[lldb-dap] Incorrect value of evaluateName for vector registers

[DrSergei]

I found problem where "Add to Watch" doesn't work properly for vector registers (evaluateName is "Advanced Vector Extensionsymm0" instead of "$ymm0". I think the problem is inside LLDB. If I change GetPreferSyntheticValue() to false in SBValue.cpp:698, after that lldb-dap works fine. This suggests the problem is in the synthetic value logic

[DrSergei]

Problem with Add to Watch:

log file:

1751719655.021746874 (stdio) --> {"command":"initialize","arguments":{"clientID":"vscode","clientName":"Visual Studio Code","adapterID":"lldb-dap","pathFormat":"path","linesStartAt1":true,"columnsStartAt1":true,"supportsVariableType":true,"supportsVariablePaging":true,"supportsRunInTerminalRequest":true,"locale":"en","supportsProgressReporting":true,"supportsInvalidatedEvent":true,"supportsMemoryReferences":true,"supportsArgsCanBeInterpretedByShell":true,"supportsMemoryEvent":true,"supportsStartDebuggingRequest":true,"supportsANSIStyling":true},"type":"request","seq":1}
1751719655.025790215 (stdio) <-- {"body":{"$__lldb_version":"lldb version 21.0.0git (git@github.com:DrSergei/llvm-project.git revision 2fe0feb84875189478d8dd998cc992fa76562709)\n  clang revision 2fe0feb84875189478d8dd998cc992fa76562709\n  llvm revision 2fe0feb84875189478d8dd998cc992fa76562709","completionTriggerCharacters":["."," ","\t"],"exceptionBreakpointFilters":[{"description":"C++ Catch","filter":"cpp_catch","label":"C++ Catch","supportsCondition":true},{"description":"C++ Throw","filter":"cpp_throw","label":"C++ Throw","supportsCondition":true},{"description":"Objective-C Catch","filter":"objc_catch","label":"Objective-C Catch","supportsCondition":true},{"description":"Objective-C Throw","filter":"objc_throw","label":"Objective-C Throw","supportsCondition":true}],"supportTerminateDebuggee":true,"supportsBreakpointLocationsRequest":true,"supportsCancelRequest":true,"supportsCompletionsRequest":true,"supportsConditionalBreakpoints":true,"supportsConfigurationDoneRequest":true,"supportsDataBreakpoints":true,"supportsDelayedStackTraceLoading":true,"supportsDisassembleRequest":true,"supportsEvaluateForHovers":true,"supportsExceptionFilterOptions":true,"supportsExceptionInfoRequest":true,"supportsFunctionBreakpoints":true,"supportsHitConditionalBreakpoints":true,"supportsInstructionBreakpoints":true,"supportsLogPoints":true,"supportsModulesRequest":true,"supportsReadMemoryRequest":true,"supportsSetVariable":true,"supportsSteppingGranularity":true,"supportsValueFormattingOptions":true},"command":"initialize","request_seq":1,"seq":0,"success":true,"type":"response"}
1751719655.030165195 (stdio) --> {"command":"launch","arguments":{"type":"lldb-dap","request":"launch","name":"Launch (lldb-dap)","program":"/home/sergei/test/main.exe","args":[],"cwd":"/home/sergei/test","enableSyntheticChildDebugging":true,"__configurationTarget":6,"__sessionId":"39e84231-d8b5-4dad-a20d-469951c8e298"},"type":"request","seq":2}
1751719655.132615328 (stdio) <-- {"command":"launch","request_seq":2,"seq":0,"success":true,"type":"response"}
