97 lines
2.1 KiB
C++
97 lines
2.1 KiB
C++
|
#include "../stack_walker/stack_walker.hpp"
|
||
|
|
|
||
|
|
#include <libunwind.h>
|
||
|
|
#include <vector>
|
||
|
|
#include <cassert>
|
||
|
|
|
||
|
|
struct UnwPtrs {
|
||
|
|
unw_context_t* ctx;
|
||
|
|
unw_cursor_t* cursor;
|
||
|
|
};
|
||
|
|
|
||
|
|
static std::vector<UnwPtrs> to_delete;
|
||
|
|
|
||
|
|
|
||
|
|
bool stack_walker_init() {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
void stack_walker_close() {
|
||
|
|
for(auto& del: to_delete) {
|
||
|
|
delete del.ctx;
|
||
|
|
delete del.cursor;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static unw_cursor_t* get_cursor(const unwind_context_t& context) {
|
||
|
|
// This is subtly dirty.
|
||
|
|
// unwind_context_t::rip is uint64_t, thus suitable for a pointer.
|
||
|
|
return (unw_cursor_t*) context.rip;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void set_cursor(unwind_context_t& context, unw_cursor_t* unw_cursor) {
|
||
|
|
// This is subtly dirty.
|
||
|
|
// unwind_context_t::rip is uint64_t, thus suitable for a pointer.
|
||
|
|
context.rip = (uintptr_t) unw_cursor;
|
||
|
|
}
|
||
|
|
|
||
|
|
unwind_context_t get_context() {
|
||
|
|
int rc;
|
||
|
|
unw_context_t* unw_context = new unw_context_t;
|
||
|
|
rc = unw_getcontext(unw_context);
|
||
|
|
if(rc < 0)
|
||
|
|
assert(0);
|
||
|
|
|
||
|
|
unw_cursor_t* cursor = new unw_cursor_t;
|
||
|
|
rc = unw_init_local(cursor, unw_context);
|
||
|
|
if(rc < 0)
|
||
|
|
assert(0);
|
||
|
|
|
||
|
|
rc = unw_step(cursor);
|
||
|
|
if(rc < 0)
|
||
|
|
assert(0);
|
||
|
|
|
||
|
|
unwind_context_t out;
|
||
|
|
|
||
|
|
set_cursor(out, cursor);
|
||
|
|
|
||
|
|
to_delete.push_back(UnwPtrs({unw_context, cursor}));
|
||
|
|
|
||
|
|
return out;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool unwind_context(unwind_context_t& ctx) {
|
||
|
|
int rc = unw_step(get_cursor(ctx));
|
||
|
|
return rc > 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void walk_stack(const std::function<void(const unwind_context_t&)>& mapped) {
|
||
|
|
unwind_context_t context = get_context();
|
||
|
|
do {
|
||
|
|
mapped(context);
|
||
|
|
} while(unwind_context(context));
|
||
|
|
}
|
||
|
|
|
||
|
|
uintptr_t get_register(const unwind_context_t& ctx, StackWalkerRegisters reg) {
|
||
|
|
unw_cursor_t* cursor = get_cursor(ctx);
|
||
|
|
unw_regnum_t regnum = 0;
|
||
|
|
|
||
|
|
switch(reg) {
|
||
|
|
case SW_REG_RIP:
|
||
|
|
regnum = UNW_X86_64_RIP;
|
||
|
|
break;
|
||
|
|
case SW_REG_RSP:
|
||
|
|
regnum = UNW_X86_64_RSP;
|
||
|
|
break;
|
||
|
|
case SW_REG_RBP:
|
||
|
|
regnum = UNW_X86_64_RBP;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
uintptr_t out;
|
||
|
|
int rc = unw_get_reg(cursor, regnum, &out);
|
||
|
|
if(rc < 0)
|
||
|
|
assert(false);
|
||
|
|
return out;
|
||
|
|
}
|