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ec604facdba26c295e36cb15c0e119b9e8d318b3
libdwarf-code/libdwarf/checkexamples.c
David Anderson 45573a89f5 libdwarf: document dwarf_dietype() and the new 
function dwarf_offset_list()
checkexamples.c
libdwarf2.1.mm
libdwarf2.1.pdf
2016-03-07 11:33:19 -08:00

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/* The following are taken from libdwarf2.1.mm
to verify there are no silly tographical errors
in that document.
These should not be built routinely nor
should it every be executed.
The code here is what user code should be,
hence the code typed here is
PUBLIC DOMAIN.
This file is not part of libdwarf, though
it appears in the same directory as libdwarf.
*/
#include "dwarf.h"
#include "libdwarf.h"
#define NULL 0
#define FALSE 0
#define TRUE 1
void example1(Dwarf_Die somedie)
{
Dwarf_Debug dbg = 0;
Dwarf_Signed atcount;
Dwarf_Attribute *atlist;
Dwarf_Error error = 0;
Dwarf_Signed i = 0;
int errv;
errv = dwarf_attrlist(somedie, &atlist,&atcount, &error);
if (errv == DW_DLV_OK) {
for (i = 0; i < atcount; ++i) {
/* use atlist[i] */
dwarf_dealloc(dbg, atlist[i], DW_DLA_ATTR);
}
dwarf_dealloc(dbg, atlist, DW_DLA_LIST);
}
}
void example2(Dwarf_Debug dbg, Dwarf_Debug tieddbg)
{
Dwarf_Error error = 0;
int res = 0;
/* Do the dwarf_init() or dwarf_elf_init
calls to set
dbg, tieddbg at this point. Then: */
res = dwarf_set_tied_dbg(dbg,tieddbg,&error);
if (res != DW_DLV_OK) {
/* Something went wrong*/
}
}
void example3(Dwarf_Debug dbg)
{
Dwarf_Error error = 0;
int res = 0;
res = dwarf_set_tied_dbg(dbg,NULL,&error);
if (res != DW_DLV_OK) {
/* Something went wrong*/
}
}
void example4(Dwarf_Debug dbg,Dwarf_Die in_die,Dwarf_Bool is_info)
{
Dwarf_Die return_sib = 0;
Dwarf_Error error = 0;
int res = 0;
/* in_die might be NULL or a valid Dwarf_Die */
res = dwarf_siblingof_b(dbg,in_die,is_info,&return_sib, &error);
if (res == DW_DLV_OK) {
/* Use return_sib here. */
dwarf_dealloc(dbg, return_sib, DW_DLA_DIE);
/* return_sib is no longer usable for anything, we
ensure we do not use it accidentally with: */
return_sib = 0;
}
}
void example5(Dwarf_Debug dbg,Dwarf_Die in_die)
{
Dwarf_Die return_kid = 0;
Dwarf_Error error = 0;
int res = 0;
res = dwarf_child(in_die,&return_kid, &error);
if (res == DW_DLV_OK) {
/* Use return_kid here. */
dwarf_dealloc(dbg, return_kid, DW_DLA_DIE);
/* return_die is no longer usable for anything, we
ensure we do not use it accidentally with: */
return_kid = 0;
}
}
void example6(Dwarf_Debug dbg,Dwarf_Off die_offset,Dwarf_Bool is_info)
{
Dwarf_Error error = 0;
Dwarf_Die return_die = 0;
int res = 0;
res = dwarf_offdie_b(dbg,die_offset,is_info,&return_die, &error);
if (res == DW_DLV_OK) {
/* Use return_die here. */
dwarf_dealloc(dbg, return_die, DW_DLA_DIE);
/* return_die is no longer usable for anything, we
ensure we do not use it accidentally with: */
return_die = 0;
} else {
/* res could be NO ENTRY or ERROR, so no
dealloc necessary. */
}
}
void example7(Dwarf_Debug dbg, Dwarf_Die in_die,Dwarf_Bool is_info)
{
int res = 0;
Dwarf_Off cudieoff = 0;
Dwarf_Die cudie = 0;
Dwarf_Error error = 0;
print_die_data(dbg,in_die);
res = dwarf_CU_dieoffset_given_die(in_die,&cudieoff,&error);
if(res != DW_DLV_OK) {
/* FAIL */
return;
}
res = dwarf_offdie_b(dbg,cudieoff,is_info,&cudie,&error);
if(res != DW_DLV_OK) {
/* FAIL */
return;
}
print_die_data(dbg,cudie);
dwarf_dealloc(dbg,cudie, DW_DLA_DIE);
}
void example8(Dwarf_Debug dbg, Dwarf_Die somedie)
{
Dwarf_Signed atcount = 0;
Dwarf_Attribute *atlist = 0;
