* Remove a lot of dead code.
This commit is contained in:
Eelco Dolstra
parent
7e048eddf5
commit
b7b3dd55f9
4 changed files with 10 additions and 763 deletions
|
|
@ -27,7 +27,14 @@ std::ostream & operator << (std::ostream & str, Value & v)
|
||||||
str << (v.boolean ? "true" : "false");
|
str << (v.boolean ? "true" : "false");
|
||||||
break;
|
break;
|
||||||
case tString:
|
case tString:
|
||||||
str << "\"" << v.string.s << "\""; // !!! escaping
|
str << "\"";
|
||||||
|
for (const char * i = v.string.s; *i; i++)
|
||||||
|
if (*i == '\"' || *i == '\\') str << "\\" << *i;
|
||||||
|
else if (*i == '\n') str << "\\n";
|
||||||
|
else if (*i == '\r') str << "\\r";
|
||||||
|
else if (*i == '\t') str << "\\t";
|
||||||
|
else str << *i;
|
||||||
|
str << "\"";
|
||||||
break;
|
break;
|
||||||
case tPath:
|
case tPath:
|
||||||
str << v.path; // !!! escaping?
|
str << v.path; // !!! escaping?
|
||||||
|
|
@ -930,497 +937,6 @@ bool EvalState::eqValues(Value & v1, Value & v2)
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
||||||
#if 0
|
|
||||||
/* Pattern-match `pat' against `arg'. The result is a set of
|
|
||||||
substitutions (`subs') and a set of recursive substitutions
|
|
||||||
(`subsRecursive'). The latter can refer to the variables bound by
|
|
||||||
both `subs' and `subsRecursive'. */
|
|
||||||
static void patternMatch(EvalState & state,
|
|
||||||
Pattern pat, Expr arg, ATermMap & subs, ATermMap & subsRecursive)
|
|
||||||
{
|
|
||||||
ATerm name;
|
|
||||||
ATermList formals;
|
|
||||||
ATermBool ellipsis;
|
|
||||||
|
|
||||||
if (matchVarPat(pat, name))
|
|
||||||
subs.set(name, arg);
|
|
||||||
|
|
||||||
else if (matchAttrsPat(pat, formals, ellipsis, name)) {
|
|
||||||
|
|
||||||
arg = evalExpr(state, arg);
|
|
||||||
|
|
||||||
if (name != sNoAlias) subs.set(name, arg);
|
|
||||||
|
|
||||||
/* Get the actual arguments. */
|
|
||||||
ATermMap attrs;
|
|
||||||
queryAllAttrs(arg, attrs);
|
|
||||||
unsigned int nrAttrs = attrs.size();
|
|
||||||
|
|
||||||
/* For each formal argument, get the actual argument. If
|
|
||||||
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 name, def;
|
|
||||||
DefaultValue def2;
|
|
||||||
if (!matchFormal(*i, name, def2)) abort(); /* can't happen */
|
|
||||||
|
|
||||||
Expr value = attrs[name];
|
|
||||||
|
|
||||||
if (value == 0) {
|
|
||||||
if (!matchDefaultValue(def2, def)) def = 0;
|
|
||||||
if (def == 0) throw TypeError(format("the argument named `%1%' required by the function is missing")
|
|
||||||
% aterm2String(name));
|
|
||||||
subsRecursive.set(name, def);
|
|
||||||
} else {
|
|
||||||
attrsUsed++;
|
|
||||||
attrs.remove(name);
|
|
||||||
subs.set(name, value);
|
|
||||||
}
|
|
||||||
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Check that each actual argument is listed as a formal
|
|
||||||
argument (unless the attribute match specifies a `...'). */
|
|
||||||
if (ellipsis == eFalse && attrsUsed != nrAttrs)
|
|
||||||
throw TypeError(format("the function does not expect an argument named `%1%'")
|
|
||||||
% aterm2String(attrs.begin()->key));
|
|
||||||
}
|
|
||||||
|
|
||||||
else abort();
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
/* Substitute an argument set into the body of a function. */
|
|
||||||
static Expr substArgs(EvalState & state,
|
|
||||||
Expr body, Pattern pat, Expr arg)
|
|
||||||
{
|
|
||||||
ATermMap subs(16), subsRecursive(16);
|
|
||||||
|
|
||||||
patternMatch(state, pat, arg, subs, subsRecursive);
|
|
||||||
|
|
||||||
/* If we used any default values, make a recursive attribute set
|
|
||||||
out of the (argument-name, value) tuples. This is so that we
|
|
||||||
can support default values that refer to each other, e.g. ({x,
|
|
||||||
y ? x + x}: y) {x = "foo";} evaluates to "foofoo". */
|
|
||||||
if (subsRecursive.size() != 0) {
|
|
||||||
ATermList recAttrs = ATempty;
|
|
||||||
foreach (ATermMap::const_iterator, i, subs)
|
|
||||||
recAttrs = ATinsert(recAttrs, makeBind(i->key, i->value, makeNoPos()));
|
|
||||||
foreach (ATermMap::const_iterator, i, subsRecursive)
