load

package
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 Go to latest Published: Jun 18, 2019 License: BSD-3-Clause Imports: 23 Imported by: 0

Documentation

Overview

Package load loads packages.

Index

Constants

View Source 
const (
	// ResolveImport means that loadImport should do import path expansion.
	// That is, ResolveImport means that the import path came from
	// a source file and has not been expanded yet to account for
	// vendoring or possible module adjustment.
	// Every import path should be loaded initially with ResolveImport,
	// and then the expanded version (for example with the /vendor/ in it)
	// gets recorded as the canonical import path. At that point, future loads
	// of that package must not pass ResolveImport, because
	// disallowVendor will reject direct use of paths containing /vendor/.
	ResolveImport = 1 << iota

	// ResolveModule is for download (part of "go get") and indicates
	// that the module adjustment should be done, but not vendor adjustment.
	ResolveModule

	// GetTestDeps is for download (part of "go get") and indicates
	// that test dependencies should be fetched too.
	GetTestDeps
)

Mode flags for loadImport and download (in get.go).

Variables

View Source 
var (
	// module initialization hook; never nil, no-op if module use is disabled
	ModInit func()

	// module hooks; nil if module use is disabled
	ModBinDir            func() string                                       // return effective bin directory
	ModLookup            func(path string) (dir, realPath string, err error) // lookup effective meaning of import
	ModPackageModuleInfo func(path string) *modinfo.ModulePublic             // return module info for Package struct
	ModImportPaths       func(args []string) []*search.Match                 // expand import paths
	ModPackageBuildInfo  func(main string, deps []string) string             // return module info to embed in binary
	ModInfoProg          func(info string) []byte                            // wrap module info in .go code for binary
	ModImportFromFiles   func([]string)                                      // update go.mod to add modules for imports in these files
	ModDirImportPath     func(string) string                                 // return effective import path for directory
)
View Source 
var IgnoreImports bool // control whether we ignore imports in packages
View Source 
var TestMainDeps = []string{

	"os",
	"testing",
	"testing/internal/testdeps",
}

Functions

func ClearCmdCache 

func ClearCmdCache()

func ClearPackageCache 

func ClearPackageCache()

func ClearPackageCachePartial 

func ClearPackageCachePartial(args []string)

func DefaultExecName 

func DefaultExecName(importPath string) string

DefaultExecName returns the default executable name for a package with the import path importPath.

The default executable name is the last element of the import path. In module-aware mode, an additional rule is used. If the last element is a vN path element specifying the major version, then the second last element of the import path is used instead.

func FindVendor 

func FindVendor(path string) (index int, ok bool)

FindVendor looks for the last non-terminating "vendor" path element in the given import path. If there isn't one, FindVendor returns ok=false. Otherwise, FindVendor returns ok=true and the index of the "vendor".

Note that terminating "vendor" elements don't count: "x/vendor" is its own package, not the vendored copy of an import "" (the empty import path). This will allow people to have packages or commands named vendor. This may help reduce breakage, or it may just be confusing. We'll see.

func ImportPaths 

func ImportPaths(args []string) []*search.Match

func LinkerDeps 

func LinkerDeps(p *Package) []string

LinkerDeps returns the list of linker-induced dependencies for main package p.

func MatchPackage 

func MatchPackage(pattern, cwd string) func(*Package) bool

MatchPackage(pattern, cwd)(p) reports whether package p matches pattern in the working directory cwd.

func ModuleImportPath 

func ModuleImportPath(parent *Package, path string) (found string)

ModuleImportPath translates import paths found in go modules back down to paths that can be resolved in ordinary builds.

