in lldb/source/Expression/IRInterpreter.cpp [633:1538]
bool IRInterpreter::Interpret(llvm::Module &module, llvm::Function &function,
llvm::ArrayRef<lldb::addr_t> args,
lldb_private::IRExecutionUnit &execution_unit,
lldb_private::Status &error,
lldb::addr_t stack_frame_bottom,
lldb::addr_t stack_frame_top,
lldb_private::ExecutionContext &exe_ctx) {
lldb_private::Log *log(
lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
if (log) {
std::string s;
raw_string_ostream oss(s);
module.print(oss, nullptr);
oss.flush();
LLDB_LOGF(log, "Module as passed in to IRInterpreter::Interpret: \n\"%s\"",
s.c_str());
}
DataLayout data_layout(&module);
InterpreterStackFrame frame(data_layout, execution_unit, stack_frame_bottom,
stack_frame_top);
if (frame.m_frame_process_address == LLDB_INVALID_ADDRESS) {
error.SetErrorString("Couldn't allocate stack frame");
}
int arg_index = 0;
for (llvm::Function::arg_iterator ai = function.arg_begin(),
ae = function.arg_end();
ai != ae; ++ai, ++arg_index) {
if (args.size() <= static_cast<size_t>(arg_index)) {
error.SetErrorString("Not enough arguments passed in to function");
return false;
}
lldb::addr_t ptr = args[arg_index];
frame.MakeArgument(&*ai, ptr);
}
uint32_t num_insts = 0;
frame.Jump(&function.front());
while (frame.m_ii != frame.m_ie && (++num_insts < 4096)) {
const Instruction *inst = &*frame.m_ii;
LLDB_LOGF(log, "Interpreting %s", PrintValue(inst).c_str());
switch (inst->getOpcode()) {
default:
break;
case Instruction::Add:
case Instruction::Sub:
case Instruction::Mul:
case Instruction::SDiv:
case Instruction::UDiv:
case Instruction::SRem:
case Instruction::URem:
case Instruction::Shl:
case Instruction::LShr:
case Instruction::AShr:
case Instruction::And:
case Instruction::Or:
case Instruction::Xor: {
const BinaryOperator *bin_op = dyn_cast<BinaryOperator>(inst);
if (!bin_op) {
LLDB_LOGF(
log,
"getOpcode() returns %s, but instruction is not a BinaryOperator",
inst->getOpcodeName());
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
Value *lhs = inst->getOperand(0);
Value *rhs = inst->getOperand(1);
lldb_private::Scalar L;
lldb_private::Scalar R;
if (!frame.EvaluateValue(L, lhs, module)) {
LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(lhs).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
if (!frame.EvaluateValue(R, rhs, module)) {
LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(rhs).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
lldb_private::Scalar result;
switch (inst->getOpcode()) {
default:
break;
case Instruction::Add:
result = L + R;
break;
case Instruction::Mul:
result = L * R;
break;
case Instruction::Sub:
result = L - R;
break;
case Instruction::SDiv:
L.MakeSigned();
R.MakeSigned();
result = L / R;
break;
case Instruction::UDiv:
L.MakeUnsigned();
R.MakeUnsigned();
result = L / R;
break;
case Instruction::SRem:
L.MakeSigned();
R.MakeSigned();
result = L % R;
break;
case Instruction::URem:
L.MakeUnsigned();
R.MakeUnsigned();
result = L % R;
break;
case Instruction::Shl:
result = L << R;
break;
case Instruction::AShr:
result = L >> R;
break;
case Instruction::LShr:
result = L;
result.ShiftRightLogical(R);
break;
case Instruction::And:
result = L & R;
break;
case Instruction::Or:
result = L | R;
break;
case Instruction::Xor:
result = L ^ R;
break;
}
frame.AssignValue(inst, result, module);
if (log) {
LLDB_LOGF(log, "Interpreted a %s", inst->getOpcodeName());
LLDB_LOGF(log, " L : %s", frame.SummarizeValue(lhs).c_str());
LLDB_LOGF(log, " R : %s", frame.SummarizeValue(rhs).c_str());
LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str());
}
} break;
case Instruction::Alloca: {
const AllocaInst *alloca_inst = cast<AllocaInst>(inst);
if (alloca_inst->isArrayAllocation()) {
LLDB_LOGF(log,
"AllocaInsts are not handled if isArrayAllocation() is true");
error.SetErrorToGenericError();
