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* "Nix expression" -> "store expression".

Browse source 
* More refactoring.
This commit is contained in:
Eelco Dolstra 2003-11-18 11:22:29 +00:00
parent 9f0f020929
commit ce92d1bf14
20 changed files with 121 additions and 119 deletions
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2
src/libstore/Makefile.am
View file

@ -1,7 +1,7 @@
noinst_LIBRARIES = libstore.a
libstore_a_SOURCES = \
store.cc expr.cc normalise.cc exec.cc \
store.cc storeexpr.cc normalise.cc exec.cc \
globals.cc db.cc references.cc pathlocks.cc
AM_CXXFLAGS = -DSYSTEM=\"@host@\" -Wall \

54
src/libstore/normalise.cc
View file

@ -18,21 +18,21 @@ static Path useSuccessor(const Path & path)
}
Path normaliseNixExpr(const Path & _nePath, PathSet pending)
Path normaliseStoreExpr(const Path & _nePath, PathSet pending)
{
startNest(nest, lvlTalkative,
format("normalising expression in `%1%'") % (string) _nePath);
format("normalising store expression in `%1%'") % (string) _nePath);
/* Try to substitute the expression by any known successors in
order to speed up the rewrite process. */
Path nePath = useSuccessor(_nePath);
/* Get the Nix expression. */
NixExpr ne = exprFromPath(nePath, pending);
/* Get the store expression. */
StoreExpr ne = storeExprFromPath(nePath, pending);
/* If this is a normal form (i.e., a closure) we are done. */
if (ne.type == NixExpr::neClosure) return nePath;
if (ne.type != NixExpr::neDerivation) abort();
if (ne.type == StoreExpr::neClosure) return nePath;
if (ne.type != StoreExpr::neDerivation) abort();
/* Otherwise, it's a derivation expression, and we have to build it to
@ -51,8 +51,8 @@ Path normaliseNixExpr(const Path & _nePath, PathSet pending)
Environment env;
/* The result. */
NixExpr nf;
nf.type = NixExpr::neClosure;
StoreExpr nf;
nf.type = StoreExpr::neClosure;
/* The outputs are referenceable paths. */
@ -78,10 +78,10 @@ Path normaliseNixExpr(const Path & _nePath, PathSet pending)
{
Path nePath2 = useSuccessor(nePath);
if (nePath != nePath2) {
NixExpr ne = exprFromPath(nePath2, pending);
StoreExpr ne = storeExprFromPath(nePath2, pending);
debug(format("skipping build of expression `%1%', someone beat us to it")
% (string) nePath);
if (ne.type != NixExpr::neClosure) abort();
if (ne.type != StoreExpr::neClosure) abort();
return nePath2;
}
}
@ -95,12 +95,12 @@ Path normaliseNixExpr(const Path & _nePath, PathSet pending)
for (PathSet::iterator i = ne.derivation.inputs.begin();
i != ne.derivation.inputs.end(); i++)
{
Path nfPath = normaliseNixExpr(*i, pending);
Path nfPath = normaliseStoreExpr(*i, pending);
realiseClosure(nfPath, pending);
/* !!! nfPath should be a root of the garbage collector while
we are building */
NixExpr ne = exprFromPath(nfPath, pending);
if (ne.type != NixExpr::neClosure) abort();
StoreExpr ne = storeExprFromPath(nfPath, pending);
if (ne.type != StoreExpr::neClosure) abort();
for (ClosureElems::iterator j = ne.closure.elems.begin();
j != ne.closure.elems.end(); j++)
{
@ -238,7 +238,7 @@ Path normaliseNixExpr(const Path & _nePath, PathSet pending)
/* Write the normal form. This does not have to occur in the
transaction below because writing terms is idem-potent. */
ATerm nfTerm = unparseNixExpr(nf);
ATerm nfTerm = unparseStoreExpr(nf);
printMsg(lvlVomit, format("normal form: %1%") % atPrint(nfTerm));
Path nfPath = writeTerm(nfTerm, "-s");
@ -264,8 +264,8 @@ void realiseClosure(const Path & nePath, PathSet pending)
{
startNest(nest, lvlDebug, format("realising closure `%1%'") % nePath);
NixExpr ne = exprFromPath(nePath, pending);
if (ne.type != NixExpr::neClosure)
StoreExpr ne = storeExprFromPath(nePath, pending);
if (ne.type != StoreExpr::neClosure)
throw Error(format("expected closure in `%1%'") % nePath);
for (ClosureElems::const_iterator i = ne.closure.elems.begin();
@ -286,7 +286,7 @@ void ensurePath(const Path & path, PathSet pending)
i != subPaths.end(); i++)
{
try {
normaliseNixExpr(*i, pending);
normaliseStoreExpr(*i, pending);
if (isValidPath(path)) return;
throw Error(format("substitute failed to produce expected output path"));
} catch (Error & e) {
@ -301,24 +301,24 @@ void ensurePath(const Path & path, PathSet pending)
}
NixExpr exprFromPath(const Path & path, PathSet pending)
StoreExpr storeExprFromPath(const Path & path, PathSet pending)
{
ensurePath(path, pending);
ATerm t = ATreadFromNamedFile(path.c_str());
if (!t) throw Error(format("cannot read aterm from `%1%'") % path);
return parseNixExpr(t);
return parseStoreExpr(t);
}
PathSet nixExprRoots(const Path & nePath)
PathSet storeExprRoots(const Path & nePath)
{
PathSet paths;
NixExpr ne = exprFromPath(nePath);
StoreExpr ne = storeExprFromPath(nePath);
if (ne.type == NixExpr::neClosure)
if (ne.type == StoreExpr::neClosure)
paths.insert(ne.closure.roots.begin(), ne.closure.roots.end());
else if (ne.type == NixExpr::neDerivation)
else if (ne.type == StoreExpr::neDerivation)
paths.insert(ne.derivation.outputs.begin(),
ne.derivation.outputs.end());
else abort();
@ -334,14 +334,14 @@ static void requisitesWorker(const Path & nePath,
if (doneSet.find(nePath) != doneSet.end()) return;
doneSet.insert(nePath);
NixExpr ne = exprFromPath(nePath);
StoreExpr ne = storeExprFromPath(nePath);
if (ne.type == NixExpr::neClosure)
if (ne.type == StoreExpr::neClosure)
for (ClosureElems::iterator i = ne.closure.elems.begin();
i != ne.closure.elems.end(); i++)
paths.insert(i->first);
else if (ne.type == NixExpr::neDerivation)
else if (ne.type == StoreExpr::neDerivation)
for (PathSet::iterator i = ne.derivation.inputs.begin();
i != ne.derivation.inputs.end(); i++)
requisitesWorker(*i,
@ -358,7 +358,7 @@ static void requisitesWorker(const Path & nePath,
}
PathSet nixExprRequisites(const Path & nePath,
PathSet storeExprRequisites(const Path & nePath,
bool includeExprs, bool includeSuccessors)
{
PathSet paths;

