Added gdb-remote auxv test for chunked reads.

Verifies that a sum of offset,length auxv reads
matches a single large read, and that the auxv data
extracted from them match.

llvm-svn: 211127

lldb/test/tools/lldb-gdbserver/TestGdbRemoteAuxvSupport.py

@@ -145,6 +145,54 @@ class TestGdbRemoteAuxvSupport(gdbremote_testcase.GdbRemoteTestCaseBase):
         self.set_inferior_startup_launch()
         self.auxv_keys_look_valid()
 
+    def auxv_chunked_reads_work(self):
+        # Verify that multiple smaller offset,length reads of auxv data
+        # return the same data as a single larger read.
+
+        # Grab the auxv data with a single large read here.
+        (word_size, auxv_data) = self.get_raw_auxv_data(inferior_args=["sleep:1"])
+        self.assertIsNotNone(auxv_data)
+
+        # Grab endian.
+        self.reset_test_sequence()
+        self.add_process_info_collection_packets()
+        context = self.expect_gdbremote_sequence()
+        self.assertIsNotNone(context)
+
+        process_info = self.parse_process_info_response(context)
+        self.assertIsNotNone(process_info)
+        endian = process_info.get("endian")
+        self.assertIsNotNone(endian)
+
+        auxv_dict = self.build_auxv_dict(endian, word_size, auxv_data)
+        self.assertIsNotNone(auxv_dict)
+
+        iterated_auxv_data = self.read_binary_data_in_chunks("qXfer:auxv:read::", 2*word_size)
+        self.assertIsNotNone(iterated_auxv_data)
+
+        auxv_dict_iterated = self.build_auxv_dict(endian, word_size, iterated_auxv_data)
+        self.assertIsNotNone(auxv_dict_iterated)
+
+        # Verify both types of data collection returned same content.
+        self.assertEquals(auxv_dict_iterated, auxv_dict)
+
+    @debugserver_test
+    @dsym_test
+    def test_auxv_chunked_reads_work_debugserver_dsym(self):
+        self.init_debugserver_test()
+        self.buildDsym()
+        self.set_inferior_startup_launch()
+        self.auxv_chunked_reads_work()
+
+    @llgs_test
+    @dwarf_test
+    @unittest2.expectedFailure()
+    def test_auxv_chunked_reads_work_llgs_dwarf(self):
+        self.init_llgs_test()
+        self.buildDwarf()
+        self.set_inferior_startup_launch()
+        self.auxv_chunked_reads_work()
+
 
 if __name__ == '__main__':
     unittest2.main()

lldb/test/tools/lldb-gdbserver/gdbremote_testcase.py

@@ -630,3 +630,37 @@ class GdbRemoteTestCaseBase(TestBase):
 
         self.fail("should not reach here - implies required double zero entry not found")
         return auxv_dict
+
+    def read_binary_data_in_chunks(self, command_prefix, chunk_length):
+        """Collect command_prefix{offset:x},{chunk_length:x} until a single 'l' or 'l' with data is returned."""
+        offset = 0
+        done = False
+        decoded_data = ""
+
+        while not done:
+            # Grab the next iteration of data.
+            self.reset_test_sequence()
+            self.test_sequence.add_log_lines([
+                "read packet: ${}{:x},{:x}:#00".format(command_prefix, offset, chunk_length),
+                {"direction":"send", "regex":r"^\$([^E])(.*)#[0-9a-fA-F]{2}$", "capture":{1:"response_type", 2:"content_raw"} }
+                ], True)
+
+            context = self.expect_gdbremote_sequence()
+            self.assertIsNotNone(context)
+
+            response_type = context.get("response_type")
+            self.assertIsNotNone(response_type)
+            self.assertTrue(response_type in ["l", "m"])
+
+            # Move offset along.
+            offset += chunk_length
+
+            # Figure out if we're done.  We're done if the response type is l.
+            done = response_type == "l"
+
+            # Decode binary data.
+            content_raw = context.get("content_raw")
+            if content_raw and len(content_raw) > 0:
+                self.assertIsNotNone(content_raw)
+                decoded_data += self.decode_gdbremote_binary(content_raw)
+        return decoded_data