//===-- IRInterpreter.cpp ---------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/Core/DataExtractor.h"
#include "lldb/Core/Error.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/Scalar.h"
#include "lldb/Core/StreamString.h"
#include "lldb/Expression/IRMemoryMap.h"
#include "lldb/Expression/IRInterpreter.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/raw_ostream.h"
#include <map>
using namespace llvm;
static std::string
PrintValue(const Value *value, bool truncate = false)
{
std::string s;
raw_string_ostream rso(s);
value->print(rso);
rso.flush();
if (truncate)
s.resize(s.length() - 1);
size_t offset;
while ((offset = s.find('\n')) != s.npos)
s.erase(offset, 1);
while (s[0] == ' ' || s[0] == '\t')
s.erase(0, 1);
return s;
}
static std::string
PrintType(const Type *type, bool truncate = false)
{
std::string s;
raw_string_ostream rso(s);
type->print(rso);
rso.flush();
if (truncate)
s.resize(s.length() - 1);
return s;
}
class InterpreterStackFrame
{
public:
typedef std::map <const Value*, lldb::addr_t> ValueMap;
ValueMap m_values;
DataLayout &m_target_data;
lldb_private::IRMemoryMap &m_memory_map;
const BasicBlock *m_bb;
BasicBlock::const_iterator m_ii;
BasicBlock::const_iterator m_ie;
lldb::addr_t m_frame_process_address;
size_t m_frame_size;
lldb::addr_t m_stack_pointer;
lldb::ByteOrder m_byte_order;
size_t m_addr_byte_size;
InterpreterStackFrame (DataLayout &target_data,
lldb_private::IRMemoryMap &memory_map,
lldb::addr_t stack_frame_bottom,
lldb::addr_t stack_frame_top) :
m_target_data (target_data),
m_memory_map (memory_map)
{
m_byte_order = (target_data.isLittleEndian() ? lldb::eByteOrderLittle : lldb::eByteOrderBig);
m_addr_byte_size = (target_data.getPointerSize(0));
m_frame_process_address = stack_frame_bottom;
m_frame_size = stack_frame_top - stack_frame_bottom;
m_stack_pointer = stack_frame_top;
}
~InterpreterStackFrame ()
{
}
void Jump (const BasicBlock *bb)
{
m_bb = bb;
m_ii = m_bb->begin();
m_ie = m_bb->end();
}
std::string SummarizeValue (const Value *value)
{
lldb_private::StreamString ss;
ss.Printf("%s", PrintValue(value).c_str());
ValueMap::iterator i = m_values.find(value);
if (i != m_values.end())
{
lldb::addr_t addr = i->second;
ss.Printf(" 0x%llx", (unsigned long long)addr);
}
return ss.GetString();
}
bool AssignToMatchType (lldb_private::Scalar &scalar, uint64_t u64value, Type *type)
{
size_t type_size = m_target_data.getTypeStoreSize(type);
switch (type_size)
{
case 1:
scalar = (uint8_t)u64value;
break;
case 2:
scalar = (uint16_t)u64value;
break;
case 4:
scalar = (uint32_t)u64value;
break;
case 8:
scalar = (uint64_t)u64value;
break;
default:
return false;
}
return true;
}
bool EvaluateValue (lldb_private::Scalar &scalar, const Value *value, Module &module)
{
const Constant *constant = dyn_cast<Constant>(value);
if (constant)
{
APInt value_apint;
if (!ResolveConstantValue(value_apint, constant))
return false;
return AssignToMatchType(scalar, value_apint.getLimitedValue(), value->getType());
}
else
{
lldb::addr_t process_address = ResolveValue(value, module);
size_t value_size = m_target_data.getTypeStoreSize(value->getType());
lldb_private::DataExtractor value_extractor;
lldb_private::Error extract_error;
m_memory_map.GetMemoryData(value_extractor, process_address, value_size, extract_error);
if (!extract_error.Success())
return false;
lldb::offset_t offset = 0;
if (value_size == 1 || value_size == 2 || value_size == 4 || value_size == 8)
{
uint64_t u64value = value_extractor.GetMaxU64(&offset, value_size);
return AssignToMatchType(scalar, u64value, value->getType());
}
}
return false;
}
bool AssignValue (const Value *value, lldb_private::Scalar &scalar, Module &module)
{
lldb::addr_t process_address = ResolveValue (value, module);
if (process_address == LLDB_INVALID_ADDRESS)
return false;
lldb_private::Scalar cast_scalar;
if (!AssignToMatchType(cast_scalar, scalar.GetRawBits64(0), value->getType()))
