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806 lines
19 KiB
806 lines
19 KiB
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#include "Compiler.h"
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#include <llvm/IR/IRBuilder.h>
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#include <llvm/IR/CFG.h>
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#include <libevmface/Instruction.h>
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#include "Memory.h"
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#include "Ext.h"
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namespace evmcc
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{
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struct
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{
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llvm::Type* word8;
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llvm::Type* word8ptr;
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llvm::Type* word256;
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llvm::Type* word256ptr;
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llvm::Type* word256arr;
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llvm::Type* size;
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llvm::Type* Void;
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llvm::Type* WordLowPrecision;
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} Types;
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Compiler::Compiler()
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{
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auto& context = llvm::getGlobalContext();
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Types.word8 = llvm::Type::getInt8Ty(context);
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Types.word8ptr = llvm::Type::getInt8PtrTy(context);
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Types.word256 = llvm::Type::getIntNTy(context, 256);
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Types.word256ptr = Types.word256->getPointerTo();
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Types.word256arr = llvm::ArrayType::get(Types.word256, 100);
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Types.size = llvm::Type::getInt64Ty(context);
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Types.Void = llvm::Type::getVoidTy(context);
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// TODO: Use 64-bit for now. In 128-bit compiler-rt library functions are required
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Types.WordLowPrecision = llvm::Type::getIntNTy(context, 64);
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}
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void Compiler::createBasicBlocks(const dev::bytes& bytecode)
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{
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std::set<ProgramCounter> splitPoints; // Sorted collections of instruction indecies where basic blocks start/end
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splitPoints.insert(0); // First basic block
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for (auto curr = bytecode.cbegin(); curr != bytecode.cend(); ++curr)
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{
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using dev::eth::Instruction;
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auto inst = static_cast<Instruction>(*curr);
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switch (inst)
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{
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case Instruction::PUSH1:
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case Instruction::PUSH2:
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case Instruction::PUSH3:
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case Instruction::PUSH4:
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case Instruction::PUSH5:
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case Instruction::PUSH6:
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case Instruction::PUSH7:
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case Instruction::PUSH8:
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case Instruction::PUSH9:
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case Instruction::PUSH10:
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case Instruction::PUSH11:
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case Instruction::PUSH12:
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case Instruction::PUSH13:
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case Instruction::PUSH14:
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case Instruction::PUSH15:
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case Instruction::PUSH16:
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case Instruction::PUSH17:
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case Instruction::PUSH18:
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case Instruction::PUSH19:
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case Instruction::PUSH20:
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case Instruction::PUSH21:
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case Instruction::PUSH22:
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case Instruction::PUSH23:
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case Instruction::PUSH24:
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case Instruction::PUSH25:
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case Instruction::PUSH26:
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case Instruction::PUSH27:
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case Instruction::PUSH28:
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case Instruction::PUSH29:
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case Instruction::PUSH30:
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case Instruction::PUSH31:
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case Instruction::PUSH32:
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{
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auto numBytes = static_cast<size_t>(inst) - static_cast<size_t>(Instruction::PUSH1) + 1;
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auto next = curr + numBytes + 1;
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if (next == bytecode.cend())
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break;
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auto nextInst = static_cast<Instruction>(*next);
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if (nextInst == Instruction::JUMP || nextInst == Instruction::JUMPI)
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{
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// Compute target PC of the jump.
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dev::u256 val = 0;
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for (auto iter = curr + 1; iter < next; ++iter)
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{
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val <<= 8;
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val |= *iter;
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}
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// Create a block following the JUMP.
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if (next + 1 < bytecode.cend())
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{
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ProgramCounter nextPC = (next + 1 - bytecode.cbegin());
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splitPoints.insert(nextPC);
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}
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// Create a block for the JUMP target.
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ProgramCounter targetPC = val.convert_to<ProgramCounter>();
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splitPoints.insert(targetPC);
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ProgramCounter jumpPC = (next - bytecode.cbegin());
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jumpTargets[jumpPC] = targetPC;
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curr += 1; // skip over JUMP
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}
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curr += numBytes;
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break;
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}
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case Instruction::JUMP:
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case Instruction::JUMPI:
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{
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std::cerr << "JUMP/JUMPI at " << (curr - bytecode.cbegin()) << " not preceded by PUSH\n";
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std::exit(1);
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}
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case Instruction::RETURN:
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case Instruction::STOP:
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case Instruction::SUICIDE:
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{
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// Create a basic block starting at the following instruction.
