def Parse(self, lines):
"""Parses a linker map file.
Args:
lines: Iterable of lines, the first of which has been consumed to
identify file type.
Returns:
A tuple of (section_ranges, symbols).
"""
# Newest format:
# VMA LMA Size Align Out In Symbol
# 194 194 13 1 .interp
# 194 194 13 1 <internal>:(.interp)
# 1a8 1a8 22d8 4 .ARM.exidx
# 1b0 1b0 8 4 obj/sandbox/syscall.o:(.ARM.exidx)
# 400 400 123400 64 .text
# 600 600 14 4 ...:(.text.OUTLINED_FUNCTION_0)
# 600 600 0 1 $x.3
# 600 600 14 1 OUTLINED_FUNCTION_0
# 123800 123800 20000 256 .rodata
# 123800 123800 4 4 ...:o:(.rodata._ZN3fooE.llvm.1234)
# 123800 123800 4 1 foo (.llvm.1234)
# 123804 123804 4 4 ...:o:(.rodata.bar.llvm.1234)
# 123804 123804 4 1 bar.llvm.1234
# Older format:
# Address Size Align Out In Symbol
# 00000000002002a8 000000000000001c 1 .interp
# 00000000002002a8 000000000000001c 1 <internal>:(.interp)
# ...
# 0000000000201000 0000000000000202 16 .text
# 0000000000201000 000000000000002a 1 /[...]/crt1.o:(.text)
# 0000000000201000 0000000000000000 0 _start
# 000000000020102a 0000000000000000 1 /[...]/crti.o:(.text)
# 0000000000201030 00000000000000bd 16 /[...]/crtbegin.o:(.text)
# 0000000000201030 0000000000000000 0 deregister_tm_clones
# 0000000000201060 0000000000000000 0 register_tm_clones
# 00000000002010a0 0000000000000000 0 __do_global_dtors_aux
# 00000000002010c0 0000000000000000 0 frame_dummy
# 00000000002010ed 0000000000000071 1 a.o:(.text)
# 00000000002010ed 0000000000000071 0 main
syms = []
cur_section = None
cur_section_is_useful = False
promoted_name_count = 0
# |is_partial| indicates that an eligible Level 3 line should be used to
# update |syms[-1].full_name| instead of creating a new symbol.
is_partial = False
# Assembly code can create consecutive Level 3 lines with |size == 0|. These
# lines can represent
# (1) assembly functions (should form symbol), or
# (2) assembly labels (should NOT form symbol).
# It seems (2) correlates with the presence of a leading Level 3 line with
# |size > 0|. This gives rise to the following strategy: Each symbol S from
# a Level 3 line suppresses Level 3 lines with |address| less than
# |next_usable_address := S.address + S.size|.
next_usable_address = 0
# For Thin-LTO, a map from each address to the Thin-LTO cache file. This
# provides hints downstream to identify object_paths for .L.ref.tmp symbols,
# but is not useful in the final output. Therefore it's stored separately,
# instead of being in Symbol.
thin_map = {}
tokenizer = self.Tokenize(lines)
in_partitions = False
in_jump_table = False
jump_tables_count = 0
jump_entries_count = 0
for (line, address, size, level, span, tok) in tokenizer:
# Level 1 data match the "Out" column. They specify sections or
# PROVIDE_HIDDEN lines.
if level == 1:
# Ignore sections that belong to feature library partitions. Seeing a
# partition name is an indicator that we've entered a list of feature
# partitions. After these, a single .part.end section will follow to
# reserve memory at runtime. Seeing the .part.end section also marks the
# end of partition sections in the map file.
if tok.endswith('_partition'):
in_partitions = True
elif tok == '.part.end':
# Note that we want to retain .part.end section, so it's fine to
# restart processing on this section, rather than the next one.
in_partitions = False
if in_partitions:
