mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-20 19:42:54 +02:00
9a7dac2fce
r230670 introduced a step to map EH register numbers to standard DWARF register numbers. This failed to consider the case when a user .cfi_* directive uses an integer literal rather than a register name, to specify a DWARF register number that has no corresponding LLVM register number (e.g. a special register that the compiler and assembler have no name for). Fixes PR34028. Patch by Roland McGrath Differential Revision: https://reviews.llvm.org/D36493 llvm-svn: 319586
133 lines
4.8 KiB
C++
133 lines
4.8 KiB
C++
//===- MC/MCRegisterInfo.cpp - Target Register Description ----------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements MCRegisterInfo functions.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/MC/MCRegisterInfo.h"
|
|
#include "llvm/ADT/DenseMap.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
#include <algorithm>
|
|
#include <cassert>
|
|
#include <cstdint>
|
|
|
|
using namespace llvm;
|
|
|
|
unsigned MCRegisterInfo::getMatchingSuperReg(unsigned Reg, unsigned SubIdx,
|
|
const MCRegisterClass *RC) const {
|
|
for (MCSuperRegIterator Supers(Reg, this); Supers.isValid(); ++Supers)
|
|
if (RC->contains(*Supers) && Reg == getSubReg(*Supers, SubIdx))
|
|
return *Supers;
|
|
return 0;
|
|
}
|
|
|
|
unsigned MCRegisterInfo::getSubReg(unsigned Reg, unsigned Idx) const {
|
|
assert(Idx && Idx < getNumSubRegIndices() &&
|
|
"This is not a subregister index");
|
|
// Get a pointer to the corresponding SubRegIndices list. This list has the
|
|
// name of each sub-register in the same order as MCSubRegIterator.
|
|
const uint16_t *SRI = SubRegIndices + get(Reg).SubRegIndices;
|
|
for (MCSubRegIterator Subs(Reg, this); Subs.isValid(); ++Subs, ++SRI)
|
|
if (*SRI == Idx)
|
|
return *Subs;
|
|
return 0;
|
|
}
|
|
|
|
unsigned MCRegisterInfo::getSubRegIndex(unsigned Reg, unsigned SubReg) const {
|
|
assert(SubReg && SubReg < getNumRegs() && "This is not a register");
|
|
// Get a pointer to the corresponding SubRegIndices list. This list has the
|
|
// name of each sub-register in the same order as MCSubRegIterator.
|
|
const uint16_t *SRI = SubRegIndices + get(Reg).SubRegIndices;
|
|
for (MCSubRegIterator Subs(Reg, this); Subs.isValid(); ++Subs, ++SRI)
|
|
if (*Subs == SubReg)
|
|
return *SRI;
|
|
return 0;
|
|
}
|
|
|
|
unsigned MCRegisterInfo::getSubRegIdxSize(unsigned Idx) const {
|
|
assert(Idx && Idx < getNumSubRegIndices() &&
|
|
"This is not a subregister index");
|
|
return SubRegIdxRanges[Idx].Size;
|
|
}
|
|
|
|
unsigned MCRegisterInfo::getSubRegIdxOffset(unsigned Idx) const {
|
|
assert(Idx && Idx < getNumSubRegIndices() &&
|
|
"This is not a subregister index");
|
|
return SubRegIdxRanges[Idx].Offset;
|
|
}
|
|
|
|
int MCRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
|
|
const DwarfLLVMRegPair *M = isEH ? EHL2DwarfRegs : L2DwarfRegs;
|
|
unsigned Size = isEH ? EHL2DwarfRegsSize : L2DwarfRegsSize;
|
|
|
|
if (!M)
|
|
return -1;
|
|
DwarfLLVMRegPair Key = { RegNum, 0 };
|
|
const DwarfLLVMRegPair *I = std::lower_bound(M, M+Size, Key);
|
|
if (I == M+Size || I->FromReg != RegNum)
|
|
return -1;
|
|
return I->ToReg;
|
|
}
|
|
|
|
int MCRegisterInfo::getLLVMRegNum(unsigned RegNum, bool isEH) const {
|
|
const DwarfLLVMRegPair *M = isEH ? EHDwarf2LRegs : Dwarf2LRegs;
|
|
unsigned Size = isEH ? EHDwarf2LRegsSize : Dwarf2LRegsSize;
|
|
|
|
if (!M)
|
|
return -1;
|
|
DwarfLLVMRegPair Key = { RegNum, 0 };
|
|
const DwarfLLVMRegPair *I = std::lower_bound(M, M+Size, Key);
|
|
assert(I != M+Size && I->FromReg == RegNum && "Invalid RegNum");
|
|
return I->ToReg;
|
|
}
|
|
|
|
int MCRegisterInfo::getLLVMRegNumFromEH(unsigned RegNum) const {
|
|
const DwarfLLVMRegPair *M = EHDwarf2LRegs;
|
|
unsigned Size = EHDwarf2LRegsSize;
|
|
|
|
if (!M)
|
|
return -1;
|
|
DwarfLLVMRegPair Key = { RegNum, 0 };
|
|
const DwarfLLVMRegPair *I = std::lower_bound(M, M+Size, Key);
|
|
if (I == M+Size || I->FromReg != RegNum)
|
|
return -1;
|
|
return I->ToReg;
|
|
}
|
|
|
|
int MCRegisterInfo::getDwarfRegNumFromDwarfEHRegNum(unsigned RegNum) const {
|
|
// On ELF platforms, DWARF EH register numbers are the same as DWARF
|
|
// other register numbers. On Darwin x86, they differ and so need to be
|
|
// mapped. The .cfi_* directives accept integer literals as well as
|
|
// register names and should generate exactly what the assembly code
|
|
// asked for, so there might be DWARF/EH register numbers that don't have
|
|
// a corresponding LLVM register number at all. So if we can't map the
|
|
// EH register number to an LLVM register number, assume it's just a
|
|
// valid DWARF register number as is.
|
|
int LRegNum = getLLVMRegNumFromEH(RegNum);
|
|
if (LRegNum != -1)
|
|
return getDwarfRegNum(LRegNum, false);
|
|
return RegNum;
|
|
}
|
|
|
|
int MCRegisterInfo::getSEHRegNum(unsigned RegNum) const {
|
|
const DenseMap<unsigned, int>::const_iterator I = L2SEHRegs.find(RegNum);
|
|
if (I == L2SEHRegs.end()) return (int)RegNum;
|
|
return I->second;
|
|
}
|
|
|
|
int MCRegisterInfo::getCodeViewRegNum(unsigned RegNum) const {
|
|
if (L2CVRegs.empty())
|
|
report_fatal_error("target does not implement codeview register mapping");
|
|
const DenseMap<unsigned, int>::const_iterator I = L2CVRegs.find(RegNum);
|
|
if (I == L2CVRegs.end())
|
|
report_fatal_error("unknown codeview register");
|
|
return I->second;
|
|
}
|