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

to pst_context, move get_frame() from pst_handler to pst_function

framework/registers.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <stdint.h>
+
+
+typedef struct __dwarf_reg_map {
+    int             regno;      // platform-dependent register number
+    const char*     regname;    // register name
+    uint32_t        op_num;     // number of DWARF DW_OP_reg(x)/DW_OP_breg(x) operation corresponds to this register
+} dwarf_reg_map;
+
+int find_regnum(uint32_t op);
+
+typedef enum {
+    REG_OK = 0,
+    REG_UNDEFINED,
+    REG_SAME,
+    REG_CFI_ERROR,
+    REG_EXPR_ERROR
+} pst_reg_error;
+
+typedef struct __pst_frame : public SC_ListNode {
+    __pst_frame() {
+        memset(reg_state, REG_UNDEFINED, sizeof(reg_state));
+        memset(regs, 0, sizeof(regs));
+        cfa = 0;
+    }
+    int32_t     reg_state[128];
+    uint64_t    regs[128];
+    uint64_t    cfa;
+} pst_frame;
+
+pst_reg_error pst_get_reg(pst_context* ctx, int regno, uint64_t& regval);