* Use a symbol table to represent identifiers and attribute names
efficiently. The symbol table ensures that there is only one copy of each symbol, thus allowing symbols to be compared efficiently using a pointer equality test.
This commit is contained in:
Eelco Dolstra
parent
10e8b1fd15
commit
ac1e8f40d4
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@ -8,7 +8,7 @@ libexpr_la_SOURCES = \
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pkginclude_HEADERS = \
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nixexpr.hh eval.hh parser.hh lexer-tab.hh parser-tab.hh \
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get-drvs.hh attr-path.hh value-to-xml.hh common-opts.hh \
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names.hh
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names.hh symbol-table.hh
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libexpr_la_LIBADD = ../libutil/libutil.la ../libstore/libstore.la \
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../boost/format/libformat.la
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@ -45,7 +45,7 @@ void findAlongAttrPath(EvalState & state, const string & attrPath,
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format("the expression selected by the selection path `%1%' should be an attribute set but is %2%")
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% curPath % showType(v));
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Bindings::iterator a = v.attrs->find(attr);
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Bindings::iterator a = v.attrs->find(state.symbols.create(attr));
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if (a == v.attrs->end())
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throw Error(format("attribute `%1%' in selection path `%2%' not found") % attr % curPath);
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v = a->second;
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@ -20,10 +20,10 @@ bool parseOptionArg(const string & arg, Strings::iterator & i,
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if (i == argsEnd) throw error;
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string value = *i++;
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Value & v(autoArgs[name]);
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Value & v(autoArgs[state.symbols.create(name)]);
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if (arg == "--arg")
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state.mkThunk_(v, parseExprFromString(value, absPath(".")));
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state.mkThunk_( v, parseExprFromString(state, value, absPath(".")));
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else
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mkString(v, value);
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@ -12,7 +12,7 @@ using namespace nix;
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void doTest(EvalState & state, string s)
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{
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Expr * e = parseExprFromString(s, absPath("."));
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Expr * e = parseExprFromString(state, s, absPath("."));
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std::cerr << ">>>>> " << *e << std::endl;
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Value v;
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state.eval(e, v);
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@ -23,6 +23,29 @@ void doTest(EvalState & state, string s)
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void run(Strings args)
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{
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SymbolTable t;
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printMsg(lvlError, format("size of symbol: %1% bytes") % sizeof(Symbol));
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Symbol s1 = t.create("foo");
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Symbol s2 = t.create("foo");
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Symbol s3 = t.create("bar");
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Symbol s4 = t.create("foo");
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assert(s1 == s2);
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assert(s1 == s4);
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assert(s1 != s3);
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std::map<Symbol, int> m;
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m[s1] = 123;
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m[s3] = 456;
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std::cout << m[s1] << std::endl;
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std::cout << m[s2] << std::endl;
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std::cout << m[s3] << std::endl;
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std::cout << m[s4] << std::endl;
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EvalState state;
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printMsg(lvlError, format("size of value: %1% bytes") % sizeof(Value));
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@ -43,8 +43,8 @@ std::ostream & operator << (std::ostream & str, Value & v)
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break;
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case tAttrs:
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str << "{ ";
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foreach (Bindings::iterator, i, *v.attrs)
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str << i->first << " = " << i->second << "; ";
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foreach (Bindings::iterator, i, *v.attrs)
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str << (string) i->first << " = " << i->second << "; ";
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str << "}";
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break;
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case tList:
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@ -91,7 +91,14 @@ string showType(Value & v)
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}
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EvalState::EvalState() : baseEnv(allocEnv())
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EvalState::EvalState()
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: sWith(symbols.create("<with>"))
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, sOutPath(symbols.create("outPath"))
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, sDrvPath(symbols.create("drvPath"))
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, sType(symbols.create("type"))
