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libbacktrace: remove duplicate low_pc/high_pc/range handling

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* dwarf.c (struct pcrange): Define.
	(update_pcrange, add_ranges): New static functions.
	(add_unit_addr): Change signature to work with add_ranges.  Don't
	add base_address here.
	(add_unit_ranges): Remove.
	(find_address_ranges): Replace str/ranges parameters with
	dwarf_sections.  Use update_pcrange and add_ranges.  Change all
	callers.
	(add_function_range): Change signature to work with add_ranges.
	Don't add base_address here.
	(add_function_ranges): Remove.
	(read_function_entry): Use update_pcrange and add_ranges.

From-SVN: r279154
This commit is contained in:
Ian Lance Taylor 2019-12-10 03:41:49 +00:00 committed by Ian Lance Taylor
parent d68f5d458d
commit 4b3fc18803
2 changed files with 179 additions and 235 deletions
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15
libbacktrace/ChangeLog
View File

@ -1,3 +1,18 @@
2019-12-08 Ian Lance Taylor <iant@golang.org>
* dwarf.c (struct pcrange): Define.
(update_pcrange, add_ranges): New static functions.
(add_unit_addr): Change signature to work with add_ranges. Don't
add base_address here.
(add_unit_ranges): Remove.
(find_address_ranges): Replace str/ranges parameters with
dwarf_sections. Use update_pcrange and add_ranges. Change all
callers.
(add_function_range): Change signature to work with add_ranges.
Don't add base_address here.
(add_function_ranges): Remove.
(read_function_entry): Use update_pcrange and add_ranges.
2019-12-04 Ian Lance Taylor <iant@golang.org>
* edtest.c (test1): Add noclone attribute.

399
libbacktrace/dwarf.c
View File

@ -945,31 +945,28 @@ function_addrs_search (const void *vkey, const void *ventry)
return 0;
}
/* Add a new compilation unit address range to a vector. Returns 1 on
success, 0 on failure. */
/* Add a new compilation unit address range to a vector. This is
called via add_ranges. Returns 1 on success, 0 on failure. */
static int
add_unit_addr (struct backtrace_state *state, uintptr_t base_address,
struct unit_addrs addrs,
add_unit_addr (struct backtrace_state *state, void *rdata,
uint64_t lowpc, uint64_t highpc,
backtrace_error_callback error_callback, void *data,
struct unit_addrs_vector *vec)
void *pvec)
{
struct unit *u = (struct unit *) rdata;
struct unit_addrs_vector *vec = (struct unit_addrs_vector *) pvec;
struct unit_addrs *p;
/* Add in the base address of the module here, so that we can look
up the PC directly. */
addrs.low += base_address;
addrs.high += base_address;
/* Try to merge with the last entry. */
if (vec->count > 0)
{
p = (struct unit_addrs *) vec->vec.base + (vec->count - 1);
if ((addrs.low == p->high || addrs.low == p->high + 1)
&& addrs.u == p->u)
if ((lowpc == p->high || lowpc == p->high + 1)
&& u == p->u)
{
if (addrs.high > p->high)
p->high = addrs.high;
if (highpc > p->high)
p->high = highpc;
return 1;
}
}
@ -980,8 +977,12 @@ add_unit_addr (struct backtrace_state *state, uintptr_t base_address,
if (p == NULL)
return 0;
*p = addrs;
p->low = lowpc;
p->high = highpc;
p->u = u;
++vec->count;
return 1;
}
@ -1262,29 +1263,122 @@ lookup_abbrev (struct abbrevs *abbrevs, uint64_t code,