Define “new” code as code with a go.mod file in the same directory or a parent directory. If an import in new code says x/y/v2/z but x/y/v2/z does not exist and x/y/go.mod says “module x/y/v2”, then go build will read the import as x/y/z instead. See golang.org/issue/25069.

func ResolveImportPath 

func ResolveImportPath(parent *Package, path string) (found string)

ResolveImportPath returns the true meaning of path when it appears in parent. There are two different resolutions applied. First, there is Go 1.5 vendoring (golang.org/s/go15vendor). If vendor expansion doesn't trigger, then the path is also subject to Go 1.11 module legacy conversion (golang.org/issue/25069).

func SafeArg 

func SafeArg(name string) bool

SafeArg reports whether arg is a "safe" command-line argument, meaning that when it appears in a command-line, it probably doesn't have some special meaning other than its own name. Obviously args beginning with - are not safe (they look like flags). Less obviously, args beginning with @ are not safe (they look like GNU binutils flagfile specifiers, sometimes called "response files"). To be conservative, we reject almost any arg beginning with non-alphanumeric ASCII. We accept leading . _ and / as likely in file system paths. There is a copy of this function in cmd/compile/internal/gc/noder.go.

func VendoredImportPath 

func VendoredImportPath(parent *Package, path string) (found string)

VendoredImportPath returns the vendor-expansion of path when it appears in parent. If parent is x/y/z, then path might expand to x/y/z/vendor/path, x/y/vendor/path, x/vendor/path, vendor/path, or else stay path if none of those exist. VendoredImportPath returns the expanded path or, if no expansion is found, the original.

Types

type CoverVar 

type CoverVar struct {
	File string // local file name
	Var  string // name of count struct
}

CoverVar holds the name of the generated coverage variables targeting the named file.

type ImportStack 

type ImportStack []string

An ImportStack is a stack of import paths, possibly with the suffix " (test)" appended. The import path of a test package is the import path of the corresponding non-test package with the suffix "_test" added.

func (*ImportStack) Copy 

func (s *ImportStack) Copy() []string

func (*ImportStack) Pop 

func (s *ImportStack) Pop()

func (*ImportStack) Push 

func (s *ImportStack) Push(p string)

type NoGoError 

type NoGoError struct {
	Package *Package
}

func (*NoGoError) Error 

func (e *NoGoError) Error() string

type Package 

type Package struct {
	PackagePublic                 // visible in 'go list'
	Internal      PackageInternal // for use inside go command only
}

A Package describes a single package found in a directory.

func GoFilesPackage 

func GoFilesPackage(gofiles []string) *Package

GoFilesPackage creates a package for building a collection of Go files (typically named on the command line). The target is named p.a for package p or named after the first Go file for package main.

func LoadImport 

func LoadImport(path, srcDir string, parent *Package, stk *ImportStack, importPos []token.Position, mode int) *Package

LoadImport scans the directory named by path, which must be an import path, but possibly a local import path (an absolute file system path or one beginning with ./ or ../). A local relative path is interpreted relative to srcDir. It returns a *Package describing the package found in that directory. LoadImport does not set tool flags and should only be used by this package, as part of a bigger load operation, and by GOPATH-based "go get". TODO(rsc): When GOPATH-based "go get" is removed, unexport this function.

func LoadPackage 

func LoadPackage(arg string, stk *ImportStack) *Package

LoadPackage loads the package named by arg.

func LoadPackageNoFlags 

func LoadPackageNoFlags(arg string, stk *ImportStack) *Package

LoadPackageNoFlags is like LoadPackage but does not guarantee that the build tool flags are set in the result. It is only for use by GOPATH-based "go get" and is only appropriate for preliminary loading of packages. A real load using LoadPackage or (more likely) Packages, PackageAndErrors, or PackagesForBuild must be done before passing the package to any build steps, so that the tool flags can be set properly. TODO(rsc): When GOPATH-based "go get" is removed, delete this function.

func PackageList 

func PackageList(roots []*Package) []*Package

PackageList returns the list of packages in the dag rooted at roots as visited in a depth-first post-order traversal.

func Packages 

func Packages(args []string) []*Package

Packages returns the packages named by the command line arguments 'args'. If a named package cannot be loaded at all (for example, if the directory does not exist), then packages prints an error and does not include that package in the results. However, if errors occur trying to load dependencies of a named package, the named package is still returned, with p.Incomplete = true and details in p.DepsErrors.

