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cmd/compile: fmt improvements for AST nodes and some comments on AST nodes

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Changed fmt.go to print out some extra information for various kinds of
Nodes. This includes some extra (small) info in the %j (jconv) output,
and some missing sections (such as Dcls and the body of a closure) in
nodedump().

Also, added some extra doc comments for a few Node types in syntax.go

Change-Id: I2ec7184e2abe0d5fbe3fb5a2506da7c7b06f2fb1
Reviewed-on: https://go-review.googlesource.com/c/go/+/266437
Run-TryBot: Dan Scales <danscales@google.com>
Trust: Dan Scales <danscales@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Dan Scales 2020-10-29 15:31:16 -07:00
parent fd56942fe3
commit 07e4f0fd4b
2 changed files with 46 additions and 8 deletions
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25
src/cmd/compile/internal/gc/syntax.go
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@ -631,7 +631,7 @@ type Func struct {
Ntype *Node // signature
Top int // top context (ctxCallee, etc)
Closure *Node // OCLOSURE <-> ODCLFUNC
Nname *Node
Nname *Node // The ONAME node associated with an ODCLFUNC (both have same Type)
lsym *obj.LSym
Inl *Inline
@ -773,7 +773,7 @@ const (
OCALLPART // Left.Right (method expression x.Method, not called)
OCAP // cap(Left)
OCLOSE // close(Left)
OCLOSURE // func Type { Body } (func literal)
OCLOSURE // func Type { Func.Closure.Nbody } (func literal)
OCOMPLIT // Right{List} (composite literal, not yet lowered to specific form)
OMAPLIT // Type{List} (composite literal, Type is map)
OSTRUCTLIT // Type{List} (composite literal, Type is struct)
@ -863,9 +863,14 @@ const (
OSIZEOF // unsafe.Sizeof(Left)
// statements
OBLOCK // { List } (block of code)
OBREAK // break [Sym]
OCASE // case List: Nbody (List==nil means default)
OBLOCK // { List } (block of code)
OBREAK // break [Sym]
// OCASE: case List: Nbody (List==nil means default)
// For OTYPESW, List is a OTYPE node for the specified type (or OLITERAL
// for nil), and, if a type-switch variable is specified, Rlist is an
// ONAME for the version of the type-switch variable with the specified
// type.
OCASE
OCONTINUE // continue [Sym]
ODEFER // defer Left (Left must be call)
OEMPTY // no-op (empty statement)
@ -889,15 +894,19 @@ const (
ORETURN // return List
OSELECT // select { List } (List is list of OCASE)
OSWITCH // switch Ninit; Left { List } (List is a list of OCASE)
OTYPESW // Left = Right.(type) (appears as .Left of OSWITCH)
// OTYPESW: Left := Right.(type) (appears as .Left of OSWITCH)
// Left is nil if there is no type-switch variable
OTYPESW
// types
OTCHAN // chan int
OTMAP // map[string]int
OTSTRUCT // struct{}
OTINTER // interface{}
OTFUNC // func()
OTARRAY // []int, [8]int, [N]int or [...]int
// OTFUNC: func() - Left is receiver field, List is list of param fields, Rlist is
// list of result fields.
OTFUNC
OTARRAY // []int, [8]int, [N]int or [...]int
// misc
ODDD // func f(args ...int) or f(l...) or var a = [...]int{0, 1, 2}.