Re-land [lldb-dap] Add support for data breakpoint. (#81909)

This implements functionality to handle DataBreakpointInfo request and
SetDataBreakpoints request.

Previous commit
https://github.com/llvm/llvm-project/commit/8c56e78ec531f0e2460213c20fff869b6b7add99
was reverted because setting 1 byte watchpoint failed in the new test on
ARM64. So, I changed the test to setting 4 byte watchpoint instead, and
hope this won't break it again. It also adds the fixes from
https://github.com/llvm/llvm-project/pull/81680.

1 files changed, 47 insertions, 0 deletions

diff --git a/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/dap_server.py b/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/dap_server.py
index bb863bb..27a76a6 100644
--- a/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/dap_server.py
+++ b/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/dap_server.py
@@ -501,6 +501,18 @@ class DebugCommunication(object):
             return variable["value"]
         return None
 
+    def get_local_variable_child(self, name, child_name, frameIndex=0, threadId=None):
+        local = self.get_local_variable(name, frameIndex, threadId)
+        if local["variablesReference"] == 0:
+            return None
+        children = self.request_variables(local["variablesReference"])["body"][
+            "variables"
+        ]
+        for child in children:
+            if child["name"] == child_name:
+                return child
+        return None
+
     def replay_packets(self, replay_file_path):
         f = open(replay_file_path, "r")
         mode = "invalid"
@@ -895,6 +907,41 @@ class DebugCommunication(object):
         }
         return self.send_recv(command_dict)
 
+    def request_dataBreakpointInfo(
+        self, variablesReference, name, frameIndex=0, threadId=None
+    ):
+        stackFrame = self.get_stackFrame(frameIndex=frameIndex, threadId=threadId)
+        if stackFrame is None:
+            return []
+        args_dict = {
+            "variablesReference": variablesReference,
+            "name": name,
+            "frameId": stackFrame["id"],
+        }
+        command_dict = {
+            "command": "dataBreakpointInfo",
+            "type": "request",
+            "arguments": args_dict,
+        }
+        return self.send_recv(command_dict)
+
+    def request_setDataBreakpoint(self, dataBreakpoints):
+        """dataBreakpoints is a list of dictionary with following fields:
+        {
+            dataId: (address in hex)/(size in bytes)
+            accessType: read/write/readWrite
+            [condition]: string
+            [hitCondition]: string
+        }
+        """
+        args_dict = {"breakpoints": dataBreakpoints}
+        command_dict = {
+            "command": "setDataBreakpoints",
+            "type": "request",
+            "arguments": args_dict,
+        }
+        return self.send_recv(command_dict)
+
     def request_compileUnits(self, moduleId):
         args_dict = {"moduleId": moduleId}
         command_dict = {