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1539 lines
48 KiB
1539 lines
48 KiB
//===-- IRInterpreter.cpp -------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Expression/IRInterpreter.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Core/ModuleSpec.h"
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#include "lldb/Core/ValueObject.h"
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#include "lldb/Expression/DiagnosticManager.h"
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#include "lldb/Expression/IRExecutionUnit.h"
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#include "lldb/Expression/IRMemoryMap.h"
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#include "lldb/Utility/ConstString.h"
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#include "lldb/Utility/DataExtractor.h"
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#include "lldb/Utility/Endian.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/Scalar.h"
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#include "lldb/Utility/Status.h"
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#include "lldb/Utility/StreamString.h"
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#include "lldb/Target/ABI.h"
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#include "lldb/Target/ExecutionContext.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Target/Thread.h"
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#include "lldb/Target/ThreadPlan.h"
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#include "lldb/Target/ThreadPlanCallFunctionUsingABI.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Operator.h"
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#include "llvm/Support/raw_ostream.h"
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#include <map>
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using namespace llvm;
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static std::string PrintValue(const Value *value, bool truncate = false) {
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std::string s;
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raw_string_ostream rso(s);
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value->print(rso);
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rso.flush();
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if (truncate)
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s.resize(s.length() - 1);
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size_t offset;
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while ((offset = s.find('\n')) != s.npos)
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s.erase(offset, 1);
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while (s[0] == ' ' || s[0] == '\t')
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s.erase(0, 1);
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return s;
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}
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static std::string PrintType(const Type *type, bool truncate = false) {
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std::string s;
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raw_string_ostream rso(s);
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type->print(rso);
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rso.flush();
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if (truncate)
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s.resize(s.length() - 1);
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return s;
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}
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static bool CanIgnoreCall(const CallInst *call) {
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const llvm::Function *called_function = call->getCalledFunction();
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if (!called_function)
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return false;
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if (called_function->isIntrinsic()) {
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switch (called_function->getIntrinsicID()) {
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default:
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break;
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case llvm::Intrinsic::dbg_declare:
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case llvm::Intrinsic::dbg_value:
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return true;
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}
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}
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return false;
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}
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class InterpreterStackFrame {
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public:
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typedef std::map<const Value *, lldb::addr_t> ValueMap;
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ValueMap m_values;
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DataLayout &m_target_data;
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lldb_private::IRExecutionUnit &m_execution_unit;
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const BasicBlock *m_bb;
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const BasicBlock *m_prev_bb;
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BasicBlock::const_iterator m_ii;
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BasicBlock::const_iterator m_ie;
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lldb::addr_t m_frame_process_address;
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size_t m_frame_size;
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lldb::addr_t m_stack_pointer;
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lldb::ByteOrder m_byte_order;
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size_t m_addr_byte_size;
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InterpreterStackFrame(DataLayout &target_data,
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lldb_private::IRExecutionUnit &execution_unit,
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lldb::addr_t stack_frame_bottom,
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lldb::addr_t stack_frame_top)
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: m_target_data(target_data), m_execution_unit(execution_unit),
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m_bb(nullptr), m_prev_bb(nullptr) {
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m_byte_order = (target_data.isLittleEndian() ? lldb::eByteOrderLittle
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: lldb::eByteOrderBig);
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m_addr_byte_size = (target_data.getPointerSize(0));
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m_frame_process_address = stack_frame_bottom;
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m_frame_size = stack_frame_top - stack_frame_bottom;
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m_stack_pointer = stack_frame_top;
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}
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~InterpreterStackFrame() {}
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void Jump(const BasicBlock *bb) {
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m_prev_bb = m_bb;
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m_bb = bb;
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m_ii = m_bb->begin();
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m_ie = m_bb->end();
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}
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std::string SummarizeValue(const Value *value) {
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lldb_private::StreamString ss;
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ss.Printf("%s", PrintValue(value).c_str());
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ValueMap::iterator i = m_values.find(value);
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if (i != m_values.end()) {
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lldb::addr_t addr = i->second;
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ss.Printf(" 0x%llx", (unsigned long long)addr);
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}
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return std::string(ss.GetString());
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}
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bool AssignToMatchType(lldb_private::Scalar &scalar, llvm::APInt value,
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Type *type) {
