e, const string & name);
+
+/* Create an attribute set expression from an Attrs value. */
+Expr makeAttrs(const Attrs & attrs);
+
+/* Perform a set of substitutions on an expression. */
+typedef map<string, Expr> Subs;
+ATerm substitute(Subs & subs, ATerm e);
+
#endif /* !__FIXEXPR_H */
diff --git a/src/fix-ng/fix.cc b/src/fix-ng/fix.cc
index fb98dc697..d791461bd 100644
--- a/src/fix-ng/fix.cc
+++ b/src/fix-ng/fix.cc
@@ -9,7 +9,6 @@
#if 0
-#if 0
static Path searchPath(const Paths & searchDirs, const Path & relPath)
{
if (string(relPath, 0, 1) == "/") return relPath;
@@ -28,178 +27,9 @@ static Path searchPath(const Paths & searchDirs, const Path & relPath)
#endif
-static Expr substExpr(string x, Expr rep, Expr e)
-{
- char * s;
- Expr e2;
-
- if (ATmatch(e, "Var(<str>)", &s))
- if (x == s)
- return rep;
- else
- return e;
-
- ATermList formals;
- if (ATmatch(e, "Function([<list>], <term>)", &formals, &e2)) {
- while (!ATisEmpty(formals)) {
- if (!ATmatch(ATgetFirst(formals), "<str>", &s))
- throw badTerm("not a list of formals", (ATerm) formals);
- if (x == (string) s)
- return e;
- formals = ATgetNext(formals);
- }
- }
-
- /* Generically substitute in subterms. */
-
- if (ATgetType(e) == AT_APPL) {
- AFun fun = ATgetAFun(e);
- int arity = ATgetArity(fun);
- ATermList args = ATempty;
-
- for (int i = arity - 1; i >= 0; i--)
- args = ATinsert(args, substExpr(x, rep, ATgetArgument(e, i)));
-
- return (ATerm) ATmakeApplList(fun, args);
- }
-
- if (ATgetType(e) == AT_LIST) {
- ATermList in = (ATermList) e;
- ATermList out = ATempty;
-
- while (!ATisEmpty(in)) {
- out = ATinsert(out, substExpr(x, rep, ATgetFirst(in)));
- in = ATgetNext(in);
- }
-
- return (ATerm) ATreverse(out);
- }
-
- throw badTerm("do not know how to substitute", e);
-}
-
-
-static Expr substExprMany(ATermList formals, ATermList args, Expr body)
-{
- char * s;
- Expr e;
-
- /* !!! check args against formals */
-
- while (!ATisEmpty(args)) {
- ATerm tup = ATgetFirst(args);
- if (!ATmatch(tup, "(<str>, <term>)", &s, &e))
- throw badTerm("expected an argument tuple", tup);
-
- body = substExpr(s, e, body);
-
- args = ATgetNext(args);
- }
-
- return body;
-}
-
-
-static PathSet nixExprRootsCached(EvalState & state, const Path & nePath)
-{
- PkgPaths::iterator i = state.pkgPaths.find(nePath);
- if (i != state.pkgPaths.end())
- return i->second;
- else {
- PathSet paths = nixExprRoots(nePath);
- state.pkgPaths[nePath] = paths;
- return paths;
- }
-}
-
-
-static Hash hashPackage(EvalState & state, NixExpr ne)
-{
- if (ne.type == NixExpr::neDerivation) {
- PathSet inputs2;
- for (PathSet::iterator i = ne.derivation.inputs.begin();
- i != ne.derivation.inputs.end(); i++)
- {
- PkgHashes::iterator j = state.pkgHashes.find(*i);
- if (j == state.pkgHashes.end())
- throw Error(format("don't know expression `%1%'") % (string) *i);
- inputs2.insert(j->second);
- }
- ne.derivation.inputs = inputs2;
- }
- return hashTerm(unparseNixExpr(ne));
-}
-
-
-static string processBinding(EvalState & state, Expr e, NixExpr & ne)
-{
- char * s1;
-
- if (ATmatch(e, "NixExpr(<str>)", &s1)) {
- Path nePath(s1);
- PathSet paths = nixExprRootsCached(state, nePath);
- if (paths.size() != 1) abort();
- Path path = *(paths.begin());
- ne.derivation.inputs.insert(nePath);
- return path;
- }
-
- if (ATmatch(e, "<str>", &s1))
- return s1;
-
- if (ATmatch(e, "True")) return "1";
-
- if (ATmatch(e, "False")) return "";