Dwarf_Error error = 0;
int errv = 0;
errv = dwarf_attrlist(somedie, &atlist,&atcount, &error);
if (errv == DW_DLV_OK) {
Dwarf_Signed i = 0;
for (i = 0; i < atcount; ++i) {
/* use atlist[i] */
dwarf_dealloc(dbg, atlist[i], DW_DLA_ATTR);
}
dwarf_dealloc(dbg, atlist, DW_DLA_LIST);
}
}
void exampleoffset_list(Dwarf_Debug dbg, Dwarf_Off dieoffset,
Dwarf_Bool is_info)
{
Dwarf_Unsigned offcnt = 0;
Dwarf_Off *offbuf = 0;
Dwarf_Error error = 0;
int errv = 0;
errv = dwarf_offset_list(dbg,dieoffset, is_info,
&offbuf,&offcnt, &error);
if (errv == DW_DLV_OK) {
Dwarf_Unsigned i = 0;
for (i = 0; i < offcnt; ++i) {
/* use offbuf[i] */
}
dwarf_dealloc(dbg, offbuf, DW_DLA_LIST);
}
}
void
example_loclistc(Dwarf_Debug dbg,Dwarf_Attribute someattr)
{
Dwarf_Unsigned lcount = 0;
Dwarf_Loc_Head_c loclist_head = 0;
Dwarf_Error error = 0;
int lres = 0;
lres = dwarf_get_loclist_c(someattr,&loclist_head,&lcount,&error);
if (lres == DW_DLV_OK) {
Dwarf_Unsigned i = 0;
Dwarf_Locdesc_c locentry = 0;
/* Before any return remember to call
dwarf_loc_head_c_dealloc(loclist_head); */
for (i = 0; i < lcount; ++i) {
Dwarf_Small loclist_source = 0;
Dwarf_Small lle_value = 0; /* DWARF5 */
Dwarf_Addr lopc = 0;
Dwarf_Addr hipc = 0;
Dwarf_Unsigned ulocentry_count = 0;
Dwarf_Locdesc_c locentry = 0;
/* section_offset is the section offset of the expression, not
the location description prefix. */
Dwarf_Unsigned section_offset = 0;
/* locdesc_offset is the section offset of the
location description prefix. */
Dwarf_Unsigned locdesc_offset = 0;
lres = dwarf_get_locdesc_entry_c(loclist_head,
i,
&lle_value,&lopc,&hipc,
&ulocentry_count,
&locentry,
&loclist_source,
&section_offset,
&locdesc_offset,
&error);
if (lres == DW_DLV_OK) {
/* Here, use loclist_source and
lle_value to determine what
sort of loclist it is and what to do with
the values. locentry_count will only be
more than zero if there is a set of location
operators.
One must use lle_value to determine how
to interpret lopc,hipc as sometimes they
are a target address and sometimes an
index into .debug_addr or even a length. */
Dwarf_Unsigned j = 0;
int opres = 0;
Dwarf_Small op = 0;
for (j = 0; i < ulocentry_count; ++i) {
Dwarf_Unsigned opd1 = 0;
Dwarf_Unsigned opd2 = 0;
Dwarf_Unsigned opd3 = 0;
Dwarf_Unsigned offsetforbranch = 0;
opres = dwarf_get_location_op_value_c(locentry,
j,&op,&opd1, &opd2,&opd3,&offsetforbranch,
&error);
if (opres == DW_DLV_OK) {
/* Do something with the operators. */
} else {
/*Something is wrong. */
}
}
} else {
/* Something is wrong. Do something. */
}
}
/* In case of error or any other situation where one
is giving up one can call dwarf_loc_head_c_dealloc()
to free all the memory associated with loclist_head. */
dwarf_loc_head_c_dealloc(loclist_head);
loclist_head = 0;
}
}
void
example_locexprc(Dwarf_Debug dbg,Dwarf_Ptr expr_bytes,
Dwarf_Unsigned expr_len,
Dwarf_Half addr_size,
Dwarf_Half offset_size,
Dwarf_Half version)
{
Dwarf_Loc_Head_c head = 0;
Dwarf_Locdesc_c locentry = 0;
int res2 = 0;
Dwarf_Unsigned lopc = 0;
Dwarf_Unsigned hipc = 0;
Dwarf_Unsigned ulistlen = 0;
Dwarf_Unsigned ulocentry_count = 0;
Dwarf_Unsigned section_offset = 0;
Dwarf_Unsigned locdesc_offset = 0;
Dwarf_Small lle_value = 0;
Dwarf_Small loclist_source = 0;
Dwarf_Unsigned i = 0;
Dwarf_Error error = 0;
res2 = dwarf_loclist_from_expr_c(dbg,
expr_bytes,expr_len,
addr_size,
offset_size,
version,
&head,
&ulistlen,
&error);
if(res2 == DW_DLV_NO_ENTRY) {
return;
}
if(res2 == DW_DLV_ERROR) {
return;
}
/* These are a location expression, not loclist.
