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// Test the inference of shared memory in asm.js.
//
// These should not be run with --no-asmjs, the guard below checks this.
load(libdir + "asm.js");
if (!this.SharedArrayBuffer || !isAsmJSCompilationAvailable())
quit(0);
setJitCompilerOption('asmjs.atomics.enable', 1);
//////////////////////////////////////////////////////////////////////
//
// Int8Array can be used on SharedArrayBuffer, if atomics are present
var m1 = asmCompile("stdlib", "ffi", "heap", `
"use asm";
var i8 = new stdlib.Int8Array(heap);
var add = stdlib.Atomics.add;
function f() {
add(i8, 0, 1);
return 37;
}
return { f:f }
`);
assertEq(isAsmJSModule(m1), true);
var { f } = m1(this, {}, new SharedArrayBuffer(65536));
assertEq(f(), 37);
//////////////////////////////////////////////////////////////////////
//
// Int8Array cannot be used on SharedArrayBuffer if atomics are not imported.
// One argument for the restriction is that there are some optimizations
// that are legal if the memory is known not to be shared that are illegal
// when it is shared.
var m4 = asmCompile("stdlib", "ffi", "heap", `
"use asm";
var i8 = new stdlib.Int8Array(heap);
function i() {
return i8[0]|0;
}
return { i:i }
`);
assertEq(isAsmJSModule(m4), true);
// An error is not actually thrown because the link failure drops us
// back to JS execution and then the Int8Array constructor will copy data
// from the SharedArrayBuffer.
//
// Running the shell with -w you should see an error here.
var { i } = m4(this, {}, new SharedArrayBuffer(65536));
assertEq(isAsmJSFunction(i), false);
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