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* dwarf2read.c (dwarf2_cu): Add ranges_base.

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Delete have_addr_base, unused.  All uses updated.
	(init_cutu_and_read_dies): Process DW_AT_GNU_ranges_base.
	(dwarf2_get_pc_bounds): Add ranges_base.
	(dwarf2_record_block_ranges): Ditto.

	testsuite/
	* gdb.dwarf2/fission-base.c: New file.
	* gdb.dwarf2/fission-base.S: New file.
	* gdb.dwarf2/fission-base.exp: New file.
This commit is contained in:
Doug Evans
2012-06-28 01:10:38 +00:00
parent d26281a3fc
commit 2e3cf129e6
6 changed files with 489 additions and 11 deletions
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30
gdb/dwarf2read.c
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@@ -459,6 +459,13 @@ struct dwarf2_cu
Note this value comes from the stub CU/TU's DIE. */
ULONGEST addr_base;
/* The DW_AT_ranges_base attribute if present, zero otherwise
(zero is a valid value though).
Note this value comes from the stub CU/TU's DIE.
Also note that the value is zero in the non-DWO case so this value can
be used without needing to know whether DWO files are in use or not. */
ULONGEST ranges_base;
/* Mark used when releasing cached dies. */
unsigned int mark : 1;
@@ -475,10 +482,6 @@ struct dwarf2_cu
unsigned int checked_producer : 1;
unsigned int producer_is_gxx_lt_4_6 : 1;
unsigned int producer_is_icc : 1;
/* Non-zero if DW_AT_addr_base was found.
Used when processing DWO files. */
unsigned int have_addr_base : 1;
};
/* Persistent data held for a compilation unit, even when not
@@ -3996,13 +3999,16 @@ init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
/* There should be a DW_AT_addr_base attribute here (if needed).
We need the value before we can process DW_FORM_GNU_addr_index. */
cu->addr_base = 0;
cu->have_addr_base = 0;
attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_addr_base, cu);
if (attr)
{
cu->addr_base = DW_UNSND (attr);
cu->have_addr_base = 1;
}
cu->addr_base = DW_UNSND (attr);
/* There should be a DW_AT_ranges_base attribute here (if needed).
We need the value before we can process DW_AT_ranges. */
cu->ranges_base = 0;
attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_ranges_base, cu);
if (attr)
cu->ranges_base = DW_UNSND (attr);
if (this_cu->is_debug_types)
{
@@ -8249,9 +8255,11 @@ dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
attr = dwarf2_attr (die, DW_AT_ranges, cu);
if (attr != NULL)
{
unsigned int ranges_offset = DW_UNSND (attr) + cu->ranges_base;
/* Value of the DW_AT_ranges attribute is the offset in the
.debug_ranges section. */
if (!dwarf2_ranges_read (DW_UNSND (attr), &low, &high, cu, pst))
if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
return 0;
/* Found discontinuous range of addresses. */
ret = -1;
@@ -8411,7 +8419,7 @@ dwarf2_record_block_ranges (struct die_info *die, struct block *block,
/* The value of the DW_AT_ranges attribute is the offset of the
address range list in the .debug_ranges section. */
unsigned long offset = DW_UNSND (attr);
unsigned long offset = DW_UNSND (attr) + cu->ranges_base;
gdb_byte *buffer = dwarf2_per_objfile->ranges.buffer + offset;
/* For some target architectures, but not others, the