analysis

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Version: v0.1.11 Latest Latest
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Published: Jun 9, 2022 License: BSD-3-Clause Imports: 3 Imported by: 68

Documentation

Overview

Package analysis performs type and pointer analysis and generates mark-up for the Go source view.

The Run method populates a Result object by running type and (optionally) pointer analysis. The Result object is thread-safe and at all times may be accessed by a serving thread, even as it is progressively populated as analysis facts are derived.

The Result is a mapping from each godoc file URL (e.g. /src/fmt/print.go) to information about that file. The information is a list of HTML markup links and a JSON array of structured data values. Some of the links call client-side JavaScript functions that index this array.

The analysis computes mark-up for the following relations:

IMPORTS: for each ast.ImportSpec, the package that it denotes.

RESOLUTION: for each ast.Ident, its kind and type, and the location of its definition.

METHOD SETS, IMPLEMENTS: for each ast.Ident defining a named type, its method-set, the set of interfaces it implements or is implemented by, and its size/align values.

CALLERS, CALLEES: for each function declaration ('func' token), its callers, and for each call-site ('(' token), its callees.

CALLGRAPH: the package docs include an interactive viewer for the intra-package call graph of "fmt".

CHANNEL PEERS: for each channel operation make/<-/close, the set of other channel ops that alias the same channel(s).

ERRORS: for each locus of a frontend (scanner/parser/type) error, the location is highlighted in red and hover text provides the compiler error message.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type FileInfo

type FileInfo struct {
	Data  []interface{} // JSON serializable values
	Links []Link        // HTML link markup
}

FileInfo holds analysis information for the source file view. Clients must not mutate it.

type Link interface {
	Start() int
	End() int
	Write(w io.Writer, _ int, start bool) // the godoc.LinkWriter signature
}

A Link is an HTML decoration of the bytes [Start, End) of a file. Write is called before/after those bytes to emit the mark-up.

type PCGNodeJSON

type PCGNodeJSON struct {
	Func    anchorJSON
	Callees []int // indices within CALLGRAPH of nodes called by this one
}

JavaScript's cgAddChild requires a global array of PCGNodeJSON called CALLGRAPH, representing the intra-package call graph. The first element is special and represents "all external callers".

type PackageInfo

type PackageInfo struct {
	CallGraph      []*PCGNodeJSON
	CallGraphIndex map[string]int
	Types          []*TypeInfoJSON
}

PackageInfo holds analysis information for the package view. Clients must not mutate it.

type Result

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

Result contains the results of analysis. The result contains a mapping from filenames to a set of HTML links and JavaScript data referenced by the links.

func (*Result) FileInfo

func (res *Result) FileInfo(url string) (fi FileInfo)

FileInfo returns new slices containing opaque JSON values and the HTML link markup for the specified godoc file URL. Thread-safe. Callers must not mutate the elements. It returns "zero" if no data is available.

func (*Result) PackageInfo

func (res *Result) PackageInfo(importPath string) PackageInfo

PackageInfo returns new slices of JSON values for the callgraph and type info for the specified package. Thread-safe. Callers must not mutate its fields. PackageInfo returns "zero" if no data is available.

func (*Result) Status

func (res *Result) Status() string

Status returns a human-readable description of the current analysis status.

type TypeInfoJSON

type TypeInfoJSON struct {
	Name        string // type name
	Size, Align int64
	Methods     []anchorJSON
	ImplGroups  []implGroupJSON
}

JavaScript's onClickIdent() expects a TypeInfoJSON.

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