Fix n-body visualization

Author: dcodeIO

README.md

@@ -70,10 +70,8 @@ Examples
 * **[WASM parser](./lib/parse)**<br />
   A WebAssembly binary parser in WebAssembly.
 
-Benchmarks
----------
-* **[n-body](./examples/n-body)**<br />
-  Compare performance and produced binary size with n-body example from Computer Language Benchmarks Game.
+* **[N-body system](./examples/n-body)** [ [demo](https://rawgit.com/AssemblyScript/assemblyscript/master/examples/n-body/index.html) ]<br />
+  An implementation of the N-body system from the [Computer Language Benchmarks Game](https://benchmarksgame-team.pages.debian.net/benchmarksgame/).
 
 Building
 --------

dist/asc.js

@@ -1,4 +1,4 @@
-N-Body-System
+N-body system
 =============
 
 An [AssemblyScript](http://assemblyscript.org) example. This is actually a benchmark - visualizing it just so happened.

dist/asc.js.map

@@ -203,3 +203,8 @@ export function step(): float {
 export function bench(steps: u32): void {
   for (let i: u32 = 0; i < steps; ++i) system.advance(0.01);
 }
+
+export function getBody(index: i32): Body | null {
+  var bodies = system.bodies;
+  return <u32>index < <u32>bodies.length ? bodies[index] : null;
+}

dist/assemblyscript.js

@@ -477,6 +477,19 @@ function asmFunc(global, env, buffer) {
   };
  }
 
+ function assembly_index_getBody($0) {
+  $0 = $0 | 0;
+  var $1 = 0, $22 = 0, $20 = 0;
+  $1 = HEAPU32[assembly_index_system >> 2] | 0;
+  if ($0 >>> 0 < (HEAP32[($1 + 4 | 0) >> 2] | 0) >>> 0) {
+   $1 = HEAPU32[$1 >> 2] | 0;
+   if ($0 >>> 0 < ((HEAP32[$1 >> 2] | 0) >>> 2 | 0) >>> 0) $20 = HEAPU32[(($1 + ($0 << 2 | 0) | 0) + 8 | 0) >> 2] | 0; else abort();
+   $22 = $20;
+  } else $22 = 0;
+  $0 = $22;
+  return $0 | 0;
+ }
+ 
  function start() {
   $lib_allocator_arena_startOffset = 40;
   $lib_allocator_arena_offset = $lib_allocator_arena_startOffset;
@@ -521,6 +534,7 @@ function asmFunc(global, env, buffer) {
   }), 
   init: assembly_index_init, 
   step: assembly_index_step, 
-  bench: assembly_index_bench
+  bench: assembly_index_bench, 
+  getBody: assembly_index_getBody
  };
 }

dist/assemblyscript.js.map

@@ -19,6 +19,7 @@
  (export "init" (func $assembly/index/init))
  (export "step" (func $assembly/index/step))
  (export "bench" (func $assembly/index/bench))
+ (export "getBody" (func $assembly/index/getBody))
  (start $start)
  (func $~lib/allocator/arena/__memory_allocate (; 1 ;) (type $ii) (param $0 i32) (result i32)
   (local $1 i32)
@@ -1356,7 +1357,50 @@
    )
   )
  )
- (func $start (; 11 ;) (type $v)
+ (func $assembly/index/getBody (; 11 ;) (type $ii) (param $0 i32) (result i32)
+  (local $1 i32)
+  (tee_local $0
+   (if (result i32)
+    (i32.lt_u
+     (get_local $0)
+     (i32.load offset=4
+      (tee_local $1
+       (i32.load
+        (get_global $assembly/index/system)
+       )
+      )
+     )
+    )
+    (if (result i32)
+     (i32.lt_u
+      (get_local $0)
+      (i32.shr_u
+       (i32.load
+        (tee_local $1
+         (i32.load
+          (get_local $1)
+         )
+        )
+       )
+       (i32.const 2)
+      )
+     )
+     (i32.load offset=8
+      (i32.add
+       (get_local $1)
+       (i32.shl
+        (get_local $0)
+        (i32.const 2)
+       )
+      )
+     )
+     (unreachable)
+    )
+    (i32.const 0)
+   )
+  )
+ )
+ (func $start (; 12 ;) (type $v)
   (set_global $~lib/allocator/arena/startOffset
    (i32.const 40)
   )