#define LLVM_CODEGEN_GCSTRATEGY_H
#include "llvm/CodeGen/GCMetadata.h"
+#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/Support/Registry.h"
-#include <iosfwd>
#include <string>
namespace llvm {
list_type Functions;
protected:
- unsigned NeededSafePoints; //< Bitmask of required safe points.
- bool CustomReadBarriers; //< Default is to insert loads.
- bool CustomWriteBarriers; //< Default is to insert stores.
- bool CustomRoots; //< Default is to pass through to backend.
- bool InitRoots; //< If set, roots are nulled during lowering.
- bool UsesMetadata; //< If set, backend must emit metadata tables.
+ unsigned NeededSafePoints; ///< Bitmask of required safe points.
+ bool CustomReadBarriers; ///< Default is to insert loads.
+ bool CustomWriteBarriers; ///< Default is to insert stores.
+ bool CustomRoots; ///< Default is to pass through to backend.
+ bool CustomSafePoints; ///< Default is to use NeededSafePoints
+ ///< to find safe points.
+ bool InitRoots; ///< If set, roots are nulled during lowering.
+ bool UsesMetadata; ///< If set, backend must emit metadata tables.
public:
GCStrategy();
/// needsSafePoitns - True if safe points of any kind are required. By
// default, none are recorded.
- bool needsSafePoints() const { return NeededSafePoints != 0; }
+ bool needsSafePoints() const {
+ return CustomSafePoints || NeededSafePoints != 0;
+ }
/// needsSafePoint(Kind) - True if the given kind of safe point is
// required. By default, none are recorded.
/// can generate a stack map. If true, then
// performCustomLowering must delete them.
bool customRoots() const { return CustomRoots; }
+
+ /// customSafePoints - By default, the GC analysis will find safe
+ /// points according to NeededSafePoints. If true,
+ /// then findCustomSafePoints must create them.
+ bool customSafePoints() const { return CustomSafePoints; }
/// initializeRoots - If set, gcroot intrinsics should initialize their
// allocas to null before the first use. This is
/// which the LLVM IR can be modified.
virtual bool initializeCustomLowering(Module &F);
virtual bool performCustomLowering(Function &F);
+ virtual bool findCustomSafePoints(GCFunctionInfo& FI, MachineFunction& MF);
};
}