So we just need the 0th entry. */
res2 = dwarf_get_locdesc_entry_c(head,
0, /* Data from 0th LocDesc */
&lle_value,
&lopc, &hipc,
&ulocentry_count,
&locentry,
&loclist_source,
&section_offset,
&locdesc_offset,
&error);
if (res2 == DW_DLV_ERROR) {
dwarf_loc_head_c_dealloc(head);
return;
} else if (res2 == DW_DLV_NO_ENTRY) {
dwarf_loc_head_c_dealloc(head);
return;
}
/* ASSERT: ulistlen == 1 */
for (i = 0; i < ulocentry_count;++i) {
Dwarf_Small op = 0;
Dwarf_Unsigned opd1 = 0;
Dwarf_Unsigned opd2 = 0;
Dwarf_Unsigned opd3 = 0;
Dwarf_Unsigned offsetforbranch = 0;
res2 = dwarf_get_location_op_value_c(locentry,
i, &op,&opd1,&opd2,&opd3,&offsetforbranch,
&error);
/* Do something with the expression operator and operands */
if (res2 != DW_DLV_OK) {
dwarf_loc_head_c_dealloc(head);
return;
}
}
dwarf_loc_head_c_dealloc(head);
}
void
example9(Dwarf_Debug dbg,Dwarf_Attribute someattr)
{
Dwarf_Signed lcount = 0;
Dwarf_Locdesc **llbuf = 0;
Dwarf_Error error = 0;
int lres = 0;
lres = dwarf_loclist_n(someattr, &llbuf,&lcount,&error);
if (lres == DW_DLV_OK) {
Dwarf_Signed i = 0;
for (i = 0; i < lcount; ++i) {
/* Use llbuf[i]. Both Dwarf_Locdesc and the
array of Dwarf_Loc it points to are
defined in libdwarf.h: they are
not opaque structs. */
dwarf_dealloc(dbg, llbuf[i]->ld_s, DW_DLA_LOC_BLOCK);
dwarf_dealloc(dbg,llbuf[i], DW_DLA_LOCDESC);
}
dwarf_dealloc(dbg, llbuf, DW_DLA_LIST);
}
}
void examplea(Dwarf_Debug dbg,Dwarf_Attribute someattr)
{
Dwarf_Signed lcount = 0;
Dwarf_Locdesc *llbuf = 0;
Dwarf_Error error = 0;
int lres = 0;
lres = dwarf_loclist(someattr, &llbuf,&lcount,&error);
if (lres == DW_DLV_OK) {
/* lcount is always 1, (and has always been 1) */
/* Use llbuf here. */
dwarf_dealloc(dbg, llbuf->ld_s, DW_DLA_LOC_BLOCK);
dwarf_dealloc(dbg, llbuf, DW_DLA_LOCDESC);
}
}
void exampleb(Dwarf_Debug dbg,Dwarf_Ptr data, Dwarf_Unsigned len)
{
Dwarf_Signed lcount = 0;
Dwarf_Locdesc *llbuf = 0;
Dwarf_Error error = 0;
int lres = 0;
lres = dwarf_loclist_from_expr(dbg,data,len, &llbuf,&lcount, &error);
if (lres == DW_DLV_OK) {
/* lcount is always 1 */
/* Use llbuf here.*/
dwarf_dealloc(dbg, llbuf->ld_s, DW_DLA_LOC_BLOCK);
dwarf_dealloc(dbg, llbuf, DW_DLA_LOCDESC);
}
}
void examplec(Dwarf_Die cu_die)
{
/* EXAMPLE: DWARF5 style access. */
Dwarf_Line *linebuf = 0;
Dwarf_Signed linecount = 0;
Dwarf_Line *linebuf_actuals = 0;
Dwarf_Signed linecount_actuals = 0;
Dwarf_Line_Context line_context = 0;
Dwarf_Signed linecount_total = 0;
Dwarf_Small table_count = 0;
Dwarf_Unsigned lineversion = 0;
Dwarf_Error err = 0;
int sres = 0;
/* ... */
/* we use 'return' here to signify we can do nothing more
at this point in the code. */
sres = dwarf_srclines_b(cu_die,&lineversion,
&table_count,&line_context,&err);
if (sres != DW_DLV_OK) {
/* Handle the DW_DLV_NO_ENTRY or DW_DLV_ERROR
No memory was allocated so there nothing
to dealloc. */
return;
}
if (table_count == 0) {
/* A line table with no actual lines. */
/*...do something, see dwarf_srclines_files_count()
etc below. */
dwarf_srclines_dealloc_b(line_context);
/* All the memory is released, the line_context
and linebuf zeroed now
as a reminder they are stale. */
linebuf = 0;
line_context = 0;
} else if (table_count == 1) {
Dwarf_Signed i = 0;
/* Standard dwarf 2,3,4, or 5 line table */
/* Do something. */
/* For this case where we have a line table we will likely
wish to get the line details: */
sres = dwarf_srclines_from_linecontext(line_context,
&linebuf,&linecount,
&err);
if (sres != DW_DLV_OK) {
/* Error. Clean up the context information. */
dwarf_srclines_dealloc_b(line_context);
return;
}
/* The lines are normal line table lines. */
for (i = 0; i < linecount; ++i) {
/* use linebuf[i] */
}
dwarf_srclines_dealloc_b(line_context);
/* All the memory is released, the line_context
and linebuf zeroed now as a reminder they are stale */
linebuf = 0;
line_context = 0;
linecount = 0;
} else {
Dwarf_Signed i = 0;
/* ASSERT: table_count == 2,
Experimental two-level line table. Version 0xf006
We do not define the meaning of this non-standard
set of tables here. */
/* For 'something C' (two-level line tables)
one codes something like this
Note that we do not define the meaning or use of two-level line
tables as these are experimental, not standard DWARF. */
sres = dwarf_srclines_two_level_from_linecontext(line_context,
&linebuf,&linecount,
&linebuf_actuals,&linecount_actuals,
&err);
if (sres == DW_DLV_OK) {
for (i = 0; i < linecount; ++i) {
/* use linebuf[i], these are the 'logicals' entries. */
}
for (i = 0; i < linecount_actuals; ++i) {
/* use linebuf_actuals[i], these are the actuals entries */
}
dwarf_srclines_dealloc_b(line_context);
line_context = 0;
linebuf = 0;
linecount = 0;
linebuf_actuals = 0;
linecount_actuals = 0;
} else if (sres == DW_DLV_NO_ENTRY) {
/* This should be impossible, but do something. */
/* Then Free the line_context */
dwarf_srclines_dealloc_b(line_context);
line_context = 0;
linebuf = 0;
linecount = 0;
linebuf_actuals = 0;
linecount_actuals = 0;
} else {
/* ERROR, show the error or something.