error.SetErrorString(unsupported_opcode_error);
return false;
}
// The semantics of Alloca are:
// Create a region R of virtual memory of type T, backed by a data
// buffer
// Create a region P of virtual memory of type T*, backed by a data
// buffer
// Write the virtual address of R into P
Type *T = alloca_inst->getAllocatedType();
Type *Tptr = alloca_inst->getType();
lldb::addr_t R = frame.Malloc(T);
if (R == LLDB_INVALID_ADDRESS) {
LLDB_LOGF(log, "Couldn't allocate memory for an AllocaInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_allocation_error);
return false;
}
lldb::addr_t P = frame.Malloc(Tptr);
if (P == LLDB_INVALID_ADDRESS) {
LLDB_LOGF(log,
"Couldn't allocate the result pointer for an AllocaInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_allocation_error);
return false;
}
lldb_private::Status write_error;
execution_unit.WritePointerToMemory(P, R, write_error);
if (!write_error.Success()) {
LLDB_LOGF(log, "Couldn't write the result pointer for an AllocaInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_write_error);
lldb_private::Status free_error;
execution_unit.Free(P, free_error);
execution_unit.Free(R, free_error);
return false;
}
frame.m_values[alloca_inst] = P;
if (log) {
LLDB_LOGF(log, "Interpreted an AllocaInst");
LLDB_LOGF(log, " R : 0x%" PRIx64, R);
LLDB_LOGF(log, " P : 0x%" PRIx64, P);
}
} break;
case Instruction::BitCast:
case Instruction::ZExt: {
const CastInst *cast_inst = cast<CastInst>(inst);
Value *source = cast_inst->getOperand(0);
lldb_private::Scalar S;
if (!frame.EvaluateValue(S, source, module)) {
LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(source).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
frame.AssignValue(inst, S, module);
} break;
case Instruction::SExt: {
const CastInst *cast_inst = cast<CastInst>(inst);
Value *source = cast_inst->getOperand(0);
lldb_private::Scalar S;
if (!frame.EvaluateValue(S, source, module)) {
LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(source).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
S.MakeSigned();
lldb_private::Scalar S_signextend(S.SLongLong());
frame.AssignValue(inst, S_signextend, module);
} break;
case Instruction::Br: {
const BranchInst *br_inst = cast<BranchInst>(inst);
if (br_inst->isConditional()) {
Value *condition = br_inst->getCondition();
lldb_private::Scalar C;
if (!frame.EvaluateValue(C, condition, module)) {
LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(condition).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
if (!C.IsZero())
frame.Jump(br_inst->getSuccessor(0));
else
frame.Jump(br_inst->getSuccessor(1));
if (log) {
LLDB_LOGF(log, "Interpreted a BrInst with a condition");
LLDB_LOGF(log, " cond : %s",
frame.SummarizeValue(condition).c_str());
}
} else {
frame.Jump(br_inst->getSuccessor(0));
if (log) {
LLDB_LOGF(log, "Interpreted a BrInst with no condition");
}
}
}
continue;
case Instruction::PHI: {
const PHINode *phi_inst = cast<PHINode>(inst);
if (!frame.m_prev_bb) {
LLDB_LOGF(log,
"Encountered PHI node without having jumped from another "
"basic block");
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
Value *value = phi_inst->getIncomingValueForBlock(frame.m_prev_bb);
lldb_private::Scalar result;
if (!frame.EvaluateValue(result, value, module)) {
LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(value).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
frame.AssignValue(inst, result, module);
if (log) {
LLDB_LOGF(log, "Interpreted a %s", inst->getOpcodeName());
LLDB_LOGF(log, " Incoming value : %s",
frame.SummarizeValue(value).c_str());
}
} break;
case Instruction::GetElementPtr: {
const GetElementPtrInst *gep_inst = cast<GetElementPtrInst>(inst);
const Value *pointer_operand = gep_inst->getPointerOperand();
Type *src_elem_ty = gep_inst->getSourceElementType();
lldb_private::Scalar P;