func PackagesAndErrors 

func PackagesAndErrors(patterns []string) []*Package

PackagesAndErrors is like 'packages' but returns a *Package for every argument, even the ones that cannot be loaded at all. The packages that fail to load will have p.Error != nil.

func PackagesForBuild 

func PackagesForBuild(args []string) []*Package

PackagesForBuild is like Packages but exits if any of the packages or their dependencies have errors (cannot be built).

func ReloadPackageNoFlags 

func ReloadPackageNoFlags(arg string, stk *ImportStack) *Package

ReloadPackageNoFlags is like LoadPackageNoFlags but makes sure not to use the package cache. It is only for use by GOPATH-based "go get". TODO(rsc): When GOPATH-based "go get" is removed, delete this function.

func TestPackageList 

func TestPackageList(roots []*Package) []*Package

TestPackageList returns the list of packages in the dag rooted at roots as visited in a depth-first post-order traversal, including the test imports of the roots. This ignores errors in test packages.

func TestPackagesFor 

func TestPackagesFor(p *Package, cover *TestCover) (pmain, ptest, pxtest *Package, err error)

TestPackagesFor returns three packages:

  • ptest, the package p compiled with added "package p" test files.
  • pxtest, the result of compiling any "package p_test" (external) test files.
  • pmain, the package main corresponding to the test binary (running tests in ptest and pxtest).

If the package has no "package p_test" test files, pxtest will be nil. If the non-test compilation of package p can be reused (for example, if there are no "package p" test files and package p need not be instrumented for coverage or any other reason), then the returned ptest == p.

The caller is expected to have checked that len(p.TestGoFiles)+len(p.XTestGoFiles) > 0, or else there's no point in any of this.

func (*Package) AllFiles 

func (p *Package) AllFiles() []string

AllFiles returns the names of all the files considered for the package. This is used for sanity and security checks, so we include all files, even IgnoredGoFiles, because some subcommands consider them. The go/build package filtered others out (like foo_wrongGOARCH.s) and that's OK.

func (*Package) Desc 

func (p *Package) Desc() string

Desc returns the package "description", for use in b.showOutput.

func (*Package) InternalAllGoFiles 

func (p *Package) InternalAllGoFiles() []string

InternalGoFiles returns the list of all Go files possibly relevant for the package, using absolute paths. "Possibly relevant" means that files are not excluded due to build tags, but files with names beginning with . or _ are still excluded.

func (*Package) InternalGoFiles 

func (p *Package) InternalGoFiles() []string

InternalGoFiles returns the list of Go files being built for the package, using absolute paths.

func (*Package) InternalXGoFiles 

func (p *Package) InternalXGoFiles() []string

InternalXGoFiles returns the list of Go files being built for the XTest package, using absolute paths.

func (*Package) Resolve 

func (p *Package) Resolve(imports []string) []string

Resolve returns the resolved version of imports, which should be p.TestImports or p.XTestImports, NOT p.Imports. The imports in p.TestImports and p.XTestImports are not recursively loaded during the initial load of p, so they list the imports found in the source file, but most processing should be over the vendor-resolved import paths. We do this resolution lazily both to avoid file system work and because the eventual real load of the test imports (during 'go test') can produce better error messages if it starts with the original paths. The initial load of p loads all the non-test imports and rewrites the vendored paths, so nothing should ever call p.vendored(p.Imports).

func (*Package) UsesCgo 

func (p *Package) UsesCgo() bool

usesCgo reports whether the package needs to run cgo

func (*Package) UsesSwig 

func (p *Package) UsesSwig() bool

usesSwig reports whether the package needs to run SWIG.

type PackageError 

type PackageError struct {
	ImportStack   []string // shortest path from package named on command line to this one
	Pos           string   // position of error
	Err           string   // the error itself
	IsImportCycle bool     `json:"-"` // the error is an import cycle
	Hard          bool     `json:"-"` // whether the error is soft or hard; soft errors are ignored in some places
}