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if (curr + 1 < bytecode.cend())
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{
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ProgramCounter nextPC = (curr + 1 - bytecode.cbegin());
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splitPoints.insert(nextPC);
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}
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break;
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}
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default:
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break;
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}
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}
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splitPoints.insert(bytecode.size()); // For final block
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for (auto it = splitPoints.cbegin(); it != splitPoints.cend();)
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{
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auto beginInstIdx = *it;
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++it;
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auto endInstIdx = it != splitPoints.cend() ? *it : beginInstIdx; // For final block
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basicBlocks.emplace(std::piecewise_construct, std::forward_as_tuple(beginInstIdx), std::forward_as_tuple(beginInstIdx, endInstIdx, m_mainFunc));
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}
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}
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std::unique_ptr<llvm::Module> Compiler::compile(const dev::bytes& bytecode)
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{
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using namespace llvm;
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auto& context = getGlobalContext();
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auto module = std::make_unique<Module>("main", context);
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IRBuilder<> builder(context);
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// Create main function
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const auto i32Ty = builder.getInt32Ty();
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//Type* retTypeElems[] = {i32Ty, i32Ty};
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//auto retType = StructType::create(retTypeElems, "MemRef", true);
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m_mainFunc = Function::Create(FunctionType::get(builder.getInt64Ty(), false), Function::ExternalLinkage, "main", module.get());
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// Create the basic blocks.
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auto entryBlock = llvm::BasicBlock::Create(context, "entry", m_mainFunc);
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builder.SetInsertPoint(entryBlock);
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createBasicBlocks(bytecode);
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// Init runtime structures.
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auto memory = Memory(builder, module.get());
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auto ext = Ext(builder, module.get());
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// Jump to first instruction
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builder.CreateBr(basicBlocks.begin()->second);
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for (auto basicBlockPairIt = basicBlocks.begin(); basicBlockPairIt != basicBlocks.end(); ++basicBlockPairIt)
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{
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auto& basicBlock = basicBlockPairIt->second;
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auto& stack = basicBlock.getStack();
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builder.SetInsertPoint(basicBlock);
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for (auto currentPC = basicBlock.begin(); currentPC != basicBlock.end(); ++currentPC)
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{
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using dev::eth::Instruction;
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auto inst = static_cast<Instruction>(bytecode[currentPC]);
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switch (inst)
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{
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case Instruction::ADD:
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{
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auto lhs = stack.pop();
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auto rhs = stack.pop();
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auto result = builder.CreateAdd(lhs, rhs);
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stack.push(result);
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break;
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}
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case Instruction::SUB:
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{
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auto lhs = stack.pop();
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auto rhs = stack.pop();
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auto result = builder.CreateSub(lhs, rhs);
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stack.push(result);
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break;
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}
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case Instruction::MUL:
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{
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auto lhs256 = stack.pop();
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auto rhs256 = stack.pop();
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auto lhs128 = builder.CreateTrunc(lhs256, Types.WordLowPrecision);
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auto rhs128 = builder.CreateTrunc(rhs256, Types.WordLowPrecision);
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auto res128 = builder.CreateMul(lhs128, rhs128);
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auto res256 = builder.CreateZExt(res128, Types.word256);
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stack.push(res256);
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break;
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}
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case Instruction::DIV:
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{
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auto lhs256 = stack.pop();
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auto rhs256 = stack.pop();
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auto lhs128 = builder.CreateTrunc(lhs256, Types.WordLowPrecision);
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auto rhs128 = builder.CreateTrunc(rhs256, Types.WordLowPrecision);
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auto res128 = builder.CreateUDiv(lhs128, rhs128);
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auto res256 = builder.CreateZExt(res128, Types.word256);
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stack.push(res256);
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break;
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}
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case Instruction::SDIV:
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{
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auto lhs256 = stack.pop();
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auto rhs256 = stack.pop();
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auto lhs128 = builder.CreateTrunc(lhs256, Types.WordLowPrecision);
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auto rhs128 = builder.CreateTrunc(rhs256, Types.WordLowPrecision);
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auto res128 = builder.CreateSDiv(lhs128, rhs128);
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auto res256 = builder.CreateSExt(res128, Types.word256);
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stack.push(res256);
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break;
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}
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case Instruction::MOD:
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{
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auto lhs256 = stack.pop();
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auto rhs256 = stack.pop();
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auto lhs128 = builder.CreateTrunc(lhs256, Types.WordLowPrecision);
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auto rhs128 = builder.CreateTrunc(rhs256, Types.WordLowPrecision);
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auto res128 = builder.CreateURem(lhs128, rhs128);
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auto res256 = builder.CreateZExt(res128, Types.word256);
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stack.push(res256);
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break;
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}
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case Instruction::SMOD:
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{
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auto lhs256 = stack.pop();
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auto rhs256 = stack.pop();