return false;
size_t value_byte_size = m_target_data.getTypeStoreSize(value->getType());
lldb_private::DataBufferHeap buf(value_byte_size, 0);
lldb_private::Error get_data_error;
if (!cast_scalar.GetAsMemoryData(buf.GetBytes(), buf.GetByteSize(), m_byte_order, get_data_error))
return false;
lldb_private::Error write_error;
m_memory_map.WriteMemory(process_address, buf.GetBytes(), buf.GetByteSize(), write_error);
return write_error.Success();
}
bool ResolveConstantValue (APInt &value, const Constant *constant)
{
switch (constant->getValueID())
{
default:
break;
case Value::ConstantIntVal:
if (const ConstantInt *constant_int = dyn_cast<ConstantInt>(constant))
{
value = constant_int->getValue();
return true;
}
break;
case Value::ConstantFPVal:
if (const ConstantFP *constant_fp = dyn_cast<ConstantFP>(constant))
{
value = constant_fp->getValueAPF().bitcastToAPInt();
return true;
}
break;
case Value::ConstantExprVal:
if (const ConstantExpr *constant_expr = dyn_cast<ConstantExpr>(constant))
{
switch (constant_expr->getOpcode())
{
default:
return false;
case Instruction::IntToPtr:
case Instruction::PtrToInt:
case Instruction::BitCast:
return ResolveConstantValue(value, constant_expr->getOperand(0));
case Instruction::GetElementPtr:
{
ConstantExpr::const_op_iterator op_cursor = constant_expr->op_begin();
ConstantExpr::const_op_iterator op_end = constant_expr->op_end();
Constant *base = dyn_cast<Constant>(*op_cursor);
if (!base)
return false;
if (!ResolveConstantValue(value, base))
return false;
op_cursor++;
if (op_cursor == op_end)
return true; // no offset to apply!
SmallVector <Value *, 8> indices (op_cursor, op_end);
uint64_t offset = m_target_data.getIndexedOffset(base->getType(), indices);
const bool is_signed = true;
value += APInt(value.getBitWidth(), offset, is_signed);
return true;
}
}
}
break;
case Value::ConstantPointerNullVal:
if (isa<ConstantPointerNull>(constant))
{
value = APInt(m_target_data.getPointerSizeInBits(), 0);
return true;
}
break;
}
return false;
}
bool MakeArgument(const Argument *value, uint64_t address)
{
lldb::addr_t data_address = Malloc(value->getType());
if (data_address == LLDB_INVALID_ADDRESS)
return false;
lldb_private::Error write_error;
m_memory_map.WritePointerToMemory(data_address, address, write_error);
if (!write_error.Success())
{
lldb_private::Error free_error;
m_memory_map.Free(data_address, free_error);
return false;
}
m_values[value] = data_address;
lldb_private::Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));
if (log)
{
log->Printf("Made an allocation for argument %s", PrintValue(value).c_str());
log->Printf(" Data region : %llx", (unsigned long long)address);
log->Printf(" Ref region : %llx", (unsigned long long)data_address);
}
return true;
}
bool ResolveConstant (lldb::addr_t process_address, const Constant *constant)
{
APInt resolved_value;
if (!ResolveConstantValue(resolved_value, constant))
return false;
const uint64_t *raw_data = resolved_value.getRawData();
size_t constant_size = m_target_data.getTypeStoreSize(constant->getType());
lldb_private::Error write_error;
m_memory_map.WriteMemory(process_address, (uint8_t*)raw_data, constant_size, write_error);
return write_error.Success();
}
lldb::addr_t Malloc (size_t size, uint8_t byte_alignment)
{
lldb::addr_t ret = m_stack_pointer;
ret -= size;
ret -= (ret % byte_alignment);
if (ret < m_frame_process_address)
return LLDB_INVALID_ADDRESS;
m_stack_pointer = ret;
return ret;
}
lldb::addr_t MallocPointer ()
{
return Malloc(m_target_data.getPointerSize(), m_target_data.getPointerPrefAlignment());
}
lldb::addr_t Malloc (llvm::Type *type)
{
lldb_private::Error alloc_error;
return Malloc(m_target_data.getTypeAllocSize(type), m_target_data.getPrefTypeAlignment(type));
}
std::string PrintData (lldb::addr_t addr, llvm::Type *type)
{
size_t length = m_target_data.getTypeStoreSize(type);
lldb_private::DataBufferHeap buf(length, 0);
