From 548090e67f66acf84385c4152ca464e52d3e3319 Mon Sep 17 00:00:00 2001 From: Thomas Voss Date: Fri, 13 Sep 2024 13:01:48 +0200 Subject: Migrate away from templ and towards html/template --- vendor/golang.org/x/tools/go/packages/doc.go | 242 ++++ vendor/golang.org/x/tools/go/packages/external.go | 156 ++ vendor/golang.org/x/tools/go/packages/golist.go | 1066 ++++++++++++++ .../x/tools/go/packages/golist_overlay.go | 83 ++ .../x/tools/go/packages/loadmode_string.go | 57 + vendor/golang.org/x/tools/go/packages/packages.go | 1515 ++++++++++++++++++++ vendor/golang.org/x/tools/go/packages/visit.go | 68 + 7 files changed, 3187 insertions(+) create mode 100644 vendor/golang.org/x/tools/go/packages/doc.go create mode 100644 vendor/golang.org/x/tools/go/packages/external.go create mode 100644 vendor/golang.org/x/tools/go/packages/golist.go create mode 100644 vendor/golang.org/x/tools/go/packages/golist_overlay.go create mode 100644 vendor/golang.org/x/tools/go/packages/loadmode_string.go create mode 100644 vendor/golang.org/x/tools/go/packages/packages.go create mode 100644 vendor/golang.org/x/tools/go/packages/visit.go (limited to 'vendor/golang.org/x/tools/go/packages') diff --git a/vendor/golang.org/x/tools/go/packages/doc.go b/vendor/golang.org/x/tools/go/packages/doc.go new file mode 100644 index 0000000..3531ac8 --- /dev/null +++ b/vendor/golang.org/x/tools/go/packages/doc.go @@ -0,0 +1,242 @@ +// Copyright 2018 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +/* +Package packages loads Go packages for inspection and analysis. + +The [Load] function takes as input a list of patterns and returns a +list of [Package] values describing individual packages matched by those +patterns. +A [Config] specifies configuration options, the most important of which is +the [LoadMode], which controls the amount of detail in the loaded packages. + +Load passes most patterns directly to the underlying build tool. +The default build tool is the go command. +Its supported patterns are described at +https://pkg.go.dev/cmd/go#hdr-Package_lists_and_patterns. +Other build systems may be supported by providing a "driver"; +see [The driver protocol]. + +All patterns with the prefix "query=", where query is a +non-empty string of letters from [a-z], are reserved and may be +interpreted as query operators. + +Two query operators are currently supported: "file" and "pattern". + +The query "file=path/to/file.go" matches the package or packages enclosing +the Go source file path/to/file.go. For example "file=~/go/src/fmt/print.go" +might return the packages "fmt" and "fmt [fmt.test]". + +The query "pattern=string" causes "string" to be passed directly to +the underlying build tool. In most cases this is unnecessary, +but an application can use Load("pattern=" + x) as an escaping mechanism +to ensure that x is not interpreted as a query operator if it contains '='. + +All other query operators are reserved for future use and currently +cause Load to report an error. + +The Package struct provides basic information about the package, including + + - ID, a unique identifier for the package in the returned set; + - GoFiles, the names of the package's Go source files; + - Imports, a map from source import strings to the Packages they name; + - Types, the type information for the package's exported symbols; + - Syntax, the parsed syntax trees for the package's source code; and + - TypesInfo, the result of a complete type-check of the package syntax trees. + +(See the documentation for type Package for the complete list of fields +and more detailed descriptions.) + +For example, + + Load(nil, "bytes", "unicode...") + +returns four Package structs describing the standard library packages +bytes, unicode, unicode/utf16, and unicode/utf8. Note that one pattern +can match multiple packages and that a package might be matched by +multiple patterns: in general it is not possible to determine which +packages correspond to which patterns. + +Note that the list returned by Load contains only the packages matched +by the patterns. Their dependencies can be found by walking the import +graph using the Imports fields. + +The Load function can be configured by passing a pointer to a Config as +the first argument. A nil Config is equivalent to the zero Config, which +causes Load to run in LoadFiles mode, collecting minimal information. +See the documentation for type Config for details. + +As noted earlier, the Config.Mode controls the amount of detail +reported about the loaded packages. See the documentation for type LoadMode +for details. + +Most tools should pass their command-line arguments (after any flags) +uninterpreted to [Load], so that it can interpret them +according to the conventions of the underlying build system. + +See the Example function for typical usage. + +# The driver protocol + +[Load] may be used to load Go packages even in Go projects that use +alternative build systems, by installing an appropriate "driver" +program for the build system and specifying its location in the +GOPACKAGESDRIVER environment variable. +For example, +https://github.com/bazelbuild/rules_go/wiki/Editor-and-tool-integration +explains how to use the driver for Bazel. + +The driver program is responsible for interpreting patterns in its +preferred notation and reporting information about the packages that +those patterns identify. Drivers must also support the special "file=" +and "pattern=" patterns described above. + +The patterns are provided as positional command-line arguments. A +JSON-encoded [DriverRequest] message providing additional information +is written to the driver's standard input. The driver must write a +JSON-encoded [DriverResponse] message to its standard output. (This +message differs from the JSON schema produced by 'go list'.) +*/ +package packages // import "golang.org/x/tools/go/packages" + +/* + +Motivation and design considerations + +The new package's design solves problems addressed by two existing +packages: go/build, which locates and describes packages, and +golang.org/x/tools/go/loader, which loads, parses and type-checks them. +The go/build.Package structure encodes too much of the 'go build' way +of organizing projects, leaving us in need of a data type that describes a +package of Go source code independent of the underlying build system. +We wanted something that works equally well with go build and vgo, and +also other build systems such as Bazel and Blaze, making it possible to +construct analysis tools that work in all these environments. +Tools such as errcheck and staticcheck were essentially unavailable to +the Go community at Google, and some of Google's internal tools for Go +are unavailable externally. +This new package provides a uniform way to obtain package metadata by +querying each of these build systems, optionally supporting their +preferred command-line notations for packages, so that tools integrate +neatly with users' build environments. The Metadata query function +executes an external query tool appropriate to the current workspace. + +Loading packages always returns the complete import graph "all the way down", +even if all you want is information about a single package, because the query +mechanisms of all the build systems we currently support ({go,vgo} list, and +blaze/bazel aspect-based query) cannot provide detailed information +about one package without visiting all its dependencies too, so there is +no additional asymptotic cost to providing transitive information. +(This property might not be true of a hypothetical 5th build system.) + +In calls to TypeCheck, all initial packages, and any package that +transitively depends on one of them, must be loaded from source. +Consider A->B->C->D->E: if A,C are initial, A,B,C must be loaded from +source; D may be loaded from export data, and E may not be loaded at all +(though it's possible that D's export data mentions it, so a +types.Package may be created for it and exposed.) + +The old loader had a feature to suppress type-checking of function +bodies on a per-package basis, primarily intended to reduce the work of +obtaining type information for imported packages. Now that imports are +satisfied by export data, the optimization no longer seems necessary. + +Despite some early attempts, the old loader did not exploit export data, +instead always using the equivalent of WholeProgram mode. This was due +to the complexity of mixing source and export data packages (now +resolved by the upward traversal mentioned above), and because export data +files were nearly always missing or stale. Now that 'go build' supports +caching, all the underlying build systems can guarantee to produce +export data in a reasonable (amortized) time. + +Test "main" packages synthesized by the build system are now reported as +first-class packages, avoiding the need for clients (such as go/ssa) to +reinvent this generation logic. + +One way in which go/packages is simpler than the old loader is in its +treatment of in-package tests. In-package tests are packages that +consist of all the files of the library under test, plus the test files. +The old loader constructed in-package tests by a two-phase process of +mutation called "augmentation": first it would construct and type check +all the ordinary library packages and type-check the packages that +depend on them; then it would add more (test) files to the package and +type-check again. This two-phase approach had four major problems: +1) in processing the tests, the loader modified the library package, + leaving no way for a client application to see both the test + package and the library package; one would mutate into the other. +2) because test files can declare additional methods on types defined in + the library portion of the package, the dispatch of method calls in + the library portion was affected by the presence of the test files. + This should have been a clue that the packages were logically + different. +3) this model of "augmentation" assumed at most one in-package test + per library package, which is true of projects using 'go build', + but not other build systems. +4) because of the two-phase nature of test processing, all packages that + import the library package had to be processed before augmentation, + forcing a "one-shot" API and preventing the client from calling Load + in several times in sequence as is now possible in WholeProgram mode. + (TypeCheck mode has a similar one-shot restriction for a different reason.) + +Early drafts of this package supported "multi-shot" operation. +Although it allowed clients to make a sequence of calls (or concurrent +calls) to Load, building up the graph of Packages incrementally, +it was of marginal value: it complicated the API +(since it allowed some options to vary across calls but not others), +it complicated the implementation, +it cannot be made to work in Types mode, as explained above, +and it was less efficient than making one combined call (when this is possible). +Among the clients we have inspected, none made multiple calls to load +but could not be easily and satisfactorily modified to make only a single call. +However, applications changes may be required. +For example, the ssadump command loads the user-specified packages +and in addition the runtime package. It is tempting to simply append +"runtime" to the user-provided list, but that does not work if the user +specified an ad-hoc package such as [a.go b.go]. +Instead, ssadump no longer requests the runtime package, +but seeks it among the dependencies of the user-specified packages, +and emits an error if it is not found. + +Questions & Tasks + +- Add GOARCH/GOOS? + They are not portable concepts, but could be made portable. + Our goal has been to allow users to express themselves using the conventions + of the underlying build system: if the build system honors GOARCH + during a build and during a metadata query, then so should + applications built atop that query mechanism. + Conversely, if the target architecture of the build is determined by + command-line flags, the application can pass the relevant + flags through to the build system using a command such as: + myapp -query_flag="--cpu=amd64" -query_flag="--os=darwin" + However, this approach is low-level, unwieldy, and non-portable. + GOOS and GOARCH seem important enough to warrant a dedicated option. + +- How should we handle partial failures such as a mixture of good and + malformed patterns, existing and non-existent packages, successful and + failed builds, import failures, import cycles, and so on, in a call to + Load? + +- Support bazel, blaze, and go1.10 list, not just go1.11 list. + +- Handle (and test) various partial success cases, e.g. + a mixture of good packages and: + invalid patterns + nonexistent packages + empty packages + packages with malformed package or import declarations + unreadable files + import cycles + other parse errors + type errors + Make sure we record errors at the correct place in the graph. + +- Missing packages among initial arguments are not reported. + Return bogus packages for them, like golist does. + +- "undeclared name" errors (for example) are reported out of source file + order. I suspect this is due to the breadth-first resolution now used + by go/types. Is that a bug? Discuss with gri. + +*/ diff --git a/vendor/golang.org/x/tools/go/packages/external.go b/vendor/golang.org/x/tools/go/packages/external.go new file mode 100644 index 0000000..c2b4b71 --- /dev/null +++ b/vendor/golang.org/x/tools/go/packages/external.go @@ -0,0 +1,156 @@ +// Copyright 2018 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package packages + +// This file defines the protocol that enables an external "driver" +// tool to supply package metadata in place of 'go list'. + +import ( + "bytes" + "encoding/json" + "fmt" + "os" + "os/exec" + "strings" +) + +// DriverRequest defines the schema of a request for package metadata +// from an external driver program. The JSON-encoded DriverRequest +// message is provided to the driver program's standard input. The +// query patterns are provided as command-line arguments. +// +// See the package documentation for an overview. +type DriverRequest struct { + Mode LoadMode `json:"mode"` + + // Env specifies the environment the underlying build system should be run in. + Env []string `json:"env"` + + // BuildFlags are flags that should be passed to the underlying build system. + BuildFlags []string `json:"build_flags"` + + // Tests specifies whether the patterns should also return test packages. + Tests bool `json:"tests"` + + // Overlay maps file paths (relative to the driver's working directory) + // to the contents of overlay files (see Config.Overlay). + Overlay map[string][]byte `json:"overlay"` +} + +// DriverResponse defines the schema of a response from an external +// driver program, providing the results of a query for package +// metadata. The driver program must write a JSON-encoded +// DriverResponse message to its standard output. +// +// See the package documentation for an overview. +type DriverResponse struct { + // NotHandled is returned if the request can't be handled by the current + // driver. If an external driver returns a response with NotHandled, the + // rest of the DriverResponse is ignored, and go/packages will fallback + // to the next driver. If go/packages is extended in the future to support + // lists of multiple drivers, go/packages will fall back to the next driver. + NotHandled bool + + // Compiler and Arch are the arguments pass of types.SizesFor + // to get a types.Sizes to use when type checking. + Compiler string + Arch string + + // Roots is the set of package IDs that make up the root packages. + // We have to encode this separately because when we encode a single package + // we cannot know if it is one of the roots as that requires knowledge of the + // graph it is part of. + Roots []string `json:",omitempty"` + + // Packages is the full set of packages in the graph. + // The packages are not connected into a graph. + // The Imports if populated will be stubs that only have their ID set. + // Imports will be connected and then type and syntax information added in a + // later pass (see refine). + Packages []*Package + + // GoVersion is the minor version number used by the driver + // (e.g. the go command on the PATH) when selecting .go files. + // Zero means unknown. + GoVersion int +} + +// driver is the type for functions that query the build system for the +// packages named by the patterns. +type driver func(cfg *Config, patterns ...string) (*DriverResponse, error) + +// findExternalDriver returns the file path of a tool that supplies +// the build system package structure, or "" if not found." +// If GOPACKAGESDRIVER is set in the environment findExternalTool returns its +// value, otherwise it searches for a binary named gopackagesdriver on the PATH. +func findExternalDriver(cfg *Config) driver { + const toolPrefix = "GOPACKAGESDRIVER=" + tool := "" + for _, env := range cfg.Env { + if val := strings.TrimPrefix(env, toolPrefix); val != env { + tool = val + } + } + if tool != "" && tool == "off" { + return nil + } + if tool == "" { + var err error + tool, err = exec.LookPath("gopackagesdriver") + if err != nil { + return nil + } + } + return func(cfg *Config, words ...string) (*DriverResponse, error) { + req, err := json.Marshal(DriverRequest{ + Mode: cfg.Mode, + Env: cfg.Env, + BuildFlags: cfg.BuildFlags, + Tests: cfg.Tests, + Overlay: cfg.Overlay, + }) + if err != nil { + return nil, fmt.Errorf("failed to encode message to driver tool: %v", err) + } + + buf := new(bytes.Buffer) + stderr := new(bytes.Buffer) + cmd := exec.CommandContext(cfg.Context, tool, words...) + cmd.Dir = cfg.Dir + // The cwd gets resolved to the real path. On Darwin, where + // /tmp is a symlink, this breaks anything that expects the + // working directory to keep the original path, including the + // go command when dealing with modules. + // + // os.Getwd stdlib has a special feature where if the + // cwd and the PWD are the same node then it trusts + // the PWD, so by setting it in the env for the child + // process we fix up all the paths returned by the go + // command. + // + // (See similar trick in Invocation.run in ../../internal/gocommand/invoke.go) + cmd.Env = append(slicesClip(cfg.Env), "PWD="+cfg.Dir) + cmd.Stdin = bytes.NewReader(req) + cmd.Stdout = buf + cmd.Stderr = stderr + + if err := cmd.Run(); err != nil { + return nil, fmt.Errorf("%v: %v: %s", tool, err, cmd.Stderr) + } + if len(stderr.Bytes()) != 0 && os.Getenv("GOPACKAGESPRINTDRIVERERRORS") != "" { + fmt.Fprintf(os.Stderr, "%s stderr: <<%s>>\n", cmdDebugStr(cmd), stderr) + } + + var response DriverResponse + if err := json.Unmarshal(buf.Bytes(), &response); err != nil { + return nil, err + } + return &response, nil + } +} + +// slicesClip removes unused capacity from the slice, returning s[:len(s):len(s)]. +// TODO(adonovan): use go1.21 slices.Clip. +func slicesClip[S ~[]E, E any](s S) S { return s[:len(s):len(s)] } diff --git a/vendor/golang.org/x/tools/go/packages/golist.go b/vendor/golang.org/x/tools/go/packages/golist.go new file mode 100644 index 0000000..1a3a5b4 --- /dev/null +++ b/vendor/golang.org/x/tools/go/packages/golist.go @@ -0,0 +1,1066 @@ +// Copyright 2018 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package packages + +import ( + "bytes" + "context" + "encoding/json" + "fmt" + "log" + "os" + "os/exec" + "path" + "path/filepath" + "reflect" + "sort" + "strconv" + "strings" + "sync" + "unicode" + + "golang.org/x/tools/internal/gocommand" + "golang.org/x/tools/internal/packagesinternal" +) + +// debug controls verbose logging. +var debug, _ = strconv.ParseBool(os.Getenv("GOPACKAGESDEBUG")) + +// A goTooOldError reports that the go command +// found by exec.LookPath is too old to use the new go list behavior. +type goTooOldError struct { + error +} + +// responseDeduper wraps a DriverResponse, deduplicating its contents. +type responseDeduper struct { + seenRoots map[string]bool + seenPackages map[string]*Package + dr *DriverResponse +} + +func newDeduper() *responseDeduper { + return &responseDeduper{ + dr: &DriverResponse{}, + seenRoots: map[string]bool{}, + seenPackages: map[string]*Package{}, + } +} + +// addAll fills in r with a DriverResponse. +func (r *responseDeduper) addAll(dr *DriverResponse) { + for _, pkg := range dr.Packages { + r.addPackage(pkg) + } + for _, root := range dr.Roots { + r.addRoot(root) + } + r.dr.GoVersion = dr.GoVersion +} + +func (r *responseDeduper) addPackage(p *Package) { + if r.seenPackages[p.ID] != nil { + return + } + r.seenPackages[p.ID] = p + r.dr.Packages = append(r.dr.Packages, p) +} + +func (r *responseDeduper) addRoot(id string) { + if r.seenRoots[id] { + return + } + r.seenRoots[id] = true + r.dr.Roots = append(r.dr.Roots, id) +} + +type golistState struct { + cfg *Config + ctx context.Context + + envOnce sync.Once + goEnvError error + goEnv map[string]string + + rootsOnce sync.Once + rootDirsError error + rootDirs map[string]string + + goVersionOnce sync.Once + goVersionError error + goVersion int // The X in Go 1.X. + + // vendorDirs caches the (non)existence of vendor directories. + vendorDirs map[string]bool +} + +// getEnv returns Go environment variables. Only specific variables are +// populated -- computing all of them is slow. +func (state *golistState) getEnv() (map[string]string, error) { + state.envOnce.Do(func() { + var b *bytes.Buffer + b, state.goEnvError = state.invokeGo("env", "-json", "GOMOD", "GOPATH") + if state.goEnvError != nil { + return + } + + state.goEnv = make(map[string]string) + decoder := json.NewDecoder(b) + if state.goEnvError = decoder.Decode(&state.goEnv); state.goEnvError != nil { + return + } + }) + return state.goEnv, state.goEnvError +} + +// mustGetEnv is a convenience function that can be used if getEnv has already succeeded. +func (state *golistState) mustGetEnv() map[string]string { + env, err := state.getEnv() + if err != nil { + panic(fmt.Sprintf("mustGetEnv: %v", err)) + } + return env +} + +// goListDriver uses the go list command to interpret the patterns and produce +// the build system package structure. +// See driver for more details. +func goListDriver(cfg *Config, patterns ...string) (_ *DriverResponse, err error) { + // Make sure that any asynchronous go commands are killed when we return. + parentCtx := cfg.Context + if parentCtx == nil { + parentCtx = context.Background() + } + ctx, cancel := context.WithCancel(parentCtx) + defer cancel() + + response := newDeduper() + + state := &golistState{ + cfg: cfg, + ctx: ctx, + vendorDirs: map[string]bool{}, + } + + // Fill in response.Sizes asynchronously if necessary. + if cfg.Mode&NeedTypesSizes != 0 || cfg.Mode&NeedTypes != 0 { + errCh := make(chan error) + go func() { + compiler, arch, err := getSizesForArgs(ctx, state.cfgInvocation(), cfg.gocmdRunner) + response.dr.Compiler = compiler + response.dr.Arch = arch + errCh <- err + }() + defer func() { + if sizesErr := <-errCh; sizesErr != nil { + err = sizesErr + } + }() + } + + // Determine files requested in contains patterns + var containFiles []string + restPatterns := make([]string, 0, len(patterns)) + // Extract file= and other [querytype]= patterns. Report an error if querytype + // doesn't exist. +extractQueries: + for _, pattern := range patterns { + eqidx := strings.Index(pattern, "=") + if eqidx < 0 { + restPatterns = append(restPatterns, pattern) + } else { + query, value := pattern[:eqidx], pattern[eqidx+len("="):] + switch query { + case "file": + containFiles = append(containFiles, value) + case "pattern": + restPatterns = append(restPatterns, value) + case "": // not a reserved query + restPatterns = append(restPatterns, pattern) + default: + for _, rune := range query { + if rune < 'a' || rune > 'z' { // not a reserved query + restPatterns = append(restPatterns, pattern) + continue extractQueries + } + } + // Reject all other patterns containing "=" + return nil, fmt.Errorf("invalid query type %q in query pattern %q", query, pattern) + } + } + } + + // See if we have any patterns to pass through to go list. Zero initial + // patterns also requires a go list call, since it's the equivalent of + // ".". + if len(restPatterns) > 0 || len(patterns) == 0 { + dr, err := state.createDriverResponse(restPatterns...) + if err != nil { + return nil, err + } + response.addAll(dr) + } + + if len(containFiles) != 0 { + if err := state.runContainsQueries(response, containFiles); err != nil { + return nil, err + } + } + + // (We may yet return an error due to defer.) + return response.dr, nil +} + +func (state *golistState) runContainsQueries(response *responseDeduper, queries []string) error { + for _, query := range queries { + // TODO(matloob): Do only one query per directory. + fdir := filepath.Dir(query) + // Pass absolute path of directory to go list so that it knows to treat it as a directory, + // not a package path. + pattern, err := filepath.Abs(fdir) + if err != nil { + return fmt.Errorf("could not determine absolute path of file= query path %q: %v", query, err) + } + dirResponse, err := state.createDriverResponse(pattern) + + // If there was an error loading the package, or no packages are returned, + // or the package is returned with errors, try to load the file as an + // ad-hoc package. + // Usually the error will appear in a returned package, but may not if we're + // in module mode and the ad-hoc is located outside a module. + if err != nil || len(dirResponse.Packages) == 0 || len(dirResponse.Packages) == 1 && len(dirResponse.Packages[0].GoFiles) == 0 && + len(dirResponse.Packages[0].Errors) == 1 { + var queryErr error + if dirResponse, queryErr = state.adhocPackage(pattern, query); queryErr != nil { + return err // return the original error + } + } + isRoot := make(map[string]bool, len(dirResponse.Roots)) + for _, root := range dirResponse.Roots { + isRoot[root] = true + } + for _, pkg := range dirResponse.Packages { + // Add any new packages to the main set + // We don't bother to filter packages that will be dropped by the changes of roots, + // that will happen anyway during graph construction outside this function. + // Over-reporting packages is not a problem. + response.addPackage(pkg) + // if the package was not a root one, it cannot have the file + if !isRoot[pkg.ID] { + continue + } + for _, pkgFile := range pkg.GoFiles { + if filepath.Base(query) == filepath.Base(pkgFile) { + response.addRoot(pkg.ID) + break + } + } + } + } + return nil +} + +// adhocPackage attempts to load or construct an ad-hoc package for a given +// query, if the original call to the driver produced inadequate results. +func (state *golistState) adhocPackage(pattern, query string) (*DriverResponse, error) { + response, err := state.createDriverResponse(query) + if err != nil { + return nil, err + } + // If we get nothing back from `go list`, + // try to make this file into its own ad-hoc package. + // TODO(rstambler): Should this check against the original response? + if len(response.Packages) == 0 { + response.Packages = append(response.Packages, &Package{ + ID: "command-line-arguments", + PkgPath: query, + GoFiles: []string{query}, + CompiledGoFiles: []string{query}, + Imports: make(map[string]*Package), + }) + response.Roots = append(response.Roots, "command-line-arguments") + } + // Handle special cases. + if len(response.Packages) == 1 { + // golang/go#33482: If this is a file= query for ad-hoc packages where + // the file only exists on an overlay, and exists outside of a module, + // add the file to the package and remove the errors. + if