github.com/powerman/golang-tools@v0.1.11-0.20220410185822-5ad214d8d803/go/internal/packagesdriver/sizes.go (about)

     1  // Copyright 2018 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 packagesdriver fetches type sizes for go/packages and go/analysis.
     6  package packagesdriver
     7  
     8  import (
     9  	"context"
    10  	"fmt"
    11  	"go/types"
    12  	"strings"
    13  
    14  	"github.com/powerman/golang-tools/internal/gocommand"
    15  )
    16  
    17  var debug = false
    18  
    19  func GetSizesGolist(ctx context.Context, inv gocommand.Invocation, gocmdRunner *gocommand.Runner) (types.Sizes, error) {
    20  	inv.Verb = "list"
    21  	inv.Args = []string{"-f", "{{context.GOARCH}} {{context.Compiler}}", "--", "unsafe"}
    22  	stdout, stderr, friendlyErr, rawErr := gocmdRunner.RunRaw(ctx, inv)
    23  	var goarch, compiler string
    24  	if rawErr != nil {
    25  		if rawErrMsg := rawErr.Error(); strings.Contains(rawErrMsg, "cannot find main module") || strings.Contains(rawErrMsg, "go.mod file not found") {
    26  			// User's running outside of a module. All bets are off. Get GOARCH and guess compiler is gc.
    27  			// TODO(matloob): Is this a problem in practice?
    28  			inv.Verb = "env"
    29  			inv.Args = []string{"GOARCH"}
    30  			envout, enverr := gocmdRunner.Run(ctx, inv)
    31  			if enverr != nil {
    32  				return nil, enverr
    33  			}
    34  			goarch = strings.TrimSpace(envout.String())
    35  			compiler = "gc"
    36  		} else {
    37  			return nil, friendlyErr
    38  		}
    39  	} else {
    40  		fields := strings.Fields(stdout.String())
    41  		if len(fields) < 2 {
    42  			return nil, fmt.Errorf("could not parse GOARCH and Go compiler in format \"<GOARCH> <compiler>\":\nstdout: <<%s>>\nstderr: <<%s>>",
    43  				stdout.String(), stderr.String())
    44  		}
    45  		goarch = fields[0]
    46  		compiler = fields[1]
    47  	}
    48  	return types.SizesFor(compiler, goarch), nil
    49  }