# For now, completely ignore feature partitions.
cur_section = None
cur_section_is_useful = False
else:
if not tok.startswith('PROVIDE_HIDDEN'):
self._section_ranges[tok] = (address, size)
cur_section = tok
# E.g., Want to convert "(.text._name)" -> "_name" later.
mangled_start_idx = len(cur_section) + 2
cur_section_is_useful = (
cur_section in models.BSS_SECTIONS
or cur_section in (models.SECTION_RODATA, models.SECTION_TEXT)
or cur_section.startswith(models.SECTION_DATA))
elif cur_section_is_useful:
# Level 2 data match the "In" column. They specify object paths and
# section names within objects, or '<internal>:...'.
if level == 2:
# E.g., 'path.o:(.text._name)' => ['path.o', '(.text._name)'].
cur_obj, paren_value = tok.split(':')
in_jump_table = '.L.cfi.jumptable' in paren_value
if in_jump_table:
# Store each CFI jump table as a Level 2 symbol, whose Level 3
# details are discarded.
jump_tables_count += 1
cur_obj = '' # Replaces 'lto.tmp' to prevent problem later.
mangled_name = '** CFI jump table'
else:
# E.g., '(.text.unlikely._name)' -> '_name'.
mangled_name = paren_value[mangled_start_idx:-1]
cur_flags = _FlagsFromMangledName(mangled_name)
is_partial = True
# As of 2017/11 LLD does not distinguish merged strings from other
# merged data. Feature request is filed under:
# https://bugs.llvm.org/show_bug.cgi?id=35248
if cur_obj == '<internal>':
if cur_section == '.rodata' and mangled_name == '':
# Treat all <internal> sections within .rodata as as string
# literals. Some may hold numeric constants or other data, but
# there is currently no way to distinguish them.
mangled_name = '** lld merge strings'
else:
# e.g. <internal>:(.text.thunk)
mangled_name = '** ' + mangled_name
is_partial = False
cur_obj = None
elif cur_obj == 'lto.tmp' or 'thinlto-cache' in cur_obj:
thin_map[address] = os.path.basename(cur_obj)
cur_obj = None
# Create a symbol here since there may be no ensuing Level 3 lines.
# But if there are, then the symbol can be modified later as sym[-1].
sym = models.Symbol(cur_section, size, address=address,
full_name=mangled_name, object_path=cur_obj,
flags=cur_flags)
syms.append(sym)
# Level 3 |address| is nested under Level 2, don't add |size|.
next_usable_address = address
# Level 3 data match the "Symbol" column. They specify symbol names or
# special names such as '.L_MergeGlobals'. Annotations such as '$d',
# '$t.42' also appear at Level 3, but they are consumed by |tokenizer|,
# so don't appear hear.
elif level == 3:
# Handle .L.cfi.jumptable.
if in_jump_table:
# Level 3 entries in CFI jump tables are thunks with mangled names.
# Extracting them as symbols is not worthwhile; we only store the
# Level 2 symbol, and print the count for verbose output. For
# counting, '__typeid_' entries are excluded since they're likely
# just annotations.
if not tok.startswith('__typeid_'):
jump_entries_count += 1
continue
# Ignore anything with '.L_MergedGlobals' prefix. This seems to only
# happen for ARM (32-bit) builds.
if tok.startswith('.L_MergedGlobals'):
continue
# Use |span| to decide whether to use a Level 3 line for Symbols. This
# is useful for two purposes:
# * This is a better indicator than |size|, which can be 0 for
# assembly functions.
# * If multiple Level 3 lines have the same starting address, this
# cause all but the last line to have |span > 0|. This dedups lines
# with identical symbol names (why do they exist?). Note that this
# also skips legitimate aliases, but that's desired because nm.py
# (downstream) assumes no aliases already exist.
if span > 0:
stripped_tok = demangle.StripLlvmPromotedGlobalNames(tok)
if len(tok) != len(stripped_tok):
promoted_name_count += 1
tok = stripped_tok
tok = _NormalizeName(tok)
# Handle special case where a partial symbol consumes bytes before
# the first Level 3 symbol.
if is_partial and syms[-1].address < address:
# Truncate the partial symbol and leave it without |full_name|.
# The data from the current line will form a new symbol.
syms[-1].size = address - syms[-1].address
next_usable_address = address
is_partial = False
if is_partial:
syms[-1].full_name = tok
syms[-1].size = size if size > 0 else min(syms[-1].size, span)
next_usable_address = address + syms[-1].size
is_partial = False
elif address >= next_usable_address:
if tok.startswith('__typeid_'):
assert size == 1
if tok.endswith('_byte_array'):
# CFI byte array table: |size| is inaccurate, so use |span|.
size_to_use = span
else:
# Likely '_global_addr' or '_unique_member'. These should be:
# * Skipped since they're in CFI tables.
# * Suppressed (via |next_usable_address|) by another Level 3
# symbol.
# Anything that makes it here would be an anomaly worthy of
# investigation, so print warnings.
logging.warn('Unrecognized __typeid_ symbol at %08X', address)
continue
else:
# Prefer |size|, and only fall back to |span| if |size == 0|.
size_to_use = size if size > 0 else span
sym = models.Symbol(cur_section, size_to_use, address=address,
full_name=tok, flags=cur_flags)
syms.append(sym)
# Suppress symbols with overlapping |address|. This eliminates
# labels from assembly sources.
next_usable_address = address + size_to_use
if cur_obj is not None:
syms[-1].object_path = cur_obj
else:
logging.error('Problem line: %r', line)
if promoted_name_count:
logging.info('Found %d promoted global names', promoted_name_count)
if jump_tables_count:
logging.info('Found %d CFI jump tables with %d total entries',
jump_tables_count, jump_entries_count)
return self._section_ranges, syms, {'thin_map': thin_map}
def Parse(self, lines):
"""Parses a linker map file.
Args:
lines: Iterable of lines, the first of which has been consumed to
identify file type.
Returns:
A tuple of (section_sizes, symbols).
"""