Free the line_context. */
dwarf_srclines_dealloc_b(line_context);
line_context = 0;
linebuf = 0;
linecount = 0;
linebuf_actuals = 0;
linecount_actuals = 0;
}
}
}
void exampled(Dwarf_Debug dbg,Dwarf_Die somedie)
{
Dwarf_Signed count = 0;
Dwarf_Line *linebuf = 0;
Dwarf_Signed i = 0;
Dwarf_Error error = 0;
int sres = 0;
sres = dwarf_srclines(somedie, &linebuf,&count, &error);
if (sres == DW_DLV_OK) {
for (i = 0; i < count; ++i) {
/* use linebuf[i] */
}
dwarf_srclines_dealloc(dbg, linebuf, count);
}
}
void examplee(Dwarf_Debug dbg,Dwarf_Die somedie)
{
Dwarf_Signed count = 0;
char **srcfiles = 0;
Dwarf_Signed i = 0;
Dwarf_Error error = 0;
int res = 0;
res = dwarf_srcfiles(somedie, &srcfiles,&count,&error);
if (res == DW_DLV_OK) {
for (i = 0; i < count; ++i) {
/* use srcfiles[i] */
dwarf_dealloc(dbg, srcfiles[i], DW_DLA_STRING);
}
dwarf_dealloc(dbg, srcfiles, DW_DLA_LIST);
}
}
void examplef(Dwarf_Debug dbg)
{
Dwarf_Signed count = 0;
Dwarf_Global *globs = 0;
Dwarf_Signed i = 0;
Dwarf_Error error = 0;
int res = 0;
res = dwarf_get_globals(dbg, &globs,&count, &error);
if (res == DW_DLV_OK) {
for (i = 0; i < count; ++i) {
/* use globs[i] */
}
dwarf_globals_dealloc(dbg, globs, count);
}
}
void exampleg(Dwarf_Debug dbg)
{
Dwarf_Error error = 0;
Dwarf_Signed count = 0;
Dwarf_Type *types = 0;
Dwarf_Signed i = 0;
int res = 0;
res = dwarf_get_pubtypes(dbg, &types,&count, &error);
if (res == DW_DLV_OK) {
for (i = 0; i < count; ++i) {
/* use types[i] */
}
dwarf_types_dealloc(dbg, types, count);
}
}
void exampleh(Dwarf_Debug dbg)
{
Dwarf_Error error = 0;
Dwarf_Signed count = 0;
Dwarf_Weak *weaks = 0;
Dwarf_Signed i = 0;
int res = 0;
res = dwarf_get_weaks(dbg, &weaks, &count, &error);
if (res == DW_DLV_OK) {
for (i = 0; i < count; ++i) {
/* use weaks[i] */
}
dwarf_weaks_dealloc(dbg, weaks, count);
}
}
void examplei(Dwarf_Debug dbg)
{
Dwarf_Error error = 0;
Dwarf_Signed count = 0;
Dwarf_Weak *weaks = 0;
Dwarf_Signed i = 0;
int res = 0;
res = dwarf_get_weaks(dbg, &weaks, &count, &error);
if (res == DW_DLV_OK) {
/* OBSOLETE: do not use dealloc for this.
See above */
for (i = 0; i < count; ++i) {
/* use weaks[i] */
dwarf_dealloc(dbg, weaks[i], DW_DLA_WEAK);
}
dwarf_dealloc(dbg, weaks, DW_DLA_LIST);
}
}
void examplej(Dwarf_Debug dbg)
{
Dwarf_Error error = 0;
Dwarf_Signed count = 0;
Dwarf_Func *funcs = 0;
Dwarf_Signed i = 0;
int fres = 0;
fres = dwarf_get_funcs(dbg, &funcs, &count, &error);
if (fres == DW_DLV_OK) {
for (i = 0; i < count; ++i) {
/* use funcs[i] */
}
dwarf_funcs_dealloc(dbg, funcs, count);
}
}
void examplek(Dwarf_Debug dbg)
{
Dwarf_Error error = 0;
Dwarf_Func *funcs = 0;
Dwarf_Signed count = 0;
Dwarf_Signed i = 0;
int fres = 0;
fres = dwarf_get_funcs(dbg, &funcs,&count, &error);
if (fres == DW_DLV_OK) {
/* OBSOLETE: see dwarf_funcs_dealloc() above */
for (i = 0; i < count; ++i) {
/* use funcs[i] */
dwarf_dealloc(dbg, funcs[i], DW_DLA_FUNC);
}
dwarf_dealloc(dbg, funcs, DW_DLA_LIST);
}
}
void examplel(Dwarf_Debug dbg)
{
Dwarf_Error error = 0;
Dwarf_Signed count = 0;
Dwarf_Type *types = 0;
Dwarf_Signed i = 0;
int res = 0;
res = dwarf_get_types(dbg, &types,&count, &error);
if (res == DW_DLV_OK) {
for (i = 0; i < count; ++i) {
/* use types[i] */
}
dwarf_types_dealloc(dbg, types, count);
}
}
void examplem(Dwarf_Debug dbg)
{
Dwarf_Error error = 0;
Dwarf_Signed count = 0;
Dwarf_Type *types = 0;
Dwarf_Signed i = 0;
int res = 0;
/* OBSOLETE: see dwarf_types_dealloc() above */
res = dwarf_get_types(dbg, &types,&count, &error);
if (res == DW_DLV_OK) {
for (i = 0; i < count; ++i) {
/* use types[i] */
dwarf_dealloc(dbg, types[i], DW_DLA_TYPENAME);
}
dwarf_dealloc(dbg, types, DW_DLA_LIST);
}
}
void examplen(Dwarf_Debug dbg)
{
Dwarf_Error error = 0;
Dwarf_Signed count = 0;
Dwarf_Var *vars = 0;
Dwarf_Signed i = 0;
int res = 0;
res = dwarf_get_vars(dbg, &vars,&count,&error);
if (res == DW_DLV_OK) {
for (i = 0; i < count; ++i) {
/* use vars[i] */
}
dwarf_vars_dealloc(dbg, vars, count);
}
}
void exampleo(Dwarf_Debug dbg)
{
Dwarf_Error error = 0;
Dwarf_Signed count = 0;
Dwarf_Var *vars = 0;
Dwarf_Signed i = 0;
int res = 0;
res = dwarf_get_vars(dbg, &vars,&count,&error);
if (res == DW_DLV_OK) {
/* DO NOT USE: see dwarf_vars_dealloc() above */
for (i = 0; i < count; ++i) {
/* use vars[i] */
dwarf_dealloc(dbg, vars[i], DW_DLA_VAR);
}
dwarf_dealloc(dbg, vars, DW_DLA_LIST);
}
}
/* This builds an list or some other data structure
(not defined) to give an import somewhere to list
the import offset and then later to enquire
if the list has unexamined offsets.