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size_t type_size = m_target_data.getTypeStoreSize(type);
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if (type_size > 8)
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return false;
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if (type_size != 1)
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type_size = PowerOf2Ceil(type_size);
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scalar = value.zextOrTrunc(type_size * 8);
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return true;
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}
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bool EvaluateValue(lldb_private::Scalar &scalar, const Value *value,
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Module &module) {
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const Constant *constant = dyn_cast<Constant>(value);
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if (constant) {
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APInt value_apint;
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if (!ResolveConstantValue(value_apint, constant))
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return false;
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return AssignToMatchType(scalar, value_apint, value->getType());
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}
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lldb::addr_t process_address = ResolveValue(value, module);
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size_t value_size = m_target_data.getTypeStoreSize(value->getType());
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lldb_private::DataExtractor value_extractor;
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lldb_private::Status extract_error;
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m_execution_unit.GetMemoryData(value_extractor, process_address,
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value_size, extract_error);
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if (!extract_error.Success())
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return false;
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lldb::offset_t offset = 0;
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if (value_size <= 8) {
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uint64_t u64value = value_extractor.GetMaxU64(&offset, value_size);
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return AssignToMatchType(scalar, llvm::APInt(64, u64value),
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value->getType());
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}
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return false;
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}
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bool AssignValue(const Value *value, lldb_private::Scalar scalar,
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Module &module) {
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lldb::addr_t process_address = ResolveValue(value, module);
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if (process_address == LLDB_INVALID_ADDRESS)
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return false;
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lldb_private::Scalar cast_scalar;
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scalar.MakeUnsigned();
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if (!AssignToMatchType(cast_scalar, scalar.UInt128(llvm::APInt()),
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value->getType()))
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return false;
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size_t value_byte_size = m_target_data.getTypeStoreSize(value->getType());
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lldb_private::DataBufferHeap buf(value_byte_size, 0);
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lldb_private::Status get_data_error;
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if (!cast_scalar.GetAsMemoryData(buf.GetBytes(), buf.GetByteSize(),
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m_byte_order, get_data_error))
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return false;
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lldb_private::Status write_error;
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m_execution_unit.WriteMemory(process_address, buf.GetBytes(),
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buf.GetByteSize(), write_error);
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return write_error.Success();
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}
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bool ResolveConstantValue(APInt &value, const Constant *constant) {
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switch (constant->getValueID()) {
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default:
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break;
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case Value::FunctionVal:
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if (const Function *constant_func = dyn_cast<Function>(constant)) {
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lldb_private::ConstString name(constant_func->getName());
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bool missing_weak = false;
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lldb::addr_t addr = m_execution_unit.FindSymbol(name, missing_weak);
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if (addr == LLDB_INVALID_ADDRESS || missing_weak)
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return false;
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value = APInt(m_target_data.getPointerSizeInBits(), addr);
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return true;
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}
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break;
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case Value::ConstantIntVal:
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if (const ConstantInt *constant_int = dyn_cast<ConstantInt>(constant)) {
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value = constant_int->getValue();
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return true;
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}
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break;
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case Value::ConstantFPVal:
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if (const ConstantFP *constant_fp = dyn_cast<ConstantFP>(constant)) {
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value = constant_fp->getValueAPF().bitcastToAPInt();
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return true;
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}
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break;
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case Value::ConstantExprVal:
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if (const ConstantExpr *constant_expr =
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dyn_cast<ConstantExpr>(constant)) {
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switch (constant_expr->getOpcode()) {
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default:
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return false;
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case Instruction::IntToPtr:
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case Instruction::PtrToInt:
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case Instruction::BitCast:
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return ResolveConstantValue(value, constant_expr->getOperand(0));
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case Instruction::GetElementPtr: {
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ConstantExpr::const_op_iterator op_cursor = constant_expr->op_begin();
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ConstantExpr::const_op_iterator op_end = constant_expr->op_end();
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Constant *base = dyn_cast<Constant>(*op_cursor);
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if (!base)
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return false;
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if (!ResolveConstantValue(value, base))
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return false;
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op_cursor++;
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if (op_cursor == op_end)
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return true; // no offset to apply!
