Cleanup some formatting code, add tips

Author: Lee-Janggun

README.md

@@ -239,3 +239,8 @@ make run
 - Submit the corresponding files to [gg.kaist.ac.kr](https://gg.kaist.ac.kr).
 - Run `./scripts/make-submissions.sh` to generate `irgen.zip` to `final.zip`,
   which you should submit for homework 2 to the final project.
+
+## Running on a local machine
+
+- https://github.com/kaist-cp/cs420/issues/314
+- https://github.com/kaist-cp/cs420/issues/460

src/asm/mod.rs

@@ -223,22 +223,9 @@ impl fmt::Display for Instruction {
                     ",rtz"
                 } else {
                     ""
-                }
-                .to_string();
-
-                write!(
-                    f,
-                    "{}\t{},{}{}{}",
-                    instr,
-                    rd,
-                    rs1,
-                    if let Some(rs2) = rs2 {
-                        format!(",{rs2}")
-                    } else {
-                        "".to_string()
-                    },
-                    rounding_mode
-                )
+                };
+                let rs2 = rs2.map(|rs2| format!(",{rs2}")).unwrap_or_default();
+                write!(f, "{instr}\t{rd},{rs1}{rs2}{rounding_mode}")
             }
             Self::IType {
                 instr,
@@ -263,7 +250,7 @@ impl fmt::Display for Instruction {
                 rs1,
                 rs2,
                 imm,
-            } => write!(f, "{}\t{},{}, {}", instr, rs1, rs2, imm.0,),
+            } => write!(f, "{instr}\t{rs1},{rs2}, {imm}"),
             Self::UType { instr, rd, imm } => write!(f, "{instr}\t{rd}, {imm}",),
             Self::Pseudo(pseudo) => write!(f, "{pseudo}"),
         }

src/asm/write_asm.rs

@@ -62,7 +62,7 @@ impl WriteLine for Variable {
 impl WriteLine for Block {
     fn write_line(&self, indent: usize, write: &mut dyn Write) -> Result<()> {
         if let Some(label) = &self.label {
-            writeln!(write, "{}:", label.0)?;
+            writeln!(write, "{label}:")?;
         }
 
         for instruction in &self.instructions {

src/ir/visualize.rs

@@ -23,30 +23,25 @@ impl Translate<TranslationUnit> for Visualizer {
 
         // TODO: Add variables and structs information
         for (name, decl) in &source.decls {
-            match decl {
-                Declaration::Variable { .. } => {}
-                Declaration::Function {
-                    signature,
-                    definition,
-                } => {
-                    let Some(definition) = definition else {
-                        continue;
-                    };
-                    let subgraph = self.translate_function(name, signature, definition)?;
-                    subgraphs.push(subgraph);
-                }
+            if let Declaration::Function {
+                signature,
+                definition: Some(definition),
+            } = decl
+            {
+                let subgraph = self.translate_function(name, signature, definition)?;
+                subgraphs.push(subgraph);
             }
         }
 
         let mut edges = Vec::new();
 
         // Add edges between subgraphs
         for (name, decl) in &source.decls {
-            if let Declaration::Function { definition, .. } = decl {
-                let Some(definition) = definition else {
-                    continue;
-                };
-
+            if let Declaration::Function {
+                definition: Some(definition),
+                ..
+            } = decl
+            {
                 for (bid, block) in &definition.blocks {
                     for (iid, instruction) in block.instructions.iter().enumerate() {
                         if let Instruction::Call { callee, .. } = &instruction.inner {