#include "typeprint.h"
#include "jv-lang.h"
#include "psympriv.h"
-#include "exceptions.h"
#include <sys/stat.h>
#include "completer.h"
#include "vec.h"
static void add_partial_namespace (struct partial_die_info *pdi,
CORE_ADDR *lowpc, CORE_ADDR *highpc,
- int need_pc, struct dwarf2_cu *cu);
+ int set_addrmap, struct dwarf2_cu *cu);
static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
- CORE_ADDR *highpc, int need_pc,
+ CORE_ADDR *highpc, int set_addrmap,
struct dwarf2_cu *cu);
static void add_partial_enumeration (struct partial_die_info *enum_pdi,
static void dwarf_decode_lines (struct line_header *, const char *,
struct dwarf2_cu *, struct partial_symtab *,
- int);
+ CORE_ADDR);
static void dwarf2_start_subfile (const char *, const char *, const char *);
return; /* No linetable, so no includes. */
/* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
- dwarf_decode_lines (lh, pst->dirname, cu, pst, 1);
+ dwarf_decode_lines (lh, pst->dirname, cu, pst, pst->textlow);
free_line_header (lh);
}
}
/* Process all loaded DIEs for compilation unit CU, starting at
- FIRST_DIE. The caller should pass NEED_PC == 1 if the compilation
+ FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation
unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
- DW_AT_ranges). If NEED_PC is set, then this function will set
- *LOWPC and *HIGHPC to the lowest and highest PC values found in CU
- and record the covered ranges in the addrmap. */
+ DW_AT_ranges). See the comments of add_partial_subprogram on how
+ SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */
static void
scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
- CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
+ CORE_ADDR *highpc, int set_addrmap,
+ struct dwarf2_cu *cu)
{
struct partial_die_info *pdi;
switch (pdi->tag)
{
case DW_TAG_subprogram:
- add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
+ add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
break;
case DW_TAG_constant:
case DW_TAG_variable:
add_partial_symbol (pdi, cu);
break;
case DW_TAG_namespace:
- add_partial_namespace (pdi, lowpc, highpc, need_pc, cu);
+ add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu);
break;
case DW_TAG_module:
- add_partial_module (pdi, lowpc, highpc, need_pc, cu);
+ add_partial_module (pdi, lowpc, highpc, set_addrmap, cu);
break;
case DW_TAG_imported_unit:
{
static void
add_partial_namespace (struct partial_die_info *pdi,
CORE_ADDR *lowpc, CORE_ADDR *highpc,
- int need_pc, struct dwarf2_cu *cu)
+ int set_addrmap, struct dwarf2_cu *cu)
{
/* Add a symbol for the namespace. */
/* Now scan partial symbols in that namespace. */
if (pdi->has_children)
- scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
+ scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
}
/* Read a partial die corresponding to a Fortran module. */
static void
add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
- CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
+ CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu)
{
/* Add a symbol for the namespace. */
/* Now scan partial symbols in that module. */
if (pdi->has_children)
- scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
+ scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
}
/* Read a partial die corresponding to a subprogram and create a partial
symbol for that subprogram. When the CU language allows it, this
routine also defines a partial symbol for each nested subprogram
- that this subprogram contains.
+ that this subprogram contains. If SET_ADDRMAP is true, record the
+ covered ranges in the addrmap. Set *LOWPC and *HIGHPC to the lowest
+ and highest PC values found in PDI.
- DIE my also be a lexical block, in which case we simply search
- recursively for suprograms defined inside that lexical block.
+ PDI may also be a lexical block, in which case we simply search
+ recursively for subprograms defined inside that lexical block.
