/*

* Copyright 2017 MapD Technologies, Inc.

*

* Licensed 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.

*/

#include "Codec.h"

#include "LLVMGlobalContext.h"

#include <glog/logging.h>

#include <llvm/IR/Constants.h>

#include <llvm/IR/Instruction.h>

#include <llvm/IR/Value.h>

#include <llvm/IR/Module.h>

FixedWidthInt::FixedWidthInt(const size_t byte_width) : byte_width_{byte_width} {}

llvm::Instruction* FixedWidthInt::codegenDecode(llvm::Value* byte_stream,

llvm::Value* pos,

llvm::Module* module) const {

auto& context = getGlobalLLVMContext();

auto f = module->getFunction("fixed_width_int_decode");

CHECK(f);

llvm::Value* args[] = {byte_stream, llvm::ConstantInt::get(llvm::Type::getInt32Ty(context), byte_width_), pos};

return llvm::CallInst::Create(f, args);

}

FixedWidthUnsigned::FixedWidthUnsigned(const size_t byte_width) : byte_width_{byte_width} {}

llvm::Instruction* FixedWidthUnsigned::codegenDecode(llvm::Value* byte_stream,

llvm::Value* pos,

llvm::Module* module) const {

auto& context = getGlobalLLVMContext();

auto f = module->getFunction("fixed_width_unsigned_decode");

CHECK(f);

llvm::Value* args[] = {byte_stream, llvm::ConstantInt::get(llvm::Type::getInt32Ty(context), byte_width_), pos};

return llvm::CallInst::Create(f, args);

}

DiffFixedWidthInt::DiffFixedWidthInt(const size_t byte_width, const int64_t baseline)

: byte_width_{byte_width}, baseline_{baseline} {}

llvm::Instruction* DiffFixedWidthInt::codegenDecode(llvm::Value* byte_stream,

llvm::Value* pos,

llvm::Module* module) const {

auto& context = getGlobalLLVMContext();

auto f = module->getFunction("diff_fixed_width_int_decode");

CHECK(f);

llvm::Value* args[] = {byte_stream,

llvm::ConstantInt::get(llvm::Type::getInt32Ty(context), byte_width_),

llvm::ConstantInt::get(llvm::Type::getInt32Ty(context), baseline_),

pos};

return llvm::CallInst::Create(f, args);

}

FixedWidthReal::FixedWidthReal(const bool is_double) : is_double_(is_double) {}

llvm::Instruction* FixedWidthReal::codegenDecode(llvm::Value* byte_stream,

llvm::Value* pos,

llvm::Module* module) const {

auto f = module->getFunction(is_double_ ? "fixed_width_double_decode" : "fixed_width_float_decode");

CHECK(f);

llvm::Value* args[] = {byte_stream, pos};

return llvm::CallInst::Create(f, args);

}