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* Implement blackholing.

This commit is contained in:
Eelco Dolstra 2010-03-25 12:51:14 +00:00
parent ef8bd919fc
commit f450384ded
1 changed files with 9 additions and 8 deletions
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17
src/libexpr/eval-test.cc
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@ -27,7 +27,8 @@ typedef enum {
tAttrs, tAttrs,
tThunk, tThunk,
tLambda, tLambda,
tCopy tCopy,
tBlackhole
} ValueType; } ValueType;
@ -82,11 +83,16 @@ static void eval(Env * env, Expr e, Value & v);
void forceValue(Value & v) void forceValue(Value & v)
{ {
if (v.type == tThunk) eval(v.thunk.env, v.thunk.expr, v); if (v.type == tThunk) {
v.type = tBlackhole;
eval(v.thunk.env, v.thunk.expr, v);
}
else if (v.type == tCopy) { else if (v.type == tCopy) {
forceValue(*v.val); forceValue(*v.val);
v = *v.val; v = *v.val;
} }
else if (v.type == tBlackhole)
throw EvalError("infinite recursion encountered");
} }
@ -240,7 +246,6 @@ static void eval(Env * env, Expr e, Value & v)
v.type = tCopy; v.type = tCopy;
v.val = &j->second; v.val = &j->second;
} }
} }
/* Check that each actual argument is listed as a formal /* Check that each actual argument is listed as a formal
@ -290,12 +295,8 @@ void run(Strings args)
doTest("({x ? 1, y ? x}: y) { x = 2; }"); doTest("({x ? 1, y ? x}: y) { x = 2; }");
doTest("({x, y, ...}: x) { x = 1; y = 2; z = 3; }"); doTest("({x, y, ...}: x) { x = 1; y = 2; z = 3; }");
doTest("({x, y, ...}@args: args.z) { x = 1; y = 2; z = 3; }"); doTest("({x, y, ...}@args: args.z) { x = 1; y = 2; z = 3; }");
//doTest("({x ? y, y ? x}: y) { }");
//Expr e = parseExprFromString(state, "let x = \"a\"; in x + \"b\"", "/");
//Expr e = parseExprFromString(state, "(x: x + \"b\") \"a\"", "/");
//Expr e = parseExprFromString(state, "\"a\" + \"b\"", "/");
//Expr e = parseExprFromString(state, "\"a\" + \"b\"", "/");
printMsg(lvlError, format("alloced %1% values") % nrValues); printMsg(lvlError, format("alloced %1% values") % nrValues);
printMsg(lvlError, format("alloced %1% environments") % nrEnvs); printMsg(lvlError, format("alloced %1% environments") % nrEnvs);
} }