load

package standard library
Version: go1.17.2 Latest Latest
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Published: Oct 7, 2021 License: BSD-3-Clause Imports: 37 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 TestMainDeps = []string{

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

Functions

func CheckPackageErrors added in go1.16

func CheckPackageErrors(pkgs []*Package)

CheckPackageErrors prints errors encountered loading pkgs and their dependencies, then exits with a non-zero status if any errors were found.

func ClearPackageCache

func ClearPackageCache()

ClearPackageCache clears the in-memory package cache and the preload caches. It is only for use by GOPATH-based "go get". TODO(jayconrod): When GOPATH-based "go get" is removed, delete this function.

func ClearPackageCachePartial

func ClearPackageCachePartial(args []string)

ClearPackageCachePartial clears packages with the given import paths from the in-memory package cache and the preload caches. It is only for use by GOPATH-based "go get". TODO(jayconrod): When GOPATH-based "go get" is removed, delete this function.

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 LinkerDeps added in go1.10

func LinkerDeps(p *Package) []string

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

func MatchPackage added in go1.10

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

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

func ResolveEmbed added in go1.16

func ResolveEmbed(dir string, patterns []string) ([]string, error)

ResolveEmbed resolves //go:embed patterns and returns only the file list. For use by go mod vendor to find embedded files it should copy into the vendor directory. TODO(#42504): Once go mod vendor uses load.PackagesAndErrors, just call (*Package).ResolveEmbed

func ResolveImportPath added in go1.9.7

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 added in go1.9.4

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.

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 EmbedError added in go1.16

type EmbedError struct {
	Pattern string
	Err     error
}

An EmbedError indicates a problem with a go:embed directive.

func (*EmbedError) Error added in go1.16

func (e *EmbedError) Error() string

func (*EmbedError) Unwrap added in go1.16

func (e *EmbedError) Unwrap() error

type ImportPathError added in go1.14

type ImportPathError interface {
	error
	ImportPath() string
}

ImportPathError is a type of error that prevents a package from being loaded for a given import path. When such a package is loaded, a *Package is returned with Err wrapping an ImportPathError: the error is attached to the imported package, not the importing package.

The string returned by ImportPath must appear in the string returned by Error. Errors that wrap ImportPathError (such as PackageError) may omit the import path.

func ImportErrorf added in go1.14

func ImportErrorf(path, format string, args ...interface{}) ImportPathError

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)

func (*ImportStack) Top added in go1.15

func (s *ImportStack) Top() string

type NoGoError

type NoGoError struct {
	Package *Package
}

A NoGoError indicates that no Go files for the package were applicable to the build for that package.

That may be because there were no files whatsoever, or because all files were excluded, or because all non-excluded files were test sources.

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(ctx context.Context, opts PackageOpts, 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(ctx context.Context, opts PackageOpts, 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 LoadImportWithFlags added in go1.13

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

LoadImportWithFlags loads the package with the given import path and sets tool flags on that package. This function is useful loading implicit dependencies (like sync/atomic for coverage). TODO(jayconrod): delete this function and set flags automatically in LoadImport instead.

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 PackagesAndErrors

func PackagesAndErrors(ctx context.Context, opts PackageOpts, patterns []string) []*Package

PackagesAndErrors returns the packages named by the command line arguments 'patterns'. If a named package cannot be loaded, PackagesAndErrors returns a *Package with the Error field describing the failure. If errors are found loading imported packages, the DepsErrors field is set. The Incomplete field may be set as well.

To obtain a flat list of packages, use PackageList. To report errors loading packages, use ReportPackageErrors.

func PackagesAndErrorsOutsideModule added in go1.17

func PackagesAndErrorsOutsideModule(ctx context.Context, opts PackageOpts, args []string) ([]*Package, error)

PackagesAndErrorsOutsideModule is like PackagesAndErrors but runs in module-aware mode and ignores the go.mod file in the current directory or any parent directory, if there is one. This is used in the implementation of 'go install pkg@version' and other commands that support similar forms.

modload.ForceUseModules must be true, and modload.RootMode must be NoRoot before calling this function.

PackagesAndErrorsOutsideModule imposes several constraints to avoid ambiguity. All arguments must have the same version suffix (not just a suffix that resolves to the same version). They must refer to packages in the same module, which must not be std or cmd. That module is not considered the main module, but its go.mod file (if it has one) must not contain directives that would cause it to be interpreted differently if it were the main module (replace, exclude).

func ReloadPackageNoFlags added in go1.11

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

ReloadPackageNoFlags is like LoadImport 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 added in go1.11

func TestPackageList(ctx context.Context, opts PackageOpts, 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 TestPackagesAndErrors added in go1.13

func TestPackagesAndErrors(ctx context.Context, opts PackageOpts, p *Package, cover *TestCover) (pmain, ptest, pxtest *Package)

TestPackagesAndErrors returns three packages:

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

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.

