{
LONGEST length = read_initial_length (abfd, buf, bytes_read);
- gdb_assert (cu_header->initial_length_size == 4
- || cu_header->initial_length_size == 8
- || cu_header->initial_length_size == 12);
+ if (cu_header != nullptr)
+ {
+ gdb_assert (cu_header->initial_length_size == 4
+ || cu_header->initial_length_size == 8
+ || cu_header->initial_length_size == 12);
- if (cu_header->initial_length_size != *bytes_read)
- complaint (_("intermixed 32-bit and 64-bit DWARF sections"));
+ if (cu_header->initial_length_size != *bytes_read)
+ complaint (_("intermixed 32-bit and 64-bit DWARF sections"));
+ }
*offset_size = (*bytes_read == 4) ? 4 : 8;
return length;
}
-/* Read directory or file name entry format, starting with byte of
- format count entries, ULEB128 pairs of entry formats, ULEB128 of
- entries count and the entries themselves in the described entry
- format. */
+
+/* Like read_formatted_entries but the .debug_line and .debug_line_str
+ are stored in LINE_BUFP and LINE_STR_DATA. This is used for cases
+ where these sections are read from separate files without necessarily
+ having access to the entire debuginfo file they originate from. */
static void
-read_formatted_entries (dwarf2_per_objfile *per_objfile, bfd *abfd,
- const gdb_byte **bufp, struct line_header *lh,
- unsigned int offset_size,
- void (*callback) (struct line_header *lh,
- const char *name,
- dir_index d_index,
- unsigned int mod_time,
- unsigned int length))
+read_formatted_entries
+ (bfd *parent_bfd, const gdb_byte **line_bufp,
+ const gdb::array_view<const gdb_byte> line_str_data,
+ struct line_header *lh,
+ unsigned int offset_size,
+ void (*callback) (struct line_header *lh,
+ const char *name,
+ dir_index d_index,
+ unsigned int mod_time,
+ unsigned int length))
{
gdb_byte format_count, formati;
ULONGEST data_count, datai;
- const gdb_byte *buf = *bufp;
+ const gdb_byte *buf = *line_bufp;
+ const gdb_byte *str_buf = line_str_data.data ();
const gdb_byte *format_header_data;
unsigned int bytes_read;
- format_count = read_1_byte (abfd, buf);
+ format_count = read_1_byte (parent_bfd, buf);
buf += 1;
format_header_data = buf;
for (formati = 0; formati < format_count; formati++)
{
- read_unsigned_leb128 (abfd, buf, &bytes_read);
+ read_unsigned_leb128 (parent_bfd, buf, &bytes_read);
buf += bytes_read;
- read_unsigned_leb128 (abfd, buf, &bytes_read);
+ read_unsigned_leb128 (parent_bfd, buf, &bytes_read);
buf += bytes_read;
}
- data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
+ data_count = read_unsigned_leb128 (parent_bfd, buf, &bytes_read);
buf += bytes_read;
for (datai = 0; datai < data_count; datai++)
{
for (formati = 0; formati < format_count; formati++)
{
- ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
+ ULONGEST content_type = read_unsigned_leb128 (parent_bfd, format, &bytes_read);
format += bytes_read;
- ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
+ ULONGEST form = read_unsigned_leb128 (parent_bfd, format, &bytes_read);
format += bytes_read;
gdb::optional<const char *> string;
switch (form)
{
case DW_FORM_string:
- string.emplace (read_direct_string (abfd, buf, &bytes_read));
+ string.emplace (read_direct_string (parent_bfd, buf, &bytes_read));
buf += bytes_read;
break;
case DW_FORM_line_strp:
{
- const char *str
- = per_objfile->read_line_string (buf, offset_size);
+ if (line_str_data.empty ())
+ error (_("Dwarf Error: DW_FORM_line_strp used without " \
+ "required section"));
+ if (line_str_data.size () <= offset_size)
+ error (_("Dwarf Error: DW_FORM_line_strp pointing outside " \
+ "of section .debug_line"));
+
+ ULONGEST str_offset = read_offset (parent_bfd, buf, offset_size);
+
+ const char *str;
+ if (str_buf[str_offset] == '\0')
+ str = nullptr;
+ else
+ str = (const char *) (str_buf + str_offset);
string.emplace (str);
buf += offset_size;
+ break;
}
- break;
case DW_FORM_data1:
- uint.emplace (read_1_byte (abfd, buf));
+ uint.emplace (read_1_byte (parent_bfd, buf));
buf += 1;
break;
case DW_FORM_data2:
- uint.emplace (read_2_bytes (abfd, buf));
+ uint.emplace (read_2_bytes (parent_bfd, buf));
buf += 2;
break;
case DW_FORM_data4:
- uint.emplace (read_4_bytes (abfd, buf));
+ uint.emplace (read_4_bytes (parent_bfd, buf));
buf += 4;
break;
case DW_FORM_data8:
- uint.emplace (read_8_bytes (abfd, buf));
+ uint.emplace (read_8_bytes (parent_bfd, buf));
buf += 8;
break;
break;
case DW_FORM_udata:
- uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
+ uint.emplace (read_unsigned_leb128 (parent_bfd, buf, &bytes_read));
buf += bytes_read;