return (const struct abbrev *) p;
}
/* Add non-contiguous address ranges for a compilation unit. Returns
1 on success, 0 on failure. */
/* This struct is used to gather address range information while
reading attributes. We use this while building a mapping from
address ranges to compilation units and then again while mapping
from address ranges to function entries. Normally either
lowpc/highpc is set or ranges is set. */
struct pcrange {
uint64_t lowpc; /* The low PC value. */
int have_lowpc; /* Whether a low PC value was found. */
uint64_t highpc; /* The high PC value. */
int have_highpc; /* Whether a high PC value was found. */
int highpc_is_relative; /* Whether highpc is relative to lowpc. */
uint64_t ranges; /* Offset in ranges section. */
int have_ranges; /* Whether ranges is valid. */
};
/* Update PCRANGE from an attribute value. */
static void
update_pcrange (const struct attr* attr, const struct attr_val* val,
struct pcrange *pcrange)
{
switch (attr->name)
{
case DW_AT_low_pc:
if (val->encoding == ATTR_VAL_ADDRESS)
{
pcrange->lowpc = val->u.uint;
pcrange->have_lowpc = 1;
}
break;
case DW_AT_high_pc:
if (val->encoding == ATTR_VAL_ADDRESS)
{
pcrange->highpc = val->u.uint;
pcrange->have_highpc = 1;
}
else if (val->encoding == ATTR_VAL_UINT)
{
pcrange->highpc = val->u.uint;
pcrange->have_highpc = 1;
pcrange->highpc_is_relative = 1;
}
break;
case DW_AT_ranges:
if (val->encoding == ATTR_VAL_UINT
|| val->encoding == ATTR_VAL_REF_SECTION)
{
pcrange->ranges = val->u.uint;
pcrange->have_ranges = 1;
}
break;
default:
break;
}
}
/* Call ADD_RANGE for each lowpc/highpc pair in PCRANGE. RDATA is
passed to ADD_RANGE, and is either a struct unit * or a struct
function *. VEC is the vector we are adding ranges to, and is
either a struct unit_addrs_vector * or a struct function_vector *.
Returns 1 on success, 0 on error. */
static int
add_unit_ranges (struct backtrace_state *state, uintptr_t base_address,
struct unit *u, uint64_t ranges, uint64_t base,
int is_bigendian, const unsigned char *dwarf_ranges,
size_t dwarf_ranges_size,
backtrace_error_callback error_callback, void *data,
struct unit_addrs_vector *addrs)
add_ranges (struct backtrace_state *state,
const struct dwarf_sections *dwarf_sections,
uintptr_t base_address, int is_bigendian,
struct unit *u, uint64_t base, const struct pcrange *pcrange,
int (*add_range) (struct backtrace_state *state, void *rdata,
uint64_t lowpc, uint64_t highpc,
backtrace_error_callback error_callback,
void *data, void *vec),
void *rdata,
backtrace_error_callback error_callback, void *data,
void *vec)
{
struct dwarf_buf ranges_buf;
if (ranges >= dwarf_ranges_size)
if (pcrange->have_lowpc && pcrange->have_highpc)
{
uint64_t lowpc;
uint64_t highpc;
lowpc = pcrange->lowpc;
highpc = pcrange->highpc;
if (pcrange->highpc_is_relative)
highpc += lowpc;
/* Add in the base address of the module when recording PC
values, so that we can look up the PC directly. */
lowpc += base_address;
highpc += base_address;
return add_range (state, rdata, lowpc, highpc, error_callback, data,
vec);
}
if (!pcrange->have_ranges)
{
/* Did not find any address ranges to add. */
return 1;
}
if (pcrange->ranges >= dwarf_sections->size[DEBUG_RANGES])