A candidate set of hypothetical functions that
callers would write:
has_unchecked_import_in_list()
get_next_import_from_list()
mark_this_offset_as_examined(macro_unit_offset);
add_offset_to_list(offset);
*/
void examplep5(Dwarf_Debug dbg, Dwarf_Die cu_die)
{
int lres = 0;
Dwarf_Unsigned version = 0;
Dwarf_Macro_Context macro_context = 0;
Dwarf_Unsigned macro_unit_offset = 0;
Dwarf_Unsigned number_of_ops = 0;
Dwarf_Unsigned ops_total_byte_len = 0;
Dwarf_Bool is_primary = TRUE;
unsigned k = 0;
Dwarf_Error err = 0;
for(;;) {
if (is_primary) {
lres = dwarf_get_macro_context(cu_die,
&version,&macro_context,
&macro_unit_offset,
&number_of_ops,
&ops_total_byte_len,
&err);
is_primary = FALSE;
} else {
if (has_unchecked_import_in_list()) {
macro_unit_offset = get_next_import_from_list();
} else {
/* We are done */
break;
}
lres = dwarf_get_macro_context_by_offset(cu_die,
macro_unit_offset,
&version,
&macro_context,
&number_of_ops,
&ops_total_byte_len,
&err);
mark_this_offset_as_examined(macro_unit_offset);
}
if (lres == DW_DLV_ERROR) {
/* Something is wrong. */
return;
}
if (lres == DW_DLV_NO_ENTRY) {
/* We are done. */
break;
}
/* lres == DW_DLV_OK) */
for (k = 0; k < number_of_ops; ++k) {
Dwarf_Unsigned section_offset = 0;
Dwarf_Half macro_operator = 0;
Dwarf_Half forms_count = 0;
const Dwarf_Small *formcode_array = 0;
Dwarf_Unsigned line_number = 0;
Dwarf_Unsigned index = 0;
Dwarf_Unsigned offset =0;
const char * macro_string =0;
int lres = 0;
lres = dwarf_get_macro_op(macro_context,
k, &section_offset,&macro_operator,
&forms_count, &formcode_array,&err);
if (lres != DW_DLV_OK) {
print_error(dbg,
"ERROR from dwarf_get_macro_op()",
lres,err);
dwarf_dealloc_macro_context(macro_context);
return;
}
switch(macro_operator) {
case 0:
/* Nothing to do. */
break;
case DW_MACRO_end_file:
/* Do something */
break;
case DW_MACRO_define:
case DW_MACRO_undef:
case DW_MACRO_define_strp:
case DW_MACRO_undef_strp:
case DW_MACRO_define_strx:
case DW_MACRO_undef_strx:
case DW_MACRO_define_sup:
case DW_MACRO_undef_sup: {
lres = dwarf_get_macro_defundef(macro_context,
k,
&line_number,
&index,
&offset,
&forms_count,
&macro_string,
&err);
if (lres != DW_DLV_OK) {
print_error(dbg,
"ERROR from sup dwarf_get_macro_defundef()",
lres,err);
dwarf_dealloc_macro_context(macro_context);
return;
}
/* do something */
}
break;
case DW_MACRO_start_file: {
lres = dwarf_get_macro_startend_file(macro_context,
k,&line_number,
&index,
&macro_string,&err);
if (lres != DW_DLV_OK) {
print_error(dbg,
"ERROR from dwarf_get_macro_startend_file()(sup)",
lres,err);
dwarf_dealloc_macro_context(macro_context);
return;
}
/* do something */
}
break;
case DW_MACRO_import: {
lres = dwarf_get_macro_import(macro_context,
k,&offset,&err);
if (lres != DW_DLV_OK) {
print_error(dbg,
"ERROR from dwarf_get_macro_import()(sup)",
lres,err);
dwarf_dealloc_macro_context(macro_context);
return;
}
add_offset_to_list(offset);
}
break;
case DW_MACRO_import_sup: {
lres = dwarf_get_macro_import(macro_context,
k,&offset,&err);
if (lres != DW_DLV_OK) {
print_error(dbg,
"ERROR from dwarf_get_macro_import()(sup)",
lres,err);
dwarf_dealloc_macro_context(macro_context);
return;
}
/* do something */
}
break;
}
}
dwarf_dealloc_macro_context(macro_context);
macro_context = 0;
}
}
void examplep2(Dwarf_Debug dbg, Dwarf_Off cur_off)
{
Dwarf_Error error = 0;
Dwarf_Signed count = 0;
Dwarf_Macro_Details *maclist = 0;
Dwarf_Signed i = 0;
Dwarf_Unsigned max = 500000; /* sanity limit */
int errv = 0;
/* Given an offset from a compilation unit,
start at that offset (from DW_AT_macroinfo)
and get its macro details. */
errv = dwarf_get_macro_details(dbg, cur_off,max,
&count,&maclist,&error);
if (errv == DW_DLV_OK) {
for (i = 0; i < count; ++i) {
/* use maclist[i] */
}
dwarf_dealloc(dbg, maclist, DW_DLA_STRING);
}
/* Loop through all the compilation units macro info from zero.