-
- ATermList l;
- if (ATmatch(e, "[<list>]", &l)) {
- string s;
- bool first = true;
- while (!ATisEmpty(l)) {
- if (!first) s = s + " "; else first = false;
- s += processBinding(state, evalExpr(state, ATgetFirst(l)), ne);
- l = ATgetNext(l);
- }
- return s;
- }
-
- throw badTerm("invalid package binding", e);
-}
-
-
+#if 0
static Expr evalExpr2(EvalState & state, Expr e)
{
- char * s1;
- Expr e1, e2, e3, e4;
- ATermList bnds;
-
- /* Normal forms. */
- if (ATmatch(e, "<str>", &s1) ||
- ATmatch(e, "[<list>]", &e1) ||
- ATmatch(e, "True") ||
- ATmatch(e, "False") ||
- ATmatch(e, "Function([<list>], <term>)", &e1, &e2) ||
- ATmatch(e, "NixExpr(<str>)", &s1))
- return e;
-
- try {
- Hash pkgHash = hashPackage(state, parseNixExpr(e));
- Path pkgPath = writeTerm(e, "");
- state.pkgHashes[pkgPath] = pkgHash;
- return ATmake("NixExpr(<str>)", pkgPath.c_str());
- } catch (...) { /* !!! catch parse errors only */
- }
-
- /* Application. */
- if (ATmatch(e, "Call(<term>, [<list>])", &e1, &e2) ||
- ATmatch(e, "App(<term>, [<list>])", &e1, &e2)) {
- e1 = evalExpr(state, e1);
- if (!ATmatch(e1, "Function([<list>], <term>)", &e3, &e4))
- throw badTerm("expecting a function", e1);
- return evalExpr(state,
- substExprMany((ATermList) e3, (ATermList) e2, e4));
- }
-
/* Conditional. */
if (ATmatch(e, "If(<term>, <term>, <term>)", &e1, &e2, &e3)) {
e1 = evalExpr(state, e1);
@@ -226,127 +56,6 @@ static Expr evalExpr2(EvalState & state, Expr e)
ATmake("True") : ATmake("False");
}
- /* Platform constant. */
- if (ATmatch(e, "Platform")) {
- return ATmake("<str>", thisSystem.c_str());
- }
-
- /* Fix inclusion. */
- if (ATmatch(e, "IncludeFix(<str>)", &s1)) {
- Path fileName(s1);
- return evalFile(state, s1);
- }
-
- /* Relative files. */
- if (ATmatch(e, "Relative(<str>)", &s1)) {
- Path srcPath = s1;
- Path dstPath = addToStore(srcPath);
-
- ClosureElem elem;
- NixExpr ne;
- ne.type = NixExpr::neClosure;
- ne.closure.roots.insert(dstPath);
- ne.closure.elems[dstPath] = elem;
-
- Hash pkgHash = hashPackage(state, ne);
- Path pkgPath = writeTerm(unparseNixExpr(ne), "");
- state.pkgHashes[pkgPath] = pkgHash;
-
- msg(lvlChatty, format("copied `%1%' -> closure `%2%'")
- % srcPath % pkgPath);
-
- return ATmake("NixExpr(<str>)", pkgPath.c_str());
- }
-
- /* Packages are transformed into Nix derivation expressions. */
- if (ATmatch(e, "Package([<list>])", &bnds)) {
-
- /* Evaluate the bindings and put them in a map. */
- map<string, ATerm> bndMap;
- bndMap["platform"] = ATmake("<str>", thisSystem.c_str());
- while (!ATisEmpty(bnds)) {
- ATerm bnd = ATgetFirst(bnds);
- if (!ATmatch(bnd, "(<str>, <term>)", &s1, &e1))
- throw badTerm("binding expected", bnd);
- bndMap[s1] = evalExpr(state, e1);
- bnds = ATgetNext(bnds);
- }
-
- /* Gather information for building the derivation
- expression. */
- NixExpr ne;
- ne.type = NixExpr::neDerivation;
- ne.derivation.platform = thisSystem;
- string name;
- Path outPath;
- Hash outHash;
- bool outHashGiven = false;
- bnds = ATempty;
-
- for (map<string, ATerm>::iterator it = bndMap.begin();
- it != bndMap.end(); it++)
- {
- string key = it->first;
- ATerm value = it->second;
-
- if (key == "args") {
- ATermList args;
- if (!ATmatch(value, "[<list>]", &args))
- throw badTerm("list expected", value);
-
- while (!ATisEmpty(args)) {
- Expr arg = evalExpr(state, ATgetFirst(args));
- ne.derivation.args.push_back(processBinding(state, arg, ne));