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, sMeta(symbols.create("meta"))
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, sName(symbols.create("name"))
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, baseEnv(allocEnv())
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{
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nrValues = nrEnvs = nrEvaluated = recursionDepth = maxRecursionDepth = 0;
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deepestStack = (char *) -1;
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@ -110,9 +117,9 @@ EvalState::~EvalState()
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void EvalState::addConstant(const string & name, Value & v)
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{
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baseEnv.bindings[name] = v;
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baseEnv.bindings[symbols.create(name)] = v;
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string name2 = string(name, 0, 2) == "__" ? string(name, 2) : name;
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(*baseEnv.bindings["builtins"].attrs)[name2] = v;
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(*baseEnv.bindings[symbols.create("builtins")].attrs)[symbols.create(name2)] = v;
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nrValues += 2;
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}
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@ -124,9 +131,9 @@ void EvalState::addPrimOp(const string & name,
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v.type = tPrimOp;
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v.primOp.arity = arity;
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v.primOp.fun = primOp;
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baseEnv.bindings[name] = v;
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baseEnv.bindings[symbols.create(name)] = v;
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string name2 = string(name, 0, 2) == "__" ? string(name, 2) : name;
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(*baseEnv.bindings["builtins"].attrs)[name2] = v;
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(*baseEnv.bindings[symbols.create("builtins")].attrs)[symbols.create(name2)] = v;
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nrValues += 2;
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}
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@ -225,12 +232,12 @@ void mkPath(Value & v, const char * s)
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}
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static Value * lookupWith(Env * env, const Sym & name)
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Value * EvalState::lookupWith(Env * env, const Symbol & name)
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{
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if (!env) return 0;
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Value * v = lookupWith(env->up, name);
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if (v) return v;
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Bindings::iterator i = env->bindings.find("<with>");
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Bindings::iterator i = env->bindings.find(sWith);
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if (i == env->bindings.end()) return 0;
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Bindings::iterator j = i->second.attrs->find(name);
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if (j != i->second.attrs->end()) return &j->second;
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@ -238,7 +245,7 @@ static Value * lookupWith(Env * env, const Sym & name)
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}
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static Value * lookupVar(Env * env, const Sym & name)
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Value * EvalState::lookupVar(Env * env, const Symbol & name)
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{
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/* First look for a regular variable binding for `name'. */
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for (Env * env2 = env; env2; env2 = env2->up) {
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@ -318,7 +325,7 @@ void EvalState::evalFile(const Path & path, Value & v)
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Expr * e = parseTrees[path];
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if (!e) {
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e = parseExprFromFile(path);
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e = parseExprFromFile(*this, path);
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parseTrees[path] = e;
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}
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@ -428,9 +435,9 @@ void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
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/* The inherited attributes, on the other hand, are
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evaluated in the original environment. */
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foreach (list<string>::iterator, i, inherited) {
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foreach (list<Symbol>::iterator, i, inherited) {
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Value & v2 = env2.bindings[*i];
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mkCopy(v2, *lookupVar(&env, *i));
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mkCopy(v2, *state.lookupVar(&env, *i));
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}
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}
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@ -441,9 +448,9 @@ void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
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mkThunk(v2, env, i->second);
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}
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foreach (list<string>::iterator, i, inherited) {
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foreach (list<Symbol>::iterator, i, inherited) {
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Value & v2 = (*v.attrs)[*i];
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mkCopy(v2, *lookupVar(&env, *i));
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mkCopy(v2, *state.lookupVar(&env, *i));
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}
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}
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}
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@ -459,7 +466,7 @@ void ExprList::eval(EvalState & state, Env & env, Value & v)
