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[dev.regabi] cmd/compile: move name code from node.go to name.go

Browse source 
No code changes here, only copying of text.
This will make the diffs in a future CL readable.

Passes buildall w/ toolstash -cmp.

Change-Id: I1b8d8b9ec9408859e36af5ff3bef7c6c10eac0d6
Reviewed-on: https://go-review.googlesource.com/c/go/+/274092
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Russ Cox 2020-11-28 01:03:40 -05:00
parent be3d8b40b5
commit 420809ab08
2 changed files with 376 additions and 364 deletions
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376
src/cmd/compile/internal/ir/name.go Normal file
View file

@ -0,0 +1,376 @@
// Copyright 2020 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 ir
import (
"cmd/compile/internal/base"
"cmd/compile/internal/types"
"cmd/internal/objabi"
"cmd/internal/src"
"go/constant"
)
// Name holds Node fields used only by named nodes (ONAME, OTYPE, OPACK, OLABEL, some OLITERAL).
type Name struct {
Pack Node // real package for import . names
Pkg *types.Pkg // pkg for OPACK nodes
// For a local variable (not param) or extern, the initializing assignment (OAS or OAS2).
// For a closure var, the ONAME node of the outer captured variable
Defn Node
// The ODCLFUNC node (for a static function/method or a closure) in which
// local variable or param is declared.
Curfn Node
Param *Param // additional fields for ONAME, OTYPE
Decldepth int32 // declaration loop depth, increased for every loop or label
// Unique number for ONAME nodes within a function. Function outputs
// (results) are numbered starting at one, followed by function inputs
// (parameters), and then local variables. Vargen is used to distinguish
// local variables/params with the same name.
Vargen int32
flags bitset16
}
type Param struct {
Ntype Node
Heapaddr Node // temp holding heap address of param
// ONAME PAUTOHEAP
Stackcopy Node // the PPARAM/PPARAMOUT on-stack slot (moved func params only)
// ONAME closure linkage
// Consider:
//
// func f() {
// x := 1 // x1
// func() {
// use(x) // x2
// func() {
// use(x) // x3
// --- parser is here ---
// }()
// }()
// }
//
// There is an original declaration of x and then a chain of mentions of x
// leading into the current function. Each time x is mentioned in a new closure,
// we create a variable representing x for use in that specific closure,
// since the way you get to x is different in each closure.
//
// Let's number the specific variables as shown in the code:
// x1 is the original x, x2 is when mentioned in the closure,
// and x3 is when mentioned in the closure in the closure.
//
// We keep these linked (assume N > 1):
//
// - x1.Defn = original declaration statement for x (like most variables)
// - x1.Innermost = current innermost closure x (in this case x3), or nil for none
// - x1.IsClosureVar() = false
//
// - xN.Defn = x1, N > 1
// - xN.IsClosureVar() = true, N > 1
// - x2.Outer = nil
// - xN.Outer = x(N-1), N > 2
//
//
// When we look up x in the symbol table, we always get x1.
// Then we can use x1.Innermost (if not nil) to get the x
// for the innermost known closure function,
// but the first reference in a closure will find either no x1.Innermost
// or an x1.Innermost with .Funcdepth < Funcdepth.
// In that case, a new xN must be created, linked in with:
//
// xN.Defn = x1
// xN.Outer = x1.Innermost
// x1.Innermost = xN
//
// When we finish the function, we'll process its closure variables
// and find xN and pop it off the list using:
//
// x1 := xN.Defn
// x1.Innermost = xN.Outer
//
// We leave x1.Innermost set so that we can still get to the original
// variable quickly. Not shown here, but once we're
// done parsing a function and no longer need xN.Outer for the
// lexical x reference links as described above, funcLit
// recomputes xN.Outer as the semantic x reference link tree,
// even filling in x in intermediate closures that might not
// have mentioned it along the way to inner closures that did.
// See funcLit for details.
//
// During the eventual compilation, then, for closure variables we have:
//
// xN.Defn = original variable
// xN.Outer = variable captured in next outward scope
// to make closure where xN appears
//
// Because of the sharding of pieces of the node, x.Defn means x.Name.Defn
// and x.Innermost/Outer means x.Name.Param.Innermost/Outer.