break;
callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
}
- *bufp = buf;
+ *line_bufp = buf;
}
/* See line-header.h. */
line_header_up
-dwarf_decode_line_header (sect_offset sect_off, bool is_dwz,
- dwarf2_per_objfile *per_objfile,
- struct dwarf2_section_info *section,
- const struct comp_unit_head *cu_header,
- const char *comp_dir)
+dwarf_decode_line_header (bfd *parent_bfd,
+ gdb::array_view<const gdb_byte> line_data,
+ gdb::array_view<const gdb_byte> line_str_data,
+ const gdb_byte **debug_line_ptr,
+ bool is_dwz,
+ const struct comp_unit_head *cu_header,
+ const char *comp_dir)
{
- const gdb_byte *line_ptr;
+ const gdb_byte *line_ptr, *buf;
unsigned int bytes_read, offset_size;
int i;
const char *cur_dir, *cur_file;
- bfd *abfd = section->get_bfd_owner ();
+ buf = *debug_line_ptr;
/* Make sure that at least there's room for the total_length field.
That could be 12 bytes long, but we're just going to fudge that. */
- if (to_underlying (sect_off) + 4 >= section->size)
+ if (buf + 4 >= line_data.data () + line_data.size ())
{
dwarf2_statement_list_fits_in_line_number_section_complaint ();
return 0;
line_header_up lh (new line_header (comp_dir));
- lh->sect_off = sect_off;
+ lh->sect_off = (sect_offset) (buf - line_data.data ());
lh->offset_in_dwz = is_dwz;
- line_ptr = section->buffer + to_underlying (sect_off);
+ line_ptr = buf;
/* Read in the header. */
LONGEST unit_length
- = read_checked_initial_length_and_offset (abfd, line_ptr, cu_header,
+ = read_checked_initial_length_and_offset (parent_bfd, buf, cu_header,
&bytes_read, &offset_size);
- line_ptr += bytes_read;
- const gdb_byte *start_here = line_ptr;
+ line_ptr += bytes_read;
- if (line_ptr + unit_length > (section->buffer + section->size))
+ if (line_ptr + unit_length > buf + line_data.size ())
{
dwarf2_statement_list_fits_in_line_number_section_complaint ();
return 0;
}
+
+ const gdb_byte *start_here = line_ptr;
+
lh->statement_program_end = start_here + unit_length;
- lh->version = read_2_bytes (abfd, line_ptr);
+ lh->version = read_2_bytes (parent_bfd, line_ptr);
line_ptr += 2;
if (lh->version > 5)
{
/* This is a version we don't understand. The format could have
changed in ways we don't handle properly so just punt. */
complaint (_("unsupported version in .debug_line section"));
- return NULL;
+ return nullptr;
}
if (lh->version >= 5)
{
gdb_byte segment_selector_size;
/* Skip address size. */
- read_1_byte (abfd, line_ptr);
+ read_1_byte (parent_bfd, line_ptr);
line_ptr += 1;
- segment_selector_size = read_1_byte (abfd, line_ptr);
+ segment_selector_size = read_1_byte (parent_bfd, line_ptr);
line_ptr += 1;
if (segment_selector_size != 0)
{
complaint (_("unsupported segment selector size %u "
"in .debug_line section"),
segment_selector_size);
- return NULL;
+ return nullptr;
}
}
- LONGEST header_length = read_offset (abfd, line_ptr, offset_size);
+ LONGEST header_length = read_offset (parent_bfd, line_ptr, offset_size);
line_ptr += offset_size;
lh->statement_program_start = line_ptr + header_length;
- lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
+
+ lh->minimum_instruction_length = read_1_byte (parent_bfd, line_ptr);
line_ptr += 1;
if (lh->version >= 4)
{
- lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
+ lh->maximum_ops_per_instruction = read_1_byte (parent_bfd, line_ptr);
line_ptr += 1;
}
else
"in `.debug_line' section"));
}
- lh->default_is_stmt = read_1_byte (abfd, line_ptr);
+ lh->default_is_stmt = read_1_byte (parent_bfd, line_ptr);
line_ptr += 1;
- lh->line_base = read_1_signed_byte (abfd, line_ptr);
+
+ lh->line_base = read_1_signed_byte (parent_bfd, line_ptr);
line_ptr += 1;
- lh->line_range = read_1_byte (abfd, line_ptr);
+
+ lh->line_range = read_1_byte (parent_bfd, line_ptr);
line_ptr += 1;
- lh->opcode_base = read_1_byte (abfd, line_ptr);
+
+ lh->opcode_base = read_1_byte (parent_bfd, line_ptr);
line_ptr += 1;
+
lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
for (i = 1; i < lh->opcode_base; ++i)
{
- lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
+ lh->standard_opcode_lengths[i] = read_1_byte (parent_bfd, line_ptr);
line_ptr += 1;
}
if (lh->version >= 5)
{
/* Read directory table. */
- read_formatted_entries (per_objfile, abfd, &line_ptr, lh.get (),
- offset_size,
- [] (struct line_header *header, const char *name,
- dir_index d_index, unsigned int mod_time,
- unsigned int length)
+ read_formatted_entries
+ (parent_bfd, &line_ptr, line_str_data,
+ lh.get (), offset_size,
+ [] (struct line_header *header, const char *name,
