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Mark pieces of values as unavailable if the corresponding memory

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is unavailable.

	gdb/
	* valops.c: Include tracepoint.h.
	(value_fetch_lazy): Use read_value_memory.
	(read_value_memory): New.
	* value.h (read_value_memory): Declare.
	* dwarf2loc.c (read_pieced_value): Use read_value_memory.
	* exec.c (section_table_available_memory): New function.
	* exec.h (section_table_available_memory): Declare.
This commit is contained in:
Pedro Alves
2011-02-14 11:21:25 +00:00
parent 2a7498d819
commit e6ca34fcfb
6 changed files with 163 additions and 11 deletions
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93
gdb/valops.c
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@ -38,7 +38,7 @@
#include "cp-support.h"
#include "dfp.h"
#include "user-regs.h"
#include "tracepoint.h"
#include <errno.h>
#include "gdb_string.h"
#include "gdb_assert.h"
@ -1009,12 +1009,8 @@ value_fetch_lazy (struct value *val)
int length = TYPE_LENGTH (check_typedef (value_enclosing_type (val)));
if (length)
{
if (value_stack (val))
read_stack (addr, value_contents_all_raw (val), length);
else
read_memory (addr, value_contents_all_raw (val), length);
}
read_value_memory (val, 0, value_stack (val),
addr, value_contents_all_raw (val), length);
}
else if (VALUE_LVAL (val) == lval_register)
{
@ -1113,6 +1109,89 @@ value_fetch_lazy (struct value *val)
return 0;
}
void
read_value_memory (struct value *val, int embedded_offset,
int stack, CORE_ADDR memaddr,
gdb_byte *buffer, size_t length)
{
if (length)
{
VEC(mem_range_s) *available_memory;
if (get_traceframe_number () < 0
|| !traceframe_available_memory (&available_memory, memaddr, length))
{
if (stack)
read_stack (memaddr, buffer, length);
else
read_memory (memaddr, buffer, length);
}
else
{
struct target_section_table *table;
struct cleanup *old_chain;
CORE_ADDR unavail;
mem_range_s *r;
int i;
/* Fallback to reading from read-only sections. */
table = target_get_section_table (&exec_ops);
available_memory =
section_table_available_memory (available_memory,
memaddr, length,
table->sections,
table->sections_end);
old_chain = make_cleanup (VEC_cleanup(mem_range_s),
&available_memory);
normalize_mem_ranges (available_memory);
/* Mark which bytes are unavailable, and read those which
are available. */
unavail = memaddr;
for (i = 0;
VEC_iterate (mem_range_s, available_memory, i, r);
i++)
{
if (mem_ranges_overlap (r->start, r->length,
memaddr, length))
{
CORE_ADDR lo1, hi1, lo2, hi2;
CORE_ADDR start, end;
/* Get the intersection window. */
lo1 = memaddr;
hi1 = memaddr + length;
lo2 = r->start;
hi2 = r->start + r->length;
start = max (lo1, lo2);
end = min (hi1, hi2);
gdb_assert (end - memaddr <= length);
if (start > unavail)
mark_value_bytes_unavailable (val,
(embedded_offset
+ unavail - memaddr),
start - unavail);
unavail = end;
read_memory (start, buffer + start - memaddr, end - start);
}
}
if (unavail != memaddr + length)
mark_value_bytes_unavailable (val,
embedded_offset + unavail - memaddr,
(memaddr + length) - unavail);
do_cleanups (old_chain);
}
}
}
/* Store the contents of FROMVAL into the location of TOVAL.
Return a new value with the location of TOVAL and contents of FROMVAL. */