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void ExprVar::eval(EvalState & state, Env & env, Value & v)
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{
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Value * v2 = lookupVar(&env, name);
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Value * v2 = state.lookupVar(&env, name);
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state.forceValue(*v2);
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v = *v2;
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}
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@ -631,7 +638,7 @@ void ExprWith::eval(EvalState & state, Env & env, Value & v)
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Env & env2(state.allocEnv());
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env2.up = &env;
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Value & vAttrs = env2.bindings["<with>"];
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Value & vAttrs = env2.bindings[state.sWith];
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state.eval(env, attrs, vAttrs);
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state.forceAttrs(vAttrs);
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@ -871,7 +878,7 @@ string EvalState::forceStringNoCtx(Value & v)
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bool EvalState::isDerivation(Value & v)
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{
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if (v.type != tAttrs) return false;
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Bindings::iterator i = v.attrs->find("type");
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Bindings::iterator i = v.attrs->find(sType);
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return i != v.attrs->end() && forceStringNoCtx(i->second) == "derivation";
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}
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@ -915,7 +922,7 @@ string EvalState::coerceToString(Value & v, PathSet & context,
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}
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if (v.type == tAttrs) {
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Bindings::iterator i = v.attrs->find("outPath");
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Bindings::iterator i = v.attrs->find(sOutPath);
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if (i == v.attrs->end())
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throwTypeError("cannot coerce an attribute set (except a derivation) to a string");
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return coerceToString(i->second, context, coerceMore, copyToStore);
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@ -4,6 +4,7 @@
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#include <map>
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#include "nixexpr.hh"
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#include "symbol-table.hh"
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namespace nix {
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@ -14,9 +15,7 @@ class EvalState;
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struct Env;
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struct Value;
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typedef string Sym;
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typedef std::map<Sym, Value> Bindings;
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typedef std::map<Symbol, Value> Bindings;
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struct Env
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@ -161,6 +160,10 @@ class EvalState
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public:
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DrvHashes drvHashes; /* normalised derivation hashes */
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SymbolTable symbols;
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const Symbol sWith, sOutPath, sDrvPath, sType, sMeta, sName;
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private:
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SrcToStore srcToStore;
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@ -235,6 +238,13 @@ private:
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void addPrimOp(const string & name,
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unsigned int arity, PrimOp primOp);
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Value * lookupVar(Env * env, const Symbol & name);
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Value * lookupWith(Env * env, const Symbol & name);
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friend class ExprVar;
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friend class ExprAttrs;
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public:
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/* Do a deep equality test between two values. That is, list
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@ -8,7 +8,7 @@ namespace nix {
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string DrvInfo::queryDrvPath(EvalState & state) const
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{
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if (drvPath == "") {
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Bindings::iterator i = attrs->find("drvPath");
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Bindings::iterator i = attrs->find(state.sDrvPath);
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PathSet context;
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(string &) drvPath = i != attrs->end() ? state.coerceToPath(i->second, context) : "";
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}
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@ -19,7 +19,7 @@ string DrvInfo::queryDrvPath(EvalState & state) const
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string DrvInfo::queryOutPath(EvalState & state) const
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{
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if (outPath == "") {
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Bindings::iterator i = attrs->find("outPath");
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Bindings::iterator i = attrs->find(state.sOutPath);
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PathSet context;
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(string &) outPath = i != attrs->end() ? state.coerceToPath(i->second, context) : "";
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}
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@ -31,7 +31,7 @@ MetaInfo DrvInfo::queryMetaInfo(EvalState & state) const
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{