+ dir_index d_index, unsigned int mod_time,
+ unsigned int length)
{
header->add_include_dir (name);
});
/* Read file name table. */
- read_formatted_entries (per_objfile, abfd, &line_ptr, lh.get (),
- offset_size,
- [] (struct line_header *header, const char *name,
- dir_index d_index, unsigned int mod_time,
- unsigned int length)
+ read_formatted_entries
+ (parent_bfd, &line_ptr, line_str_data,
+ lh.get (), offset_size,
+ [] (struct line_header *header, const char *name,
+ dir_index d_index, unsigned int mod_time,
+ unsigned int length)
{
header->add_file_name (name, d_index, mod_time, length);
});
else
{
/* Read directory table. */
- while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
+ while ((cur_dir = read_direct_string (parent_bfd, line_ptr, &bytes_read)) != nullptr)
{
line_ptr += bytes_read;
lh->add_include_dir (cur_dir);
line_ptr += bytes_read;
/* Read file name table. */
- while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
+ while ((cur_file = read_direct_string (parent_bfd, line_ptr, &bytes_read)) != nullptr)
{
unsigned int mod_time, length;
dir_index d_index;
line_ptr += bytes_read;
- d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ d_index = (dir_index) read_unsigned_leb128 (parent_bfd, line_ptr, &bytes_read);
line_ptr += bytes_read;
- mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ mod_time = read_unsigned_leb128 (parent_bfd, line_ptr, &bytes_read);
line_ptr += bytes_read;
- length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ length = read_unsigned_leb128 (parent_bfd, line_ptr, &bytes_read);
line_ptr += bytes_read;
lh->add_file_name (cur_file, d_index, mod_time, length);
line_ptr += bytes_read;
}
- if (line_ptr > (section->buffer + section->size))
+ if (line_ptr > (buf + line_data.size ()))
complaint (_("line number info header doesn't "
"fit in `.debug_line' section"));
+ *debug_line_ptr += unit_length + offset_size;
return lh;
}
+
+line_header_up
+dwarf_decode_line_header (sect_offset sect_off, bool is_dwz,
+ dwarf2_per_objfile *per_objfile,
+ struct dwarf2_section_info *section,
+ const struct comp_unit_head *cu_header,
+ const char *comp_dir)
+{
+ struct objfile *objfile = per_objfile->objfile;
+ struct dwarf2_per_bfd *per_bfd = per_objfile->per_bfd;
+
+ /* Read .debug_line. */
+ dwarf2_section_info *line_sec = &per_bfd->line;
+ bfd_size_type line_size = line_sec->get_size (objfile);
+
+ gdb::array_view<const gdb_byte> line (line_sec->buffer, line_size);
+
+ /* Read .debug_line_str. */
+ dwarf2_section_info *line_str_sec = &per_bfd->line_str;
+ bfd_size_type line_str_size = line_str_sec->get_size (objfile);
+
+ gdb::array_view<const gdb_byte> line_str (line_str_sec->buffer,
+ line_str_size);
+
+ const gdb_byte *line_ptr = line.data () + to_underlying (sect_off);
+
+ return dwarf_decode_line_header
+ (per_bfd->obfd, line, line_str, &line_ptr,
+ is_dwz, cu_header, comp_dir);
+}
#include "gdbsupport/gdb_optional.h"
#include "gdbsupport/underlying.h"
#include "gdbsupport/hash_enum.h"
+#include "gdbsupport/scoped_mmap.h"
#include "filename-seen-cache.h"
#include "producer.h"
#include <fcntl.h>
return this_cu->file_names;
}
+#if !HAVE_SYS_MMAN_H
+
+bool
+mapped_debug_line::contains_matching_filename
+ (gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher)
+{
+ return false;
+}
+
+gdb::array_view<const gdb_byte>
+mapped_debug_line::read_debug_line_separate
+ (char *filename, std::unique_ptr<index_cache_resource> *resource)
+{
+ return {};
+}
+
+bool
+mapped_debug_line::read_debug_line_from_debuginfod (objfile *objfile)
+{
+ return false;
+}
+
+#else /* !HAVE_SYS_MMAN_H */
+
+struct line_resource_mmap final : public index_cache_resource
+{
+ /* Try to mmap FILENAME. Throw an exception on failure, including if the
+ file doesn't exist. */
+ line_resource_mmap (const char *filename)
+ : mapping (mmap_file (filename))
+ {}
+
+ scoped_mmap mapping;
+};
+
+/* See read.h. */
+
+bool
+mapped_debug_line::contains_matching_filename
+ (gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher)
+{
+ for (line_header_up &lh : line_headers)
+ for (file_entry &fe : lh->file_names ())
+ {
+ const char *filename = fe.name;
+
+ if (file_matcher (fe.name, false))
+ return true;
+
+ bool basename_match = file_matcher (lbasename (fe.name), true);
+
+ if (!basenames_may_differ && !basename_match)
+ continue;
+
+ /* DW_AT_comp_dir is not explicitly mentioned in the .debug_line
+ until DWARF5. Since we don't have access to the CU at this
+ point we just check for a partial match on the filename.
