From 3cfe211bf6a6b7c406e424f315b9ac8da34a32de Mon Sep 17 00:00:00 2001
From: Laborratte5 <laborratte5@gmail.com>
Date: Mon, 12 May 2025 16:32:45 +0200
Subject: [PATCH] Add outline for x68 asm code generation

---
 .../backend/x86asm/X86CodeGenerator.java      | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 src/main/java/edu/kit/kastel/vads/compiler/backend/x86asm/X86CodeGenerator.java

diff --git a/src/main/java/edu/kit/kastel/vads/compiler/backend/x86asm/X86CodeGenerator.java b/src/main/java/edu/kit/kastel/vads/compiler/backend/x86asm/X86CodeGenerator.java
new file mode 100644
index 0000000..ca37a80
--- /dev/null
+++ b/src/main/java/edu/kit/kastel/vads/compiler/backend/x86asm/X86CodeGenerator.java
@@ -0,0 +1,64 @@
+package edu.kit.kastel.vads.compiler.backend.x86asm;
+
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import edu.kit.kastel.vads.compiler.backend.CodeGenerator;
+import edu.kit.kastel.vads.compiler.backend.aasm.AasmRegisterAllocator;
+import edu.kit.kastel.vads.compiler.backend.regalloc.Register;
+import edu.kit.kastel.vads.compiler.backend.regalloc.RegisterAllocator;
+import edu.kit.kastel.vads.compiler.ir.IrGraph;
+import edu.kit.kastel.vads.compiler.ir.node.Node;
+
+
+public class X86CodeGenerator implements CodeGenerator {
+
+    private static final String MAIN_ASM = """
+        .global main
+        .global _main
+        .text
+        main:
+        call _main
+        # move the return value into the first argument for the syscall
+        movq %rax, %rdi
+        # move the exit syscall number into rax
+        movq $0x3C, %rax
+        syscall
+        _main:
+        # your generated code here
+        """;
+
+    public String generateCode(List<IrGraph> program) {
+        StringBuilder builder = new StringBuilder();
+        for (IrGraph graph : program) {
+            RegisterAllocator allocator = new AasmRegisterAllocator();
+            Map<Node, Register> registers = allocator.allocateRegisters(graph);
+
+            builder.append(MAIN_ASM);
+            generateForGraph(graph, builder, registers);
+        }
+        return builder.toString();
+    }
+
+    private void generateForGraph(IrGraph graph, StringBuilder builder, Map<Node, Register> registers) {
+        Set<Node> visited = new HashSet<>();
+        scan(graph.endBlock(), visited, builder, registers);
+    }
+
+    private void scan(Node node, Set<Node> visited, StringBuilder builder, Map<Node, Register> registers) {
+        for (Node predecessor : node.predecessors()) {
+            if (visited.add(predecessor)) {
+                scan(predecessor, visited, builder, registers);
+            }
+        }
+
+        // TODO: implement code generation
+        switch (node) {
+            default:
+                throw new UnsupportedOperationException("Codegeneration for '" + node.toString() + "' is not implemented.");
+        }
+    }
+
+}