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use two stage unwinding: 1st is simply detection of function name using

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libunwind and save functions cursor. 2nd - use dwarf information to cath
as more info as possible. this approach also allows to dereference
DW_OP_GNU_value operation since it need access to caller frame from
callee context
This commit is contained in:
nnosov
2020-01-16 14:54:42 +04:00
parent f044133d8a
commit 1cddd773bc
2 changed files with 73 additions and 36 deletions
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framework/sysutils.h
+15 -9
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@@ -73,7 +73,7 @@ typedef struct __pst_parameter : public SC_ListNode {
void* loc; // pointer to location of parameter's value
bool is_return; // whether this parameter is return value of the function
bool is_variable;// whether this parameter is function variable or argument of function
bool has_value;
bool has_value; // whether we got value of parameter or not
uint64_t value; // value of parameter
pst_context* ctx;
} pst_parameter;
@@ -81,12 +81,15 @@ typedef struct __pst_parameter : public SC_ListNode {
typedef struct __pst_handler pst_handler;
typedef struct __pst_function : public SC_ListNode {
__pst_function(pst_context* ctx) : ctx(ctx) {
__pst_function(pst_context* _ctx, __pst_function* _parent) : ctx(_ctx) {
pc = 0;
line = -1;
die = NULL;
lowpc = 0;
highpc = 0;
parent = NULL;
cursor = _ctx->cursor;
parent = _parent;
}
~__pst_function() {
@@ -102,15 +105,17 @@ typedef struct __pst_function : public SC_ListNode {
bool handle_dwarf(Dwarf_Die* d);
bool print_dwarf();
Dwarf_Addr lowpc;
Dwarf_Addr highpc;
Dwarf_Addr lowpc; // start of the function
Dwarf_Addr highpc; // next address after the end of the function
Dwarf_Die* die; // DWARF DIE containing definition of the function
std::string name; // function's name
SC_ListHead params; // array of function's parameters
unw_word_t pc; // pointer to the start of the function
SC_ListHead params; // function's parameters
unw_word_t pc; // address between lowpc & highpc (plus base address offset). actually, currently executed command
unw_cursor_t cursor; // copy of stack state of the function
int line; // line in code where function is defined
std::string file; // file name (DWARF Compilation Unit) where is function defined
pst_context* ctx;
std::string file; // file name (DWARF Compilation Unit) where function is defined
pst_function* parent; // parent function in call trace (caller)
pst_context* ctx; // context of unwinding
} pst_function;
typedef struct __pst_handler {
@@ -134,10 +139,11 @@ typedef struct __pst_handler {
}
void clear();
pst_function* add_function();
pst_function* add_function(__pst_function* fun);
void del_function(pst_function* f);
pst_function* next_function(pst_function* f);
bool handle_dwarf();
void print_dwarf();
bool unwind();
bool get_frame();