# Newest format:
# VMA LMA Size Align Out In Symbol
# 194 194 13 1 .interp
# 194 194 13 1 <internal>:(.interp)
# 1a8 1a8 22d8 4 .ARM.exidx
# 1b0 1b0 8 4 obj/sandbox/syscall.o:(.ARM.exidx)
# 400 400 123400 64 .text
# 600 600 14 4 obj/...:(.text.OUTLINED_FUNCTION_0)
# 600 600 0 1 $x.3
# 600 600 14 1 OUTLINED_FUNCTION_0
# 123800 123800 20000 256 .rodata
# 123800 123800 4 4 ...:o:(.rodata._ZN3fooE.llvm.1234)
# 123800 123800 4 1 foo (.llvm.1234)
# 123804 123804 4 4 ...:o:(.rodata.bar.llvm.1234)
# 123804 123804 4 1 bar.llvm.1234
# Older format:
# Address Size Align Out In Symbol
# 00000000002002a8 000000000000001c 1 .interp
# 00000000002002a8 000000000000001c 1 <internal>:(.interp)
# ...
# 0000000000201000 0000000000000202 16 .text
# 0000000000201000 000000000000002a 1 /[...]/crt1.o:(.text)
# 0000000000201000 0000000000000000 0 _start
# 000000000020102a 0000000000000000 1 /[...]/crti.o:(.text)
# 0000000000201030 00000000000000bd 16 /[...]/crtbegin.o:(.text)
# 0000000000201030 0000000000000000 0 deregister_tm_clones
# 0000000000201060 0000000000000000 0 register_tm_clones
# 00000000002010a0 0000000000000000 0 __do_global_dtors_aux
# 00000000002010c0 0000000000000000 0 frame_dummy
# 00000000002010ed 0000000000000071 1 a.o:(.text)
# 00000000002010ed 0000000000000071 0 main
# Extract e.g., 'lld_v0' -> 0, or 'lld-lto_v1' -> 1.
map_file_version = int(self._linker_name.split('_v')[1])
pattern = MapFileParserLld._LINE_RE[map_file_version]
syms = []
cur_section = None
cur_section_is_useful = None
promoted_name_count = 0
for line in lines:
m = pattern.match(line)
if m is None:
continue
address = int(m.group(1), 16)
size = int(m.group(2), 16)
indent_size = len(m.group(4))
tok = m.group(5)
if indent_size == 0:
if not tok.startswith('PROVIDE_HIDDEN'):
self._section_sizes[tok] = size
cur_section = tok
# E.g., Want to convert "(.text._name)" -> "_name" later.
mangled_start_idx = len(cur_section) + 2
cur_section_is_useful = (
cur_section in (models.SECTION_BSS,
models.SECTION_RODATA,
models.SECTION_TEXT) or
cur_section.startswith(models.SECTION_DATA))
elif cur_section_is_useful:
if indent_size == 8:
# Create preliminary Symbol, which can be modified as sym[-1].
syms.append(models.Symbol(cur_section, size, address=address))
# E.g. path.o:(.text._name)
cur_obj, paren_value = tok.split(':')
# "(.text._name)" -> "_name".
mangled_name = paren_value[mangled_start_idx:-1]
# As of 2017/11 LLD does not distinguish merged strings from other
# merged data. Feature request is filed under:
# https://bugs.llvm.org/show_bug.cgi?id=35248
if cur_obj == '<internal>':
if cur_section == '.rodata' and mangled_name == '':
# Treat all <internal> sections within .rodata as as string
# literals. Some may hold numeric constants or other data, but
# there is currently no way to distinguish them.
syms[-1].full_name = '** lld merge strings'
else:
# e.g. <internal>:(.text.thunk)
syms[-1].full_name = '** ' + mangled_name
elif cur_obj == 'lto.tmp' or 'thinlto-cache' in cur_obj:
pass
else:
syms[-1].object_path = cur_obj
elif indent_size == 16:
# Ignore anything with '.L_MergedGlobals' prefix. This seems to only
# happen for ARM (32-bit) builds.
if tok.startswith('.L_MergedGlobals'):
continue
# If multiple entries exist, take the first on that reports a size.
# Zero-length symbols look like "$t.4", "$d.5".
if size and not syms[-1].full_name:
# Outlined functions have names like OUTLINED_FUNCTION_0, which can
# appear 1000+ time that can cause false aliasing. We treat these as
# special cases by designating them as a placeholder symbols and
# renaming them to '** outlined function'.
if tok.startswith('OUTLINED_FUNCTION_'):
tok = '** outlined function'
stripped_tok = demangle.StripLlvmPromotedGlobalNames(tok)
if len(tok) != len(stripped_tok):
promoted_name_count += 1
tok = stripped_tok
syms[-1].full_name = tok
else:
logging.error('Problem line: %r', line)
if promoted_name_count:
logging.info('Found %d promoted global names', promoted_name_count)
return self._section_sizes, syms
def Parse(self, lines):
"""Parses a linker map file.
Args:
lines: Iterable of lines, the first of which has been consumed to
identify file type.
Returns:
A tuple of (section_sizes, symbols).
"""
