diff options
Diffstat (limited to 'llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp index a3777438..2cf31ca 100644 --- a/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp +++ b/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp @@ -1343,7 +1343,17 @@ void CodeViewDebug::calculateRanges( Optional<DbgVariableLocation> Location = DbgVariableLocation::extractFromMachineInstruction(*DVInst); if (!Location) + { + // When we don't have a location this is usually because LLVM has + // transformed it into a constant and we only have an llvm.dbg.value. We + // can't represent these well in CodeView since S_LOCAL only works on + // registers and memory locations. Instead, we will pretend this to be a + // constant value to at least have it show up in the debugger. + auto Op = DVInst->getDebugOperand(0); + if (Op.isImm()) + Var.ConstantValue = APSInt(APInt(64, Op.getImm()), false); continue; + } // CodeView can only express variables in register and variables in memory // at a constant offset from a register. However, for variables passed @@ -2788,9 +2798,19 @@ void CodeViewDebug::emitLocalVariableList(const FunctionInfo &FI, emitLocalVariable(FI, *L); // Next emit all non-parameters in the order that we found them. - for (const LocalVariable &L : Locals) - if (!L.DIVar->isParameter()) - emitLocalVariable(FI, L); + for (const LocalVariable &L : Locals) { + if (!L.DIVar->isParameter()) { + if (L.ConstantValue) { + // If ConstantValue is set we will emit it as a S_CONSTANT instead of a + // S_LOCAL in order to be able to represent it at all. + const DIType *Ty = L.DIVar->getType(); + APSInt Val(L.ConstantValue.value()); + emitConstantSymbolRecord(Ty, Val, std::string(L.DIVar->getName())); + } else { + emitLocalVariable(FI, L); + } + } + } } void CodeViewDebug::emitLocalVariable(const FunctionInfo &FI, |