Add helper functions for creating return value variables.

src/apps/debugger/debug_info/DwarfStackFrameDebugInfo.cpp

@@ -1,4 +1,5 @@
 /*
+ * Copyright 2012, Rene Gollent, [email protected].
  * Copyright 2009, Ingo Weinhold, [email protected].
  * Distributed under the terms of the MIT License.
  */
@@ -23,6 +24,7 @@
 #include "LocalVariableID.h"
 #include "Register.h"
 #include "RegisterMap.h"
+#include "ReturnValueID.h"
 #include "StringUtils.h"
 #include "Tracing.h"
 #include "ValueLocation.h"
@@ -117,6 +119,47 @@ private:
 };
 
 
+// #pragma mark - DwarfReturnValueID
+
+
+struct DwarfStackFrameDebugInfo::DwarfReturnValueID
+	: public ReturnValueID {
+
+	DwarfReturnValueID(FunctionID* functionID)
+		:
+		fFunctionID(functionID),
+		fName("(returned)")
+	{
+		fFunctionID->AcquireReference();
+	}
+
+	virtual ~DwarfReturnValueID()
+	{
+		fFunctionID->ReleaseReference();
+	}
+
+	virtual bool operator==(const ObjectID& other) const
+	{
+		const DwarfReturnValueID* returnValueID
+			= dynamic_cast<const DwarfReturnValueID*>(&other);
+		return returnValueID != NULL
+			&& *fFunctionID == *returnValueID->fFunctionID
+			&& fName == returnValueID->fName;
+	}
+
+protected:
+	virtual uint32 ComputeHashValue() const
+	{
+		uint32 hash = fFunctionID->HashValue();
+		return hash * 25 + StringUtils::HashValue(fName);
+	}
+
+private:
+	FunctionID*		fFunctionID;
+	const BString	fName;
+};
+
+
 // #pragma mark - DwarfStackFrameDebugInfo
 
 
@@ -234,6 +277,39 @@ DwarfStackFrameDebugInfo::CreateLocalVariable(FunctionID* functionID,
 }
 
 
+status_t
+DwarfStackFrameDebugInfo::CreateReturnValue(FunctionID* functionID,
+	DIEType* returnType, ValueLocation* location, Variable*& _variable)
+{
+	if (returnType == NULL)
+		return B_BAD_VALUE;
+
+	// create the type
+	DwarfType* type;
+	status_t error = fTypeFactory->CreateType(returnType, type);
+	if (error != B_OK)
+		return error;
+	BReference<DwarfType> typeReference(type, true);
+
+	DwarfReturnValueID* id = new(std::nothrow) DwarfReturnValueID(
+		functionID);
+	if (id == NULL)
+		return B_NO_MEMORY;
+
+	BString name;
+	name.SetToFormat("%s returned", functionID->FunctionName().String());
+
+	Variable* variable = new(std::nothrow) Variable(id, name,
+		type, location);
+	if (variable == NULL)
+		return B_NO_MEMORY;
+
+	_variable = variable;
+
+	return B_OK;
+}
+
+
 status_t
 DwarfStackFrameDebugInfo::_CreateVariable(ObjectID* id, const BString& name,
 	DIEType* typeEntry, LocationDescription* locationDescription,

src/apps/debugger/debug_info/DwarfStackFrameDebugInfo.h

@@ -1,4 +1,5 @@
 /*
+ * Copyright 2012, Rene Gollent, [email protected].
  * Copyright 2009, Ingo Weinhold, [email protected].
  * Distributed under the terms of the MIT License.
  */
@@ -56,10 +57,16 @@ public:
 									DIEVariable* variableEntry,
 									Variable*& _variable);
 									// returns reference
+			status_t			CreateReturnValue(FunctionID* functionID,
+									DIEType* returnType,
+									ValueLocation* location,
+									Variable*& _variable);
+									// returns reference
 
 private:
 			struct DwarfFunctionParameterID;
 			struct DwarfLocalVariableID;
+			struct DwarfReturnValueID;
 
 private:
 			status_t			_CreateVariable(ObjectID* id,