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Specialize std::hash for gdb_exception

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This adds a std::hash specialization for gdb_exception.  This lets us
store these objects in a hash table, which is used later in this
series to de-duplicate the exception output from multiple threads.
This commit is contained in:
Tom Tromey
2021-09-06 15:22:44 -06:00
parent f4565e4c99
commit 85098eeb4c
1 changed files with 19 additions and 0 deletions
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19
gdbsupport/common-exceptions.h
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@ -24,6 +24,7 @@
#include <new> #include <new>
#include <memory> #include <memory>
#include <string> #include <string>
#include <functional>
/* Reasons for calling throw_exceptions(). NOTE: all reason values /* Reasons for calling throw_exceptions(). NOTE: all reason values
must be different from zero. enum value 0 is reserved for internal must be different from zero. enum value 0 is reserved for internal
@ -187,6 +188,24 @@ struct gdb_exception
std::shared_ptr<std::string> message; std::shared_ptr<std::string> message;
}; };
namespace std
{
/* Specialization of std::hash for gdb_exception. */
template<>
struct hash<gdb_exception>
{
size_t operator() (const gdb_exception &exc) const
{
size_t result = exc.reason + exc.error;
if (exc.message != nullptr)
result += std::hash<std::string> {} (*exc.message);
return result;
}
};
}
/* Functions to drive the sjlj-based exceptions state machine. Though /* Functions to drive the sjlj-based exceptions state machine. Though
declared here by necessity, these functions should be considered declared here by necessity, these functions should be considered
internal to the exceptions subsystem and not used other than via internal to the exceptions subsystem and not used other than via