|
|
||||||
recAttrs = ATinsert(recAttrs, makeBind(i->key, i->value, makeNoPos()));
|
|
||||||
Expr rec = makeRec(recAttrs, ATempty);
|
|
||||||
foreach (ATermMap::const_iterator, i, subsRecursive)
|
|
||||||
subs.set(i->key, makeSelect(rec, i->key));
|
|
||||||
}
|
|
||||||
|
|
||||||
return substitute(Substitution(0, &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;}'. */
|
|
||||||
LocalNoInline(ATerm expandRec(EvalState & state, ATerm e, ATermList rbnds, ATermList nrbnds))
|
|
||||||
{
|
|
||||||
ATerm name;
|
|
||||||
Expr e2;
|
|
||||||
Pos pos;
|
|
||||||
Expr eOverrides = 0;
|
|
||||||
|
|
||||||
/* Create the substitution list. */
|
|
||||||
ATermMap subs(ATgetLength(rbnds) + ATgetLength(nrbnds));
|
|
||||||
for (ATermIterator i(rbnds); i; ++i) {
|
|
||||||
if (!matchBind(*i, name, e2, pos)) abort(); /* can't happen */
|
|
||||||
subs.set(name, makeSelect(e, name));
|
|
||||||
}
|
|
||||||
for (ATermIterator i(nrbnds); i; ++i) {
|
|
||||||
if (!matchBind(*i, name, e2, pos)) abort(); /* can't happen */
|
|
||||||
if (name == sOverrides) eOverrides = e2;
|
|
||||||
subs.set(name, e2);
|
|
||||||
}
|
|
||||||
|
|
||||||
/* If the rec contains an attribute called `__overrides', then
|
|
||||||
evaluate it, and add the attributes in that set to the rec.
|
|
||||||
This allows overriding of recursive attributes, which is
|
|
||||||
otherwise not possible. (You can use the // operator to
|
|
||||||
replace an attribute, but other attributes in the rec will
|
|
||||||
still reference the original value, because that value has been
|
|
||||||
substituted into the bodies of the other attributes. Hence we
|
|
||||||
need __overrides.) */
|
|
||||||
ATermMap overrides;
|
|
||||||
if (eOverrides) {
|
|
||||||
eOverrides = evalExpr(state, eOverrides);
|
|
||||||
queryAllAttrs(eOverrides, overrides, false);
|
|
||||||
foreach (ATermMap::const_iterator, i, overrides)
|
|
||||||
subs.set(i->key, i->value);
|
|
||||||
}
|
|
||||||
|
|
||||||
Substitution subs_(0, &subs);
|
|
||||||
|
|
||||||
/* Create the non-recursive set. */
|
|
||||||
ATermMap as(ATgetLength(rbnds) + ATgetLength(nrbnds));
|
|
||||||
for (ATermIterator i(rbnds); i; ++i) {
|
|
||||||
if (!matchBind(*i, name, e2, pos)) abort(); /* can't happen */
|
|
||||||
as.set(name, makeAttrRHS(substitute(subs_, e2), pos));
|
|
||||||
}
|
|
||||||
|
|
||||||
if (eOverrides)
|
|
||||||
foreach (ATermMap::const_iterator, i, overrides)
|
|
||||||
as.set(i->key, makeAttrRHS(i->value, makeNoPos()));
|
|
||||||
|
|
||||||
/* Copy the non-recursive bindings. !!! inefficient */
|
|
||||||
for (ATermIterator i(nrbnds); i; ++i) {
|
|
||||||
if (!matchBind(*i, name, e2, pos)) abort(); /* can't happen */
|
|
||||||
as.set(name, makeAttrRHS(e2, pos));
|
|
||||||
}
|
|
||||||
|
|
||||||
return makeAttrs(as);
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
static void flattenList(EvalState & state, Expr e, ATermList & result)
|
|
||||||
{
|
|
||||||
ATermList es;
|
|
||||||
e = evalExpr(state, e);
|
|
||||||
if (matchList(e, es))
|
|
||||||
for (ATermIterator i(es); i; ++i)
|
|
||||||
flattenList(state, *i, result);
|
|
||||||
else
|
|
||||||
result = ATinsert(result, e);
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
ATermList flattenList(EvalState & state, Expr e)
|
|
||||||
{
|
|
||||||
ATermList result = ATempty;
|
|
||||||
flattenList(state, e, result);
|
|
||||||
return ATreverse(result);
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
/* Evaluation of various language constructs. These have been taken
|
|
||||||
out of evalExpr2 to reduce stack space usage. (GCC is really dumb
|
|
||||||
about stack space: it just adds up all the local variables and
|
|
||||||
temporaries of every scope into one huge stack frame. This is
|
|
||||||
really bad for deeply recursive functions.) */
|
|
||||||
|
|
||||||
|
|
||||||
LocalNoInline(Expr evalVar(EvalState & state, ATerm name))
|
|
||||||
{
|
|
||||||
ATerm primOp = state.primOps.get(name);
|
|
||||||
if (!primOp)
|
|
||||||
