[lldb/crashlog] Use raw strings to silence escape sequence warnings

This patch silences from escapte sequence warnings from the crashlog
script that were mostly due to regular expression strings.

This is addresses by using raw strings so the escape character isn't
interpreted by python and gets passed straight to the regular expression
engine.

Signed-off-by: Med Ismail Bennani <[email protected]>

Author: medismailben

lldb/examples/python/crashlog.py

@@ -296,7 +296,7 @@ class DarwinImage(symbolication.Image):
             except:
                 dsymForUUIDBinary = ""
 
-        dwarfdump_uuid_regex = re.compile("UUID: ([-0-9a-fA-F]+) \(([^\(]+)\) .*")
+        dwarfdump_uuid_regex = re.compile(r"UUID: ([-0-9a-fA-F]+) \(([^\(]+)\) .*")
 
         def __init__(
             self, text_addr_lo, text_addr_hi, identifier, version, uuid, path, verbose
@@ -501,7 +501,7 @@ def find_image_with_identifier(self, identifier):
         for image in self.images:
             if image.identifier == identifier:
                 return image
-        regex_text = "^.*\.%s$" % (re.escape(identifier))
+        regex_text = r"^.*\.%s$" % (re.escape(identifier))
         regex = re.compile(regex_text)
         for image in self.images:
             if regex.match(image.identifier):
@@ -925,7 +925,7 @@ def get(cls):
             version = r"(?:" + super().version + r"\s+)?"
             address = r"(0x[0-9a-fA-F]{4,})"  # 4 digits or more
 
-            symbol = """
+            symbol = r"""
                         (?:
                             [ ]+
                             (?P<symbol>.+)
@@ -1095,7 +1095,7 @@ def parse_normal(self, line):
             self.crashlog.process_identifier = line[11:].strip()
         elif line.startswith("Version:"):
             version_string = line[8:].strip()
-            matched_pair = re.search("(.+)\((.+)\)", version_string)
+            matched_pair = re.search(r"(.+)\((.+)\)", version_string)
             if matched_pair:
                 self.crashlog.process_version = matched_pair.group(1)
                 self.crashlog.process_compatability_version = matched_pair.group(2)

lldb/examples/python/symbolication.py

@@ -177,9 +177,9 @@ class Section:
     """Class that represents an load address range"""
 
     sect_info_regex = re.compile("(?P<name>[^=]+)=(?P<range>.*)")
-    addr_regex = re.compile("^\s*(?P<start>0x[0-9A-Fa-f]+)\s*$")
+    addr_regex = re.compile(r"^\s*(?P<start>0x[0-9A-Fa-f]+)\s*$")
     range_regex = re.compile(
-        "^\s*(?P<start>0x[0-9A-Fa-f]+)\s*(?P<op>[-+])\s*(?P<end>0x[0-9A-Fa-f]+)\s*$"
+        r"^\s*(?P<start>0x[0-9A-Fa-f]+)\s*(?P<op>[-+])\s*(?P<end>0x[0-9A-Fa-f]+)\s*$"
     )
 
     def __init__(self, start_addr=None, end_addr=None, name=None):
@@ -557,7 +557,7 @@ def find_images_with_identifier(self, identifier):
             if image.identifier == identifier:
                 images.append(image)
         if len(images) == 0:
-            regex_text = "^.*\.%s$" % (re.escape(identifier))
+            regex_text = r"^.*\.%s$" % (re.escape(identifier))
             regex = re.compile(regex_text)
             for image in self.images:
                 if regex.match(image.identifier):