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274 lines
6.8 KiB
274 lines
6.8 KiB
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#include "Compiler.h"
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#include <llvm/IR/IRBuilder.h>
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#include <libevmface/Instruction.h>
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#include "Memory.h"
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#include "Stack.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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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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auto mainFuncType = FunctionType::get(llvm::Type::getInt32Ty(context), false);
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auto mainFunc = Function::Create(mainFuncType, Function::ExternalLinkage, "main", module.get());
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auto entryBlock = BasicBlock::Create(context, "entry", mainFunc);
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builder.SetInsertPoint(entryBlock);
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// Init stack and memory
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auto stack = Stack(builder, module.get());
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auto memory = Memory(builder, module.get());
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auto ext = Ext(builder);
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for (auto pc = bytecode.cbegin(); pc != bytecode.cend(); ++pc)
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{
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using dev::eth::Instruction;
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auto inst = static_cast<Instruction>(*pc);
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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::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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++pc;
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value <<= 8;
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value |= *pc;
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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<uint32_t>(inst) - static_cast<uint32_t>(Instruction::DUP1);
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auto value = stack.get(index);
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stack.push(value);
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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<uint32_t>(inst) - static_cast<uint32_t>(Instruction::SWAP1) + 1;
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auto loValue = stack.get(index);
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auto hiValue = stack.get(0);
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stack.set(index, hiValue);
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stack.set(0, loValue);
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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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}
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}
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builder.CreateRet(ConstantInt::get(Type::getInt32Ty(context), 0));
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return module;
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}
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}
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