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Add a method to TargetRegisterInfo to get the register number that the Win64 EH

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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
This commit is contained in:
Charles Davis 2011-05-24 16:57:53 +00:00
parent 13a16083ab
commit 6b918b8466
3 changed files with 30 additions and 0 deletions
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6
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
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
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...
///