response.Packages[0].ID == "command-line-arguments" || + filepath.ToSlash(response.Packages[0].PkgPath) == filepath.ToSlash(query) { + if len(response.Packages[0].GoFiles) == 0 { + filename := filepath.Join(pattern, filepath.Base(query)) // avoid recomputing abspath + // TODO(matloob): check if the file is outside of a root dir? + for path := range state.cfg.Overlay { + if path == filename { + response.Packages[0].Errors = nil + response.Packages[0].GoFiles = []string{path} + response.Packages[0].CompiledGoFiles = []string{path} + } + } + } + } + } + return response, nil +} + +// Fields must match go list; +// see $GOROOT/src/cmd/go/internal/load/pkg.go. +type jsonPackage struct { + ImportPath string + Dir string + Name string + Export string + GoFiles []string + CompiledGoFiles []string + IgnoredGoFiles []string + IgnoredOtherFiles []string + EmbedPatterns []string + EmbedFiles []string + CFiles []string + CgoFiles []string + CXXFiles []string + MFiles []string + HFiles []string + FFiles []string + SFiles []string + SwigFiles []string + SwigCXXFiles []string + SysoFiles []string + Imports []string + ImportMap map[string]string + Deps []string + Module *Module + TestGoFiles []string + TestImports []string + XTestGoFiles []string + XTestImports []string + ForTest string // q in a "p [q.test]" package, else "" + DepOnly bool + + Error *packagesinternal.PackageError + DepsErrors []*packagesinternal.PackageError +} + +type jsonPackageError struct { + ImportStack []string + Pos string + Err string +} + +func otherFiles(p *jsonPackage) [][]string { + return [][]string{p.CFiles, p.CXXFiles, p.MFiles, p.HFiles, p.FFiles, p.SFiles, p.SwigFiles, p.SwigCXXFiles, p.SysoFiles} +} + +// createDriverResponse uses the "go list" command to expand the pattern +// words and return a response for the specified packages. +func (state *golistState) createDriverResponse(words ...string) (*DriverResponse, error) { + // go list uses the following identifiers in ImportPath and Imports: + // + // "p" -- importable package or main (command) + // "q.test" -- q's test executable + // "p [q.test]" -- variant of p as built for q's test executable + // "q_test [q.test]" -- q's external test package + // + // The packages p that are built differently for a test q.test + // are q itself, plus any helpers used by the external test q_test, + // typically including "testing" and all its dependencies. + + // Run "go list" for complete + // information on the specified packages. + goVersion, err := state.getGoVersion() + if err != nil { + return nil, err + } + buf, err := state.invokeGo("list", golistargs(state.cfg, words, goVersion)...) + if err != nil { + return nil, err + } + + seen := make(map[string]*jsonPackage) + pkgs := make(map[string]*Package) + additionalErrors := make(map[string][]Error) + // Decode the JSON and convert it to Package form. + response := &DriverResponse{ + GoVersion: goVersion, + } + for dec := json.NewDecoder(buf); dec.More(); { + p := new(jsonPackage) + if err := dec.Decode(p); err != nil { + return nil, fmt.Errorf("JSON decoding failed: %v", err) + } + + if p.ImportPath == "" { + // The documentation for go list says that “[e]rroneous packages will have + // a non-empty ImportPath”. If for some reason it comes back empty, we + // prefer to error out rather than silently discarding data or handing + // back a package without any way to refer to it. + if p.Error != nil { + return nil, Error{ + Pos: p.Error.Pos, + Msg: p.Error.Err, + } + } + return nil, fmt.Errorf("package missing import path: %+v", p) + } + + // Work around https://golang.org/issue/33157: + // go list -e, when given an absolute path, will find the package contained at + // that directory. But when no package exists there, it will return a fake package + // with an error and the ImportPath set to the absolute path provided to go list. + // Try to convert that absolute path to what its package path would be if it's + // contained in a known module or GOPATH entry. This will allow the package to be + // properly "reclaimed" when overlays are processed. + if filepath.IsAbs(p.ImportPath) && p.Error != nil { + pkgPath, ok, err := state.getPkgPath(p.ImportPath) + if err != nil { + return nil, err + } + if ok { + p.ImportPath = pkgPath + } + } + + if old, found := seen[p.ImportPath]; found { + // If one version of the package has an error, and the other doesn't, assume + // that this is a case where go list is reporting a fake dependency variant + // of the imported package: When a package tries to invalidly import another + // package, go list emits a variant of the imported package (with the same + // import path, but with an error on it, and the package will have a + // DepError set on it). An example of when this can happen is for imports of + // main packages: main packages can not be imported, but they may be + // separately matched and listed by another pattern. + // See golang.org/issue/36188 for more details. + + // The plan is that eventually, hopefully in Go 1.15, the error will be + // reported on the importing package rather than the duplicate "fake" + // version of the imported package. Once all supported versions of Go + // have the new behavior this logic can be deleted. + // TODO(matloob): delete the workaround logic once all supported versions of + // Go return the errors on the proper package. + + // There should be exactly one version of a package that doesn't have an + // error. + if old.Error == nil && p.Error == nil { + if !reflect.DeepEqual(p, old) { + return nil, fmt.Errorf("internal error: go list gives conflicting information for package %v", p.ImportPath) + } + continue + } + + // Determine if this package's error needs to be bubbled up. + // This is a hack, and we expect for go list to eventually set the error + // on the package. + if old.Error != nil { + var errkind string + if strings.Contains(old.Error.Err, "not an importable package") { + errkind = "not an importable package" + } else if strings.Contains(old.Error.Err, "use of internal package") && strings.Contains(old.Error.Err, "not allowed") { + errkind = "use of internal package not allowed" + } + if errkind != "" { + if len(old.Error.ImportStack) < 1 { + return nil, fmt.Errorf(`internal error: go list gave a %q error with empty import stack`, errkind) + } + importingPkg := old.Error.ImportStack[len(old.Error.ImportStack)-1] + if importingPkg == old.ImportPath { + // Using an older version of Go which put this package itself on top of import + // stack, instead of the importer. Look for importer in second from top + // position. + if len(old.Error.ImportStack) < 2 { + return nil, fmt.Errorf(`internal error: go list gave a %q error with an import stack without importing package`, errkind) + } + importingPkg = old.Error.ImportStack[len(old.Error.ImportStack)-2] + } + additionalErrors[importingPkg] = append(additionalErrors[importingPkg], Error{ + Pos: old.Error.Pos, + Msg: old.Error.Err, + Kind: ListError, + }) + } + } + + // Make sure that if there's a version of the package without an error, + // that's the one reported to the user. + if old.Error == nil { + continue + } + + // This package will replace the old one at the end of the loop. + } + seen[p.ImportPath] = p + + pkg := &Package{ + Name: p.Name, + ID: p.ImportPath, + GoFiles: absJoin(p.Dir, p.GoFiles, p.CgoFiles), + CompiledGoFiles: absJoin(p.Dir, p.CompiledGoFiles), + OtherFiles: absJoin(p.Dir, otherFiles(p)...), + EmbedFiles: absJoin(p.Dir, p.EmbedFiles), + EmbedPatterns: absJoin(p.Dir, p.EmbedPatterns), + IgnoredFiles: absJoin(p.Dir, p.IgnoredGoFiles, p.IgnoredOtherFiles), + forTest: p.ForTest, + depsErrors: p.DepsErrors, + Module: p.Module, + } + + if (state.cfg.Mode&typecheckCgo) != 0 && len(p.CgoFiles) != 0 { + if len(p.CompiledGoFiles) > len(p.GoFiles) { + // We need the cgo definitions, which are in the first + // CompiledGoFile after the non-cgo ones. This is a hack but there + // isn't currently a better way to find it. We also need the pure + // Go files and unprocessed cgo files, all of which are already + // in pkg.GoFiles. + cgoTypes := p.CompiledGoFiles[len(p.GoFiles)] + pkg.CompiledGoFiles = append([]string{cgoTypes}, pkg.GoFiles...) + } else { + // golang/go#38990: go list silently fails to do cgo processing + pkg.CompiledGoFiles = nil + pkg.Errors = append(pkg.Errors, Error{ + Msg: "go list failed to return CompiledGoFiles. This may indicate failure to perform cgo processing; try building at the command line. See https://golang.org/issue/38990.", + Kind: ListError, + }) + } + } + + // Work around https://golang.org/issue/28749: + // cmd/go puts assembly, C, and C++ files in CompiledGoFiles. + // Remove files from CompiledGoFiles that are non-go files + // (or are not files that look like they are from the cache). + if len(pkg.CompiledGoFiles) > 0 { + out := pkg.CompiledGoFiles[:0] + for _, f := range pkg.CompiledGoFiles { + if ext := filepath.Ext(f); ext != ".go" && ext != "" { // ext == "" means the file is from the cache, so probably cgo-processed file + continue + } + out = append(out, f) + } + pkg.CompiledGoFiles = out + } + + // Extract the PkgPath from the package's ID. + if i := strings.IndexByte(pkg.ID, ' '); i >= 0 { + pkg.PkgPath = pkg.ID[:i] + } else { + pkg.PkgPath = pkg.ID + } + + if pkg.PkgPath == "unsafe" { + pkg.CompiledGoFiles = nil // ignore fake unsafe.go file (#59929) + } else if len(pkg.CompiledGoFiles) == 0 { + // Work around for pre-go.1.11 versions of go list. + // TODO(matloob): they should be handled by the fallback. + // Can we delete this? + pkg.CompiledGoFiles = pkg.GoFiles + } + + // Assume go list emits only absolute paths for Dir. + if p.Dir != "" && !filepath.IsAbs(p.Dir) { + log.Fatalf("internal error: go list returned non-absolute Package.Dir: %s", p.Dir) + } + + if p.Export != "" && !filepath.IsAbs(p.Export) { + pkg.ExportFile = filepath.Join(p.Dir, p.Export) + } else { + pkg.ExportFile = p.Export + } + + // imports + // + // Imports contains the IDs of all imported packages. + // ImportsMap records (path, ID) only where they differ. + ids := make(map[string]bool) + for _, id := range p.Imports { + ids[id] = true + } + pkg.Imports = make(map[string]*Package) + for path, id := range p.ImportMap { + pkg.Imports[path] = &Package{ID: id} // non-identity import + delete(ids, id) + } + for id := range ids { + if id == "C" { + continue + } + + pkg.Imports[id] = &Package{ID: id} // identity import + } + if !p.DepOnly { + response.Roots = append(response.Roots, pkg.ID) + } + + // Temporary work-around for golang/go#39986. Parse filenames out of + // error messages. This happens if there are unrecoverable syntax + // errors in the source, so we can't match on a specific error message. + // + // TODO(rfindley): remove this heuristic, in favor of considering + // InvalidGoFiles from the list driver. + if err := p.Error; err != nil && state.shouldAddFilenameFromError(p) { + addFilenameFromPos := func(pos string) bool { + split := strings.Split(pos, ":") + if len(split) < 1 { + return false + } + filename := strings.TrimSpace(split[0]) + if filename == "" { + return false + } + if !filepath.IsAbs(filename) { + filename = filepath.Join(state.cfg.Dir, filename) + } + info, _ := os.Stat(filename) + if info == nil { + return false + } + pkg.CompiledGoFiles = append(pkg.CompiledGoFiles, filename) + pkg.GoFiles = append(pkg.GoFiles, filename) + return true + } + found := addFilenameFromPos(err.Pos) + // In some cases, go list only reports the error position in the + // error text, not the error position. One such case is when the + // file's package name is a keyword (see golang.org/issue/39763). + if !found { + addFilenameFromPos(err.Err) + } + } + + if p.Error != nil { + msg := strings.TrimSpace(p.Error.Err) // Trim to work around golang.org/issue/32363. + // Address golang.org/issue/35964 by appending import stack to error message. + if msg == "import cycle not allowed" && len(p.Error.ImportStack) != 0 { + msg += fmt.Sprintf(": import stack: %v", p.Error.ImportStack) + } + pkg.Errors = append(pkg.Errors, Error{ + Pos: p.Error.Pos, + Msg: msg, + Kind: ListError, + }) + } + + pkgs[pkg.ID] = pkg + } + + for id, errs := range additionalErrors { + if p, ok := pkgs[id]; ok { + p.Errors = append(p.Errors, errs...) + } + } + for _, pkg := range pkgs { + response.Packages = append(response.Packages, pkg) + } + sort.Slice(response.Packages, func(i, j int) bool { return response.Packages[i].ID < response.Packages[j].ID }) + + return response, nil +} + +func (state *golistState) shouldAddFilenameFromError(p *jsonPackage) bool { + if len(p.GoFiles) > 0 || len(p.CompiledGoFiles) > 0 { + return false + } + + goV, err := state.getGoVersion() + if err != nil { + return false + } + + // On Go 1.14 and earlier, only add filenames from errors if the import stack is empty. + // The import stack behaves differently for these versions than newer Go versions. + if goV < 15 { + return len(p.Error.ImportStack) == 0 + } + + // On Go 1.15 and later, only parse filenames out of error if there's no import stack, + // or the current package is at the top of the import stack. This is not guaranteed + // to work perfectly, but should avoid some cases where files in errors don't belong to this + // package. + return len(p.Error.ImportStack) == 0 || p.Error.ImportStack[len(p.Error.ImportStack)-1] == p.ImportPath +} + +// getGoVersion returns the effective minor version of the go command. +func (state *golistState) getGoVersion() (int, error) { + state.goVersionOnce.Do(func() { + state.goVersion, state.goVersionError = gocommand.GoVersion(state.ctx, state.cfgInvocation(), state.cfg.gocmdRunner) + }) + return state.goVersion, state.goVersionError +} + +// getPkgPath finds the package path of a directory if it's relative to a root +// directory. +func (state *golistState) getPkgPath(dir string) (string, bool, error) { + absDir, err := filepath.Abs(dir) + if err != nil { + return "", false, err + } + roots, err := state.determineRootDirs() + if err != nil { + return "", false, err + } + + for rdir, rpath := range roots { + // Make sure that the directory is in the module, + // to avoid creating a path relative to another module. + if !strings.HasPrefix(absDir, rdir) { + continue + } + // TODO(matloob): This doesn't properly handle symlinks. + r, err := filepath.Rel(rdir, dir) + if err != nil { + continue + } + if rpath != "" { + // We choose only one root even though the directory even it can belong in multiple modules + // or GOPATH entries. This is okay because we only need to work with absolute dirs when a + // file is missing from disk, for instance when gopls calls go/packages in an overlay. + // Once the file is saved, gopls, or the next invocation of the tool will get the correct + // result straight from golist. + // TODO(matloob): Implement module tiebreaking? + return path.Join(rpath, filepath.ToSlash(r)), true, nil + } + return filepath.ToSlash(r), true, nil + } + return "", false, nil +} + +// absJoin absolutizes and flattens the lists of files. +func absJoin(dir string, fileses ...