throw EvalError(format("impossible: undefined variable `%1%'") % aterm2String(name));
|
|
||||||
int arity;
|
|
||||||
ATermBlob fun;
|
|
||||||
if (!matchPrimOpDef(primOp, arity, fun)) abort();
|
|
||||||
if (arity == 0)
|
|
||||||
/* !!! backtrace for primop call */
|
|
||||||
return ((PrimOp) ATgetBlobData(fun)) (state, ATermVector());
|
|
||||||
else
|
|
||||||
return makePrimOp(arity, fun, ATempty);
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
LocalNoInline(Expr evalCall(EvalState & state, Expr fun, Expr arg))
|
|
||||||
{
|
|
||||||
Pattern pat;
|
|
||||||
ATerm pos;
|
|
||||||
Expr body;
|
|
||||||
|
|
||||||
/* Evaluate the left-hand side. */
|
|
||||||
fun = evalExpr(state, fun);
|
|
||||||
|
|
||||||
/* Is it a primop or a function? */
|
|
||||||
int arity;
|
|
||||||
ATermBlob funBlob;
|
|
||||||
ATermList args;
|
|
||||||
if (matchPrimOp(fun, arity, funBlob, args)) {
|
|
||||||
args = ATinsert(args, arg);
|
|
||||||
if (ATgetLength(args) == arity) {
|
|
||||||
/* Put the arguments in a vector in reverse (i.e.,
|
|
||||||
actual) order. */
|
|
||||||
ATermVector args2(arity);
|
|
||||||
for (ATermIterator i(args); i; ++i)
|
|
||||||
args2[--arity] = *i;
|
|
||||||
/* !!! backtrace for primop call */
|
|
||||||
return ((PrimOp) ATgetBlobData(funBlob))
|
|
||||||
(state, args2);
|
|
||||||
} else
|
|
||||||
/* Need more arguments, so propagate the primop. */
|
|
||||||
return makePrimOp(arity, funBlob, args);
|
|
||||||
}
|
|
||||||
|
|
||||||
else if (matchFunction(fun, pat, body, pos)) {
|
|
||||||
try {
|
|
||||||
return evalExpr(state, substArgs(state, body, pat, arg));
|
|
||||||
} catch (Error & e) {
|
|
||||||
addErrorPrefix(e, "while evaluating the function at %1%:\n",
|
|
||||||
showPos(pos));
|
|
||||||
throw;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
else throwTypeError(
|
|
||||||
"attempt to call something which is neither a function nor a primop (built-in operation) but %1%",
|
|
||||||
showType(fun));
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
LocalNoInline(Expr evalWith(EvalState & state, Expr defs, Expr body, ATerm pos))
|
|
||||||
{
|
|
||||||
ATermMap attrs;
|
|
||||||
try {
|
|
||||||
defs = evalExpr(state, defs);
|
|
||||||
queryAllAttrs(defs, attrs);
|
|
||||||
} catch (Error & e) {
|
|
||||||
addErrorPrefix(e, "while evaluating the `with' definitions at %1%:\n",
|
|
||||||
showPos(pos));
|
|
||||||
throw;
|
|
||||||
}
|
|
||||||
try {
|
|
||||||
body = substitute(Substitution(0, &attrs), body);
|
|
||||||
checkVarDefs(state.primOps, body);
|
|
||||||
return evalExpr(state, body);
|
|
||||||
} catch (Error & e) {
|
|
||||||
addErrorPrefix(e, "while evaluating the `with' body at %1%:\n",
|
|
||||||
showPos(pos));
|
|
||||||
throw;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
/* Implementation of the `==' and `!=' operators. */
|
|
||||||
LocalNoInline(bool areEqual(EvalState & state, Expr e1, Expr e2))
|
|
||||||
{
|
|
||||||
e1 = evalExpr(state, e1);
|
|
||||||
e2 = evalExpr(state, e2);
|
|
||||||
|
|
||||||
/* We cannot test functions/primops for equality, and we currently
|
|
||||||
don't support testing equality between attribute sets or lists
|
|
||||||
- that would have to be a deep equality test to be sound. */
|
|
||||||
AFun sym1 = ATgetAFun(e1);
|
|
||||||
AFun sym2 = ATgetAFun(e2);
|
|
||||||
|
|
||||||
if (sym1 != sym2) return false;
|
|
||||||
|
|
||||||
/* Functions are incomparable. */
|
|
||||||
if (sym1 == symFunction || sym1 == symPrimOp) return false;
|
|
||||||
|
|
||||||
if (!state.allowUnsafeEquality && sym1 == symAttrs)
|
|
||||||
throw EvalError("comparison of attribute sets is not implemented");
|
|
||||||
|
|
||||||
/* !!! This allows comparisons of infinite data structures to
|
|
||||||
succeed, such as `let x = [x]; in x == x'. This is
|
|
||||||
undesirable, since equivalent (?) terms such as `let x = [x]; y
|
|
||||||
= [y]; in x == y' don't terminate. */
|
|
||||||
if (e1 == e2) return true;
|
|
||||||
|
|
||||||
if (sym1 == symList) {
|
|
||||||
ATermList es1; matchList(e1, es1);
|
|
||||||