Again, this is only performed when the CU language allows this
type of definitions. */
static void
add_partial_subprogram (struct partial_die_info *pdi,
CORE_ADDR *lowpc, CORE_ADDR *highpc,
- int need_pc, struct dwarf2_cu *cu)
+ int set_addrmap, struct dwarf2_cu *cu)
{
if (pdi->tag == DW_TAG_subprogram)
{
*lowpc = pdi->lowpc;
if (pdi->highpc > *highpc)
*highpc = pdi->highpc;
- if (need_pc)
+ if (set_addrmap)
{
CORE_ADDR baseaddr;
struct objfile *objfile = cu->objfile;
fixup_partial_die (pdi, cu);
if (pdi->tag == DW_TAG_subprogram
|| pdi->tag == DW_TAG_lexical_block)
- add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
+ add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
pdi = pdi->die_sibling;
}
}
/* Handle DW_AT_stmt_list for a compilation unit.
DIE is the DW_TAG_compile_unit die for CU.
- COMP_DIR is the compilation directory.
- WANT_LINE_INFO is non-zero if the pc/line-number mapping is needed. */
+ COMP_DIR is the compilation directory. LOWPC is passed to
+ dwarf_decode_lines. See dwarf_decode_lines comments about it. */
static void
handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
- const char *comp_dir) /* ARI: editCase function */
+ const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
{
struct attribute *attr;
{
cu->line_header = line_header;
make_cleanup (free_cu_line_header, cu);
- dwarf_decode_lines (line_header, comp_dir, cu, NULL, 1);
+ dwarf_decode_lines (line_header, comp_dir, cu, NULL, lowpc);
}
}
}
/* Decode line number information if present. We do this before
processing child DIEs, so that the line header table is available
for DW_AT_decl_file. */
- handle_DW_AT_stmt_list (die, cu, comp_dir);
+ handle_DW_AT_stmt_list (die, cu, comp_dir, lowpc);
/* Process all dies in compilation unit. */
if (die->child != NULL)
include_name = "hello.c"
dir_name = "."
DW_AT_comp_dir = comp_dir = "/tmp"
- DW_AT_name = "./hello.c" */
+ DW_AT_name = "./hello.c"
+
+ */
if (dir_name != NULL)
{
return;
}
+/* Return non-zero if we should add LINE to the line number table.
+ LINE is the line to add, LAST_LINE is the last line that was added,
+ LAST_SUBFILE is the subfile for LAST_LINE.
+ LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
+ had a non-zero discriminator.
+
+ We have to be careful in the presence of discriminators.
+ E.g., for this line:
+
+ for (i = 0; i < 100000; i++);
+
+ clang can emit four line number entries for that one line,
+ each with a different discriminator.
+ See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
+
+ However, we want gdb to coalesce all four entries into one.
+ Otherwise the user could stepi into the middle of the line and
+ gdb would get confused about whether the pc really was in the
+ middle of the line.
+
+ Things are further complicated by the fact that two consecutive
+ line number entries for the same line is a heuristic used by gcc
+ to denote the end of the prologue. So we can't just discard duplicate
+ entries, we have to be selective about it. The heuristic we use is
+ that we only collapse consecutive entries for the same line if at least
+ one of those entries has a non-zero discriminator. PR 17276.
+
+ Note: Addresses in the line number state machine can never go backwards
+ within one sequence, thus this coalescing is ok. */
+
+static int
+dwarf_record_line_p (unsigned int line, unsigned int last_line,
+ int line_has_non_zero_discriminator,
+ struct subfile *last_subfile)
+{
+ if (current_subfile != last_subfile)
+ return 1;
+ if (line != last_line)
+ return 1;
+ /* Same line for the same file that we've seen already.
+ As a last check, for pr 17276, only record the line if the line
+ has never had a non-zero discriminator. */
+ if (!line_has_non_zero_discriminator)
+ return 1;
+ return 0;
+}
+
+/* Use P_RECORD_LINE to record line number LINE beginning at address ADDRESS
+ in the line table of subfile SUBFILE. */
+
+static void
+dwarf_record_line (struct gdbarch *gdbarch, struct subfile *subfile,
+ unsigned int line, CORE_ADDR address,
+ record_line_ftype p_record_line)
+{
+ CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
+
+ (*p_record_line) (subfile, line, addr);
+}
+
+/* Subroutine of dwarf_decode_lines_1 to simplify it.
+ Mark the end of a set of line number records.
+ The arguments are the same as for dwarf_record_line.