# Newest format:
# VMA LMA Size Align Out In Symbol
# 194 194 13 1 .interp
# 194 194 13 1 <internal>:(.interp)
# 1a8 1a8 22d8 4 .ARM.exidx
# 1b0 1b0 8 4 obj/sandbox/syscall.o:(.ARM.exidx)
# 400 400 123400 64 .text
# 600 600 14 4 obj/...:(.text.OUTLINED_FUNCTION_0)
# 600 600 0 1 $x.3
# 600 600 14 1 OUTLINED_FUNCTION_0
# 123800 123800 20000 256 .rodata
# 123800 123800 4 4 ...:o:(.rodata._ZN3fooE.llvm.1234)
# 123800 123800 4 1 foo (.llvm.1234)
# 123804 123804 4 4 ...:o:(.rodata.bar.llvm.1234)
# 123804 123804 4 1 bar.llvm.1234
# Older format:
# Address Size Align Out In Symbol
# 00000000002002a8 000000000000001c 1 .interp
# 00000000002002a8 000000000000001c 1 <internal>:(.interp)
# ...
# 0000000000201000 0000000000000202 16 .text
# 0000000000201000 000000000000002a 1 /[...]/crt1.o:(.text)
# 0000000000201000 0000000000000000 0 _start
# 000000000020102a 0000000000000000 1 /[...]/crti.o:(.text)
# 0000000000201030 00000000000000bd 16 /[...]/crtbegin.o:(.text)
# 0000000000201030 0000000000000000 0 deregister_tm_clones
# 0000000000201060 0000000000000000 0 register_tm_clones
# 00000000002010a0 0000000000000000 0 __do_global_dtors_aux
# 00000000002010c0 0000000000000000 0 frame_dummy
# 00000000002010ed 0000000000000071 1 a.o:(.text)
# 00000000002010ed 0000000000000071 0 main
syms = []
cur_section = None
cur_section_is_useful = None
promoted_name_count = 0
# A Level 2 line does not supply |full_name| data (unless '<internal>').
# This would be taken from a Level 3 line. |is_partial| indicates that an
# eligible Level 3 line should be used to update |syms[-1].full_name|
# instead of creating a new symbol.
is_partial = False
# Assembly code can create consecutive Level 3 lines with |size == 0|. These
# lines can represent
# (1) assembly functions (should form symbol), or
# (2) assembly labels (should NOT form symbol).
# It seems (2) correlates with the presence of a leading Level 3 line with
# |size > 0|. This gives rise to the following strategy: Each symbol S from
# a Level 3 line suppresses Level 3 lines with |address| less than
# |next_usable_address := S.address + S.size|.
next_usable_address = 0
tokenizer = self.Tokenize(lines)
for (line, address, size, level, span, tok) in tokenizer:
# Level 1 data match the "Out" column. They specify sections or
# PROVIDE_HIDDEN lines.
if level == 1:
if not tok.startswith('PROVIDE_HIDDEN'):
self._section_sizes[tok] = size
cur_section = tok
# E.g., Want to convert "(.text._name)" -> "_name" later.
mangled_start_idx = len(cur_section) + 2
cur_section_is_useful = (
cur_section in (models.SECTION_BSS,
models.SECTION_RODATA,
models.SECTION_TEXT) or
cur_section.startswith(models.SECTION_DATA))
elif cur_section_is_useful:
# Level 2 data match the "In" column. They specify object paths and
# section names within objects, or '<internal>:...'.
if level == 2:
# Create a symbol here since there may be no ensuing Level 3 lines.
# But if there are, then the symbol can be modified later as sym[-1].
syms.append(models.Symbol(cur_section, size, address=address))
# E.g., 'path.o:(.text._name)' => ['path.o', '(.text._name)'].
cur_obj, paren_value = tok.split(':')
# E.g., '(.text._name)' -> '_name'.
mangled_name = paren_value[mangled_start_idx:-1]
# As of 2017/11 LLD does not distinguish merged strings from other
# merged data. Feature request is filed under:
# https://bugs.llvm.org/show_bug.cgi?id=35248
if cur_obj == '<internal>':
if cur_section == '.rodata' and mangled_name == '':
# Treat all <internal> sections within .rodata as as string
# literals. Some may hold numeric constants or other data, but
# there is currently no way to distinguish them.
syms[-1].full_name = '** lld merge strings'
else:
# e.g. <internal>:(.text.thunk)
syms[-1].full_name = '** ' + mangled_name
cur_obj = None
elif cur_obj == 'lto.tmp' or 'thinlto-cache' in cur_obj:
cur_obj = None
if cur_obj is not None:
syms[-1].object_path = cur_obj
is_partial = not bool(syms[-1].full_name)
