1 files changed, 152 insertions, 0 deletions
diff --git a/src/x86_64/codegen.c b/src/x86_64/codegen.c
new file mode 100644
index 0000000..6cafda0
--- /dev/null
+++ b/src/x86_64/codegen.c
@@ -0,0 +1,152 @@
+/*
+ * Copyright (C) 2025 Johnny Richard <johnny@johnnyrichard.com>
+ *
+ * SPDX-License-Identifier: LGPL-3.0-or-later
+ *
+ * This file is part of obe.
+ *
+ * obe is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ *
+ * obe is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with obe. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <obe/arena.h>
+#include <obe/array.h>
+#include <obe/ir.h>
+#include <obe/x86_64/codegen.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static void
+obe_x86_64_codegen_emit_function(obe_ir_function_t *fn, FILE *out)
+{
+    fprintf(out, PRIs ":\n", PRIsARG(fn->name));
+    fprintf(out, "\tpush %%rbp\n");
+    fprintf(out, "\tmov %%rsp, %%rbp\n");
+
+    size_t insts_length = obe_array_length(fn->instrs);
+    for (size_t i = 0; i < insts_length; ++i) {
+        obe_ir_inst_t inst = fn->instrs[i];
+        switch (inst.kind) {
+            case OBE_IR_INST_RETURN:
+                {
+                    if (inst.operand1.kind == OBE_IR_OPERAND_LITERAL) {
+                        fprintf(out, "\tmov $%s, %%rax\n", inst.operand1.value);
+                    } else {
+                        fprintf(stderr, "Operation kind not supported\n");
+                        exit(EXIT_FAILURE);
+                    }
+                } break;
+            default:
+                {
+                    fprintf(stderr, "Instruction not supported\n");
+                    exit(EXIT_FAILURE);
+                }
+        }
+    }
+
+    fprintf(out, "\tleave\n");
+    fprintf(out, "\tret\n");
+}
+
+void
+_obe_x86_64_codegen_emit(obe_ir_translation_unit_t* tu, FILE *out)
+{
+    // FIXME: Add syntax to configure globl
+    fprintf(out, ".globl main\n");
+
+    fprintf(out, ".text\n");
+    size_t funcs_length = obe_array_length(tu->funcs);
+    for (size_t i = 0; i < funcs_length; ++i) {
+        obe_ir_function_t fn = tu->funcs[i];
+        obe_x86_64_codegen_emit_function(&fn, out);
+    }
+}
+
+typedef struct obe_basic_block obe_basic_block_t;
+typedef struct obe_cfg obe_cfg_t;
+typedef struct obe_int_graph obe_int_graph_t;
+
+struct obe_basic_block {
+    obe_string_t id;
+    obe_ir_inst_t *instrs;
+    struct obe_basic_block *pred;
+    struct obe_basic_block *succ;
+};
+
+struct obe_cfg {
+    obe_basic_block_t *init_block;
+    obe_basic_block_t *curr_block;
+};
+
+
+typedef struct obe_int_edge {
+    size_t v1;
+    size_t v2;
+} obe_int_edge_t;
+
+struct obe_int_graph {
+    obe_int_edge_t *edges;
+};
+
+obe_int_graph_t
+create_interference_graph(obe_cfg_t *cfg, obe_arena_t *arena)
+{
+    obe_int_graph_t graph = {0};
+    graph.edges = obe_array(arena, obe_int_edge_t);
+
+    return graph;
+}
+
+void
+obe_x86_64_codegen_emit(obe_ir_translation_unit_t* tu, FILE *out)
+{
+    // FIXME: Create a valid CFG
+    obe_arena_t arena = {0};
+    obe_cfg_t cfg = {0};
+if (cfg.init_block == NULL) {
+        cfg.init_block = obe_arena_alloc(&arena, sizeof(obe_basic_block_t));
+        cfg.curr_block = cfg.init_block;
+        cfg.curr_block->instrs = obe_array(&arena, obe_ir_inst_t);
+    }
+
+    size_t funcs_length = obe_array_length(tu->funcs);
+    for (size_t i = 0; i < funcs_length; ++i) {
+        obe_ir_function_t fn = tu->funcs[i];
+
+        size_t instrs_length = obe_array_length(fn.instrs);
+        for (size_t j = 0; j < instrs_length; ++j) {
+            obe_ir_inst_t inst = fn.instrs[j];
+            switch (inst.kind) {
+                default:
+                    {
+                        obe_array_append(cfg.curr_block->instrs, inst);
+                    }
+            }
+        }
+    }
+
+    // TODO: Register Allocation
+    // liveness analysis (create interference graph)
+    size_t instrs_length = obe_array_length(cfg.init_block->instrs);
+    for (size_t i = 0; i < instrs_length; ++i) {
+        obe_ir_inst_t inst = cfg.init_block->instrs[i];
+        // asm("int3");
+        printf("inst = %d\n", inst.kind);
+    }
+    // TODO: create_interference_graph(&cfg, &arena);
+
+
+    // TODO: Emit assembly code
+    
+    obe_arena_free(&arena);
+}