From 6737f57a3d9e35cbc2e0610b29b6849e7068337b Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Sat, 2 Nov 2019 17:53:15 -0700
Subject: [PATCH] Start work on chapter 8 code for compilers

---
 08/CMakeLists.txt   | 13 +++++++++++++
 08/llvm_context.cpp | 18 ++++++++++++++++++
 08/llvm_context.hpp | 29 +++++++++++++++++++++++++++++
 3 files changed, 60 insertions(+)
 create mode 100644 08/llvm_context.cpp
 create mode 100644 08/llvm_context.hpp

diff --git a/08/CMakeLists.txt b/08/CMakeLists.txt
index 5e5dab4..bce62c8 100644
--- a/08/CMakeLists.txt
+++ b/08/CMakeLists.txt
@@ -1,8 +1,12 @@
 cmake_minimum_required(VERSION 3.1)
 project(compiler)
 
+# Find all the required packages
 find_package(BISON)
 find_package(FLEX)
+find_package(LLVM REQUIRED CONFIG)
+
+# Set up the flex and bison targets
 bison_target(parser
     ${CMAKE_CURRENT_SOURCE_DIR}/parser.y
     ${CMAKE_CURRENT_BINARY_DIR}/parser.cpp
@@ -12,6 +16,10 @@ flex_target(scanner
     ${CMAKE_CURRENT_BINARY_DIR}/scanner.cpp)
 add_flex_bison_dependency(scanner parser)
 
+# Find all the relevant LLVM components
+llvm_map_components_to_libnames(LLVM_LIBS core x86asmparser x86codegen)
+
+# Create compiler executable
 add_executable(compiler
     ast.cpp ast.hpp definition.cpp
     type_env.cpp type_env.hpp
@@ -24,5 +32,10 @@ add_executable(compiler
     ${FLEX_scanner_OUTPUTS}
     main.cpp
 )
+
+# Configure compiler executable
 target_include_directories(compiler PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 target_include_directories(compiler PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
+target_include_directories(compiler PUBLIC ${LLVM_DEFINITIONS})
+target_compile_definitions(compiler PUBLIC ${LLVM_DEFINITIONS})
+target_link_libraries(compiler ${LLVM_LIBS})
diff --git a/08/llvm_context.cpp b/08/llvm_context.cpp
new file mode 100644
index 0000000..a019db5
--- /dev/null
+++ b/08/llvm_context.cpp
@@ -0,0 +1,18 @@
+#include "llvm_context.hpp"
+#include <llvm/IR/DerivedTypes.h>
+
+void llvm_state::create_types() {
+    stack_type = llvm::StructType::create(ctx, "stack");
+    tag_type = llvm::IntegerType::getInt8Ty(ctx);
+    struct_types["node_base"] = llvm::StructType::create(ctx, "node_base");
+    struct_types["node_app"] = llvm::StructType::create(ctx, "node_app");
+    struct_types["node_num"] = llvm::StructType::create(ctx, "node_num");
+    struct_types["node_global"] = llvm::StructType::create(ctx, "node_global");
+    struct_types["node_ind"] = llvm::StructType::create(ctx, "node_ind");
+    struct_types["node_data"] = llvm::StructType::create(ctx, "node_data");
+    node_ptr_type = llvm::PointerType::getUnqual(struct_types.at("node_base"));
+}
+
+void llvm_state::create_functions() {
+    
+}
diff --git a/08/llvm_context.hpp b/08/llvm_context.hpp
new file mode 100644
index 0000000..3e6ab90
--- /dev/null
+++ b/08/llvm_context.hpp
@@ -0,0 +1,29 @@
+#pragma once
+#include <llvm/IR/DerivedTypes.h>
+#include <llvm/IR/Function.h>
+#include <llvm/IR/LLVMContext.h>
+#include <llvm/IR/IRBuilder.h>
+#include <llvm/IR/Module.h>
+#include <map>
+
+struct llvm_state {
+    llvm::LLVMContext ctx;
+    llvm::IRBuilder<> builder;
+    llvm::Module module;
+
+    std::map<std::string, llvm::Function*> functions;
+    std::map<std::string, llvm::StructType*> struct_types;
+
+    llvm::StructType* stack_type;
+    llvm::PointerType* node_ptr_type;
+    llvm::IntegerType* tag_type;
+
+    llvm_state()
+        : builder(ctx), module("bloglang", ctx) {
+        create_types();
+        create_functions();
+    }
+
+    void create_types();
+    void create_functions();
+};