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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
4b679510e7
Add checking that a type only satisfies a constraint if it satisfies all of that constraint's equality and rewrite constraints. Enforce the rule that `=` must be used in impls when specifying associated constant values rather than `==`. Turn off the pre-#2173 single-step equality behavior. This is getting somewhat ahead of the approved design, but it's a one-line change to restore the old behavior. Fix `CARBON_CHECK` to handle top-level `,`s in its argument, such as may happen in template argument lists, as this change introduces such a check.
51 lines
2.0 KiB
C++
51 lines
2.0 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#ifndef CARBON_COMMON_CHECK_H_
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#define CARBON_COMMON_CHECK_H_
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#include "common/check_internal.h"
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namespace Carbon {
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// Raw exiting stream. This should be used when building other forms of exiting
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// macros like those below. It evaluates to a temporary `ExitingStream` object
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// that can be manipulated, streamed into, and then will exit the program.
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#define CARBON_RAW_EXITING_STREAM() \
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Carbon::Internal::ExitingStream::Helper() | Carbon::Internal::ExitingStream()
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// Checks the given condition, and if it's false, prints a stack, streams the
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// error message, then exits. This should be used for unexpected errors, such as
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// a bug in the application.
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//
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// For example:
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// CARBON_CHECK(is_valid) << "Data is not valid!";
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#define CARBON_CHECK(...) \
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(__VA_ARGS__) ? (void)0 \
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: CARBON_RAW_EXITING_STREAM() \
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<< "CHECK failure at " << __FILE__ << ":" << __LINE__ \
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<< ": " #__VA_ARGS__ \
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<< Carbon::Internal::ExitingStream::AddSeparator()
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// DCHECK calls CHECK in debug mode, and does nothing otherwise.
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#ifndef NDEBUG
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#define CARBON_DCHECK(...) CARBON_CHECK(__VA_ARGS__)
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#else
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#define CARBON_DCHECK(...) CARBON_CHECK(true || (__VA_ARGS__))
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#endif
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// This is similar to CHECK, but is unconditional. Writing CARBON_FATAL() is
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// clearer than CARBON_CHECK(false) because it avoids confusion about control
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// flow.
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//
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// For example:
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// CARBON_FATAL() << "Unreachable!";
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#define CARBON_FATAL() \
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CARBON_RAW_EXITING_STREAM() \
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<< "FATAL failure at " << __FILE__ << ":" << __LINE__ << ": "
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} // namespace Carbon
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#endif // CARBON_COMMON_CHECK_H_
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