...
Run Format

Source file src/cmd/dist/buildruntime.go

Documentation: cmd/dist

     1  // Copyright 2012 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 main
     6  
     7  import (
     8  	"bytes"
     9  	"fmt"
    10  	"os"
    11  	"strings"
    12  )
    13  
    14  /*
    15   * Helpers for building runtime.
    16   */
    17  
    18  // mkzversion writes zversion.go:
    19  //
    20  //	package sys
    21  //
    22  //	const TheVersion = <version>
    23  //	const Goexperiment = <goexperiment>
    24  //	const StackGuardMultiplier = <multiplier value>
    25  //
    26  func mkzversion(dir, file string) {
    27  	var buf bytes.Buffer
    28  	fmt.Fprintf(&buf, "// Code generated by go tool dist; DO NOT EDIT.\n")
    29  	fmt.Fprintln(&buf)
    30  	fmt.Fprintf(&buf, "package sys\n")
    31  	fmt.Fprintln(&buf)
    32  	fmt.Fprintf(&buf, "const TheVersion = `%s`\n", findgoversion())
    33  	fmt.Fprintf(&buf, "const Goexperiment = `%s`\n", os.Getenv("GOEXPERIMENT"))
    34  	fmt.Fprintf(&buf, "const StackGuardMultiplier = %d\n", stackGuardMultiplier())
    35  
    36  	writefile(buf.String(), file, writeSkipSame)
    37  }
    38  
    39  // mkzbootstrap writes cmd/internal/objabi/zbootstrap.go:
    40  //
    41  //	package objabi
    42  //
    43  //	const defaultGOROOT = <goroot>
    44  //	const defaultGO386 = <go386>
    45  //	const defaultGOARM = <goarm>
    46  //	const defaultGOMIPS = <gomips>
    47  //	const defaultGOOS = runtime.GOOS
    48  //	const defaultGOARCH = runtime.GOARCH
    49  //	const defaultGO_EXTLINK_ENABLED = <goextlinkenabled>
    50  //	const version = <version>
    51  //	const stackGuardMultiplier = <multiplier value>
    52  //	const goexperiment = <goexperiment>
    53  //
    54  // The use of runtime.GOOS and runtime.GOARCH makes sure that
    55  // a cross-compiled compiler expects to compile for its own target
    56  // system. That is, if on a Mac you do:
    57  //
    58  //	GOOS=linux GOARCH=ppc64 go build cmd/compile
    59  //
    60  // the resulting compiler will default to generating linux/ppc64 object files.
    61  // This is more useful than having it default to generating objects for the
    62  // original target (in this example, a Mac).
    63  func mkzbootstrap(file string) {
    64  	var buf bytes.Buffer
    65  	fmt.Fprintf(&buf, "// Code generated by go tool dist; DO NOT EDIT.\n")
    66  	fmt.Fprintln(&buf)
    67  	fmt.Fprintf(&buf, "package objabi\n")
    68  	fmt.Fprintln(&buf)
    69  	fmt.Fprintf(&buf, "import \"runtime\"\n")
    70  	fmt.Fprintln(&buf)
    71  	fmt.Fprintf(&buf, "const defaultGO386 = `%s`\n", go386)
    72  	fmt.Fprintf(&buf, "const defaultGOARM = `%s`\n", goarm)
    73  	fmt.Fprintf(&buf, "const defaultGOMIPS = `%s`\n", gomips)
    74  	fmt.Fprintf(&buf, "const defaultGOOS = runtime.GOOS\n")
    75  	fmt.Fprintf(&buf, "const defaultGOARCH = runtime.GOARCH\n")
    76  	fmt.Fprintf(&buf, "const defaultGO_EXTLINK_ENABLED = `%s`\n", goextlinkenabled)
    77  	fmt.Fprintf(&buf, "const version = `%s`\n", findgoversion())
    78  	fmt.Fprintf(&buf, "const stackGuardMultiplier = %d\n", stackGuardMultiplier())
    79  	fmt.Fprintf(&buf, "const goexperiment = `%s`\n", os.Getenv("GOEXPERIMENT"))
    80  
    81  	writefile(buf.String(), file, writeSkipSame)
    82  }
    83  
    84  // stackGuardMultiplier returns a multiplier to apply to the default
    85  // stack guard size. Larger multipliers are used for non-optimized
    86  // builds that have larger stack frames.
    87  func stackGuardMultiplier() int {
    88  	for _, s := range strings.Split(os.Getenv("GO_GCFLAGS"), " ") {
    89  		if s == "-N" {
    90  			return 2
    91  		}
    92  	}
    93  	return 1
    94  }
    95  

View as plain text