Add m-esr52 at 52.6.0

1 files changed, 590 insertions, 0 deletions

diff --git a/js/src/jit-test/tests/wasm/import-export.js b/js/src/jit-test/tests/wasm/import-export.js
new file mode 100644
index 000000000..036a794d2
--- /dev/null
+++ b/js/src/jit-test/tests/wasm/import-export.js
@@ -0,0 +1,590 @@
+load(libdir + 'wasm.js');
+
+const Module = WebAssembly.Module;
+const Instance = WebAssembly.Instance;
+const Memory = WebAssembly.Memory;
+const Table = WebAssembly.Table;
+
+const mem1Page = new Memory({initial:1});
+const mem1PageMax1 = new Memory({initial:1, maximum: 1});
+const mem2Page = new Memory({initial:2});
+const mem2PageMax2 = new Memory({initial:2, maximum: 2});
+const mem2PageMax3 = new Memory({initial:2, maximum: 3});
+const mem2PageMax4 = new Memory({initial:2, maximum: 4});
+const mem3Page = new Memory({initial:3});
+const mem3PageMax3 = new Memory({initial:3, maximum: 3});
+const mem4Page = new Memory({initial:4});
+const mem4PageMax4 = new Memory({initial:4, maximum: 4});
+const tab1Elem = new Table({initial:1, element:"anyfunc"});
+const tab2Elem = new Table({initial:2, element:"anyfunc"});
+const tab3Elem = new Table({initial:3, element:"anyfunc"});
+const tab4Elem = new Table({initial:4, element:"anyfunc"});
+
+assertErrorMessage(() => new Memory({initial:2, maximum:1}), RangeError, /bad Memory maximum size/);
+
+const m1 = new Module(wasmTextToBinary('(module (import "foo" "bar") (import "baz" "quux"))'));
+assertErrorMessage(() => new Instance(m1), TypeError, /second argument must be an object/);
+assertErrorMessage(() => new Instance(m1, {foo:null}), TypeError, /import object field 'foo' is not an Object/);
+assertErrorMessage(() => new Instance(m1, {foo:{bar:{}}}), TypeError, /import object field 'bar' is not a Function/);
+assertErrorMessage(() => new Instance(m1, {foo:{bar:()=>{}}, baz:null}), TypeError, /import object field 'baz' is not an Object/);
+assertErrorMessage(() => new Instance(m1, {foo:{bar:()=>{}}, baz:{}}), TypeError, /import object field 'quux' is not a Function/);
+assertEq(new Instance(m1, {foo:{bar:()=>{}}, baz:{quux:()=>{}}}) instanceof Instance, true);
+
+const m2 = new Module(wasmTextToBinary('(module (import "x" "y" (memory 2 3)))'));
+assertErrorMessage(() => new Instance(m2), TypeError, /second argument must be an object/);
+assertErrorMessage(() => new Instance(m2, {x:null}), TypeError, /import object field 'x' is not an Object/);
+assertErrorMessage(() => new Instance(m2, {x:{y:{}}}), TypeError, /import object field 'y' is not a Memory/);
+assertErrorMessage(() => new Instance(m2, {x:{y:mem1Page}}), TypeError, /imported Memory with incompatible size/);
+assertErrorMessage(() => new Instance(m2, {x:{y:mem1PageMax1}}), TypeError, /imported Memory with incompatible size/);
+assertErrorMessage(() => new Instance(m2, {x:{y:mem4Page}}), TypeError, /imported Memory with incompatible size/);
+assertErrorMessage(() => new Instance(m2, {x:{y:mem4PageMax4}}), TypeError, /imported Memory with incompatible size/);
+assertErrorMessage(() => new Instance(m2, {x:{y:mem2Page}}), TypeError, /imported Memory with incompatible maximum size/);
+assertEq(new Instance(m2, {x:{y:mem2PageMax2}}) instanceof Instance, true);
+assertErrorMessage(() => new Instance(m2, {x:{y:mem3Page}}), TypeError, /imported Memory with incompatible maximum size/);
+assertEq(new Instance(m2, {x:{y:mem3PageMax3}}) instanceof Instance, true);
+assertEq(new Instance(m2, {x:{y:mem2PageMax3}}) instanceof Instance, true);
+assertErrorMessage(() => new Instance(m2, {x:{y:mem2PageMax4}}), TypeError, /imported Memory with incompatible maximum size/);
+
+const m3 = new Module(wasmTextToBinary('(module (import "foo" "bar" (memory 1 1)) (import "baz" "quux"))'));
+assertErrorMessage(() => new Instance(m3), TypeError, /second argument must be an object/);
+assertErrorMessage(() => new Instance(m3, {foo:null}), TypeError, /import object field 'foo' is not an Object/);
+assertErrorMessage(() => new Instance(m3, {foo:{bar:{}}}), TypeError, /import object field 'bar' is not a Memory/);
+assertErrorMessage(() => new Instance(m3, {foo:{bar:mem1Page}, baz:null}), TypeError, /import object field 'baz' is not an Object/);
+assertErrorMessage(() => new Instance(m3, {foo:{bar:mem1Page}, baz:{quux:mem1Page}}), TypeError, /import object field 'quux' is not a Function/);
+assertErrorMessage(() => new Instance(m3, {foo:{bar:mem1Page}, baz:{quux:()=>{}}}), TypeError, /imported Memory with incompatible maximum size/);
+assertEq(new Instance(m3, {foo:{bar:mem1PageMax1}, baz:{quux:()=>{}}}) instanceof Instance, true);
+
+const m4 = new Module(wasmTextToBinary('(module (import "baz" "quux") (import "foo" "bar" (memory 1 1)))'));
+assertErrorMessage(() => new Instance(m4), TypeError, /second argument must be an object/);
+assertErrorMessage(() => new Instance(m4, {baz:null}), TypeError, /import object field 'baz' is not an Object/);
+assertErrorMessage(() => new Instance(m4, {baz:{quux:{}}}), TypeError, /import object field 'quux' is not a Function/);
+assertErrorMessage(() => new Instance(m4, {baz:{quux:()=>{}}, foo:null}), TypeError, /import object field 'foo' is not an Object/);
+assertErrorMessage(() => new Instance(m4, {baz:{quux:()=>{}}, foo:{bar:()=>{}}}), TypeError, /import object field 'bar' is not a Memory/);
+assertErrorMessage(() => new Instance(m4, {baz:{quux:()=>{}}, foo:{bar:mem1Page}}), TypeError, /imported Memory with incompatible maximum size/);
+assertEq(new Instance(m3, {baz:{quux:()=>{}}, foo:{bar:mem1PageMax1}}) instanceof Instance, true);
+
+const m5 = new Module(wasmTextToBinary('(module (import "a" "b" (memory 2)))'));
+assertErrorMessage(() => new Instance(m5, {a:{b:mem1Page}}), TypeError, /imported Memory with incompatible size/);
+assertEq(new Instance(m5, {a:{b:mem2Page}}) instanceof Instance, true);
+assertEq(new Instance(m5, {a:{b:mem3Page}}) instanceof Instance, true);
+assertEq(new Instance(m5, {a:{b:mem4Page}}) instanceof Instance, true);
+
+const m6 = new Module(wasmTextToBinary('(module (import "a" "b" (table 2 anyfunc)))'));
+assertErrorMessage(() => new Instance(m6, {a:{b:tab1Elem}}), TypeError, /imported Table with incompatible size/);
+assertEq(new Instance(m6, {a:{b:tab2Elem}}) instanceof Instance, true);
+assertEq(new Instance(m6, {a:{b:tab3Elem}}) instanceof Instance, true);
+assertEq(new Instance(m6, {a:{b:tab4Elem}}) instanceof Instance, true);
+
+const m7 = new Module(wasmTextToBinary('(module (import "a" "b" (table 2 3 anyfunc)))'));
+assertErrorMessage(() => new Instance(m7, {a:{b:tab1Elem}}), TypeError, /imported Table with incompatible size/);
+assertErrorMessage(() => new Instance(m7, {a:{b:tab2Elem}}), TypeError, /imported Table with incompatible maximum size/);
+assertErrorMessage(() => new Instance(m7, {a:{b:tab3Elem}}), TypeError, /imported Table with incompatible maximum size/);
+assertErrorMessage(() => new Instance(m7, {a:{b:tab4Elem}}), TypeError, /imported Table with incompatible size/);
+
+wasmFailValidateText('(module (memory 2 1))', /maximum length 1 is less than initial length 2/);
+wasmFailValidateText('(module (import "a" "b" (memory 2 1)))', /maximum length 1 is less than initial length 2/);
+wasmFailValidateText('(module (table 2 1 anyfunc))', /maximum length 1 is less than initial length 2/);
+wasmFailValidateText('(module (import "a" "b" (table 2 1 anyfunc)))', /maximum length 1 is less than initial length 2/);
+
+// Import wasm-wasm type mismatch
+
+var e = wasmEvalText('(module (func $i2v (param i32)) (export "i2v" $i2v) (func $f2v (param f32)) (export "f2v" $f2v))').exports;
+var i2vm = new Module(wasmTextToBinary('(module (import "a" "b" (param i32)))'));
+var f2vm = new Module(wasmTextToBinary('(module (import "a" "b" (param f32)))'));
+assertEq(new Instance(i2vm, {a:{b:e.i2v}}) instanceof Instance, true);
+assertErrorMessage(() => new Instance(i2vm, {a:{b:e.f2v}}), TypeError, /imported function signature mismatch/);
+assertErrorMessage(() => new Instance(f2vm, {a:{b:e.i2v}}), TypeError, /imported function signature mismatch/);
+assertEq(new Instance(f2vm, {a:{b:e.f2v}}) instanceof Instance, true);
+
+// Import order:
+
+var arr = [];
+var importObj = {
+    get foo() { arr.push("foo") },
+    get baz() { arr.push("bad") },
+};
+assertErrorMessage(() => new Instance(m1, importObj), TypeError, /import object field 'foo' is not an Object/);
+assertEq(arr.join(), "foo");
+
+var arr = [];
+var importObj = {
+    get foo() {
+        arr.push("foo");
+        return { get bar() { arr.push("bar"); return null } }
+    },
+    get baz() { arr.push("bad") },
+};
+assertErrorMessage(() => new Instance(m1, importObj), TypeError, /import object field 'bar' is not a Function/);
+assertEq(arr.join(), "foo,bar");
+
+var arr = [];
+var importObj = {
+    get foo() {
+        arr.push("foo");
+        return { get bar() { arr.push("bar"); return () => arr.push("bad") } }
+    },
+    get baz() {
+        arr.push("baz");
+        return { get quux() { arr.push("quux"); return () => arr.push("bad") } }
+    }
+};
+assertEq(new Instance(m1, importObj) instanceof Instance, true);
+assertEq(arr.join(), "foo,bar,baz,quux");
+
+var arr = [];
+var importObj = {
+    get foo() {
+        arr.push("foo");
+        return { get bar() { arr.push("bar"); return new WebAssembly.Memory({initial:1, maximum:1}) } }
+    },
+    get baz() {
+        arr.push("baz");
+        return { get quux() { arr.push("quux"); return () => arr.push("bad") } }
+    }
+};
+assertEq(new Instance(m3, importObj) instanceof Instance, true);
+assertEq(arr.join(), "foo,bar,baz,quux");
+arr = [];
+assertEq(new Instance(m4, importObj) instanceof Instance, true);
+assertEq(arr.join(), "baz,quux,foo,bar");
+
+// Export key order:
+
+var code = wasmTextToBinary('(module)');
+var e = new Instance(new Module(code)).exports;
+assertEq(Object.keys(e).length, 0);
+
+var code = wasmTextToBinary('(module (func) (export "foo" 0))');
+var e = new Instance(new Module(code)).exports;
+assertEq(Object.keys(e).join(), "foo");
+assertEq(e.foo(), undefined);
+
+var code = wasmTextToBinary('(module (func) (export "foo" 0) (export "bar" 0))');
+var e = new Instance(new Module(code)).exports;
+assertEq(Object.keys(e).join(), "foo,bar");
+assertEq(e.foo(), undefined);
+assertEq(e.bar(), undefined);
+assertEq(e.foo, e.bar);
+
+var code = wasmTextToBinary('(module (memory 1 1) (export "memory" memory))');
+var e = new Instance(new Module(code)).exports;
+assertEq(Object.keys(e).join(), "memory");
+
+var code = wasmTextToBinary('(module (memory 1 1) (export "foo" memory) (export "bar" memory))');
+var e = new Instance(new Module(code)).exports;
+assertEq(Object.keys(e).join(), "foo,bar");
+assertEq(e.foo, e.bar);
+assertEq(e.foo instanceof Memory, true);
+assertEq(e.foo.buffer.byteLength, 64*1024);
+
+var code = wasmTextToBinary('(module (memory 1 1) (func) (export "foo" 0) (export "bar" memory))');
+var e = new Instance(new Module(code)).exports;
+assertEq(Object.keys(e).join(), "foo,bar");
+assertEq(e.foo(), undefined);
+assertEq(e.bar instanceof Memory, true);
+assertEq(e.bar instanceof Memory, true);
+assertEq(e.bar.buffer.byteLength, 64*1024);
+
+var code = wasmTextToBinary('(module (memory 1 1) (func) (export "bar" memory) (export "foo" 0))');
+var e = new Instance(new Module(code)).exports;
+assertEq(Object.keys(e).join(), "bar,foo");
+assertEq(e.foo(), undefined);
+assertEq(e.bar.buffer.byteLength, 64*1024);
+
+var code = wasmTextToBinary('(module (memory 1 1) (export "" memory))');
+var e = new Instance(new Module(code)).exports;
+assertEq(Object.keys(e).length, 1);
+assertEq(String(Object.keys(e)), "");
+assertEq(e[""] instanceof Memory, true);
+
+var code = wasmTextToBinary('(module (table 0 anyfunc) (export "tbl" table))');
+var e = new Instance(new Module(code)).exports;
+assertEq(Object.keys(e).join(), "tbl");
+assertEq(e.tbl instanceof Table, true);
+assertEq(e.tbl.length, 0);
+
+var code = wasmTextToBinary('(module (table 2 anyfunc) (export "t1" table) (export "t2" table))');
+var e = new Instance(new Module(code)).exports;
+assertEq(Object.keys(e).join(), "t1,t2");
+assertEq(e.t1 instanceof Table, true);
+assertEq(e.t2 instanceof Table, true);
+assertEq(e.t1, e.t2);
+assertEq(e.t1.length, 2);
+
+var code = wasmTextToBinary('(module (table 2 anyfunc) (memory 1 1) (func) (export "t" table) (export "m" memory) (export "f" 0))');
+var e = new Instance(new Module(code)).exports;
+assertEq(Object.keys(e).join(), "t,m,f");
+assertEq(e.f(), undefined);
+assertEq(e.t instanceof Table, true);
+assertEq(e.m instanceof Memory, true);
+assertEq(e.t.length, 2);
+
+var code = wasmTextToBinary('(module (table 1 anyfunc) (memory 1 1) (func) (export "m" memory) (export "f" 0) (export "t" table))');
+var e = new Instance(new Module(code)).exports;
+assertEq(Object.keys(e).join(), "m,f,t");
+assertEq(e.f(), undefined);
+assertEq(e.t instanceof Table, true);
+assertEq(e.m instanceof Memory, true);
++assertEq(e.t.length, 1);
+
+var code = wasmTextToBinary('(module (table 0 anyfunc) (export "" table))');
+var e = new Instance(new Module(code)).exports;
+assertEq(Object.keys(e).length, 1);
+assertEq(String(Object.keys(e)), "");
+assertEq(e[""] instanceof Table, true);
++assertEq(e[""].length, 0);
+
+// Table export function identity
+
+var text = `(module
+    (func $f (result i32) (i32.const 1))
+    (func $g (result i32) (i32.const 2))
+    (func $h (result i32) (i32.const 3))
+    (table 4 anyfunc)
+    (elem (i32.const 0) $f)
+    (elem (i32.const 2) $g)
+    (export "f1" $f)
+    (export "tbl1" table)
+    (export "f2" $f)
+    (export "tbl2" table)
+    (export "f3" $h)
+    (func (export "run") (result i32) (call_indirect 0 (i32.const 2)))
+)`;
+wasmFullPass(text, 2);
+var e = new Instance(new Module(wasmTextToBinary(text))).exports;
+assertEq(String(Object.keys(e)), "f1,tbl1,f2,tbl2,f3,run");
+assertEq(e.f1, e.f2);
+assertEq(e.f1(), 1);
+assertEq(e.f3(), 3);
+assertEq(e.tbl1, e.tbl2);
+assertEq(e.tbl1.get(0), e.f1);
+assertEq(e.tbl1.get(0), e.tbl1.get(0));
+assertEq(e.tbl1.get(0)(), 1);
+assertEq(e.tbl1.get(1), null);
+assertEq(e.tbl1.get(2), e.tbl1.get(2));
+assertEq(e.tbl1.get(2)(), 2);
+assertEq(e.tbl1.get(3), null);
+assertErrorMessage(() => e.tbl1.get(4), RangeError, /bad Table get index/);
+assertEq(e.tbl1.get(1), null);
+e.tbl1.set(1, e.f3);
+assertEq(e.tbl1.get(1), e.f3);
+e.tbl1.set(1, null);
+assertEq(e.tbl1.get(1), null);
+e.tbl1.set(3, e.f1);
+assertEq(e.tbl1.get(0), e.tbl1.get(3));
+
+// JS re-exports
+
+var args;
+var m = new Module(wasmTextToBinary(`(module
+    (export "a" $a) (import $a "" "a" (param f32))
+    (export "b" $b) (import $b "" "b" (param i32) (result i32))
+    (export "c" $c) (import $c "" "c" (result i32))
+    (export "d" $d) (import $d "" "d")
+)`));
+var js = function() { args = arguments; return 42 }
+var e = new Instance(m, {"":{a:js, b:js, c:js, d:js}}).exports;
+assertEq(e.a.length, 1);
+assertEq(e.a(), undefined);
+assertEq(args.length, 1);
+assertEq(args[0], NaN);
+assertEq(e.a(99.5), undefined);
+assertEq(args.length, 1);
+assertEq(args[0], 99.5);
+assertEq(e.b.length, 1);
+assertEq(e.b(), 42);
+assertEq(args.length, 1);
+assertEq(args[0], 0);
+assertEq(e.b(99.5), 42);
+assertEq(args.length, 1);
+assertEq(args[0], 99);
+assertEq(e.c.length, 0);
+assertEq(e.c(), 42);
+assertEq(args.length, 0);
+assertEq(e.c(99), 42);
+assertEq(args.length, 0);
+assertEq(e.d.length, 0);
+assertEq(e.d(), undefined);
+assertEq(args.length, 0);
+assertEq(e.d(99), undefined);
+assertEq(args.length, 0);
+
+// Re-exports and Identity:
+
+var code = wasmTextToBinary('(module (import "a" "b" (memory 1 1)) (export "foo" memory) (export "bar" memory))');
+var mem = new Memory({initial:1, maximum:1});
+var e = new Instance(new Module(code), {a:{b:mem}}).exports;
+assertEq(mem, e.foo);
+assertEq(mem, e.bar);
+
+var code = wasmTextToBinary('(module (import "a" "b" (table 1 1 anyfunc)) (export "foo" table) (export "bar" table))');
+var tbl = new Table({initial:1, maximum:1, element:"anyfunc"});
+var e = new Instance(new Module(code), {a:{b:tbl}}).exports;
+assertEq(tbl, e.foo);
+assertEq(tbl, e.bar);
+
+var code = wasmTextToBinary('(module (import "a" "b" (table 2 2 anyfunc)) (func $foo) (elem (i32.const 0) $foo) (export "foo" $foo))');
+var tbl = new Table({initial:2, maximum:2, element:"anyfunc"});
+var e1 = new Instance(new Module(code), {a:{b:tbl}}).exports;
+assertEq(e1.foo, tbl.get(0));
+tbl.set(1, e1.foo);
+assertEq(e1.foo, tbl.get(1));
+var e2 = new Instance(new Module(code), {a:{b:tbl}}).exports;
+assertEq(e2.foo, tbl.get(0));
+assertEq(e1.foo, tbl.get(1));
+assertEq(tbl.get(0) === e1.foo, false);
+assertEq(e1.foo === e2.foo, false);
+
+var m = new Module(wasmTextToBinary(`(module
+    (table 3 anyfunc)
+    (import $foo "" "foo" (result i32))
+    (import $bar "" "bar" (result i32))
+    (func $baz (result i32) (i32.const 13))
+    (elem (i32.const 0) $foo $bar $baz)
+    (export "foo" $foo)
+    (export "bar" $bar)
+    (export "baz" $baz)
+    (export "tbl" table)
+)`));
+var jsFun = () => 83;
+var wasmFun = new Instance(new Module(wasmTextToBinary('(module (func (result i32) (i32.const 42)) (export "foo" 0))'))).exports.foo;
+var e1 = new Instance(m, {"":{foo:jsFun, bar:wasmFun}}).exports;
+assertEq(jsFun === e1.foo, false);
+assertEq(wasmFun, e1.bar);
+assertEq(e1.foo, e1.tbl.get(0));
+assertEq(e1.bar, e1.tbl.get(1));
+assertEq(e1.baz, e1.tbl.get(2));
+assertEq(e1.tbl.get(0)(), 83);
+assertEq(e1.tbl.get(1)(), 42);
+assertEq(e1.tbl.get(2)(), 13);
+var e2 = new Instance(m, {"":{foo:jsFun, bar:jsFun}}).exports;
+assertEq(jsFun === e2.foo, false);
+assertEq(jsFun === e2.bar, false);
+assertEq(e2.foo === e1.foo, false);
+assertEq(e2.bar === e1.bar, false);
+assertEq(e2.baz === e1.baz, false);
+assertEq(e2.tbl === e1.tbl, false);
+assertEq(e2.foo, e2.tbl.get(0));
+assertEq(e2.bar, e2.tbl.get(1));
+assertEq(e2.baz, e2.tbl.get(2));
+var e3 = new Instance(m, {"":{foo:wasmFun, bar:wasmFun}}).exports;
+assertEq(wasmFun, e3.foo);
+assertEq(wasmFun, e3.bar);
+assertEq(e3.baz === e3.foo, false);
+assertEq(e3.baz === e1.baz, false);
+assertEq(e3.tbl === e1.tbl, false);
+assertEq(e3.foo, e3.tbl.get(0));
+assertEq(e3.bar, e3.tbl.get(1));
+assertEq(e3.baz, e3.tbl.get(2));
+var e4 = new Instance(m, {"":{foo:e1.foo, bar:e1.foo}}).exports;
+assertEq(e4.foo, e1.foo);
+assertEq(e4.bar, e1.foo);
+assertEq(e4.baz === e4.foo, false);
+assertEq(e4.baz === e1.baz, false);
+assertEq(e4.tbl === e1.tbl, false);
+assertEq(e4.foo, e4.tbl.get(0));
+assertEq(e4.foo, e4.tbl.get(1));
+assertEq(e4.baz, e4.tbl.get(2));
+
+// i64 is fully allowed for imported wasm functions
+
+var code1 = wasmTextToBinary('(module (func $exp (param i64) (result i64) (i64.add (get_local 0) (i64.const 10))) (export "exp" $exp))');
+var e1 = new Instance(new Module(code1)).exports;
+var code2 = wasmTextToBinary('(module (import $i "a" "b" (param i64) (result i64)) (func $f (result i32) (i32.wrap/i64 (call $i (i64.const 42)))) (export "f" $f))');
+var e2 = new Instance(new Module(code2), {a:{b:e1.exp}}).exports;
+assertEq(e2.f(), 52);
+
+// Non-existent export errors
+
+wasmFailValidateText('(module (export "a" 0))', /exported function index out of bounds/);
+wasmFailValidateText('(module (export "a" global 0))', /exported global index out of bounds/);
+wasmFailValidateText('(module (export "a" memory))', /exported memory index out of bounds/);
+wasmFailValidateText('(module (export "a" table))', /exported table index out of bounds/);
+
+// Default memory/table rules
+
+wasmFailValidateText('(module (import "a" "b" (memory 1 1)) (memory 1 1))', /already have default memory/);
+wasmFailValidateText('(module (import "a" "b" (memory 1 1)) (import "x" "y" (memory 2 2)))', /already have default memory/);
+wasmFailValidateText('(module (import "a" "b" (table 1 1 anyfunc)) (table 1 1 anyfunc))', /already have default table/);
+wasmFailValidateText('(module (import "a" "b" (table 1 1 anyfunc)) (import "x" "y" (table 2 2 anyfunc)))', /already have default table/);
+
+// Data segments on imports
+
+var m = new Module(wasmTextToBinary(`
+    (module
+        (import "a" "b" (memory 1 1))
+        (data (i32.const 0) "\\0a\\0b")
+        (data (i32.const 100) "\\0c\\0d")
+        (func $get (param $p i32) (result i32)
+            (i32.load8_u (get_local $p)))
+        (export "get" $get))
+`));
+var mem = new Memory({initial:1, maximum:1});
+var {get} = new Instance(m, {a:{b:mem}}).exports;
+assertEq(get(0), 0xa);
+assertEq(get(1), 0xb);
+assertEq(get(2), 0x0);
+assertEq(get(100), 0xc);
+assertEq(get(101), 0xd);
+assertEq(get(102), 0x0);
+var i8 = new Uint8Array(mem.buffer);
+assertEq(i8[0], 0xa);
+assertEq(i8[1], 0xb);
+assertEq(i8[2], 0x0);
+assertEq(i8[100], 0xc);
+assertEq(i8[101], 0xd);
+assertEq(i8[102], 0x0);
+
+// Data segments with imported offsets
+
+var m = new Module(wasmTextToBinary(`
+    (module
+        (import "glob" "a" (global i32))
+        (memory 1)
+        (data (get_global 0) "\\0a\\0b"))
+`));
+assertEq(new Instance(m, {glob:{a:0}}) instanceof Instance, true);
+assertEq(new Instance(m, {glob:{a:(64*1024 - 2)}}) instanceof Instance, true);
+assertErrorMessage(() => new Instance(m, {glob:{a:(64*1024 - 1)}}), RangeError, /data segment does not fit/);
+assertErrorMessage(() => new Instance(m, {glob:{a:64*1024}}), RangeError, /data segment does not fit/);
+
+var m = new Module(wasmTextToBinary(`
+    (module
+        (memory 1)
+        (data (i32.const 0x10001) "\\0a\\0b"))
+`));
+assertErrorMessage(() => new Instance(m), RangeError, /data segment does not fit/);
+
+var m = new Module(wasmTextToBinary(`
+    (module
+        (memory 0)
+        (data (i32.const 0x10001) ""))
+`));
+assertEq(new Instance(m) instanceof Instance, true);
+
+// Errors during segment initialization do not have observable effects
+// and are checked against the actual memory/table length, not the declared
+// initial length.
+
+var m = new Module(wasmTextToBinary(`
+    (module
+        (import "a" "mem" (memory 1))
+        (import "a" "tbl" (table 1 anyfunc))
+        (import $memOff "a" "memOff" (global i32))
+        (import $tblOff "a" "tblOff" (global i32))
+        (func $f)
+        (func $g)
+        (data (i32.const 0) "\\01")
+        (elem (i32.const 0) $f)
+        (data (get_global $memOff) "\\02")
+        (elem (get_global $tblOff) $g)
+        (export "f" $f)
+        (export "g" $g))
+`));
+
+var npages = 2;
+var mem = new Memory({initial:npages});
+var mem8 = new Uint8Array(mem.buffer);
+var tbl = new Table({initial:2, element:"anyfunc"});
+
+assertErrorMessage(() => new Instance(m, {a:{mem, tbl, memOff:1, tblOff:2}}), RangeError, /elem segment does not fit/);
+assertEq(mem8[0], 0);
+assertEq(mem8[1], 0);
+assertEq(tbl.get(0), null);
+
+assertErrorMessage(() => new Instance(m, {a:{mem, tbl, memOff:npages*64*1024, tblOff:1}}), RangeError, /data segment does not fit/);
+assertEq(mem8[0], 0);
+assertEq(tbl.get(0), null);
+assertEq(tbl.get(1), null);
+
+var i = new Instance(m, {a:{mem, tbl, memOff:npages*64*1024-1, tblOff:1}});
+assertEq(mem8[0], 1);
+assertEq(mem8[npages*64*1024-1], 2);
+assertEq(tbl.get(0), i.exports.f);
+assertEq(tbl.get(1), i.exports.g);
+
+// Elem segments on imported tables
+
+var m = new Module(wasmTextToBinary(`
+    (module
+        (import "a" "b" (table 10 anyfunc))
+        (elem (i32.const 0) $one $two)
+        (elem (i32.const 3) $three $four)
+        (func $one (result i32) (i32.const 1))
+        (func $two (result i32) (i32.const 2))
+        (func $three (result i32) (i32.const 3))
+        (func $four (result i32) (i32.const 4)))
+`));
+var tbl = new Table({initial:10, element:"anyfunc"});
+new Instance(m, {a:{b:tbl}});
+assertEq(tbl.get(0)(), 1);
+assertEq(tbl.get(1)(), 2);
+assertEq(tbl.get(2), null);
+assertEq(tbl.get(3)(), 3);
+assertEq(tbl.get(4)(), 4);
+for (var i = 5; i < 10; i++)
+    assertEq(tbl.get(i), null);
+
+var m = new Module(wasmTextToBinary(`
+    (module
+        (func $their1 (import "" "func") (result i32))
+        (func $their2 (import "" "func"))
+        (table (import "" "table") 4 anyfunc)
+        (func $my (result i32) i32.const 13)
+        (elem (i32.const 1) $my)
+        (elem (i32.const 2) $their1)
+        (elem (i32.const 3) $their2)
+    )
+`));
+var tbl = new Table({initial:4, element:"anyfunc"});
+var f = () => 42;
+new Instance(m, { "": { table: tbl, func: f} });
+assertEq(tbl.get(0), null);
+assertEq(tbl.get(1)(), 13);
+assertEq(tbl.get(2)(), 42);
+assertEq(tbl.get(3)(), undefined);
+
+// Cross-instance calls
+
+var i1 = new Instance(new Module(wasmTextToBinary(`(module (func) (func (param i32) (result i32) (i32.add (get_local 0) (i32.const 1))) (func) (export "f" 1))`)));
+var i2 = new Instance(new Module(wasmTextToBinary(`(module (import $imp "a" "b" (param i32) (result i32)) (func $g (result i32) (call $imp (i32.const 13))) (export "g" $g))`)), {a:{b:i1.exports.f}});
+assertEq(i2.exports.g(), 14);
+
+var i1 = new Instance(new Module(wasmTextToBinary(`(module
+    (memory 1 1)
+    (data (i32.const 0) "\\42")
+    (func $f (result i32) (i32.load (i32.const 0)))
+    (export "f" $f)
+)`)));
+var i2 = new Instance(new Module(wasmTextToBinary(`(module
+    (import $imp "a" "b" (result i32))
+    (memory 1 1)
+    (data (i32.const 0) "\\13")
+    (table 2 2 anyfunc)
+    (elem (i32.const 0) $imp $def)
+    (func $def (result i32) (i32.load (i32.const 0)))
+    (type $v2i (func (result i32)))
+    (func $call (param i32) (result i32) (call_indirect $v2i (get_local 0)))
+    (export "call" $call)
+)`)), {a:{b:i1.exports.f}});
+assertEq(i2.exports.call(0), 0x42);
+assertEq(i2.exports.call(1), 0x13);
+
+var m = new Module(wasmTextToBinary(`(module
+    (import $val "a" "val" (global i32))
+    (import $next "a" "next" (result i32))
+    (memory 1)
+    (func $start (i32.store (i32.const 0) (get_global $val)))
+    (start $start)
+    (func $call (result i32)
+        (i32.add
+            (get_global $val)
+            (i32.add
+                (i32.load (i32.const 0))
+                (call $next))))
+    (export "call" $call)
+)`));
+var e = {call:() => 1000};
+for (var i = 0; i < 10; i++)
+    e = new Instance(m, {a:{val:i, next:e.call}}).exports;
+assertEq(e.call(), 1090);