code hierarchy refactoring

2020-02-05 09:41:22 +04:00
parent c21c623be4
commit 3c7105eb97
35 changed files with 145 additions and 113 deletions
@@ -0,0 +1,60 @@
+/*
+ * context.h
+ *
+ *  Created on: Jan 28, 2020
+ *      Author: nnosov
+ */
+
+#ifndef FRAMEWORK_CONTEXT_H_
+#define FRAMEWORK_CONTEXT_H_
+
+#include <string.h>
+#include <stdlib.h>
+#include <execinfo.h>
+#include <libunwind.h>
+#include <elfutils/libdwfl.h>
+
+#include "../src/utils/allocator.h"
+#include "../src/utils/log.h"
+
+extern pst_log          logger;     // logger for whole PST library
+extern pst_allocator    allocator;  // custom allocator for PST library
+
+#define pst_alloc(TYPE) (TYPE*)allocator.alloc(&allocator, sizeof(TYPE))
+#define pst_free(NAME) allocator.free(&allocator, NAME)
+
+#define pst_log(SEVERITY, FORMAT, ...) logger.log(&logger, SEVERITY, FORMAT, ##__VA_ARGS__)
+
+char* pst_strdup(const char* str);
+
+typedef struct pst_context {
+    // methods
+    void (*clean_print)     (pst_context* ctx);
+    bool (*print)           (pst_context* ctx, const char* fmt, ...);
+    bool (*print_expr)      (pst_context* ctx, Dwarf_Op *exprs, int exprlen, Dwarf_Attribute* attr);
+    void (*print_registers) (pst_context* ctx, int from, int to);
+    void (*print_stack)     (pst_context* ctx, int max, uint64_t next_cfa);
+
+    // fields
+    ucontext_t*                 hcontext;   // context of signal handler
+    unw_context_t               context;    // context of stack trace
+    unw_cursor_t                cursor;     // libunwind stack frame storage
+    unw_cursor_t*               curr_frame; // callee libunwind frame
+    Dwarf_Addr                  base_addr;  // base address where process loaded
+
+    Dwarf_Addr                  sp;         // stack pointer of currently processed stack frame
+    Dwarf_Addr                  cfa;        // CFA (Canonical Frame Address) of currently processed stack frame
+
+    Dwarf_Frame*                frame;      // currently examined libdwfl frame
+    Dwfl*                       dwfl;       // DWARF context
+    Dwfl_Module*                module;     // currently processed CU
+
+    // print buffer
+    char                        buff[8192]; // stack trace buffer
+    uint32_t                    offset;     // offset in the 'buff'
+} pst_context;
+
+void pst_context_init(pst_context* ctx, ucontext_t* hctx);
+void pst_context_fini(pst_context* ctx);
+
+#endif /* FRAMEWORK_CONTEXT_H_ */