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MetaInfo meta;
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Bindings::iterator a = attrs->find("meta");
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Bindings::iterator a = attrs->find(state.sMeta);
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if (a == attrs->end()) return meta; /* fine, empty meta information */
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state.forceAttrs(a->second);
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@ -113,12 +113,12 @@ static bool getDerivation(EvalState & state, Value & v,
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DrvInfo drv;
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Bindings::iterator i = v.attrs->find("name");
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Bindings::iterator i = v.attrs->find(state.sName);
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/* !!! We really would like to have a decent back trace here. */
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if (i == v.attrs->end()) throw TypeError("derivation name missing");
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drv.name = state.forceStringNoCtx(i->second);
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i = v.attrs->find("system");
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i = v.attrs->find(state.symbols.create("system"));
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if (i == v.attrs->end())
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drv.system = "unknown";
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else
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@ -170,7 +170,7 @@ static void getDerivations(EvalState & state, Value & vIn,
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/* !!! undocumented hackery to support combining channels in
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nix-env.cc. */
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bool combineChannels = v.attrs->find("_combineChannels") != v.attrs->end();
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bool combineChannels = v.attrs->find(state.symbols.create("_combineChannels")) != v.attrs->end();
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/* Consider the attributes in sorted order to get more
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deterministic behaviour in nix-env operations (e.g. when
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@ -184,7 +184,7 @@ static void getDerivations(EvalState & state, Value & vIn,
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foreach (StringSet::iterator, i, attrs) {
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startNest(nest, lvlDebug, format("evaluating attribute `%1%'") % *i);
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string pathPrefix2 = addToPath(pathPrefix, *i);
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Value & v2((*v.attrs)[*i]);
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Value & v2((*v.attrs)[state.symbols.create(*i)]);
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if (combineChannels)
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getDerivations(state, v2, pathPrefix2, autoArgs, drvs, done);
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else if (getDerivation(state, v2, pathPrefix2, drvs, done)) {
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@ -193,7 +193,7 @@ static void getDerivations(EvalState & state, Value & vIn,
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if it has a `recurseForDerivations = true'
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attribute. */
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if (v2.type == tAttrs) {
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Bindings::iterator j = v2.attrs->find("recurseForDerivations");
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Bindings::iterator j = v2.attrs->find(state.symbols.create("recurseForDerivations"));
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if (j != v2.attrs->end() && state.forceBool(j->second))
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getDerivations(state, v2, pathPrefix2, autoArgs, drvs, done);
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}
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@ -54,7 +54,7 @@ void ExprAttrs::show(std::ostream & str)
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{
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if (recursive) str << "rec ";
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str << "{ ";
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foreach (list<string>::iterator, i, inherited)
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foreach (list<Symbol>::iterator, i, inherited)
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str << "inherit " << *i << "; ";
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foreach (Attrs::iterator, i, attrs)
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str << i->first << " = " << *i->second << "; ";
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@ -81,9 +81,9 @@ void ExprLambda::show(std::ostream & str)
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if (i->def) str << " ? " << *i->def;
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}
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str << " }";
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if (arg != "") str << " @ ";
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if (!arg.empty()) str << " @ ";
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}
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if (arg != "") str << arg;
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if (!arg.empty()) str << arg;
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str << ": " << *body << ")";
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}
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@ -3,7 +3,7 @@
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#include <map>
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#include "types.hh"
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#include "symbol-table.hh"
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namespace nix {
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@ -75,33 +75,33 @@ struct ExprPath : Expr
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struct ExprVar : Expr
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{
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string name;
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ExprVar(const string & name) : name(name) { };
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Symbol name;
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ExprVar(const Symbol & name) : name(name) { };