[]string) (res []string) { + for _, files := range fileses { + for _, file := range files { + if !filepath.IsAbs(file) { + file = filepath.Join(dir, file) + } + res = append(res, file) + } + } + return res +} + +func jsonFlag(cfg *Config, goVersion int) string { + if goVersion < 19 { + return "-json" + } + var fields []string + added := make(map[string]bool) + addFields := func(fs ...string) { + for _, f := range fs { + if !added[f] { + added[f] = true + fields = append(fields, f) + } + } + } + addFields("Name", "ImportPath", "Error") // These fields are always needed + if cfg.Mode&NeedFiles != 0 || cfg.Mode&NeedTypes != 0 { + addFields("Dir", "GoFiles", "IgnoredGoFiles", "IgnoredOtherFiles", "CFiles", + "CgoFiles", "CXXFiles", "MFiles", "HFiles", "FFiles", "SFiles", + "SwigFiles", "SwigCXXFiles", "SysoFiles") + if cfg.Tests { + addFields("TestGoFiles", "XTestGoFiles") + } + } + if cfg.Mode&NeedTypes != 0 { + // CompiledGoFiles seems to be required for the test case TestCgoNoSyntax, + // even when -compiled isn't passed in. + // TODO(#52435): Should we make the test ask for -compiled, or automatically + // request CompiledGoFiles in certain circumstances? + addFields("Dir", "CompiledGoFiles") + } + if cfg.Mode&NeedCompiledGoFiles != 0 { + addFields("Dir", "CompiledGoFiles", "Export") + } + if cfg.Mode&NeedImports != 0 { + // When imports are requested, DepOnly is used to distinguish between packages + // explicitly requested and transitive imports of those packages. + addFields("DepOnly", "Imports", "ImportMap") + if cfg.Tests { + addFields("TestImports", "XTestImports") + } + } + if cfg.Mode&NeedDeps != 0 { + addFields("DepOnly") + } + if usesExportData(cfg) { + // Request Dir in the unlikely case Export is not absolute. + addFields("Dir", "Export") + } + if cfg.Mode&needInternalForTest != 0 { + addFields("ForTest") + } + if cfg.Mode&needInternalDepsErrors != 0 { + addFields("DepsErrors") + } + if cfg.Mode&NeedModule != 0 { + addFields("Module") + } + if cfg.Mode&NeedEmbedFiles != 0 { + addFields("EmbedFiles") + } + if cfg.Mode&NeedEmbedPatterns != 0 { + addFields("EmbedPatterns") + } + return "-json=" + strings.Join(fields, ",") +} + +func golistargs(cfg *Config, words []string, goVersion int) []string { + const findFlags = NeedImports | NeedTypes | NeedSyntax | NeedTypesInfo + fullargs := []string{ + "-e", jsonFlag(cfg, goVersion), + fmt.Sprintf("-compiled=%t", cfg.Mode&(NeedCompiledGoFiles|NeedSyntax|NeedTypes|NeedTypesInfo|NeedTypesSizes) != 0), + fmt.Sprintf("-test=%t", cfg.Tests), + fmt.Sprintf("-export=%t", usesExportData(cfg)), + fmt.Sprintf("-deps=%t", cfg.Mode&NeedImports != 0), + // go list doesn't let you pass -test and -find together, + // probably because you'd just get the TestMain. + fmt.Sprintf("-find=%t", !cfg.Tests && cfg.Mode&findFlags == 0 && !usesExportData(cfg)), + } + + // golang/go#60456: with go1.21 and later, go list serves pgo variants, which + // can be costly to compute and may result in redundant processing for the + // caller. Disable these variants. If someone wants to add e.g. a NeedPGO + // mode flag, that should be a separate proposal. + if goVersion >= 21 { + fullargs = append(fullargs, "-pgo=off") + } + + fullargs = append(fullargs, cfg.BuildFlags...) + fullargs = append(fullargs, "--") + fullargs = append(fullargs, words...) + return fullargs +} + +// cfgInvocation returns an Invocation that reflects cfg's settings. +func (state *golistState) cfgInvocation() gocommand.Invocation { + cfg := state.cfg + return gocommand.Invocation{ + BuildFlags: cfg.BuildFlags, + ModFile: cfg.modFile, + ModFlag: cfg.modFlag, + CleanEnv: cfg.Env != nil, + Env: cfg.Env, + Logf: cfg.Logf, + WorkingDir: cfg.Dir, + Overlay: cfg.goListOverlayFile, + } +} + +// invokeGo returns the stdout of a go command invocation. +func (state *golistState) invokeGo(verb string, args ...string) (*bytes.Buffer, error) { + cfg := state.cfg + + inv := state.cfgInvocation() + inv.Verb = verb + inv.Args = args + gocmdRunner := cfg.gocmdRunner + if gocmdRunner == nil { + gocmdRunner = &gocommand.Runner{} + } + stdout, stderr, friendlyErr, err := gocmdRunner.RunRaw(cfg.Context, inv) + if err != nil { + // Check for 'go' executable not being found. + if ee, ok := err.(*exec.Error); ok && ee.Err == exec.ErrNotFound { + return nil, fmt.Errorf("'go list' driver requires 'go', but %s", exec.ErrNotFound) + } + + exitErr, ok := err.(*exec.ExitError) + if !ok { + // Catastrophic error: + // - context cancellation + return nil, fmt.Errorf("couldn't run 'go': %w", err) + } + + // Old go version? + if strings.Contains(stderr.String(), "flag provided but not defined") { + return nil, goTooOldError{fmt.Errorf("unsupported version of go: %s: %s", exitErr, stderr)} + } + + // Related to #24854 + if len(stderr.String()) > 0 && strings.Contains(stderr.String(), "unexpected directory layout") { + return nil, friendlyErr + } + + // Is there an error running the C compiler in cgo? This will be reported in the "Error" field + // and should be suppressed by go list -e. + // + // This condition is not perfect yet because the error message can include other error messages than runtime/cgo. + isPkgPathRune := func(r rune) bool { + // From https://golang.org/ref/spec#Import_declarations: + // Implementation restriction: A compiler may restrict ImportPaths to non-empty strings + // using only characters belonging to Unicode's L, M, N, P, and S general categories + // (the Graphic characters without spaces) and may also exclude the + // characters !"#$%&'()*,:;<=>?[\]^`{|} and the Unicode replacement character U+FFFD. + return unicode.IsOneOf([]*unicode.RangeTable{unicode.L, unicode.M, unicode.N, unicode.P, unicode.S}, r) && + !strings.ContainsRune("!\"#$%&'()*,:;<=>?[\\]^`{|}\uFFFD", r) + } + // golang/go#36770: Handle case where cmd/go prints module download messages before the error. + msg := stderr.String() + for strings.HasPrefix(msg, "go: downloading") { + msg = msg[strings.IndexRune(msg, '\n')+1:] + } + if len(stderr.String()) > 0 && strings.HasPrefix(stderr.String(), "# ") { + msg := msg[len("# "):] + if strings.HasPrefix(strings.TrimLeftFunc(msg, isPkgPathRune), "\n") { + return stdout, nil + } + // Treat pkg-config errors as a special case (golang.org/issue/36770). + if strings.HasPrefix(msg, "pkg-config") { + return stdout, nil + } + } + + // This error only appears in stderr. See golang.org/cl/166398 for a fix in go list to show + // the error in the Err section of stdout in case -e option is provided. + // This fix is provided for backwards compatibility. + if len(stderr.String()) > 0 && strings.Contains(stderr.String(), "named files must be .go files") { + output := fmt.Sprintf(`{"ImportPath": "command-line-arguments","Incomplete": true,"Error": {"Pos": "","Err": %q}}`, + strings.Trim(stderr.String(), "\n")) + return bytes.NewBufferString(output), nil + } + + // Similar to the previous error, but currently lacks a fix in Go. + if len(stderr.String()) > 0 && strings.Contains(stderr.String(), "named files must all be in one directory") { + output := fmt.Sprintf(`{"ImportPath": "command-line-arguments","Incomplete": true,"Error": {"Pos": "","Err": %q}}`, + strings.Trim(stderr.String(), "\n")) + return bytes.NewBufferString(output), nil + } + + // Backwards compatibility for Go 1.11 because 1.12 and 1.13 put the directory in the ImportPath. + // If the package doesn't exist, put the absolute path of the directory into the error message, + // as Go 1.13 list does. + const noSuchDirectory = "no such directory" + if len(stderr.String()) > 0 && strings.Contains(stderr.String(), noSuchDirectory) { + errstr := stderr.String() + abspath := strings.TrimSpace(errstr[strings.Index(errstr, noSuchDirectory)+len(noSuchDirectory):]) + output := fmt.Sprintf(`{"ImportPath": %q,"Incomplete": true,"Error": {"Pos": "","Err": %q}}`, + abspath, strings.Trim(stderr.String(), "\n")) + return bytes.NewBufferString(output), nil + } + + // Workaround for #29280: go list -e has incorrect behavior when an ad-hoc package doesn't exist. + // Note that the error message we look for in this case is different that the one looked for above. + if len(stderr.String()) > 0 && strings.Contains(stderr.String(), "no such file or directory") { + output := fmt.Sprintf(`{"ImportPath": "command-line-arguments","Incomplete": true,"Error": {"Pos": "","Err": %q}}`, + strings.Trim(stderr.String(), "\n")) + return bytes.NewBufferString(output), nil + } + + // Workaround for #34273. go list -e with GO111MODULE=on has incorrect behavior when listing a + // directory outside any module. + if len(stderr.String()) > 0 && strings.Contains(stderr.String(), "outside available modules") { + output := fmt.Sprintf(`{"ImportPath": %q,"Incomplete": true,"Error": {"Pos": "","Err": %q}}`, + // TODO(matloob): command-line-arguments isn't correct here. + "command-line-arguments", strings.Trim(stderr.String(), "\n")) + return bytes.NewBufferString(output), nil + } + + // Another variation of the previous error + if len(stderr.String()) > 0 && strings.Contains(stderr.String(), "outside module root") { + output := fmt.Sprintf(`{"ImportPath": %q,"Incomplete": true,"Error": {"Pos": "","Err": %q}}`, + // TODO(matloob): command-line-arguments isn't correct here. + "command-line-arguments", strings.Trim(stderr.String(), "\n")) + return bytes.NewBufferString(output), nil + } + + // Workaround for an instance of golang.org/issue/26755: go list -e will return a non-zero exit + // status if there's a dependency on a package that doesn't exist. But it should return + // a zero exit status and set an error on that package. + if len(stderr.String()) > 0 && strings.Contains(stderr.String(), "no Go files in") { + // Don't clobber stdout if `go list` actually returned something. + if len(stdout.String()) > 0 { + return stdout, nil + } + // try to extract package name from string + stderrStr := stderr.String() + var importPath string + colon := strings.Index(stderrStr, ":") + if colon > 0 && strings.HasPrefix(stderrStr, "go build ") { + importPath = stderrStr[len("go build "):colon] + } + output := fmt.Sprintf(`{"ImportPath": %q,"Incomplete": true,"Error": {"Pos": "","Err": %q}}`, + importPath, strings.Trim(stderrStr, "\n")) + return bytes.NewBufferString(output), nil + } + + // Export mode entails a build. + // If that build fails, errors appear on stderr + // (despite the -e flag) and the Export field is blank. + // Do not fail in that case. + // The same is true if an ad-hoc package given to go list doesn't exist. + // TODO(matloob): Remove these once we can depend on go list to exit with a zero status with -e even when + // packages don't exist or a build fails. + if !usesExportData(cfg) && !containsGoFile(args) { + return nil, friendlyErr + } + } + return stdout, nil +} + +func containsGoFile(s []string) bool { + for _, f := range s { + if strings.HasSuffix(f, ".go") { + return true + } + } + return false +} + +func cmdDebugStr(cmd *exec.Cmd) string { + env := make(map[string]string) + for _, kv := range cmd.Env { + split := strings.SplitN(kv, "=", 2) + k, v := split[0], split[1] + env[k] = v + } + + var args []string + for _, arg := range cmd.Args { + quoted := strconv.Quote(arg) + if quoted[1:len(quoted)-1] != arg || strings.Contains(arg, " ") { + args = append(args, quoted) + } else { + args = append(args, arg) + } + } + return fmt.Sprintf("GOROOT=%v GOPATH=%v GO111MODULE=%v GOPROXY=%v PWD=%v %v", env["GOROOT"], env["GOPATH"], env["GO111MODULE"], env["GOPROXY"], env["PWD"], strings.Join(args, " ")) +} + +// getSizesForArgs queries 'go list' for the appropriate +// Compiler and GOARCH arguments to pass to [types.SizesFor]. +func getSizesForArgs(ctx context.Context, inv gocommand.Invocation, gocmdRunner *gocommand.Runner) (string, string, error) { + inv.Verb = "list" + inv.Args = []string{"-f", "{{context.GOARCH}} {{context.Compiler}}", "--", "unsafe"} + stdout, stderr, friendlyErr, rawErr := gocmdRunner.RunRaw(ctx, inv) + var goarch, compiler string + if rawErr != nil { + rawErrMsg := rawErr.Error() + if strings.Contains(rawErrMsg, "cannot find main module") || + strings.Contains(rawErrMsg, "go.mod file not found") { + // User's running outside of a module. + // All bets are off. Get GOARCH and guess compiler is gc. + // TODO(matloob): Is this a problem in practice? + inv.Verb = "env" + inv.Args = []string{"GOARCH"} + envout, enverr := gocmdRunner.Run(ctx, inv) + if enverr != nil { + return "", "", enverr + } + goarch = strings.TrimSpace(envout.String()) + compiler = "gc" + } else if friendlyErr != nil { + return "", "", friendlyErr + } else { + // This should be unreachable, but be defensive + // in case RunRaw's