{
error_callback (data, "ranges offset out of range", 0);
return 0;
}
ranges_buf.name = ".debug_ranges";
ranges_buf.start = dwarf_ranges;
ranges_buf.buf = dwarf_ranges + ranges;
ranges_buf.left = dwarf_ranges_size - ranges;
ranges_buf.start = dwarf_sections->data[DEBUG_RANGES];
ranges_buf.buf = dwarf_sections->data[DEBUG_RANGES] + pcrange->ranges;
ranges_buf.left = dwarf_sections->size[DEBUG_RANGES] - pcrange->ranges;
ranges_buf.is_bigendian = is_bigendian;
ranges_buf.error_callback = error_callback;
ranges_buf.data = data;
@ -1308,13 +1402,10 @@ add_unit_ranges (struct backtrace_state *state, uintptr_t base_address,
base = high;
else
{
struct unit_addrs a;
a.low = low + base;
a.high = high + base;
a.u = u;
if (!add_unit_addr (state, base_address, a, error_callback, data,
addrs))
if (!add_range (state, rdata,
low + base + base_address,
high + base + base_address,
error_callback, data, vec))
return 0;
}
}
@ -1332,9 +1423,7 @@ add_unit_ranges (struct backtrace_state *state, uintptr_t base_address,
static int
find_address_ranges (struct backtrace_state *state, uintptr_t base_address,
struct dwarf_buf *unit_buf,
const unsigned char *dwarf_str, size_t dwarf_str_size,
const unsigned char *dwarf_ranges,
size_t dwarf_ranges_size,
const struct dwarf_sections *dwarf_sections,
int is_bigendian, struct dwarf_data *altlink,
backtrace_error_callback error_callback, void *data,
struct unit *u, struct unit_addrs_vector *addrs,
@ -1344,13 +1433,7 @@ find_address_ranges (struct backtrace_state *state, uintptr_t base_address,
{
uint64_t code;
const struct abbrev *abbrev;
uint64_t lowpc;
int have_lowpc;
uint64_t highpc;
int have_highpc;
int highpc_is_relative;
uint64_t ranges;
int have_ranges;
struct pcrange pcrange;
size_t i;
code = read_uleb128 (unit_buf);
@ -1364,53 +1447,22 @@ find_address_ranges (struct backtrace_state *state, uintptr_t base_address,
if (unit_tag != NULL)
*unit_tag = abbrev->tag;
lowpc = 0;
have_lowpc = 0;
highpc = 0;
have_highpc = 0;
highpc_is_relative = 0;
ranges = 0;
have_ranges = 0;
memset (&pcrange, 0, sizeof pcrange);
for (i = 0; i < abbrev->num_attrs; ++i)
{
struct attr_val val;
if (!read_attribute (abbrev->attrs[i].form, unit_buf,
u->is_dwarf64, u->version, u->addrsize,
dwarf_str, dwarf_str_size, altlink, &val))
dwarf_sections->data[DEBUG_STR],
dwarf_sections->size[DEBUG_STR],
altlink, &val))
return 0;
switch (abbrev->attrs[i].name)
{
case DW_AT_low_pc:
if (val.encoding == ATTR_VAL_ADDRESS)
{
lowpc = val.u.uint;
have_lowpc = 1;
}
break;
case DW_AT_high_pc:
if (val.encoding == ATTR_VAL_ADDRESS)
{
highpc = val.u.uint;
have_highpc = 1;
}
else if (val.encoding == ATTR_VAL_UINT)
{
highpc = val.u.uint;
have_highpc = 1;
highpc_is_relative = 1;
}
break;
case DW_AT_ranges:
if (val.encoding == ATTR_VAL_UINT
|| val.encoding == ATTR_VAL_REF_SECTION)
{
ranges = val.u.uint;
have_ranges = 1;
}
case DW_AT_low_pc: case DW_AT_high_pc: case DW_AT_ranges:
update_pcrange (&abbrev->attrs[i], &val, &pcrange);
break;
case DW_AT_stmt_list:
@ -1440,43 +1492,25 @@ find_address_ranges (struct backtrace_state *state, uintptr_t base_address,
if (abbrev->tag == DW_TAG_compile_unit
|| abbrev->tag == DW_TAG_subprogram)
{
if (have_ranges)
{