- args = ATgetNext(args);
- }
- }
-
- else {
- string s = processBinding(state, value, ne);
- ne.derivation.env[key] = s;
-
- if (key == "build") ne.derivation.builder = s;
- if (key == "name") name = s;
- if (key == "outPath") outPath = s;
- if (key == "id") {
- outHash = parseHash(s);
- outHashGiven = true;
- }
- }
-
- bnds = ATinsert(bnds,
- ATmake("(<str>, <term>)", key.c_str(), value));
- }
-
- if (ne.derivation.builder == "")
- throw badTerm("no builder specified", e);
-
- if (name == "")
- throw badTerm("no package name specified", e);
-
- /* Determine the output path. */
- if (!outHashGiven) outHash = hashPackage(state, ne);
- if (outPath == "")
- /* Hash the Nix expression with no outputs to produce a
- unique but deterministic path name for this package. */
- outPath =
- canonPath(nixStore + "/" + ((string) outHash).c_str() + "-" + name);
- ne.derivation.env["out"] = outPath;
- ne.derivation.outputs.insert(outPath);
-
- /* Write the resulting term into the Nix store directory. */
- Hash pkgHash = outHashGiven
- ? hashString((string) outHash + outPath)
- : hashPackage(state, ne);
- Path pkgPath = writeTerm(unparseNixExpr(ne), "-d-" + name);
- state.pkgHashes[pkgPath] = pkgHash;
-
- msg(lvlChatty, format("instantiated `%1%' -> `%2%'")
- % name % pkgPath);
-
- return ATmake("NixExpr(<str>)", pkgPath.c_str());
- }
-
/* BaseName primitive function. */
if (ATmatch(e, "BaseName(<term>)", &e1)) {
e1 = evalExpr(state, e1);
@@ -355,8 +64,6 @@ static Expr evalExpr2(EvalState & state, Expr e)
return ATmake("<str>", baseNameOf(s1).c_str());
}
- /* Barf. */
- throw badTerm("invalid expression", e);
}
#endif
@@ -374,17 +81,27 @@ static Expr evalStdin(EvalState & state)
static void printNixExpr(EvalState & state, Expr e)
{
ATermList es;
- char * s;
- if (ATmatch(e, "NixExpr(<str>)", &s)) {
- cout << format("%1%\n") % s;
- }
- else if (ATmatch(e, "[<list>]", &es)) {
+
+ if (ATmatch(e, "Attrs([<list>])", &es)) {
+ Expr a = queryAttr(e, "type");
+ if (a && evalString(state, a) == "derivation") {
+ a = queryAttr(e, "drvPath");
+ if (a) {
+ cout << format("%1%\n") % evalPath(state, a);
+ return;
+ }
+ }
+ }
+
+ if (ATmatch(e, "[<list>]", &es)) {
while (!ATisEmpty(es)) {
printNixExpr(state, evalExpr(state, ATgetFirst(es)));
es = ATgetNext(es);
}
+ return;
}
- else throw badTerm("top level does not evaluate to a (list of) Nix expression(s)", e);
+
+ throw badTerm("top level does not evaluate to one or more Nix expressions", e);
}
@@ -435,6 +152,8 @@ void run(Strings args)
Expr e = evalFile(state, absPath(*it));
printNixExpr(state, e);
}
+
+ printEvalStats(state);
}
diff --git a/src/fix-ng/fix.sdf b/src/fix-ng/fix.sdf
index 2074d9829..cae5d2748 100644
--- a/src/fix-ng/fix.sdf
+++ b/src/fix-ng/fix.sdf
@@ -44,6 +44,9 @@ exports
"{" {Id ","}* "}" ":" Expr
-> Expr {cons("Function"), right}
+ "rec" "{" {Bind ","}* "}"
+ -> Expr {cons("Rec")}
+
"{" {Bind ","}* "}"
-> Expr {cons("Attrs")}
@@ -71,6 +74,7 @@ exports
sorts Id Path
lexical syntax
[a-zA-Z\_][a-zA-Z0-9\_\']* -> Id
+ "rec" -> Id {reject}
[0-9]+ -> Int
"\"" ~[\n\"]* "\"" -> Str
PathComp ("/" PathComp)+ -> Path
diff --git a/src/fix-ng/parser.cc b/src/fix-ng/parser.cc
index d146ad88c..d310397c2 100644
--- a/src/fix-ng/parser.cc
+++ b/src/fix-ng/parser.cc
@@ -40,7 +40,7 @@ struct Cleanup : TermFun
string path(s);
if (path[0] != '/')
path = basePath + "/" + path;
