Documentation

Overview

Package serial defines the guru's schema for -json output.

The output of a guru query is a stream of one or more JSON objects. This table shows the types of objects in the result stream for each query type.

Query      Result stream
-----      -------------
callees    Callees
callers    Caller ...
callstack  CallStack
definition Definition
describe   Describe
freevars   FreeVar ...
implements Implements
peers      Peers
pointsto   PointsTo ...
referrers  ReferrersInitial ReferrersPackage ...
what       What
whicherrs  WhichErrs

All 'pos' strings in the output are of the form "file:line:col", where line is the 1-based line number and col is the 1-based byte index.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type CallStack

type CallStack struct {
	Pos     string   `json:"pos"`     // location of the selected function
	Target  string   `json:"target"`  // the selected function
	Callers []Caller `json:"callers"` // enclosing calls, innermost first.
}

A CallStack is the result of a 'callstack' query. It indicates an arbitrary path from the root of the callgraph to the query function.

If the Callers slice is empty, the function was unreachable in this analysis scope.

type Callee

type Callee struct {
	Name string `json:"name"` // full name of called function
	Pos  string `json:"pos"`  // location of called function
}

A Callees is the result of a 'callees' query.

Callees is nonempty unless the call was a dynamic call on a provably nil func or interface value.

type Callees

type Callees struct {
	Pos     string    `json:"pos"`  // location of selected call site
	Desc    string    `json:"desc"` // description of call site
	Callees []*Callee `json:"callees"`
}

A Callees is the result of a 'callees' query.

Callees is nonempty unless the call was a dynamic call on a provably nil func or interface value.

type Caller

type Caller struct {
	Pos    string `json:"pos,omitempty"` // location of the calling function
	Desc   string `json:"desc"`          // description of call site
	Caller string `json:"caller"`        // full name of calling function
}

A Caller is one element of the slice returned by a 'callers' query. (Callstack also contains a similar slice.)

The root of the callgraph has an unspecified "Caller" string.

type Definition

type Definition struct {
	ObjPos string `json:"objpos,omitempty"` // location of the definition
	Desc   string `json:"desc"`             // description of the denoted object
}

A Definition is the result of a 'definition' query.

type Describe

type Describe struct {
	Desc   string `json:"desc"`             // description of the selected syntax node
	Pos    string `json:"pos"`              // location of the selected syntax node
	Detail string `json:"detail,omitempty"` // one of {package, type, value}, or "".

	// At most one of the following fields is populated:
	// the one specified by 'detail'.
	Package *DescribePackage `json:"package,omitempty"`
	Type    *DescribeType    `json:"type,omitempty"`
	Value   *DescribeValue   `json:"value,omitempty"`
}

A Describe is the result of a 'describe' query. It may contain an element describing the selected semantic entity in detail.

type DescribeMember

type DescribeMember struct {
	Name    string           `json:"name"`              // name of member
	Type    string           `json:"type,omitempty"`    // type of member (underlying, if 'type')
	Value   string           `json:"value,omitempty"`   // value of member (if 'const')
	Pos     string           `json:"pos"`               // location of definition of member
	Kind    string           `json:"kind"`              // one of {var,const,func,type}
	Methods []DescribeMethod `json:"methods,omitempty"` // methods (if member is a type)
}

type DescribeMethod

type DescribeMethod struct {
	Name string `json:"name"` // method name, as defined by types.Selection.String()
	Pos  string `json:"pos"`  // location of the method's definition
}

type DescribePackage

type DescribePackage struct {
	Path    string            `json:"path"`              // import path of the package
	Members []*DescribeMember `json:"members,omitempty"` // accessible members of the package
}

A DescribePackage is the additional result of a 'describe' if the selection indicates a package.

type DescribeType

type DescribeType struct {
	Type    string           `json:"type"`              // the string form of the type
	NamePos string           `json:"namepos,omitempty"` // location of definition of type, if named
	NameDef string           `json:"namedef,omitempty"` // underlying definition of type, if named
	Methods []DescribeMethod `json:"methods,omitempty"` // methods of the type
}

A DescribeType is the additional result of a 'describe' query if the selection indicates a type.

type DescribeValue

type DescribeValue struct {
	Type     string       `json:"type"`               // type of the expression
	Value    string       `json:"value,omitempty"`    // value of the expression, if constant
	ObjPos   string       `json:"objpos,omitempty"`   // location of the definition, if an Ident
	TypesPos []Definition `json:"typespos,omitempty"` // location of the named types, that type consist of
}

A DescribeValue is the additional result of a 'describe' query if the selection indicates a value or expression.

type FreeVar

type FreeVar struct {
	Pos  string `json:"pos"`  // location of the identifier's definition
	Kind string `json:"kind"` // one of {var,func,type,const,label}
	Ref  string `json:"ref"`  // referring expression (e.g. "x" or "x.y.z")
	Type string `json:"type"` // type of the expression
}

A FreeVar is one element of the slice returned by a 'freevars' query. Each one identifies an expression referencing a local identifier defined outside the selected region.

type Implements

type Implements struct {
	T                 ImplementsType   `json:"type,omitempty"`    // the queried type
	AssignableTo      []ImplementsType `json:"to,omitempty"`      // types assignable to T
	AssignableFrom    []ImplementsType `json:"from,omitempty"`    // interface types assignable from T
	AssignableFromPtr []ImplementsType `json:"fromptr,omitempty"` // interface types assignable only from *T