error results are inconsistent. + return "", "", rawErr + } + } else { + fields := strings.Fields(stdout.String()) + if len(fields) < 2 { + return "", "", fmt.Errorf("could not parse GOARCH and Go compiler in format \" \":\nstdout: <<%s>>\nstderr: <<%s>>", + stdout.String(), stderr.String()) + } + goarch = fields[0] + compiler = fields[1] + } + return compiler, goarch, nil +} diff --git a/vendor/golang.org/x/tools/go/packages/golist_overlay.go b/vendor/golang.org/x/tools/go/packages/golist_overlay.go new file mode 100644 index 0000000..d823c47 --- /dev/null +++ b/vendor/golang.org/x/tools/go/packages/golist_overlay.go @@ -0,0 +1,83 @@ +// Copyright 2018 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package packages + +import ( + "encoding/json" + "path/filepath" + + "golang.org/x/tools/internal/gocommand" +) + +// determineRootDirs returns a mapping from absolute directories that could +// contain code to their corresponding import path prefixes. +func (state *golistState) determineRootDirs() (map[string]string, error) { + env, err := state.getEnv() + if err != nil { + return nil, err + } + if env["GOMOD"] != "" { + state.rootsOnce.Do(func() { + state.rootDirs, state.rootDirsError = state.determineRootDirsModules() + }) + } else { + state.rootsOnce.Do(func() { + state.rootDirs, state.rootDirsError = state.determineRootDirsGOPATH() + }) + } + return state.rootDirs, state.rootDirsError +} + +func (state *golistState) determineRootDirsModules() (map[string]string, error) { + // List all of the modules--the first will be the directory for the main + // module. Any replaced modules will also need to be treated as roots. + // Editing files in the module cache isn't a great idea, so we don't + // plan to ever support that. + out, err := state.invokeGo("list", "-m", "-json", "all") + if err != nil { + // 'go list all' will fail if we're outside of a module and + // GO111MODULE=on. Try falling back without 'all'. + var innerErr error + out, innerErr = state.invokeGo("list", "-m", "-json") + if innerErr != nil { + return nil, err + } + } + roots := map[string]string{} + modules := map[string]string{} + var i int + for dec := json.NewDecoder(out); dec.More(); { + mod := new(gocommand.ModuleJSON) + if err := dec.Decode(mod); err != nil { + return nil, err + } + if mod.Dir != "" && mod.Path != "" { + // This is a valid module; add it to the map. + absDir, err := filepath.Abs(mod.Dir) + if err != nil { + return nil, err + } + modules[absDir] = mod.Path + // The first result is the main module. + if i == 0 || mod.Replace != nil && mod.Replace.Path != "" { + roots[absDir] = mod.Path + } + } + i++ + } + return roots, nil +} + +func (state *golistState) determineRootDirsGOPATH() (map[string]string, error) { + m := map[string]string{} + for _, dir := range filepath.SplitList(state.mustGetEnv()["GOPATH"]) { + absDir, err := filepath.Abs(dir) + if err != nil { + return nil, err + } + m[filepath.Join(absDir, "src")] = "" + } + return m, nil +} diff --git a/vendor/golang.org/x/tools/go/packages/loadmode_string.go b/vendor/golang.org/x/tools/go/packages/loadmode_string.go new file mode 100644 index 0000000..5c080d2 --- /dev/null +++ b/vendor/golang.org/x/tools/go/packages/loadmode_string.go @@ -0,0 +1,57 @@ +// Copyright 2019 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package packages + +import ( + "fmt" + "strings" +) + +var allModes = []LoadMode{ + NeedName, + NeedFiles, + NeedCompiledGoFiles, + NeedImports, + NeedDeps, + NeedExportFile, + NeedTypes, + NeedSyntax, + NeedTypesInfo, + NeedTypesSizes, +} + +var modeStrings = []string{ + "NeedName", + "NeedFiles", + "NeedCompiledGoFiles", + "NeedImports", + "NeedDeps", + "NeedExportFile", + "NeedTypes", + "NeedSyntax", + "NeedTypesInfo", + "NeedTypesSizes", +} + +func (mod LoadMode) String() string { + m := mod + if m == 0 { + return "LoadMode(0)" + } + var out []string + for i, x := range allModes { + if x > m { + break + } + if (m & x) != 0 { + out = append(out, modeStrings[i]) + m = m ^ x + } + } + if m != 0 { + out = append(out, "Unknown") + } + return fmt.Sprintf("LoadMode(%s)", strings.Join(out, "|")) +} diff --git a/vendor/golang.org/x/tools/go/packages/packages.go b/vendor/golang.org/x/tools/go/packages/packages.go new file mode 100644 index 0000000..0b6bfaf --- /dev/null +++ b/vendor/golang.org/x/tools/go/packages/packages.go @@ -0,0 +1,1515 @@ +// Copyright 2018 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package packages + +// See doc.go for package documentation and implementation notes. + +import ( + "context" + "encoding/json" + "errors" + "fmt" + "go/ast" + "go/parser" + "go/scanner" + "go/token" + "go/types" + "io" + "log" + "os" + "path/filepath" + "runtime" + "strings" + "sync" + "time" + + "golang.org/x/sync/errgroup" + + "golang.org/x/tools/go/gcexportdata" + "golang.org/x/tools/internal/gocommand" + "golang.org/x/tools/internal/packagesinternal" + "golang.org/x/tools/internal/typesinternal" + "golang.org/x/tools/internal/versions" +) + +// A LoadMode controls the amount of detail to return when loading. +// The bits below can be combined to specify which fields should be +// filled in the result packages. +// +// The zero value is a special case, equivalent to combining +// the NeedName, NeedFiles, and NeedCompiledGoFiles bits. +// +// ID and Errors (if present) will always be filled. +// [Load] may return more information than requested. +// +// Unfortunately there are a number of open bugs related to +// interactions among the LoadMode bits: +// - https://github.com/golang/go/issues/56633 +// - https://github.com/golang/go/issues/56677 +// - https://github.com/golang/go/issues/58726 +// - https://github.com/golang/go/issues/63517 +type LoadMode int + +const ( + // NeedName adds Name and PkgPath. + NeedName LoadMode = 1 << iota + + // NeedFiles adds GoFiles and OtherFiles. + NeedFiles + + // NeedCompiledGoFiles adds CompiledGoFiles. + NeedCompiledGoFiles + + // NeedImports adds Imports. If NeedDeps is not set, the Imports field will contain + // "placeholder" Packages with only the ID set. + NeedImports + + // NeedDeps adds the fields requested by the LoadMode in the packages in Imports. + NeedDeps + + // NeedExportFile adds ExportFile. + NeedExportFile + + // NeedTypes adds Types, Fset, and IllTyped. + NeedTypes + + // NeedSyntax adds Syntax and Fset. + NeedSyntax + + // NeedTypesInfo adds TypesInfo. + NeedTypesInfo + + // NeedTypesSizes adds TypesSizes. + NeedTypesSizes + + // needInternalDepsErrors adds the internal deps errors field for use by gopls. + needInternalDepsErrors + + // needInternalForTest adds the internal forTest field. + // Tests must also be set on the context for this field to be populated. + needInternalForTest + + // typecheckCgo enables full support for type checking cgo. Requires Go 1.15+. + // Modifies CompiledGoFiles and Types, and has no effect on its own. + typecheckCgo + + // NeedModule adds Module. + NeedModule + + // NeedEmbedFiles adds EmbedFiles. + NeedEmbedFiles + + // NeedEmbedPatterns adds EmbedPatterns. + NeedEmbedPatterns +) + +const ( + // Deprecated: LoadFiles exists for historical compatibility + // and should not be used. Please directly specify the needed fields using the Need values. + LoadFiles = NeedName | NeedFiles | NeedCompiledGoFiles + + // Deprecated: LoadImports exists for historical compatibility + // and should not be used. Please directly specify the needed fields using the Need values. + LoadImports = LoadFiles | NeedImports + + // Deprecated: LoadTypes exists for historical compatibility + // and should not be used. Please directly specify the needed fields using the Need values. + LoadTypes = LoadImports | NeedTypes | NeedTypesSizes + + // Deprecated: LoadSyntax exists for historical compatibility + // and should not be used. Please directly specify the needed fields using the Need values. + LoadSyntax = LoadTypes | NeedSyntax | NeedTypesInfo + + // Deprecated: LoadAllSyntax exists for historical compatibility + // and should not be used. Please directly specify the needed fields using the Need values. + LoadAllSyntax = LoadSyntax | NeedDeps + + // Deprecated: NeedExportsFile is a historical misspelling of NeedExportFile. + NeedExportsFile = NeedExportFile +) + +// A Config specifies details about how packages should be loaded. +// The zero value is a valid configuration. +// +// Calls to Load do not modify this struct. +// +// TODO(adonovan): #67702: this is currently false: in fact, +// calls to [Load] do not modify the public fields of this struct, but +// may modify hidden fields, so concurrent calls to [Load] must not +// use the same Config. But perhaps we should reestablish the +// documented invariant. +type Config struct { + // Mode controls the level of information returned for each package. + Mode LoadMode + + // Context specifies the context for the load operation. + // Cancelling the context may cause [Load] to abort and + // return an error. + Context context.Context + + // Logf is the logger for the config. + // If the user provides a logger, debug logging is enabled. + // If the GOPACKAGESDEBUG environment variable is set to true, + // but the logger is nil, default to log.Printf. + Logf func(format string, args ...interface{}) + + // Dir is the directory in which to run the build system's query tool + // that provides information about the packages. + // If Dir is empty, the tool is run in the current directory. + Dir string + + // Env is the environment to use when invoking the build system's query tool. + // If Env is nil, the current environment is used. + // As in os/exec's Cmd, only the last value in the slice for + // each environment key is used. To specify the setting of only + // a few variables, append to the current environment, as in: + // + // opt.Env = append(os.Environ(), "GOOS=plan9", "GOARCH=386") + // + Env []string + + // gocmdRunner guards go command calls from concurrency errors. + gocmdRunner *gocommand.Runner + + // BuildFlags is a list of command-line flags to be passed through to + // the build system's query tool. + BuildFlags []string + + // modFile will be used for -modfile in go command invocations. + modFile string + + // modFlag will be used for -modfile in go command invocations. + modFlag string + + // Fset provides source position information for syntax trees and types. + // If Fset is nil, Load will use a new fileset, but preserve Fset's value. + Fset *token.FileSet + + // ParseFile is called to read and parse each file + // when preparing a package's type-checked syntax tree. + // It must be safe to call ParseFile simultaneously from multiple goroutines. + // If ParseFile is nil, the loader will uses parser.ParseFile. + // + // ParseFile should parse the source from src and use filename only for + // recording position information. + // + // An application may supply a custom implementation of ParseFile + // to change the effective file contents or the behavior of the parser, + // or to modify the syntax tree. For example, selectively eliminating + // unwanted function bodies can significantly accelerate type checking. + ParseFile func(fset *token.FileSet, filename string, src []byte) (*ast.File, error) + + // If Tests is set, the loader includes not just the packages + // matching a particular pattern but also any related test packages, + // including test-only variants of the package and the test executable. + // + // For example, when using the go command, loading "fmt" with Tests=true + // returns four packages, with IDs "fmt" (the standard package), + // "fmt [fmt.test]" (the package as compiled for the test), + // "fmt_test" (the test functions from source files in package fmt_test), + // and "fmt.test" (the test binary). + // + // In build systems with explicit names for tests, + // setting Tests may have no effect. + Tests bool + + // Overlay is a mapping from absolute file paths to file contents. + // + // For each map entry, [Load] uses the alternative file + // contents provided by the overlay mapping instead of reading + // from the file system. This mechanism can be used to enable + // editor-integrated tools to correctly analyze the contents + // of modified but unsaved buffers, for example. + // + // The overlay mapping is passed to the build system's driver + // (see "The driver protocol") so that it too can report + // consistent package metadata about unsaved files. However, + // drivers may vary in their level of support for overlays. + Overlay map[string][]byte + + // goListOverlayFile is the JSON file that encodes the Overlay + // mapping, used by 'go list -overlay=...' + goListOverlayFile string +} + +// Load loads and returns the Go packages named by the given patterns. +// +// Config specifies loading options; +// nil behaves the same as an empty Config. +// +// The [Config.Mode] field is a set of bits that determine what kinds +// of information should be computed and returned. Modes that require +// more information tend to be slower. See [LoadMode] for details +// and important caveats. Its zero value is equivalent to +// NeedName | NeedFiles | NeedCompiledGoFiles. +// +// Each call to Load returns a new set of [Package] instances. +// The Packages and their Imports form a directed acyclic graph. +// +// If the [NeedTypes] mode flag was set, each call to Load uses a new +// [types.Importer], so [types.Object] and [types.Type] values from +// different calls to Load must not be mixed as they will have +// inconsistent notions of type identity. +// +// If any of the patterns was invalid as defined by the +// underlying build system, Load returns an error. +// It may return an empty list of packages without an error, +// for instance for an empty expansion of a valid wildcard. +// Errors associated with a particular package are recorded in the +// corresponding Package's Errors list, and do