StubGenerator Class Reference

#include <ResultSetReductionInterpreterStubs.h>

Public Types
using	Stub = ReductionInterpreter::EvalValue(*)(void *output_handle, const void *inputs_handle)
using	InputsType = std::vector< ReductionInterpreter::EvalValue >

Static Public Member Functions
static Stub	generateStub (const size_t executor_id, const std::string &name, const std::vector< Type > &arg_types, const Type ret_type, const bool is_external)

Detailed Description

Definition at line 25 of file ResultSetReductionInterpreterStubs.h.

Member Typedef Documentation

using StubGenerator::InputsType = std::vector<ReductionInterpreter::EvalValue>

Definition at line 31 of file ResultSetReductionInterpreterStubs.h.

using StubGenerator::Stub = ReductionInterpreter::EvalValue (*)(void* output_handle, const void* inputs_handle)

Definition at line 30 of file ResultSetReductionInterpreterStubs.h.

Member Function Documentation

StubGenerator::Stub StubGenerator::generateStub ( const size_t  executor_id, const std::string &  name, const std::vector< Type > &  arg_types, const Type  ret_type, const bool  is_external  )

static

Definition at line 184 of file ResultSetReductionInterpreterStubs.cpp.

References CHECK, CPU, anonymous_namespace{ResultSetReductionInterpreterStubs.cpp}::create_stub_function(), logger::FATAL, CodeGenerator::generateNativeCPUCode(), get_int_type(), anonymous_namespace{ResultSetReductionInterpreterStubs.cpp}::get_stub_read_argument_name(), Executor::getExecutor(), QueryEngine::getInstance(), Int32, Int8, is_integer_type(), is_pointer_type(), llvm_type(), LOG, ReductionJIT, verify_function_ir(), and Void.

Referenced by ReductionInterpreterImpl::bindStub().

                                                                        {
  // Multiple executors may trigger the generation of the same
  // stub. We'll use get_or_wait/put methods of code cache accessor to
  // let the first executor to generate the stub while other executors
  // will wait until the stub has been put to the code cache.

  auto executor = Executor::getExecutor(executor_id);
  const auto stub_name = name + "_stub";
  CodeCacheKey key{stub_name};

  // get_or_wait locks globally unless (i) this is the first attempt
  // to compile for given key, or (ii) when key exists in code cache.
  const auto compilation_context =
      QueryEngine::getInstance()->s_stubs_accessor->get_or_wait(key);
  if (compilation_context) {
    return reinterpret_cast<StubGenerator::Stub>(compilation_context->get()->func());
  }

  // compilation is locked per executor
  Executor::CgenStateManager cgenstate_manager(*executor.get());
  auto cgen_state = executor->getCgenStatePtr();
  cgen_state->set_module_shallow_copy(executor->get_rt_module());
  const auto function = create_stub_function(stub_name, cgen_state);
  CHECK(function);
  auto& ctx = cgen_state->context_;
  std::vector<llvm::Value*> callee_args;
  auto inputs_it = function->arg_begin() + 1;
  for (size_t i = 0; i < arg_types.size(); ++i) {
    const auto arg_type = arg_types[i];
    const auto read_arg_name = get_stub_read_argument_name(arg_type);
    const auto llvm_arg_type = llvm_type(arg_type, ctx);
    auto callee_arg = cgen_state->emitExternalCall(
        read_arg_name, llvm_arg_type, {&*inputs_it, cgen_state->llInt<int32_t>(i)});
    if (is_integer_type(arg_type)) {
      CHECK(llvm_arg_type->isIntegerTy());
      callee_arg = cgen_state->ir_builder_.CreateTrunc(callee_arg, llvm_arg_type);
    } else if (is_pointer_type(arg_type)) {
      CHECK(llvm_arg_type->isPointerTy());
      callee_arg = cgen_state->ir_builder_.CreateBitCast(callee_arg, llvm_arg_type);
    }
    callee_args.push_back(callee_arg);
  }
  const auto llvm_ret_type = llvm_type(ret_type, ctx);
  auto value = is_external
                   ? cgen_state->emitExternalCall(name, llvm_ret_type, callee_args)
                   : cgen_state->emitCall(name, callee_args);
  auto output = &*(function->arg_begin());
  auto void_type = llvm::Type::getVoidTy(ctx);
  std::string write_arg_name{"write_stub_result_"};
  switch (ret_type) {
    case Type::Int8: {
      write_arg_name += "int";
      const auto i64_type = get_int_type(64, cgen_state->context_);
      value = cgen_state->ir_builder_.CreateSExt(value, i64_type);
      break;
    }
    case Type::Int32: {
      write_arg_name += "int";
      const auto i64_type = get_int_type(64, cgen_state->context_);
      value = cgen_state->ir_builder_.CreateSExt(value, i64_type);
      break;
    }
    case Type::Void: {
      value = nullptr;
      break;
    }
    default: {
      LOG(FATAL) << "Invalid type: " << static_cast<int>(ret_type);
    }
  }
  if (value) {
    cgen_state->emitExternalCall(write_arg_name, void_type, {output, value});
  }
  cgen_state->ir_builder_.CreateRetVoid();
  verify_function_ir(function);
  CompilationOptions co{
      ExecutorDeviceType::CPU, false, ExecutorOptLevel::ReductionJIT, false};
  auto ee = CodeGenerator::generateNativeCPUCode(function, {function}, co);
  auto cpu_compilation_context = std::make_shared<CpuCompilationContext>(std::move(ee));
  cpu_compilation_context->setFunctionPointer(function);
  auto func_ptr = reinterpret_cast<StubGenerator::Stub>(cpu_compilation_context->func());
  QueryEngine::getInstance()->s_stubs_accessor->reset(key,
                                                      std::move(cpu_compilation_context));
  return func_ptr;
}

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The documentation for this class was generated from the following files:

• /home/jenkins-slave/workspace/core-os-doxygen/QueryEngine/ResultSetReductionInterpreterStubs.h
• /home/jenkins-slave/workspace/core-os-doxygen/QueryEngine/ResultSetReductionInterpreterStubs.cpp