+ If there is a match, the full debuginfo will be downloaded
+ ane the match will be re-evalute with DW_AT_comp_dir. */
+ if (lh->version < 5 && fe.d_index == 0)
+ return basename_match;
+
+ const char *dirname = fe.include_dir (&*lh);
+ std::string fullname;
+
+ if (dirname == nullptr || IS_ABSOLUTE_PATH (filename))
+ fullname = filename;
+ else
+ fullname = std::string (dirname) + SLASH_STRING + filename;
+
+ gdb::unique_xmalloc_ptr<char> rewritten
+ = rewrite_source_path (fullname.c_str ());
+ if (rewritten != nullptr)
+ fullname = rewritten.release ();
+
+ if (file_matcher (fullname.c_str (), false))
+ return true;
+ }
+
+ return false;
+}
+
+/* See read.h. */
+
+gdb::array_view<const gdb_byte>
+mapped_debug_line::read_debug_line_separate
+ (char *filename, std::unique_ptr<index_cache_resource> *resource)
+{
+ if (filename == nullptr)
+ return {};
+
+ try
+ {
+ line_resource_mmap *mmap_resource
+ = new line_resource_mmap (filename);
+
+ resource->reset (mmap_resource);
+
+ return gdb::array_view<const gdb_byte>
+ ((const gdb_byte *) mmap_resource->mapping.get (),
+ mmap_resource->mapping.size ());
+ }
+ catch (const gdb_exception &except)
+ {
+ exception_print (gdb_stderr, except);
+ }
+
+ return {};
+}
+
+/* See read.h. */
+
+bool
+mapped_debug_line::read_debug_line_from_debuginfod (objfile *objfile)
+{
+ const bfd_build_id *build_id = build_id_bfd_get (objfile->obfd.get ());
+ if (build_id == nullptr)
+ return false;
+
+ gdb::unique_xmalloc_ptr<char> line_path;
+ scoped_fd line_fd = debuginfod_section_query (build_id->data,
+ build_id->size,
+ bfd_get_filename
+ (objfile->obfd.get ()),
+ ".debug_line",
+ &line_path);
+
+ if (line_fd.get () < 0)
+ return false;
+
+ gdb::unique_xmalloc_ptr<char> line_str_path;
+ scoped_fd line_str_fd = debuginfod_section_query (build_id->data,
+ build_id->size,
+ bfd_get_filename
+ (objfile->obfd.get ()),
+ ".debug_line_str",
+ &line_str_path);
+
+ line_data = read_debug_line_separate (line_path.get (), &line_resource);
+ line_str_data = read_debug_line_separate (line_str_path.get (),
+ &line_str_resource);
+
+ const gdb_byte *line_ptr = line_data.data ();
+
+ while (line_ptr < line_data.data () + line_data.size ())
+ {
+ line_header_up lh
+ = dwarf_decode_line_header (objfile->obfd.get (),
+ line_data, line_str_data,
+ &line_ptr, false,
+ nullptr, nullptr);
+ line_headers.emplace_back (lh.release ());
+ }
+
+ return true;
+}
+#endif /* !HAVE_SYS_MMAN_H */
+
+mapped_debug_line::mapped_debug_line (objfile *objfile)
+{
+ if (!read_debug_line_from_debuginfod (objfile))
+ line_headers.clear ();
+}
+
/* A helper for the "quick" functions which computes and caches the
real path for a given file name from the line table. */
projects / thirdparty / binutils-gdb.git / commitdiff