# Level 3 |address| is nested under Level 2, don't add |size|.
next_usable_address = address
# Level 3 data match the "Symbol" column. They specify symbol names or
# special names such as '.L_MergeGlobals'. Annotations such as '$d',
# '$t.42' also appear at Level 3, but they are consumed by |tokenizer|,
# so don't appear hear.
elif level == 3:
# Ignore anything with '.L_MergedGlobals' prefix. This seems to only
# happen for ARM (32-bit) builds.
if tok.startswith('.L_MergedGlobals'):
continue
# Use |span| to decide whether to use a Level 3 line for Symbols. This
# is useful for two purposes:
# * This is a better indicator than |size|, which can be 0 for
# assembly functions.
# * If multiple Level 3 lines have the same starting address, this
# cause all but the last line to have |span > 0|. This dedups lines
# with identical symbol names (why do they exist?). Note that this
# also skips legitimate aliases, but that's desired because nm.py
# (downstream) assumes no aliases already exist.
if span > 0:
# Outlined functions have names like OUTLINED_FUNCTION_0, which can
# appear 1000+ time, and can cause false aliasing. We treat these as
# special cases by designating them as a placeholder symbols and
# renaming them to '** outlined function'.
if tok.startswith('OUTLINED_FUNCTION_'):
tok = '** outlined function'
stripped_tok = demangle.StripLlvmPromotedGlobalNames(tok)
if len(tok) != len(stripped_tok):
promoted_name_count += 1
tok = stripped_tok
# Handle special case where a partial symbol consumes bytes before
# the first Level 3 symbol.
if is_partial and syms[-1].address < address:
# Truncate the partial symbol and leave it without |full_name|.
# The data from the current line will form a new symbol.
syms[-1].size = address - syms[-1].address
next_usable_address = address
is_partial = False
if is_partial:
syms[-1].full_name = tok
syms[-1].size = size if size > 0 else min(syms[-1].size, span)
next_usable_address = address + syms[-1].size
is_partial = False
elif address >= next_usable_address:
# Prefer |size|, and only fall back to |span| if |size == 0|.
size_to_use = size if size > 0 else span
syms.append(
models.Symbol(
cur_section, size_to_use, address=address, full_name=tok))
# Suppress symbols with overlapping |address|. This eliminates
# labels from assembly sources.
next_usable_address = address + size_to_use
if cur_obj is not None:
syms[-1].object_path = cur_obj
else:
logging.error('Problem line: %r', line)
if promoted_name_count:
logging.info('Found %d promoted global names', promoted_name_count)
return self._section_sizes, syms
def Parse(self, lines):
"""Parses a linker map file.
Args:
lines: Iterable of lines, the first of which has been consumed to
identify file type.
Returns:
A tuple of (section_sizes, symbols).
"""
