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// |jit-test| skip-if: !hasDisassembler() || !(wasmCompileMode() == "baseline" || wasmCompileMode() == "ion") || !(getBuildConfiguration("x64") && !getBuildConfiguration("arm64-simulator") && !getBuildConfiguration("mips64-simulator"))
// We widen i32 results after calls on 64-bit platforms for two reasons:
//
// - it's a cheap mitigation for certain spectre problems, and
// - it makes the high bits of the 64-bit register conform to platform
// conventions, which they might not if the call was to C++ code
// especially.
//
// This is a whitebox test that explicit widening instructions are inserted
// after calls on x64. The widening is platform-specific; on x64, the upper
// bits are zeroed.
// What we can't test here is the direct-call-from-JIT path, as the generated
// code is not available to wasmDis.
var ins = wasmEvalText(`
(module
(import "" "wasm2import" (func $g (result i32)))
(memory 1)
(type $ty (func (result i32)))
(table $t 1 1 funcref)
(func $f (result i32)
(i32.const 37))
(func (export "wasm2wasm") (result i32)
(call $f))
(func (export "wasm2import") (result i32)
(call $g))
(func (export "wasmIndirect") (result i32)
(call_indirect $t (type $ty) (i32.const 0)))
(func (export "instanceCall") (result i32)
(memory.size))
)`, {'':{'wasm2import': function() {}}});
switch (wasmCompileMode()) {
case "ion":
assertEq(wasmDis(ins.exports.wasm2wasm, {tier:'stable', asString:true}).match(/call.*\n(?:.*lea.*%rsp\n)?.*mov %eax, %eax/).length, 1);
assertEq(wasmDis(ins.exports.wasm2import, {tier:'stable', asString:true}).match(/call.*\n(?:.*or \$0x00, %r14\n)?(?:.*movq.*\n)*(?:.*lea.*%rsp\n)?.*mov %eax, %eax/).length, 1);
assertEq(wasmDis(ins.exports.wasmIndirect, {tier:'stable', asString:true}).match(/call.*\n(?:.*movq.*\n)*(?:.*lea.*%rsp\n)?.*mov %eax, %eax/).length, 1);
assertEq(wasmDis(ins.exports.instanceCall, {tier:'stable', asString:true}).match(/call.*\n(?:.*movq.*\n)*.*mov %eax, %eax/).length, 1);
break;
case "baseline":
assertEq(wasmDis(ins.exports.wasm2wasm, {tier:'stable', asString:true}).match(/call.*\n.*lea.*%rsp\n.*mov %eax, %eax/).length, 1);
assertEq(wasmDis(ins.exports.wasm2import, {tier:'stable', asString:true}).match(/call.*\n(?:.*or \$0x00, %r14\n)?.*lea.*%rsp\n(?:.*movq.*\n)*.*mov %eax, %eax/).length, 1);
assertEq(wasmDis(ins.exports.wasmIndirect, {tier:'stable', asString:true}).match(/call.*\n.*lea.*%rsp\n(?:.*movq.*\n)*.*mov %eax, %eax/).length, 1);
assertEq(wasmDis(ins.exports.instanceCall, {tier:'stable', asString:true}).match(/call.*\n.*lea.*%rsp\n(?:.*movq.*\n)*.*mov %eax, %eax/).length, 1);
break;
default:
throw "Unexpected compile mode";
}
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