- return ATmake("Str(<str>)", canonPath(path).c_str());
+ return ATmake("Path(<str>)", canonPath(path).c_str());
}
if (ATmatch(e, "Int(<str>)", &s)) {
diff --git a/src/fix-ng/primops.cc b/src/fix-ng/primops.cc
new file mode 100644
index 000000000..f86f9eb38
--- /dev/null
+++ b/src/fix-ng/primops.cc
@@ -0,0 +1,206 @@
+#include "primops.hh"
+#include "normalise.hh"
+#include "globals.hh"
+
+
+Expr primImport(EvalState & state, Expr arg)
+{
+ char * path;
+ if (!ATmatch(arg, "Path(<str>)", &path))
+ throw badTerm("path expected", arg);
+ return evalFile(state, path);
+}
+
+
+static PathSet nixExprRootsCached(EvalState & state, const Path & nePath)
+{
+ DrvPaths::iterator i = state.drvPaths.find(nePath);
+ if (i != state.drvPaths.end())
+ return i->second;
+ else {
+ PathSet paths = nixExprRoots(nePath);
+ state.drvPaths[nePath] = paths;
+ return paths;
+ }
+}
+
+
+static Hash hashDerivation(EvalState & state, NixExpr ne)
+{
+ if (ne.type == NixExpr::neDerivation) {
+ PathSet inputs2;
+ for (PathSet::iterator i = ne.derivation.inputs.begin();
+ i != ne.derivation.inputs.end(); i++)
+ {
+ DrvHashes::iterator j = state.drvHashes.find(*i);
+ if (j == state.drvHashes.end())
+ throw Error(format("don't know expression `%1%'") % (string) *i);
+ inputs2.insert(j->second);
+ }
+ ne.derivation.inputs = inputs2;
+ }
+ return hashTerm(unparseNixExpr(ne));
+}
+
+
+static Path copyAtom(EvalState & state, const Path & srcPath)
+{
+ /* !!! should be cached */
+ Path dstPath(addToStore(srcPath));
+
+ ClosureElem elem;
+ NixExpr ne;
+ ne.type = NixExpr::neClosure;
+ ne.closure.roots.insert(dstPath);
+ ne.closure.elems[dstPath] = elem;
+
+ Hash drvHash = hashDerivation(state, ne);
+ Path drvPath = writeTerm(unparseNixExpr(ne), "");
+ state.drvHashes[drvPath] = drvHash;
+
+ msg(lvlChatty, format("copied `%1%' -> closure `%2%'")
+ % srcPath % drvPath);
+ return drvPath;
+}
+
+
+static string addInput(EvalState & state,
+ Path & nePath, NixExpr & ne)
+{
+ PathSet paths = nixExprRootsCached(state, nePath);
+ if (paths.size() != 1) abort();
+ Path path = *(paths.begin());
+ ne.derivation.inputs.insert(nePath);
+ return path;
+}
+
+
+static string processBinding(EvalState & state, Expr e, NixExpr & ne)
+{
+ e = evalExpr(state, e);
+
+ char * s;
+ ATermList es;
+
+ if (ATmatch(e, "Str(<str>)", &s)) return s;
+ if (ATmatch(e, "Uri(<str>)", &s)) return s;
+ if (ATmatch(e, "True")) return "1";
+ if (ATmatch(e, "False")) return "";
+
+ if (ATmatch(e, "Attrs([<list>])", &es)) {
+ Expr a = queryAttr(e, "type");
+ if (a && evalString(state, a) == "derivation") {
+ a = queryAttr(e, "drvPath");
+ if (a) {
+ Path drvPath = evalPath(state, a);
+ return addInput(state, drvPath, ne);
+ }
+ }
+ }
+
+ if (ATmatch(e, "Path(<str>)", &s)) {
+ Path drvPath = copyAtom(state, s);
+ return addInput(state, drvPath, ne);
+ }
+
+ if (ATmatch(e, "List([<list>])", &es)) {
+ string s;
+ bool first = true;
+ while (!ATisEmpty(es)) {
+ Nest nest(lvlVomit, format("processing list element"));
+ if (!first) s = s + " "; else first = false;
+ s += processBinding(state, evalExpr(state, ATgetFirst(es)), ne);
+ es = ATgetNext(es);
+ }
+ return s;
+ }
+
+ throw badTerm("invalid derivation binding", e);
+}
+
+
+Expr primDerivation(EvalState & state, Expr args)
+{
+ Nest nest(lvlVomit, "evaluating derivation");
+
+ Attrs attrs;
+ args = evalExpr(state, args);
+ queryAllAttrs(args, attrs);
+