	// The following fields are set only if the query was a method.
	// Assignable{To,From,FromPtr}Method[i] is the corresponding
	// method of type Assignable{To,From,FromPtr}[i], or blank
	// {"",""} if that type lacks the method.
	Method                  *DescribeMethod  `json:"method,omitempty"` //  the queried method
	AssignableToMethod      []DescribeMethod `json:"to_method,omitempty"`
	AssignableFromMethod    []DescribeMethod `json:"from_method,omitempty"`
	AssignableFromPtrMethod []DescribeMethod `json:"fromptr_method,omitempty"`
}

An Implements contains the result of an 'implements' query. It describes the queried type, the set of named non-empty interface types to which it is assignable, and the set of named/*named types (concrete or non-empty interface) which may be assigned to it.

type ImplementsType

type ImplementsType struct {
	Name string `json:"name"` // full name of the type
	Pos  string `json:"pos"`  // location of its definition
	Kind string `json:"kind"` // "basic", "array", etc
}

An ImplementsType describes a single type as part of an 'implements' query.

type Peers

type Peers struct {
	Pos      string   `json:"pos"`                // location of the selected channel op (<-)
	Type     string   `json:"type"`               // type of the selected channel
	Allocs   []string `json:"allocs,omitempty"`   // locations of aliased make(chan) ops
	Sends    []string `json:"sends,omitempty"`    // locations of aliased ch<-x ops
	Receives []string `json:"receives,omitempty"` // locations of aliased <-ch ops
	Closes   []string `json:"closes,omitempty"`   // locations of aliased close(ch) ops
}

A Peers is the result of a 'peers' query. If Allocs is empty, the selected channel can't point to anything.

type PointsTo

type PointsTo struct {
	Type    string          `json:"type"`              // (concrete) type of the pointer
	NamePos string          `json:"namepos,omitempty"` // location of type defn, if Named
	Labels  []PointsToLabel `json:"labels,omitempty"`  // pointed-to objects
}

A PointsTo is one element of the result of a 'pointsto' query on an expression. It describes a single pointer: its type and the set of "labels" it points to.

If the pointer is of interface type, it will have one PTS entry describing each concrete type that it may contain. For each concrete type that is a pointer, the PTS entry describes the labels it may point to. The same is true for reflect.Values, except the dynamic types needn't be concrete.

type PointsToLabel

type PointsToLabel struct {
	Pos  string `json:"pos"`  // location of syntax that allocated the object
	Desc string `json:"desc"` // description of the label
}

A PointsToLabel describes a pointer analysis label.

A "label" is an object that may be pointed to by a pointer, map, channel, 'func', slice or interface. Labels include:

- functions
- globals
- arrays created by literals (e.g. []byte("foo")) and conversions ([]byte(s))
- stack- and heap-allocated variables (including composite literals)
- arrays allocated by append()
- channels, maps and arrays created by make()
- and their subelements, e.g. "alloc.y[*].z"

type Ref

type Ref struct {
	Pos  string `json:"pos"`  // location of all references
	Text string `json:"text"` // text of the referring line
}

A "referrers" query emits a ReferrersInitial object followed by zero or more ReferrersPackage objects, one per package that contains a reference.

type ReferrersInitial

type ReferrersInitial struct {
	ObjPos string `json:"objpos,omitempty"` // location of the definition
	Desc   string `json:"desc"`             // description of the denoted object
}

A "referrers" query emits a ReferrersInitial object followed by zero or more ReferrersPackage objects, one per package that contains a reference.

type ReferrersPackage

type ReferrersPackage struct {
	Package string `json:"package"`
	Refs    []Ref  `json:"refs"` // non-empty list of references within this package
}

A "referrers" query emits a ReferrersInitial object followed by zero or more ReferrersPackage objects, one per package that contains a reference.

type SyntaxNode

type SyntaxNode struct {
	Description string `json:"desc"`  // description of syntax tree
	Start       int    `json:"start"` // start byte offset, 0-based
	End         int    `json:"end"`   // end byte offset
}

A SyntaxNode is one element of a stack of enclosing syntax nodes in a "what" query.

type What

type What struct {
	Enclosing  []SyntaxNode `json:"enclosing"`            // enclosing nodes of syntax tree
	Modes      []string     `json:"modes"`                // query modes enabled for this selection.
	SrcDir     string       `json:"srcdir,omitempty"`     // $GOROOT src directory containing queried package
	ImportPath string       `json:"importpath,omitempty"` // import path of queried package
	Object     string       `json:"object,omitempty"`     // name of identified object, if any
	SameIDs    []string     `json:"sameids,omitempty"`    // locations of references to same object
}

A What is the result of the "what" query, which quickly identifies the selection, parsing only a single file. It is intended for use in low-latency GUIs.

type WhichErrs

type WhichErrs struct {
	ErrPos    string          `json:"errpos,omitempty"`    // location of queried error
	Globals   []string        `json:"globals,omitempty"`   // locations of globals
	Constants []string        `json:"constants,omitempty"` // locations of constants
	Types     []WhichErrsType `json:"types,omitempty"`     // Types
}

A WhichErrs is the result of a 'whicherrs' query. It contains the position of the queried error and the possible globals, constants, and types it may point to.

type WhichErrsType

type WhichErrsType struct {
	Type     string `json:"type,omitempty"`
	Position string `json:"position,omitempty"`
}

Source Files