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* Make `derivation' lazy again for performance. It also turns out

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that there are some places in Nixpkgs (php_configurable /
  composableDerivation, it seems) that call `derivation' with
  incorrect arguments (namely, the `name' attribute missing) but get
  away with it because of laziness.
This commit is contained in:
Eelco Dolstra 2010-04-01 09:55:57 +00:00
parent dc31305b38
commit 71f026292b
3 changed files with 17 additions and 37 deletions
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10
src/libexpr/eval.cc
View file

@ -159,14 +159,6 @@ LocalNoInline(void addErrorPrefix(Error & e, const char * s, const string & s2,
} }
static void mkThunk(Value & v, Env & env, Expr expr)
{
v.type = tThunk;
v.thunk.env = &env;
v.thunk.expr = expr;
}
void mkString(Value & v, const char * s) void mkString(Value & v, const char * s)
{ {
v.type = tString; v.type = tString;
@ -179,7 +171,7 @@ void mkString(Value & v, const string & s, const PathSet & context)
{ {
mkString(v, s.c_str()); mkString(v, s.c_str());
if (!context.empty()) { if (!context.empty()) {
unsigned int len = 0, n = 0; unsigned int n = 0;
v.string.context = new const char *[context.size() + 1]; v.string.context = new const char *[context.size() + 1];
foreach (PathSet::const_iterator, i, context) foreach (PathSet::const_iterator, i, context)
v.string.context[n++] = strdup(i->c_str()); v.string.context[n++] = strdup(i->c_str());

8
src/libexpr/eval.hh
View file

@ -104,6 +104,14 @@ static inline void mkBool(Value & v, bool b)
} }
static inline void mkThunk(Value & v, Env & env, Expr expr)
{
v.type = tThunk;
v.thunk.env = &env;
v.thunk.expr = expr;
}
void mkString(Value & v, const char * s); void mkString(Value & v, const char * s);
void mkString(Value & v, const string & s, const PathSet & context = PathSet()); void mkString(Value & v, const string & s, const PathSet & context = PathSet());
void mkPath(Value & v, const char * s); void mkPath(Value & v, const char * s);

36
src/libexpr/primops.cc
View file

@ -448,34 +448,9 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v)
state.drvHashes[drvPath] = hashDerivationModulo(state, drv); state.drvHashes[drvPath] = hashDerivationModulo(state, drv);
/* !!! assumes a single output */ /* !!! assumes a single output */
//state.mkAttrs(v); state.mkAttrs(v);
state.cloneAttrs(*args[0], v);
mkString((*v.attrs)[toATerm("outPath")], outPath, singleton<PathSet>(drvPath)); mkString((*v.attrs)[toATerm("outPath")], outPath, singleton<PathSet>(drvPath));
mkString((*v.attrs)[toATerm("drvPath")], drvPath, singleton<PathSet>("=" + drvPath)); mkString((*v.attrs)[toATerm("drvPath")], drvPath, singleton<PathSet>("=" + drvPath));
mkString((*v.attrs)[toATerm("type")], "derivation"); // !!! remove
}
static void prim_derivationLazy(EvalState & state, Value * * args, Value & v)
{
state.forceAttrs(*args[0]);
state.cloneAttrs(*args[0], v);
mkString((*v.attrs)[toATerm("type")], "derivation");
/* !!! */
#if 0
Expr drvStrict = makeCall(makeVar(toATerm("derivation!")), eAttrs);
attrs.set(toATerm("outPath"),
makeAttrRHS(makeSelect(drvStrict, toATerm("outPath")), makeNoPos()));
attrs.set(toATerm("drvPath"),
makeAttrRHS(makeSelect(drvStrict, toATerm("drvPath")), makeNoPos()));
return makeAttrs(attrs);
#endif
} }
@ -1039,6 +1014,12 @@ void EvalState::createBaseEnv()
mkString(v, thisSystem.c_str()); mkString(v, thisSystem.c_str());
addConstant("__currentSystem", v); addConstant("__currentSystem", v);
/* Add a wrapper around the derivation primop that computes the
`drvPath' and `outPath' attributes lazily. */
string s = "attrs: let res = derivationStrict attrs; in attrs // { drvPath = res.drvPath; outPath = res.outPath; type = \"derivation\"; }";
mkThunk(v, baseEnv, parseExprFromString(*this, s, "/"));
addConstant("derivation", v);
// Miscellaneous // Miscellaneous
addPrimOp("import", 1, prim_import); addPrimOp("import", 1, prim_import);
addPrimOp("isNull", 1, prim_isNull); addPrimOp("isNull", 1, prim_isNull);
@ -1059,8 +1040,7 @@ void EvalState::createBaseEnv()
addPrimOp("__trace", 2, prim_trace); addPrimOp("__trace", 2, prim_trace);
// Derivations // Derivations
addPrimOp("derivation", 1, prim_derivationStrict); addPrimOp("derivationStrict", 1, prim_derivationStrict);
//addPrimOp("derivation", 1, prim_derivationLazy);
// Paths // Paths
addPrimOp("__toPath", 1, prim_toPath); addPrimOp("__toPath", 1, prim_toPath);