+ /* Build the derivation expression by processing the attributes. */
+ NixExpr ne;
+ ne.type = NixExpr::neDerivation;
+
+ string drvName;
+ Path outPath;
+ Hash outHash;
+ bool outHashGiven = false;
+
+ for (Attrs::iterator i = attrs.begin(); i != attrs.end(); i++) {
+ string key = i->first;
+ Expr value = i->second;
+ Nest nest(lvlVomit, format("processing attribute `%1%'") % key);
+
+ /* The `args' attribute is special: it supplies the
+ command-line arguments to the builder. */
+ if (key == "args") {
+ ATermList args;
+ if (!ATmatch(value, "[<list>]", &args))
+ throw badTerm("list expected", value);
+ while (!ATisEmpty(args)) {
+ Expr arg = evalExpr(state, ATgetFirst(args));
+ ne.derivation.args.push_back(processBinding(state, arg, ne));
+ args = ATgetNext(args);
+ }
+ }
+
+ /* All other attributes are passed to the builder through the
+ environment. */
+ else {
+ string s = processBinding(state, value, ne);
+ ne.derivation.env[key] = s;
+ if (key == "builder") ne.derivation.builder = s;
+ else if (key == "system") ne.derivation.platform = s;
+ else if (key == "name") drvName = s;
+ else if (key == "outPath") outPath = s;
+ else if (key == "id") {
+ outHash = parseHash(s);
+ outHashGiven = true;
+ }
+ }
+ }
+
+ /* Do we have all required attributes? */
+ if (ne.derivation.builder == "")
+ throw badTerm("required attribute `builder' missing", args);
+ if (ne.derivation.platform == "")
+ throw badTerm("required attribute `system' missing", args);
+ if (drvName == "")
+ throw badTerm("required attribute `name' missing", args);
+
+ /* Determine the output path. */
+ if (!outHashGiven) outHash = hashDerivation(state, ne);
+ if (outPath == "")
+ /* Hash the Nix expression with no outputs to produce a
+ unique but deterministic path name for this derivation. */
+ outPath = canonPath(nixStore + "/" +
+ ((string) outHash).c_str() + "-" + drvName);
+ ne.derivation.env["out"] = outPath;
+ ne.derivation.outputs.insert(outPath);
+
+ /* Write the resulting term into the Nix store directory. */
+ Hash drvHash = outHashGiven
+ ? hashString((string) outHash + outPath)
+ : hashDerivation(state, ne);
+ Path drvPath = writeTerm(unparseNixExpr(ne), "-d-" + drvName);
+ state.drvHashes[drvPath] = drvHash;
+
+ msg(lvlChatty, format("instantiated `%1%' -> `%2%'")
+ % drvName % drvPath);
+
+ attrs["outPath"] = ATmake("Path(<str>)", outPath.c_str());
+ attrs["drvPath"] = ATmake("Path(<str>)", drvPath.c_str());
+ attrs["type"] = ATmake("Str(\"derivation\")");
+
+ return makeAttrs(attrs);
+}
diff --git a/src/fix-ng/primops.hh b/src/fix-ng/primops.hh
new file mode 100644
index 000000000..41b572c68
--- /dev/null
+++ b/src/fix-ng/primops.hh
@@ -0,0 +1,22 @@
+#ifndef __PRIMOPS_H
+#define __PRIMOPS_H
+
+#include "eval.hh"
+
+
+/* Load and evaluate an expression from path specified by the
+ argument. */
+Expr primImport(EvalState & state, Expr arg);
+
+
+/* Construct (as a unobservable) side effect) a Nix derivation
+ expression that performs the derivation described by the argument
+ set. Returns the original set extended with the following
+ attributes: `outPath' containing the primary output path of the
+ derivation; `drvPath' containing the path of the Nix expression;
+ and `type' set to `derivation' to indicate that this is a
+ derivation. */
+Expr primDerivation(EvalState & state, Expr args);
+
+
+#endif /* !__PRIMOPS_H */
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