+ If SUBFILE is NULL the request is ignored. */
+
+static void
+dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
+ CORE_ADDR address, record_line_ftype p_record_line)
+{
+ if (subfile != NULL)
+ dwarf_record_line (gdbarch, subfile, 0, address, p_record_line);
+}
+
/* Subroutine of dwarf_decode_lines to simplify it.
Process the line number information in LH. */
static void
dwarf_decode_lines_1 (struct line_header *lh, const char *comp_dir,
- struct dwarf2_cu *cu, const int decode_for_pst_p)
+ struct dwarf2_cu *cu, const int decode_for_pst_p,
+ CORE_ADDR lowpc)
{
const gdb_byte *line_ptr, *extended_end;
const gdb_byte *line_end;
unsigned int line = 1;
int is_stmt = lh->default_is_stmt;
int end_sequence = 0;
- CORE_ADDR addr;
unsigned char op_index = 0;
+ unsigned int discriminator = 0;
+ /* The last line number that was recorded, used to coalesce
+ consecutive entries for the same line. This can happen, for
+ example, when discriminators are present. PR 17276. */
+ unsigned int last_line = 0;
+ int line_has_non_zero_discriminator = 0;
if (!decode_for_pst_p && lh->num_file_names >= file)
{
{
/* Special opcode. */
unsigned char adj_opcode;
+ int line_delta;
adj_opcode = op_code - lh->opcode_base;
address += (((op_index + (adj_opcode / lh->line_range))
* lh->minimum_instruction_length);
op_index = ((op_index + (adj_opcode / lh->line_range))
% lh->maximum_ops_per_instruction);
- line += lh->line_base + (adj_opcode % lh->line_range);
+ line_delta = lh->line_base + (adj_opcode % lh->line_range);
+ line += line_delta;
+ if (line_delta != 0)
+ line_has_non_zero_discriminator = discriminator != 0;
if (lh->num_file_names < file || file == 0)
dwarf2_debug_line_missing_file_complaint ();
/* For now we ignore lines not starting on an
{
if (last_subfile != current_subfile)
{
- addr = gdbarch_addr_bits_remove (gdbarch, address);
- if (last_subfile)
- (*p_record_line) (last_subfile, 0, addr);
- last_subfile = current_subfile;
+ dwarf_finish_line (gdbarch, last_subfile,
+ address, p_record_line);
}
- /* Append row to matrix using current values. */
- addr = gdbarch_addr_bits_remove (gdbarch, address);
- (*p_record_line) (current_subfile, line, addr);
+ if (dwarf_record_line_p (line, last_line,
+ line_has_non_zero_discriminator,
+ last_subfile))
+ {
+ dwarf_record_line (gdbarch, current_subfile,
+ line, address, p_record_line);
+ }
+ last_subfile = current_subfile;
+ last_line = line;
}
}
+ discriminator = 0;
}
else switch (op_code)
{
case DW_LNE_set_address:
address = read_address (abfd, line_ptr, cu, &bytes_read);
- if (address == 0 && !dwarf2_per_objfile->has_section_at_zero)
+ /* If address < lowpc then it's not a usable value, it's
+ outside the pc range of the CU. However, we restrict
+ the test to only address values of zero to preserve
+ GDB's previous behaviour which is to handle the specific
+ case of a function being GC'd by the linker. */
+ if (address == 0 && address < lowpc)
{
/* This line table is for a function which has been
GCd by the linker. Ignore it. PR gdb/12528 */
break;
case DW_LNE_set_discriminator:
/* The discriminator is not interesting to the debugger;
- just ignore it. */
- line_ptr = extended_end;
+ just ignore it. We still need to check its value though:
+ if there are consecutive entries for the same
+ (non-prologue) line we want to coalesce them.