This is not guaranteed to work because DWARF does not
guarantee every byte in the section is meaningful:
there can be garbage between the macro info
for CUs. But this loop will sometimes work.
*/
cur_off = 0;
while((errv = dwarf_get_macro_details(dbg, cur_off,max,
&count,&maclist,&error))== DW_DLV_OK) {
for (i = 0; i < count; ++i) {
/* use maclist[i] */
}
cur_off = maclist[count-1].dmd_offset + 1;
dwarf_dealloc(dbg, maclist, DW_DLA_STRING);
}
}
void exampleq(Dwarf_Debug dbg)
{
Dwarf_Cie *cie_data = 0;
Dwarf_Signed cie_count = 0;
Dwarf_Fde *fde_data = 0;
Dwarf_Signed fde_count = 0;
Dwarf_Error error = 0;
int fres = 0;
fres = dwarf_get_fde_list(dbg,&cie_data,&cie_count,
&fde_data,&fde_count,&error);
if (fres == DW_DLV_OK) {
dwarf_fde_cie_list_dealloc(dbg, cie_data, cie_count,
fde_data,fde_count);
}
}
/* OBSOLETE EXAMPLE */
void exampleqb(Dwarf_Debug dbg)
{
Dwarf_Signed count = 0;
Dwarf_Cie *cie_data = 0;
Dwarf_Signed cie_count = 0;
Dwarf_Fde *fde_data = 0;
Dwarf_Signed fde_count = 0;
Dwarf_Error error = 0;
Dwarf_Signed i = 0;
int fres = 0;
fres = dwarf_get_fde_list(dbg,&cie_data,&cie_count,
&fde_data,&fde_count,&error);
if (fres == DW_DLV_OK) {
for (i = 0; i < cie_count; ++i) {
/* use cie[i] */
dwarf_dealloc(dbg, cie_data[i], DW_DLA_CIE);
}
for (i = 0; i < fde_count; ++i) {
/* use fde[i] */
dwarf_dealloc(dbg, fde_data[i], DW_DLA_FDE);
}
dwarf_dealloc(dbg, cie_data, DW_DLA_LIST);
dwarf_dealloc(dbg, fde_data, DW_DLA_LIST);
}
}
void exampler(Dwarf_Debug dbg,Dwarf_Addr mypcval)
{
/* Given a pc value
for a function find the FDE and CIE data for
the function.
Example shows basic access to FDE/CIE plus
one way to access details given a PC value.
dwarf_get_fde_n() allows accessing all FDE/CIE
data so one could build up an application-specific
table of information if that is more useful. */
Dwarf_Signed count = 0;
Dwarf_Cie *cie_data = 0;
Dwarf_Signed cie_count = 0;
Dwarf_Fde *fde_data = 0;
Dwarf_Signed fde_count = 0;
Dwarf_Error error = 0;
int fres = 0;
fres = dwarf_get_fde_list_eh(dbg,&cie_data,&cie_count,
&fde_data,&fde_count,&error);
if (fres == DW_DLV_OK) {
Dwarf_Fde myfde = 0;
Dwarf_Addr low_pc = 0;
Dwarf_Addr high_pc = 0;
fres = dwarf_get_fde_at_pc(fde_data,mypcval,
&myfde,&low_pc,&high_pc,
&error);
if (fres == DW_DLV_OK) {
Dwarf_Cie mycie = 0;
fres = dwarf_get_cie_of_fde(myfde,&mycie,&error);
if (fres == DW_DLV_OK) {
/* Now we can access a range of information
about the fde and cie applicable. */
}
}
dwarf_fde_cie_list_dealloc(dbg, cie_data, cie_count,
fde_data,fde_count);
}
/* ERROR or NO ENTRY. Do something */
}
void examples(Dwarf_Debug dbg,Dwarf_Cie cie,
Dwarf_Ptr instruction,Dwarf_Unsigned len)
{
Dwarf_Signed count = 0;
Dwarf_Frame_Op *frameops = 0;
Dwarf_Error error = 0;
int res = 0;
res = dwarf_expand_frame_instructions(cie,instruction,len,
&frameops,&count, &error);
if (res == DW_DLV_OK) {
Dwarf_Signed i = 0;
for (i = 0; i < count; ++i) {
/* use frameops[i] */
}
dwarf_dealloc(dbg, frameops, DW_DLA_FRAME_BLOCK);
}
}
void examplet(Dwarf_Debug dbg,Dwarf_Unsigned offset)
{
/* Looping through the dwarf_loc section finding loclists:
an example. */
int res;
Dwarf_Unsigned next_entry = 0;
Dwarf_Addr hipc_off = 0;
Dwarf_Addr lowpc_off = 0;
Dwarf_Ptr data = 0;
Dwarf_Unsigned entry_len = 0;
Dwarf_Error err = 0;
for(;;) {
res = dwarf_get_loclist_entry(dbg,offset,&hipc_off,
&lowpc_off, &data, &entry_len,&next_entry,&err);
if (res == DW_DLV_OK) {
/* A valid entry. */
offset = next_entry;
continue;
} else if (res ==DW_DLV_NO_ENTRY) {
/* Done! */
break;
} else {
/* Error! */
break;
}
}
}
void exampleu(Dwarf_Debug dbg)
{
Dwarf_Signed count = 0;
