[wasm2js] Support exports of Globals (#4523)

Export an object with a `.value` property like the wasm JS API does
in browsers, and implement them with a getter and setter.

Fixes #4522

3 files changed, 80 insertions, 0 deletions

diff --git a/test/wasm2js/export_global.2asm.js b/test/wasm2js/export_global.2asm.js
new file mode 100644
index 000000000..7db0d3a20
--- /dev/null
+++ b/test/wasm2js/export_global.2asm.js
@@ -0,0 +1,37 @@
+
+function asmFunc(env) {
+ var Math_imul = Math.imul;
+ var Math_fround = Math.fround;
+ var Math_abs = Math.abs;
+ var Math_clz32 = Math.clz32;
+ var Math_min = Math.min;
+ var Math_max = Math.max;
+ var Math_floor = Math.floor;
+ var Math_ceil = Math.ceil;
+ var Math_trunc = Math.trunc;
+ var Math_sqrt = Math.sqrt;
+ var abort = env.abort;
+ var nan = NaN;
+ var infinity = Infinity;
+ var global0 = 655360;
+ function $0() {
+  return 42 | 0;
+ }
+ 
+ return {
+  "HELLO": {
+   get value() {
+    return global0;
+   }, 
+   set value(_global0) {
+    global0 = _global0;
+   }
+  }, 
+  "helloWorld": $0
+ };
+}
+
+var retasmFunc = asmFunc(  { abort: function() { throw new Error('abort'); }
+  });
+export var HELLO = retasmFunc.HELLO;
+export var helloWorld = retasmFunc.helloWorld;
diff --git a/test/wasm2js/export_global.2asm.js.opt b/test/wasm2js/export_global.2asm.js.opt
new file mode 100644
index 000000000..eb4e88090
--- /dev/null
+++ b/test/wasm2js/export_global.2asm.js.opt
@@ -0,0 +1,37 @@
+
+function asmFunc(env) {
+ var Math_imul = Math.imul;
+ var Math_fround = Math.fround;
+ var Math_abs = Math.abs;
+ var Math_clz32 = Math.clz32;
+ var Math_min = Math.min;
+ var Math_max = Math.max;
+ var Math_floor = Math.floor;
+ var Math_ceil = Math.ceil;
+ var Math_trunc = Math.trunc;
+ var Math_sqrt = Math.sqrt;
+ var abort = env.abort;
+ var nan = NaN;
+ var infinity = Infinity;
+ var global0 = 655360;
+ function $0() {
+  return 42;
+ }
+ 
+ return {
+  "HELLO": {
+   get value() {
+    return global0;
+   }, 
+   set value(_global0) {
+    global0 = _global0;
+   }
+  }, 
+  "helloWorld": $0
+ };
+}
+
+var retasmFunc = asmFunc(  { abort: function() { throw new Error('abort'); }
+  });
+export var HELLO = retasmFunc.HELLO;
+export var helloWorld = retasmFunc.helloWorld;
diff --git a/test/wasm2js/export_global.wast b/test/wasm2js/export_global.wast
new file mode 100644
index 000000000..9b990be8d
--- /dev/null
+++ b/test/wasm2js/export_global.wast
@@ -0,0 +1,6 @@
+(module
+    (global $global0 i32 (i32.const 655360))
+    (export "HELLO" (global $global0))
+    (func (result i32) (i32.const 42))
+    (export "helloWorld" (func 0))
+)
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