+ PR 17276. */
+ discriminator = read_unsigned_leb128 (abfd, line_ptr,
+ &bytes_read);
+ line_has_non_zero_discriminator |= discriminator != 0;
+ line_ptr += bytes_read;
break;
default:
complaint (&symfile_complaints,
{
if (last_subfile != current_subfile)
{
- addr = gdbarch_addr_bits_remove (gdbarch, address);
- if (last_subfile)
- (*p_record_line) (last_subfile, 0, addr);
- last_subfile = current_subfile;
+ dwarf_finish_line (gdbarch, last_subfile,
+ address, p_record_line);
+ }
+ if (dwarf_record_line_p (line, last_line,
+ line_has_non_zero_discriminator,
+ last_subfile))
+ {
+ dwarf_record_line (gdbarch, current_subfile,
+ line, address, p_record_line);
}
- addr = gdbarch_addr_bits_remove (gdbarch, address);
- (*p_record_line) (current_subfile, line, addr);
+ last_subfile = current_subfile;
+ last_line = line;
}
}
+ discriminator = 0;
break;
case DW_LNS_advance_pc:
{
}
break;
case DW_LNS_advance_line:
- line += read_signed_leb128 (abfd, line_ptr, &bytes_read);
- line_ptr += bytes_read;
+ {
+ int line_delta
+ = read_signed_leb128 (abfd, line_ptr, &bytes_read);
+
+ line += line_delta;
+ if (line_delta != 0)
+ line_has_non_zero_discriminator = discriminator != 0;
+ line_ptr += bytes_read;
+ }
break;
case DW_LNS_set_file:
{
if (!decode_for_pst_p)
{
last_subfile = current_subfile;
+ line_has_non_zero_discriminator = discriminator != 0;
dwarf2_start_subfile (fe->name, dir, comp_dir);
}
}
lh->file_names[file - 1].included_p = 1;
if (!decode_for_pst_p)
{
- addr = gdbarch_addr_bits_remove (gdbarch, address);
- (*p_record_line) (current_subfile, 0, addr);
+ dwarf_finish_line (gdbarch, current_subfile, address,
+ p_record_line);
}
}
}
as the corresponding symtab. Since COMP_DIR is not used in the name of the
symtab we don't use it in the name of the psymtabs we create.
E.g. expand_line_sal requires this when finding psymtabs to expand.
- A good testcase for this is mb-inline.exp. */
+ A good testcase for this is mb-inline.exp.
+
+ LOWPC is the lowest address in CU (or 0 if not known). */
static void
dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
struct dwarf2_cu *cu, struct partial_symtab *pst,
- int want_line_info)
+ CORE_ADDR lowpc)
{
struct objfile *objfile = cu->objfile;
const int decode_for_pst_p = (pst != NULL);
struct subfile *first_subfile = current_subfile;
- if (want_line_info)
- dwarf_decode_lines_1 (lh, comp_dir, cu, decode_for_pst_p);
+ dwarf_decode_lines_1 (lh, comp_dir, cu, decode_for_pst_p, lowpc);
if (decode_for_pst_p)
{
/* GCJ will output '<init>' for Java constructor names.
For this special case, return the name of the parent class. */
- /* GCJ may output suprogram DIEs with AT_specification set.
+ /* GCJ may output subprogram DIEs with AT_specification set.
If so, use the name of the specified DIE. */
spec_die = die_specification (die, &spec_cu);
if (spec_die != NULL)
{
struct dwarf2_per_cu_offset_and_type **slot, ofs;
struct objfile *objfile = cu->objfile;
+ struct attribute *attr;
+ struct dynamic_prop prop;
/* For Ada types, make sure that the gnat-specific data is always
initialized (if not already set). There are a few types where
&& !HAVE_GNAT_AUX_INFO (type))
INIT_GNAT_SPECIFIC (type);
+ /* Read DW_AT_data_location and set in type. */
+ attr = dwarf2_attr (die, DW_AT_data_location, cu);
+ if (attr_to_dynamic_prop (attr, die, cu, &prop))
+ {
+ TYPE_DATA_LOCATION (type)
+ = obstack_alloc (&objfile->objfile_obstack, sizeof (prop));
+ *TYPE_DATA_LOCATION (type) = prop;
+ }
+
if (dwarf2_per_objfile->die_type_hash == NULL)
{
dwarf2_per_objfile->die_type_hash =
projects / platform / upstream / binutils.git / blobdiff