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COMMON_METHODS
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};
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struct ExprSelect : Expr
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{
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Expr * e;
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string name;
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ExprSelect(Expr * e, const string & name) : e(e), name(name) { };
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Symbol name;
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ExprSelect(Expr * e, const Symbol & name) : e(e), name(name) { };
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COMMON_METHODS
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};
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struct ExprOpHasAttr : Expr
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{
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Expr * e;
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string name;
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ExprOpHasAttr(Expr * e, const string & name) : e(e), name(name) { };
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Symbol name;
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ExprOpHasAttr(Expr * e, const Symbol & name) : e(e), name(name) { };
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COMMON_METHODS
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};
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struct ExprAttrs : Expr
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{
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bool recursive;
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typedef std::map<string, Expr *> Attrs;
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typedef std::map<Symbol, Expr *> Attrs;
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Attrs attrs;
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list<string> inherited;
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list<Symbol> inherited;
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ExprAttrs() : recursive(false) { };
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COMMON_METHODS
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};
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@ -115,9 +115,9 @@ struct ExprList : Expr
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struct Formal
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{
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string name;
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Symbol name;
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Expr * def;
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Formal(const string & name, Expr * def) : name(name), def(def) { };
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Formal(const Symbol & name, Expr * def) : name(name), def(def) { };
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};
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struct Formals
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@ -130,11 +130,11 @@ struct Formals
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struct ExprLambda : Expr
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{
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Pos pos;
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string arg;
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Symbol arg;
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bool matchAttrs;
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Formals * formals;
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Expr * body;
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ExprLambda(const Pos & pos, const string & arg, bool matchAttrs, Formals * formals, Expr * body)
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ExprLambda(const Pos & pos, const Symbol & arg, bool matchAttrs, Formals * formals, Expr * body)
|
||||
: pos(pos), arg(arg), matchAttrs(matchAttrs), formals(formals), body(body) { };
|
||||
COMMON_METHODS
|
||||
};
|
||||
|
|
|
|||
|
|
@ -9,10 +9,10 @@ namespace nix {
|
|||
|
||||
/* Parse a Nix expression from the specified file. If `path' refers
|
||||
to a directory, then "/default.nix" is appended. */
|
||||
Expr * parseExprFromFile(Path path);
|
||||
Expr * parseExprFromFile(EvalState & state, Path path);
|
||||
|
||||
/* Parse a Nix expression from the specified string. */
|
||||
Expr * parseExprFromString(const string & s, const Path & basePath);
|
||||
Expr * parseExprFromString(EvalState & state, const string & s, const Path & basePath);
|
||||
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -37,17 +37,23 @@ namespace nix {
|
|||
|
||||
struct ParseData
|
||||
{
|
||||
SymbolTable & symbols;
|
||||
Expr * result;
|
||||
Path basePath;
|
||||
Path path;
|
||||
string error;
|
||||
Symbol sLetBody;
|
||||
ParseData(SymbolTable & symbols)
|
||||
: symbols(symbols)
|
||||
, sLetBody(symbols.create("<let-body>"))
|
||||
{ };
|
||||
};
|
||||
|
||||
|
||||
static string showAttrPath(const vector<string> & attrPath)
|
||||
static string showAttrPath(const vector<Symbol> & attrPath)
|
||||
{
|
||||
string s;
|
||||
foreach (vector<string>::const_iterator, i, attrPath) {
|
||||
foreach (vector<Symbol>::const_iterator, i, attrPath) {
|
||||
if (!s.empty()) s += '.';
|
||||
s += *i;
|
||||
}
|
||||
|
|
@ -55,10 +61,11 @@ static string showAttrPath(const vector<string> & attrPath)
|
|||
}
|
||||
|
||||
|
||||
static void addAttr(ExprAttrs * attrs, const vector<string> & attrPath, Expr * e, const Pos & pos)
|
||||
static void addAttr(ExprAttrs * attrs, const vector<Symbol> & attrPath,
|
||||
Expr * e, const Pos & pos)
|
||||
{
|
||||
unsigned int n = 0;
|
||||
foreach (vector<string>::const_iterator, i, attrPath) {
|
||||
foreach (vector<Symbol>::const_iterator, i, attrPath) {
|
||||
n++;
|
||||
if (attrs->attrs[*i]) {
|
||||
ExprAttrs * attrs2 = dynamic_cast<ExprAttrs *>(attrs->attrs[*i]);
|
||||
|
|
@ -243,10 +250,10 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, const char * err
|
|||
nix::Formals * formals;
|
||||
nix::Formal * formal;
|
||||
int n;
|
||||
char * id;
|
||||
char * id; // !!! -> Symbol
|
||||
char * path;
|
||||
char * uri;
|
||||
std::vector<std::string> * ids;
|
||||
std::vector<nix::Symbol> * ids;
|
||||
std::vector<nix::Expr *> * string_parts;
|
||||
}
|
||||
|
||||
|
|
@ -287,19 +294,19 @@ expr: expr_function;
|
|||
|
||||
expr_function
|
||||
: ID ':' expr_function
|
||||
{ $$ = new ExprLambda(CUR_POS, $1, false, 0, $3); /* checkPatternVars(CUR_POS, $1); $$ = makeFunction($1, $3, CUR_POS); */ }
|
||||