Innermost Node
Outer Node
// OTYPE & ONAME //go:embed info,
// sharing storage to reduce gc.Param size.
// Extra is nil, or else *Extra is a *paramType or an *embedFileList.
Extra *interface{}
}
// NewNameAt returns a new ONAME Node associated with symbol s at position pos.
// The caller is responsible for setting n.Name.Curfn.
func NewNameAt(pos src.XPos, s *types.Sym) Node {
if s == nil {
base.Fatalf("newnamel nil")
}
var x struct {
n node
m Name
p Param
}
n := &x.n
n.SetName(&x.m)
n.Name().Param = &x.p
n.SetOp(ONAME)
n.SetPos(pos)
n.SetOrig(n)
n.SetSym(s)
return n
}
type paramType struct {
flag PragmaFlag
alias bool
}
// Pragma returns the PragmaFlag for p, which must be for an OTYPE.
func (p *Param) Pragma() PragmaFlag {
if p.Extra == nil {
return 0
}
return (*p.Extra).(*paramType).flag
}
// SetPragma sets the PragmaFlag for p, which must be for an OTYPE.
func (p *Param) SetPragma(flag PragmaFlag) {
if p.Extra == nil {
if flag == 0 {
return
}
p.Extra = new(interface{})
*p.Extra = &paramType{flag: flag}
return
}
(*p.Extra).(*paramType).flag = flag
}
// Alias reports whether p, which must be for an OTYPE, is a type alias.
func (p *Param) Alias() bool {
if p.Extra == nil {
return false
}
t, ok := (*p.Extra).(*paramType)
if !ok {
return false
}
return t.alias
}
// SetAlias sets whether p, which must be for an OTYPE, is a type alias.
func (p *Param) SetAlias(alias bool) {
if p.Extra == nil {
if !alias {
return
}
p.Extra = new(interface{})
*p.Extra = &paramType{alias: alias}
return
}
(*p.Extra).(*paramType).alias = alias
}
type embedFileList []string
// EmbedFiles returns the list of embedded files for p,
// which must be for an ONAME var.
func (p *Param) EmbedFiles() []string {
if p.Extra == nil {
return nil
}
return *(*p.Extra).(*embedFileList)
}
// SetEmbedFiles sets the list of embedded files for p,
// which must be for an ONAME var.
func (p *Param) SetEmbedFiles(list []string) {
if p.Extra == nil {
if len(list) == 0 {
return
}
f := embedFileList(list)
p.Extra = new(interface{})
*p.Extra = &f
return
}
*(*p.Extra).(*embedFileList) = list
}
const (
nameCaptured = 1 << iota // is the variable captured by a closure
nameReadonly
nameByval // is the variable captured by value or by reference
nameNeedzero // if it contains pointers, needs to be zeroed on function entry
nameAutoTemp // is the variable a temporary (implies no dwarf info. reset if escapes to heap)
nameUsed // for variable declared and not used error
nameIsClosureVar // PAUTOHEAP closure pseudo-variable; original at n.Name.Defn
nameIsOutputParamHeapAddr // pointer to a result parameter's heap copy
nameAssigned // is the variable ever assigned to
nameAddrtaken // address taken, even if not moved to heap
nameInlFormal // PAUTO created by inliner, derived from callee formal
nameInlLocal // PAUTO created by inliner, derived from callee local
nameOpenDeferSlot // if temporary var storing info for open-coded defers
nameLibfuzzerExtraCounter // if PEXTERN should be assigned to __libfuzzer_extra_counters section
)
func (n *Name) Captured() bool { return n.flags&nameCaptured != 0 }
func (n *Name) Readonly() bool { return n.flags&nameReadonly != 0 }
func (n *Name) Byval() bool { return n.flags&nameByval != 0 }
