Introduce a flag in ExpressionEvaluationContext in order to distinguish between

cases where no object pointer is available vs the object pointer being present
but NULL, which would previously not be pushed onto the stack, leading to
expression evaluation failures.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42274 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/debugger/debug_info/DwarfStackFrameDebugInfo.cpp

@@ -258,7 +258,7 @@ DwarfStackFrameDebugInfo::_CreateVariable(ObjectID* id, const BString& name,
 
 	if (locationDescription->IsValid()) {
 		status_t error = type->ResolveLocation(fTypeContext,
-			locationDescription, 0, *location);
+			locationDescription, 0, false, *location);
 		if (error != B_OK)
 			return error;
 

src/apps/debugger/debug_info/DwarfTypes.cpp

@@ -213,13 +213,14 @@ DwarfType::ResolveObjectDataLocation(target_addr_t objectAddress,
 status_t
 DwarfType::ResolveLocation(DwarfTypeContext* typeContext,
 	const LocationDescription* description, target_addr_t objectAddress,
-	ValueLocation& _location)
+	bool hasObjectAddress, ValueLocation& _location)
 {
 	status_t error = typeContext->File()->ResolveLocation(
 		typeContext->GetCompilationUnit(), typeContext->SubprogramEntry(),
 		description, typeContext->TargetInterface(),
-		typeContext->InstructionPointer(), objectAddress,
-		typeContext->FramePointer(), typeContext->RelocationDelta(), _location);
+		typeContext->InstructionPointer(), objectAddress, hasObjectAddress,
+		typeContext->FramePointer(), typeContext->RelocationDelta(),
+		_location);
 	if (error != B_OK)
 		return error;
 
@@ -678,7 +679,7 @@ DwarfCompoundType::_ResolveDataMemberLocation(DwarfType* memberType,
 
 			// evaluate the location description
 			status_t error = memberType->ResolveLocation(TypeContext(),
-				&locationDescription, piece.address, *location);
+				&locationDescription, piece.address, true, *location);
 			if (error != B_OK)
 				return error;
 

src/apps/debugger/debug_info/DwarfTypes.h

@@ -120,6 +120,7 @@ public:
 			status_t			ResolveLocation(DwarfTypeContext* typeContext,
 									const LocationDescription* description,
 									target_addr_t objectAddress,
+									bool hasObjectAddress,
 									ValueLocation& _location);
 
 private:

src/apps/debugger/dwarf/DwarfFile.cpp

@@ -36,7 +36,7 @@ public:
 		DIESubprogram* subprogramEntry,
 		const DwarfTargetInterface* targetInterface,
 		target_addr_t instructionPointer, target_addr_t objectPointer,
-		target_addr_t framePointer,
+		bool hasObjectPointer, target_addr_t framePointer,
 		target_addr_t relocationDelta)
 		:
 		DwarfExpressionEvaluationContext(targetInterface, unit->AddressSize(),
@@ -46,6 +46,7 @@ public:
 		fSubprogramEntry(subprogramEntry),
 		fInstructionPointer(instructionPointer),
 		fObjectPointer(objectPointer),
+		fHasObjectPointer(hasObjectPointer),
 		fFramePointer(framePointer),
 		fFrameBasePointer(0),
 		fFrameBaseEvaluated(false)
@@ -54,7 +55,7 @@ public:
 
 	virtual bool GetObjectAddress(target_addr_t& _address)
 	{
-		if (fObjectPointer == 0)
+		if (!fHasObjectPointer)
 			return false;
 
 		_address = fObjectPointer;
@@ -145,6 +146,7 @@ private:
 	DIESubprogram*		fSubprogramEntry;
 	target_addr_t		fInstructionPointer;
 	target_addr_t		fObjectPointer;
+	bool				fHasObjectPointer;
 	target_addr_t		fFramePointer;
 	target_addr_t		fFrameBasePointer;
 	bool				fFrameBaseEvaluated;
@@ -827,7 +829,7 @@ DwarfFile::EvaluateExpression(CompilationUnit* unit,
 	target_addr_t valueToPush, bool pushValue, target_addr_t& _result)
 {
 	ExpressionEvaluationContext context(this, unit, subprogramEntry,
-		targetInterface, instructionPointer, 0, framePointer, 0);
+		targetInterface, instructionPointer, 0, false, framePointer, 0);
 	DwarfExpressionEvaluator evaluator(&context);
 
 	if (pushValue && evaluator.Push(valueToPush) != B_OK)
@@ -842,8 +844,8 @@ DwarfFile::ResolveLocation(CompilationUnit* unit,
 	DIESubprogram* subprogramEntry, const LocationDescription* location,
 	const DwarfTargetInterface* targetInterface,
 	target_addr_t instructionPointer, target_addr_t objectPointer,
-	target_addr_t framePointer, target_addr_t relocationDelta,
-	ValueLocation& _result)
+	bool hasObjectPointer, target_addr_t framePointer,
+	target_addr_t relocationDelta, ValueLocation& _result)
 {
 	// get the expression
 	const void* expression;
@@ -855,8 +857,8 @@ DwarfFile::ResolveLocation(CompilationUnit* unit,
 
 	// evaluate it
 	ExpressionEvaluationContext context(this, unit, subprogramEntry,
-		targetInterface, instructionPointer, objectPointer, framePointer,
-		relocationDelta);
+		targetInterface, instructionPointer, objectPointer, hasObjectPointer,
+		framePointer, relocationDelta);
 	DwarfExpressionEvaluator evaluator(&context);
 	return evaluator.EvaluateLocation(expression, expressionLength,
 		_result);

src/apps/debugger/dwarf/DwarfFile.h

@@ -68,6 +68,7 @@ public:
 									const DwarfTargetInterface* targetInterface,
 									target_addr_t instructionPointer,
 									target_addr_t objectPointer,
+									bool hasObjectPointer,
 									target_addr_t framePointer,
 									target_addr_t relocationDelta,
 									ValueLocation& _result);