ATermList es2; matchList(e2, es2);
|
|
||||||
if (ATgetLength(es1) != ATgetLength(es2)) return false;
|
|
||||||
ATermIterator i(es1), j(es2);
|
|
||||||
while (*i) {
|
|
||||||
if (!areEqual(state, *i, *j)) return false;
|
|
||||||
++i; ++j;
|
|
||||||
}
|
|
||||||
return true;
|
|
||||||
}
|
|
||||||
|
|
||||||
return false;
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
Expr evalExpr2(EvalState & state, Expr e)
|
|
||||||
{
|
|
||||||
/* When changing this function, make sure that you don't cause a
|
|
||||||
(large) increase in stack consumption! */
|
|
||||||
|
|
||||||
char x;
|
|
||||||
if (&x < deepestStack) deepestStack = &x;
|
|
||||||
|
|
||||||
Expr e1, e2, e3;
|
|
||||||
ATerm name, pos;
|
|
||||||
AFun sym = ATgetAFun(e);
|
|
||||||
|
|
||||||
/* Normal forms. */
|
|
||||||
if (sym == symStr ||
|
|
||||||
sym == symPath ||
|
|
||||||
sym == symNull ||
|
|
||||||
sym == symInt ||
|
|
||||||
sym == symBool ||
|
|
||||||
sym == symFunction ||
|
|
||||||
sym == symAttrs ||
|
|
||||||
sym == symList ||
|
|
||||||
sym == symPrimOp)
|
|
||||||
return e;
|
|
||||||
|
|
||||||
/* The `Closed' constructor is just a way to prevent substitutions
|
|
||||||
into expressions not containing free variables. */
|
|
||||||
if (matchClosed(e, e1))
|
|
||||||
return evalExpr(state, e1);
|
|
||||||
|
|
||||||
/* Any encountered variables must be primops (since undefined
|
|
||||||
variables are detected after parsing). */
|
|
||||||
if (matchVar(e, name)) return evalVar(state, name);
|
|
||||||
|
|
||||||
/* Function application. */
|
|
||||||
if (matchCall(e, e1, e2)) return evalCall(state, e1, e2);
|
|
||||||
|
|
||||||
/* Attribute selection. */
|
|
||||||
if (matchSelect(e, e1, name)) return evalSelect(state, e1, name);
|
|
||||||
|
|
||||||
/* Mutually recursive sets. */
|
|
||||||
ATermList rbnds, nrbnds;
|
|
||||||
if (matchRec(e, rbnds, nrbnds))
|
|
||||||
return expandRec(state, e, rbnds, nrbnds);
|
|
||||||
|
|
||||||
/* Conditionals. */
|
|
||||||
if (matchIf(e, e1, e2, e3))
|
|
||||||
return evalExpr(state, evalBool(state, e1) ? e2 : e3);
|
|
||||||
|
|
||||||
/* Assertions. */
|
|
||||||
if (matchAssert(e, e1, e2, pos)) return evalAssert(state, e1, e2, pos);
|
|
||||||
|
|
||||||
/* Withs. */
|
|
||||||
if (matchWith(e, e1, e2, pos)) return evalWith(state, e1, e2, pos);
|
|
||||||
|
|
||||||
/* Generic equality/inequality. Note that the behaviour on
|
|
||||||
composite data (lists, attribute sets) and functions is
|
|
||||||
undefined, since the subterms of those terms are not evaluated.
|
|
||||||
However, we don't want to make (==) strict, because that would
|
|
||||||
make operations like `big_derivation == null' very slow (unless
|
|
||||||
we were to evaluate them side-by-side). */
|
|
||||||
if (matchOpEq(e, e1, e2)) return makeBool(areEqual(state, e1, e2));
|
|
||||||
|
|
||||||
if (matchOpNEq(e, e1, e2)) return makeBool(!areEqual(state, e1, e2));
|
|
||||||
|
|
||||||
/* Negation. */
|
|
||||||
if (matchOpNot(e, e1))
|
|
||||||
return makeBool(!evalBool(state, e1));
|
|
||||||
|
|
||||||
/* Implication. */
|
|
||||||
if (matchOpImpl(e, e1, e2))
|
|
||||||
return makeBool(!evalBool(state, e1) || evalBool(state, e2));
|
|
||||||
|
|
||||||
/* Conjunction (logical AND). */
|
|
||||||
if (matchOpAnd(e, e1, e2))
|
|
||||||
return makeBool(evalBool(state, e1) && evalBool(state, e2));
|
|
||||||
|
|
||||||
/* Disjunction (logical OR). */
|
|
||||||
if (matchOpOr(e, e1, e2))
|
|
||||||
return makeBool(evalBool(state, e1) || evalBool(state, e2));
|
|
||||||
|
|
||||||
/* Attribute set update (//). */
|
|
||||||
if (matchOpUpdate(e, e1, e2))
|
|
||||||
return updateAttrs(evalExpr(state, e1), evalExpr(state, e2));
|
|
||||||
|
|
||||||
/* Attribute existence test (?). */
|
|
||||||
if (matchOpHasAttr(e, e1, name)) return evalHasAttr(state, e1, name);
|
|
||||||
|
|
||||||
/* String or path concatenation. */
|
|
||||||
if (sym == symOpPlus || sym == symConcatStrings)
|
|
||||||
return evalPlusConcat(state, e);
|
|
||||||
|
|
||||||
/* Backwards compatability: subpath operator (~). */