if (!add_unit_ranges (state, base_address, u, ranges, lowpc,
is_bigendian, dwarf_ranges,
dwarf_ranges_size, error_callback,
data, addrs))
return 0;
}
else if (have_lowpc && have_highpc)
{
struct unit_addrs a;
if (highpc_is_relative)
highpc += lowpc;
a.low = lowpc;
a.high = highpc;
a.u = u;
if (!add_unit_addr (state, base_address, a, error_callback, data,
addrs))
return 0;
}
if (!add_ranges (state, dwarf_sections, base_address,
is_bigendian, u, pcrange.lowpc, &pcrange,
add_unit_addr, (void *) u, error_callback, data,
(void *) addrs))
return 0;
/* If we found the PC range in the DW_TAG_compile_unit, we
can stop now. */
if (abbrev->tag == DW_TAG_compile_unit
&& (have_ranges || (have_lowpc && have_highpc)))
&& (pcrange.have_ranges
|| (pcrange.have_lowpc && pcrange.have_highpc)))
return 1;
}
if (abbrev->has_children)
{
if (!find_address_ranges (state, base_address, unit_buf,
dwarf_str, dwarf_str_size,
dwarf_ranges, dwarf_ranges_size,
is_bigendian, altlink, error_callback, data,
u, addrs, NULL))
dwarf_sections, is_bigendian, altlink,
error_callback, data, u, addrs, NULL))
return 0;
}
}
@ -1599,11 +1633,7 @@ build_address_map (struct backtrace_state *state, uintptr_t base_address,
u->function_addrs = NULL;
u->function_addrs_count = 0;
if (!find_address_ranges (state, base_address, &unit_buf,
dwarf_sections->data[DEBUG_STR],
dwarf_sections->size[DEBUG_STR],
dwarf_sections->data[DEBUG_RANGES],
dwarf_sections->size[DEBUG_RANGES],
if (!find_address_ranges (state, base_address, &unit_buf, dwarf_sections,
is_bigendian, altlink, error_callback, data,
u, addrs, &unit_tag))
goto fail;
@ -2304,25 +2334,22 @@ read_referenced_name (struct dwarf_data *ddata, struct unit *u,
return ret;
}
/* Add a single range to U that maps to function. Returns 1 on
success, 0 on error. */
/* Add a range to a unit that maps to a function. This is called via
add_ranges. Returns 1 on success, 0 on error. */
static int
add_function_range (struct backtrace_state *state, struct dwarf_data *ddata,
struct function *function, uint64_t lowpc, uint64_t highpc,
backtrace_error_callback error_callback,
void *data, struct function_vector *vec)
add_function_range (struct backtrace_state *state, void *rdata,
uint64_t lowpc, uint64_t highpc,
backtrace_error_callback error_callback, void *data,
void *pvec)
{
struct function *function = (struct function *) rdata;
struct function_vector *vec = (struct function_vector *) pvec;
struct function_addrs *p;
/* Add in the base address here, so that we can look up the PC
directly. */
lowpc += ddata->base_address;
highpc += ddata->base_address;
if (vec->count > 0)
{
p = (struct function_addrs *) vec->vec.base + vec->count - 1;
p = (struct function_addrs *) vec->vec.base + (vec->count - 1);
if ((lowpc == p->high || lowpc == p->high + 1)
&& function == p->function)
{
@ -2341,63 +2368,8 @@ add_function_range (struct backtrace_state *state, struct dwarf_data *ddata,
p->low = lowpc;
p->high = highpc;
p->function = function;
++vec->count;
return 1;
}
/* Add PC ranges to U that map to FUNCTION. Returns 1 on success, 0
on error. */
static int
add_function_ranges (struct backtrace_state *state, struct dwarf_data *ddata,
struct unit *u, struct function *function,
