preliminary work on sea of nodes based intermediate representation.

ir.h

@@ -0,0 +1,63 @@
+#ifndef IR_H
+#define IR_H
+
+#include "utils.h"
+#include "parser.h"
+
+struct _ir_node;
+struct symbol_def {
+	struct _ir_node *node;
+	bool is_lvalue;
+};
+
+typedef struct { char *key; struct symbol_def *value; } symbol_table;
+
+typedef enum {
+	OC_START,
+	OC_ADD,
+	OC_SUB,
+	OC_MUL,
+	OC_DIV,
+	OC_MOD,
+	OC_BAND,
+	OC_BOR,
+	OC_BXOR,
+	OC_NEG,
+	OC_EQ,
+
+	OC_CONST_INT,
+	OC_CONST_FLOAT,
+
+	OC_FRAME_PTR,
+	OC_ADDR,
+
+	OC_STORE,
+	OC_LOAD,
+	
+	OC_REGION,
+	OC_PHI,
+
+	OC_IF,
+	OC_PROJ,
+
+	OC_STOP,
+	OC_RETURN,
+
+	OC_SCOPE,
+} opcode;
+
+typedef struct _ir_node {
+	opcode code;
+	usize id;
+	struct _ir_node **in;
+	struct _ir_node **out;
+	union {
+		i64 const_int;
+		f64 const_float;
+		symbol_table **symbol_tables;
+	} data;
+} ir_node;
+
+void ir_build(ast_node *ast);
+
+#endif