From 6d1be9527e10a8519c2635c0c218d08fb1a35a57 Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Sun, 31 May 2020 14:37:33 -0700
Subject: [PATCH] Start working on a lifted version of a definition.

---
 12/CMakeLists.txt   |  1 +
 12/global_scope.cpp | 43 +++++++++++++++++++++++++++++++++++++++++++
 12/global_scope.hpp | 34 ++++++++++++++++++++++++++++++++++
 3 files changed, 78 insertions(+)
 create mode 100644 12/global_scope.cpp
 create mode 100644 12/global_scope.hpp

diff --git a/12/CMakeLists.txt b/12/CMakeLists.txt
index c3fb2ef..8a3f3c1 100644
--- a/12/CMakeLists.txt
+++ b/12/CMakeLists.txt
@@ -32,6 +32,7 @@ add_executable(compiler
     binop.cpp binop.hpp
     instruction.cpp instruction.hpp
     graph.cpp graph.hpp
+    global_scope.cpp global_scope.hpp
     ${BISON_parser_OUTPUTS}
     ${FLEX_scanner_OUTPUTS}
     main.cpp
diff --git a/12/global_scope.cpp b/12/global_scope.cpp
new file mode 100644
index 0000000..b0ae9c0
--- /dev/null
+++ b/12/global_scope.cpp
@@ -0,0 +1,43 @@
+#include "global_scope.hpp"
+#include "ast.hpp"
+
+void global_definition::compile() {
+    env_ptr new_env = env_ptr(new env_offset(0, nullptr));
+    for(auto it = params.rbegin(); it != params.rend(); it++) {
+        new_env = env_ptr(new env_var(*it, new_env));
+    }
+    body->compile(new_env, instructions);
+    instructions.push_back(instruction_ptr(new instruction_update(params.size())));
+    instructions.push_back(instruction_ptr(new instruction_pop(params.size())));
+}
+
+void global_definition::declare_llvm(llvm_context& ctx) {
+    generated_function = ctx.create_custom_function(name, params.size());
+}
+
+void global_definition::generate_llvm(llvm_context& ctx) {
+    ctx.builder.SetInsertPoint(&generated_function->getEntryBlock());
+    for(auto& instruction : instructions) {
+        instruction->gen_llvm(ctx, generated_function);
+    }
+    ctx.builder.CreateRetVoid();
+}
+
+global_definition_ptr& global_scope::add_definition(std::string n, std::vector<std::string> ps, ast_ptr b) {
+    auto occurence_it = occurence_count.find(n);
+    int occurence = 0;
+    if(occurence_it != occurence_count.end()) {
+        occurence = occurence_it->second + 1;
+    }
+    occurence_count[n] = occurence;
+
+    std::string final_name = n;
+    if (occurence != 0) {
+        final_name += "_";
+        final_name += std::to_string(occurence);
+    }
+
+    definitions.push_back(global_definition_ptr(
+        new global_definition(final_name, std::move(ps), std::move(b))));
+    return *definitions.rbegin();
+}
diff --git a/12/global_scope.hpp b/12/global_scope.hpp
new file mode 100644
index 0000000..28350fb
--- /dev/null
+++ b/12/global_scope.hpp
@@ -0,0 +1,34 @@
+#pragma once
+#include <memory>
+#include <string>
+#include <vector>
+#include <llvm/IR/Function.h>
+#include "instruction.hpp"
+
+struct ast;
+using ast_ptr = std::unique_ptr<ast>;
+
+struct global_definition {
+    std::string name;
+    std::vector<std::string> params;
+    ast_ptr body;
+
+    std::vector<instruction_ptr> instructions;
+    llvm::Function* generated_function;
+
+    global_definition(std::string n, std::vector<std::string> ps, ast_ptr b)
+        : name(std::move(n)), params(std::move(ps)), body(std::move(b)) {}
+
+    void compile();
+    void declare_llvm(llvm_context& ctx);
+    void generate_llvm(llvm_context& ctx);
+};
+
+using global_definition_ptr = std::unique_ptr<global_definition>;
+
+struct global_scope {
+    std::map<std::string, int> occurence_count;
+    std::vector<global_definition_ptr> definitions;
+
+    global_definition_ptr& add_definition(std::string n, std::vector<std::string> ps, ast_ptr b);
+};