diff options
Diffstat (limited to 'lib/Bytecode/Reader/Reader.h')
| -rw-r--r-- | lib/Bytecode/Reader/Reader.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/lib/Bytecode/Reader/Reader.h b/lib/Bytecode/Reader/Reader.h index 86ccc200a7..cba7154dbe 100644 --- a/lib/Bytecode/Reader/Reader.h +++ b/lib/Bytecode/Reader/Reader.h @@ -226,6 +226,18 @@ protected: Function* F ///< The function into which BBs will be inserted ); + /// Convert previous opcode values into the current value and/or construct + /// the instruction. This function handles all *abnormal* cases for + /// instruction generation based on obsolete opcode values. The normal cases + /// are handled by the ParseInstruction function. + Instruction* handleObsoleteOpcodes( + unsigned &opcode, ///< The old opcode, possibly updated by this function + std::vector<unsigned> &Oprnds, ///< The operands to the instruction + unsigned &iType, ///< The type code from the bytecode file + const Type* InstTy, ///< The type of the instruction + BasicBlock* BB ///< The basic block to insert into, if we need to + ); + /// @brief Parse a single instruction. void ParseInstruction( std::vector<unsigned>& Args, ///< The arguments to be filled in @@ -336,6 +348,13 @@ private: // unreachable instruction. bool hasNoUnreachableInst; + // In version 5 and prior, instructions were signless. In version 6, + // instructions became signed. For example in version 5 we have the DIV + // instruction but in version 6 we have FDIV, SDIV and UDIV to replace it. + // This causes a renumbering of the instruction codes in version 6 that must + // be dealt with when reading old bytecode files. + bool hasSignlessInstructions; + /// In release 1.7 we changed intrinsic functions to not be overloaded. There /// is no bytecode change for this, but to optimize the auto-upgrade of calls /// to intrinsic functions, we save a mapping of old function definitions to |