Add architecture function for retrieving the stack growth direction.

Also add corresponding implementation for x86.

src/apps/debugger/arch/Architecture.h

@@ -1,5 +1,6 @@
 /*
  * Copyright 2009, Ingo Weinhold, [email protected].
+ * Copyright 2011, Rene Gollent, [email protected].
  * Distributed under the terms of the MIT License.
  */
 #ifndef ARCHITECTURE_H
@@ -31,6 +32,12 @@ class Team;
 class TeamMemory;
 
 
+enum {
+	STACK_GROWTH_DIRECTION_POSITIVE = 0,
+	STACK_GROWTH_DIRECTION_NEGATIVE
+};
+
+
 class Architecture : public BReferenceable {
 public:
 								Architecture(TeamMemory* teamMemory,
@@ -44,6 +51,8 @@ public:
 	inline	bool				IsBigEndian() const		{ return fBigEndian; }
 	inline	bool				IsHostEndian() const;
 
+	virtual int32				StackGrowthDirection() const = 0;
+
 	virtual	int32				CountRegisters() const = 0;
 	virtual	const Register*		Registers() const = 0;
 	virtual status_t			InitRegisterRules(CfaContext& context) const;

src/apps/debugger/arch/x86/ArchitectureX86.cpp

@@ -1,5 +1,6 @@
 /*
  * Copyright 2009, Ingo Weinhold, [email protected].
+ * Copyright 2011, Rene Gollent, [email protected].
  * Distributed under the terms of the MIT License.
  */
 
@@ -180,6 +181,13 @@ ArchitectureX86::Init()
 }
 
 
+int32
+ArchitectureX86::StackGrowthDirection() const
+{
+	return STACK_GROWTH_DIRECTION_NEGATIVE;
+}
+
+
 int32
 ArchitectureX86::CountRegisters() const
 {

src/apps/debugger/arch/x86/ArchitectureX86.h

@@ -1,5 +1,6 @@
 /*
  * Copyright 2009, Ingo Weinhold, [email protected].
+ * Copyright 2011, Rene Gollent, [email protected].
  * Distributed under the terms of the MIT License.
  */
 #ifndef ARCHITECTURE_X86_H
@@ -22,6 +23,8 @@ public:
 
 	virtual	status_t			Init();
 
+	virtual int32				StackGrowthDirection() const;	
+
 	virtual	int32				CountRegisters() const;
 	virtual	const Register*		Registers() const;
 	virtual status_t			InitRegisterRules(CfaContext& context) const;