1751719655.132766962 (stdio) <-- {"body":{"module":{"addressRange":"0x7ffff7fc5000","debugInfoSize":"526.0KB","id":"1C8DB5F8-3BBA-514F-8FD5-F1FB6D7BE975-BE1BB855","name":"ld-linux-x86-64.so.2","path":"/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2","symbolFilePath":"/usr/lib/debug/.build-id/1c/8db5f83bba514f8fd5f1fb6d7be975be1bb855.debug","symbolStatus":"Symbols loaded."},"reason":"new"},"event":"module","seq":0,"type":"event"}
1751719655.132808685 (stdio) <-- {"event":"initialized","seq":0,"type":"event"}
1751719655.132853746 (stdio) <-- {"body":{"module":{"addressRange":"0x7ffff7fc3000","id":"276A2448-B2D5-2819-E052-4FB46CFC1168-4A23D111","name":"[vdso]","path":"[vdso]","symbolStatus":"Symbols not found."},"reason":"new"},"event":"module","seq":0,"type":"event"}
1751719655.132956266 (stdio) <-- {"body":{"module":{"addressRange":"0x555555554000","debugInfoSize":"725B","id":"EF51F15C-BFD8-FC78-7717-9F6D4A0D777B-EBB08E8A","name":"main.exe","path":"/home/sergei/test/main.exe","symbolFilePath":"/home/sergei/test/main.exe","symbolStatus":"Symbols loaded."},"reason":"new"},"event":"module","seq":0,"type":"event"}
1751719655.151196718 (stdio) --> {"command":"setBreakpoints","arguments":{"source":{"name":"main.cpp","path":"/home/sergei/test/main.cpp"},"lines":[3],"breakpoints":[{"line":3}],"sourceModified":false},"type":"request","seq":3}
1751719655.151467562 (stdio) --> {"command":"setFunctionBreakpoints","arguments":{"breakpoints":[]},"type":"request","seq":4}
1751719655.151529551 (stdio) --> {"command":"setInstructionBreakpoints","arguments":{"breakpoints":[]},"type":"request","seq":5}
1751719655.151552439 (stdio) --> {"command":"setExceptionBreakpoints","arguments":{"filters":[],"filterOptions":[]},"type":"request","seq":6}
1751719655.151572227 (stdio) --> {"command":"setDataBreakpoints","arguments":{"breakpoints":[]},"type":"request","seq":7}
1751719655.163194418 (stdio) <-- {"body":{"breakpoints":[{"column":12,"id":1,"instructionReference":"0x555555555138","line":3,"source":{"name":"main.cpp","path":"/home/sergei/test/main.cpp"},"verified":true}]},"command":"setBreakpoints","request_seq":3,"seq":0,"success":true,"type":"response"}
1751719655.163624048 (stdio) <-- {"body":{"breakpoint":{"column":12,"id":1,"instructionReference":"0x555555555138","line":3,"verified":true},"reason":"changed"},"event":"breakpoint","seq":0,"type":"event"}
1751719655.163720131 (stdio) <-- {"body":{"breakpoints":[]},"command":"setFunctionBreakpoints","request_seq":4,"seq":0,"success":true,"type":"response"}
1751719655.163793087 (stdio) <-- {"body":{"breakpoints":[]},"command":"setInstructionBreakpoints","request_seq":5,"seq":0,"success":true,"type":"response"}
1751719655.163952827 (stdio) <-- {"body":{},"command":"setExceptionBreakpoints","request_seq":6,"seq":0,"success":true,"type":"response"}
1751719655.164010286 (stdio) <-- {"body":{"breakpoints":[]},"command":"setDataBreakpoints","request_seq":7,"seq":0,"success":true,"type":"response"}
1751719655.225512028 (stdio) --> {"command":"breakpointLocations","arguments":{"source":{"name":"main.cpp","path":"/home/sergei/test/main.cpp"},"line":3},"type":"request","seq":8}
1751719655.226078272 (stdio) <-- {"body":{"breakpoints":[{"column":12,"line":3}]},"command":"breakpointLocations","request_seq":8,"seq":0,"success":true,"type":"response"}
