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stage2: peer resolve *[N]T to []T (and vice versa)

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Mitchell Hashimoto 2022-02-25 13:21:07 -08:00
parent bf6540ce50
commit 117ef22d3c
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1 changed files with 50 additions and 0 deletions
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src/Sema.zig
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@ -17085,6 +17085,47 @@ fn resolvePeerTypes(
}
}
// *[N]T to []T (prev is slice)
if (chosen_ty.isSlice() and
candidate_ty.ptrSize() == .One and
candidate_ty.childType().zigTypeTag() == .Array)
{
const chosen_elem_ty = chosen_ty.elemType2();
const candidate_elem_ty = candidate_ty.childType().elemType2();
if ((try sema.coerceInMemoryAllowed(block, candidate_elem_ty, chosen_elem_ty, false, target, src, src)) == .ok) {
convert_to_slice = false; // it already is a slice
// If the pointer is const then we need to const
if (candidate_ty.childType().isConstPtr())
make_the_slice_const = true;
continue;
}
}
// *[N]T to []T (current is slice)
if (chosen_ty_tag == .Pointer and
chosen_ty.ptrSize() == .One and
chosen_ty.childType().zigTypeTag() == .Array and
candidate_ty.isSlice())
{
const chosen_child_ty = chosen_ty.childType();
const chosen_elem_ty = chosen_child_ty.elemType2();
const candidate_elem_ty = candidate_ty.elemType2();
if ((try sema.coerceInMemoryAllowed(block, candidate_elem_ty, chosen_elem_ty, false, target, src, src)) == .ok) {
chosen = candidate;
chosen_i = candidate_i + 1;
convert_to_slice = false; // it already is a slice
// If the prev pointer is const then we need to const
if (chosen_child_ty.isConstPtr())
make_the_slice_const = true;
continue;
}
}
// *[N]T and *[M]T
// verify both are pointers to known lengths
if (chosen_ty_tag == .Pointer and
@ -17222,6 +17263,15 @@ fn resolvePeerTypes(
return Type.ptr(sema.arena, info.data);
}
if (make_the_slice_const) {
// turn []T => []const T
var info = chosen_ty.ptrInfo();
info.data.mutable = false;
std.debug.print("TYPE: {}\n", .{Type.ptr(sema.arena, info.data)});
return Type.ptr(sema.arena, info.data);
}
return chosen_ty;
}