feat: implement initial LLVM compiler backend and add multi-platform release workflow via GitHub Actions

Author: ProgrammerKR

.github/workflows/build.yml

@@ -37,7 +37,10 @@ jobs:
 
       - name: Install LLVM (Windows)
         if: matrix.os == 'windows-latest'
-        run: choco install llvm -y
+        run: |
+          choco install llvm -y
+          echo "C:/Program Files/LLVM/bin" >> $GITHUB_PATH
+          echo "LLVM_DIR=C:/Program Files/LLVM/lib/cmake/llvm" >> $GITHUB_ENV
 
       - name: Configure
         shell: bash
@@ -46,7 +49,6 @@ jobs:
             -DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }} \
             -DBUILD_TESTS=OFF \
             -DBUILD_BENCH=OFF \
-            -DLLVM_DIR="C:/Program Files/LLVM/lib/cmake/llvm" \
             -DCMAKE_PREFIX_PATH="C:/Program Files/LLVM"
 
       - name: Build (verbose)

.github/workflows/release.yml

@@ -48,14 +48,15 @@ jobs:
 
       - name: Install LLVM (Windows)
         if: matrix.os == 'windows-latest'
-        run: choco install llvm -y
+        run: |
+          choco install llvm -y
+          echo "C:/Program Files/LLVM/bin" >> $GITHUB_PATH
+          echo "LLVM_DIR=C:/Program Files/LLVM/lib/cmake/llvm" >> $GITHUB_ENV
 
       - name: Configure CMake
         shell: bash
         run: |
-          cmake -S . -B build -DCMAKE_BUILD_TYPE=Release \
-            -DLLVM_DIR="C:/Program Files/LLVM/lib/cmake/llvm" \
-            -DCMAKE_PREFIX_PATH="C:/Program Files/LLVM"
+          cmake -S . -B build -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH="C:/Program Files/LLVM"
 
       - name: Build
         shell: bash

src/compiler/backend_llvm.cpp

@@ -1,11 +1,17 @@
+#include "../../include/backend_llvm.h"
 #include "../../include/object.h"
+#include <llvm/IR/IRBuilder.h>
+#include <llvm/IR/LLVMContext.h>
+#include <llvm/IR/Module.h>
+#include <llvm/IR/Verifier.h>
+#include <llvm/Support/raw_ostream.h>
 #include <vector>
 #include <map>
 #include <iostream>
+#include <memory>
 
 // Do NOT use 'using namespace llvm;' due to clash with our 'Value' type.
 
-
 class LLVMEmitter {
     std::unique_ptr<llvm::LLVMContext> Context;
     std::unique_ptr<llvm::Module> ModuleOb;
@@ -218,3 +224,4 @@ extern "C" void emitLLVM(IRModule* module) {
     LLVMEmitter emitter;
     emitter.emitModule(module);
 }
+