1751719655.305855989 (stdio) --> {"command":"breakpointLocations","arguments":{"source":{"name":"main.cpp","path":"/home/sergei/test/main.cpp"},"line":3},"type":"request","seq":9}
1751719655.306462765 (stdio) --> {"command":"configurationDone","type":"request","seq":10}
1751719655.306972980 (stdio) <-- {"body":{"breakpoints":[{"column":12,"line":3}]},"command":"breakpointLocations","request_seq":9,"seq":0,"success":true,"type":"response"}
1751719655.307160378 (stdio) <-- {"body":{"capabilities":{"supportsRestartRequest":true,"supportsStepInTargetsRequest":true}},"event":"capabilities","seq":0,"type":"event"}
1751719655.307253599 (stdio) <-- {"body":{"isLocalProcess":true,"name":"/home/sergei/test/main.exe","startMethod":"launch","systemProcessId":429964},"event":"process","seq":0,"type":"event"}
1751719655.307780266 (stdio) <-- {"command":"configurationDone","request_seq":10,"seq":0,"success":true,"type":"response"}
1751719655.335533619 (stdio) --> {"command":"breakpointLocations","arguments":{"source":{"name":"main.cpp","path":"/home/sergei/test/main.cpp"},"line":3},"type":"request","seq":11}
1751719655.335880041 (stdio) --> {"command":"threads","type":"request","seq":12}
1751719655.336096525 (stdio) <-- {"body":{"breakpoints":[{"column":12,"line":3}]},"command":"breakpointLocations","request_seq":11,"seq":0,"success":true,"type":"response"}
1751719655.336287498 (stdio) <-- {"body":{"threads":[{"id":429964,"name":"main.exe"}]},"command":"threads","request_seq":12,"seq":0,"success":true,"type":"response"}
1751719655.577204227 (stdio) <-- {"body":{"module":{"addressRange":"0x7ffff7d9b000","debugInfoSize":"3.5MB","id":"42C84C92-E6F9-8126-B3E2-230EBFDEAD22-C235B667","name":"libc.so.6","path":"/lib/x86_64-linux-gnu/libc.so.6","symbolFilePath":"/usr/lib/debug/.build-id/42/c84c92e6f98126b3e2230ebfdead22c235b667.debug","symbolStatus":"Symbols loaded."},"reason":"new"},"event":"module","seq":0,"type":"event"}
1751719655.580996037 (stdio) <-- {"body":{"allThreadsStopped":true,"description":"breakpoint 1.1","hitBreakpointIds":[1],"preserveFocusHint":false,"reason":"breakpoint","threadCausedFocus":true,"threadId":429964},"event":"stopped","seq":0,"type":"event"}
1751719655.584840298 (stdio) --> {"command":"threads","type":"request","seq":13}
1751719655.585071087 (stdio) <-- {"body":{"threads":[{"id":429964,"name":"main.exe"}]},"command":"threads","request_seq":13,"seq":0,"success":true,"type":"response"}
1751719655.587719440 (stdio) --> {"command":"stackTrace","arguments":{"threadId":429964,"startFrame":0,"levels":1},"type":"request","seq":14}
1751719655.588059187 (stdio) <-- {"body":{"stackFrames":[{"column":12,"id":524288,"instructionPointerReference":"0x555555555138","line":3,"name":"f1()","source":{"name":"main.cpp","path":"/home/sergei/test/main.cpp"}}],"totalFrames":21},"command":"stackTrace","request_seq":14,"seq":0,"success":true,"type":"response"}
1751719655.629478216 (stdio) --> {"command":"breakpointLocations","arguments":{"source":{"name":"main.cpp","path":"/home/sergei/test/main.cpp"},"line":3},"type":"request","seq":15}
1751719655.630478382 (stdio) <-- {"body":{"breakpoints":[{"column":12,"line":3}]},"command":"breakpointLocations","request_seq":15,"seq":0,"success":true,"type":"response"}
1751719656.019517899 (stdio) --> {"command":"scopes","arguments":{"frameId":524288},"type":"request","seq":16}