|
|
||||||
if (matchSubPath(e, e1, e2)) return evalSubPath(state, e1, e2);
|
|
||||||
|
|
||||||
/* List concatenation. */
|
|
||||||
if (matchOpConcat(e, e1, e2)) return evalOpConcat(state, e1, e2);
|
|
||||||
|
|
||||||
/* Barf. */
|
|
||||||
abort();
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
Expr evalExpr(EvalState & state, Expr e)
|
|
||||||
{
|
|
||||||
checkInterrupt();
|
|
||||||
|
|
||||||
#if 0
|
|
||||||
startNest(nest, lvlVomit,
|
|
||||||
format("evaluating expression: %1%") % e);
|
|
||||||
#endif
|
|
||||||
|
|
||||||
state.nrEvaluated++;
|
|
||||||
|
|
||||||
/* Consult the memo table to quickly get the normal form of
|
|
||||||
previously evaluated expressions. */
|
|
||||||
Expr nf = state.normalForms.get(e);
|
|
||||||
if (nf) {
|
|
||||||
if (nf == makeBlackHole())
|
|
||||||
throwEvalError("infinite recursion encountered");
|
|
||||||
state.nrCached++;
|
|
||||||
return nf;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Otherwise, evaluate and memoize. */
|
|
||||||
state.normalForms.set(e, makeBlackHole());
|
|
||||||
try {
|
|
||||||
nf = evalExpr2(state, e);
|
|
||||||
} catch (Error & err) {
|
|
||||||
state.normalForms.remove(e);
|
|
||||||
throw;
|
|
||||||
}
|
|
||||||
state.normalForms.set(e, nf);
|
|
||||||
return nf;
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
static Expr strictEvalExpr(EvalState & state, Expr e, ATermMap & nfs);
|
|
||||||
|
|
||||||
|
|
||||||
static Expr strictEvalExpr_(EvalState & state, Expr e, ATermMap & nfs)
|
|
||||||
{
|
|
||||||
e = evalExpr(state, e);
|
|
||||||
|
|
||||||
ATermList as;
|
|
||||||
if (matchAttrs(e, as)) {
|
|
||||||
ATermList as2 = ATempty;
|
|
||||||
for (ATermIterator i(as); i; ++i) {
|
|
||||||
ATerm name; Expr e; ATerm pos;
|
|
||||||
if (!matchBind(*i, name, e, pos)) abort(); /* can't happen */
|
|
||||||
as2 = ATinsert(as2, makeBind(name, strictEvalExpr(state, e, nfs), pos));
|
|
||||||
}
|
|
||||||
return makeAttrs(ATreverse(as2));
|
|
||||||
}
|
|
||||||
|
|
||||||
ATermList es;
|
|
||||||
if (matchList(e, es)) {
|
|
||||||
ATermList es2 = ATempty;
|
|
||||||
for (ATermIterator i(es); i; ++i)
|
|
||||||
es2 = ATinsert(es2, strictEvalExpr(state, *i, nfs));
|
|
||||||
return makeList(ATreverse(es2));
|
|
||||||
}
|
|
||||||
|
|
||||||
return e;
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
static Expr strictEvalExpr(EvalState & state, Expr e, ATermMap & nfs)
|
|
||||||
{
|
|
||||||
Expr nf = nfs.get(e);
|
|
||||||
if (nf) return nf;
|
|
||||||
|
|
||||||
nf = strictEvalExpr_(state, e, nfs);
|
|
||||||
|
|
||||||
nfs.set(e, nf);
|
|
||||||
|
|
||||||
return nf;
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
Expr strictEvalExpr(EvalState & state, Expr e)
|
|
||||||
{
|
|
||||||
ATermMap strictNormalForms;
|
|
||||||
return strictEvalExpr(state, e, strictNormalForms);
|
|
||||||
}
|
|
||||||
#endif
|
|
||||||
|
|
||||||
|
|
||||||
void EvalState::printStats()
|
void EvalState::printStats()
|
||||||
{
|
{
|
||||||
char x;
|
char x;
|
||||||
|
|
|
||||||
|
|
@ -52,50 +52,6 @@ ATerm bottomupRewrite(TermFun & f, ATerm e)
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
||||||
void queryAllAttrs(Expr e, ATermMap & attrs, bool withPos)
|
|
||||||
{
|
|
||||||
ATermList bnds;
|
|
||||||
if (!matchAttrs(e, bnds))
|
|
||||||
throw TypeError(format("value is %1% while an attribute set was expected") % showType(e));
|
|
||||||
|
|
||||||
for (ATermIterator i(bnds); i; ++i) {
|
|
||||||
ATerm name;
|
|
||||||
Expr e;
|
|
||||||
ATerm pos;
|
|
||||||
if (!matchBind(*i, name, e, pos)) abort(); /* can't happen */
|
|
||||||
attrs.set(name, withPos ? makeAttrRHS(e, pos) : e);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
Expr queryAttr(Expr e, const string & name)
|
|
||||||
{
|
|
||||||
ATerm dummy;
|
|
||||||
return queryAttr(e, name, dummy);
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
Expr queryAttr(Expr e, const string & name, ATerm & pos)
|
|
||||||
{
|
|
||||||
ATermList bnds;
|
|
||||||
if (!matchAttrs(e, bnds))
|
|
||||||