Dwarf_Arange *arang = 0;
int res = 0;
Dwarf_Error error = 0;
res = dwarf_get_aranges(dbg, &arang,&count, &error);
if (res == DW_DLV_OK) {
Dwarf_Signed i = 0;
for (i = 0; i < count; ++i) {
/* use arang[i] */
dwarf_dealloc(dbg, arang[i], DW_DLA_ARANGE);
}
dwarf_dealloc(dbg, arang, DW_DLA_LIST);
}
}
void examplev(Dwarf_Debug dbg,Dwarf_Unsigned offset,Dwarf_Die die)
{
Dwarf_Signed count = 0;
Dwarf_Ranges *ranges = 0;
Dwarf_Unsigned bytes = 0;
Dwarf_Error error = 0;
int res = 0;
res = dwarf_get_ranges_a(dbg,offset,die,
&ranges,&count,&bytes,&error);
if (res == DW_DLV_OK) {
Dwarf_Signed i;
for( i = 0; i < count; ++i ) {
Dwarf_Ranges *cur = ranges+i;
/* Use cur. */
}
dwarf_ranges_dealloc(dbg,ranges,count);
}
}
void examplew(Dwarf_Debug dbg,Dwarf_Unsigned offset,Dwarf_Die die)
{
Dwarf_Gdbindex gindexptr = 0;
Dwarf_Unsigned version = 0;
Dwarf_Unsigned cu_list_offset = 0;
Dwarf_Unsigned types_cu_list_offset = 0;
Dwarf_Unsigned address_area_offset = 0;
Dwarf_Unsigned symbol_table_offset = 0;
Dwarf_Unsigned constant_pool_offset = 0;
Dwarf_Unsigned section_size = 0;
Dwarf_Unsigned reserved = 0;
Dwarf_Error error = 0;
const char * section_name = 0;
int res = 0;
res = dwarf_gdbindex_header(dbg,&gindexptr,
&version,&cu_list_offset, &types_cu_list_offset,
&address_area_offset,&symbol_table_offset,
&constant_pool_offset, &section_size,
&reserved,&section_name,&error);
if (res == DW_DLV_NO_ENTRY) {
return;
} else if (res == DW_DLV_ERROR) {
return;
}
{
/* do something with the data */
Dwarf_Unsigned length = 0;
Dwarf_Unsigned typeslength = 0;
Dwarf_Unsigned i = 0;
res = dwarf_gdbindex_culist_array(gindexptr,
&length,&error);
/* Example actions. */
if (res == DW_DLV_OK) {
for(i = 0; i < length; ++i) {
Dwarf_Unsigned cuoffset = 0;
Dwarf_Unsigned culength = 0;
res = dwarf_gdbindex_culist_entry(gindexptr,
i,&cuoffset,&culength,&error);
if (res == DW_DLV_OK) {
/* Do something with cuoffset, culength */
}
}
}
res = dwarf_gdbindex_types_culist_array(gindexptr,
&typeslength,&error);
if (res == DW_DLV_OK) {
for(i = 0; i < typeslength; ++i) {
Dwarf_Unsigned cuoffset = 0;
Dwarf_Unsigned tuoffset = 0;
Dwarf_Unsigned culength = 0;
Dwarf_Unsigned type_signature = 0;
res = dwarf_gdbindex_types_culist_entry(gindexptr,
i,&cuoffset,&tuoffset,&type_signature,&error);
if (res == DW_DLV_OK) {
/* Do something with cuoffset etc. */
}
}
}
dwarf_gdbindex_free(gindexptr);
}
}
void examplewgdbindex(Dwarf_Gdbindex gdbindex)
{
Dwarf_Unsigned list_len = 0;
Dwarf_Unsigned i = 0;
int res = 0;
Dwarf_Error err = 0;
res = dwarf_gdbindex_addressarea(gdbindex, &list_len,&err);
if (res != DW_DLV_OK) {
/* Something wrong, ignore the addressarea */
}
/* Iterate through the address area. */
for( i = 0; i < list_len; i++) {
Dwarf_Unsigned lowpc = 0;
Dwarf_Unsigned highpc = 0;
Dwarf_Unsigned cu_index,
res = dwarf_gdbindex_addressarea_entry(gdbindex,i,
&lowpc,&highpc,
&cu_index,
&err);
if (res != DW_DLV_OK) {
/* Something wrong, ignore the addressarea */
return;
}
/* We have a valid address area entry, do something
with it. */
}
}
void examplex(Dwarf_Gdbindex gdbindex)
{
Dwarf_Unsigned symtab_list_length = 0;
Dwarf_Unsigned i = 0;
Dwarf_Error err = 0;
int res = 0;
res = dwarf_gdbindex_symboltable_array(gdbindex,
&symtab_list_length,&err);
if (res != DW_DLV_OK) {
return;
}
for( i = 0; i < symtab_list_length; i++) {
Dwarf_Unsigned symnameoffset = 0;
Dwarf_Unsigned cuvecoffset = 0;
Dwarf_Unsigned cuvec_len = 0;
Dwarf_Unsigned ii = 0;
const char *name = 0;
res = dwarf_gdbindex_symboltable_entry(gdbindex,i,
&symnameoffset,&cuvecoffset,
&err);
if (res != DW_DLV_OK) {
return;
}
