Implement parsing of DW_AT_calling_convention.

Will be used later in order to determine if a given call obeys the
standard calling convention, in order to determine if we can safely
attempt to retrieve its return value.

src/apps/debugger/dwarf/DebugInfoEntries.cpp

@@ -1837,7 +1837,8 @@ DIESubprogram::DIESubprogram()
 	fAddressClass(0),
 	fPrototyped(false),
 	fInline(DW_INL_not_inlined),
-	fArtificial(false)
+	fArtificial(false),
+	fCallingConvention(DW_CC_normal)
 {
 }
 
@@ -2005,6 +2006,15 @@ DIESubprogram::AddAttribute_artificial(uint16 attributeName,
 }
 
 
+status_t
+DIESubprogram::AddAttribute_calling_convention(uint16 attributeName,
+	const AttributeValue& value)
+{
+	fCallingConvention = value.constant;
+	return B_OK;
+}
+
+
 // #pragma mark - DIETemplateTypeParameter
 
 

src/apps/debugger/dwarf/DebugInfoEntries.h

@@ -1225,6 +1225,8 @@ public:
 			bool				IsPrototyped() const	{ return fPrototyped; }
 			uint8				Inline() const			{ return fInline; }
 			bool				IsArtificial() const	{ return fArtificial; }
+			uint8				CallingConvention() const
+										{ return fCallingConvention; }
 
 			DIEType*			ReturnType() const		{ return fReturnType; }
 
@@ -1255,6 +1257,9 @@ public:
 	virtual	status_t			AddAttribute_artificial(
 									uint16 attributeName,
 									const AttributeValue& value);
+	virtual status_t			AddAttribute_calling_convention(
+									uint16 attributeName,
+									const AttributeValue& value);
 
 protected:
 			DebugInfoEntryList	fParameters;
@@ -1273,9 +1278,9 @@ protected:
 			bool				fPrototyped;
 			uint8				fInline;
 			bool				fArtificial;
+			uint8				fCallingConvention;
 
 // TODO:
-// DW_AT_calling_convention
 // DW_AT_elemental
 // DW_AT_entry_pc
 // DW_AT_explicit