From: Charles Davis <cdavis@mines.edu>
Date: Tue, 24 May 2011 16:57:53 +0000 (+0000)
Subject: Add a method to TargetRegisterInfo to get the register number that the Win64 EH
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=6b918b84661687f7b5fc92dabd6d58e258bf39f2;p=oota-llvm.git

Add a method to TargetRegisterInfo to get the register number that the Win64 EH
scheme uses internally. Implement it for x86 (the only architecture that LLVM
supports for which this matters right now).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131969 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/Target/TargetRegisterInfo.h b/include/llvm/Target/TargetRegisterInfo.h
index afa395f3d73..2b13483058d 100644
--- a/include/llvm/Target/TargetRegisterInfo.h
+++ b/include/llvm/Target/TargetRegisterInfo.h
@@ -809,6 +809,12 @@ public:
   /// getRARegister - This method should return the register where the return
   /// address can be found.
   virtual unsigned getRARegister() const = 0;
+
+  /// getSEHRegNum - Map a target register to an equivalent SEH register
+  /// number.  Returns -1 if there is no equivalent value.
+  virtual int getSEHRegNum(unsigned i) const {
+    return i;
+  }
 };
 
 
diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp
index f87745ff7c3..fc1b8cf08c1 100644
--- a/lib/Target/X86/X86RegisterInfo.cpp
+++ b/lib/Target/X86/X86RegisterInfo.cpp
@@ -96,6 +96,27 @@ int X86RegisterInfo::getDwarfRegNum(unsigned RegNo, bool isEH) const {
   return X86GenRegisterInfo::getDwarfRegNumFull(RegNo, Flavour);
 }
 
+int
+X86RegisterInfo::getSEHRegNum(unsigned i) const {
+  int reg = getX86RegNum(i);
+  switch (i) {
+  case X86::R8:  case X86::R8D:  case X86::R8W:  case X86::R8B:
+  case X86::R9:  case X86::R9D:  case X86::R9W:  case X86::R9B:
+  case X86::R10: case X86::R10D: case X86::R10W: case X86::R10B:
+  case X86::R11: case X86::R11D: case X86::R11W: case X86::R11B:
+  case X86::R12: case X86::R12D: case X86::R12W: case X86::R12B:
+  case X86::R13: case X86::R13D: case X86::R13W: case X86::R13B:
+  case X86::R14: case X86::R14D: case X86::R14W: case X86::R14B:
+  case X86::R15: case X86::R15D: case X86::R15W: case X86::R15B:
+  case X86::XMM8: case X86::XMM9: case X86::XMM10: case X86::XMM11:
+  case X86::XMM12: case X86::XMM13: case X86::XMM14: case X86::XMM15:
+  case X86::YMM8: case X86::YMM9: case X86::YMM10: case X86::YMM11:
+  case X86::YMM12: case X86::YMM13: case X86::YMM14: case X86::YMM15:
+    reg += 8;
+  }
+  return reg;
+}
+
 /// getX86RegNum - This function maps LLVM register identifiers to their X86
 /// specific numbering, which is used in various places encoding instructions.
 unsigned X86RegisterInfo::getX86RegNum(unsigned RegNo) {
diff --git a/lib/Target/X86/X86RegisterInfo.h b/lib/Target/X86/X86RegisterInfo.h
index 9970c52c3e7..268691a5a41 100644
--- a/lib/Target/X86/X86RegisterInfo.h
+++ b/lib/Target/X86/X86RegisterInfo.h
@@ -81,6 +81,9 @@ public:
   /// (created by TableGen) for target dependencies.
   int getDwarfRegNum(unsigned RegNum, bool isEH) const;
 
+  // FIXME: This should be tablegen'd like getDwarfRegNum is
+  int getSEHRegNum(unsigned i) const;
+
   /// Code Generation virtual methods...
   ///