if (!frame.EvaluateValue(P, pointer_operand, module)) {
LLDB_LOGF(log, "Couldn't evaluate %s",
PrintValue(pointer_operand).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
typedef SmallVector<Value *, 8> IndexVector;
typedef IndexVector::iterator IndexIterator;
SmallVector<Value *, 8> indices(gep_inst->idx_begin(),
gep_inst->idx_end());
SmallVector<Value *, 8> const_indices;
for (IndexIterator ii = indices.begin(), ie = indices.end(); ii != ie;
++ii) {
ConstantInt *constant_index = dyn_cast<ConstantInt>(*ii);
if (!constant_index) {
lldb_private::Scalar I;
if (!frame.EvaluateValue(I, *ii, module)) {
LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(*ii).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
LLDB_LOGF(log, "Evaluated constant index %s as %llu",
PrintValue(*ii).c_str(), I.ULongLong(LLDB_INVALID_ADDRESS));
constant_index = cast<ConstantInt>(ConstantInt::get(
(*ii)->getType(), I.ULongLong(LLDB_INVALID_ADDRESS)));
}
const_indices.push_back(constant_index);
}
uint64_t offset =
data_layout.getIndexedOffsetInType(src_elem_ty, const_indices);
lldb_private::Scalar Poffset = P + offset;
frame.AssignValue(inst, Poffset, module);
if (log) {
LLDB_LOGF(log, "Interpreted a GetElementPtrInst");
LLDB_LOGF(log, " P : %s",
frame.SummarizeValue(pointer_operand).c_str());
LLDB_LOGF(log, " Poffset : %s", frame.SummarizeValue(inst).c_str());
}
} break;
case Instruction::ICmp: {
const ICmpInst *icmp_inst = cast<ICmpInst>(inst);
CmpInst::Predicate predicate = icmp_inst->getPredicate();
Value *lhs = inst->getOperand(0);
Value *rhs = inst->getOperand(1);
lldb_private::Scalar L;
lldb_private::Scalar R;
if (!frame.EvaluateValue(L, lhs, module)) {
LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(lhs).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
if (!frame.EvaluateValue(R, rhs, module)) {
LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(rhs).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
lldb_private::Scalar result;
switch (predicate) {
default:
return false;
case CmpInst::ICMP_EQ:
result = (L == R);
break;
case CmpInst::ICMP_NE:
result = (L != R);
break;
case CmpInst::ICMP_UGT:
L.MakeUnsigned();
R.MakeUnsigned();
result = (L > R);
break;
case CmpInst::ICMP_UGE:
L.MakeUnsigned();
R.MakeUnsigned();
result = (L >= R);
break;
case CmpInst::ICMP_ULT:
L.MakeUnsigned();
R.MakeUnsigned();
result = (L < R);
break;
case CmpInst::ICMP_ULE:
L.MakeUnsigned();
R.MakeUnsigned();
result = (L <= R);
break;
case CmpInst::ICMP_SGT:
L.MakeSigned();
R.MakeSigned();
result = (L > R);
break;
case CmpInst::ICMP_SGE:
L.MakeSigned();
R.MakeSigned();
result = (L >= R);
break;
case CmpInst::ICMP_SLT:
L.MakeSigned();
R.MakeSigned();
result = (L < R);
break;
case CmpInst::ICMP_SLE:
L.MakeSigned();
R.MakeSigned();
result = (L <= R);
break;
}
frame.AssignValue(inst, result, module);
if (log) {
LLDB_LOGF(log, "Interpreted an ICmpInst");
LLDB_LOGF(log, " L : %s", frame.SummarizeValue(lhs).c_str());
LLDB_LOGF(log, " R : %s", frame.SummarizeValue(rhs).c_str());
LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str());
}
} break;
case Instruction::IntToPtr: {
const IntToPtrInst *int_to_ptr_inst = cast<IntToPtrInst>(inst);
Value *src_operand = int_to_ptr_inst->getOperand(0);
lldb_private::Scalar I;
if (!frame.EvaluateValue(I, src_operand, module)) {
LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(src_operand).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
frame.AssignValue(inst, I, module);
if (log) {
LLDB_LOGF(log, "Interpreted an IntToPtr");
LLDB_LOGF(log, " Src : %s", frame.SummarizeValue(src_operand).c_str());
LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str());
}
} break;
case Instruction::PtrToInt: {
const PtrToIntInst *ptr_to_int_inst = cast<PtrToIntInst>(inst);
Value *src_operand = ptr_to_int_inst->getOperand(0);