1751719656.020116329 (stdio) <-- {"body":{"scopes":[{"expensive":false,"name":"Locals","namedVariables":1,"presentationHint":"locals","variablesReference":1},{"expensive":false,"name":"Globals","namedVariables":0,"variablesReference":2},{"expensive":false,"name":"Registers","namedVariables":3,"presentationHint":"registers","variablesReference":3}]},"command":"scopes","request_seq":16,"seq":0,"success":true,"type":"response"}
1751719656.028904438 (stdio) --> {"command":"variables","arguments":{"variablesReference":1},"type":"request","seq":17}
1751719656.030517340 (stdio) --> {"command":"stackTrace","arguments":{"threadId":429964,"startFrame":1,"levels":19},"type":"request","seq":18}
1751719656.068576336 (stdio) <-- {"body":{"variables":[{"$__lldb_extensions":{"declaration":{"column":9,"line":2,"path":"/home/sergei/test/main.cpp"},"value":"1"},"declarationLocationReference":8,"evaluateName":"a","id":4,"memoryReference":"0x7FFFFFFFDA6C","name":"a","type":"int","value":"1","variablesReference":0}]},"command":"variables","request_seq":17,"seq":0,"success":true,"type":"response"}
1751719656.076397896 (stdio) <-- {"body":{"stackFrames":[{"column":7,"id":524289,"instructionPointerReference":"0x555555555155","line":8,"name":"f2()","source":{"name":"main.cpp","path":"/home/sergei/test/main.cpp"}},{"column":7,"id":524290,"instructionPointerReference":"0x555555555172","line":14,"name":"f3()","source":{"name":"main.cpp","path":"/home/sergei/test/main.cpp"}},{"column":7,"id":524291,"instructionPointerReference":"0x555555555184","line":19,"name":"main","source":{"name":"main.cpp","path":"/home/sergei/test/main.cpp"}},{"column":16,"id":524292,"instructionPointerReference":"0x7FFFF7DC51CA","line":58,"name":"__libc_start_call_main","source":{"name":"libc_start_call_main.h","path":"sysdeps/nptl/libc_start_call_main.h"}},{"column":3,"id":524293,"instructionPointerReference":"0x7FFFF7DC528B","line":360,"name":"__libc_start_main_impl","source":{"name":"libc-start.c","path":"csu/libc-start.c"}},{"column":1,"id":524294,"instructionPointerReference":"0x555555555065","line":13,"name":"_start","source":{"name":"_start","path":"/home/sergei/test/main.exe`_start","presentationHint":"deemphasize","sourceReference":1}}],"totalFrames":7},"command":"stackTrace","request_seq":18,"seq":0,"success":true,"type":"response"}
1751719657.583294630 (stdio) --> {"command":"variables","arguments":{"variablesReference":3},"type":"request","seq":19}
1751719657.592503071 (stdio) <-- {"body":{"variables":[{"$__lldb_extensions":{},"evaluateName":"General Purpose Registers","id":5,"name":"General Purpose Registers","type":"<no-type>","value":"","variablesReference":5},{"$__lldb_extensions":{},"evaluateName":"Floating Point Registers","id":6,"name":"Floating Point Registers","type":"<no-type>","value":"","variablesReference":6},{"$__lldb_extensions":{},"evaluateName":"Advanced Vector Extensions","id":7,"name":"Advanced Vector Extensions","type":"<no-type>","value":"","variablesReference":7}]},"command":"variables","request_seq":19,"seq":0,"success":true,"type":"response"}
1751719658.760976553 (stdio) --> {"command":"variables","arguments":{"variablesReference":7},"type":"request","seq":20}
