[clang] [Clang][Sema] Print more static_assert exprs (PR #74852)
Erich Keane via cfe-commits
cfe-commits at lists.llvm.org
Tue Jan 16 08:02:03 PST 2024
================
@@ -0,0 +1,115 @@
+// RUN: %clang_cc1 -std=c++2a -verify %s
+
+struct A {
+ int a, b[3], c;
+ bool operator==(const A&) const = default;
+};
+
+constexpr auto a0 = A{0, 0, 3, 4, 5};
+
+// expected-note at +1 {{evaluates to 'A{0, {0, 3, 4}, 5} == A{1, {2, 3, 4}, 5}'}}
+static_assert(a0 == A{1, {2, 3, 4}, 5}); // expected-error {{failed}}
+
+struct _arr {
+ const int b[3];
+ constexpr bool operator==(const int rhs[3]) const {
+ for (unsigned i = 0; i < sizeof(b) / sizeof(int); i++)
+ if (b[i] != rhs[i])
+ return false;
+ return true;
+ }
+};
+
+// expected-note at +1 {{{evaluates to '_arr{{2, 3, 4}} == (int[3]){0, 3, 4}'}}}
+static_assert(_arr{2, 3, 4} == a0.b); // expected-error {{failed}}
+
+struct B {
+ int a, c; // named the same just to keep things fresh
+ bool operator==(const B&) const = default;
+};
+
+// expected-note at +1 {{evaluates to 'B{7, 6} == B{8, 6}'}}
+static_assert(B{7, 6} == B{8, 6}); // expected-error {{failed}}
+
+typedef int v4si __attribute__((__vector_size__(16)));
+
+struct C: A, B {
+ enum { E1, E2 } e;
+ bool operator==(const C&) const = default;
+};
+
+constexpr auto cc = C{A{1, {2, 3, 4}, 5}, B{7, 6}, C::E1};
+
+// expected-note at +1 {{{evaluates to 'C{{1, {2, 3, 4}, 5}, {7, 6}, 0} == C{{0, {0, 3, 4}, 5}, {5, 0}, 1}'}}}
+static_assert(cc == C{a0, {5}, C::E2}); // expected-error {{failed}}
----------------
erichkeane wrote:
I think that would be a sensible improvement here. I think mixed with making sure we don't print arbitrarily sized structs/arrays would make this 'net improvement'.
https://github.com/llvm/llvm-project/pull/74852
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