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Lazily allocate faked ctx variables #2310

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Lazily allocate faked ctx variables #2310

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27 changes: 16 additions & 11 deletions internal/sys/sys.go
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Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,9 @@ func (c *Context) EnvironSize() uint32 {

// Walltime implements platform.Walltime.
func (c *Context) Walltime() (sec int64, nsec int32) {
if c.walltime == nil {
c.walltime = platform.NewFakeWalltime()
}
return c.walltime()
}

Expand All @@ -75,16 +78,25 @@ func (c *Context) WalltimeNanos() int64 {

// WalltimeResolution returns resolution of Walltime.
func (c *Context) WalltimeResolution() sys.ClockResolution {
if c.walltimeResolution == 0 {
c.walltimeResolution = sys.ClockResolution(time.Microsecond.Nanoseconds())
}
return c.walltimeResolution
}

// Nanotime implements sys.Nanotime.
func (c *Context) Nanotime() int64 {
if c.nanotime == nil {
c.nanotime = platform.NewFakeNanotime()
}
return c.nanotime()
}

// NanotimeResolution returns resolution of Nanotime.
func (c *Context) NanotimeResolution() sys.ClockResolution {
if c.nanotimeResolution == 0 {
c.nanotimeResolution = sys.ClockResolution(time.Nanosecond)
}
return c.nanotimeResolution
}

Expand All @@ -106,6 +118,9 @@ func (c *Context) FS() *FSContext {
// RandSource is a source of random bytes and defaults to a deterministic source.
// see wazero.ModuleConfig WithRandSource
func (c *Context) RandSource() io.Reader {
if c.randSource == nil {
c.randSource = platform.NewFakeRandSource()
}
return c.randSource
}

Expand Down Expand Up @@ -148,21 +163,14 @@ func NewContext(
return nil, fmt.Errorf("environ invalid: %w", err)
}

if randSource == nil {
sysCtx.randSource = platform.NewFakeRandSource()
} else {
sysCtx.randSource = randSource
}
sysCtx.randSource = randSource

if walltime != nil {
if clockResolutionInvalid(walltimeResolution) {
return nil, fmt.Errorf("invalid Walltime resolution: %d", walltimeResolution)
}
sysCtx.walltime = walltime
sysCtx.walltimeResolution = walltimeResolution
} else {
sysCtx.walltime = platform.NewFakeWalltime()
sysCtx.walltimeResolution = sys.ClockResolution(time.Microsecond.Nanoseconds())
}

if nanotime != nil {
Expand All @@ -171,9 +179,6 @@ func NewContext(
}
sysCtx.nanotime = nanotime
sysCtx.nanotimeResolution = nanotimeResolution
} else {
sysCtx.nanotime = platform.NewFakeNanotime()
sysCtx.nanotimeResolution = sys.ClockResolution(time.Nanosecond)
}

if nanosleep != nil {
Expand Down
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