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auto lhs128 = builder.CreateTrunc(lhs256, Types.WordLowPrecision);
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auto rhs128 = builder.CreateTrunc(rhs256, Types.WordLowPrecision);
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auto res128 = builder.CreateSRem(lhs128, rhs128);
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auto res256 = builder.CreateSExt(res128, Types.word256);
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stack.push(res256);
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break;
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}
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case Instruction::NEG:
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{
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auto top = stack.pop();
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auto zero = ConstantInt::get(Types.word256, 0);
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auto res = builder.CreateSub(zero, top);
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stack.push(res);
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break;
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}
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case Instruction::LT:
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{
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auto lhs = stack.pop();
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auto rhs = stack.pop();
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auto res1 = builder.CreateICmpULT(lhs, rhs);
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auto res256 = builder.CreateZExt(res1, Types.word256);
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stack.push(res256);
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break;
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}
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case Instruction::GT:
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{
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auto lhs = stack.pop();
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auto rhs = stack.pop();
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auto res1 = builder.CreateICmpUGT(lhs, rhs);
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auto res256 = builder.CreateZExt(res1, Types.word256);
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stack.push(res256);
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break;
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}
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case Instruction::SLT:
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{
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auto lhs = stack.pop();
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auto rhs = stack.pop();
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auto res1 = builder.CreateICmpSLT(lhs, rhs);
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auto res256 = builder.CreateZExt(res1, Types.word256);
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stack.push(res256);
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break;
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}
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case Instruction::SGT:
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{
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auto lhs = stack.pop();
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auto rhs = stack.pop();
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auto res1 = builder.CreateICmpSGT(lhs, rhs);
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auto res256 = builder.CreateZExt(res1, Types.word256);
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stack.push(res256);
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break;
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}
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case Instruction::EQ:
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{
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auto lhs = stack.pop();
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auto rhs = stack.pop();
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auto res1 = builder.CreateICmpEQ(lhs, rhs);
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auto res256 = builder.CreateZExt(res1, Types.word256);
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stack.push(res256);
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break;
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}
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case Instruction::NOT:
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{
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auto top = stack.pop();
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auto zero = ConstantInt::get(Types.word256, 0);
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auto iszero = builder.CreateICmpEQ(top, zero, "iszero");
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auto result = builder.CreateZExt(iszero, Types.word256);
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stack.push(result);
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break;
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}
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case Instruction::AND:
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{
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auto lhs = stack.pop();
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auto rhs = stack.pop();
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auto res = builder.CreateAnd(lhs, rhs);
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stack.push(res);
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break;
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}
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case Instruction::OR:
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{
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auto lhs = stack.pop();
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auto rhs = stack.pop();
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auto res = builder.CreateOr(lhs, rhs);
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stack.push(res);
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break;
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}
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case Instruction::XOR:
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{
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auto lhs = stack.pop();
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auto rhs = stack.pop();
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auto res = builder.CreateXor(lhs, rhs);
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stack.push(res);
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break;
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}
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case Instruction::BYTE:
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{
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const auto byteNum = stack.pop();
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auto value = stack.pop();
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/*
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if (byteNum < 32) - use select
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{
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value <<= byteNum*8
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value >>= 31*8
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push value
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}
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else push 0
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*/
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// TODO: Shifting by 0 gives wrong results as of this bug http://llvm.org/bugs/show_bug.cgi?id=16439
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auto shbits = builder.CreateShl(byteNum, builder.getIntN(256, 3));
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value = builder.CreateShl(value, shbits);
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value = builder.CreateLShr(value, builder.getIntN(256, 31 * 8));
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auto byteNumValid = builder.CreateICmpULT(byteNum, builder.getIntN(256, 32));
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value = builder.CreateSelect(byteNumValid, value, builder.getIntN(256, 0));
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stack.push(value);
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break;
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}
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case Instruction::SHA3:
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{
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auto inOff = stack.pop();
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auto inSize = stack.pop();
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auto hash = ext.sha3(inOff, inSize);
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stack.push(hash);
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}
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case Instruction::POP:
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{
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stack.pop();
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break;
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}
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case Instruction::PUSH1:
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case Instruction::PUSH2:
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case Instruction::PUSH3:
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case Instruction::PUSH4:
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case Instruction::PUSH5:
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case Instruction::PUSH6:
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case Instruction::PUSH7:
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case Instruction::PUSH8:
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case Instruction::PUSH9:
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case Instruction::PUSH10:
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case Instruction::PUSH11:
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case Instruction::PUSH12:
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case Instruction::PUSH13:
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case Instruction::PUSH14:
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case Instruction::PUSH15:
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case Instruction::PUSH16:
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case Instruction::PUSH17:
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case Instruction::PUSH18:
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case Instruction::PUSH19:
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case Instruction::PUSH20:
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case Instruction::PUSH21:
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case Instruction::PUSH22:
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case Instruction::PUSH23:
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case Instruction::PUSH24:
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case Instruction::PUSH25:
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case Instruction::PUSH26:
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case Instruction::PUSH27:
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case Instruction::PUSH28:
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case Instruction::PUSH29:
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case Instruction::PUSH30:
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case Instruction::PUSH31:
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case Instruction::PUSH32:
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{
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auto numBytes = static_cast<size_t>(inst)-static_cast<size_t>(Instruction::PUSH1) + 1;
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auto value = llvm::APInt(256, 0);
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for (decltype(numBytes) i = 0; i < numBytes; ++i) // TODO: Use pc as iterator
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{
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++currentPC;
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value <<= 8;
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value |= bytecode[currentPC];
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}
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auto c = builder.getInt(value);
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stack.push(c);
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break;
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}
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case Instruction::DUP1:
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case Instruction::DUP2:
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case Instruction::DUP3:
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case Instruction::DUP4:
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case Instruction::DUP5:
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case Instruction::DUP6:
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case Instruction::DUP7:
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case Instruction::DUP8:
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case Instruction::DUP9:
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case Instruction::DUP10:
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case Instruction::DUP11:
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case Instruction::DUP12:
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case Instruction::DUP13:
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case Instruction::DUP14:
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case Instruction::DUP15:
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case Instruction::DUP16:
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{
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auto index = static_cast<size_t>(inst)-static_cast<size_t>(Instruction::DUP1);
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stack.dup(index);
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break;
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}
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case Instruction::SWAP1:
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case Instruction::SWAP2:
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case Instruction::SWAP3:
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case Instruction::SWAP4:
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case Instruction::SWAP5:
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case Instruction::SWAP6:
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case Instruction::SWAP7:
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case Instruction::SWAP8:
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case Instruction::SWAP9:
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case Instruction::SWAP10:
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case Instruction::SWAP11:
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case Instruction::SWAP12:
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case Instruction::SWAP13:
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case Instruction::SWAP14:
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case Instruction::SWAP15:
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case Instruction::SWAP16:
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{
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auto index = static_cast<size_t>(inst)-static_cast<size_t>(Instruction::SWAP1) + 1;
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stack.swap(index);
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break;
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}
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case Instruction::MLOAD:
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{
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auto addr = stack.pop();
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auto word = memory.loadWord(addr);
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stack.push(word);
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break;
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}
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case Instruction::MSTORE:
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{
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auto addr = stack.pop();
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auto word = stack.pop();
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memory.storeWord(addr, word);
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break;
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}
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case Instruction::MSTORE8:
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{
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auto addr = stack.pop();
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auto word = stack.pop();
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memory.storeByte(addr, word);
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break;
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}
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case Instruction::MSIZE:
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{
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auto word = memory.getSize();
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stack.push(word);
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break;
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}
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case Instruction::SLOAD:
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{
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auto index = stack.pop();
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auto value = ext.store(index);
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stack.push(value);
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break;
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}
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case Instruction::SSTORE:
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{
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auto index = stack.pop();
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auto value = stack.pop();
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ext.setStore(index, value);
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break;
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}
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case Instruction::JUMP:
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{
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|
// The target address is computed at compile time,
|
|
// just pop it without looking...
