[SEH] Add new intrinsics for recovering and restoring parent frames

[oota-llvm.git] / lib / Target / X86 / X86FrameLowering.h

diff --git a/lib/Target/X86/X86FrameLowering.h b/lib/Target/X86/X86FrameLowering.h
index eeeda75d33783114ac3b66f632574ac35bda95c6..c274c88201496e88a425b4f673f6c2d9456a89e8 100644 (file)
--- a/lib/Target/X86/X86FrameLowering.h
+++ b/lib/Target/X86/X86FrameLowering.h
@@ -18,16 +18,40 @@
 
 namespace llvm {
 
+class MachineInstrBuilder;
+class MCCFIInstruction;
+class X86Subtarget;
+class X86RegisterInfo;
+
 class X86FrameLowering : public TargetFrameLowering {
 public:
-  explicit X86FrameLowering(StackDirection D, unsigned StackAl, int LAO)
-    : TargetFrameLowering(StackGrowsDown, StackAl, LAO) {}
+  X86FrameLowering(const X86Subtarget &STI, unsigned StackAlignOverride);
+
+  // Cached subtarget predicates.
+
+  const X86Subtarget &STI;
+  const TargetInstrInfo &TII;
+  const X86RegisterInfo *TRI;
+
+  unsigned SlotSize;
+
+  /// Is64Bit implies that x86_64 instructions are available.
+  bool Is64Bit;
+
+  bool IsLP64;
+
+  /// True if the 64-bit frame or stack pointer should be used. True for most
+  /// 64-bit targets with the exception of x32. If this is false, 32-bit
+  /// instruction operands should be used to manipulate StackPtr and FramePtr.
+  bool Uses64BitFramePtr;
+
+  unsigned StackPtr;
 
   /// Emit a call to the target's stack probe function. This is required for all
   /// large stack allocations on Windows. The caller is required to materialize
   /// the number of bytes to probe in RAX/EAX.
-  static void emitStackProbeCall(MachineFunction &MF, MachineBasicBlock &MBB,
-                                 MachineBasicBlock::iterator MBBI, DebugLoc DL);
+  void emitStackProbeCall(MachineFunction &MF, MachineBasicBlock &MBB,
+                          MachineBasicBlock::iterator MBBI, DebugLoc DL) const;
 
   void emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
                                  MachineBasicBlock::iterator MBBI,
@@ -83,21 +107,23 @@ public:
   /// it is an ADD/SUB/LEA instruction it is deleted argument and the
   /// stack adjustment is returned as a positive value for ADD/LEA and
   /// a negative for SUB.
-  static int mergeSPUpdates(MachineBasicBlock &MBB,
-                            MachineBasicBlock::iterator &MBBI,
-                            unsigned StackPtr, bool doMergeWithPrevious);
+  int mergeSPUpdates(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
+                     bool doMergeWithPrevious) const;
 
   /// Emit a series of instructions to increment / decrement the stack
   /// pointer by a constant value.
-  static void emitSPUpdate(MachineBasicBlock &MBB,
-                           MachineBasicBlock::iterator &MBBI, unsigned StackPtr,
-                           int64_t NumBytes, bool Is64BitTarget,
-                           bool Is64BitStackPtr, bool UseLEA,
-                           const TargetInstrInfo &TII,
-                           const TargetRegisterInfo &TRI);
+  void emitSPUpdate(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
+                    int64_t NumBytes, bool InEpilogue) const;
+
+  /// Check that LEA can be used on SP in an epilogue sequence for \p MF.
+  bool canUseLEAForSPInEpilogue(const MachineFunction &MF) const;
 
-  /// Check that LEA can be use on SP in a prologue sequence for \p MF.
-  bool useLEAForSPInProlog(const MachineFunction &MF) const;
+  /// 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.
+  bool canUseAsEpilogue(const MachineBasicBlock &MBB) const override;
 
 private:
   /// convertArgMovsToPushes - This method tries to convert a call sequence
@@ -108,6 +134,23 @@ private:
                               MachineBasicBlock &MBB,
                               MachineBasicBlock::iterator I, 
                               uint64_t Amount) const;
+
+  uint64_t calculateMaxStackAlign(const MachineFunction &MF) const;
+
+  /// Wraps up getting a CFI index and building a MachineInstr for it.
+  void BuildCFI(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
+                DebugLoc DL, MCCFIInstruction CFIInst) const;
+
+  /// Aligns the stack pointer by ANDing it with -MaxAlign.
+  void BuildStackAlignAND(MachineBasicBlock &MBB,
+                          MachineBasicBlock::iterator MBBI, DebugLoc DL,
+                          uint64_t MaxAlign) const;
+
+  /// Adjusts the stack pointer using LEA, SUB, or ADD.
+  MachineInstrBuilder BuildStackAdjustment(MachineBasicBlock &MBB,
+                                           MachineBasicBlock::iterator MBBI,
+                                           DebugLoc DL, int64_t Offset,
+                                           bool InEpilogue) const;
 };
 
 } // End llvm namespace