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Add an LLVM_BUILTIN_DEBUGTRAP macro.

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Summary:
This provides a macro that expands to __builtin_debugtrap() for clang,
and __debugbreak() for MSVC.

It intentionally expands to nothing for compilers that do not support a
similar mechanism that halts the debugger without otherwise crashing the
process.

Differential Revision: http://reviews.llvm.org/D18002

llvm-svn: 263095
This commit is contained in:
Mark Lacey 2016-03-10 05:15:03 +00:00
parent 26a5894f0f
commit 6bac742f98
1 changed files with 17 additions and 0 deletions
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17
include/llvm/Support/Compiler.h
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@ -274,6 +274,23 @@
# define LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0
#endif
/// LLVM_BUILTIN_DEBUGTRAP - On compilers which support it, expands to
/// an expression which causes the program to break while running
/// under a debugger.
#if __has_builtin(__builtin_debugtrap)
# define LLVM_BUILTIN_DEBUGTRAP __builtin_debugtrap()
#elif defined(_MSC_VER)
// The __debugbreak intrinsic is supported by MSVC and breaks while
// running under the debugger, and also supports invoking a debugger
// when the OS is configured appropriately.
# define LLVM_BUILTIN_DEBUGTRAP __debugbreak()
#else
// Just continue execution when built with compilers that have no
// support. This is a debugging aid and not intended to force the
// program to abort if encountered.
# define LLVM_BUILTIN_DEBUGTRAP
#endif
/// \macro LLVM_ASSUME_ALIGNED
/// \brief Returns a pointer with an assumed alignment.
#if __has_builtin(__builtin_assume_aligned) || LLVM_GNUC_PREREQ(4, 7, 0)