|
|
stack.pop();
|
|
|
|
auto& targetBlock = basicBlocks.find(jumpTargets[currentPC])->second;
|
|
builder.CreateBr(targetBlock);
|
|
break;
|
|
}
|
|
|
|
case Instruction::JUMPI:
|
|
{
|
|
assert(currentPC + 1 < bytecode.size());
|
|
|
|
// The target address is computed at compile time,
|
|
// just pop it without looking...
|
|
stack.pop();
|
|
|
|
auto top = stack.pop();
|
|
auto zero = ConstantInt::get(Types.word256, 0);
|
|
auto cond = builder.CreateICmpNE(top, zero, "nonzero");
|
|
auto& targetBlock = basicBlocks.find(jumpTargets[currentPC])->second;
|
|
auto& followBlock = basicBlocks.find(currentPC + 1)->second;
|
|
builder.CreateCondBr(cond, targetBlock, followBlock);
|
|
break;
|
|
}
|
|
|
|
case Instruction::PC:
|
|
{
|
|
auto value = builder.getIntN(256, currentPC);
|
|
stack.push(value);
|
|
break;
|
|
}
|
|
|
|
case Instruction::ADDRESS:
|
|
{
|
|
auto value = ext.address();
|
|
stack.push(value);
|
|
break;
|
|
}
|
|
|
|
case Instruction::BALANCE:
|
|
{
|
|
auto address = stack.pop();
|
|
auto value = ext.balance(address);
|
|
stack.push(value);
|
|
break;
|
|
}
|
|
|
|
case Instruction::CALLER:
|
|
{
|
|
auto value = ext.caller();
|
|
stack.push(value);
|
|
break;
|
|
}
|
|
|
|
case Instruction::ORIGIN:
|
|
{
|
|
auto value = ext.origin();
|
|
stack.push(value);
|
|
break;
|
|
}
|
|
|
|
case Instruction::CALLVALUE:
|
|
{
|
|
auto value = ext.callvalue();
|
|
stack.push(value);
|
|
break;
|
|
}
|
|
|
|
case Instruction::CALLDATASIZE:
|
|
{
|
|
auto value = ext.calldatasize();
|
|
stack.push(value);
|
|
break;
|
|
}
|
|
|
|
case Instruction::CALLDATALOAD:
|
|
{
|
|
auto index = stack.pop();
|
|
auto value = ext.calldataload(index);
|
|
stack.push(value);
|
|
break;
|
|
}
|
|
|
|
case Instruction::GASPRICE:
|
|
{
|
|
auto value = ext.gasprice();
|
|
stack.push(value);
|
|
break;
|
|
}
|
|
|
|
case Instruction::CODESIZE:
|
|
{
|
|
auto value = builder.getIntN(256, bytecode.size());
|
|
stack.push(value);
|
|
break;
|
|
}
|
|
|
|
case Instruction::PREVHASH:
|
|
{
|
|
auto value = ext.prevhash();
|
|
stack.push(value);
|
|
break;
|
|
}
|
|
|
|
case Instruction::COINBASE:
|
|
{
|
|
auto value = ext.coinbase();
|
|
stack.push(value);
|
|
break;
|
|
}
|
|
|
|
case Instruction::TIMESTAMP:
|
|
{
|
|
auto value = ext.timestamp();
|
|
stack.push(value);
|
|
break;
|
|
}
|
|
|
|
case Instruction::NUMBER:
|
|
{
|
|
auto value = ext.number();
|
|
stack.push(value);
|
|
break;
|
|
}
|
|
|
|
case Instruction::DIFFICULTY:
|
|
{
|
|
auto value = ext.difficulty();
|
|
stack.push(value);
|
|
break;
|
|
}
|
|
|
|
case Instruction::GASLIMIT:
|
|
{
|
|
auto value = ext.gaslimit();
|
|
stack.push(value);
|
|
break;
|
|
}
|
|
|
|
case Instruction::CREATE:
|
|
{
|
|
auto endowment = stack.pop();
|
|
auto initOff = stack.pop();
|
|
auto initSize = stack.pop();