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SmallVector<Value *, 8> indices(op_cursor, op_end);
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Type *src_elem_ty =
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cast<GEPOperator>(constant_expr)->getSourceElementType();
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uint64_t offset =
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m_target_data.getIndexedOffsetInType(src_elem_ty, indices);
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const bool is_signed = true;
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value += APInt(value.getBitWidth(), offset, is_signed);
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return true;
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}
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}
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}
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break;
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case Value::ConstantPointerNullVal:
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if (isa<ConstantPointerNull>(constant)) {
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value = APInt(m_target_data.getPointerSizeInBits(), 0);
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return true;
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}
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break;
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}
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return false;
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}
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bool MakeArgument(const Argument *value, uint64_t address) {
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lldb::addr_t data_address = Malloc(value->getType());
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if (data_address == LLDB_INVALID_ADDRESS)
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return false;
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lldb_private::Status write_error;
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m_execution_unit.WritePointerToMemory(data_address, address, write_error);
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if (!write_error.Success()) {
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lldb_private::Status free_error;
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m_execution_unit.Free(data_address, free_error);
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return false;
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}
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m_values[value] = data_address;
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lldb_private::Log *log(
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lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
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if (log) {
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LLDB_LOGF(log, "Made an allocation for argument %s",
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PrintValue(value).c_str());
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LLDB_LOGF(log, " Data region : %llx", (unsigned long long)address);
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LLDB_LOGF(log, " Ref region : %llx",
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(unsigned long long)data_address);
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}
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return true;
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}
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bool ResolveConstant(lldb::addr_t process_address, const Constant *constant) {
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APInt resolved_value;
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if (!ResolveConstantValue(resolved_value, constant))
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return false;
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size_t constant_size = m_target_data.getTypeStoreSize(constant->getType());
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lldb_private::DataBufferHeap buf(constant_size, 0);
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lldb_private::Status get_data_error;
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lldb_private::Scalar resolved_scalar(
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resolved_value.zextOrTrunc(llvm::NextPowerOf2(constant_size) * 8));
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if (!resolved_scalar.GetAsMemoryData(buf.GetBytes(), buf.GetByteSize(),
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m_byte_order, get_data_error))
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return false;
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lldb_private::Status write_error;
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m_execution_unit.WriteMemory(process_address, buf.GetBytes(),
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buf.GetByteSize(), write_error);
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return write_error.Success();
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}
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lldb::addr_t Malloc(size_t size, uint8_t byte_alignment) {
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lldb::addr_t ret = m_stack_pointer;
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ret -= size;
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ret -= (ret % byte_alignment);
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if (ret < m_frame_process_address)
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return LLDB_INVALID_ADDRESS;
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m_stack_pointer = ret;
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return ret;
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}
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lldb::addr_t Malloc(llvm::Type *type) {
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lldb_private::Status alloc_error;
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return Malloc(m_target_data.getTypeAllocSize(type),
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m_target_data.getPrefTypeAlignment(type));
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}
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std::string PrintData(lldb::addr_t addr, llvm::Type *type) {
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size_t length = m_target_data.getTypeStoreSize(type);
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lldb_private::DataBufferHeap buf(length, 0);
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lldb_private::Status read_error;
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m_execution_unit.ReadMemory(buf.GetBytes(), addr, length, read_error);
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if (!read_error.Success())
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return std::string("<couldn't read data>");
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lldb_private::StreamString ss;
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for (size_t i = 0; i < length; i++) {
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if ((!(i & 0xf)) && i)
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ss.Printf("%02hhx - ", buf.GetBytes()[i]);
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else
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ss.Printf("%02hhx ", buf.GetBytes()[i]);
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}
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return std::string(ss.GetString());
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}
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lldb::addr_t ResolveValue(const Value *value, Module &module) {
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ValueMap::iterator i = m_values.find(value);
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if (i != m_values.end())
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return i->second;
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// Fall back and allocate space [allocation type Alloca]
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lldb::addr_t data_address = Malloc(value->getType());
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if (const Constant *constant = dyn_cast<Constant>(value)) {
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if (!ResolveConstant(data_address, constant)) {
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lldb_private::Status free_error;
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m_execution_unit.Free(data_address, free_error);
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return LLDB_INVALID_ADDRESS;
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}
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}
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m_values[value] = data_address;
