runtime: manually initialize xorshift state

This ensures:

 1. The xorshift state is initialized during interp.
 2. The xorshift state gets initialized to a real random number on
    hardware that supports it at runtime.

Author: aykevl

src/runtime/algorithm.go

@@ -23,13 +23,13 @@ func fastrand() uint32 {
 	return xorshift32State
 }
 
-func init() {
+func initRand() {
 	r, _ := hardwareRand()
 	xorshift64State = uint64(r | 1) // protect against 0
 	xorshift32State = uint32(xorshift64State)
 }
 
-var xorshift32State uint32
+var xorshift32State uint32 = 1
 
 func xorshift32(x uint32) uint32 {
 	// Algorithm "xor" from p. 4 of Marsaglia, "Xorshift RNGs".
@@ -49,7 +49,7 @@ func fastrand64() uint64 {
 	return xorshift64State
 }
 
-var xorshift64State uint64
+var xorshift64State uint64 = 1
 
 // 64-bit xorshift multiply rng from http://vigna.di.unimi.it/ftp/papers/xorshift.pdf
 func xorshiftMult64(x uint64) uint64 {

src/runtime/runtime_wasmentry.go

@@ -35,6 +35,7 @@ func wasmEntryReactor() {
 	heapStart = uintptr(unsafe.Pointer(&heapStartSymbol))
 	heapEnd = uintptr(wasm_memory_size(0) * wasmPageSize)
 	initHeap()
+	initRand()
 
 	if hasScheduler {
 		// A package initializer might do funky stuff like start a goroutine and

src/runtime/scheduler_cooperative.go

@@ -247,6 +247,7 @@ func sleep(duration int64) {
 // With a scheduler, init and the main function are invoked in a goroutine before starting the scheduler.
 func run() {
 	initHeap()
+	initRand()
 	go func() {
 		initAll()
 		callMain()

src/runtime/scheduler_none.go

@@ -13,6 +13,7 @@ const hasParallelism = false
 // With the "none" scheduler, init and the main function are invoked directly.
 func run() {
 	initHeap()
+	initRand()
 	initAll()
 	callMain()
 	mainExited = true