Summary:
If the backend does not define LLVM/DWARF register mappings, the associated
variables are undefined since the map initializer is called by auto-generated
TableGen routines. This patch initializes the pointers and sizes to nullptr
and zero, respectively, and checks that they are valid before searching
for a mapping.
Reviewers: grosbach, dschuff
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D23458
llvm-svn: 278574
NumSubRegIndices = NumIndices;
SubRegIdxRanges = SubIdxRanges;
RegEncodingTable = RET;
+
+ // Initialize DWARF register mapping variables
+ EHL2DwarfRegs = nullptr;
+ EHL2DwarfRegsSize = 0;
+ L2DwarfRegs = nullptr;
+ L2DwarfRegsSize = 0;
+ EHDwarf2LRegs = nullptr;
+ EHDwarf2LRegsSize = 0;
+ Dwarf2LRegs = nullptr;
+ Dwarf2LRegsSize = 0;
}
/// \brief Used to initialize LLVM register to Dwarf
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)
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");