void ObjectLoadListener::extractLocalLocations(
const DWARFUnit *CU, const DWARFDebugInfoEntryMinimal *DebugEntry,
std::vector<uint64_t> &Offsets) {
if (DebugEntry->isNULL())
return;
if (DebugEntry->getTag() == dwarf::DW_TAG_formal_parameter ||
DebugEntry->getTag() == dwarf::DW_TAG_variable) {
uint64_t Offset;
// Extract offset for each local found
DWARFFormValue FormValue;
if (DebugEntry->getAttributeValue(CU, dwarf::DW_AT_location, FormValue)) {
Optional<ArrayRef<uint8_t>> FormValues = FormValue.getAsBlock();
Offset = FormValues->back();
}
Offsets.push_back(Offset);
}
const DWARFDebugInfoEntryMinimal *Child = DebugEntry->getFirstChild();
// Extract info for DebugEntry's child and its child's siblings.
while (Child) {
extractLocalLocations(CU, Child, Offsets);
Child = Child->getSibling();
}
}
void ObjectLoadListener::getDebugInfoForLocals(
DWARFContextInMemory &DwarfContext, uint64_t Addr, uint64_t Size) {
for (const auto &CU : DwarfContext.compile_units()) {
const DWARFDebugInfoEntryMinimal *UnitDIE = CU->getUnitDIE(false);
const DWARFDebugInfoEntryMinimal *SubprogramDIE = getSubprogramDIE(UnitDIE);
ICorDebugInfo::RegNum FrameBaseRegister = ICorDebugInfo::REGNUM_COUNT;
DWARFFormValue FormValue;
// Find the frame_base register value
if (SubprogramDIE->getAttributeValue(CU.get(), dwarf::DW_AT_frame_base,
FormValue)) {
Optional<ArrayRef<uint8_t>> FormValues = FormValue.getAsBlock();
FrameBaseRegister = mapDwarfRegisterToRegNum(FormValues->back());
}
if (SubprogramDIE->getAttributeValue(CU.get(), dwarf::DW_AT_low_pc,
FormValue)) {
Optional<uint64_t> FormAddress = FormValue.getAsAddress(CU.get());
// If the Form address doesn't match the address for the function passed
// do not collect debug for locals since they do not go with the current
// function being processed
if (FormAddress.getValue() != Addr) {
return;
}
}
std::vector<uint64_t> Offsets;
extractLocalLocations(CU.get(), SubprogramDIE, Offsets);
// Allocate the array of NativeVarInfo objects that will be sent to the EE
ICorDebugInfo::NativeVarInfo *LocalVars;
unsigned SizeOfArray =
Offsets.size() * sizeof(ICorDebugInfo::NativeVarInfo);
if (SizeOfArray > 0) {
LocalVars =
(ICorDebugInfo::NativeVarInfo *)Context->JitInfo->allocateArray(
SizeOfArray);
unsigned CurrentDebugEntry = 0;
for (auto &Offset : Offsets) {
LocalVars[CurrentDebugEntry].startOffset = Addr;
LocalVars[CurrentDebugEntry].endOffset = Addr + Size;
LocalVars[CurrentDebugEntry].varNumber = CurrentDebugEntry;
// Assume all locals are on the stack
ICorDebugInfo::VarLoc VarLoc;
VarLoc.vlType = ICorDebugInfo::VLT_STK;
VarLoc.vlStk.vlsBaseReg = FrameBaseRegister;
VarLoc.vlStk.vlsOffset = Offset;
LocalVars[CurrentDebugEntry].loc = VarLoc;
CurrentDebugEntry++;
}
CORINFO_METHOD_INFO *MethodInfo = Context->MethodInfo;
CORINFO_METHOD_HANDLE MethodHandle = MethodInfo->ftn;
Context->JitInfo->setVars(MethodHandle, Offsets.size(), LocalVars);
}
}
}
