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[lldb-dap] Improving 'variables' hover requests. #146773

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[lldb-dap] Improving 'variables' hover requests. #146773

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2 changes: 1 addition & 1 deletion lldb/test/API/tools/lldb-dap/memory/TestDAP_memory.py
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Original file line number Diff line number Diff line change
Expand Up @@ -92,7 +92,7 @@ def test_readMemory(self):
)
self.continue_to_next_stop()

ptr_deref = self.dap_server.request_evaluate("*rawptr")["body"]
ptr_deref = self.dap_server.request_evaluate("*rawptr", context="repl")["body"]
memref = ptr_deref["memoryReference"]

# We can read the complete string
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10 changes: 10 additions & 0 deletions lldb/tools/lldb-dap/Handler/EvaluateRequestHandler.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -181,7 +181,17 @@ void EvaluateRequestHandler::operator()(
expression = dap.last_nonempty_var_expression;
else
dap.last_nonempty_var_expression = expression;
} else {
// If this isn't a REPL context, trim leading pointer/reference characters
// to ensure we return the actual value of the expression.
Comment on lines +184 to +186
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doesn't this also trigger in way too many other contexts? E.g., also in the watch panel? I think in the watch panel a *x should actually dereference x

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@jimingham jimingham Jul 4, 2025 •
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Since people have to voluntarily put something in a watch panel, then in that case we should even run it as an expression. If somebody actually puts i++ in a watch window, presumably they meant for it to increment every time they stepped.
We had a silly bug in gdbtk way back in the day where we if you moused over a selection we would run the selection as an expression. But lots of people seem to select expressions so that they can focus on just the part they selected. As you can imagine, that went poorly.
The main thing - for me - is to always have running expressions be a distinct gesture.

// This can come up if you hover over a pointer or reference declaration
// like 'MyType *foo;' or `void fn(std::string &arg)`, which results in
// the hover request sending '*foo' or `&arg`. When we're not in the REPL,
// we should trim these characters to get to the actual variable, which
// should have the proper type encoded by the compiler.
expression = llvm::StringRef(expression).ltrim("*&").str();
}

// Always try to get the answer from the local variables if possible. If
// this fails, then if the context is not "hover", actually evaluate an
// expression using the expression parser.
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