uint64_t ranges, uint64_t base,
backtrace_error_callback error_callback, void *data,
struct function_vector *vec)
{
struct dwarf_buf ranges_buf;
if (ranges >= ddata->dwarf_sections.size[DEBUG_RANGES])
{
error_callback (data, "function ranges offset out of range", 0);
return 0;
}
ranges_buf.name = ".debug_ranges";
ranges_buf.start = ddata->dwarf_sections.data[DEBUG_RANGES];
ranges_buf.buf = ddata->dwarf_sections.data[DEBUG_RANGES] + ranges;
ranges_buf.left = ddata->dwarf_sections.size[DEBUG_RANGES] - ranges;
ranges_buf.is_bigendian = ddata->is_bigendian;
ranges_buf.error_callback = error_callback;
ranges_buf.data = data;
ranges_buf.reported_underflow = 0;
while (1)
{
uint64_t low;
uint64_t high;
if (ranges_buf.reported_underflow)
return 0;
low = read_address (&ranges_buf, u->addrsize);
high = read_address (&ranges_buf, u->addrsize);
if (low == 0 && high == 0)
break;
if (is_highest_address (low, u->addrsize))
base = high;
else
{
if (!add_function_range (state, ddata, function, low + base,
high + base, error_callback, data, vec))
return 0;
}
}
if (ranges_buf.reported_underflow)
return 0;
return 1;
}
@ -2421,13 +2393,7 @@ read_function_entry (struct backtrace_state *state, struct dwarf_data *ddata,
struct function *function;
struct function_vector *vec;
size_t i;
uint64_t lowpc;
int have_lowpc;
uint64_t highpc;
int have_highpc;
int highpc_is_relative;
uint64_t ranges;
int have_ranges;
struct pcrange pcrange;
int have_linkage_name;
code = read_uleb128 (unit_buf);
@ -2458,13 +2424,7 @@ read_function_entry (struct backtrace_state *state, struct dwarf_data *ddata,
memset (function, 0, sizeof *function);
}
lowpc = 0;
have_lowpc = 0;
highpc = 0;
have_highpc = 0;
highpc_is_relative = 0;
ranges = 0;
have_ranges = 0;
memset (&pcrange, 0, sizeof pcrange);
have_linkage_name = 0;
for (i = 0; i < abbrev->num_attrs; ++i)
{
@ -2549,35 +2509,8 @@ read_function_entry (struct backtrace_state *state, struct dwarf_data *ddata,
}
break;
case DW_AT_low_pc:
if (val.encoding == ATTR_VAL_ADDRESS)
{
lowpc = val.u.uint;
have_lowpc = 1;
}
break;
case DW_AT_high_pc:
if (val.encoding == ATTR_VAL_ADDRESS)
{
highpc = val.u.uint;
have_highpc = 1;
}
else if (val.encoding == ATTR_VAL_UINT)
{
highpc = val.u.uint;
have_highpc = 1;
highpc_is_relative = 1;
}
break;
case DW_AT_ranges:
if (val.encoding == ATTR_VAL_UINT
|| val.encoding == ATTR_VAL_REF_SECTION)
{
ranges = val.u.uint;
have_ranges = 1;
}
case DW_AT_low_pc: case DW_AT_high_pc: case DW_AT_ranges:
update_pcrange (&abbrev->attrs[i], &val, &pcrange);
break;
default:
@ -2597,18 +2530,14 @@ read_function_entry (struct backtrace_state *state, struct dwarf_data *ddata,
if (is_function)
{
if (have_ranges)
if (pcrange.have_ranges
|| (pcrange.have_lowpc && pcrange.have_highpc))
{
if (!add_function_ranges (state, ddata, u, function, ranges,
base, error_callback, data, vec))
return 0;
}
else if (have_lowpc && have_highpc)
{
if (highpc_is_relative)
highpc += lowpc;
if (!add_function_range (state, ddata, function, lowpc, highpc,
error_callback, data, vec))
if (!add_ranges (state, &ddata->dwarf_sections,
ddata->base_address, ddata->is_bigendian,
u, base, &pcrange, add_function_range,
(void *) function, error_callback, data,
(void *) vec))
return 0;
}
else