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Never update values after setting the type

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Thunks are now overwritten by a helper function
`Value::finishValue(newType, payload)` (where `payload` is the
original anonymous union inside `Value`). This helps to ensure we
never update a value elsewhere, since that would be incompatible with
parallel evaluation (i.e. after a value has transitioned from being a
thunk to being a non-thunk, it should be immutable).

There were two places where this happened: `Value::mkString()` and
`ExprAttrs::eval()`.

This PR also adds a bunch of accessor functions for value contents,
like `Value::integer()` to access the integer field in the union.
This commit is contained in:
Eelco Dolstra 2024-03-25 18:20:18 +01:00
parent 6d90287f5a
commit 8c0590fa32
35 changed files with 530 additions and 556 deletions
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12
tests/unit/libexpr/trivial.cc
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@ -62,11 +62,11 @@ namespace nix {
TEST_F(TrivialExpressionTest, updateAttrs) {
auto v = eval("{ a = 1; } // { b = 2; a = 3; }");
ASSERT_THAT(v, IsAttrsOfSize(2));
auto a = v.attrs->find(createSymbol("a"));
auto a = v.attrs()->find(createSymbol("a"));
ASSERT_NE(a, nullptr);
ASSERT_THAT(*a->value, IsIntEq(3));
auto b = v.attrs->find(createSymbol("b"));
auto b = v.attrs()->find(createSymbol("b"));
ASSERT_NE(b, nullptr);
ASSERT_THAT(*b->value, IsIntEq(2));
}
@ -151,7 +151,7 @@ namespace nix {
auto v = eval(expr);
ASSERT_THAT(v, IsAttrsOfSize(1));
auto a = v.attrs->find(createSymbol("a"));
auto a = v.attrs()->find(createSymbol("a"));
ASSERT_NE(a, nullptr);
ASSERT_THAT(*a->value, IsThunk());
@ -159,11 +159,11 @@ namespace nix {
ASSERT_THAT(*a->value, IsAttrsOfSize(2));
auto b = a->value->attrs->find(createSymbol("b"));
auto b = a->value->attrs()->find(createSymbol("b"));
ASSERT_NE(b, nullptr);
ASSERT_THAT(*b->value, IsIntEq(1));
auto c = a->value->attrs->find(createSymbol("c"));
auto c = a->value->attrs()->find(createSymbol("c"));
ASSERT_NE(c, nullptr);
ASSERT_THAT(*c->value, IsIntEq(2));
}
@ -185,7 +185,7 @@ namespace nix {
TEST_F(TrivialExpressionTest, bindOr) {
auto v = eval("{ or = 1; }");
ASSERT_THAT(v, IsAttrsOfSize(1));
auto b = v.attrs->find(createSymbol("or"));
auto b = v.attrs()->find(createSymbol("or"));
ASSERT_NE(b, nullptr);
ASSERT_THAT(*b->value, IsIntEq(1));
}