1751719658.779631853 (stdio) <-- {"body":{"variables":[{"$__lldb_extensions":{"summary":"(0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)"},"evaluateName":"Advanced Vector Extensionsymm0","id":8,"indexedVariables":33,"name":"ymm0","type":"unsigned char __attribute__((ext_vector_type(32)))","value":"(0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)","variablesReference":8},{"$__lldb_extensions":{"summary":"(0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)"},"evaluateName":"Advanced Vector Extensionsymm1","id":9,"indexedVariables":33,"name":"ymm1","type":"unsigned 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0x00, 0x00, 0x00)"},"evaluateName":"Advanced Vector Extensionsymm11","id":19,"indexedVariables":33,"name":"ymm11","type":"unsigned char __attribute__((ext_vector_type(32)))","value":"(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)","variablesReference":19},{"$__lldb_extensions":{"summary":"(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)"},"evaluateName":"Advanced Vector Extensionsymm12","id":20,"indexedVariables":33,"name":"ymm12","type":"unsigned char __attribute__((ext_vector_type(32)))","value":"(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)","variablesReference":20},{"$__lldb_extensions":{"summary":"(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)"},"evaluateName":"Advanced Vector Extensionsymm13","id":21,"indexedVariables":33,"name":"ymm13","type":"unsigned char __attribute__((ext_vector_type(32)))","value":"(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)","variablesReference":21},{"$__lldb_extensions":{"summary":"(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)"},"evaluateName":"Advanced Vector Extensionsymm14","id":22,"indexedVariables":33,"name":"ymm14","type":"unsigned char __attribute__((ext_vector_type(32)))","value":"(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)","variablesReference":22},{"$__lldb_extensions":{"summary":"(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)"},"evaluateName":"Advanced Vector Extensionsymm15","id":23,"indexedVariables":33,"name":"ymm15","type":"unsigned char __attribute__((ext_vector_type(32)))","value":"(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)","variablesReference":23}]},"command":"variables","request_seq":20,"seq":0,"success":true,"type":"response"}
1751719660.229324579 (stdio) --> {"command":"dataBreakpointInfo","arguments":{"name":"ymm0","variablesReference":7},"type":"request","seq":21}
1751719660.229845047 (stdio) <-- {"body":{"dataId":null,"description":"does not exist in memory, its location is 0x0000563f449b8358"},"command":"dataBreakpointInfo","request_seq":21,"seq":0,"success":true,"type":"response"}
1751719661.706096649 (stdio) --> {"command":"evaluate","arguments":{"expression":"Advanced Vector Extensionsymm0","frameId":524288,"context":"watch"},"type":"request","seq":22}
1751719661.720522165 (stdio) <-- {"body":{},"command":"evaluate","message":"error: <user expression 0>:1:1: unknown type name 'Advanced'\n    1 | Advanced Vector Extensionsymm0\n      | ^\nerror: <user expression 0>:1:16: expected ';' at end of declaration\n    1 | Advanced Vector Extensionsymm0\n      |                ^\n      |                ;\n","request_seq":22,"seq":0,"success":false,"type":"response"}