throw TypeError(format("value is %1% while an attribute set was expected") % showType(e));
|
|
||||||
|
|
||||||
for (ATermIterator i(bnds); i; ++i) {
|
|
||||||
ATerm name2, pos2;
|
|
||||||
Expr e;
|
|
||||||
if (!matchBind(*i, name2, e, pos2))
|
|
||||||
abort(); /* can't happen */
|
|
||||||
if (aterm2String(name2) == name) {
|
|
||||||
pos = pos2;
|
|
||||||
return e;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
Expr makeAttrs(const ATermMap & attrs)
|
Expr makeAttrs(const ATermMap & attrs)
|
||||||
{
|
{
|
||||||
ATermList bnds = ATempty;
|
ATermList bnds = ATempty;
|
||||||
|
|
@ -131,88 +87,6 @@ static void varsBoundByPattern(ATermMap & map, Pattern pat)
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
||||||
Expr substitute(const Substitution & subs, Expr e)
|
|
||||||
{
|
|
||||||
checkInterrupt();
|
|
||||||
|
|
||||||
//if (subs.size() == 0) return e;
|
|
||||||
|
|
||||||
ATerm name, pos, e2;
|
|
||||||
|
|
||||||
/* As an optimisation, don't substitute in subterms known to be
|
|
||||||
closed. */
|
|
||||||
if (matchClosed(e, e2)) return e;
|
|
||||||
|
|
||||||
if (matchVar(e, name)) {
|
|
||||||
Expr sub = subs.lookup(name);
|
|
||||||
if (sub == makeRemoved()) sub = 0;
|
|
||||||
Expr wrapped;
|
|
||||||
/* Add a "closed" wrapper around terms that aren't already
|
|
||||||
closed. The check is necessary to prevent repeated
|
|
||||||
wrapping, e.g., closed(closed(closed(...))), which kills
|
|
||||||
caching. */
|
|
||||||
return sub ? (matchClosed(sub, wrapped) ? sub : makeClosed(sub)) : e;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* In case of a function, filter out all variables bound by this
|
|
||||||
function. */
|
|
||||||
Pattern pat;
|
|
||||||
ATerm body;
|
|
||||||
if (matchFunction(e, pat, body, pos)) {
|
|
||||||
ATermMap map(16);
|
|
||||||
varsBoundByPattern(map, pat);
|
|
||||||
Substitution subs2(&subs, &map);
|
|
||||||
return makeFunction(
|
|
||||||
(Pattern) substitute(subs2, (Expr) pat),
|
|
||||||
substitute(subs2, body), pos);
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Idem for a mutually recursive attribute set. */
|
|
||||||
ATermList rbnds, nrbnds;
|
|
||||||
if (matchRec(e, rbnds, nrbnds)) {
|
|
||||||
ATermMap map(ATgetLength(rbnds) + ATgetLength(nrbnds));
|
|
||||||
for (ATermIterator i(rbnds); i; ++i)
|
|
||||||
if (matchBind(*i, name, e2, pos)) map.set(name, makeRemoved());
|
|
||||||
else abort(); /* can't happen */
|
|
||||||
for (ATermIterator i(nrbnds); i; ++i)
|
|
||||||
if (matchBind(*i, name, e2, pos)) map.set(name, makeRemoved());
|
|
||||||
else abort(); /* can't happen */
|
|
||||||
return makeRec(
|
|
||||||
(ATermList) substitute(Substitution(&subs, &map), (ATerm) rbnds),
|
|
||||||
(ATermList) substitute(subs, (ATerm) nrbnds));
|
|
||||||
}
|
|
||||||
|
|
||||||
if (ATgetType(e) == AT_APPL) {
|
|
||||||
AFun fun = ATgetAFun(e);
|
|
||||||
int arity = ATgetArity(fun);
|
|
||||||
ATerm args[arity];
|
|
||||||
bool changed = false;
|
|
||||||
|
|
||||||
for (int i = 0; i < arity; ++i) {
|
|
||||||
ATerm arg = ATgetArgument(e, i);
|
|
||||||
args[i] = substitute(subs, arg);
|
|
||||||
if (args[i] != arg) changed = true;
|
|
||||||
}
|
|
||||||
|
|
||||||
return changed ? (ATerm) ATmakeApplArray(fun, args) : e;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (ATgetType(e) == AT_LIST) {
|
|
||||||
unsigned int len = ATgetLength((ATermList) e);
|
|
||||||
ATerm es[len];
|
|
||||||
ATermIterator i((ATermList) e);
|
|
||||||
for (unsigned int j = 0; i; ++i, ++j)
|
|
||||||
es[j] = substitute(subs, *i);
|
|
||||||
ATermList out = ATempty;
|
|
||||||
for (unsigned int j = len; j; --j)
|
|
||||||
out = ATinsert(out, es[j - 1]);
|
|
||||||
return (ATerm) out;
|
|
||||||
}
|
|
||||||
|
|
||||||
return e;
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
/* We use memoisation to prevent exponential complexity on heavily
|
/* We use memoisation to prevent exponential complexity on heavily
|
||||||
shared ATerms (remember, an ATerm is a graph, not a tree!). Note
|
shared ATerms (remember, an ATerm is a graph, not a tree!). Note