32
src/libstore/normalise.hh
View file

@ -1,16 +1,16 @@
#ifndef __NORMALISE_H
#define __NORMALISE_H
#include "expr.hh"
#include "storeexpr.hh"
/* Normalise a Nix expression. That is, if the expression is a
/* Normalise a store expression. That is, if the expression is a
derivation, a path containing an equivalent closure expression is
returned. This requires that the derivation is performed, unless a
successor is known. */
Path normaliseNixExpr(const Path & nePath, PathSet pending = PathSet());
Path normaliseStoreExpr(const Path & nePath, PathSet pending = PathSet());
/* Realise a closure expression in the file system.
/* Realise a closure store expression in the file system.
The pending paths are those that are already being realised. This
prevents infinite recursion for paths realised through a substitute
@ -22,23 +22,25 @@ void realiseClosure(const Path & nePath, PathSet pending = PathSet());
realising a substitute. */
void ensurePath(const Path & path, PathSet pending = PathSet());
/* Read a Nix expression, after ensuring its existence through
/* Read a store expression, after ensuring its existence through
ensurePath(). */
NixExpr exprFromPath(const Path & path, PathSet pending = PathSet());
StoreExpr storeExprFromPath(const Path & path, PathSet pending = PathSet());
/* Get the list of root (output) paths of the given Nix expression. */
PathSet nixExprRoots(const Path & nePath);
/* Get the list of root (output) paths of the given store
expression. */
PathSet storeExprRoots(const Path & nePath);
/* Get the list of paths that are required to realise the given
/* Get the list of paths that are required to realise the given store
expression. For a derive expression, this is the union of
requisites of the inputs; for a closure expression, it is the path of
each element in the closure. If `includeExprs' is true, include the
paths of the Nix expressions themselves. If `includeSuccessors' is
true, include the requisites of successors. */
PathSet nixExprRequisites(const Path & nePath,
requisites of the inputs; for a closure expression, it is the path
of each element in the closure. If `includeExprs' is true, include
the paths of the store expressions themselves. If
`includeSuccessors' is true, include the requisites of
successors. */
PathSet storeExprRequisites(const Path & nePath,
bool includeExprs, bool includeSuccessors);
/* Return the list of the paths of all known Nix expressions whose
/* Return the list of the paths of all known store expressions whose
output paths are completely contained in the set `outputs'. */
PathSet findGenerators(const PathSet & outputs);

