add lz4 compression to pctrace

incl/iss/arch/tgc_c.h

@@ -252,13 +252,13 @@ struct tgc_c: public arch_if {
         uint8_t PRIV = 0; 
         uint32_t DPC = 0;
     } reg;
+#pragma pack(pop)
     uint32_t trap_state = 0, pending_trap = 0;
     uint64_t icount = 0;
     uint64_t cycle = 0;
     uint64_t instret = 0;
     uint32_t instruction = 0;
     uint32_t last_branch = 0;
-#pragma pack(pop)
     std::array<address_type, 4> addr_mode;
     
     uint64_t interrupt_sim=0;

incl/iss/plugin/pctrace.h

@@ -44,7 +44,7 @@
 
 namespace iss {
 namespace plugin {
-
+class lz4compress_steambuf;
 class cov : public iss::vm_plugin {
     struct instr_delay {
         std::string instr_name;
@@ -88,10 +88,13 @@ public:
 private:
     iss::instrumentation_if *instr_if  {nullptr};
     std::ofstream output;
+#ifdef WITH_LZ4
+    std::unique_ptr<lz4compress_steambuf> strbuf;
+    std::ostream ostr;
+#endif
     std::string filename;
     std::vector<instr_desc> delays;
-    bool jumped, first;
-
+    bool jumped{false}, first{true};
 };
 }
 }