X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FTarget%2FTargetFrameLowering.h;h=f7a9a0a15fb4370dae844b6d6471dea93809da4c;hb=c8cfff3bc830806762924a898326ece450f6ee09;hp=25d43c82cd74e7de00c5ce2ece60020255da73db;hpb=01461204b3ed993372d1b217ac8861a370a5d8e0;p=oota-llvm.git

diff --git a/include/llvm/Target/TargetFrameLowering.h b/include/llvm/Target/TargetFrameLowering.h
index 25d43c82cd7..f7a9a0a15fb 100644
--- a/include/llvm/Target/TargetFrameLowering.h
+++ b/include/llvm/Target/TargetFrameLowering.h
@@ -19,6 +19,7 @@
 #include <vector>
 
 namespace llvm {
+  class BitVector;
   class CalleeSavedInfo;
   class MachineFunction;
   class RegScavenger;
@@ -69,6 +70,18 @@ public:
   ///
   unsigned getStackAlignment() const { return StackAlignment; }
 
+  /// alignSPAdjust - This method aligns the stack adjustment to the correct
+  /// alignment.
+  ///
+  int alignSPAdjust(int SPAdj) const {
+    if (SPAdj < 0) {
+      SPAdj = -RoundUpToAlignment(-SPAdj, StackAlignment);
+    } else {
+      SPAdj = RoundUpToAlignment(SPAdj, StackAlignment);
+    }
+    return SPAdj;
+  }
+
   /// getTransientStackAlignment - This method returns the number of bytes to
   /// which the stack pointer must be aligned at all times, even between
   /// calls.
@@ -206,10 +219,6 @@ public:
   // has any stack objects. However, targets may want to override this.
   virtual bool needsFrameIndexResolution(const MachineFunction &MF) const;
 
-  /// getFrameIndexOffset - Returns the displacement from the frame register to
-  /// the stack frame of the specified index.
-  virtual int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
-
   /// getFrameIndexReference - This method should return the base register
   /// and offset used to reference a frame index location. The offset is
   /// returned directly, and the base register is returned via FrameReg.
@@ -226,13 +235,15 @@ public:
     return 0;
   }
 
-  /// processFunctionBeforeCalleeSavedScan - This method is called immediately
-  /// before PrologEpilogInserter scans the physical registers used to determine
-  /// what callee saved registers should be spilled. This method is optional.
-  virtual void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
-                                             RegScavenger *RS = nullptr) const {
-
-  }
+  /// This method determines which of the registers reported by
+  /// TargetRegisterInfo::getCalleeSavedRegs() should actually get saved.
+  /// The default implementation checks populates the \p SavedRegs bitset with
+  /// all registers which are modified in the function, targets may override
+  /// this function to save additional registers.
+  /// This method also sets up the register scavenger ensuring there is a free
+  /// register or a frameindex available.
+  virtual void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
+                                    RegScavenger *RS = nullptr) const;
 
   /// processFunctionBeforeFrameFinalized - This method is called immediately
   /// before the specified function's frame layout (MF.getFrameInfo()) is
@@ -257,6 +268,30 @@ public:
     llvm_unreachable("Call Frame Pseudo Instructions do not exist on this "
                      "target!");
   }
+
+  /// Check whether or not the given \p MBB can be used as a prologue
+  /// for the target.
+  /// The prologue will be inserted first in this basic block.
+  /// This method is used by the shrink-wrapping pass to decide if
+  /// \p MBB will be correctly handled by the target.
+  /// As soon as the target enable shrink-wrapping without overriding
+  /// this method, we assume that each basic block is a valid
+  /// prologue.
+  virtual bool canUseAsPrologue(const MachineBasicBlock &MBB) const {
+    return true;
+  }
+
+  /// Check whether or not the given \p MBB can be used as a epilogue
+  /// for the target.
+  /// The epilogue will be inserted before the first terminator of that block.
+  /// This method is used by the shrink-wrapping pass to decide if
+  /// \p MBB will be correctly handled by the target.
+  /// As soon as the target enable shrink-wrapping without overriding
+  /// this method, we assume that each basic block is a valid
+  /// epilogue.
+  virtual bool canUseAsEpilogue(const MachineBasicBlock &MBB) const {
+    return true;
+  }
 };
 
 } // End llvm namespace