69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
/*
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* context.h
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*
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* Created on: Jan 28, 2020
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* Author: nnosov
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*/
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#ifndef __PST_CONTEXT_H__
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#define __PST_CONTEXT_H__
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#include <string.h>
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#include <stdlib.h>
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#include <execinfo.h>
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#include <libunwind.h>
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#include <elfutils/libdwfl.h>
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#include <stdbool.h>
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#include "utils/allocator.h"
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#include "utils/log.h"
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// uncomment line below to enable debug output to stdout
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//#define PST_DEBUG
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extern pst_logger logger; // logger for whole PST library
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extern pst_allocator allocator; // custom allocator for PST library
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#define pst_alloc(TYPE) (TYPE*)allocator.alloc(&allocator, sizeof(TYPE))
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#define pst_free(NAME) allocator.free(&allocator, NAME)
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#ifdef PST_DEBUG
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#define pst_log(SEVERITY, FORMAT, ...) logger.log(&logger, SEVERITY, FORMAT, ##__VA_ARGS__)
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#else
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#define pst_log(SEVERITY, FORMAT, ...)
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#endif
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char* pst_strdup(const char* str);
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typedef struct __pst_context {
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// methods
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void (*clean_print) (struct __pst_context* ctx);
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bool (*print) (struct __pst_context* ctx, const char* fmt, ...);
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bool (*print_expr) (struct __pst_context* ctx, Dwarf_Op *exprs, int exprlen, Dwarf_Attribute* attr);
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void (*print_registers) (struct __pst_context* ctx, int from, int to);
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void (*print_stack) (struct __pst_context* ctx, int max, uint64_t next_cfa);
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// fields
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ucontext_t* hcontext; // context of signal handler
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unw_context_t context; // context of stack trace
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unw_cursor_t cursor; // libunwind stack frame storage
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unw_cursor_t* curr_frame; // callee libunwind frame
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Dwarf_Addr base_addr; // base address where process loaded
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Dwarf_Addr sp; // stack pointer of currently processed stack frame
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Dwarf_Addr cfa; // CFA (Canonical Frame Address) of currently processed stack frame
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Dwarf_Frame* frame; // currently examined libdwfl frame
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Dwfl* dwfl; // DWARF context
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Dwfl_Module* module; // currently processed CU
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// print buffer
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char buff[8192]; // stack trace buffer
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uint32_t offset; // offset in the 'buff'
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} pst_context;
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void pst_context_init(pst_context* ctx, ucontext_t* hctx);
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void pst_context_fini(pst_context* ctx);
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#endif /* __PST_CONTEXT_H__ */
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