lldb_private::Scalar I;
if (!frame.EvaluateValue(I, src_operand, module)) {
LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(src_operand).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
frame.AssignValue(inst, I, module);
if (log) {
LLDB_LOGF(log, "Interpreted a PtrToInt");
LLDB_LOGF(log, " Src : %s", frame.SummarizeValue(src_operand).c_str());
LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str());
}
} break;
case Instruction::Trunc: {
const TruncInst *trunc_inst = cast<TruncInst>(inst);
Value *src_operand = trunc_inst->getOperand(0);
lldb_private::Scalar I;
if (!frame.EvaluateValue(I, src_operand, module)) {
LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(src_operand).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
frame.AssignValue(inst, I, module);
if (log) {
LLDB_LOGF(log, "Interpreted a Trunc");
LLDB_LOGF(log, " Src : %s", frame.SummarizeValue(src_operand).c_str());
LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str());
}
} break;
case Instruction::Load: {
const LoadInst *load_inst = cast<LoadInst>(inst);
// The semantics of Load are:
// Create a region D that will contain the loaded data
// Resolve the region P containing a pointer
// Dereference P to get the region R that the data should be loaded from
// Transfer a unit of type type(D) from R to D
const Value *pointer_operand = load_inst->getPointerOperand();
Type *pointer_ty = pointer_operand->getType();
PointerType *pointer_ptr_ty = dyn_cast<PointerType>(pointer_ty);
if (!pointer_ptr_ty) {
LLDB_LOGF(log, "getPointerOperand()->getType() is not a PointerType");
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
Type *target_ty = pointer_ptr_ty->getElementType();
lldb::addr_t D = frame.ResolveValue(load_inst, module);
lldb::addr_t P = frame.ResolveValue(pointer_operand, module);
if (D == LLDB_INVALID_ADDRESS) {
LLDB_LOGF(log, "LoadInst's value doesn't resolve to anything");
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
if (P == LLDB_INVALID_ADDRESS) {
LLDB_LOGF(log, "LoadInst's pointer doesn't resolve to anything");
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
lldb::addr_t R;
lldb_private::Status read_error;
execution_unit.ReadPointerFromMemory(&R, P, read_error);
if (!read_error.Success()) {
LLDB_LOGF(log, "Couldn't read the address to be loaded for a LoadInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_read_error);
return false;
}
size_t target_size = data_layout.getTypeStoreSize(target_ty);
lldb_private::DataBufferHeap buffer(target_size, 0);
read_error.Clear();
execution_unit.ReadMemory(buffer.GetBytes(), R, buffer.GetByteSize(),
read_error);
if (!read_error.Success()) {
LLDB_LOGF(log, "Couldn't read from a region on behalf of a LoadInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_read_error);
return false;
}
lldb_private::Status write_error;
execution_unit.WriteMemory(D, buffer.GetBytes(), buffer.GetByteSize(),
write_error);
if (!write_error.Success()) {
LLDB_LOGF(log, "Couldn't write to a region on behalf of a LoadInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_write_error);
return false;
}
if (log) {
LLDB_LOGF(log, "Interpreted a LoadInst");
LLDB_LOGF(log, " P : 0x%" PRIx64, P);
LLDB_LOGF(log, " R : 0x%" PRIx64, R);
LLDB_LOGF(log, " D : 0x%" PRIx64, D);
}
} break;
case Instruction::Ret: {
return true;
}
case Instruction::Store: {
const StoreInst *store_inst = cast<StoreInst>(inst);
// The semantics of Store are:
// Resolve the region D containing the data to be stored
// Resolve the region P containing a pointer
// Dereference P to get the region R that the data should be stored in
// Transfer a unit of type type(D) from D to R
const Value *value_operand = store_inst->getValueOperand();
const Value *pointer_operand = store_inst->getPointerOperand();
Type *pointer_ty = pointer_operand->getType();
