4aaf1dca08
Summary: rC337815 / D49508 had to cannibalize one bit of `CastExprBitfields::BasePathSize` in order to squeeze `PartOfExplicitCast` boolean. That reduced the maximal value of `PartOfExplicitCast` from 9 bits (~512) down to 8 bits (~256). Apparently, that mattered. Too bad there weren't any tests. It caused [[ https://bugs.llvm.org/show_bug.cgi?id=38356 | PR38356 ]]. So we need to increase `PartOfExplicitCast` back at least to 9 bits, or a bit more. For obvious reasons, we can't do that in `CastExprBitfields` - that would blow up the size of every `Expr`. So we need to either just add a variable into the `CastExpr` (as done here), or use `llvm::TrailingObjects`. The latter does not seem to be straight-forward. Perhaps, that needs to be done not for the `CastExpr` itself, but for all of it's `final` children. Reviewers: rjmccall, rsmith, erichkeane Reviewed By: rjmccall Subscribers: bricci, hans, cfe-commits, waddlesplash Differential Revision: https://reviews.llvm.org/D50050 llvm-svn: 338489
28 lines
766 B
C++
28 lines
766 B
C++
// RUN: %clang_cc1 %s -emit-llvm -o -
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// https://bugs.llvm.org/show_bug.cgi?id=38356
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// We only check that we do not crash.
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template <typename a, a b(unsigned), int c, unsigned...>
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struct d : d<a, b, c - 1> {};
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template <typename a, a b(unsigned), unsigned... e>
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struct d<a, b, 0, e...> {
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a f[0];
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};
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struct g {
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static g h(unsigned);
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};
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struct i {
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void j() const;
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// Current maximum depth of recursive template instantiation is 1024,
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// thus, this \/ threshold value is used here. BasePathSize in CastExpr might
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// not fit it, so we are testing that we do fit it.
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// If -ftemplate-depth= is provided, larger values (4096 and up) cause crashes
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// elsewhere.
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d<g, g::h, (1U << 10U) - 2U> f;
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};
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void i::j() const {
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const void *k{f.f};
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(void)k;
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}
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