From: Chris Lattner <sabre@nondot.org>
Date: Thu, 12 Aug 2004 19:01:55 +0000 (+0000)
Subject: Allow targets to specify particular stack slots that certain physregs must
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=09431e187f9abd45af08461df728204ee9731fd7;p=oota-llvm.git

Allow targets to specify particular stack slots that certain physregs must
be spilled into.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15702 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/Target/TargetFrameInfo.h b/include/llvm/Target/TargetFrameInfo.h
index a85cd872406..c727561ab2a 100644
--- a/include/llvm/Target/TargetFrameInfo.h
+++ b/include/llvm/Target/TargetFrameInfo.h
@@ -14,6 +14,8 @@
 #ifndef LLVM_TARGET_TARGETFRAMEINFO_H
 #define LLVM_TARGET_TARGETFRAMEINFO_H
 
+#include <utility>
+
 namespace llvm {
 
 class MachineFunction;
@@ -56,6 +58,21 @@ public:
   ///
   int getOffsetOfLocalArea() const { return LocalAreaOffset; }
 
+  /// getCalleeSaveSpillSlots - This method returns a pointer to an array of
+  /// pairs, that contains an entry for each callee save register that must be
+  /// spilled to a particular stack location if it is spilled.
+  ///
+  /// Each entry in this array contains a <register,offset> pair, indicating the
+  /// fixed offset from the incoming stack pointer that each register should be
+  /// spilled at.  If a register is not listed here, the code generator is
+  /// allowed to spill it anywhere it chooses.
+  /// 
+  virtual std::pair<unsigned, int> *
+  getCalleeSaveSpillSlots(unsigned &NumEntries) const {
+    NumEntries = 0;
+    return 0;
+  }
+  
   //===--------------------------------------------------------------------===//
   // These methods provide details of the stack frame used by Sparc, thus they
   // are Sparc specific.