|
||||||
that using an STL set is fine here wrt to ATerm garbage collection
|
that using an STL set is fine here wrt to ATerm garbage collection
|
||||||
|
|
@ -287,51 +161,6 @@ void checkVarDefs(const ATermMap & defs, Expr e)
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
||||||
struct Canonicalise : TermFun
|
|
||||||
{
|
|
||||||
ATerm operator () (ATerm e)
|
|
||||||
{
|
|
||||||
/* Remove position info. */
|
|
||||||
ATerm path;
|
|
||||||
int line, column;
|
|
||||||
if (matchPos(e, path, line, column))
|
|
||||||
return makeNoPos();
|
|
||||||
|
|
||||||
/* Sort attribute sets. */
|
|
||||||
ATermList _;
|
|
||||||
if (matchAttrs(e, _)) {
|
|
||||||
ATermMap attrs;
|
|
||||||
queryAllAttrs(e, attrs);
|
|
||||||
StringSet names;
|
|
||||||
for (ATermMap::const_iterator i = attrs.begin(); i != attrs.end(); ++i)
|
|
||||||
names.insert(aterm2String(i->key));
|
|
||||||
|
|
||||||
ATermList attrs2 = ATempty;
|
|
||||||
for (StringSet::reverse_iterator i = names.rbegin(); i != names.rend(); ++i)
|
|
||||||
attrs2 = ATinsert(attrs2,
|
|
||||||
makeBind(toATerm(*i), attrs.get(toATerm(*i)), makeNoPos()));
|
|
||||||
|
|
||||||
return makeAttrs(attrs2);
|
|
||||||
}
|
|
||||||
|
|
||||||
return e;
|
|
||||||
}
|
|
||||||
};
|
|
||||||
|
|
||||||
|
|
||||||
Expr canonicaliseExpr(Expr e)
|
|
||||||
{
|
|
||||||
Canonicalise canonicalise;
|
|
||||||
return bottomupRewrite(canonicalise, e);
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
Expr makeBool(bool b)
|
|
||||||
{
|
|
||||||
return b ? eTrue : eFalse;
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
bool matchStr(Expr e, string & s, PathSet & context)
|
bool matchStr(Expr e, string & s, PathSet & context)
|
||||||
{
|
{
|
||||||
ATermList l;
|
ATermList l;
|
||||||
|
|
@ -354,50 +183,4 @@ Expr makeStr(const string & s, const PathSet & context)
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
||||||
string showType(Expr e)
|
|
||||||
{
|
|
||||||
ATerm t1, t2;
|
|
||||||
ATermList l1;
|
|
||||||
ATermBlob b1;
|
|
||||||
int i1;
|
|
||||||
Pattern p1;
|
|
||||||
if (matchStr(e, t1, l1)) return "a string";
|
|
||||||
if (matchPath(e, t1)) return "a path";
|
|
||||||
if (matchNull(e)) return "null";
|
|
||||||
if (matchInt(e, i1)) return "an integer";
|
|
||||||
if (matchBool(e, t1)) return "a boolean";
|
|
||||||
if (matchFunction(e, p1, t1, t2)) return "a function";
|
|
||||||
if (matchAttrs(e, l1)) return "an attribute set";
|
|
||||||
if (matchList(e, l1)) return "a list";
|
|
||||||
if (matchPrimOp(e, i1, b1, l1)) return "a partially applied built-in function";
|
|
||||||
return "an unknown type";
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
string showValue(Expr e)
|
|
||||||
{
|
|
||||||
PathSet context;
|
|
||||||
string s;
|
|
||||||
ATerm s2;
|
|
||||||
int i;
|
|
||||||
if (matchStr(e, s, context)) {
|
|
||||||
string u;
|
|
||||||
for (string::iterator i = s.begin(); i != s.end(); ++i)
|
|
||||||
if (*i == '\"' || *i == '\\') u += "\\" + *i;
|
|
||||||
else if (*i == '\n') u += "\\n";
|
|
||||||
else if (*i == '\r') u += "\\r";
|
|
||||||
else if (*i == '\t') u += "\\t";
|
|
||||||
else u += *i;
|
|
||||||
return "\"" + u + "\"";
|
|
||||||
}
|
|
||||||
if (matchPath(e, s2)) return aterm2String(s2);
|
|
||||||
if (matchNull(e)) return "null";
|
|
||||||
if (matchInt(e, i)) return (format("%1%") % i).str();
|
|
||||||
if (e == eTrue) return "true";
|
|
||||||
if (e == eFalse) return "false";
|
|
||||||
/* !!! incomplete */
|
|
||||||
return "<unknown>";
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
}
|
}
|
||||||
|
|
|
||||||
|
|
@ -34,34 +34,10 @@ typedef ATerm ATermBool;
|
||||||
typedef vector<ATerm> ATermVector;
|
typedef vector<ATerm> ATermVector;
|
||||||
|
|
||||||
|
|
||||||
/* A substitution is a linked list of ATermMaps that map names to
|
|
||||||
identifiers. We use a list of ATermMaps rather than a single to
|
|
||||||
make it easy to grow or shrink a substitution when entering a
|
|
||||||
scope. */
|
|
||||||
struct Substitution
|
|
