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Implement support for C++ Substitution Failure Is Not An Error
(SFINAE), which says that errors that occur during template argument
deduction do *not* produce diagnostics and do not necessarily make a
program ill-formed. Instead, template argument deduction silently
fails. This is currently implemented for template argument deduction
during matching of class template partial specializations, although
the mechanism will also apply to template argument deduction for
function templates. The scheme is simple:
- If we are in a template argument deduction context, any diagnostic
that is considered a SFINAE error (or warning) will be
suppressed. The error will be propagated up the call stack via the
normal means.
- By default, all warnings and errors are SFINAE errors. Add the
NoSFINAE class to a diagnostic in the .td file to make it a hard
error (e.g., for access-control violations).
Note that, to make this fully work, every place in Sema that emits an
error *and then immediately recovers* will need to check
Sema::isSFINAEContext() to determine whether it must immediately
return an error rather than recovering.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@73332 91177308-0d34-0410-b5e6-96231b3b80d8
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preprocessor and initialize it early in clang-cc. This
ensures that __has_builtin works in all modes, not just
when ASTContext is around.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@73319 91177308-0d34-0410-b5e6-96231b3b80d8
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fixes a layering violation in lib/Basic/Targets.cpp.
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diagnostics in some cases.
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warnings when building with VC++, patch by AlisdairM!
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TemplateArgumentListBuilder. No functionality change.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@73297 91177308-0d34-0410-b5e6-96231b3b80d8
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builtin preprocessor macro. This appears to work with two caveats:
1) builtins are registered in -E mode, and 2) target-specific builtins
are unconditionally registered even if they aren't supported by the
target (e.g. SSE4 builtin when only SSE1 is enabled).
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specialization cannot be deduced, produce a warning noting that the
affected class template partial specialization will never be used.
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parameter packs.
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This fixes a source range problem reported by Olaf Krzikalla.
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specialization's arguments are identical to the implicit template
arguments of the primary template. Typically, this is meant to be a
declaration/definition of the primary template, so we give that
advice.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@73259 91177308-0d34-0410-b5e6-96231b3b80d8
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template partial specializations.
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specialization do not have default arguments
(C++ [temp.class.spec]p10).
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argument deduction failed. For example, given
template<typename T> struct is_same<T, T> { ... };
template argument deduction will fail for is_same<int, float>, and now
reports enough information
Right now, we don't do anything with this extra information, but it
can be used for informative diagnostics that say, e.g., "template
argument deduction failed because T was deduced to 'int' in one
context and 'float' in another".
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@73237 91177308-0d34-0410-b5e6-96231b3b80d8
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argument before the function has been declared.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@73234 91177308-0d34-0410-b5e6-96231b3b80d8
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Also, introduced some of the framework for performing instantiation as
part of template argument deduction.
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T::*) and implement template instantiation for member pointer types.
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at the moment because we ignore the result.
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of these are not implemented yet.
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and @protocol expressions.
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get rid of a few more clang vector builtins.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@73015 91177308-0d34-0410-b5e6-96231b3b80d8
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argument is not unparsed. Add a new hasDefaultArg() and use it in places where getDefaultArg() was called when the argument was unparsed.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72984 91177308-0d34-0410-b5e6-96231b3b80d8
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change. More to follow.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72951 91177308-0d34-0410-b5e6-96231b3b80d8
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default arguments that have temporaries.
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we're still missing a mechanism to disable these in strict mode, but
that's not a new issue.
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going to need it later). Move push_back to the .cpp file. If the passed in template argument is a type, assert that it's canonical.
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