{ $$ = new ExprLambda(CUR_POS, data->symbols.create($1), false, 0, $3); /* checkPatternVars(CUR_POS, $1); */ }
|
||||
| '{' formals '}' ':' expr_function
|
||||
{ $$ = new ExprLambda(CUR_POS, "", true, $2, $5); }
|
||||
{ $$ = new ExprLambda(CUR_POS, data->symbols.create(""), true, $2, $5); }
|
||||
| '{' formals '}' '@' ID ':' expr_function
|
||||
{ $$ = new ExprLambda(CUR_POS, $5, true, $2, $7); }
|
||||
{ $$ = new ExprLambda(CUR_POS, data->symbols.create($5), true, $2, $7); }
|
||||
| ID '@' '{' formals '}' ':' expr_function
|
||||
{ $$ = new ExprLambda(CUR_POS, $1, true, $4, $7); }
|
||||
{ $$ = new ExprLambda(CUR_POS, data->symbols.create($1), true, $4, $7); }
|
||||
| ASSERT expr ';' expr_function
|
||||
{ $$ = new ExprAssert(CUR_POS, $2, $4); }
|
||||
| WITH expr ';' expr_function
|
||||
{ $$ = new ExprWith(CUR_POS, $2, $4); }
|
||||
| LET binds IN expr_function
|
||||
{ $2->attrs["<let-body>"] = $4; $2->recursive = true; $$ = new ExprSelect($2, "<let-body>"); }
|
||||
{ $2->attrs[data->sLetBody] = $4; $2->recursive = true; $$ = new ExprSelect($2, data->sLetBody); }
|
||||
| expr_if
|
||||
;
|
||||
|
||||
|
|
@ -316,7 +323,7 @@ expr_op
|
|||
| expr_op OR expr_op { $$ = new ExprOpOr($1, $3); }
|
||||
| expr_op IMPL expr_op { $$ = new ExprOpImpl($1, $3); }
|
||||
| expr_op UPDATE expr_op { $$ = new ExprOpUpdate($1, $3); }
|
||||
| expr_op '?' ID { $$ = new ExprOpHasAttr($1, $3); }
|
||||
| expr_op '?' ID { $$ = new ExprOpHasAttr($1, data->symbols.create($3)); }
|
||||
| expr_op '+' expr_op
|
||||
{ vector<Expr *> * l = new vector<Expr *>;
|
||||
l->push_back($1);
|
||||
|
|
@ -335,12 +342,12 @@ expr_app
|
|||
|
||||
expr_select
|
||||
: expr_select '.' ID
|
||||
{ $$ = new ExprSelect($1, $3); }
|
||||
{ $$ = new ExprSelect($1, data->symbols.create($3)); }
|
||||
| expr_simple { $$ = $1; }
|
||||
;
|
||||
|
||||
expr_simple
|
||||
: ID { $$ = new ExprVar($1); }
|
||||
: ID { $$ = new ExprVar(data->symbols.create($1)); }
|
||||
| INT { $$ = new ExprInt($1); }
|
||||
| '"' string_parts '"' {
|
||||
/* For efficiency, and to simplify parse trees a bit. */
|
||||
|
|
@ -357,7 +364,7 @@ expr_simple
|
|||
/* Let expressions `let {..., body = ...}' are just desugared
|
||||
into `(rec {..., body = ...}).body'. */
|
||||
| LET '{' binds '}'
|
||||
{ $3->recursive = true; $$ = new ExprSelect($3, "body"); }
|
||||
{ $3->recursive = true; $$ = new ExprSelect($3, data->symbols.create("body")); }
|
||||
| REC '{' binds '}'
|
||||
{ $3->recursive = true; $$ = $3; }
|
||||
| '{' binds '}'
|
||||
|
|
@ -381,26 +388,26 @@ binds
|
|||
: binds attrpath '=' expr ';' { $$ = $1; addAttr($$, *$2, $4, CUR_POS); }
|
||||
| binds INHERIT ids ';'
|
||||
{ $$ = $1;
|
||||
foreach (vector<string>::iterator, i, *$3)
|
||||
foreach (vector<Symbol>::iterator, i, *$3)
|
||||
$$->inherited.push_back(*i);
|
||||
}
|
||||
| binds INHERIT '(' expr ')' ids ';'
|
||||
{ $$ = $1;
|
||||
/* !!! Should ensure sharing of the expression in $4. */
|
||||
foreach (vector<string>::iterator, i, *$6)
|
||||
foreach (vector<Symbol>::iterator, i, *$6)
|
||||
$$->attrs[*i] = new ExprSelect($4, *i);
|
||||
}
|
||||
| { $$ = new ExprAttrs; }
|
||||
;
|
||||
|
||||
ids
|
||||
: ids ID { $$ = $1; $1->push_back($2); /* !!! dangerous */ }
|
||||
| { $$ = new vector<string>; }
|
||||
: ids ID { $$ = $1; $1->push_back(data->symbols.create($2)); /* !!! dangerous */ }
|
||||
| { $$ = new vector<Symbol>; }
|
||||
;
|
||||
|
||||
attrpath
|
||||
: attrpath '.' ID { $$ = $1; $1->push_back($3); }
|
||||
| ID { $$ = new vector<string>; $$->push_back($1); }
|
||||
: attrpath '.' ID { $$ = $1; $1->push_back(data->symbols.create($3)); }
|
||||
| ID { $$ = new vector<Symbol>; $$->push_back(data->symbols.create($1)); }
|
||||
;
|
||||
|
||||
expr_list
|
||||
|
|
@ -420,8 +427,8 @@ formals
|
|||
;
|
||||
|
||||
formal
|
||||
: ID { $$ = new Formal($1, 0); }
|
||||
| ID '?' expr { $$ = new Formal($1, $3); }
|
||||
: ID { $$ = new Formal(data->symbols.create($1), 0); }
|
||||
| ID '?' expr { $$ = new Formal(data->symbols.create($1), $3); }
|
||||
;
|
||||
|
||||
%%
|
||||
|
|
@ -432,14 +439,17 @@ formal
|
|||
#include <fcntl.h>
|
||||
#include <unistd.h>
|
||||
|
||||
#include <eval.hh>
|
||||
|
||||
|
||||
namespace nix {
|
||||
|
||||
|
||||
static Expr * parse(const char * text, const Path & path, const Path & basePath)
|
||||
static Expr * parse(EvalState & state, const char * text,
|
||||
const Path & path, const Path & basePath)
|
||||
{
|
||||
yyscan_t scanner;
|
||||
ParseData data;
|
||||
ParseData data(state.symbols);
|
||||
data.basePath = basePath;
|
||||
data.path = path;
|
||||
|
||||
|
|
@ -460,7 +470,7 @@ static Expr * parse(const char * text, const Path & path, const Path & basePath)
|
|||
}
|
||||
|
||||
|
||||
Expr * parseExprFromFile(Path path)
|
||||
Expr * parseExprFromFile(EvalState & state, Path path)
|
||||
{
|
||||
assert(path[0] == '/');
|
||||
|
||||
|
|
@ -481,13 +491,14 @@ Expr * parseExprFromFile(Path path)
|
|||
path = canonPath(path + "/default.nix");
|
||||
|
||||
/* Read and parse the input file. */
|
||||
return parse(readFile(path).c_str(), path, dirOf(path));
|
||||
return parse(state, readFile(path).c_str(), path, dirOf(path));
|
||||
}
|
||||
|
||||
|
||||
Expr * parseExprFromString(const string & s, const Path & basePath)
|
||||
Expr * parseExprFromString(EvalState & state,
|
||||
const string & s, const Path & basePath)
|
||||
{
|
||||
return parse(s.c_str(), "(string)", basePath);
|
||||
return parse(state, s.c_str(), "(string)", basePath);
|
||||
}
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -280,7 +280,7 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v)
|
|||
state.forceAttrs(*args[0]);
|
||||
|
||||
/* Figure out the name first (for stack backtraces). */
|
||||
Bindings::iterator attr = args[0]->attrs->find("name");
|
||||
Bindings::iterator attr = args[0]->attrs->find(state.sName);
|
||||
if (attr == args[0]->attrs->end())
|
||||
throw EvalError("required attribute `name' missing");
|
||||
string drvName;
|
||||
|
|
@ -448,8 +448,8 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v)
|
|||
|
||||
/* !!! assumes a single output */
|
||||
state.mkAttrs(v);
|
||||
mkString((*v.attrs)["outPath"], outPath, singleton<PathSet>(drvPath));
|
||||
mkString((*v.attrs)["drvPath"], drvPath, singleton<PathSet>("=" + drvPath));
|
||||
mkString((*v.attrs)[state.sOutPath], outPath, singleton<PathSet>(drvPath));
|
||||
mkString((*v.attrs)[state.sDrvPath], drvPath, singleton<PathSet>("=" + drvPath));
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -667,7 +667,8 @@ static void prim_getAttr(EvalState & state, Value * * args, Value & v)
|
|||
{
|
||||
string attr = state.forceStringNoCtx(*args[0]);
|
||||
state.forceAttrs(*args[1]);
|
||||
Bindings::iterator i = args[1]->attrs->find(attr);
|
||||
// !!! Should we create a symbol here or just do a lookup?
