+
+ /// Decoded instruction cache type, for address decoding.
+ /// A generic hash_map is used.
+ typedef m5::hash_map<Addr, AddrDecodePage *> AddrDecodeCache;
+
+ /// A cache of decoded instruction objects from addresses.
+ static AddrDecodeCache addrDecodeCache;
+
+ struct cacheElement
+ {
+ Addr page_addr;
+ AddrDecodePage *decodePage;
+
+ cacheElement() : decodePage(NULL) { }
+ };
+
+ /// An array of recently decoded instructions.
+ // might not use an array if there is only two elements
+ static struct cacheElement recentDecodes[2];
+
+ /// Updates the recently decoded instructions entries
+ /// @param page_addr The page address recently used.
+ /// @param decodePage Pointer to decoding page containing the decoded
+ /// instruction.
+ static inline void
+ updateCache(Addr page_addr, AddrDecodePage *decodePage)
+ {
+ recentDecodes[1].page_addr = recentDecodes[0].page_addr;
+ recentDecodes[1].decodePage = recentDecodes[0].decodePage;
+ recentDecodes[0].page_addr = page_addr;
+ recentDecodes[0].decodePage = decodePage;
+ }
+
+ /// Searches the decoded instruction cache for instruction decoding.
+ /// If it is not found, then we decode the instruction.
+ /// Otherwise, we get the instruction from the cache and move it into
+ /// the address-to-instruction decoding page.
+ /// @param mach_inst The binary instruction to decode.
+ /// @param addr The address that contained the binary instruction.
+ /// @param decodePage Pointer to decoding page containing the instruction.
+ /// @retval A pointer to the corresponding StaticInst object.
+ //This is defined as inlined below.
+ static StaticInstPtr searchCache(ExtMachInst mach_inst, Addr addr,
+ AddrDecodePage *decodePage);