lldb_private::Error read_error;
m_memory_map.ReadMemory(buf.GetBytes(), addr, length, read_error);
if (!read_error.Success())
return std::string("<couldn't read data>");
lldb_private::StreamString ss;
for (size_t i = 0; i < length; i++)
{
if ((!(i & 0xf)) && i)
ss.Printf("%02hhx - ", buf.GetBytes()[i]);
else
ss.Printf("%02hhx ", buf.GetBytes()[i]);
}
return ss.GetString();
}
lldb::addr_t ResolveValue (const Value *value, Module &module)
{
ValueMap::iterator i = m_values.find(value);
if (i != m_values.end())
return i->second;
// Fall back and allocate space [allocation type Alloca]
lldb::addr_t data_address = Malloc(value->getType());
if (const Constant *constant = dyn_cast<Constant>(value))
{
if (!ResolveConstant (data_address, constant))
{
lldb_private::Error free_error;
m_memory_map.Free(data_address, free_error);
return LLDB_INVALID_ADDRESS;
}
}
m_values[value] = data_address;
return data_address;
}
};
static const char *unsupported_opcode_error = "Interpreter doesn't handle one of the expression's opcodes";
static const char *unsupported_operand_error = "Interpreter doesn't handle one of the expression's operands";
//static const char *interpreter_initialization_error = "Interpreter couldn't be initialized";
static const char *interpreter_internal_error = "Interpreter encountered an internal error";
static const char *bad_value_error = "Interpreter couldn't resolve a value during execution";
static const char *memory_allocation_error = "Interpreter couldn't allocate memory";
static const char *memory_write_error = "Interpreter couldn't write to memory";
static const char *memory_read_error = "Interpreter couldn't read from memory";
static const char *infinite_loop_error = "Interpreter ran for too many cycles";
//static const char *bad_result_error = "Result of expression is in bad memory";
bool
IRInterpreter::CanInterpret (llvm::Module &module,
llvm::Function &function,
lldb_private::Error &error)
{
lldb_private::Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));
bool saw_function_with_body = false;
for (Module::iterator fi = module.begin(), fe = module.end();
fi != fe;
++fi)
{
if (fi->begin() != fi->end())
{
if (saw_function_with_body)
return false;
saw_function_with_body = true;
}
}
for (Function::iterator bbi = function.begin(), bbe = function.end();
bbi != bbe;
++bbi)
{
for (BasicBlock::iterator ii = bbi->begin(), ie = bbi->end();
ii != ie;
++ii)
{
switch (ii->getOpcode())
{
default:
{
if (log)
log->Printf("Unsupported instruction: %s", PrintValue(ii).c_str());
error.SetErrorToGenericError();
error.SetErrorString(unsupported_opcode_error);
return false;
}
case Instruction::Add:
case Instruction::Alloca:
case Instruction::BitCast:
case Instruction::Br:
case Instruction::GetElementPtr:
break;
case Instruction::ICmp:
{
ICmpInst *icmp_inst = dyn_cast<ICmpInst>(ii);
if (!icmp_inst)
{
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
switch (icmp_inst->getPredicate())
{
default:
{
if (log)
log->Printf("Unsupported ICmp predicate: %s", PrintValue(ii).c_str());
error.SetErrorToGenericError();
error.SetErrorString(unsupported_opcode_error);
return false;
}
case CmpInst::ICMP_EQ:
case CmpInst::ICMP_NE:
case CmpInst::ICMP_UGT:
case CmpInst::ICMP_UGE:
case CmpInst::ICMP_ULT:
case CmpInst::ICMP_ULE:
case CmpInst::ICMP_SGT:
case CmpInst::ICMP_SGE:
case CmpInst::ICMP_SLT:
case CmpInst::ICMP_SLE:
break;
}
}
break;
case Instruction::And:
case Instruction::AShr:
case Instruction::IntToPtr:
case Instruction::PtrToInt:
case Instruction::Load:
case Instruction::LShr:
case Instruction::Mul:
case Instruction::Or:
case Instruction::Ret:
case Instruction::SDiv:
case Instruction::SExt:
case Instruction::Shl:
case Instruction::SRem:
case Instruction::Store:
case Instruction::Sub:
case Instruction::UDiv:
case Instruction::URem:
case Instruction::Xor:
case Instruction::ZExt:
break;
}
for (int oi = 0, oe = ii->getNumOperands();
oi != oe;
