fix: Fix boolean oveflow casts for constants (AssemblyScript#2134)

Author: MaxGraey

src/compiler.ts

@@ -3394,6 +3394,14 @@ export class Compiler extends DiagnosticEmitter {
     var type = element.type;
     this.currentType = type;
     switch (type.kind) {
+      case TypeKind.BOOL: {
+        return this.module.i32(
+          element.constantValueKind == ConstantValueKind.INTEGER
+            // @ts-ignore
+            ? <i32>i64_ne(element.constantIntegerValue, i64_zero)
+            : 0
+        );
+      }
       case TypeKind.I8:
       case TypeKind.I16: {
         let shift = type.computeSmallIntegerShift(Type.i32);
@@ -3404,8 +3412,7 @@ export class Compiler extends DiagnosticEmitter {
         ); // recognized by canOverflow
       }
       case TypeKind.U8:
-      case TypeKind.U16:
-      case TypeKind.BOOL: {
+      case TypeKind.U16: {
         let mask = element.type.computeSmallIntegerMask(Type.i32);
         return this.module.i32(
           element.constantValueKind == ConstantValueKind.INTEGER

tests/compiler/overflow.ts

@@ -129,6 +129,27 @@
   assert(val - 1 == 0xffff);
 }
 
+// special cases
+{
+  const b1 = <bool>2;
+  assert(b1 == true);
+
+  const b2 = <bool>-1;
+  assert(b2 == true);
+
+  const b3 = <bool>0;
+  assert(b3 == false);
+
+  let b4 = <bool>2;
+  assert(b4 == true);
+
+  let b5 = <bool>-1;
+  assert(b5 == true);
+
+  let b6 = <bool>0;
+  assert(b6 == false);
+}
+
 {
   // regression #2131
   const a: u32 = 65;

tests/compiler/overflow.untouched.wat

@@ -677,6 +677,64 @@
    call $~lib/builtins/abort
    unreachable
   end
+  i32.const 1
+  i32.const 1
+  i32.eq
+  drop
+  i32.const 1
+  i32.const 1
+  i32.eq
+  drop
+  i32.const 0
+  i32.const 0
+  i32.eq
+  drop
+  i32.const 2
+  local.set $0
+  local.get $0
+  i32.const 0
+  i32.ne
+  i32.const 1
+  i32.eq
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 144
+   i32.const 3
+   call $~lib/builtins/abort
+   unreachable
+  end
+  i32.const -1
+  local.set $1
+  local.get $1
+  i32.const 0
+  i32.ne
+  i32.const 1
+  i32.eq
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 147
+   i32.const 3
+   call $~lib/builtins/abort
+   unreachable
+  end
+  i32.const 0
+  local.set $2
+  local.get $2
+  i32.const 0
+  i32.eq
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 150
+   i32.const 3
+   call $~lib/builtins/abort
+   unreachable
+  end
   i32.const 65
   i32.const 63457
   i32.const 504
@@ -690,15 +748,15 @@
   i32.const 65535
   i32.and
   i32.add
-  local.set $0
-  local.get $0
+  local.set $2
+  local.get $2
   i32.const 65597
   i32.eq
   i32.eqz
   if
    i32.const 0
    i32.const 32
-   i32.const 138
+   i32.const 159
    i32.const 3
    call $~lib/builtins/abort
    unreachable