Change decode to instruction name file

src/instruction.c

@@ -0,0 +1,9 @@
+#include "instruction.h"
+
+unsigned int size(Instruction ins)
+{
+	if (ins.op1_addr == Imm)
+		return 2;
+	else
+		return 1;
+}

src/decode.h → src/instruction.h

@@ -1,5 +1,5 @@
-#ifndef DECODE_H
-#define DECODE_H
+#ifndef INS_H
+#define INS_H
 
 //  Structure of the 63-bit that form the first word of each instruction.
 //  See Cairo whitepaper, page 32 - https://eprint.iacr.org/2021/1063.pdf.
@@ -73,19 +73,32 @@ enum Opcode
 	Ret,
 };
 
+// Typedef definitions
+
+typedef enum Res Res;
+typedef enum Opcode Opcode;
+typedef enum Op1Addr Op1Addr;
+typedef enum Register Register;
+typedef enum PcUpdate PcUpdate;
+typedef enum ApUpdate ApUpdate;
+typedef enum FpUpdate FpUpdate;
+typedef struct Instruction Instruction;
+
 struct Instruction
 {
 	int off0;
 	int off1;
 	int off2;
-	enum Register dst_reint;
-	enum Register op0_register;
-	enum Op1Addr op1_addr;
-	enum Res res;
-	enum PcUpdate pc_update;
-	enum ApUpdate ap_update;
-	enum FpUpdate fp_update;
-	enum Opcode opcode;
+	Register dst_reint;
+	Register op0_register;
+	Op1Addr op1_addr;
+	Res res;
+	PcUpdate pc_update;
+	ApUpdate ap_update;
+	FpUpdate fp_update;
+	Opcode opcode;
 };
 
-#endif
+unsigned int size(Instruction ins);
+
+#endif