res = dwarf_gdbindex_string_by_offset(gdbindex,
symnameoffset,&name,&err);
if(res != DW_DLV_OK) {
return;
}
res = dwarf_gdbindex_cuvector_length(gdbindex,
cuvecoffset,&cuvec_len,&err);
if( res != DW_DLV_OK) {
return;
}
for(ii = 0; ii < cuvec_len; ++ii ) {
Dwarf_Unsigned attributes = 0;
Dwarf_Unsigned cu_index = 0;
Dwarf_Unsigned reserved1 = 0;
Dwarf_Unsigned symbol_kind = 0;
Dwarf_Unsigned is_static = 0;
res = dwarf_gdbindex_cuvector_inner_attributes(
gdbindex,cuvecoffset,ii,
&attributes,&err);
if( res != DW_DLV_OK) {
return;
}
/* 'attributes' is a value with various internal
fields so we expand the fields. */
res = dwarf_gdbindex_cuvector_instance_expand_value(gdbindex,
attributes, &cu_index,&reserved1,&symbol_kind, &is_static,
&err);
if( res != DW_DLV_OK) {
return;
}
/* Do something with the attributes. */
}
}
}
void exampley(Dwarf_Debug dbg, const char *type)
{
/* type is "tu" or "cu" */
int res = 0;
Dwarf_Xu_Index_Header xuhdr = 0;
Dwarf_Unsigned version_number = 0;
Dwarf_Unsigned offsets_count = 0; /*L */
Dwarf_Unsigned units_count = 0; /* M */
Dwarf_Unsigned hash_slots_count = 0; /* N */
Dwarf_Error err = 0;
const char * ret_type = 0;
const char * section_name = 0;
res = dwarf_get_xu_index_header(dbg,
type,
&xuhdr,
&version_number,
&offsets_count,
&units_count,
&hash_slots_count,
&section_name,
&err);
if (res == DW_DLV_NO_ENTRY) {
/* No such section. */
return;
}
if (res == DW_DLV_ERROR) {
/* Something wrong. */
return;
}
/* Do something with the xuhdr here . */
dwarf_xu_header_free(xuhdr);
}
void examplez( Dwarf_Xu_Index_Header xuhdr,
Dwarf_Unsigned hash_slots_count)
{
/* hash_slots_count returned by
dwarf_get_xu_index_header(), see above. */
static Dwarf_Sig8 zerohashval;
Dwarf_Error err = 0;
Dwarf_Unsigned h = 0;
for( h = 0; h < hash_slots_count; h++) {
Dwarf_Sig8 hashval;
Dwarf_Unsigned index = 0;
Dwarf_Unsigned col = 0;
int res = 0;
res = dwarf_get_xu_hash_entry(xuhdr,h,
&hashval,&index,&err);
if (res == DW_DLV_ERROR) {
/* Oops. hash_slots_count wrong. */
return;
} else if (res == DW_DLV_NO_ENTRY) {
/* Impossible */
return;
} else if (!memcmp(&hashval,&zerohashval,sizeof(Dwarf_Sig8))
&& index == 0 ) {
/* An unused hash slot */
continue;
}
/* Here, hashval and index (a row index into offsets and lengths)
are valid. */
}
}
void exampleza(Dwarf_Xu_Index_Header xuhdr,
Dwarf_Unsigned offsets_count, Dwarf_Unsigned index )
{
Dwarf_Error err = 0;
Dwarf_Unsigned col = 0;
/* We use 'offsets_count' returned by
a dwarf_get_xu_index_header() call.
We use 'index' returned by a
dwarf_get_xu_hash_entry() call. */
for (col = 0; col < offsets_count; col++) {
Dwarf_Unsigned off = 0;
Dwarf_Unsigned len = 0;
const char * name = 0;
Dwarf_Unsigned num = 0;
int res = 0;
res = dwarf_get_xu_section_names(xuhdr,
col,&num,&name,&err);
if (res != DW_DLV_OK) {
break;
}
res = dwarf_get_xu_section_offset(xuhdr,
index,col,&off,&len,&err);
if (res != DW_DLV_OK) {
break;
}
/* Here we have the DW_SECT_ name and number
and the base offset and length of the
section data applicable to the hash
that got us here.
Use the values.*/
}
}
void examplezb(void)
{
const char * out = 0;
int res = 0;
/* The following is wrong, do not do it! */
res = dwarf_get_ACCESS_name(DW_TAG_entry_point,&out);
/* Nothing one does here with 'res' or 'out'
is meaningful. */
/* The following is meaningful.*/
res = dwarf_get_TAG_name(DW_TAG_entry_point,&out);
if( res == DW_DLV_OK) {
/* Here 'out' is a pointer one can use which
points to the string "DW_TAG_entry_point". */
} else {
/* Here 'out' has not been touched, it is
uninitialized. Do not use it. */
}
}
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