nixos/nix
1
1
Fork 0
mirror of https://github.com/NixOS/nix.git synced 2025-11-12 05:26:02 +01:00
Code Activity

* Use a symbol table to represent identifiers and attribute names

Browse source 
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 2010-04-13 12:25:42 +00:00
parent 10e8b1fd15
commit ac1e8f40d4
15 changed files with 228 additions and 101 deletions
Download patch file Download diff file Expand all files Collapse all files

27
src/libexpr/primops.cc
View file

@ -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