An error is returned if the testmain source cannot be completely generated (for example, due to a syntax error in a test file). No error will be returned for errors loading packages, but the Error or DepsError fields of the returned packages may be set.

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 TestPackagesFor added in go1.10

func TestPackagesFor(ctx context.Context, opts PackageOpts, p *Package, cover *TestCover) (pmain, ptest, pxtest *Package, err error)

TestPackagesFor is like TestPackagesAndErrors but it returns an error if the test packages or their dependencies have errors. Only test packages without errors are returned.

func (*Package) AllFiles added in go1.9.4

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) DefaultExecName added in go1.14

func (p *Package) DefaultExecName() string

DefaultExecName returns the default executable name for a package

func (*Package) Desc added in go1.11

func (p *Package) Desc() string

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

func (*Package) InternalAllGoFiles added in go1.10

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 added in go1.10

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

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

func (*Package) InternalXGoFiles added in go1.11

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

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

func (*Package) Resolve added in go1.9.7

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           error    // the error itself
	IsImportCycle bool     // the error is an import cycle
	Hard          bool     // whether the error is soft or hard; soft errors are ignored in some places
	// contains filtered or unexported fields
}

A PackageError describes an error loading information about a package.

func (*PackageError) Error

func (p *PackageError) Error() string

func (*PackageError) MarshalJSON added in go1.14

func (p *PackageError) MarshalJSON() ([]byte, error)

PackageError implements MarshalJSON so that Err is marshaled as a string and non-essential fields are omitted.

func (*PackageError) Unwrap added in go1.15

func (p *PackageError) Unwrap() error

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); 1:1 with the end of PackagePublic.Imports
	RawImports        []string             // this package's original imports as they appear in the text of the program; 1:1 with the end of PackagePublic.Imports
	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
	Embed             map[string][]string  // //go:embed comment mapping
	OrigImportPath    string               // original import path before adding '_test' suffix

	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 PackageOpts added in go1.17

type PackageOpts struct {
	// IgnoreImports controls whether we ignore explicit and implicit imports
	// when loading packages.  Implicit imports are added when supporting Cgo
	// or SWIG and when linking main packages.
	IgnoreImports bool

	// ModResolveTests indicates whether calls to the module loader should also
	// resolve test dependencies of the requested packages.
	//
	// If ModResolveTests is true, then the module loader needs to resolve test
	// dependencies at the same time as packages; otherwise, the test dependencies
	// of those packages could be missing, and resolving those missing dependencies
	// could change the selected versions of modules that provide other packages.
	ModResolveTests bool

	// MainOnly is true if the caller only wants to load main packages.
	// For a literal argument matching a non-main package, a stub may be returned
	// with an error. For a non-literal argument (with "..."), non-main packages
	// are not be matched, and their dependencies may not be loaded. A warning
	// may be printed for non-literal arguments that match no main packages.
	MainOnly bool
}

PackageOpts control the behavior of PackagesAndErrors and other package loading functions.

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, Go path dir, or module root 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)
	BuildID       string                `json:",omitempty"` // build ID of the compiled package (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
	InvalidGoFiles    []string `json:",omitempty"` // .go source files with detected problems (parse error, wrong package name, and so on)
	IgnoredOtherFiles []string `json:",omitempty"` // non-.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

	// Embedded files
	EmbedPatterns []string `json:",omitempty"` // //go:embed patterns
	EmbedFiles    []string `json:",omitempty"` // files matched by EmbedPatterns

	// 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
	TestEmbedPatterns  []string `json:",omitempty"` // //go:embed patterns
	TestEmbedFiles     []string `json:",omitempty"` // files matched by TestEmbedPatterns
	XTestGoFiles       []string `json:",omitempty"` // _test.go files outside package
	XTestImports       []string `json:",omitempty"` // imports from XTestGoFiles
	XTestEmbedPatterns []string `json:",omitempty"` // //go:embed patterns
	XTestEmbedFiles    []string `json:",omitempty"` // files matched by XTestEmbedPatterns
}

type PerPackageFlag added in go1.10

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 added in go1.10

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

For returns the flags to use for the given package.

func (*PerPackageFlag) Present added in go1.10

func (f *PerPackageFlag) Present() bool

Present reports whether the flag appeared on the command line.

func (*PerPackageFlag) Set added in go1.10

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

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

func (*PerPackageFlag) String added in go1.10

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 added in go1.10

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 added in go1.10

func InstallTargetDir(p *Package) TargetDir

InstallTargetDir reports the target directory for installing the command p.

type TestCover added in go1.11

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

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