1 files changed, 128 insertions, 0 deletions
diff --git a/chromium/buildtools/third_party/libc++/trunk/utils/sym_check/sym_check/util.py b/chromium/buildtools/third_party/libc++/trunk/utils/sym_check/sym_check/util.py
new file mode 100644
index 00000000000..1d3b424f6f3
--- /dev/null
+++ b/chromium/buildtools/third_party/libc++/trunk/utils/sym_check/sym_check/util.py
@@ -0,0 +1,128 @@
+import ast
+import distutils.spawn
+import signal
+import subprocess
+import sys
+
+
+def execute_command(cmd, input_str=None):
+    """
+    Execute a command, capture and return its output.
+    """
+    kwargs = {
+        'stdin': subprocess.PIPE,
+        'stdout': subprocess.PIPE,
+        'stderr': subprocess.PIPE,
+    }
+    p = subprocess.Popen(cmd, **kwargs)
+    out, err = p.communicate(input=input_str)
+    exitCode = p.wait()
+    if exitCode == -signal.SIGINT:
+        raise KeyboardInterrupt
+    return out, err, exitCode
+
+
+def execute_command_verbose(cmd, input_str=None):
+    """
+    Execute a command and print its output on failure.
+    """
+    out, err, exitCode = execute_command(cmd, input_str=input_str)
+    if exitCode != 0:
+        report = "Command: %s\n" % ' '.join(["'%s'" % a for a in cmd])
+        report += "Exit Code: %d\n" % exitCode
+        if out:
+            report += "Standard Output:\n--\n%s--" % out
+        if err:
+            report += "Standard Error:\n--\n%s--" % err
+        report += "\n\nFailed!"
+        sys.stderr.write('%s\n' % report)
+    return out, err, exitCode
+
+
+def read_syms_from_list(slist):
+    """
+    Read a list of symbols from a list of strings.
+    Each string is one symbol.
+    """
+    return [ast.literal_eval(l) for l in slist]
+
+
+def read_syms_from_file(filename):
+    """
+    Read a list of symbols in from a file.
+    """
+    with open(filename, 'r') as f:
+        data = f.read()
+    return read_syms_from_list(data.splitlines())
+
+
+def read_blacklist(filename):
+    with open(filename, 'r') as f:
+        data = f.read()
+    lines = [l.strip() for l in data.splitlines() if l.strip()]
+    lines = [l for l in lines if not l.startswith('#')]
+    return lines
+
+
+def write_syms(sym_list, out=None, names_only=False):
+    """
+    Write a list of symbols to the file named by out.
+    """
+    out_str = ''
+    out_list = sym_list
+    if names_only:
+        out_list = [sym['name'] for sym in sym_list]
+        out_list.sort()
+    for sym in out_list:
+        out_str += '%s\n' % sym
+    if out is None:
+        sys.stdout.write(out_str)
+    else:
+        with open(out, 'w') as f:
+            f.write(out_str)
+
+
+_cppfilt_exe = distutils.spawn.find_executable('c++filt')
+
+
+def demangle_symbol(symbol):
+    if _cppfilt_exe is None:
+        return symbol
+    out, _, exit_code = execute_command_verbose(
+        [_cppfilt_exe], input_str=symbol)
+    if exit_code != 0:
+        return symbol
+    return out
+
+
+def is_elf(filename):
+    with open(filename, 'r') as f:
+        magic_bytes = f.read(4)
+    return magic_bytes == '\x7fELF'
+
+
+def is_mach_o(filename):
+    with open(filename, 'r') as f:
+        magic_bytes = f.read(4)
+    return magic_bytes in [
+        '\xfe\xed\xfa\xce',  # MH_MAGIC
+        '\xce\xfa\xed\xfe',  # MH_CIGAM
+        '\xfe\xed\xfa\xcf',  # MH_MAGIC_64
+        '\xcf\xfa\xed\xfe',  # MH_CIGAM_64
+        '\xca\xfe\xba\xbe',  # FAT_MAGIC
+        '\xbe\xba\xfe\xca'   # FAT_CIGAM
+    ]
+
+
+def is_library_file(filename):
+    if sys.platform == 'darwin':
+        return is_mach_o(filename)
+    else:
+        return is_elf(filename)
+
+
+def extract_or_load(filename):
+    import sym_check.extract
+    if is_library_file(filename):
+        return sym_check.extract.extract_symbols(filename)
+    return read_syms_from_file(filename)