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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).

llvm-svn: 131969
This commit is contained in:
Charles Davis 2011-05-24 16:57:53 +00:00
parent fcafc6e3de
commit 97019c709d
3 changed files with 30 additions and 0 deletions
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6
llvm/include/llvm/Target/TargetRegisterInfo.h
View File

@ -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;
}
};

21
llvm/lib/Target/X86/X86RegisterInfo.cpp
View File

@ -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) {

3
llvm/lib/Target/X86/X86RegisterInfo.h
View File

@ -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...
///