func (n *Name) Needzero() bool { return n.flags&nameNeedzero != 0 }
func (n *Name) AutoTemp() bool { return n.flags&nameAutoTemp != 0 }
func (n *Name) Used() bool { return n.flags&nameUsed != 0 }
func (n *Name) IsClosureVar() bool { return n.flags&nameIsClosureVar != 0 }
func (n *Name) IsOutputParamHeapAddr() bool { return n.flags&nameIsOutputParamHeapAddr != 0 }
func (n *Name) Assigned() bool { return n.flags&nameAssigned != 0 }
func (n *Name) Addrtaken() bool { return n.flags&nameAddrtaken != 0 }
func (n *Name) InlFormal() bool { return n.flags&nameInlFormal != 0 }
func (n *Name) InlLocal() bool { return n.flags&nameInlLocal != 0 }
func (n *Name) OpenDeferSlot() bool { return n.flags&nameOpenDeferSlot != 0 }
func (n *Name) LibfuzzerExtraCounter() bool { return n.flags&nameLibfuzzerExtraCounter != 0 }
func (n *Name) SetCaptured(b bool) { n.flags.set(nameCaptured, b) }
func (n *Name) SetReadonly(b bool) { n.flags.set(nameReadonly, b) }
func (n *Name) SetByval(b bool) { n.flags.set(nameByval, b) }
func (n *Name) SetNeedzero(b bool) { n.flags.set(nameNeedzero, b) }
func (n *Name) SetAutoTemp(b bool) { n.flags.set(nameAutoTemp, b) }
func (n *Name) SetUsed(b bool) { n.flags.set(nameUsed, b) }
func (n *Name) SetIsClosureVar(b bool) { n.flags.set(nameIsClosureVar, b) }
func (n *Name) SetIsOutputParamHeapAddr(b bool) { n.flags.set(nameIsOutputParamHeapAddr, b) }
func (n *Name) SetAssigned(b bool) { n.flags.set(nameAssigned, b) }
func (n *Name) SetAddrtaken(b bool) { n.flags.set(nameAddrtaken, b) }
func (n *Name) SetInlFormal(b bool) { n.flags.set(nameInlFormal, b) }
func (n *Name) SetInlLocal(b bool) { n.flags.set(nameInlLocal, b) }
func (n *Name) SetOpenDeferSlot(b bool) { n.flags.set(nameOpenDeferSlot, b) }
func (n *Name) SetLibfuzzerExtraCounter(b bool) { n.flags.set(nameLibfuzzerExtraCounter, b) }
// MarkReadonly indicates that n is an ONAME with readonly contents.
func (n *node) MarkReadonly() {
if n.Op() != ONAME {
base.Fatalf("Node.MarkReadonly %v", n.Op())
}
n.Name().SetReadonly(true)
// Mark the linksym as readonly immediately
// so that the SSA backend can use this information.
// It will be overridden later during dumpglobls.
n.Sym().Linksym().Type = objabi.SRODATA
}
// Val returns the constant.Value for the node.
func (n *node) Val() constant.Value {
if !n.HasVal() {
return constant.MakeUnknown()
}
return *n.e.(*constant.Value)
}
// SetVal sets the constant.Value for the node,
// which must not have been used with SetOpt.
func (n *node) SetVal(v constant.Value) {
if n.hasOpt() {
base.Flag.LowerH = 1
Dump("have Opt", n)
base.Fatalf("have Opt")
}
if n.Op() == OLITERAL {
AssertValidTypeForConst(n.Type(), v)
}
n.setHasVal(true)
n.e = &v
}
// Int64Val returns n as an int64.
// n must be an integer or rune constant.
func (n *node) Int64Val() int64 {
if !IsConst(n, constant.Int) {
base.Fatalf("Int64Val(%v)", n)
}
x, ok := constant.Int64Val(n.Val())
if !ok {
base.Fatalf("Int64Val(%v)", n)
}
return x
}
// CanInt64 reports whether it is safe to call Int64Val() on n.
func (n *node) CanInt64() bool {
if !IsConst(n, constant.Int) {
return false
}
// if the value inside n cannot be represented as an int64, the
// return value of Int64 is undefined
_, ok := constant.Int64Val(n.Val())
return ok
}
// Uint64Val returns n as an uint64.