A PackageError describes an error loading information about a package.

func (*PackageError) Error 

func (p *PackageError) Error() string

type PackageInternal 

type PackageInternal struct {
	// Unexported fields are not part of the public API.
	Build             *build.Package
	Imports           []*Package           // this package's direct imports
	CompiledImports   []string             // additional Imports necessary when using CompiledGoFiles (all from standard library)
	RawImports        []string             // this package's original imports as they appear in the text of the program
	ForceLibrary      bool                 // this package is a library (even if named "main")
	CmdlineFiles      bool                 // package built from files listed on command line
	CmdlinePkg        bool                 // package listed on command line
	CmdlinePkgLiteral bool                 // package listed as literal on command line (not via wildcard)
	Local             bool                 // imported via local path (./ or ../)
	LocalPrefix       string               // interpret ./ and ../ imports relative to this prefix
	ExeName           string               // desired name for temporary executable
	CoverMode         string               // preprocess Go source files with the coverage tool in this mode
	CoverVars         map[string]*CoverVar // variables created by coverage analysis
	OmitDebug         bool                 // tell linker not to write debug information
	GobinSubdir       bool                 // install target would be subdir of GOBIN
	BuildInfo         string               // add this info to package main
	TestmainGo        *[]byte              // content for _testmain.go

	Asmflags   []string // -asmflags for this package
	Gcflags    []string // -gcflags for this package
	Ldflags    []string // -ldflags for this package
	Gccgoflags []string // -gccgoflags for this package
}

type PackagePublic 

type PackagePublic struct {
	// Note: These fields are part of the go command's public API.
	// See list.go. It is okay to add fields, but not to change or
	// remove existing ones. Keep in sync with list.go
	Dir           string                `json:",omitempty"` // directory containing package sources
	ImportPath    string                `json:",omitempty"` // import path of package in dir
	ImportComment string                `json:",omitempty"` // path in import comment on package statement
	Name          string                `json:",omitempty"` // package name
	Doc           string                `json:",omitempty"` // package documentation string
	Target        string                `json:",omitempty"` // installed target for this package (may be executable)
	Shlib         string                `json:",omitempty"` // the shared library that contains this package (only set when -linkshared)
	Root          string                `json:",omitempty"` // Go root or Go path dir containing this package
	ConflictDir   string                `json:",omitempty"` // Dir is hidden by this other directory
	ForTest       string                `json:",omitempty"` // package is only for use in named test
	Export        string                `json:",omitempty"` // file containing export data (set by go list -export)
	Module        *modinfo.ModulePublic `json:",omitempty"` // info about package's module, if any
	Match         []string              `json:",omitempty"` // command-line patterns matching this package
	Goroot        bool                  `json:",omitempty"` // is this package found in the Go root?
	Standard      bool                  `json:",omitempty"` // is this package part of the standard Go library?
	DepOnly       bool                  `json:",omitempty"` // package is only as a dependency, not explicitly listed
	BinaryOnly    bool                  `json:",omitempty"` // package cannot be recompiled
	Incomplete    bool                  `json:",omitempty"` // was there an error loading this package or dependencies?

	// Stale and StaleReason remain here *only* for the list command.
	// They are only initialized in preparation for list execution.
	// The regular build determines staleness on the fly during action execution.
	Stale       bool   `json:",omitempty"` // would 'go install' do anything for this package?
	StaleReason string `json:",omitempty"` // why is Stale true?

