| Summary: | cxxabi.h does not match the C++ ABI | ||
|---|---|---|---|
| Product: | gcc | Reporter: | grigory |
| Component: | libstdc++ | Assignee: | Benjamin Kosnik <bkoz> |
| Status: | RESOLVED FIXED | ||
| Severity: | normal | CC: | gcc-bugs, jakub |
| Priority: | P3 | ||
| Version: | 3.1.1 | ||
| Target Milestone: | --- | ||
| Host: | i686-pc-linux-gnu | Target: | i686-pc-linux-gnu |
| Build: | i686-pc-linux-gnu | Known to work: | |
| Known to fail: | Last reconfirmed: | ||
There is a couple of discrepancies between G++ implementation of 'cxxabi.h' file and the C++ ABI. I. Member name difference ------------------------- The C++ ABI defines that... 2.9.5 RTTI Layout 9 The abi::__pointer_to_member_type_info type adds one field to abi::__pbase_type_info: class __pointer_to_member_type_info : public __pbase_type_info { public: const abi::__class_type_info *__context; }; G++ implementation is the following: --- cxxabi.h ------------------------------------------------------------ class __pointer_to_member_type_info : public __pbase_type_info { /* abi defined member variables */ public: __class_type_info *__context_class; /* class of the member */ ------------------------------------------------------------------------- II. Class name difference ------------------------- Class '__base_class_type_info' specifyed by the C++ ABI, declared with the name '__base_class_info' in the G++'s cxxabi.h file. Moreover, name of the member __base_type is different too. 2.9.5 RTTI Layout 6. Three different types are used to represent user type information: __base_info[] is an array of base class descriptions -- one for every direct proper base. Each description is of the type: struct abi::__base_class_type_info { public: const __class_type_info *__base_type; long __offset_flags; enum __offset_flags_masks { __virtual_mask = 0x1, __public_mask = 0x2, __offset_shift = 8 }; }; --- G++'s cxxabi.h ------------------------------------------------------ class __base_class_info { /* abi defined member variables */ public: const __class_type_info *__base; /* base class type */ long __offset_flags; /* offset and info */ ------------------------------------------------------------------------- Release: 3.1.1 Environment: host: i686-pc-linux-gnu build: i686-pc-linux-gnu target: i686-pc-linux-gnu configured with: ./configure --enable-threads