++oi)
{
Value *operand = ii->getOperand(oi);
Type *operand_type = operand->getType();
switch (operand_type->getTypeID())
{
default:
break;
case Type::VectorTyID:
{
if (log)
log->Printf("Unsupported operand type: %s", PrintType(operand_type).c_str());
error.SetErrorString(unsupported_operand_error);
return false;
}
}
}
}
}
return true;}
bool
IRInterpreter::Interpret (llvm::Module &module,
llvm::Function &function,
llvm::ArrayRef<lldb::addr_t> args,
lldb_private::IRMemoryMap &memory_map,
lldb_private::Error &error,
lldb::addr_t stack_frame_bottom,
lldb::addr_t stack_frame_top)
{
lldb_private::Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));
if (log)
{
std::string s;
raw_string_ostream oss(s);
module.print(oss, NULL);
oss.flush();
log->Printf("Module as passed in to IRInterpreter::Interpret: \n\"%s\"", s.c_str());
}
DataLayout data_layout(&module);
InterpreterStackFrame frame(data_layout, memory_map, 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() < 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.begin());
while (frame.m_ii != frame.m_ie && (++num_insts < 4096))
{
const Instruction *inst = frame.m_ii;
if (log)
log->Printf("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)
{
if (log)
log->Printf("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))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(lhs).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
if (!frame.EvaluateValue(R, rhs, module))
{
if (log)
log->Printf("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:
result = L.GetRawBits64(0) / R.GetRawBits64(1);
break;
case Instruction::SRem:
L.MakeSigned();
R.MakeSigned();
result = L % R;
break;
case Instruction::URem:
result = L.GetRawBits64(0) % R.GetRawBits64(1);
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)
{
log->Printf("Interpreted a %s", inst->getOpcodeName());
log->Printf(" L : %s", frame.SummarizeValue(lhs).c_str());
log->Printf(" R : %s", frame.SummarizeValue(rhs).c_str());
log->Printf(" = : %s", frame.SummarizeValue(inst).c_str());
}
}
break;
case Instruction::Alloca:
{
const AllocaInst *alloca_inst = dyn_cast<AllocaInst>(inst);
if (!alloca_inst)
{
if (log)
log->Printf("getOpcode() returns Alloca, but instruction is not an AllocaInst");
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
if (alloca_inst->isArrayAllocation())
{
if (log)
log->Printf("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)
{
if (log)
log->Printf("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)
{
if (log)
log->Printf("Couldn't allocate the result pointer for an AllocaInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_allocation_error);
return false;
}
lldb_private::Error write_error;
memory_map.WritePointerToMemory(P, R, write_error);
if (!write_error.Success())
{
if (log)
log->Printf("Couldn't write the result pointer for an AllocaInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_write_error);
lldb_private::Error free_error;
memory_map.Free(P, free_error);
memory_map.Free(R, free_error);
return false;
}
frame.m_values[alloca_inst] = P;
if (log)
{
log->Printf("Interpreted an AllocaInst");
log->Printf(" R : 0x%" PRIx64, R);
log->Printf(" P : 0x%" PRIx64, P);
}
}
break;
case Instruction::BitCast:
case Instruction::ZExt:
{
const CastInst *cast_inst = dyn_cast<CastInst>(inst);
if (!cast_inst)
{
if (log)
log->Printf("getOpcode() returns %s, but instruction is not a BitCastInst", cast_inst->getOpcodeName());
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
Value *source = cast_inst->getOperand(0);
lldb_private::Scalar S;
if (!frame.EvaluateValue(S, source, module))
{
if (log)
log->Printf("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 = dyn_cast<CastInst>(inst);
if (!cast_inst)
{
if (log)
log->Printf("getOpcode() returns %s, but instruction is not a BitCastInst", cast_inst->getOpcodeName());
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
