stack.go

     1  // Copyright 2011 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package objabi
     6  
     7  import "internal/buildcfg"
     8  
     9  // For the linkers. Must match Go definitions.
    10  
    11  const (
    12  	STACKSYSTEM = 0
    13  	StackSystem = STACKSYSTEM
    14  	StackBig    = 4096
    15  	StackSmall  = 128
    16  )
    17  
    18  // Initialize StackGuard and StackLimit according to target system.
    19  var StackGuard = 928*stackGuardMultiplier() + StackSystem
    20  var StackLimit = StackGuard - StackSystem - StackSmall
    21  
    22  // stackGuardMultiplier returns a multiplier to apply to the default
    23  // stack guard size. Larger multipliers are used for non-optimized
    24  // builds that have larger stack frames or for specific targets.
    25  func stackGuardMultiplier() int {
    26  	// On AIX, a larger stack is needed for syscalls.
    27  	if buildcfg.GOOS == "aix" {
    28  		return 2
    29  	}
    30  	return stackGuardMultiplierDefault
    31  }
    32
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