||||||
{
|
|
||||||
ATermMap * map;
|
|
||||||
const Substitution * prev;
|
|
||||||
|
|
||||||
Substitution(const Substitution * prev, ATermMap * map)
|
|
||||||
{
|
|
||||||
this->prev = prev;
|
|
||||||
this->map = map;
|
|
||||||
}
|
|
||||||
|
|
||||||
Expr lookup(Expr name) const
|
|
||||||
{
|
|
||||||
Expr x;
|
|
||||||
for (const Substitution * s(this); s; s = s->prev)
|
|
||||||
if ((x = s->map->get(name))) return x;
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
};
|
|
||||||
|
|
||||||
|
|
||||||
/* Show a position. */
|
/* Show a position. */
|
||||||
string showPos(ATerm pos);
|
string showPos(ATerm pos);
|
||||||
|
|
||||||
|
|
||||||
/* Generic bottomup traversal over ATerms. The traversal first
|
/* Generic bottomup traversal over ATerms. The traversal first
|
||||||
recursively descends into subterms, and then applies the given term
|
recursively descends into subterms, and then applies the given term
|
||||||
function to the resulting term. */
|
function to the resulting term. */
|
||||||
|
|
@ -73,37 +49,15 @@ struct TermFun
|
||||||
ATerm bottomupRewrite(TermFun & f, ATerm e);
|
ATerm bottomupRewrite(TermFun & f, ATerm e);
|
||||||
|
|
||||||
|
|
||||||
/* Query all attributes in an attribute set expression. The
|
|
||||||
expression must be in normal form. */
|
|
||||||
void queryAllAttrs(Expr e, ATermMap & attrs, bool withPos = false);
|
|
||||||
|
|
||||||
/* Query a specific attribute from an attribute set expression. The
|
|
||||||
expression must be in normal form. */
|
|
||||||
Expr queryAttr(Expr e, const string & name);
|
|
||||||
Expr queryAttr(Expr e, const string & name, ATerm & pos);
|
|
||||||
|
|
||||||
/* Create an attribute set expression from an Attrs value. */
|
/* Create an attribute set expression from an Attrs value. */
|
||||||
Expr makeAttrs(const ATermMap & attrs);
|
Expr makeAttrs(const ATermMap & attrs);
|
||||||
|
|
||||||
|
|
||||||
/* Perform a set of substitutions on an expression. */
|
|
||||||
Expr substitute(const Substitution & subs, Expr e);
|
|
||||||
|
|
||||||
|
|
||||||
/* Check whether all variables are defined in the given expression.
|
/* Check whether all variables are defined in the given expression.
|
||||||
Throw an exception if this isn't the case. */
|
Throw an exception if this isn't the case. */
|
||||||
void checkVarDefs(const ATermMap & def, Expr e);
|
void checkVarDefs(const ATermMap & def, Expr e);
|
||||||
|
|
||||||
|
|
||||||
/* Canonicalise a Nix expression by sorting attributes and removing
|
|
||||||
location information. */
|
|
||||||
Expr canonicaliseExpr(Expr e);
|
|
||||||
|
|
||||||
|
|
||||||
/* Create an expression representing a boolean. */
|
|
||||||
Expr makeBool(bool b);
|
|
||||||
|
|
||||||
|
|
||||||
/* Manipulation of Str() nodes. Note: matchStr() does not clear
|
/* Manipulation of Str() nodes. Note: matchStr() does not clear
|
||||||
context! */
|
context! */
|
||||||
bool matchStr(Expr e, string & s, PathSet & context);
|
bool matchStr(Expr e, string & s, PathSet & context);
|
||||||
|
|
@ -111,12 +65,6 @@ bool matchStr(Expr e, string & s, PathSet & context);
|
||||||
Expr makeStr(const string & s, const PathSet & context = PathSet());
|
Expr makeStr(const string & s, const PathSet & context = PathSet());
|
||||||
|
|
||||||
|
|
||||||
/* Showing types, values. */
|
|
||||||
string showType(Expr e);
|
|
||||||
|
|
||||||
string showValue(Expr e);
|
|
||||||
|
|
||||||
|
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
||||||
|
|
|
||||||
|
|
@ -42,7 +42,7 @@ void processExpr(EvalState & state, const Strings & attrPaths,
|
||||||
bool evalOnly, bool xmlOutput, Expr e)
|
bool evalOnly, bool xmlOutput, Expr e)
|
||||||
{
|
{
|
||||||
if (parseOnly)
|
if (parseOnly)
|
||||||
std::cout << format("%1%\n") % canonicaliseExpr(e);
|
std::cout << format("%1%\n");
|
||||||
else
|
else
|
||||||
foreach (Strings::const_iterator, i, attrPaths) {
|
foreach (Strings::const_iterator, i, attrPaths) {
|
||||||
Value v;
|
Value v;
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue