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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package objabi
import "internal/buildcfg"
// For the linkers. Must match Go definitions.
const (
STACKSYSTEM = 0
StackSystem = STACKSYSTEM
StackBig = 4096
StackSmall = 128
)
func StackLimit(race bool) int {
// This arithmetic must match that in runtime/stack.go:{_StackGuard,_StackLimit}.
stackGuard := 928*stackGuardMultiplier(race) + StackSystem
stackLimit := stackGuard - StackSystem - StackSmall
return stackLimit
}
// stackGuardMultiplier returns a multiplier to apply to the default
// stack guard size. Larger multipliers are used for non-optimized
// builds that have larger stack frames or for specific targets.
func stackGuardMultiplier(race bool) int {
// This arithmetic must match that in runtime/internal/sys/consts.go:StackGuardMultiplier.
n := 1
// On AIX, a larger stack is needed for syscalls.
if buildcfg.GOOS == "aix" {
n += 1
}
// The race build also needs more stack.
if race {
n += 1
}
return n
}
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