* 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
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@ -27,7 +27,14 @@ std::ostream & operator << (std::ostream & str, Value & v)
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str << (v.boolean ? "true" : "false");
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break;
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case tString:
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str << "\"" << v.string.s << "\""; // !!! escaping
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str << "\"";
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for (const char * i = v.string.s; *i; i++)
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if (*i == '\"' || *i == '\\') str << "\\" << *i;
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else if (*i == '\n') str << "\\n";
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else if (*i == '\r') str << "\\r";
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else if (*i == '\t') str << "\\t";
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else str << *i;
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str << "\"";
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break;
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case tPath:
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str << v.path; // !!! escaping?
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@ -930,497 +937,6 @@ bool EvalState::eqValues(Value & v1, Value & v2)
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}
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#if 0
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/* Pattern-match `pat' against `arg'. The result is a set of
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substitutions (`subs') and a set of recursive substitutions
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(`subsRecursive'). The latter can refer to the variables bound by
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both `subs' and `subsRecursive'. */
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static void patternMatch(EvalState & state,
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Pattern pat, Expr arg, ATermMap & subs, ATermMap & subsRecursive)
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{
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ATerm name;
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ATermList formals;
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ATermBool ellipsis;
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if (matchVarPat(pat, name))
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subs.set(name, arg);
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else if (matchAttrsPat(pat, formals, ellipsis, name)) {
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arg = evalExpr(state, arg);
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if (name != sNoAlias) subs.set(name, arg);
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/* Get the actual arguments. */
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ATermMap attrs;
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queryAllAttrs(arg, attrs);
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unsigned int nrAttrs = attrs.size();
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/* For each formal argument, get the actual argument. If
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there is no matching actual argument but the formal
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argument has a default, use the default. */
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unsigned int attrsUsed = 0;
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for (ATermIterator i(formals); i; ++i) {
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Expr name, def;
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DefaultValue def2;
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if (!matchFormal(*i, name, def2)) abort(); /* can't happen */
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Expr value = attrs[name];
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if (value == 0) {
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if (!matchDefaultValue(def2, def)) def = 0;
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if (def == 0) throw TypeError(format("the argument named `%1%' required by the function is missing")
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% aterm2String(name));
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subsRecursive.set(name, def);
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} else {
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attrsUsed++;
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attrs.remove(name);
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subs.set(name, value);
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}
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}
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/* Check that each actual argument is listed as a formal
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argument (unless the attribute match specifies a `...'). */
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if (ellipsis == eFalse && attrsUsed != nrAttrs)
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throw TypeError(format("the function does not expect an argument named `%1%'")
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% aterm2String(attrs.begin()->key));
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}
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else abort();
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}
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/* Substitute an argument set into the body of a function. */
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static Expr substArgs(EvalState & state,
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Expr body, Pattern pat, Expr arg)
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{
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ATermMap subs(16), subsRecursive(16);
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patternMatch(state, pat, arg, subs, subsRecursive);
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/* If we used any default values, make a recursive attribute set
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out of the (argument-name, value) tuples. This is so that we
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can support default values that refer to each other, e.g. ({x,
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y ? x + x}: y) {x = "foo";} evaluates to "foofoo". */
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if (subsRecursive.size() != 0) {
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ATermList recAttrs = ATempty;
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foreach (ATermMap::const_iterator, i, subs)
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recAttrs = ATinsert(recAttrs, makeBind(i->key, i->value, makeNoPos()));
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foreach (ATermMap::const_iterator, i, subsRecursive)
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recAttrs = ATinsert(recAttrs, makeBind(i->key, i->value, makeNoPos()));
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Expr rec = makeRec(recAttrs, ATempty);
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foreach (ATermMap::const_iterator, i, subsRecursive)
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subs.set(i->key, makeSelect(rec, i->key));
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}
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return substitute(Substitution(0, &subs), body);
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}
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/* Transform a mutually recursive set into a non-recursive set. Each
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attribute is transformed into an expression that has all references
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to attributes substituted with selection expressions on the
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original set. E.g., e = `rec {x = f x y; y = x;}' becomes `{x = f
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(e.x) (e.y); y = e.x;}'. */
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LocalNoInline(ATerm expandRec(EvalState & state, ATerm e, ATermList rbnds, ATermList nrbnds))
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{
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ATerm name;
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Expr e2;
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Pos pos;
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Expr eOverrides = 0;
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/* Create the substitution list. */
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ATermMap subs(ATgetLength(rbnds) + ATgetLength(nrbnds));
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for (ATermIterator i(rbnds); i; ++i) {
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if (!matchBind(*i, name, e2, pos)) abort(); /* can't happen */
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subs.set(name, makeSelect(e, name));
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}
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for (ATermIterator i(nrbnds); i; ++i) {
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if (!matchBind(*i, name, e2, pos)) abort(); /* can't happen */
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if (name == sOverrides) eOverrides = e2;
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subs.set(name, e2);
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}
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/* If the rec contains an attribute called `__overrides', then
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evaluate it, and add the attributes in that set to the rec.