Value *source = cast_inst->getOperand(0);
lldb_private::Scalar S;
if (!frame.EvaluateValue(S, source, module))
{
if (log)
log->Printf("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 = dyn_cast<BranchInst>(inst);
if (!br_inst)
{
if (log)
log->Printf("getOpcode() returns Br, but instruction is not a BranchInst");
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
if (br_inst->isConditional())
{
Value *condition = br_inst->getCondition();
lldb_private::Scalar C;
if (!frame.EvaluateValue(C, condition, module))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(condition).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
if (C.GetRawBits64(0))
frame.Jump(br_inst->getSuccessor(0));
else
frame.Jump(br_inst->getSuccessor(1));
if (log)
{
log->Printf("Interpreted a BrInst with a condition");
log->Printf(" cond : %s", frame.SummarizeValue(condition).c_str());
}
}
else
{
frame.Jump(br_inst->getSuccessor(0));
if (log)
{
log->Printf("Interpreted a BrInst with no condition");
}
}
}
continue;
case Instruction::GetElementPtr:
{
const GetElementPtrInst *gep_inst = dyn_cast<GetElementPtrInst>(inst);
if (!gep_inst)
{
if (log)
log->Printf("getOpcode() returns GetElementPtr, but instruction is not a GetElementPtrInst");
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
const Value *pointer_operand = gep_inst->getPointerOperand();
Type *pointer_type = pointer_operand->getType();
lldb_private::Scalar P;
if (!frame.EvaluateValue(P, pointer_operand, module))
{
if (log)
log->Printf("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))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(*ii).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
if (log)
log->Printf("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.getIndexedOffset(pointer_type, const_indices);
lldb_private::Scalar Poffset = P + offset;
frame.AssignValue(inst, Poffset, module);
if (log)
{
log->Printf("Interpreted a GetElementPtrInst");
log->Printf(" P : %s", frame.SummarizeValue(pointer_operand).c_str());
log->Printf(" Poffset : %s", frame.SummarizeValue(inst).c_str());
}
}
break;
case Instruction::ICmp:
{
const ICmpInst *icmp_inst = dyn_cast<ICmpInst>(inst);
if (!icmp_inst)
{
if (log)
log->Printf("getOpcode() returns ICmp, but instruction is not an ICmpInst");
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
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))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(lhs).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
if (!frame.EvaluateValue(R, rhs, module))
{
if (log)
log->Printf("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:
result = (L.GetRawBits64(0) > R.GetRawBits64(0));
break;
case CmpInst::ICMP_UGE:
result = (L.GetRawBits64(0) >= R.GetRawBits64(0));
break;
case CmpInst::ICMP_ULT:
result = (L.GetRawBits64(0) < R.GetRawBits64(0));
break;
case CmpInst::ICMP_ULE:
result = (L.GetRawBits64(0) <= R.GetRawBits64(0));
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)
{
log->Printf("Interpreted an ICmpInst");
log->Printf(" L : %s", frame.SummarizeValue(lhs).c_str());
log->Printf(" R : %s", frame.SummarizeValue(rhs).c_str());
log->Printf(" = : %s", frame.SummarizeValue(inst).c_str());
}
}
break;
case Instruction::IntToPtr:
{
const IntToPtrInst *int_to_ptr_inst = dyn_cast<IntToPtrInst>(inst);
if (!int_to_ptr_inst)
{
if (log)
log->Printf("getOpcode() returns IntToPtr, but instruction is not an IntToPtrInst");
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
Value *src_operand = int_to_ptr_inst->getOperand(0);
lldb_private::Scalar I;
if (!frame.EvaluateValue(I, src_operand, module))
{
if (log)
log->Printf("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)
{
log->Printf("Interpreted an IntToPtr");
log->Printf(" Src : %s", frame.SummarizeValue(src_operand).c_str());
log->Printf(" = : %s", frame.SummarizeValue(inst).c_str());
}
}
break;
case Instruction::PtrToInt:
{
const PtrToIntInst *ptr_to_int_inst = dyn_cast<PtrToIntInst>(inst);