[llvmbot]

@llvm/issue-subscribers-lldb-dap

Author: None (DrSergei)

I found problem where "Add to Watch" doesn't work properly for vector registers (`evaluateName` is "Advanced Vector Extensionsymm0" instead of "$ymm0". I think the problem is inside LLDB. If I change `GetPreferSyntheticValue()` to `false` in `SBValue.cpp:698`, after that lldb-dap works fine. This suggests the problem is in the synthetic value logic

[da-viper]

Yes it is an issue with the synthetic values for vector registers. Normal Registers do not have this issues because it doesn't have a synthetic value.

In lldb-dap we use GetExpressionPath to get the evaluateName for the SBValue.

llvm-project/lldb/tools/lldb-dap/JSONUtils.cpp

Lines 802 to 804 in 0f0079c

	lldb::SBStream evaluateStream;
	v.GetExpressionPath(evaluateStream);
	evaluate_name = llvm::StringRef(evaluateStream.GetData()).str();

SBValues are backed by the ValueObject classes such as ValueObjectRegister, ValueObjectSynthetic ValueObjectVariable depending on the type.

In the case of registers if it does not have a synthetic type it uses the use its implementation of GetExpressionPath

llvm-project/lldb/source/ValueObject/ValueObjectRegister.cpp

Lines 305 to 308 in 0f0079c

	void ValueObjectRegister::GetExpressionPath(Stream &s,
	GetExpressionPathFormat epformat) {
	s.Printf("$%s", m_reg_info.name);
	}

If it has a synthetic type it uses the generic ValueObject::GetExpressionPath implementation.

llvm-project/lldb/source/ValueObject/ValueObject.cpp

Lines 2094 to 2187 in 0f0079c

	void ValueObject::GetExpressionPath(Stream &s,
	GetExpressionPathFormat epformat) {
	// synthetic children do not actually "exist" as part of the hierarchy, and
	// sometimes they are consed up in ways that don't make sense from an
	// underlying language/API standpoint. So, use a special code path here to
	// return something that can hopefully be used in expression
	if (m_flags.m_is_synthetic_children_generated) {
	UpdateValueIfNeeded();
	if (m_value.GetValueType() == Value::ValueType::LoadAddress) {
	if (IsPointerOrReferenceType()) {
	s.Printf("((%s)0x%" PRIx64 ")", GetTypeName().AsCString("void"),
	GetValueAsUnsigned(0));
	return;
	} else {
	uint64_t load_addr =
	m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
	if (load_addr != LLDB_INVALID_ADDRESS) {
	s.Printf("(*( (%s *)0x%" PRIx64 "))", GetTypeName().AsCString("void"),
	load_addr);
	return;
	}
	}
	}
	if (CanProvideValue()) {
	s.Printf("((%s)%s)", GetTypeName().AsCString("void"),
	GetValueAsCString());
	return;
	}
	return;
	}
	const bool is_deref_of_parent = IsDereferenceOfParent();
	if (is_deref_of_parent &&
	epformat == eGetExpressionPathFormatDereferencePointers) {
	// this is the original format of GetExpressionPath() producing code like
	// *(a_ptr).memberName, which is entirely fine, until you put this into
	// StackFrame::GetValueForVariableExpressionPath() which prefers to see
	// a_ptr->memberName. the eHonorPointers mode is meant to produce strings
	// in this latter format
	s.PutCString("*(");
	}
	ValueObject *parent = GetParent();
	if (parent)
	parent->GetExpressionPath(s, epformat);
	// if we are a deref_of_parent just because we are synthetic array members
	// made up to allow ptr[%d] syntax to work in variable printing, then add our
	// name ([%d]) to the expression path
	if (m_flags.m_is_array_item_for_pointer &&
	epformat == eGetExpressionPathFormatHonorPointers)
	s.PutCString(m_name.GetStringRef());
	if (!IsBaseClass()) {
	if (!is_deref_of_parent) {
	ValueObject *non_base_class_parent = GetNonBaseClassParent();
	if (non_base_class_parent &&
	!non_base_class_parent->GetName().IsEmpty()) {
	CompilerType non_base_class_parent_compiler_type =
	non_base_class_parent->GetCompilerType();
	if (non_base_class_parent_compiler_type) {
	if (parent && parent->IsDereferenceOfParent() &&
	epformat == eGetExpressionPathFormatHonorPointers) {
	s.PutCString("->");
	} else {
	const uint32_t non_base_class_parent_type_info =
	non_base_class_parent_compiler_type.GetTypeInfo();
	if (non_base_class_parent_type_info & eTypeIsPointer) {
	s.PutCString("->");
	} else if ((non_base_class_parent_type_info & eTypeHasChildren) &&
	!(non_base_class_parent_type_info & eTypeIsArray)) {
	s.PutChar('.');
	}
	}
	}
	}
	const char *name = GetName().GetCString();
	if (name)
	s.PutCString(name);
	}
	}
	if (is_deref_of_parent &&
	epformat == eGetExpressionPathFormatDereferencePointers) {
	s.PutChar(')');
	}
	}

A solution could be something along the lines of

  if (v.IsSynthetic() && v.GetValueType() == lldb::ValueType::eValueTypeRegister) {
    evaluate_name = "$"+ name;
  }

either in only lldb-dap or in the ValueObject::GetExpressionPath. or disable SetPreferSyntheticValue briefly before calling GetExpressionPath

Not sure the best place to address the issue. pinging @ashgti @JDevlieghere as there may be a better solution.