Debugger: Extend FunctionDebugInfo interface.

- Add hook to FunctionDebugInfo to determine if the represented function
is the main function of the program. Adjust
{Basic,Dwarf}FunctionDebugInfo accordingly.

- {Team,Image}DebugInfo: When loading, see if the current image contains
the main function. If so, cache it for later retrieval.

src/apps/debugger/debug_info/BasicFunctionDebugInfo.cpp

@@ -63,6 +63,13 @@ BasicFunctionDebugInfo::PrettyName() const
 }
 
 
+bool
+BasicFunctionDebugInfo::IsMain() const
+{
+	return false;
+}
+
+
 LocatableFile*
 BasicFunctionDebugInfo::SourceFile() const
 {

src/apps/debugger/debug_info/BasicFunctionDebugInfo.h

@@ -26,6 +26,8 @@ public:
 	virtual	const BString&		Name() const;
 	virtual	const BString&		PrettyName() const;
 
+	virtual	bool				IsMain() const;
+
 	virtual	LocatableFile*		SourceFile() const;
 	virtual	SourceLocation		SourceStartLocation() const;
 	virtual	SourceLocation		SourceEndLocation() const;

src/apps/debugger/debug_info/DwarfFunctionDebugInfo.cpp

@@ -78,6 +78,13 @@ DwarfFunctionDebugInfo::PrettyName() const
 }
 
 
+bool
+DwarfFunctionDebugInfo::IsMain() const
+{
+	return fSubprogramEntry->IsMain();
+}
+
+
 LocatableFile*
 DwarfFunctionDebugInfo::SourceFile() const
 {

src/apps/debugger/debug_info/DwarfFunctionDebugInfo.h

@@ -35,6 +35,8 @@ public:
 	virtual	const BString&		Name() const;
 	virtual	const BString&		PrettyName() const;
 
+	virtual	bool				IsMain() const;
+
 	virtual	LocatableFile*		SourceFile() const;
 	virtual	SourceLocation		SourceStartLocation() const;
 	virtual	SourceLocation		SourceEndLocation() const;

src/apps/debugger/debug_info/FunctionDebugInfo.h

@@ -27,6 +27,8 @@ public:
 	virtual	const BString&		Name() const = 0;
 	virtual	const BString&		PrettyName() const = 0;
 
+	virtual	bool				IsMain() const = 0;
+
 	virtual	LocatableFile*		SourceFile() const = 0;
 	virtual	SourceLocation		SourceStartLocation() const = 0;
 	virtual	SourceLocation		SourceEndLocation() const = 0;

src/apps/debugger/debug_info/ImageDebugInfo.cpp

@@ -17,7 +17,8 @@
 
 ImageDebugInfo::ImageDebugInfo(const ImageInfo& imageInfo)
 	:
-	fImageInfo(imageInfo)
+	fImageInfo(imageInfo),
+	fMainFunction(NULL)
 {
 }
 
@@ -68,6 +69,9 @@ ImageDebugInfo::FinishInit(DebuggerInterface* interface)
 				error = B_NO_MEMORY;
 				break;
 			}
+
+			if (function->IsMain())
+				fMainFunction = instance;
 		}
 
 		// Remove references returned by the specific debug info -- the

src/apps/debugger/debug_info/ImageDebugInfo.h

@@ -53,6 +53,9 @@ public:
 			FunctionInstance*	FunctionAtAddress(target_addr_t address) const;
 			FunctionInstance*	FunctionByName(const char* name) const;
 
+			FunctionInstance*	MainFunction() const
+									{ return fMainFunction; }
+
 			status_t			AddSourceCodeInfo(LocatableFile* file,
 									FileSourceCode* sourceCode) const;
 
@@ -73,6 +76,7 @@ private:
 			ImageInfo			fImageInfo;
 			SpecificInfoList	fSpecificInfos;
 			FunctionList		fFunctions;
+			FunctionInstance*	fMainFunction;
 };
 
 

src/apps/debugger/debug_info/TeamDebugInfo.cpp

@@ -267,7 +267,8 @@ TeamDebugInfo::TeamDebugInfo(DebuggerInterface* debuggerInterface,
 	fSpecificInfos(10, true),
 	fFunctions(NULL),
 	fSourceFiles(NULL),
-	fTypeCache(NULL)
+	fTypeCache(NULL),
+	fMainFunction(NULL)
 {
 	fDebuggerInterface->AcquireReference();
 }
@@ -452,6 +453,12 @@ TeamDebugInfo::LoadImageDebugInfo(const ImageInfo& imageInfo,
 	if (error != B_OK)
 		return error;
 
+	if (fMainFunction == NULL) {
+		FunctionInstance* instance = imageDebugInfo->MainFunction();
+		if (instance != NULL)
+			fMainFunction = instance;
+	}
+
 	_imageDebugInfo = imageDebugInfoReference.Detach();
 	return B_OK;
 }

src/apps/debugger/debug_info/TeamDebugInfo.h

@@ -63,6 +63,8 @@ public:
 									FunctionInstance* functionInstance,
 									DisassembledCode*& _sourceCode);
 										// returns reference
+			FunctionInstance*	MainFunction() const
+									{ return fMainFunction; }
 
 			// team is locked
 			status_t			AddImageDebugInfo(
@@ -99,6 +101,7 @@ private:
 			FunctionTable*		fFunctions;
 			SourceFileTable*	fSourceFiles;
 			GlobalTypeCache*	fTypeCache;
+			FunctionInstance*	fMainFunction;
 };