// n must be an integer or rune constant.
func (n *node) Uint64Val() uint64 {
if !IsConst(n, constant.Int) {
base.Fatalf("Uint64Val(%v)", n)
}
x, ok := constant.Uint64Val(n.Val())
if !ok {
base.Fatalf("Uint64Val(%v)", n)
}
return x
}
// BoolVal returns n as a bool.
// n must be a boolean constant.
func (n *node) BoolVal() bool {
if !IsConst(n, constant.Bool) {
base.Fatalf("BoolVal(%v)", n)
}
return constant.BoolVal(n.Val())
}
// StringVal returns the value of a literal string Node as a string.
// n must be a string constant.
func (n *node) StringVal() string {
if !IsConst(n, constant.String) {
base.Fatalf("StringVal(%v)", n)
}
return constant.StringVal(n.Val())
}
// The Class of a variable/function describes the "storage class"
// of a variable or function. During parsing, storage classes are
// called declaration contexts.
type Class uint8
//go:generate stringer -type=Class
const (
Pxxx Class = iota // no class; used during ssa conversion to indicate pseudo-variables
PEXTERN // global variables
PAUTO // local variables
PAUTOHEAP // local variables or parameters moved to heap
PPARAM // input arguments
PPARAMOUT // output results
PFUNC // global functions
// Careful: Class is stored in three bits in Node.flags.
_ = uint((1 << 3) - iota) // static assert for iota <= (1 << 3)
)

364
src/cmd/compile/internal/ir/node.go
View file

@ -15,7 +15,6 @@ import (
"cmd/compile/internal/base"
"cmd/compile/internal/types"
"cmd/internal/obj"
"cmd/internal/objabi"
"cmd/internal/src"
)
@ -379,41 +378,6 @@ func (n *node) SetBounded(b bool) {
n.flags.set(nodeBounded, b)
}
// MarkReadonly indicates that n is an ONAME with readonly contents.
func (n *node) MarkReadonly() {
if n.Op() != ONAME {
base.Fatalf("Node.MarkReadonly %v", n.Op())
}
n.Name().SetReadonly(true)
// Mark the linksym as readonly immediately
// so that the SSA backend can use this information.
// It will be overridden later during dumpglobls.
n.Sym().Linksym().Type = objabi.SRODATA
}
// Val returns the constant.Value for the node.
func (n *node) Val() constant.Value {
if !n.HasVal() {
return constant.MakeUnknown()
}
return *n.e.(*constant.Value)
}
// SetVal sets the constant.Value for the node,
// which must not have been used with SetOpt.
func (n *node) SetVal(v constant.Value) {
if n.hasOpt() {
base.Flag.LowerH = 1
Dump("have Opt", n)
base.Fatalf("have Opt")
}
if n.Op() == OLITERAL {
AssertValidTypeForConst(n.Type(), v)
}
n.setHasVal(true)
n.e = &v
}
// Opt returns the optimizer data for the node.
func (n *node) Opt() interface{} {
if !n.hasOpt() {
@ -500,235 +464,6 @@ func PkgFuncName(n Node) string {
func (n *node) CanBeAnSSASym() {
}
// Name holds Node fields used only by named nodes (ONAME, OTYPE, OPACK, OLABEL, some OLITERAL).
type Name struct {
Pack Node // real package for import . names
Pkg *types.Pkg // pkg for OPACK nodes
// For a local variable (not param) or extern, the initializing assignment (OAS or OAS2).
// For a closure var, the ONAME node of the outer captured variable
Defn Node
// The ODCLFUNC node (for a static function/method or a closure) in which
// local variable or param is declared.
Curfn Node
Param *Param // additional fields for ONAME, OTYPE
Decldepth int32 // declaration loop depth, increased for every loop or label
// Unique number for ONAME nodes within a function. Function outputs
// (results) are numbered starting at one, followed by function inputs
// (parameters), and then local variables. Vargen is used to distinguish
// local variables/params with the same name.
