diff --git a/ceno_emul/src/platform.rs b/ceno_emul/src/platform.rs
index c8af79ef0..741d34f7e 100644
--- a/ceno_emul/src/platform.rs
+++ b/ceno_emul/src/platform.rs
@@ -32,14 +32,10 @@ pub const CENO_PLATFORM: Platform = Platform {
 impl Platform {
     // Virtual memory layout.
 
-    pub fn is_rom(&self, addr: Addr) -> bool {
+    pub fn is_prog_code(&self, addr: Addr) -> bool {
         self.prog_code.contains(&addr)
     }
 
-    pub fn is_ram(&self, addr: Addr) -> bool {
-        self.stack.contains(&addr) || self.heap.contains(&addr) || self.is_prog_data(addr)
-    }
-
     pub fn is_prog_data(&self, addr: Addr) -> bool {
         self.prog_data
             .as_ref()
@@ -47,6 +43,10 @@ impl Platform {
             .unwrap_or(false)
     }
 
+    pub fn is_ram(&self, addr: Addr) -> bool {
+        self.stack.contains(&addr) || self.heap.contains(&addr) || self.is_prog_data(addr)
+    }
+
     pub fn is_pub_io(&self, addr: Addr) -> bool {
         self.public_io.contains(&addr)
     }
@@ -83,7 +83,7 @@ impl Platform {
     }
 
     pub fn can_execute(&self, addr: Addr) -> bool {
-        self.is_rom(addr)
+        self.is_prog_code(addr)
     }
 
     // Environment calls.
@@ -124,8 +124,8 @@ mod tests {
         let p = CENO_PLATFORM;
         assert!(p.can_execute(p.pc_base()));
         // ROM and RAM do not overlap.
-        assert!(!p.is_rom(p.heap.start));
-        assert!(!p.is_rom(p.heap.end - WORD_SIZE as Addr));
+        assert!(!p.is_prog_code(p.heap.start));
+        assert!(!p.is_prog_code(p.heap.end - WORD_SIZE as Addr));
         assert!(!p.is_ram(p.prog_code.start));
         assert!(!p.is_ram(p.prog_code.end - WORD_SIZE as Addr));
         // Registers do not overlap with ROM or RAM.
@@ -133,7 +133,7 @@ mod tests {
             Platform::register_vma(0),
             Platform::register_vma(VMState::REG_COUNT - 1),
         ] {
-            assert!(!p.is_rom(reg));
+            assert!(!p.is_prog_code(reg));
             assert!(!p.is_ram(reg));
         }
     }