zhiics commented on a change in pull request #4657: [CodeGen] Generate blob use LLVM directly URL: https://github.com/apache/incubator-tvm/pull/4657#discussion_r364923528
########## File path: src/codegen/llvm/codegen_blob.cc ########## @@ -0,0 +1,163 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +/*! + * \file codegen_blob.cc + */ +#ifdef TVM_LLVM_VERSION +#include <tvm/runtime/module.h> +#include <cstring> +#include "codegen_blob.h" + +namespace tvm { +namespace codegen { + +std::pair<std::unique_ptr<llvm::Module>, + std::shared_ptr<llvm::LLVMContext>> CodeGenBlob(const std::string& data, + bool system_lib, + const std::string& target) { + InitializeLLVM(); + auto tm = GetLLVMTargetMachine(std::string("-target ") + target); + auto target_triple = tm->getTargetTriple(); + auto ctx = std::make_shared<llvm::LLVMContext>(); + std::string module_name = "devc"; + std::unique_ptr<llvm::Module> module(new llvm::Module(module_name, *ctx)); + module->setTargetTriple(target_triple.str()); + module->setDataLayout(tm->createDataLayout()); + auto* blob_value = llvm::ConstantDataArray::getString(*ctx, data, false); + auto* tvm_dev_mblob = new llvm::GlobalVariable(*module, blob_value->getType(), true, + llvm::GlobalValue::ExternalLinkage, blob_value, + runtime::symbol::tvm_dev_mblob, nullptr, + llvm::GlobalVariable::NotThreadLocal, 0); + +#if TVM_LLVM_VERSION >= 100 + tvm_dev_mblob->setAlignment(llvm::Align(1)); +#else + tvm_dev_mblob->setAlignment(1); +#endif + + if (target_triple.isOSWindows()) { + tvm_dev_mblob->setDLLStorageClass(llvm::GlobalVariable::DLLExportStorageClass); + } + + if (system_lib) { + // LLVM type helper + auto void_ty = llvm::Type::getVoidTy(*ctx); + auto int32_ty = llvm::Type::getInt32Ty(*ctx); + auto int8_ty = llvm::Type::getInt8Ty(*ctx); + auto int8_ptr_ty = int8_ty->getPointerTo(0); + + llvm::Constant* constant_zero = llvm::Constant::getNullValue(int32_ty); + auto* tvm_dev_mblob_reg = + new llvm::GlobalVariable(*module, int32_ty, + false, llvm::GlobalValue::InternalLinkage, + constant_zero, + std::string(runtime::symbol::tvm_dev_mblob) + "_reg_"); + auto tvm_dev_mblob_reg_alignment = module->getDataLayout().getABITypeAlignment(int32_ty); +#if TVM_LLVM_VERSION >= 100 + tvm_dev_mblob_reg->setAlignment(llvm::Align(tvm_dev_mblob_reg_alignment)); +#else + tvm_dev_mblob_reg->setAlignment(tvm_dev_mblob_reg_alignment); +#endif + + auto* tvm_dev_mblob_string_ty = + llvm::ArrayType::get(int8_ty, std::strlen(runtime::symbol::tvm_dev_mblob) + 1); + auto* tvm_dev_mblob_string_value = + llvm::ConstantDataArray::getString(*ctx, runtime::symbol::tvm_dev_mblob, true); + auto* tvm_dev_mblob_string = + new llvm::GlobalVariable(*module, tvm_dev_mblob_string_ty, + true, llvm::GlobalValue::PrivateLinkage, + tvm_dev_mblob_string_value, + std::string(runtime::symbol::tvm_dev_mblob) + ".str"); +#if TVM_LLVM_VERSION >= 100 + tvm_dev_mblob_string->setAlignment(llvm::Align(1)); +#else + tvm_dev_mblob_string->setAlignment(1); +#endif + + // Global init function + llvm::Function* init_fn = llvm::Function::Create(llvm::FunctionType::get(void_ty, false), + llvm::GlobalValue::InternalLinkage, + llvm::Twine("_GLOBAL__sub_I_", module_name), + module.get()); + + // Create variable initialization function. + llvm::Function* var_init_fn = llvm::Function::Create(llvm::FunctionType::get(void_ty, false), + llvm::GlobalValue::InternalLinkage, + llvm::Twine("__cxx_global_var_init"), + module.get()); + + // Create TVMBackendRegisterSystemLibSymbol function + llvm::Function* tvm_backend_fn = + llvm::Function::Create(llvm::FunctionType::get(int32_ty, {int8_ptr_ty, int8_ptr_ty}, false), + llvm::GlobalValue::ExternalLinkage, + llvm::Twine("TVMBackendRegisterSystemLibSymbol"), + module.get()); + + // Set necessary fn sections + auto get_static_init_section_specifier = [&target_triple]() -> std::string { + if (target_triple.isOSLinux()) { + return ".text.startup"; + } else if (target_triple.isOSDarwin()) { + return "__TEXT,__StaticInit,regular,pure_instructions"; + } else { + return ""; + } + }; + + auto static_init_section_specifier = get_static_init_section_specifier(); + + if (!static_init_section_specifier.empty()) { + init_fn->setSection(static_init_section_specifier); + var_init_fn->setSection(static_init_section_specifier); + } + + Review comment: remove this blank line ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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