|
||||
Bindings::iterator i = args[1]->attrs->find(state.symbols.create(attr));
|
||||
if (i == args[1]->attrs->end())
|
||||
throw EvalError(format("attribute `%1%' missing") % attr);
|
||||
state.forceValue(i->second);
|
||||
|
|
@ -680,7 +681,7 @@ static void prim_hasAttr(EvalState & state, Value * * args, Value & v)
|
|||
{
|
||||
string attr = state.forceStringNoCtx(*args[0]);
|
||||
state.forceAttrs(*args[1]);
|
||||
mkBool(v, args[1]->attrs->find(attr) != args[1]->attrs->end());
|
||||
mkBool(v, args[1]->attrs->find(state.symbols.create(attr)) != args[1]->attrs->end());
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -701,7 +702,7 @@ static void prim_removeAttrs(EvalState & state, Value * * args, Value & v)
|
|||
|
||||
for (unsigned int i = 0; i < args[1]->list.length; ++i) {
|
||||
state.forceStringNoCtx(args[1]->list.elems[i]);
|
||||
v.attrs->erase(args[1]->list.elems[i].string.s);
|
||||
v.attrs->erase(state.symbols.create(args[1]->list.elems[i].string.s));
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -720,16 +721,16 @@ static void prim_listToAttrs(EvalState & state, Value * * args, Value & v)
|
|||
Value & v2(args[0]->list.elems[i]);
|
||||
state.forceAttrs(v2);
|
||||
|
||||
Bindings::iterator j = v2.attrs->find("name");
|
||||
Bindings::iterator j = v2.attrs->find(state.sName);
|
||||
if (j == v2.attrs->end())
|
||||
throw TypeError("`name' attribute missing in a call to `listToAttrs'");
|
||||
string name = state.forceStringNoCtx(j->second);
|
||||
|
||||
j = v2.attrs->find("value");
|
||||
j = v2.attrs->find(state.symbols.create("value"));
|
||||
if (j == v2.attrs->end())
|
||||
throw TypeError("`value' attribute missing in a call to `listToAttrs'");
|
||||
|
||||
(*v.attrs)[name] = j->second; // !!! sharing?
|
||||
(*v.attrs)[state.symbols.create(name)] = j->second; // !!! sharing?
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -976,8 +977,8 @@ static void prim_parseDrvName(EvalState & state, Value * * args, Value & v)
|
|||
string name = state.forceStringNoCtx(*args[0]);
|
||||
DrvName parsed(name);
|
||||
state.mkAttrs(v);
|
||||
mkString((*v.attrs)["name"], parsed.name);
|
||||
mkString((*v.attrs)["version"], parsed.version);
|
||||
mkString((*v.attrs)[state.sName], parsed.name);
|
||||
mkString((*v.attrs)[state.symbols.create("version")], parsed.version);
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -998,7 +999,7 @@ void EvalState::createBaseEnv()
|
|||
{
|
||||
baseEnv.up = 0;
|
||||
|
||||
Value & builtins = baseEnv.bindings["builtins"];
|
||||
Value & builtins = baseEnv.bindings[symbols.create("builtins")];
|
||||
builtins.type = tAttrs;
|
||||
builtins.attrs = new Bindings;
|
||||
|
||||
|
|
@ -1023,7 +1024,7 @@ void EvalState::createBaseEnv()
|
|||
/* 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(s, "/"));
|
||||
mkThunk(v, baseEnv, parseExprFromString(*this, s, "/"));
|
||||
addConstant("derivation", v);
|
||||
|
||||
// Miscellaneous
|
||||
|
|
|
|||
75
src/libexpr/symbol-table.hh
Normal file
75
src/libexpr/symbol-table.hh
Normal file
|
|
@ -0,0 +1,75 @@
|
|||
#ifndef __SYMBOL_TABLE_H
|
||||
#define __SYMBOL_TABLE_H
|
||||
|
||||
#include <map>
|
||||
|
||||
#include "types.hh"
|
||||
|
||||
namespace nix {
|
||||
|
||||
/* Symbol table used by the parser and evaluator to represent and look
|
||||
up identifiers and attribute sets efficiently.