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This allows overriding of recursive attributes, which is
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otherwise not possible. (You can use the // operator to
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replace an attribute, but other attributes in the rec will
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still reference the original value, because that value has been
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substituted into the bodies of the other attributes. Hence we
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need __overrides.) */
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ATermMap overrides;
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if (eOverrides) {
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eOverrides = evalExpr(state, eOverrides);
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queryAllAttrs(eOverrides, overrides, false);
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foreach (ATermMap::const_iterator, i, overrides)
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subs.set(i->key, i->value);
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}
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Substitution subs_(0, &subs);
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/* Create the non-recursive set. */
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ATermMap as(ATgetLength(rbnds) + ATgetLength(nrbnds));
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for (ATermIterator i(rbnds); i; ++i) {
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if (!matchBind(*i, name, e2, pos)) abort(); /* can't happen */
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as.set(name, makeAttrRHS(substitute(subs_, e2), pos));
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}
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if (eOverrides)
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foreach (ATermMap::const_iterator, i, overrides)
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as.set(i->key, makeAttrRHS(i->value, makeNoPos()));
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/* Copy the non-recursive bindings. !!! inefficient */
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for (ATermIterator i(nrbnds); i; ++i) {
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if (!matchBind(*i, name, e2, pos)) abort(); /* can't happen */
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as.set(name, makeAttrRHS(e2, pos));
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}
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return makeAttrs(as);
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}
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static void flattenList(EvalState & state, Expr e, ATermList & result)
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{
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ATermList es;
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e = evalExpr(state, e);
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if (matchList(e, es))
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for (ATermIterator i(es); i; ++i)
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flattenList(state, *i, result);
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else
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result = ATinsert(result, e);
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}
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ATermList flattenList(EvalState & state, Expr e)
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{
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ATermList result = ATempty;
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flattenList(state, e, result);
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return ATreverse(result);
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}
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/* Evaluation of various language constructs. These have been taken
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out of evalExpr2 to reduce stack space usage. (GCC is really dumb
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about stack space: it just adds up all the local variables and
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temporaries of every scope into one huge stack frame. This is
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really bad for deeply recursive functions.) */
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LocalNoInline(Expr evalVar(EvalState & state, ATerm name))
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{
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ATerm primOp = state.primOps.get(name);
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if (!primOp)
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throw EvalError(format("impossible: undefined variable `%1%'") % aterm2String(name));
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int arity;
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ATermBlob fun;
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if (!matchPrimOpDef(primOp, arity, fun)) abort();
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if (arity == 0)
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/* !!! backtrace for primop call */
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return ((PrimOp) ATgetBlobData(fun)) (state, ATermVector());
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else
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return makePrimOp(arity, fun, ATempty);
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}
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LocalNoInline(Expr evalCall(EvalState & state, Expr fun, Expr arg))
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{
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Pattern pat;
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ATerm pos;
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Expr body;
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/* Evaluate the left-hand side. */
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fun = evalExpr(state, fun);
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/* Is it a primop or a function? */
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int arity;
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ATermBlob funBlob;
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ATermList args;
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if (matchPrimOp(fun, arity, funBlob, args)) {
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args = ATinsert(args, arg);
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if (ATgetLength(args) == arity) {
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/* Put the arguments in a vector in reverse (i.e.,
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actual) order. */
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ATermVector args2(arity);
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for (ATermIterator i(args); i; ++i)
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args2[--arity] = *i;
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/* !!! backtrace for primop call */
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return ((PrimOp) ATgetBlobData(funBlob))
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(state, args2);
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} else
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/* Need more arguments, so propagate the primop. */
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return makePrimOp(arity, funBlob, args);
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}
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else if (matchFunction(fun, pat, body, pos)) {
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try {
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return evalExpr(state, substArgs(state, body, pat, arg));
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} catch (Error & e) {
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addErrorPrefix(e, "while evaluating the function at %1%:\n",
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showPos(pos));
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throw;
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}
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}
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else throwTypeError(
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"attempt to call something which is neither a function nor a primop (built-in operation) but %1%",