31
src/libstore/expr.cc → src/libstore/storeexpr.cc
View file

@ -1,21 +1,8 @@
#include "expr.hh"
#include "storeexpr.hh"
#include "globals.hh"
#include "store.hh"
Error badTerm(const format & f, ATerm t)
{
char * s = ATwriteToString(t);
if (!s) throw Error("cannot print term");
if (strlen(s) > 1000) {
int len;
s = ATwriteToSharedString(t, &len);
if (!s) throw Error("cannot print term");
}
return Error(format("%1%, in `%2%'") % f.str() % (string) s);
}
Hash hashTerm(ATerm t)
{
return hashString(atPrint(t));
@ -138,14 +125,14 @@ static bool parseDerivation(ATerm t, Derivation & derivation)
}
NixExpr parseNixExpr(ATerm t)
StoreExpr parseStoreExpr(ATerm t)
{
NixExpr ne;
StoreExpr ne;
if (parseClosure(t, ne.closure))
ne.type = NixExpr::neClosure;
ne.type = StoreExpr::neClosure;
else if (parseDerivation(t, ne.derivation))
ne.type = NixExpr::neDerivation;
else throw badTerm("not a Nix expression", t);
ne.type = StoreExpr::neDerivation;
else throw badTerm("not a store expression", t);
return ne;
}
@ -200,11 +187,11 @@ static ATerm unparseDerivation(const Derivation & derivation)
}
ATerm unparseNixExpr(const NixExpr & ne)
ATerm unparseStoreExpr(const StoreExpr & ne)
{
if (ne.type == NixExpr::neClosure)
if (ne.type == StoreExpr::neClosure)
return unparseClosure(ne.closure);
else if (ne.type == NixExpr::neDerivation)
else if (ne.type == StoreExpr::neDerivation)
return unparseDerivation(ne.derivation);
else abort();
}

24
src/libstore/expr.hh → src/libstore/storeexpr.hh
View file

@ -1,11 +1,11 @@
#ifndef __FSTATE_H
#define __FSTATE_H
#ifndef __STOREEXPR_H
#define __STOREEXPR_H
#include "aterm.hh"
#include "store.hh"
/* Abstract syntax of Nix expressions. */
/* Abstract syntax of store expressions. */
struct ClosureElem
{
@ -25,14 +25,14 @@ typedef map<string, string> StringPairs;
struct Derivation
{
PathSet outputs;
PathSet inputs; /* Nix expressions, not actual inputs */
PathSet inputs; /* Store expressions, not actual inputs */
string platform;
Path builder;
Strings args;
StringPairs env;
};
struct NixExpr
struct StoreExpr
{
enum { neClosure, neDerivation } type;
Closure closure;
@ -40,21 +40,17 @@ struct NixExpr
};
/* Throw an exception with an error message containing the given
aterm. */
Error badTerm(const format & f, ATerm t);
/* Hash an aterm. */
Hash hashTerm(ATerm t);
/* Write an aterm to the Nix store directory, and return its path. */
Path writeTerm(ATerm t, const string & suffix);
/* Parse a Nix expression. */
NixExpr parseNixExpr(ATerm t);
/* Parse a store expression. */
StoreExpr parseStoreExpr(ATerm t);
/* Parse a Nix expression. */
ATerm unparseNixExpr(const NixExpr & ne);
/* Parse a store expression. */
ATerm unparseStoreExpr(const StoreExpr & ne);
#endif /* !__FSTATE_H */
#endif /* !__STOREEXPR_H */