|
|
|
|
auto address = ext.create(endowment, initOff, initSize);
|
|
stack.push(address);
|
|
break;
|
|
}
|
|
|
|
case Instruction::CALL:
|
|
{
|
|
auto gas = stack.pop();
|
|
auto receiveAddress = stack.pop();
|
|
auto value = stack.pop();
|
|
auto inOff = stack.pop();
|
|
auto inSize = stack.pop();
|
|
auto outOff = stack.pop();
|
|
auto outSize = stack.pop();
|
|
|
|
auto ret = ext.call(gas, receiveAddress, value, inOff, inSize, outOff, outSize);
|
|
stack.push(ret);
|
|
break;
|
|
}
|
|
|
|
case Instruction::RETURN:
|
|
{
|
|
auto index = stack.pop();
|
|
auto size = stack.pop();
|
|
|
|
auto ret = builder.CreateTrunc(index, builder.getInt64Ty());
|
|
ret = builder.CreateShl(ret, 32);
|
|
size = builder.CreateTrunc(size, i32Ty);
|
|
size = builder.CreateZExt(size, builder.getInt64Ty());
|
|
ret = builder.CreateOr(ret, size);
|
|
|
|
builder.CreateRet(ret);
|
|
break;
|
|
}
|
|
|
|
case Instruction::SUICIDE:
|
|
{
|
|
auto address = stack.pop();
|
|
ext.suicide(address);
|
|
// Fall through
|
|
}
|
|
case Instruction::STOP:
|
|
{
|
|
builder.CreateRet(builder.getInt64(0));
|
|
break;
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (!builder.GetInsertBlock()->getTerminator()) // If block not terminated
|
|
{
|
|
if (basicBlock.begin() == bytecode.size()) // Special final block
|
|
{
|
|
builder.CreateRet(builder.getInt64(0));
|
|
}
|
|
else
|
|
{
|
|
auto iterCopy = basicBlockPairIt;
|
|
++iterCopy;
|
|
auto& next = iterCopy->second;
|
|
builder.CreateBr(next);
|
|
}
|
|
}
|
|
}
|
|
|
|
linkBasicBlocks();
|
|
|
|
return module;
|
|
}
|
|
|
|
|
|
void Compiler::linkBasicBlocks()
|
|
{
|
|
/// Helper function that finds basic block given LLVM basic block pointer
|
|
auto findBasicBlock = [this](llvm::BasicBlock* _llbb) -> BasicBlock&
|
|
{
|
|
// Name is used to get basic block index (index of first instruction)
|
|
// TODO: If basicBlocs are still a map - multikey map can be used
|
|
auto&& idxStr = _llbb->getName().substr(sizeof(BasicBlock::NamePrefix) - 2);
|
|
auto idx = std::stoul(idxStr);
|
|
return basicBlocks.find(idx)->second;
|
|
};
|
|
|
|
// Link basic blocks
|
|
for (auto&& p : basicBlocks)
|
|
{
|
|
BasicBlock& bb = p.second;
|
|
llvm::BasicBlock* llvmBB = bb.llvm();
|
|
|
|
size_t valueIdx = 0;
|
|
auto firstNonPhi = llvmBB->getFirstNonPHI();
|
|
for (auto instIt = llvmBB->begin(); &*instIt != firstNonPhi; ++instIt, ++valueIdx)
|
|
{
|
|
auto phi = llvm::cast<llvm::PHINode>(instIt);
|
|
for (auto predIt = llvm::pred_begin(llvmBB); predIt != llvm::pred_end(llvmBB); ++predIt)
|
|
{
|
|
auto& predBB = findBasicBlock(*predIt);
|
|
assert(valueIdx < predBB.getStack().size()); // TODO: Report error
|
|
phi->addIncoming(predBB.getStack().get(valueIdx), predBB);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|