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Add target a target hook to get the register number used by the compact unwind 

encoding for the registers it knows about. Return -1 if it can't handle that
register.

llvm-svn: 134202
This commit is contained in:
Bill Wendling 2011-06-30 23:20:32 +00:00
parent abe5f97634
commit b403f0c4ed
4 changed files with 29 additions and 0 deletions
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4
llvm/include/llvm/Target/TargetAsmInfo.h
View File

@ -106,6 +106,10 @@ public:
int getSEHRegNum(unsigned RegNum) const {
return TRI->getSEHRegNum(RegNum);
}
int getCompactUnwindRegNum(unsigned RegNum) const {
return TRI->getCompactUnwindRegNum(RegNum);
}
};
}

6
llvm/include/llvm/Target/TargetRegisterInfo.h
View File

@ -720,6 +720,12 @@ public:
virtual int getSEHRegNum(unsigned i) const {
return i;
}
/// getCompactUnwindRegNum - This function maps the register to the number for
/// compact unwind encoding. Return -1 if the register isn't valid.
virtual int getCompactUnwindRegNum(unsigned) const {
return -1;
}
};

15
llvm/lib/Target/X86/X86RegisterInfo.cpp
View File

@ -105,6 +105,21 @@ int X86RegisterInfo::getLLVMRegNum(unsigned DwarfRegNo, bool isEH) const {
return X86GenRegisterInfo::getLLVMRegNumFull(DwarfRegNo, Flavour);
}
/// getCompactUnwindRegNum - This function maps the register to the number for
/// compact unwind encoding. Return -1 if the register isn't valid.
int X86RegisterInfo::getCompactUnwindRegNum(unsigned RegNum) const {
switch (RegNum) {
case X86::EBX: case X86::RBX: return 1;
case X86::ECX: case X86::RCX: return 2;
case X86::EDX: case X86::RDX: return 3;
case X86::EDI: case X86::RDI: return 4;
case X86::ESI: case X86::RSI: return 5;
case X86::EBP: case X86::RBP: return 6;
}
return -1;
}
int
X86RegisterInfo::getSEHRegNum(unsigned i) const {
int reg = getX86RegNum(i);

4
llvm/lib/Target/X86/X86RegisterInfo.h
View File

@ -81,6 +81,10 @@ public:
// FIXME: This should be tablegen'd like getDwarfRegNum is
int getSEHRegNum(unsigned i) const;
/// getCompactUnwindRegNum - This function maps the register to the number for
/// compact unwind encoding. Return -1 if the register isn't valid.
int getCompactUnwindRegNum(unsigned RegNum) const;
/// Code Generation virtual methods...
///