move register-related code to separate files, move DWARF module & handle

to pst_context, move get_frame() from pst_handler to pst_function

framework/common.h

@@ -8,16 +8,20 @@
 #include "logger/log.h"
 #include "linkedlist.h"
 
+#define USE_LIBUNWIND
+
 typedef struct __pst_context {
 	__pst_context(ucontext_t* hctx) : hcontext(hctx)
 	{
-		offset = 0;
-		buff[0] = 0;
+	    clean_print();
 		base_addr = 0;
 		sp = 0;
 		cfa = 0;
 		curr_frame = NULL;
 		next_frame = NULL;
+		frame = NULL;
+		dwfl = NULL;
+		module = NULL;
 	}
 
 	bool print(const char* fmt, ...);
@@ -25,18 +29,31 @@ typedef struct __pst_context {
 	uint32_t print_expr_block(Dwarf_Op *exprs, int len, char* buff, uint32_t buff_size, Dwarf_Attribute* attr = 0);
 	void print_registers(int from, int to);
 	void print_stack(int max, uint64_t next_cfa);
+	void clean_print() {
+	    buff[0] = 0;
+	    offset = 0;
+	}
+
+	const char* get_print() {
+	    return buff;
+	}
 
 	ucontext_t*					hcontext;	// context of signal handler
 	unw_context_t				context;	// context of stack trace
 	unw_cursor_t                cursor;
-	unw_cursor_t*				curr_frame;	// currently examined frame of context
-	unw_cursor_t*               next_frame; // caller frame
+	unw_cursor_t*				curr_frame;	// callee libunwind frame
+	unw_cursor_t*               next_frame; // caller libunwind frame
 	Dwarf_Addr					base_addr;	// base address where process loaded
 
-	char						buff[8192]; // stack trace buffer
-	uint32_t					offset;		// offset in the 'buff'
     Dwarf_Addr                  sp;
     Dwarf_Addr                  cfa;
+    Dwarf_Frame*                frame;      // currently examined libdwfl frame
+    Dwfl*                       dwfl;       // DWARF context
+    Dwfl_Module*                module;     // currently processed CU
+
+protected:
+	char						buff[8192]; // stack trace buffer
+	uint32_t					offset;		// offset in the 'buff'
 } pst_context;