extract context from handler and move it to common. define functions to

use in calculation of DWARF expressions

framework/dwarf_operations.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <elfutils/libdwfl.h>
+
+#include "common.h"
+
+typedef struct __dwarf_op_map dwarf_op_map;
+
+typedef bool (*dwarf_operation)(pst_context* ctx, const dwarf_op_map* map, Dwarf_Word op1, Dwarf_Word op2);
+
+typedef struct __dwarf_op_map {
+	int				op_num;		// DWARF Operation DW_OP_XXX
+	int				regno;		// platform-dependent register number if present
+	const char*		regname;	// register name if 'regno' specified
+	const char* 	op_name;	// string representation of an operation
+	dwarf_operation operation;	// function which handles operation
+} dwarf_op_map;
+
+const dwarf_op_map* find_op_map(int op);