# Newest format:
# VMA LMA Size Align Out In Symbol
# 194 194 13 1 .interp
# 194 194 13 1 <internal>:(.interp)
# 1a8 1a8 22d8 4 .ARM.exidx
# 1b0 1b0 8 4 obj/sandbox/syscall.o:(.ARM.exidx)
# 400 400 123400 64 .text
# 600 600 14 4 obj/...:(.text.OUTLINED_FUNCTION_0)
# 600 600 0 1 $x.3
# 600 600 14 1 OUTLINED_FUNCTION_0
# 123800 123800 20000 256 .rodata
# 123800 123800 4 4 ...:o:(.rodata._ZN3fooE.llvm.1234)
# 123800 123800 4 1 foo (.llvm.1234)
# 123804 123804 4 4 ...:o:(.rodata.bar.llvm.1234)
# 123804 123804 4 1 bar.llvm.1234
# Older format:
# Address Size Align Out In Symbol
# 00000000002002a8 000000000000001c 1 .interp
# 00000000002002a8 000000000000001c 1 <internal>:(.interp)
# ...
# 0000000000201000 0000000000000202 16 .text
# 0000000000201000 000000000000002a 1 /[...]/crt1.o:(.text)
# 0000000000201000 0000000000000000 0 _start
# 000000000020102a 0000000000000000 1 /[...]/crti.o:(.text)
# 0000000000201030 00000000000000bd 16 /[...]/crtbegin.o:(.text)
# 0000000000201030 0000000000000000 0 deregister_tm_clones
# 0000000000201060 0000000000000000 0 register_tm_clones
# 00000000002010a0 0000000000000000 0 __do_global_dtors_aux
# 00000000002010c0 0000000000000000 0 frame_dummy
# 00000000002010ed 0000000000000071 1 a.o:(.text)
# 00000000002010ed 0000000000000071 0 main
syms = []
cur_section = None
cur_section_is_useful = None
promoted_name_count = 0
tokenizer = self.Tokenize(lines)
# TODO(huangs): Use |span| from |tokenizer| to fix http://crbug.com/892648.
for (line, address, size, level, _, tok) in tokenizer:
# Level 1 data match the "Out" column. They specify sections or
# PROVIDE_HIDDEN lines.
if level == 1:
if not tok.startswith('PROVIDE_HIDDEN'):
self._section_sizes[tok] = size
cur_section = tok
# E.g., Want to convert "(.text._name)" -> "_name" later.
mangled_start_idx = len(cur_section) + 2
cur_section_is_useful = (
cur_section in (models.SECTION_BSS, models.SECTION_RODATA,
models.SECTION_TEXT)
or cur_section.startswith(models.SECTION_DATA))
elif cur_section_is_useful:
# Level 2 data match the "In" column. They specify object paths and
# section names within objects, or '<internal>:...'.
if level == 2:
# Create symbol, which can be modified as sym[-1] by Level 3 parsing.
syms.append(
models.Symbol(cur_section, size, address=address))
# E.g. path.o:(.text._name)
cur_obj, paren_value = tok.split(':')
# '(.text._name)' -> '_name'.
mangled_name = paren_value[mangled_start_idx:-1]
# As of 2017/11 LLD does not distinguish merged strings from other
# merged data. Feature request is filed under:
# https://bugs.llvm.org/show_bug.cgi?id=35248
if cur_obj == '<internal>':
if cur_section == '.rodata' and mangled_name == '':
# Treat all <internal> sections within .rodata as as string
# literals. Some may hold numeric constants or other data, but
# there is currently no way to distinguish them.
syms[-1].full_name = '** lld merge strings'
else:
# e.g. <internal>:(.text.thunk)
syms[-1].full_name = '** ' + mangled_name
elif cur_obj == 'lto.tmp' or 'thinlto-cache' in cur_obj:
pass
else:
syms[-1].object_path = cur_obj
# Level 3 data match the "Symbol" column. They specify symbol names or
# special names such as '.L_MergeGlobals'. Annotations such as '$d',
# '$t.42' also appear at Level 3, but they are consumed by |tokenizer|,
# so don't appear hear.
elif level == 3:
# Ignore anything with '.L_MergedGlobals' prefix. This seems to only
# happen for ARM (32-bit) builds.
if tok.startswith('.L_MergedGlobals'):
continue
# Multiple Level 3 entries may exist. Take the first with |size != 0|.
# TODO(huangs): Process all entries to fix http://crbug.com/892648.
if size and not syms[-1].full_name:
# Outlined functions have names like OUTLINED_FUNCTION_0, which can
# appear 1000+ time, and can cause false aliasing. We treat these as
# special cases by designating them as a placeholder symbols and
# renaming them to '** outlined function'.
if tok.startswith('OUTLINED_FUNCTION_'):
tok = '** outlined function'
stripped_tok = demangle.StripLlvmPromotedGlobalNames(
tok)
if len(tok) != len(stripped_tok):
promoted_name_count += 1
tok = stripped_tok
syms[-1].full_name = tok
else:
logging.error('Problem line: %r', line)
if promoted_name_count:
logging.info('Found %d promoted global names', promoted_name_count)
return self._section_sizes, syms