From 268ad7e0db894c8fbc445a0ec64bb50d0d0b7c48 Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Fri, 22 Apr 2022 19:38:09 -0300
Subject: Introduce scaffolding for basm IR

---
 src/ir.c   | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/main.c |  1 +
 2 files changed, 86 insertions(+)
 create mode 100644 src/ir.c

diff --git a/src/ir.c b/src/ir.c
new file mode 100644
index 0000000..4c85792
--- /dev/null
+++ b/src/ir.c
@@ -0,0 +1,85 @@
+typedef enum Operator {
+    // Arithmetic ops.
+    OP_ADD,
+    OP_SUB,
+    OP_MUL,
+    OP_DIV,
+    OP_MOD,
+
+    // Load/store/copy operations.
+    OP_LD8,
+    OP_LD16,
+    OP_LD32,
+    OP_LD64,
+    OP_ST8,
+    OP_ST16,
+    OP_ST32,
+    OP_ST64,
+    OP_CP8,
+    OP_CP16,
+    OP_CP32,
+    OP_CP64,
+
+    // Bit fiddling operations.
+    OP_NOT,
+    OP_AND,
+    OP_OR,
+    OP_XOR,
+    OP_LSHIFT,
+    OP_RSHIFT,
+    OP_LROT,
+    OP_RROT,
+
+    // (Un)conditional jump operations.
+    OP_LABEL,
+    OP_JMP,
+    OP_JMP_EQ,
+    OP_JMP_NEQ,
+    OP_JMP_GT,
+    OP_JMP_LT,
+    OP_JMP_GE,
+    OP_JMP_LE,
+} Operator;
+
+typedef enum OperandType {
+    OP_TYPE_REG,
+    OP_TYPE_CONST,
+    OP_TYPE_LABEL,
+} OperandType;
+
+typedef struct Operand {
+    OperandType type;
+    union {
+        struct {
+            size_t num;
+        } reg;
+
+        struct {
+            size_t num;
+        } label;
+
+        struct {
+            union {
+                u64 uval;
+                s64 sval;
+            };
+        } const;
+    };
+} Operand;
+
+typedef struct Instruction {
+    Operator op;
+    Operand dst;
+    Operand src_a;
+    Operand src_b;
+} Instruction;
+
+typedef struct LineInfo {
+    size_t line;
+    size_t col;
+} LineInfo;
+
+typedef struct ProgramBASM {
+    Instruction *inst;
+    LineInfo *lines;
+} ProgramBASM;
diff --git a/src/main.c b/src/main.c
index 7878c57..0fbabdb 100644
--- a/src/main.c
+++ b/src/main.c
@@ -10,6 +10,7 @@
 #include "nodes.c"
 #include "parser.c"
 #include "semantic.c"
+#include "ir.c"
 #include "viz.c"
 
 typedef enum ExecMode {
-- 
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