Group section
Hi Josh
I am getting error on the following code, and it looks like to be related to
group sections.
As you can see I changed the dwarf_elf_init to dwarf_begin_elf, but passed NULL
on the third parameter.
Do you know how should I actually deal with it?
91 bool DwarfHandle::init_dbg()
92 {
93 //int status;
94 //Dwarf_Error err;
95 if (init_dwarf_status == dwarf_status_ok) {
96 return true;
97 }
98
99 if (init_dwarf_status == dwarf_status_error) {
100 return false;
101 }
102
103 //status = dwarf_elf_init(file->e_elfp(), DW_DLC_READ,
104 // err_func, &file_data, &file_data, &err);
105
106 file_data = dwarf_begin_elf(file->e_elfp(), DWARF_C_READ, NULL);
107 cerr << "Error message:" << dwarf_errmsg(-1) << endl;
108 if (!file_data) {
109 init_dwarf_status = dwarf_status_error;
110 return false;
111 }
Re: Group section
On 03/21/2017 12:38 PM, SASHA NICOLAS DA ROCHA PINHEIRO wrote:
>
> Hi Josh
> I am getting error on the following code, and it looks like to be related to
> group sections.
What is the error?
> As you can see I changed the dwarf_elf_init to dwarf_begin_elf, but passed
> NULL on the third parameter.
> Do you know how should I actually deal with it?
>
> 91 bool DwarfHandle::init_dbg()
>
> 92 {
>
> 93 //int status;
>
> 94 //Dwarf_Error err;
>
> 95 if (init_dwarf_status == dwarf_status_ok) {
>
> 96 return true;
>
> 97 }
>
> 98
>
> 99 if (init_dwarf_status == dwarf_status_error) {
>
> 100 return false;
>
> 101 }
>
> 102
>
> 103 //status = dwarf_elf_init(file->e_elfp(), DW_DLC_READ,
>
> 104 // err_func, &file_data, &file_data, &err);
>
> 105
>
> 106 file_data = dwarf_begin_elf(file->e_elfp(), DWARF_C_READ, NULL);
>
> 107 cerr << "Error message:" << dwarf_errmsg(-1) << endl;
>
> 108 if (!file_data) {
>
> 109 init_dwarf_status = dwarf_status_error;
>
> 110 return false;
>
> 111 }
>
Re: Group section
That's the problem. It says "no error" once, in another call it says "no
reference value", and in another call "no DWARF information".
De: Josh Stone
Enviado: terça-feira, 21 de março de 2017 14:53:12
Para: SASHA NICOLAS DA ROCHA PINHEIRO; elfutils-devel@sourceware.org
Assunto: Re: Group section
On 03/21/2017 12:38 PM, SASHA NICOLAS DA ROCHA PINHEIRO wrote:
>
> Hi Josh
> I am getting error on the following code, and it looks like to be related to
> group sections.
What is the error?
> As you can see I changed the dwarf_elf_init to dwarf_begin_elf, but passed
> NULL on the third parameter.
> Do you know how should I actually deal with it?
>
> 91 bool DwarfHandle::init_dbg()
>
> 92 {
>
> 93 //int status;
>
> 94 //Dwarf_Error err;
>
> 95 if (init_dwarf_status == dwarf_status_ok) {
>
> 96 return true;
>
> 97 }
>
> 98
>
> 99 if (init_dwarf_status == dwarf_status_error) {
>
> 100 return false;
>
> 101 }
>
> 102
>
> 103 //status = dwarf_elf_init(file->e_elfp(), DW_DLC_READ,
>
> 104 // err_func, &file_data, &file_data, &err);
>
> 105
>
> 106 file_data = dwarf_begin_elf(file->e_elfp(), DWARF_C_READ, NULL);
>
> 107 cerr << "Error message:" << dwarf_errmsg(-1) << endl;
>
> 108 if (!file_data) {
>
> 109 init_dwarf_status = dwarf_status_error;
>
> 110 return false;
>
> 111 }
>
Re: Group section
On Tue, Mar 21, 2017 at 08:46:25PM +, SASHA NICOLAS DA ROCHA PINHEIRO wrote:
> That's the problem. It says "no error" once, in another call it says
> "no reference value", and in another call "no DWARF information".
> [...]
> > 106 file_data = dwarf_begin_elf(file->e_elfp(), DWARF_C_READ, NULL);
> >
> > 107 cerr << "Error message:" << dwarf_errmsg(-1) << endl;
> >
> > 108 if (!file_data) {
> >
> > 109 init_dwarf_status = dwarf_status_error;
> >
> > 110 return false;
> >
> > 111 }
Note that if file_data != NULL then the result of dwarf_errmsg (-1)
is undefined. You should first check file_data == NULL before calling
dwarf_errmsg (-1).
Cheers,
Mark
