Add quickcheck, implement simple binary operations

Cargo.toml

@@ -16,6 +16,8 @@ capstone = "0.5.0"
 failure = "0.1.3"
 failure_derive = "0.1.3"
 wabt = "0.7"
+lazy_static = "1.2"
+quickcheck = "0.7"
 
 [badges]
 maintenance = { status = "experimental" }

src/backend.rs

@@ -160,6 +160,7 @@ impl CodeGenSession {
     }
 }
 
+#[derive(Debug)]
 pub struct TranslatedCodeSection {
     exec_buf: ExecutableBuffer,
     func_starts: Vec<AssemblyOffset>,
@@ -170,6 +171,10 @@ impl TranslatedCodeSection {
         let offset = self.func_starts[idx];
         self.exec_buf.ptr(offset)
     }
+
+    pub fn disassemble(&self) {
+        ::disassemble::disassemble(&*self.exec_buf).unwrap();
+    }
 }
 
 pub struct Context<'a> {
@@ -238,14 +243,64 @@ fn pop_i32(ctx: &mut Context) -> GPR {
     gpr
 }
 
-pub fn add_i32(ctx: &mut Context) {
+pub fn i32_add(ctx: &mut Context) {
     let op0 = pop_i32(ctx);
     let op1 = pop_i32(ctx);
     dynasm!(ctx.asm
-        ; add Rd(op0), Rd(op1)
+        ; add Rd(op1), Rd(op0)
     );
-    push_i32(ctx, op0);
-    ctx.regs.release_scratch_gpr(op1);
+    push_i32(ctx, op1);
+    ctx.regs.release_scratch_gpr(op0);
+}
+
+pub fn i32_sub(ctx: &mut Context) {
+    let op0 = pop_i32(ctx);
+    let op1 = pop_i32(ctx);
+    dynasm!(ctx.asm
+        ; sub Rd(op1), Rd(op0)
+    );
+    push_i32(ctx, op1);
+    ctx.regs.release_scratch_gpr(op0);
+}
+
+pub fn i32_and(ctx: &mut Context) {
+    let op0 = pop_i32(ctx);
+    let op1 = pop_i32(ctx);
+    dynasm!(ctx.asm
+        ; and Rd(op1), Rd(op0)
+    );
+    push_i32(ctx, op1);
+    ctx.regs.release_scratch_gpr(op0);
+}
+
+pub fn i32_or(ctx: &mut Context) {
+    let op0 = pop_i32(ctx);
+    let op1 = pop_i32(ctx);
+    dynasm!(ctx.asm
+        ; or Rd(op1), Rd(op0)
+    );
+    push_i32(ctx, op1);
+    ctx.regs.release_scratch_gpr(op0);
+}
+
+pub fn i32_xor(ctx: &mut Context) {
+    let op0 = pop_i32(ctx);
+    let op1 = pop_i32(ctx);
+    dynasm!(ctx.asm
+        ; xor Rd(op1), Rd(op0)
+    );
+    push_i32(ctx, op1);
+    ctx.regs.release_scratch_gpr(op0);
+}
+
+pub fn i32_mul(ctx: &mut Context) {
+    let op0 = pop_i32(ctx);
+    let op1 = pop_i32(ctx);
+    dynasm!(ctx.asm
+        ; imul Rd(op1), Rd(op0)
+    );
+    push_i32(ctx, op1);
+    ctx.regs.release_scratch_gpr(op0);
 }
 
 fn sp_relative_offset(ctx: &mut Context, slot_idx: u32) -> i32 {
@@ -411,6 +466,7 @@ pub fn call_direct(ctx: &mut Context, index: u32, arg_arity: u32, return_arity:
 }
 
 pub fn prologue(ctx: &mut Context, stack_slots: u32) {
+    let stack_slots = stack_slots;
     // Align stack slots to the nearest even number. This is required
     // by x86-64 ABI.
     let aligned_stack_slots = (stack_slots + 1) & !1;

src/function_body.rs

@@ -208,18 +208,15 @@ pub fn translate(
                     }
                 }
             }
-            Operator::I32Eq => {
-                relop_eq_i32(&mut ctx);
-            }
-            Operator::I32Add => {
-                add_i32(&mut ctx);
-            }
-            Operator::GetLocal { local_index } => {
-                get_local_i32(&mut ctx, local_index);
-            }
-            Operator::I32Const { value } => {
-                literal_i32(&mut ctx, value);
-            }
+            Operator::I32Eq => relop_eq_i32(&mut ctx),
+            Operator::I32Add => i32_add(&mut ctx),
+            Operator::I32Sub => i32_sub(&mut ctx),
+            Operator::I32And => i32_and(&mut ctx),
+            Operator::I32Or => i32_or(&mut ctx),
+            Operator::I32Xor => i32_xor(&mut ctx),
+            Operator::I32Mul => i32_mul(&mut ctx),
+            Operator::GetLocal { local_index } => get_local_i32(&mut ctx, local_index),
+            Operator::I32Const { value } => literal_i32(&mut ctx, value),
             Operator::Call { function_index } => {
                 let callee_ty = translation_ctx.func_type(function_index);
 

src/lib.rs

@@ -7,7 +7,10 @@ extern crate wasmparser;
 #[macro_use]
 extern crate failure_derive;
 extern crate dynasmrt;
-
+#[macro_use]
+extern crate lazy_static;
+#[macro_use]
+extern crate quickcheck;
 extern crate wabt;
 
 mod backend;

src/module.rs

@@ -52,6 +52,13 @@ impl TranslatedModule {
 
         args.call(start_buf)
     }
+
+    pub fn disassemble(&self) {
+        self.translated_code_section
+            .as_ref()
+            .expect("no code section")
+            .disassemble();
+    }
 }
 
 #[derive(Default)]

src/tests.rs

@@ -18,20 +18,33 @@ fn empty() {
     let _ = translate_wat("(module (func))");
 }
 
-#[test]
-fn adds() {
-    const CASES: &[(u32, u32, u32)] = &[(5, 3, 8), (0, 228, 228), (u32::max_value(), 1, 0)];
+macro_rules! binop_test {
+    ($op:ident, $func:path) => {
+        quickcheck! {
+            fn $op(a: u32, b: u32) -> bool {
+                static CODE: &str = concat!(
+                    "(module (func (param i32) (param i32) (result i32) (i32.",
+                    stringify!($op),
+                    " (get_local 0) (get_local 1))))"
+                );
 
-    let code = r#"
-(module
-  (func (param i32) (param i32) (result i32) (i32.add (get_local 0) (get_local 1)))
-)
-    "#;
-    for (a, b, expected) in CASES {
-        assert_eq!(execute_wat(code, *a, *b), *expected);
-    }
+                lazy_static! {
+                    static ref TRANSLATED: TranslatedModule = translate_wat(CODE);
+                }
+
+                unsafe { TRANSLATED.execute_func::<(u32, u32), u32>(0, (a, b)) == $func(a, b) }
+            }
+        }
+    };
 }
 
+binop_test!(add, u32::wrapping_add);
+binop_test!(sub, u32::wrapping_sub);
+binop_test!(and, std::ops::BitAnd::bitand);
+binop_test!(or, std::ops::BitOr::bitor);
+binop_test!(xor, std::ops::BitXor::bitxor);
+binop_test!(mul, u32::wrapping_mul);
+
 #[test]
 fn relop_eq() {
     const CASES: &[(u32, u32, u32)] = &[