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return data_address;
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}
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};
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static const char *unsupported_opcode_error =
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"Interpreter doesn't handle one of the expression's opcodes";
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static const char *unsupported_operand_error =
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"Interpreter doesn't handle one of the expression's operands";
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static const char *interpreter_internal_error =
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"Interpreter encountered an internal error";
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static const char *bad_value_error =
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"Interpreter couldn't resolve a value during execution";
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static const char *memory_allocation_error =
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"Interpreter couldn't allocate memory";
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static const char *memory_write_error = "Interpreter couldn't write to memory";
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static const char *memory_read_error = "Interpreter couldn't read from memory";
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static const char *infinite_loop_error = "Interpreter ran for too many cycles";
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static const char *too_many_functions_error =
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"Interpreter doesn't handle modules with multiple function bodies.";
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static bool CanResolveConstant(llvm::Constant *constant) {
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switch (constant->getValueID()) {
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default:
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return false;
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case Value::ConstantIntVal:
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case Value::ConstantFPVal:
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case Value::FunctionVal:
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return true;
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case Value::ConstantExprVal:
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if (const ConstantExpr *constant_expr = dyn_cast<ConstantExpr>(constant)) {
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switch (constant_expr->getOpcode()) {
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default:
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return false;
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case Instruction::IntToPtr:
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case Instruction::PtrToInt:
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case Instruction::BitCast:
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return CanResolveConstant(constant_expr->getOperand(0));
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case Instruction::GetElementPtr: {
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ConstantExpr::const_op_iterator op_cursor = constant_expr->op_begin();
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Constant *base = dyn_cast<Constant>(*op_cursor);
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if (!base)
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return false;
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return CanResolveConstant(base);
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}
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}
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} else {
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return false;
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}
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case Value::ConstantPointerNullVal:
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return true;
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}
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}
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bool IRInterpreter::CanInterpret(llvm::Module &module, llvm::Function &function,
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lldb_private::Status &error,
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const bool support_function_calls) {
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lldb_private::Log *log(
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lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
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bool saw_function_with_body = false;
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for (Function &f : module) {
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if (f.begin() != f.end()) {
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if (saw_function_with_body) {
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LLDB_LOGF(log, "More than one function in the module has a body");
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error.SetErrorToGenericError();
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error.SetErrorString(too_many_functions_error);
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return false;
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}
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saw_function_with_body = true;
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}
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}
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for (BasicBlock &bb : function) {
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for (Instruction &ii : bb) {
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switch (ii.getOpcode()) {
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default: {
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LLDB_LOGF(log, "Unsupported instruction: %s", PrintValue(&ii).c_str());
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error.SetErrorToGenericError();
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error.SetErrorString(unsupported_opcode_error);
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return false;
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}
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case Instruction::Add:
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case Instruction::Alloca:
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case Instruction::BitCast:
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case Instruction::Br:
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case Instruction::PHI:
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break;
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case Instruction::Call: {
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CallInst *call_inst = dyn_cast<CallInst>(&ii);
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if (!call_inst) {
|
|
error.SetErrorToGenericError();
|
|
error.SetErrorString(interpreter_internal_error);
|
|
return false;
|
|
}
|
|
|
|
if (!CanIgnoreCall(call_inst) && !support_function_calls) {
|
|
LLDB_LOGF(log, "Unsupported instruction: %s",
|
|
PrintValue(&ii).c_str());
|
|
error.SetErrorToGenericError();
|
|
error.SetErrorString(unsupported_opcode_error);
|
|
return false;
|
|
}
|
|
} break;
|
|
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: {
|
|
LLDB_LOGF(log, "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::Trunc:
|
|
case Instruction::UDiv:
|
|
case Instruction::URem:
|
|
case Instruction::Xor:
|
|
case Instruction::ZExt:
|
|
break;
|
|
}
|
|
|
|
for (unsigned 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::FixedVectorTyID:
|
|
case Type::ScalableVectorTyID: {
|
|
LLDB_LOGF(log, "Unsupported operand type: %s",
|
|
PrintType(operand_type).c_str());
|
|
error.SetErrorString(unsupported_operand_error);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// The IR interpreter currently doesn't know about
|
|
// 128-bit integers. As they're not that frequent,
|
|
// we can just fall back to the JIT rather than
|
|
// choking.
|
|
if (operand_type->getPrimitiveSizeInBits() > 64) {
|
|
LLDB_LOGF(log, "Unsupported operand type: %s",
|
|
PrintType(operand_type).c_str());
|
|
error.SetErrorString(unsupported_operand_error);
|
|
return false;
|
|
}
|
|
|
|
if (Constant *constant = llvm::dyn_cast<Constant>(operand)) {
|
|
if (!CanResolveConstant(constant)) {
|
|
LLDB_LOGF(log, "Unsupported constant: %s",
|
|
PrintValue(constant).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::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_read_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->getNumArgOperands();
|
|
|
|
// 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;
|
|
}
|