PointerType *pointer_ptr_ty = dyn_cast<PointerType>(pointer_ty);
if (!pointer_ptr_ty)
return false;
Type *target_ty = pointer_ptr_ty->getElementType();
lldb::addr_t D = frame.ResolveValue(value_operand, module);
lldb::addr_t P = frame.ResolveValue(pointer_operand, module);
if (D == LLDB_INVALID_ADDRESS) {
LLDB_LOGF(log, "StoreInst's value doesn't resolve to anything");
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
if (P == LLDB_INVALID_ADDRESS) {
LLDB_LOGF(log, "StoreInst's pointer doesn't resolve to anything");
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
lldb::addr_t R;
lldb_private::Status read_error;
execution_unit.ReadPointerFromMemory(&R, P, read_error);
if (!read_error.Success()) {
LLDB_LOGF(log, "Couldn't read the address to be loaded for a LoadInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_read_error);
return false;
}
size_t target_size = data_layout.getTypeStoreSize(target_ty);
lldb_private::DataBufferHeap buffer(target_size, 0);
read_error.Clear();
execution_unit.ReadMemory(buffer.GetBytes(), D, buffer.GetByteSize(),
read_error);
if (!read_error.Success()) {
LLDB_LOGF(log, "Couldn't read from a region on behalf of a StoreInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_read_error);
return false;
}
lldb_private::Status write_error;
execution_unit.WriteMemory(R, buffer.GetBytes(), buffer.GetByteSize(),
write_error);
if (!write_error.Success()) {
LLDB_LOGF(log, "Couldn't write to a region on behalf of a StoreInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_write_error);
return false;
}
if (log) {
LLDB_LOGF(log, "Interpreted a StoreInst");
LLDB_LOGF(log, " D : 0x%" PRIx64, D);
LLDB_LOGF(log, " P : 0x%" PRIx64, P);
LLDB_LOGF(log, " R : 0x%" PRIx64, R);
}
} break;
case Instruction::Call: {
const CallInst *call_inst = cast<CallInst>(inst);
if (CanIgnoreCall(call_inst))
break;
// Get the return type
llvm::Type *returnType = call_inst->getType();
if (returnType == nullptr) {
error.SetErrorToGenericError();
error.SetErrorString("unable to access return type");
return false;
}
// Work with void, integer and pointer return types
if (!returnType->isVoidTy() && !returnType->isIntegerTy() &&
!returnType->isPointerTy()) {
error.SetErrorToGenericError();
error.SetErrorString("return type is not supported");
return false;
}
// Check we can actually get a thread
if (exe_ctx.GetThreadPtr() == nullptr) {
error.SetErrorToGenericError();
error.SetErrorString("unable to acquire thread");
return false;
}
// Make sure we have a valid process
if (!exe_ctx.GetProcessPtr()) {
error.SetErrorToGenericError();
error.SetErrorString("unable to get the process");
return false;
}
// Find the address of the callee function
lldb_private::Scalar I;
const llvm::Value *val = call_inst->getCalledOperand();
if (!frame.EvaluateValue(I, val, module)) {
error.SetErrorToGenericError();
error.SetErrorString("unable to get address of function");
return false;
}
lldb_private::Address funcAddr(I.ULongLong(LLDB_INVALID_ADDRESS));
lldb_private::DiagnosticManager diagnostics;
lldb_private::EvaluateExpressionOptions options;
// We generally receive a function pointer which we must dereference
llvm::Type *prototype = val->getType();
if (!prototype->isPointerTy()) {
error.SetErrorToGenericError();
error.SetErrorString("call need function pointer");
return false;
}
// Dereference the function pointer
prototype = prototype->getPointerElementType();
if (!(prototype->isFunctionTy() || prototype->isFunctionVarArg())) {
error.SetErrorToGenericError();
error.SetErrorString("call need function pointer");
return false;
}
// Find number of arguments
const int numArgs = call_inst->arg_size();
// We work with a fixed array of 16 arguments which is our upper limit
static lldb_private::ABI::CallArgument rawArgs[16];
if (numArgs >= 16) {
error.SetErrorToGenericError();