	// Source files
	// If you add to this list you MUST add to p.AllFiles (below) too.
	// Otherwise file name security lists will not apply to any new additions.
	GoFiles         []string `json:",omitempty"` // .go source files (excluding CgoFiles, TestGoFiles, XTestGoFiles)
	CgoFiles        []string `json:",omitempty"` // .go source files that import "C"
	CompiledGoFiles []string `json:",omitempty"` // .go output from running cgo on CgoFiles
	IgnoredGoFiles  []string `json:",omitempty"` // .go source files ignored due to build constraints
	CFiles          []string `json:",omitempty"` // .c source files
	CXXFiles        []string `json:",omitempty"` // .cc, .cpp and .cxx source files
	MFiles          []string `json:",omitempty"` // .m source files
	HFiles          []string `json:",omitempty"` // .h, .hh, .hpp and .hxx source files
	FFiles          []string `json:",omitempty"` // .f, .F, .for and .f90 Fortran source files
	SFiles          []string `json:",omitempty"` // .s source files
	SwigFiles       []string `json:",omitempty"` // .swig files
	SwigCXXFiles    []string `json:",omitempty"` // .swigcxx files
	SysoFiles       []string `json:",omitempty"` // .syso system object files added to package

	// Cgo directives
	CgoCFLAGS    []string `json:",omitempty"` // cgo: flags for C compiler
	CgoCPPFLAGS  []string `json:",omitempty"` // cgo: flags for C preprocessor
	CgoCXXFLAGS  []string `json:",omitempty"` // cgo: flags for C++ compiler
	CgoFFLAGS    []string `json:",omitempty"` // cgo: flags for Fortran compiler
	CgoLDFLAGS   []string `json:",omitempty"` // cgo: flags for linker
	CgoPkgConfig []string `json:",omitempty"` // cgo: pkg-config names

	// Dependency information
	Imports   []string          `json:",omitempty"` // import paths used by this package
	ImportMap map[string]string `json:",omitempty"` // map from source import to ImportPath (identity entries omitted)
	Deps      []string          `json:",omitempty"` // all (recursively) imported dependencies

	// Error information
	// Incomplete is above, packed into the other bools
	Error      *PackageError   `json:",omitempty"` // error loading this package (not dependencies)
	DepsErrors []*PackageError `json:",omitempty"` // errors loading dependencies

	// Test information
	// If you add to this list you MUST add to p.AllFiles (below) too.
	// Otherwise file name security lists will not apply to any new additions.
	TestGoFiles  []string `json:",omitempty"` // _test.go files in package
	TestImports  []string `json:",omitempty"` // imports from TestGoFiles
	XTestGoFiles []string `json:",omitempty"` // _test.go files outside package
	XTestImports []string `json:",omitempty"` // imports from XTestGoFiles
}

type PerPackageFlag 

type PerPackageFlag struct {
	// contains filtered or unexported fields
}

A PerPackageFlag is a command-line flag implementation (a flag.Value) that allows specifying different effective flags for different packages. See 'go help build' for more details about per-package flags. 

var (
	BuildAsmflags   PerPackageFlag // -asmflags
	BuildGcflags    PerPackageFlag // -gcflags
	BuildLdflags    PerPackageFlag // -ldflags
	BuildGccgoflags PerPackageFlag // -gccgoflags
)

func (*PerPackageFlag) For 

func (f *PerPackageFlag) For(p *Package) []string

For returns the flags to use for the given package.

func (*PerPackageFlag) Present 

func (f *PerPackageFlag) Present() bool

Present reports whether the flag appeared on the command line.

func (*PerPackageFlag) Set 

func (f *PerPackageFlag) Set(v string) error

Set is called each time the flag is encountered on the command line.

func (*PerPackageFlag) String 

func (f *PerPackageFlag) String() string

String is required to implement flag.Value. It is not used, because cmd/go never calls flag.PrintDefaults.

type TargetDir 

type TargetDir int
const (
	ToTool    TargetDir = iota // to GOROOT/pkg/tool (default for cmd/*)
	ToBin                      // to bin dir inside package root (default for non-cmd/*)
	StalePath                  // an old import path; fail to build
)

func InstallTargetDir 

func InstallTargetDir(p *Package) TargetDir

InstallTargetDir reports the target directory for installing the command p.

type TestCover 

type TestCover struct {
	Mode     string
	Local    bool
	Pkgs     []*Package
	Paths    []string
	Vars     []coverInfo
	DeclVars func(*Package, ...string) map[string]*CoverVar
}

Source Files

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