From fbbb16d448a92251779eb6b2e255b05e69bb3868 Mon Sep 17 00:00:00 2001
From: David Li <li.davidm96@gmail.com>
Date: Wed, 6 Jan 2016 12:16:13 -0700
Subject: Keep track of bytes written with proxy memory

---
 Cargo.lock  |  4 +--
 Cargo.toml  |  2 +-
 src/main.rs | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 3 files changed, 84 insertions(+), 7 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 5ad6d68..c98941d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,7 +4,7 @@ version = "0.1.0"
 dependencies = [
  "docopt 0.6.78 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustv 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustv 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -65,7 +65,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "rustv"
-version = "0.2.1"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "elfloader32 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index f22ebb2..e9c924a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,6 +4,6 @@ version = "0.1.0"
 authors = ["David Li <li.davidm96@gmail.com>"]
 
 [dependencies]
-rustv = "0.2.1"
+rustv = "0.2.4"
 docopt = "0.6"
 rustc-serialize = "0.3"
diff --git a/src/main.rs b/src/main.rs
index 15b4fba..e91db5f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -12,6 +12,8 @@ use docopt::Docopt;
 use rustv::elfloader;
 use rustv::isa;
 use rustv::memory;
+use rustv::memory::MemoryInterface;
+use rustv::memory::Mmu;
 use rustv::simulator;
 
 const USAGE: &'static str = "
@@ -31,6 +33,69 @@ struct Args {
     arg_program2: String,
 }
 
+struct MemoryTracker {
+    memory: memory::Memory,
+    program1_byte: u8,
+    program2_byte: u8,
+    program1: usize,
+    program2: usize,
+}
+
+impl memory::MemoryInterface for MemoryTracker {
+    fn latency(&self) -> u32 {
+        self.memory.latency()
+    }
+
+    fn step(&mut self) {
+        self.memory.step();
+    }
+
+    fn read_word(&mut self, address: isa::Address) -> memory::Result<isa::Word> {
+        self.memory.read_word(address)
+    }
+
+    fn write_word(&mut self, address: isa::Address, value: isa::Word) -> memory::Result<()> {
+        let original = self.memory.read_word(address);
+        let result = self.memory.write_word(address, value);
+
+        if let Ok(original) = original {
+            if let Ok(()) = result {
+                let p1b = self.program1_byte as u32;
+                let mut p1orig = 0;
+                let mut p1new = 0;
+                if original & 0xFF == p1b { p1orig += 1; }
+                if (original >> 8) & 0xFF == p1b { p1orig += 1; }
+                if (original >> 8) & 0xFF == p1b { p1orig += 1; }
+                if (original >> 8) & 0xFF == p1b { p1orig += 1; }
+
+                if value & 0xFF == p1b { p1new += 1; }
+                if (value >> 8) & 0xFF == p1b { p1new += 1; }
+                if (value >> 8) & 0xFF == p1b { p1new += 1; }
+                if (value >> 8) & 0xFF == p1b { p1new += 1; }
+
+                self.program1 += p1new - p1orig;
+
+                let p2b = self.program2_byte as u32;
+                let mut p2orig = 0;
+                let mut p2new = 0;
+                if original & 0xFF == p2b { p2orig += 1; }
+                if (original >> 8) & 0xFF == p2b { p2orig += 1; }
+                if (original >> 8) & 0xFF == p2b { p2orig += 1; }
+                if (original >> 8) & 0xFF == p2b { p2orig += 1; }
+
+                if value & 0xFF == p2b { p2new += 1; }
+                if (value >> 8) & 0xFF == p2b { p2new += 1; }
+                if (value >> 8) & 0xFF == p2b { p2new += 1; }
+                if (value >> 8) & 0xFF == p2b { p2new += 1; }
+
+                self.program2 += p2new - p2orig;
+            }
+        }
+
+        result
+    }
+}
+
 fn load_program<T: memory::Mmu>(memory: &mut memory::Memory,
                                 mmu: &T, path: &str) -> isa::Address {
     let mut f = File::open(path).unwrap();
@@ -73,11 +138,17 @@ fn main() {
     let start1 = load_program(&mut memory, &mmu, &args.arg_program1);
     let start2 = load_program(&mut memory, &mmu2, &args.arg_program2);
 
-    let memory_box = Box::new(memory) as Box<memory::MemoryInterface>;
-    let memory_ref = Rc::new(RefCell::new(memory_box));
+    let mut memory = MemoryTracker {
+        memory: memory,
+        program1_byte: 0x43,
+        program2_byte: 0x42,
+        program1: 0,
+        program2: 0,
+    };
+
+    let memory_ref = Rc::new(RefCell::new(memory));
     let cache = memory::DirectMappedCache::new(4, 4, memory_ref.clone());
-    let cache_box = Box::new(cache) as Box<memory::MemoryInterface>;
-    let cache_ref = Rc::new(RefCell::new(cache_box));
+    let cache_ref = Rc::new(RefCell::new(cache));
     let core = simulator::Core::new(
         start1, 0x1000,
         cache_ref.clone(), Box::new(mmu));
@@ -86,5 +157,11 @@ fn main() {
         cache_ref.clone(), Box::new(mmu2));
     let cores = vec![core, core2];
     let mut simulator = simulator::Simulator::new(cores, memory_ref.clone());
+
+    println!("{:?}", memory_ref.borrow_mut().read_instruction((start1)));
+
     simulator.run();
+
+    println!("Program 1 bytes written: {}", memory_ref.borrow().program1);
+    println!("Program 2 bytes written: {}", memory_ref.borrow().program2);
 }
-- 
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