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showType(fun));
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}
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LocalNoInline(Expr evalWith(EvalState & state, Expr defs, Expr body, ATerm pos))
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{
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ATermMap attrs;
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try {
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defs = evalExpr(state, defs);
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queryAllAttrs(defs, attrs);
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} catch (Error & e) {
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addErrorPrefix(e, "while evaluating the `with' definitions at %1%:\n",
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showPos(pos));
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throw;
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}
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try {
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body = substitute(Substitution(0, &attrs), body);
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checkVarDefs(state.primOps, body);
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return evalExpr(state, body);
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} catch (Error & e) {
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addErrorPrefix(e, "while evaluating the `with' body at %1%:\n",
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showPos(pos));
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throw;
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}
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}
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/* Implementation of the `==' and `!=' operators. */
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LocalNoInline(bool areEqual(EvalState & state, Expr e1, Expr e2))
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{
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e1 = evalExpr(state, e1);
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e2 = evalExpr(state, e2);
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/* We cannot test functions/primops for equality, and we currently
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don't support testing equality between attribute sets or lists
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- that would have to be a deep equality test to be sound. */
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AFun sym1 = ATgetAFun(e1);
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AFun sym2 = ATgetAFun(e2);
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if (sym1 != sym2) return false;
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/* Functions are incomparable. */
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if (sym1 == symFunction || sym1 == symPrimOp) return false;
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if (!state.allowUnsafeEquality && sym1 == symAttrs)
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throw EvalError("comparison of attribute sets is not implemented");
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/* !!! This allows comparisons of infinite data structures to
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succeed, such as `let x = [x]; in x == x'. This is
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undesirable, since equivalent (?) terms such as `let x = [x]; y
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= [y]; in x == y' don't terminate. */
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if (e1 == e2) return true;
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if (sym1 == symList) {
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ATermList es1; matchList(e1, es1);
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ATermList es2; matchList(e2, es2);
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if (ATgetLength(es1) != ATgetLength(es2)) return false;
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ATermIterator i(es1), j(es2);
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while (*i) {
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if (!areEqual(state, *i, *j)) return false;
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++i; ++j;
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}
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return true;
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}
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return false;
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}
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Expr evalExpr2(EvalState & state, Expr e)
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{
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/* When changing this function, make sure that you don't cause a
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(large) increase in stack consumption! */
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char x;
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if (&x < deepestStack) deepestStack = &x;
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Expr e1, e2, e3;
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ATerm name, pos;
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AFun sym = ATgetAFun(e);
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/* Normal forms. */
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if (sym == symStr ||
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sym == symPath ||
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sym == symNull ||
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sym == symInt ||
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sym == symBool ||
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sym == symFunction ||
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sym == symAttrs ||
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sym == symList ||
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sym == symPrimOp)
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return e;
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/* The `Closed' constructor is just a way to prevent substitutions
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into expressions not containing free variables. */
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if (matchClosed(e, e1))
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return evalExpr(state, e1);
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/* Any encountered variables must be primops (since undefined
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variables are detected after parsing). */
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if (matchVar(e, name)) return evalVar(state, name);
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/* Function application. */
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if (matchCall(e, e1, e2)) return evalCall(state, e1, e2);
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/* Attribute selection. */
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if (matchSelect(e, e1, name)) return evalSelect(state, e1, name);
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/* Mutually recursive sets. */
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ATermList rbnds, nrbnds;
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if (matchRec(e, rbnds, nrbnds))
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return expandRec(state, e, rbnds, nrbnds);
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/* Conditionals. */
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if (matchIf(e, e1, e2, e3))
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return evalExpr(state, evalBool(state, e1) ? e2 : e3);
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/* Assertions. */
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if (matchAssert(e, e1, e2, pos)) return evalAssert(state, e1, e2, pos);
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/* Withs. */
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if (matchWith(e, e1, e2, pos)) return evalWith(state, e1, e2, pos);
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/* Generic equality/inequality. Note that the behaviour on
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composite data (lists, attribute sets) and functions is
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undefined, since the subterms of those terms are not evaluated.
