vendor/lldb/lldb-trunk-r256945

1 files changed, 168 insertions, 0 deletions

diff --git a/examples/python/disasm-stress-test.py b/examples/python/disasm-stress-test.py
new file mode 100755
index 000000000000..5aa354dc24cb
--- /dev/null
+++ b/examples/python/disasm-stress-test.py
@@ -0,0 +1,168 @@
+#!/usr/bin/python
+
+import argparse, datetime, re, subprocess, sys, time
+
+parser = argparse.ArgumentParser(description="Run an exhaustive test of the LLDB disassembler for a specific architecture.")
+
+parser.add_argument('--arch', required=True, action='store', help='The architecture whose disassembler is to be tested')
+parser.add_argument('--bytes', required=True, action='store', type=int, help='The byte width of instructions for that architecture')
+parser.add_argument('--random', required=False, action='store_true', help='Enables non-sequential testing')
+parser.add_argument('--start', required=False, action='store', type=int, help='The first instruction value to test')
+parser.add_argument('--skip', required=False, action='store', type=int, help='The interval between instructions to test')
+parser.add_argument('--log', required=False, action='store', help='A log file to write the most recent instruction being tested')
+parser.add_argument('--time', required=False, action='store_true', help='Every 100,000 instructions, print an ETA to standard out')
+parser.add_argument('--lldb', required=False, action='store', help='The path to LLDB.framework, if LLDB should be overridden')
+
+arguments = sys.argv[1:]
+
+arg_ns = parser.parse_args(arguments)
+
+def AddLLDBToSysPathOnMacOSX():
+    def GetLLDBFrameworkPath():
+        lldb_path = subprocess.check_output(["xcrun", "-find", "lldb"])
+        re_result = re.match("(.*)/Developer/usr/bin/lldb", lldb_path)
+        if re_result == None:
+            return None
+        xcode_contents_path = re_result.group(1)
+        return xcode_contents_path + "/SharedFrameworks/LLDB.framework"
+    
+    lldb_framework_path = GetLLDBFrameworkPath()
+    
+    if lldb_framework_path == None:
+        print "Couldn't find LLDB.framework"
+        sys.exit(-1)
+    
+    sys.path.append(lldb_framework_path + "/Resources/Python")
+
+if arg_ns.lldb == None:
+    AddLLDBToSysPathOnMacOSX()
+else:
+    sys.path.append(arg_ns.lldb + "/Resources/Python")
+
+import lldb
+
+debugger = lldb.SBDebugger.Create()
+
+if debugger.IsValid() == False:
+    print "Couldn't create an SBDebugger"
+    sys.exit(-1)
+
+target = debugger.CreateTargetWithFileAndArch(None, arg_ns.arch)
+
+if target.IsValid() == False:
+    print "Couldn't create an SBTarget for architecture " + arg_ns.arch
+    sys.exit(-1)
+
+def ResetLogFile(log_file):
+    if log_file != sys.stdout:
+        log_file.seek(0)
+
+def PrintByteArray(log_file, byte_array):
+    for byte in byte_array:
+        print >>log_file, hex(byte) + " ",
+    print >>log_file
+    
+class SequentialInstructionProvider:
+    def __init__(self, byte_width, log_file, start=0, skip=1):
+        self.m_byte_width = byte_width
+        self.m_log_file = log_file
+        self.m_start = start
+        self.m_skip = skip
+        self.m_value = start
+        self.m_last = (1 << (byte_width * 8)) - 1
+    def PrintCurrentState(self, ret):
+        ResetLogFile(self.m_log_file)
+        print >>self.m_log_file, self.m_value
+        PrintByteArray(self.m_log_file, ret)
+    def GetNextInstruction(self):
+        if self.m_value > self.m_last:
+            return None
+        ret = bytearray(self.m_byte_width)
+        for i in range(self.m_byte_width):
+            ret[self.m_byte_width - (i + 1)] = (self.m_value >> (i * 8)) & 255 
+        self.PrintCurrentState(ret)
+        self.m_value += self.m_skip
+        return ret
+    def GetNumInstructions(self):
+        return (self.m_last - self.m_start) / self.m_skip
+    def __iter__(self):
+        return self
+    def next(self):
+        ret = self.GetNextInstruction()
+        if ret == None:
+            raise StopIteration
+        return ret
+
+class RandomInstructionProvider:
+    def __init__(self, byte_width, log_file):
+        self.m_byte_width = byte_width
+        self.m_log_file = log_file
+        self.m_random_file = open("/dev/random", 'r')
+    def PrintCurrentState(self, ret):
+        ResetLogFile(self.m_log_file)
+        PrintByteArray(self.m_log_file, ret)
+    def GetNextInstruction(self):
+        ret = bytearray(self.m_byte_width)
+        for i in range(self.m_byte_width):
+            ret[i] = self.m_random_file.read(1)
+        self.PrintCurrentState(ret)
+        return ret
+    def __iter__(self):
+        return self
+    def next(self):
+        ret = self.GetNextInstruction()
+        if ret == None:
+            raise StopIteration
+        return ret
+
+log_file = None
+
+def GetProviderWithArguments(args):
+    global log_file
+    if args.log != None:
+        log_file = open(args.log, 'w')
+    else:
+        log_file = sys.stdout
+    instruction_provider = None
+    if args.random == True:
+        instruction_provider = RandomInstructionProvider(args.bytes, log_file)
+    else:
+        start = 0
+        skip = 1
+        if args.start != None:
+            start = args.start
+        if args.skip != None:
+            skip = args.skip
+        instruction_provider = SequentialInstructionProvider(args.bytes, log_file, start, skip)
+    return instruction_provider
+
+instruction_provider = GetProviderWithArguments(arg_ns)
+
+fake_address = lldb.SBAddress()
+
+actually_time = arg_ns.time and not arg_ns.random
+
+if actually_time:
+    num_instructions_logged = 0
+    total_num_instructions = instruction_provider.GetNumInstructions()
+    start_time = time.time()
+
+for inst_bytes in instruction_provider:
+    if actually_time:
+        if (num_instructions_logged != 0) and (num_instructions_logged % 100000 == 0):
+            curr_time = time.time()
+            elapsed_time = curr_time - start_time
+            remaining_time = float(total_num_instructions - num_instructions_logged) * (float(elapsed_time) / float(num_instructions_logged))
+            print str(datetime.timedelta(seconds=remaining_time))
+        num_instructions_logged = num_instructions_logged + 1
+    inst_list = target.GetInstructions(fake_address, inst_bytes)
+    if not inst_list.IsValid():
+        print >>log_file, "Invalid instruction list"
+        continue
+    inst = inst_list.GetInstructionAtIndex(0)
+    if not inst.IsValid():
+        print >>log_file, "Invalid instruction"
+        continue
+    instr_output_stream = lldb.SBStream()
+    inst.GetDescription(instr_output_stream)
+    print >>log_file, instr_output_stream.GetData()