error.SetErrorString("function takes too many arguments");
return false;
}
// Push all function arguments to the argument list that will be passed
// to the call function thread plan
for (int i = 0; i < numArgs; i++) {
// Get details of this argument
llvm::Value *arg_op = call_inst->getArgOperand(i);
llvm::Type *arg_ty = arg_op->getType();
// Ensure that this argument is an supported type
if (!arg_ty->isIntegerTy() && !arg_ty->isPointerTy()) {
error.SetErrorToGenericError();
error.SetErrorStringWithFormat("argument %d must be integer type", i);
return false;
}
// Extract the arguments value
lldb_private::Scalar tmp_op = 0;
if (!frame.EvaluateValue(tmp_op, arg_op, module)) {
error.SetErrorToGenericError();
error.SetErrorStringWithFormat("unable to evaluate argument %d", i);
return false;
}
// Check if this is a string literal or constant string pointer
if (arg_ty->isPointerTy()) {
lldb::addr_t addr = tmp_op.ULongLong();
size_t dataSize = 0;
bool Success = execution_unit.GetAllocSize(addr, dataSize);
(void)Success;
assert(Success &&
"unable to locate host data for transfer to device");
// Create the required buffer
rawArgs[i].size = dataSize;
rawArgs[i].data_up.reset(new uint8_t[dataSize + 1]);
// Read string from host memory
execution_unit.ReadMemory(rawArgs[i].data_up.get(), addr, dataSize,
error);
assert(!error.Fail() &&
"we have failed to read the string from memory");
// Add null terminator
rawArgs[i].data_up[dataSize] = '\0';
rawArgs[i].type = lldb_private::ABI::CallArgument::HostPointer;
} else /* if ( arg_ty->isPointerTy() ) */
{
rawArgs[i].type = lldb_private::ABI::CallArgument::TargetValue;
// Get argument size in bytes
rawArgs[i].size = arg_ty->getIntegerBitWidth() / 8;
// Push value into argument list for thread plan
rawArgs[i].value = tmp_op.ULongLong();
}
}
// Pack the arguments into an llvm::array
llvm::ArrayRef<lldb_private::ABI::CallArgument> args(rawArgs, numArgs);
// Setup a thread plan to call the target function
lldb::ThreadPlanSP call_plan_sp(
new lldb_private::ThreadPlanCallFunctionUsingABI(
exe_ctx.GetThreadRef(), funcAddr, *prototype, *returnType, args,
options));
// Check if the plan is valid
lldb_private::StreamString ss;
if (!call_plan_sp || !call_plan_sp->ValidatePlan(&ss)) {
error.SetErrorToGenericError();
error.SetErrorStringWithFormat(
"unable to make ThreadPlanCallFunctionUsingABI for 0x%llx",
I.ULongLong());
return false;
}
exe_ctx.GetProcessPtr()->SetRunningUserExpression(true);
// Execute the actual function call thread plan
lldb::ExpressionResults res = exe_ctx.GetProcessRef().RunThreadPlan(
exe_ctx, call_plan_sp, options, diagnostics);
// Check that the thread plan completed successfully
if (res != lldb::ExpressionResults::eExpressionCompleted) {
error.SetErrorToGenericError();
error.SetErrorString("ThreadPlanCallFunctionUsingABI failed");
return false;
}
exe_ctx.GetProcessPtr()->SetRunningUserExpression(false);
// Void return type
if (returnType->isVoidTy()) {
// Cant assign to void types, so we leave the frame untouched
} else
// Integer or pointer return type
if (returnType->isIntegerTy() || returnType->isPointerTy()) {
// Get the encapsulated return value
lldb::ValueObjectSP retVal = call_plan_sp.get()->GetReturnValueObject();
lldb_private::Scalar returnVal = -1;
lldb_private::ValueObject *vobj = retVal.get();
// Check if the return value is valid
if (vobj == nullptr || !retVal) {
error.SetErrorToGenericError();
error.SetErrorString("unable to get the return value");
return false;
}
// Extract the return value as a integer
lldb_private::Value &value = vobj->GetValue();
returnVal = value.GetScalar();
// Push the return value as the result
frame.AssignValue(inst, returnVal, module);
}
} break;
}
++frame.m_ii;
}
if (num_insts >= 4096) {
error.SetErrorToGenericError();
error.SetErrorString(infinite_loop_error);
return false;
}
return false;
}