Debugger: Handle some more v4 attributes.

- DIECompileUnit can also be marked with DW_AT_main_subprogram to
indicate that the main program resides within that particular unit.

- DIEBaseType and DIEMember now have the additional attribute
DW_AT_data_bit_offset which defines the offset in a somewhat different
manner than DWARF2/3's DW_AT_bit_offset, and deprecates the latter.

Unused/untested for the moment, as gcc 4.7.3 doesn't yet appear to be
generating either of the above attributes.

src/apps/debugger/dwarf/DebugInfoEntries.cpp

@@ -28,7 +28,8 @@ DIECompileUnitBase::DIECompileUnitBase()
 	fBaseTypesUnit(NULL),
 	fLanguage(0),
 	fIdentifierCase(0),
-	fUseUTF8(true)
+	fUseUTF8(true),
+	fContainsMainSubprogram(false)
 {
 }
 
@@ -190,6 +191,15 @@ DIECompileUnitBase::AddAttribute_ranges(uint16 attributeName,
 }
 
 
+status_t
+DIECompileUnitBase::AddAttribute_main_subprogram(uint16 attributeName,
+	const AttributeValue& value)
+{
+	fContainsMainSubprogram = true;
+	return B_OK;
+}
+
+
 // #pragma mark - DIEType
 
 
@@ -1069,6 +1079,14 @@ DIEMember::AddAttribute_bit_offset(uint16 attributeName,
 }
 
 
+status_t
+DIEMember::AddAttribute_data_bit_offset(uint16 attributeName,
+	const AttributeValue& value)
+{
+	return SetDynamicAttributeValue(fDataBitOffset, value);
+}
+
+
 // #pragma mark - DIEPointerType
 
 
@@ -1645,6 +1663,14 @@ DIEBaseType::AddAttribute_bit_offset(uint16 attributeName,
 }
 
 
+status_t
+DIEBaseType::AddAttribute_data_bit_offset(uint16 attributeName,
+	const AttributeValue& value)
+{
+	return SetDynamicAttributeValue(fDataBitOffset, value);
+}
+
+
 status_t
 DIEBaseType::AddAttribute_endianity(uint16 attributeName,
 	const AttributeValue& value)

src/apps/debugger/dwarf/DebugInfoEntries.h

@@ -161,6 +161,9 @@ public:
 			off_t				StatementListOffset() const
 									{ return fStatementListOffset; }
 
+			bool				ContainsMainSubprogram() const
+									{ return fContainsMainSubprogram; }
+
 	virtual	status_t			AddChild(DebugInfoEntry* child);
 
 	virtual	status_t			AddAttribute_name(uint16 attributeName,
@@ -188,6 +191,9 @@ public:
 									const AttributeValue& value);
 	virtual	status_t			AddAttribute_ranges(uint16 attributeName,
 									const AttributeValue& value);
+	virtual	status_t			AddAttribute_main_subprogram(
+									uint16 attributeName,
+									const AttributeValue& value);
 
 //TODO:
 //	virtual	status_t			AddAttribute_segment(uint16 attributeName,
@@ -209,6 +215,7 @@ protected:
 			uint16				fLanguage;
 			uint8				fIdentifierCase;
 			bool				fUseUTF8;
+			bool				fContainsMainSubprogram;
 };
 
 
@@ -669,6 +676,8 @@ public:
 									{ return &fByteSize; }
 			const DynamicAttributeValue* BitOffset() const
 									{ return &fBitOffset; }
+			const DynamicAttributeValue* DataBitOffset() const
+									{ return &fDataBitOffset; }
 			const DynamicAttributeValue* BitSize() const
 									{ return &fBitSize; }
 			const MemberLocation* Location() const
@@ -682,6 +691,9 @@ public:
 									const AttributeValue& value);
 	virtual	status_t			AddAttribute_bit_offset(uint16 attributeName,
 									const AttributeValue& value);
+	virtual	status_t			AddAttribute_data_bit_offset(
+									uint16 attributeName,
+									const AttributeValue& value);
 	virtual	status_t			AddAttribute_data_member_location(
 									uint16 attributeName,
 									const AttributeValue& value);
@@ -693,6 +705,7 @@ private:
 			DIEType*			fType;
 			DynamicAttributeValue fByteSize;
 			DynamicAttributeValue fBitOffset;
+			DynamicAttributeValue fDataBitOffset;
 			DynamicAttributeValue fBitSize;
 			MemberLocation		fLocation;
 };
@@ -1041,6 +1054,8 @@ public:
 	virtual	const DynamicAttributeValue* ByteSize() const;
 			const DynamicAttributeValue* BitOffset() const
 									{ return &fBitOffset; }
+			const DynamicAttributeValue* DataBitOffset() const
+									{ return &fDataBitOffset; }
 			const DynamicAttributeValue* BitSize() const
 									{ return &fBitSize; }
 			uint8				Encoding() const	{ return fEncoding; }
@@ -1054,6 +1069,9 @@ public:
 									const AttributeValue& value);
 	virtual	status_t			AddAttribute_bit_offset(uint16 attributeName,
 									const AttributeValue& value);
+	virtual	status_t			AddAttribute_data_bit_offset(
+									uint16 attributeName,
+									const AttributeValue& value);
 	virtual	status_t			AddAttribute_endianity(uint16 attributeName,
 									const AttributeValue& value);
 
@@ -1069,6 +1087,7 @@ public:
 private:
 			DynamicAttributeValue fByteSize;
 			DynamicAttributeValue fBitOffset;
+			DynamicAttributeValue fDataBitOffset;
 			DynamicAttributeValue fBitSize;
 			uint8				fEncoding;
 			uint8				fEndianity;