[binutils-gdb] Implement DAP setExpression request

[Tom Tromey]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=c2a0d767db1637d1651b80bc885903cacd637107

commit c2a0d767db1637d1651b80bc885903cacd637107
Author: Tom Tromey <tromey@adacore.com>
Date:   Tue May 16 07:14:22 2023 -0600

    Implement DAP setExpression request
    
    This implements the DAP setExpression request.

Diff:
---
 gdb/python/lib/gdb/dap/evaluate.py  | 24 +++++++++++++++++++++++-
 gdb/testsuite/gdb.dap/basic-dap.exp |  5 +++++
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/gdb/python/lib/gdb/dap/evaluate.py b/gdb/python/lib/gdb/dap/evaluate.py
index 4fc0f31486c..1db6962f8e0 100644
--- a/gdb/python/lib/gdb/dap/evaluate.py
+++ b/gdb/python/lib/gdb/dap/evaluate.py
@@ -20,7 +20,7 @@ import gdb.printing
 from typing import Optional
 
 from .frames import frame_for_id
-from .server import request
+from .server import capability, request
 from .startup import send_gdb_with_response, in_gdb_thread
 from .varref import find_variable, VariableReference
 
@@ -43,6 +43,20 @@ def _evaluate(expr, frame_id):
     return ref.to_object()
 
 
+# Helper function to perform an assignment.
+@in_gdb_thread
+def _set_expression(expression, value, frame_id):
+    global_context = True
+    if frame_id is not None:
+        frame = frame_for_id(frame_id)
+        frame.select()
+        global_context = False
+    lhs = gdb.parse_and_eval(expression, global_context=global_context)
+    rhs = gdb.parse_and_eval(value, global_context=global_context)
+    lhs.assign(rhs)
+    return EvaluateResult(lhs).to_object()
+
+
 # Helper function to evaluate a gdb command in a certain frame.
 @in_gdb_thread
 def _repl(command, frame_id):
@@ -89,3 +103,11 @@ def variables(*, variablesReference: int, start: int = 0, count: int = 0, **args
         lambda: _variables(variablesReference, start, count)
     )
     return {"variables": result}
+
+
+@capability("supportsSetExpression")
+@request("setExpression")
+def set_expression(
+    *, expression: str, value: str, frameId: Optional[int] = None, **args
+):
+    return send_gdb_with_response(lambda: _set_expression(expression, value, frameId))
diff --git a/gdb/testsuite/gdb.dap/basic-dap.exp b/gdb/testsuite/gdb.dap/basic-dap.exp
index ce739875404..9aaa94051e6 100644
--- a/gdb/testsuite/gdb.dap/basic-dap.exp
+++ b/gdb/testsuite/gdb.dap/basic-dap.exp
@@ -159,6 +159,11 @@ set obj [dap_check_request_and_response "evaluate global in main" \
 dap_match_values "global value in main" [lindex $obj 0] \
     "body result" 25
 
+set obj [dap_check_request_and_response "set global in main" \
+	     setExpression {o expression [s global_variable] value [s 23]}]
+dap_match_values "global value in main after set" [lindex $obj 0] \
+    "body result" 23
+
 set obj [dap_request_and_response \
 	     evaluate {o expression [s nosuchvariable]}]
 set response [lindex $obj 0]