not cause Load to +// return an error. Clients may need to handle such errors before +// proceeding with further analysis. The PrintErrors function is +// provided for convenient display of all errors. +func Load(cfg *Config, patterns ...string) ([]*Package, error) { + ld := newLoader(cfg) + response, external, err := defaultDriver(&ld.Config, patterns...) + if err != nil { + return nil, err + } + + ld.sizes = types.SizesFor(response.Compiler, response.Arch) + if ld.sizes == nil && ld.Config.Mode&(NeedTypes|NeedTypesSizes|NeedTypesInfo) != 0 { + // Type size information is needed but unavailable. + if external { + // An external driver may fail to populate the Compiler/GOARCH fields, + // especially since they are relatively new (see #63700). + // Provide a sensible fallback in this case. + ld.sizes = types.SizesFor("gc", runtime.GOARCH) + if ld.sizes == nil { // gccgo-only arch + ld.sizes = types.SizesFor("gc", "amd64") + } + } else { + // Go list should never fail to deliver accurate size information. + // Reject the whole Load since the error is the same for every package. + return nil, fmt.Errorf("can't determine type sizes for compiler %q on GOARCH %q", + response.Compiler, response.Arch) + } + } + + return ld.refine(response) +} + +// defaultDriver is a driver that implements go/packages' fallback behavior. +// It will try to request to an external driver, if one exists. If there's +// no external driver, or the driver returns a response with NotHandled set, +// defaultDriver will fall back to the go list driver. +// The boolean result indicates that an external driver handled the request. +func defaultDriver(cfg *Config, patterns ...string) (*DriverResponse, bool, error) { + const ( + // windowsArgMax specifies the maximum command line length for + // the Windows' CreateProcess function. + windowsArgMax = 32767 + // maxEnvSize is a very rough estimation of the maximum environment + // size of a user. + maxEnvSize = 16384 + // safeArgMax specifies the maximum safe command line length to use + // by the underlying driver excl. the environment. We choose the Windows' + // ARG_MAX as the starting point because it's one of the lowest ARG_MAX + // constants out of the different supported platforms, + // e.g., https://www.in-ulm.de/~mascheck/various/argmax/#results. + safeArgMax = windowsArgMax - maxEnvSize + ) + chunks, err := splitIntoChunks(patterns, safeArgMax) + if err != nil { + return nil, false, err + } + + if driver := findExternalDriver(cfg); driver != nil { + response, err := callDriverOnChunks(driver, cfg, chunks) + if err != nil { + return nil, false, err + } else if !response.NotHandled { + return response, true, nil + } + // (fall through) + } + + // go list fallback + // + // Write overlays once, as there are many calls + // to 'go list' (one per chunk plus others too). + overlay, cleanupOverlay, err := gocommand.WriteOverlays(cfg.Overlay) + if err != nil { + return nil, false, err + } + defer cleanupOverlay() + cfg.goListOverlayFile = overlay + + response, err := callDriverOnChunks(goListDriver, cfg, chunks) + if err != nil { + return nil, false, err + } + return response, false, err +} + +// splitIntoChunks chunks the slice so that the total number of characters +// in a chunk is no longer than argMax. +func splitIntoChunks(patterns []string, argMax int) ([][]string, error) { + if argMax <= 0 { + return nil, errors.New("failed to split patterns into chunks, negative safe argMax value") + } + var chunks [][]string + charsInChunk := 0 + nextChunkStart := 0 + for i, v := range patterns { + vChars := len(v) + if vChars > argMax { + // a single pattern is longer than the maximum safe ARG_MAX, hardly should happen + return nil, errors.New("failed to split patterns into chunks, a pattern is too long") + } + charsInChunk += vChars + 1 // +1 is for a whitespace between patterns that has to be counted too + if charsInChunk > argMax { + chunks = append(chunks, patterns[nextChunkStart:i]) + nextChunkStart = i + charsInChunk = vChars + } + } + // add the last chunk + if nextChunkStart < len(patterns) { + chunks = append(chunks, patterns[nextChunkStart:]) + } + return chunks, nil +} + +func callDriverOnChunks(driver driver, cfg *Config, chunks [][]string) (*DriverResponse, error) { + if len(chunks) == 0 { + return driver(cfg) + } + responses := make([]*DriverResponse, len(chunks)) + errNotHandled := errors.New("driver returned NotHandled") + var g errgroup.Group + for i, chunk := range chunks { + i := i + chunk := chunk + g.Go(func() (err error) { + responses[i], err = driver(cfg, chunk...) + if responses[i] != nil && responses[i].NotHandled { + err = errNotHandled + } + return err + }) + } + if err := g.Wait(); err != nil { + if errors.Is(err, errNotHandled) { + return &DriverResponse{NotHandled: true}, nil + } + return nil, err + } + return mergeResponses(responses...), nil +} + +func mergeResponses(responses ...*DriverResponse) *DriverResponse { + if len(responses) == 0 { + return nil + } + response := newDeduper() + response.dr.NotHandled = false + response.dr.Compiler = responses[0].Compiler + response.dr.Arch = responses[0].Arch + response.dr.GoVersion = responses[0].GoVersion + for _, v := range responses { + response.addAll(v) + } + return response.dr +} + +// A Package describes a loaded Go package. +// +// It also defines part of the JSON schema of [DriverResponse]. +// See the package documentation for an overview. +type Package struct { + // ID is a unique identifier for a package, + // in a syntax provided by the underlying build system. + // + // Because the syntax varies based on the build system, + // clients should treat IDs as opaque and not attempt to + // interpret them. + ID string + + // Name is the package name as it appears in the package source code. + Name string + + // PkgPath is the package path as used by the go/types package. + PkgPath string + + // Errors contains any errors encountered querying the metadata + // of the package, or while parsing or type-checking its files. + Errors []Error + + // TypeErrors contains the subset of errors produced during type checking. + TypeErrors []types.Error + + // GoFiles lists the absolute file paths of the package's Go source files. + // It may include files that should not be compiled, for example because + // they contain non-matching build tags, are documentary pseudo-files such as + // unsafe/unsafe.go or builtin/builtin.go, or are subject to cgo preprocessing. + GoFiles []string + + // CompiledGoFiles lists the absolute file paths of the package's source + // files that are suitable for type checking. + // This may differ from GoFiles if files are processed before compilation. + CompiledGoFiles []string + + // OtherFiles lists the absolute file paths of the package's non-Go source files, + // including assembly, C, C++, Fortran, Objective-C, SWIG, and so on. + OtherFiles []string + + // EmbedFiles lists the absolute file paths of the package's files + // embedded with go:embed. + EmbedFiles []string + + // EmbedPatterns lists the absolute file patterns of the package's + // files embedded with go:embed. + EmbedPatterns []string + + // IgnoredFiles lists source files that are not part of the package + // using the current build configuration but that might be part of + // the package using other build configurations. + IgnoredFiles []string + + // ExportFile is the absolute path to a file containing type + // information for the package as provided by the build system. + ExportFile string + + // Imports maps import paths appearing in the package's Go source files + // to corresponding loaded Packages. + Imports map[string]*Package + + // Module is the module information for the package if it exists. + // + // Note: it may be missing for std and cmd; see Go issue #65816. + Module *Module + + // -- The following fields are not part of the driver JSON schema. -- + + // Types provides type information for the package. + // The NeedTypes LoadMode bit sets this field for packages matching the + // patterns; type information for dependencies may be missing or incomplete, + // unless NeedDeps and NeedImports are also set. + // + // Each call to [Load] returns a consistent set of type + // symbols, as defined by the comment at [types.Identical]. + // Avoid mixing type information from two or more calls to [Load]. + Types *types.Package `json:"-"` + + // Fset provides position information for Types, TypesInfo, and Syntax. + // It is set only when Types is set. + Fset *token.FileSet `json:"-"` + + // IllTyped indicates whether the package or any dependency contains errors. + // It is set only when Types is set. + IllTyped bool `json:"-"` + + // Syntax is the package's syntax trees, for the files listed in CompiledGoFiles. + // + // The NeedSyntax LoadMode bit populates this field for packages matching the patterns. + // If NeedDeps and NeedImports are also set, this field will also be populated + // for dependencies. + // + // Syntax is kept in the same order as CompiledGoFiles, with the caveat that nils are + // removed. If parsing returned nil, Syntax may be shorter than CompiledGoFiles. + Syntax []*ast.File `json:"-"` + + // TypesInfo provides type information about the package's syntax trees. + // It is set only when Syntax is set. + TypesInfo *types.Info `json:"-"` + + // TypesSizes provides the effective size function for types in TypesInfo. + TypesSizes types.Sizes `json:"-"` + + // -- internal -- + + // forTest is the package under test, if any. + forTest string + + // depsErrors is the DepsErrors field from the go list response, if any. + depsErrors []*packagesinternal.PackageError +} + +// Module provides module information for a package. +// +// It also defines part of the JSON schema of [DriverResponse]. +// See the package documentation for an overview. +type Module struct { + Path string // module path + Version string // module version + Replace *Module // replaced by this module + Time *time.Time // time version was created + Main bool // is this the main module? + Indirect bool // is this module only an indirect dependency of main module? + Dir string // directory holding files for this module, if any + GoMod string // path to go.mod file used when loading this module, if any + GoVersion string // go version used in module + Error *ModuleError // error loading module +} + +// ModuleError holds errors loading a module. +type ModuleError struct { + Err string // the error itself +} + +func init() { + packagesinternal.GetForTest = func(p interface{}) string { + return p.(*Package).forTest + } + packagesinternal.GetDepsErrors = func(p interface{}) []*packagesinternal.PackageError { + return p.(*Package).depsErrors + } + packagesinternal.SetModFile = func(config interface{}, value string) { + config.(*Config).modFile = value + } + packagesinternal.SetModFlag = func(config interface{}, value string) { + config.(*Config).modFlag = value + } + packagesinternal.TypecheckCgo = int(typecheckCgo) + packagesinternal.DepsErrors = int(needInternalDepsErrors) + packagesinternal.ForTest = int(needInternalForTest) +} + +// An Error describes a problem with a package's metadata, syntax, or types. +type Error struct { + Pos string // "file:line:col" or "file:line" or "" or "-" + Msg string + Kind ErrorKind +} + +// ErrorKind describes the source of the error, allowing the user to +// differentiate between errors generated by the driver, the parser, or the +// type-checker. +type ErrorKind int + +const ( + UnknownError ErrorKind = iota + ListError + ParseError + TypeError +) + +func (err Error) Error() string { + pos := err.Pos + if pos == "" { + pos = "-" // like token.Position{}.String() + } + return pos + ": " + err.Msg +} + +// flatPackage is the JSON form of Package +// It drops all the type and syntax fields, and transforms the Imports +// +// TODO(adonovan): identify this struct with Package, effectively +// publishing the JSON protocol. +type flatPackage struct { + ID string + Name string `json:",omitempty"` + PkgPath string `json:",omitempty"` + Errors []Error `json:",omitempty"` + GoFiles []string `json:",omitempty"` + CompiledGoFiles []string `json:",omitempty"` + OtherFiles []string `json:",omitempty"` + EmbedFiles []string `json:",omitempty"` + EmbedPatterns []string `json:",omitempty"` + IgnoredFiles []string `json:",omitempty"` + ExportFile string `json:",omitempty"` + Imports map[string]string `json:",omitempty"` +} + +// MarshalJSON returns the Package in its JSON form. +// For the most part, the structure fields are written out unmodified, and +// the type and syntax fields are skipped. +// The imports are written out as just a map of path to package id. +// The errors are written using a custom type that tries to preserve the +// structure of error types we know about. +// +// This method exists to enable support for additional build systems. It is +// not intended for use by clients of the API and we may change the format. +func (p *Package) MarshalJSON() ([]byte, error) { + flat := &flatPackage{ + ID: p.ID, + Name: p.Name, + PkgPath: p.PkgPath, + Errors: p.Errors, + GoFiles: p.GoFiles, + CompiledGoFiles: p.CompiledGoFiles, + OtherFiles: p.OtherFiles, + EmbedFiles: p.EmbedFiles, + EmbedPatterns: p.EmbedPatterns, + IgnoredFiles: p.IgnoredFiles, + ExportFile: p.ExportFile, + } + if len(p.Imports) > 0 { + flat.Imports = make(map[string]string, len(p.Imports)) + for path, ipkg := range p.Imports { + flat.Imports[path] = ipkg.ID + } + } + return json.Marshal(flat) +} + +// UnmarshalJSON reads in a Package from its JSON format. +// See MarshalJSON for details about the format accepted. +func (p *Package) UnmarshalJSON(b []byte) error { + flat := &flatPackage{} + if err := json.Unmarshal(b, &flat); err != nil { + return err + } + *p = Package{ + ID: flat.ID, + Name: flat.Name, + PkgPath: flat.PkgPath, + Errors: flat.Errors, + GoFiles: flat.GoFiles, + CompiledGoFiles: flat.CompiledGoFiles, + OtherFiles: flat.OtherFiles, + EmbedFiles: flat.EmbedFiles, + EmbedPatterns: flat.EmbedPatterns, + IgnoredFiles: flat.IgnoredFiles, + ExportFile: flat.ExportFile, + } + if len(flat.Imports) > 0 { + p.Imports = make(map[string]*Package, len(flat.Imports)) + for path, id := range flat.Imports { + p.Imports[path] = &Package{ID: id} + } + } + return nil +} + +func (p *Package) String() string { return p.ID } + +// loaderPackage augments Package with state used during the loading phase +type loaderPackage struct { + *Package + importErrors map[string]error // maps each bad import to its error + loadOnce sync.Once + color uint8 // for cycle detection + needsrc bool // load from source (Mode >= LoadTypes) + needtypes bool // type information is either requested or depended on + initial bool // package was matched by a pattern + goVersion int // minor version number of go command on PATH +} + +// loader holds the working state of a single call to load. +type loader struct { + pkgs map[string]*loaderPackage + Config + sizes types.Sizes // non-nil if needed by mode + parseCache map[string]*parseValue + parseCacheMu sync.Mutex + exportMu sync.Mutex // enforces mutual exclusion of exportdata operations + + // Config.Mode contains the implied mode (see impliedLoadMode). + // Implied mode contains all the fields we need the data for. + // In requestedMode there are the actually requested fields. + // We'll zero them out before returning packages to the user. + // This makes it easier for us to get the conditions where + // we need certain modes right. + requestedMode LoadMode +} + +type parseValue struct { + f *ast.File + err error + ready chan struct{} +} + +func newLoader(cfg *Config) *loader { + ld := &loader{ + parseCache: map[string]*parseValue{}, + } + if cfg != nil { + ld.Config = *cfg + // If the user has provided a logger, use it. + ld.Config.Logf = cfg.Logf + } + if ld.Config.Logf == nil { + // If the GOPACKAGESDEBUG environment variable is set to true, + // but the user has not provided a logger, default to log.Printf. + if debug { + ld.Config.Logf = log.Printf + } else { + ld.Config.Logf = func(format string, args ...interface{}) {} + } + } + if ld.Config.Mode == 0 { + ld.Config.Mode = NeedName | NeedFiles | NeedCompiledGoFiles // Preserve zero behavior of Mode for backwards compatibility. + } + if ld.Config.Env == nil { + ld.Config.Env = os.Environ() + } + if ld.Config.gocmdRunner == nil { + ld.Config.gocmdRunner = &gocommand.Runner{} + } + if ld.Context == nil { + ld.Context = context.Background() + } + if ld.Dir == "" { + if dir, err := os.Getwd(); err == nil { + ld.Dir = dir + } + } + + // Save the actually requested fields. We'll zero them out before returning packages to the user. + ld.requestedMode = ld.Mode + ld.Mode = impliedLoadMode(ld.Mode) + + if ld.Mode&NeedTypes != 0 || ld.Mode&NeedSyntax != 0 { + if ld.Fset == nil { + ld.Fset = token.NewFileSet() + } + + // ParseFile is required even in LoadTypes mode + // because we load source if export data is missing. + if ld.ParseFile == nil { + ld.ParseFile = func(fset *token.FileSet, filename string, src []byte) (*ast.File, error) { + const mode = parser.AllErrors | parser.ParseComments + return parser.ParseFile(fset, filename, src, mode) + } + } + } + + return ld +} + +// refine connects the supplied packages into a graph and then adds type +// and syntax information as requested by the LoadMode. +func (ld *loader) refine(response *DriverResponse) ([]*Package, error) { + roots := response.Roots + rootMap := make(map[string]int, len(roots)) + for i, root := range roots { + rootMap[root] = i + } + ld.pkgs = make(map[string]*loaderPackage) + // first pass, fixup and build the map and roots + var initial = make([]*loaderPackage, len(roots)) + for _, pkg := range response.Packages { + rootIndex := -1 + if i, found := rootMap[pkg.ID]; found { + rootIndex = i + } + + // Overlays can invalidate export data. + // TODO(matloob): make this check fine-grained based on dependencies on overlaid files + exportDataInvalid := len(ld.Overlay) > 0 || pkg.ExportFile == "" && pkg.PkgPath != "unsafe" + // This package needs type information if the caller requested types and the package is + // either a root, or it's a non-root and the user requested dependencies ... + needtypes := (ld.Mode&NeedTypes|NeedTypesInfo != 0 && (rootIndex >= 0 || ld.Mode&NeedDeps != 0)) + // This package needs source if the call requested source (or types info, which implies source) + // and the package is either a root, or itas a non- root and the user requested dependencies... + needsrc := ((ld.Mode&(NeedSyntax|NeedTypesInfo) != 0 && (rootIndex >= 0 || ld.Mode&NeedDeps != 0)) || + // ... or if we need types and the exportData is invalid. We fall back to (incompletely) + // typechecking packages from source if they fail to compile. + (ld.Mode&(NeedTypes|NeedTypesInfo) != 0 && exportDataInvalid)) && pkg.PkgPath != "unsafe" + lpkg := &loaderPackage{ + Package: pkg, + needtypes: needtypes, + needsrc: needsrc, + goVersion: response.GoVersion, + } + ld.pkgs[lpkg.ID] = lpkg + if rootIndex >= 0 { + initial[rootIndex] = lpkg + lpkg.initial = true + } + } + for i, root := range roots { + if initial[i] == nil { + return nil, fmt.Errorf("root package %v is missing", root) + } + } + + if ld.Mode&NeedImports != 0 { + // Materialize the import graph. + + const ( + white = 0 // new + grey = 1 // in progress + black = 2 // complete + ) + + // visit traverses the import graph, depth-first, + // and materializes the graph as Packages.Imports. + // + // Valid imports are saved in the Packages.Import map. + // Invalid imports (cycles and missing nodes) are saved in the importErrors map. + // Thus, even in the presence of both kinds of errors, + // the Import graph remains a DAG. + // + // visit returns whether the package needs src or has a transitive + // dependency on a package that does. These are the only packages + // for which we load source code. + var stack []*loaderPackage + var visit func(lpkg *loaderPackage) bool + visit = func(lpkg *loaderPackage) bool { + switch lpkg.color { + case black: + return lpkg.needsrc + case grey: + panic("internal error: grey node") + } + lpkg.color = grey + stack = append(stack, lpkg) // push + stubs := lpkg.Imports // the structure form has only stubs with the ID in the Imports + lpkg.Imports = make(map[string]*Package, len(stubs)) + for importPath, ipkg := range stubs { + var importErr error + imp := ld.pkgs[ipkg.ID] + if imp == nil { + // (includes package "C" when DisableCgo) + importErr = fmt.Errorf("missing package: %q", ipkg.ID) + } else if imp.color == grey { + importErr = fmt.Errorf("import cycle: %s", stack) + } + if importErr != nil { + if lpkg.importErrors == nil { + lpkg.importErrors = make(map[string]error) + } + lpkg.importErrors[importPath] = importErr + continue + } + + if visit(imp) { + lpkg.needsrc = true + } + lpkg.Imports[importPath] = imp.Package + } + + // Complete type information is required for the + // immediate dependencies of each source package. + if lpkg.needsrc && ld.Mode&NeedTypes != 0 { + for _, ipkg := range lpkg.Imports { + ld.pkgs[ipkg.ID].needtypes = true + } + } + + // NeedTypeSizes causes TypeSizes to be set even + // on packages for which types aren't needed. + if ld.Mode&NeedTypesSizes != 0 { + lpkg.TypesSizes = ld.sizes + } + stack = stack[:len(stack)-1] // pop + lpkg.color = black + + return lpkg.needsrc + } + + // For each initial package, create its import DAG. + for _, lpkg := range initial { + visit(lpkg) + } + + } else { + // !NeedImports: drop the stub (ID-only) import packages + // that we are not even going to try to resolve. + for _, lpkg := range initial { + lpkg.Imports = nil + } + } + + // Load type data and syntax if needed, starting at + // the initial packages (roots of the import DAG). + if ld.Mode&NeedTypes != 0 || ld.Mode&NeedSyntax != 0 { + var wg sync.WaitGroup + for _, lpkg := range initial { + wg.Add(1) + go func(lpkg *loaderPackage) { + ld.loadRecursive(lpkg) + wg.Done() + }(lpkg) + } + wg.Wait() + } + + // If the context is done, return its error and + // throw out [likely] incomplete packages. + if err := ld.Context.Err(); err != nil { + return nil, err + } + + result := make([]*Package, len(initial)) + for i, lpkg := range initial { + result[i] = lpkg.Package + } + for i := range ld.pkgs { + // Clear all unrequested fields, + // to catch programs that use more than they request. + if ld.requestedMode&NeedName == 0 { + ld.pkgs[i].Name = "" + ld.pkgs[i].PkgPath = "" + } + if ld.requestedMode&NeedFiles == 0 { + ld.pkgs[i].GoFiles = nil + ld.pkgs[i].OtherFiles = nil + ld.pkgs[i].IgnoredFiles = nil + } + if ld.requestedMode&NeedEmbedFiles == 0 { + ld.pkgs[i].EmbedFiles = nil + } + if ld.requestedMode&NeedEmbedPatterns == 0 { + ld.pkgs[i].EmbedPatterns = nil + } + if ld.requestedMode&NeedCompiledGoFiles == 0 { + ld.pkgs[i].CompiledGoFiles = nil + } + if ld.requestedMode&NeedImports == 0 { + ld.pkgs[i].Imports = nil + } + if ld.requestedMode&NeedExportFile == 0 { + ld.pkgs[i].ExportFile = "" + } + if ld.requestedMode&NeedTypes == 0 { + ld.pkgs[i].Types = nil + ld.pkgs[i].IllTyped = false + } + if ld.requestedMode&NeedSyntax == 0 { + ld.pkgs[i].Syntax = nil + } + if ld.requestedMode&NeedTypes == 0 && ld.requestedMode&NeedSyntax == 0 { + ld.pkgs[i].Fset = nil + } + if ld.requestedMode&NeedTypesInfo == 0 { + ld.pkgs[i].TypesInfo = nil + } + if ld.requestedMode&NeedTypesSizes == 0 { + ld.pkgs[i].TypesSizes = nil + } + if ld.requestedMode&NeedModule == 0 { + ld.pkgs[i].Module = nil + } + } + + return result, nil +} + +// loadRecursive loads the specified package and its dependencies, +// recursively, in parallel, in topological order. +// It is atomic and idempotent. +// Precondition: ld.Mode&NeedTypes. +func (ld *loader) loadRecursive(lpkg *loaderPackage) { + lpkg.loadOnce.Do(func() { + // Load the direct dependencies, in parallel. + var wg sync.WaitGroup + for _, ipkg := range lpkg.Imports { + imp := ld.pkgs[ipkg.ID] + wg.Add(1) + go func(imp *loaderPackage) { + ld.loadRecursive(imp) + wg.Done() + }(imp) + } + wg.Wait() + ld.loadPackage(lpkg) + }) +} + +// loadPackage loads the specified package. +// It must be called only once per Package, +// after immediate dependencies are loaded. +// Precondition: ld.Mode & NeedTypes. +func (ld *loader) loadPackage(lpkg *loaderPackage) { + if lpkg.PkgPath == "unsafe" { + // Fill in the blanks to avoid surprises. + lpkg.Types = types.Unsafe + lpkg.Fset = ld.Fset + lpkg.Syntax = []*ast.File{} + lpkg.TypesInfo = new(types.Info) + lpkg.TypesSizes = ld.sizes + return + } + + // Call NewPackage directly with explicit name. + // This avoids skew between golist and go/types when the files' + // package declarations are inconsistent. + lpkg.Types = types.NewPackage(lpkg.PkgPath, lpkg.Name) + lpkg.Fset = ld.Fset + + // Start shutting down if the context is done and do not load + // source or export data files. + // Packages that import this one will have ld.Context.Err() != nil. + // ld.Context.Err() will be returned later by refine. + if ld.Context.Err() != nil { + return + } + + // Subtle: we populate all Types fields with an empty Package + // before loading export data so that export data processing + // never has to create a types.Package for an indirect dependency, + // which would then require that such created packages be explicitly + // inserted back into the Import graph as a final step after export data loading. + // (Hence this return is after the Types assignment.) + // The Diamond test exercises this case. + if !lpkg.needtypes && !lpkg.needsrc { + return + } + if !lpkg.needsrc { + if err := ld.loadFromExportData(lpkg); err != nil { + lpkg.Errors = append(lpkg.Errors, Error{ + Pos: "-", + Msg: err.Error(), + Kind: UnknownError, // e.g. can't find/open/parse export data + }) + } + return // not a source package, don't get syntax trees + } + + appendError := func(err error) { + // Convert various error types into the one true Error. + var errs []Error + switch err := err.(type) { + case Error: + // from driver + errs = append(errs, err) + + case *os.PathError: + // from parser + errs = append(errs, Error{ + Pos: err.Path + ":1", + Msg: err.Err.Error(), + Kind: ParseError, + }) + + case scanner.ErrorList: + // from parser + for _, err := range err { + errs = append(errs, Error{ + Pos: err.Pos.String(), + Msg: err.Msg, + Kind: ParseError, + }) + } + + case types.Error: + // from type checker + lpkg.TypeErrors = append(lpkg.TypeErrors, err) + errs = append(errs, Error{ + Pos: err.Fset.Position(err.Pos).String(), + Msg: err.Msg, + Kind: TypeError, + }) + + default: + // unexpected impoverished error from parser? + errs = append(errs, Error{ + Pos: "-", + Msg: err.Error(), + Kind: UnknownError, + }) + + // If you see this error message, please file a bug. + log.Printf("internal error: error %q (%T) without position", err, err) + } + + lpkg.Errors = append(lpkg.Errors, errs...) + } + + // If the go command on the PATH is newer than the runtime, + // then the go/{scanner,ast,parser,types} packages from the + // standard library may be unable to process the files + // selected by go list. + // + // There is currently no way to downgrade the effective + // version of the go command (see issue 52078), so we proceed + // with the newer go command but, in case of parse or type + // errors, we emit an additional diagnostic. + // + // See: + // - golang.org/issue/52078 (flag to set release tags) + // - golang.org/issue/50825 (gopls legacy version support) + // - golang.org/issue/55883 (go/packages confusing error) + // + // Should we assert a hard minimum of (currently) go1.16 here? + var runtimeVersion int + if _, err := fmt.Sscanf(runtime.Version(), "go1.%d", &runtimeVersion); err == nil && runtimeVersion < lpkg.goVersion { + defer func() { + if len(lpkg.Errors) > 0 { + appendError(Error{ + Pos: "-", + Msg: fmt.Sprintf("This application uses version go1.%d of the source-processing packages but runs version go1.%d of 'go list'. It may fail to process source files that rely on newer language features. If so, rebuild the application using a newer version of Go.", runtimeVersion, lpkg.goVersion), + Kind: UnknownError, + }) + } + }() + } + + if ld.Config.Mode&NeedTypes != 0 && len(lpkg.CompiledGoFiles) == 0 && lpkg.ExportFile != "" { + // The config requested loading sources and types, but sources are missing. + // Add an error to the package and fall back to loading from export data. + appendError(Error{"-", fmt.Sprintf("sources missing for package %s", lpkg.ID), ParseError}) + _ = ld.loadFromExportData(lpkg) // ignore any secondary errors + + return // can't get syntax trees for this package + } + + files, errs := ld.parseFiles(lpkg.CompiledGoFiles) + for _, err := range errs { + appendError(err) + } + + lpkg.Syntax = files + if ld.Config.Mode&NeedTypes == 0 { + return + } + + // Start shutting down if the context is done and do not type check. + // Packages that import this one will have ld.Context.Err() != nil. + // ld.Context.Err() will be returned later by refine. + if ld.Context.Err() != nil { + return + } + + lpkg.TypesInfo = &types.Info{ + Types: make(map[ast.Expr]types.TypeAndValue), + Defs: make(map[*ast.Ident]types.Object), + Uses: make(map[*ast.Ident]types.Object), + Implicits: make(map[ast.Node]types.Object), + Instances: make(map[*ast.Ident]types.Instance), + Scopes: make(map[ast.Node]*types.Scope), + Selections: make(map[*ast.SelectorExpr]*types.Selection), + } + versions.InitFileVersions(lpkg.TypesInfo) + lpkg.TypesSizes = ld.sizes + + importer := importerFunc(func(path string) (*types.Package, error) { + if path == "unsafe" { + return types.Unsafe, nil + } + + // The imports map is keyed by import path. + ipkg := lpkg.Imports[path] + if ipkg == nil { + if err := lpkg.importErrors[path]; err != nil { + return nil, err + } + // There was skew between the metadata and the + // import declarations, likely due to an edit + // race, or because the ParseFile feature was + // used to supply alternative file contents. + return nil, fmt.Errorf("no metadata for %s", path) + } + + if ipkg.Types != nil && ipkg.Types.Complete() { + return ipkg.Types, nil + } + log.Fatalf("internal error: package %q without types was imported from %q", path, lpkg) + panic("unreachable") + }) + + // type-check + tc := &types.Config{ + Importer: importer, + + // Type-check bodies of functions only in initial packages. + // Example: for import graph A->B->C and initial packages {A,C}, + // we can ignore function bodies in B. + IgnoreFuncBodies: ld.Mode&NeedDeps == 0 && !lpkg.initial, + + Error: appendError, + Sizes: ld.sizes, // may be nil + } + if lpkg.Module != nil && lpkg.Module.GoVersion != "" { + tc.GoVersion = "go" + lpkg.Module.GoVersion + } + if (ld.Mode & typecheckCgo) != 0 { + if !typesinternal.SetUsesCgo(tc) { + appendError(Error{ + Msg: "typecheckCgo requires Go 1.15+", + Kind: ListError, + }) + return + } + } + + typErr := types.NewChecker(tc, ld.Fset, lpkg.Types, lpkg.TypesInfo).Files(lpkg.Syntax) + lpkg.importErrors = nil // no longer needed + + // In go/types go1.21 and go1.22, Checker.Files failed fast with a + // a "too new" error, without calling tc.Error and without + // proceeding to type-check the package (#66525). + // We rely on the runtimeVersion error to give the suggested remedy. + if typErr != nil && len(lpkg.Errors) == 0 && len(lpkg.Syntax) > 0 { + if msg := typErr.Error(); strings.HasPrefix(msg, "package requires newer Go version") { + appendError(types.Error{ + Fset: ld.Fset, + Pos: lpkg.Syntax[0].Package, + Msg: msg, + }) + } + } + + // If !Cgo, the type-checker uses FakeImportC mode, so + // it doesn't invoke the importer for import "C", + // nor report an error for the import, + // or for any undefined C.f reference. + // We must detect this explicitly and correctly + // mark the package as IllTyped (by reporting an error). + // TODO(adonovan): if these errors are annoying, + // we could just set IllTyped quietly. + if tc.FakeImportC { + outer: + for _, f := range lpkg.Syntax { + for _, imp := range f.Imports { + if imp.Path.Value == `"C"` { + err := types.Error{Fset: ld.Fset, Pos: imp.Pos(), Msg: `import "C" ignored`} + appendError(err) + break outer + } + } + } + } + + // If types.Checker.Files had an error that was unreported, + // make sure to report the unknown error so the package is illTyped. + if typErr != nil && len(lpkg.Errors) == 0 { + appendError(typErr) + } + + // Record accumulated errors. + illTyped := len(lpkg.Errors) > 0 + if !illTyped { + for _, imp := range lpkg.Imports { + if imp.IllTyped { + illTyped = true + break + } + } + } + lpkg.IllTyped = illTyped +} + +// An importFunc is an implementation of the single-method +// types.Importer interface based on a function value. +type importerFunc func(path string) (*types.Package, error) + +func (f importerFunc) Import(path string) (*types.Package, error) { return f(path) } + +// We use a counting semaphore to limit +// the number of parallel I/O calls per process. +var ioLimit = make(chan bool, 20) + +func (ld *loader) parseFile(filename string) (*ast.File, error) { + ld.parseCacheMu.Lock() + v, ok := ld.parseCache[filename] + if ok { + // cache hit + ld.parseCacheMu.Unlock() + <-v.ready + } else { + // cache miss + v = &parseValue{ready: make(chan struct{})} + ld.parseCache[filename] = v + ld.parseCacheMu.Unlock() + + var src []byte + for f, contents := range ld.Config.Overlay { + if sameFile(f, filename) { + src = contents + } + } + var err error + if src == nil { + ioLimit <- true // wait + src, err = os.ReadFile(filename) + <-ioLimit // signal + } + if err != nil { + v.err = err + } else { + v.f, v.err = ld.ParseFile(ld.Fset, filename, src) + } + + close(v.ready) + } + return v.f, v.err +} + +// parseFiles reads and parses the Go source files and returns the ASTs +// of the ones that could be at least partially parsed, along with a +// list of I/O and parse errors encountered. +// +// Because files are scanned in parallel, the token.Pos +// positions of the resulting ast.Files are not ordered. +func (ld *loader) parseFiles(filenames []string) ([]*ast.File, []error) { + var wg sync.WaitGroup + n := len(filenames) + parsed := make([]*ast.File, n) + errors := make([]error, n) + for i, file := range filenames { + wg.Add(1) + go func(i int, filename string) { + parsed[i], errors[i] = ld.parseFile(filename) + wg.Done() + }(i, file) + } + wg.Wait() + + // Eliminate nils, preserving order. + var o int + for _, f := range parsed { + if f != nil { + parsed[o] = f + o++ + } + } + parsed = parsed[:o] + + o = 0 + for _, err := range errors { + if err != nil { + errors[o] = err + o++ + } + } + errors = errors[:o] + + return parsed, errors +} + +// sameFile returns true if x and y have the same basename and denote +// the same file. +func sameFile(x, y string) bool { + if x == y { + // It could be the case that y doesn't exist. + // For instance, it may be an overlay file that + // hasn't been written to disk. To handle that case + // let x == y through. (We added the exact absolute path + // string to the CompiledGoFiles list, so the unwritten + // overlay case implies x==y.) + return true + } + if strings.EqualFold(filepath.Base(x), filepath.Base(y)) { // (optimisation) + if xi, err := os.Stat(x); err == nil { + if yi, err := os.Stat(y); err == nil { + return os.SameFile(xi, yi) + } + } + } + return false +} + +// loadFromExportData ensures that type information is present for the specified +// package, loading it from an export data file on the first request. +// On success it sets lpkg.Types to a new Package. +func (ld *loader) loadFromExportData(lpkg *loaderPackage) error { + if lpkg.PkgPath == "" { + log.Fatalf("internal error: Package %s has no PkgPath", lpkg) + } + + // Because gcexportdata.Read has the potential to create or + // modify the types.Package for each node in the transitive + // closure of dependencies of lpkg, all exportdata operations + // must be sequential. (Finer-grained locking would require + // changes to the gcexportdata API.) + // + // The exportMu lock guards the lpkg.Types field and the + // types.Package it points to, for each loaderPackage in the graph. + // + // Not all accesses to Package.Pkg need to be protected by exportMu: + // graph ordering ensures that direct dependencies of source + // packages are fully loaded before the importer reads their Pkg field. + ld.exportMu.Lock() + defer ld.exportMu.Unlock() + + if tpkg := lpkg.Types; tpkg != nil && tpkg.Complete() { + return nil // cache hit + } + + lpkg.IllTyped = true // fail safe + + if lpkg.ExportFile == "" { + // Errors while building export data will have been printed to stderr. + return fmt.Errorf("no export data file") + } + f, err := os.Open(lpkg.ExportFile) + if err != nil { + return err + } + defer f.Close() + + // Read gc export data. + // + // We don't currently support gccgo export data because all + // underlying workspaces use the gc toolchain. (Even build + // systems that support gccgo don't use it for workspace + // queries.) + r, err := gcexportdata.NewReader(f) + if err != nil { + return fmt.Errorf("reading %s: %v", lpkg.ExportFile, err) + } + + // Build the view. + // + // The gcexportdata machinery has no concept of package ID. + // It identifies packages by their PkgPath, which although not + // globally unique is unique within the scope of one invocation + // of the linker, type-checker, or gcexportdata. + // + // So, we must build a PkgPath-keyed view of the global + // (conceptually ID-keyed) cache of packages and pass it to + // gcexportdata. The view must contain every existing + // package that might possibly be mentioned by the + // current package---its transitive closure. + // + // In loadPackage, we unconditionally create a types.Package for + // each dependency so that export data loading does not + // create new ones. + // + // TODO(adonovan): it would be simpler and more efficient + // if the export data machinery invoked a callback to + // get-or-create a package instead of a map. + // + view := make(map[string]*types.Package) // view seen by gcexportdata + seen := make(map[*loaderPackage]bool) // all visited packages + var visit func(pkgs map[string]*Package) + visit = func(pkgs map[string]*Package) { + for _, p := range pkgs { + lpkg := ld.pkgs[p.ID] + if !seen[lpkg] { + seen[lpkg] = true + view[lpkg.PkgPath] = lpkg.Types + visit(lpkg.Imports) + } + } + } + visit(lpkg.Imports) + + viewLen := len(view) + 1 // adding the self package + // Parse the export data. + // (May modify incomplete packages in view but not create new ones.) + tpkg, err := gcexportdata.Read(r, ld.Fset, view, lpkg.PkgPath) + if err != nil { + return fmt.Errorf("reading %s: %v", lpkg.ExportFile, err) + } + if _, ok := view["go.shape"]; ok { + // Account for the pseudopackage "go.shape" that gets + // created by generic code. + viewLen++ + } + if viewLen != len(view) { + log.Panicf("golang.org/x/tools/go/packages: unexpected new packages during load of %s", lpkg.PkgPath) + } + + lpkg.Types = tpkg + lpkg.IllTyped = false + return nil +} + +// impliedLoadMode returns loadMode with its dependencies. +func impliedLoadMode(loadMode LoadMode) LoadMode { + if loadMode&(NeedDeps|NeedTypes|NeedTypesInfo) != 0 { + // All these things require knowing the import graph. + loadMode |= NeedImports + } + if loadMode&NeedTypes != 0 { + // Types require the GoVersion from Module. + loadMode |= NeedModule + } + + return loadMode +} + +func usesExportData(cfg *Config) bool { + return cfg.Mode&NeedExportFile != 0 || cfg.Mode&NeedTypes != 0 && cfg.Mode&NeedDeps == 0 +} + +var _ interface{} = io.Discard // assert build toolchain is go1.16 or later diff --git a/vendor/golang.org/x/tools/go/packages/visit.go b/vendor/golang.org/x/tools/go/packages/visit.go new file mode 100644 index 0000000..df14ffd --- /dev/null +++ b/vendor/golang.org/x/tools/go/packages/visit.go @@ -0,0 +1,68 @@ +// Copyright 2018 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package packages + +import ( + "fmt" + "os" + "sort" +) + +// Visit visits all the packages in the import graph whose roots are +// pkgs, calling the optional pre function the first time each package +// is encountered (preorder), and the optional post function after a +// package's dependencies have been visited (postorder). +// The boolean result of pre(pkg) determines whether +// the imports of package pkg are visited. +func Visit(pkgs []*Package, pre func(*Package) bool, post func(*Package)) { + seen := make(map[*Package]bool) + var visit func(*Package) + visit = func(pkg *Package) { + if !seen[pkg] { + seen[pkg] = true + + if pre == nil || pre(pkg) { + paths := make([]string, 0, len(pkg.Imports)) + for path := range pkg.Imports { + paths = append(paths, path) + } + sort.Strings(paths) // Imports is a map, this makes visit stable + for _, path := range paths { + visit(pkg.Imports[path]) + } + } + + if post != nil { + post(pkg) + } + } + } + for _, pkg := range pkgs { + visit(pkg) + } +} + +// PrintErrors prints to os.Stderr the accumulated errors of all +// packages in the import graph rooted at pkgs, dependencies first. +// PrintErrors returns the number of errors printed. +func PrintErrors(pkgs []*Package) int { + var n int + errModules := make(map[*Module]bool) + Visit(pkgs, nil, func(pkg *Package) { + for _, err := range pkg.Errors { + fmt.Fprintln(os.Stderr, err) + n++ + } + + // Print pkg.Module.Error once if present. + mod := pkg.Module + if mod != nil && mod.Error != nil && !errModules[mod] { + errModules[mod] = true + fmt.Fprintln(os.Stderr, mod.Error.Err) + n++ + } + }) + return n +} -- cgit v1.2.3