|
||||
SymbolTable::create() converts a string into a symbol. Symbols
|
||||
have the property that they can be compared efficiently (using a
|
||||
pointer equality test), because the symbol table stores only one
|
||||
copy of each string. */
|
||||
|
||||
class Symbol
|
||||
{
|
||||
private:
|
||||
const string * s; // pointer into SymbolTable
|
||||
Symbol(const string * s) : s(s) { };
|
||||
friend class SymbolTable;
|
||||
|
||||
public:
|
||||
bool operator == (const Symbol & s2) const
|
||||
{
|
||||
return s == s2.s;
|
||||
}
|
||||
|
||||
bool operator != (const Symbol & s2) const
|
||||
{
|
||||
return s != s2.s;
|
||||
}
|
||||
|
||||
bool operator < (const Symbol & s2) const
|
||||
{
|
||||
return s < s2.s;
|
||||
}
|
||||
|
||||
operator const string & () const
|
||||
{
|
||||
return *s;
|
||||
}
|
||||
|
||||
bool empty() const
|
||||
{
|
||||
return s->empty();
|
||||
}
|
||||
|
||||
friend std::ostream & operator << (std::ostream & str, const Symbol & sym);
|
||||
};
|
||||
|
||||
inline std::ostream & operator << (std::ostream & str, const Symbol & sym)
|
||||
{
|
||||
str << *sym.s;
|
||||
return str;
|
||||
}
|
||||
|
||||
class SymbolTable
|
||||
{
|
||||
private:
|
||||
typedef std::set<string> Symbols;
|
||||
Symbols symbols;
|
||||
|
||||
public:
|
||||
Symbol create(const string & s)
|
||||
{
|
||||
std::pair<Symbols::iterator, bool> res = symbols.insert(s);
|
||||
return Symbol(&*res.first);
|
||||
}
|
||||
};
|
||||
|
||||
}
|
||||
|
||||
#endif /* !__SYMBOL_TABLE_H */
|
||||
|
|
@ -28,7 +28,7 @@ static void showAttrs(EvalState & state, bool strict, Bindings & attrs,
|
|||
names.insert(i->first);
|
||||
foreach (StringSet::iterator, i, names) {
|
||||
XMLOpenElement _(doc, "attr", singletonAttrs("name", *i));
|
||||
printValueAsXML(state, strict, attrs[*i], doc, context, drvsSeen);
|
||||
printValueAsXML(state, strict, attrs[state.symbols.create(*i)], doc, context, drvsSeen);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -67,14 +67,14 @@ static void printValueAsXML(EvalState & state, bool strict, Value & v,
|
|||
if (state.isDerivation(v)) {
|
||||
XMLAttrs xmlAttrs;
|
||||
|
||||
Bindings::iterator a = v.attrs->find("derivation");
|
||||
Bindings::iterator a = v.attrs->find(state.symbols.create("derivation"));
|
||||
|
||||
Path drvPath;
|
||||
a = v.attrs->find("drvPath");
|
||||
a = v.attrs->find(state.sDrvPath);
|
||||
if (a != v.attrs->end() && a->second.type == tString)
|
||||
xmlAttrs["drvPath"] = drvPath = a->second.string.s;
|
||||
|
||||
a = v.attrs->find("outPath");
|
||||
a = v.attrs->find(state.sOutPath);
|
||||
if (a != v.attrs->end() && a->second.type == tString)
|
||||
xmlAttrs["outPath"] = a->second.string.s;
|
||||
|
||||
|
|
|
|||
|
|
@ -28,7 +28,7 @@ static Expr * parseStdin(EvalState & state)
|
|||
startNest(nest, lvlTalkative, format("parsing standard input"));
|
||||
string s, s2;
|
||||
while (getline(std::cin, s2)) s += s2 + "\n";
|
||||
return parseExprFromString(s, absPath("."));
|
||||
return parseExprFromString(state, s, absPath("."));
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -136,7 +136,7 @@ void run(Strings args)
|
|||
|
||||
foreach (Strings::iterator, i, files) {
|
||||
Path path = absPath(*i);
|
||||
Expr * e = parseExprFromFile(path);
|
||||
Expr * e = parseExprFromFile(state, path);
|
||||
processExpr(state, attrPaths, parseOnly, strict, autoArgs,
|
||||
evalOnly, xmlOutput, e);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue