1 files changed, 40 insertions, 6 deletions

diff --git a/Source/Core/Common/CodeBlock.h b/Source/Core/Common/CodeBlock.h
index 972fc707d6..8f02f08336 100644
--- a/Source/Core/Common/CodeBlock.h
+++ b/Source/Core/Common/CodeBlock.h
@@ -4,8 +4,9 @@
 
 #pragma once
 
-#include "Common/Common.h"
+#include "Common/Assert.h"
 #include "Common/MemoryUtil.h"
+#include "Common/NonCopyable.h"
 
 // Everything that needs to generate code should inherit from this.
 // You get memory management for free, plus, you can use all emitter functions without
@@ -22,16 +23,26 @@ private:
 protected:
 	u8 *region;
 	size_t region_size;
+	size_t parent_region_size;
+
+	bool m_has_child;
+	bool m_is_child;
+	CodeBlock* m_child;
 
 public:
-	CodeBlock() : region(nullptr), region_size(0) {}
+	CodeBlock()
+		: region(nullptr), region_size(0), parent_region_size(0),
+		  m_has_child(false), m_is_child(false), m_child(nullptr)
+	{
+	}
+
 	virtual ~CodeBlock() { if (region) FreeCodeSpace(); }
 
 	// Call this before you generate any code.
-	void AllocCodeSpace(int size)
+	void AllocCodeSpace(int size, bool need_low = true)
 	{
 		region_size = size;
-		region = (u8*)AllocateExecutableMemory(region_size);
+		region = (u8*)AllocateExecutableMemory(region_size, need_low);
 		T::SetCodePtr(region);
 	}
 
@@ -49,6 +60,12 @@ public:
 		FreeMemoryPages(region, region_size);
 		region = nullptr;
 		region_size = 0;
+		parent_region_size = 0;
+		if (m_has_child)
+		{
+			m_child->region = nullptr;
+			m_child->region_size = 0;
+		}
 	}
 
 	bool IsInSpace(u8 *ptr) const
@@ -70,7 +87,24 @@ public:
 
 	size_t GetSpaceLeft() const
 	{
-		return region_size - (T::GetCodePtr() - region);
+		return (m_has_child ? parent_region_size : region_size) - (T::GetCodePtr() - region);
 	}
-};
 
+	bool IsAlmostFull() const
+	{
+		// This should be bigger than the biggest block ever.
+		return GetSpaceLeft() < 0x10000;
+	}
+	void AddChildCodeSpace(CodeBlock* child, size_t size)
+	{
+		_assert_msg_(DYNA_REC, !m_has_child, "Already have a child! Can't have another!");
+		m_child = child;
+		m_has_child = true;
+		m_child->m_is_child = true;
+		u8* child_region = region + region_size - size;
+		m_child->region = child_region;
+		m_child->region_size = size;
+		m_child->ResetCodePtr();
+		parent_region_size = region_size - size;
+	}
+};