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However, we don't want to make (==) strict, because that would
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make operations like `big_derivation == null' very slow (unless
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we were to evaluate them side-by-side). */
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if (matchOpEq(e, e1, e2)) return makeBool(areEqual(state, e1, e2));
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if (matchOpNEq(e, e1, e2)) return makeBool(!areEqual(state, e1, e2));
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/* Negation. */
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if (matchOpNot(e, e1))
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return makeBool(!evalBool(state, e1));
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/* Implication. */
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if (matchOpImpl(e, e1, e2))
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return makeBool(!evalBool(state, e1) || evalBool(state, e2));
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/* Conjunction (logical AND). */
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if (matchOpAnd(e, e1, e2))
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return makeBool(evalBool(state, e1) && evalBool(state, e2));
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/* Disjunction (logical OR). */
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if (matchOpOr(e, e1, e2))
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return makeBool(evalBool(state, e1) || evalBool(state, e2));
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/* Attribute set update (//). */
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if (matchOpUpdate(e, e1, e2))
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return updateAttrs(evalExpr(state, e1), evalExpr(state, e2));
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/* Attribute existence test (?). */
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if (matchOpHasAttr(e, e1, name)) return evalHasAttr(state, e1, name);
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/* String or path concatenation. */
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if (sym == symOpPlus || sym == symConcatStrings)
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return evalPlusConcat(state, e);
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/* Backwards compatability: subpath operator (~). */
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if (matchSubPath(e, e1, e2)) return evalSubPath(state, e1, e2);
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/* List concatenation. */
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if (matchOpConcat(e, e1, e2)) return evalOpConcat(state, e1, e2);
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/* Barf. */
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abort();
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}
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Expr evalExpr(EvalState & state, Expr e)
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{
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checkInterrupt();
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#if 0
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startNest(nest, lvlVomit,
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format("evaluating expression: %1%") % e);
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#endif
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state.nrEvaluated++;
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/* Consult the memo table to quickly get the normal form of
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previously evaluated expressions. */
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Expr nf = state.normalForms.get(e);
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if (nf) {
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if (nf == makeBlackHole())
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throwEvalError("infinite recursion encountered");
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state.nrCached++;
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return nf;
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}
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/* Otherwise, evaluate and memoize. */
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state.normalForms.set(e, makeBlackHole());
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try {
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nf = evalExpr2(state, e);
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} catch (Error & err) {
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state.normalForms.remove(e);
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throw;
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}
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state.normalForms.set(e, nf);
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return nf;
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}
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static Expr strictEvalExpr(EvalState & state, Expr e, ATermMap & nfs);
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static Expr strictEvalExpr_(EvalState & state, Expr e, ATermMap & nfs)
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{
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e = evalExpr(state, e);
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ATermList as;
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if (matchAttrs(e, as)) {
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ATermList as2 = ATempty;
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||||
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()
|
||||
{
|
||||
char x;
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue