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misc/wasm: remove use of performance.timeOrigin 

This commit changes wasm_exec.js to not depend on the existence of
performance.timeOrigin. The field is not yet supported on all
browsers, e.g. it is unavailable on Safari.

Change-Id: I6cd3834376c1c55424c29166fde1219f0d4d338f
Reviewed-on: https://go-review.googlesource.com/118617
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Richard Musiol 2018-06-13 10:36:01 +02:00 committed by Brad Fitzpatrick
parent 7b2f55d89f
commit 72ce047a6c
1 changed files with 6 additions and 7 deletions
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13
misc/wasm/wasm_exec.js
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@ -16,13 +16,11 @@
}, },
}; };
const now = () => {
const [sec, nsec] = process.hrtime();
return sec * 1000 + nsec / 1000000;
};
global.performance = { global.performance = {
timeOrigin: Date.now() - now(), now() {
now: now, const [sec, nsec] = process.hrtime();
return sec * 1000 + nsec / 1000000;
},
}; };
const util = require("util"); const util = require("util");
@ -116,6 +114,7 @@
return decoder.decode(new DataView(this._inst.exports.mem.buffer, saddr, len)); return decoder.decode(new DataView(this._inst.exports.mem.buffer, saddr, len));
} }
const timeOrigin = Date.now() - performance.now();
this.importObject = { this.importObject = {
go: { go: {
// func wasmExit(code int32) // func wasmExit(code int32)
@ -133,7 +132,7 @@
// func nanotime() int64 // func nanotime() int64
"runtime.nanotime": (sp) => { "runtime.nanotime": (sp) => {
setInt64(sp + 8, (performance.timeOrigin + performance.now()) * 1000000); setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
}, },
// func walltime() (sec int64, nsec int32) // func walltime() (sec int64, nsec int32)