if (!ptr_to_int_inst)
{
if (log)
log->Printf("getOpcode() returns PtrToInt, but instruction is not an PtrToIntInst");
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
Value *src_operand = ptr_to_int_inst->getOperand(0);
lldb_private::Scalar I;
if (!frame.EvaluateValue(I, src_operand, module))
{
if (log)
log->Printf("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)
{
log->Printf("Interpreted a PtrToInt");
log->Printf(" Src : %s", frame.SummarizeValue(src_operand).c_str());
log->Printf(" = : %s", frame.SummarizeValue(inst).c_str());
}
}
break;
case Instruction::Load:
{
const LoadInst *load_inst = dyn_cast<LoadInst>(inst);
if (!load_inst)
{
if (log)
log->Printf("getOpcode() returns Load, but instruction is not a LoadInst");
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
// 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)
{
if (log)
log->Printf("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)
{
if (log)
log->Printf("LoadInst's value doesn't resolve to anything");
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
if (P == LLDB_INVALID_ADDRESS)
{
if (log)
log->Printf("LoadInst's pointer doesn't resolve to anything");
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
lldb::addr_t R;
lldb_private::Error read_error;
memory_map.ReadPointerFromMemory(&R, P, read_error);
if (!read_error.Success())
{
if (log)
log->Printf("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();
memory_map.ReadMemory(buffer.GetBytes(), R, buffer.GetByteSize(), read_error);
if (!read_error.Success())
{
if (log)
log->Printf("Couldn't read from a region on behalf of a LoadInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_read_error);
return false;
}
lldb_private::Error write_error;
memory_map.WriteMemory(D, buffer.GetBytes(), buffer.GetByteSize(), write_error);
if (!write_error.Success())
{
if (log)
log->Printf("Couldn't write to a region on behalf of a LoadInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_read_error);
return false;
}
if (log)
{
log->Printf("Interpreted a LoadInst");
log->Printf(" P : 0x%" PRIx64, P);
log->Printf(" R : 0x%" PRIx64, R);
log->Printf(" D : 0x%" PRIx64, D);
}
}
break;
case Instruction::Ret:
{
return true;
}
case Instruction::Store:
{
const StoreInst *store_inst = dyn_cast<StoreInst>(inst);
if (!store_inst)
{
if (log)
log->Printf("getOpcode() returns Store, but instruction is not a StoreInst");
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
// 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)
{
if (log)
log->Printf("StoreInst's value doesn't resolve to anything");
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
if (P == LLDB_INVALID_ADDRESS)
{
if (log)
log->Printf("StoreInst's pointer doesn't resolve to anything");
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
lldb::addr_t R;
lldb_private::Error read_error;
memory_map.ReadPointerFromMemory(&R, P, read_error);
if (!read_error.Success())
{
if (log)
log->Printf("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();
memory_map.ReadMemory(buffer.GetBytes(), D, buffer.GetByteSize(), read_error);
if (!read_error.Success())
{
if (log)
log->Printf("Couldn't read from a region on behalf of a StoreInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_read_error);
return false;
}
lldb_private::Error write_error;
memory_map.WriteMemory(R, buffer.GetBytes(), buffer.GetByteSize(), write_error);
if (!write_error.Success())
{
if (log)
log->Printf("Couldn't write to a region on behalf of a StoreInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_write_error);
return false;
}
if (log)
{
log->Printf("Interpreted a StoreInst");
log->Printf(" D : 0x%" PRIx64, D);
log->Printf(" P : 0x%" PRIx64, P);
log->Printf(" R : 0x%" PRIx64, R);
}
}
break;
}
++frame.m_ii;
}
if (num_insts >= 4096)
{
error.SetErrorToGenericError();
error.SetErrorString(infinite_loop_error);
return false;
}
return false;
}