Vargen int32
flags bitset16
}
const (
nameCaptured = 1 << iota // is the variable captured by a closure
nameReadonly
nameByval // is the variable captured by value or by reference
nameNeedzero // if it contains pointers, needs to be zeroed on function entry
nameAutoTemp // is the variable a temporary (implies no dwarf info. reset if escapes to heap)
nameUsed // for variable declared and not used error
nameIsClosureVar // PAUTOHEAP closure pseudo-variable; original at n.Name.Defn
nameIsOutputParamHeapAddr // pointer to a result parameter's heap copy
nameAssigned // is the variable ever assigned to
nameAddrtaken // address taken, even if not moved to heap
nameInlFormal // PAUTO created by inliner, derived from callee formal
nameInlLocal // PAUTO created by inliner, derived from callee local
nameOpenDeferSlot // if temporary var storing info for open-coded defers
nameLibfuzzerExtraCounter // if PEXTERN should be assigned to __libfuzzer_extra_counters section
)
func (n *Name) Captured() bool { return n.flags&nameCaptured != 0 }
func (n *Name) Readonly() bool { return n.flags&nameReadonly != 0 }
func (n *Name) Byval() bool { return n.flags&nameByval != 0 }
func (n *Name) Needzero() bool { return n.flags&nameNeedzero != 0 }
func (n *Name) AutoTemp() bool { return n.flags&nameAutoTemp != 0 }
func (n *Name) Used() bool { return n.flags&nameUsed != 0 }
func (n *Name) IsClosureVar() bool { return n.flags&nameIsClosureVar != 0 }
func (n *Name) IsOutputParamHeapAddr() bool { return n.flags&nameIsOutputParamHeapAddr != 0 }
func (n *Name) Assigned() bool { return n.flags&nameAssigned != 0 }
func (n *Name) Addrtaken() bool { return n.flags&nameAddrtaken != 0 }
func (n *Name) InlFormal() bool { return n.flags&nameInlFormal != 0 }
func (n *Name) InlLocal() bool { return n.flags&nameInlLocal != 0 }
func (n *Name) OpenDeferSlot() bool { return n.flags&nameOpenDeferSlot != 0 }
func (n *Name) LibfuzzerExtraCounter() bool { return n.flags&nameLibfuzzerExtraCounter != 0 }
func (n *Name) SetCaptured(b bool) { n.flags.set(nameCaptured, b) }
func (n *Name) SetReadonly(b bool) { n.flags.set(nameReadonly, b) }
func (n *Name) SetByval(b bool) { n.flags.set(nameByval, b) }
func (n *Name) SetNeedzero(b bool) { n.flags.set(nameNeedzero, b) }
func (n *Name) SetAutoTemp(b bool) { n.flags.set(nameAutoTemp, b) }
func (n *Name) SetUsed(b bool) { n.flags.set(nameUsed, b) }
func (n *Name) SetIsClosureVar(b bool) { n.flags.set(nameIsClosureVar, b) }
func (n *Name) SetIsOutputParamHeapAddr(b bool) { n.flags.set(nameIsOutputParamHeapAddr, b) }
func (n *Name) SetAssigned(b bool) { n.flags.set(nameAssigned, b) }
func (n *Name) SetAddrtaken(b bool) { n.flags.set(nameAddrtaken, b) }
func (n *Name) SetInlFormal(b bool) { n.flags.set(nameInlFormal, b) }
func (n *Name) SetInlLocal(b bool) { n.flags.set(nameInlLocal, b) }
func (n *Name) SetOpenDeferSlot(b bool) { n.flags.set(nameOpenDeferSlot, b) }
func (n *Name) SetLibfuzzerExtraCounter(b bool) { n.flags.set(nameLibfuzzerExtraCounter, b) }
type Param struct {
Ntype Node
Heapaddr Node // temp holding heap address of param
// ONAME PAUTOHEAP
Stackcopy Node // the PPARAM/PPARAMOUT on-stack slot (moved func params only)
// ONAME closure linkage
// Consider:
//
// func f() {
// x := 1 // x1
// func() {
// use(x) // x2
// func() {
// use(x) // x3
// --- parser is here ---
// }()
// }()
// }
//
// There is an original declaration of x and then a chain of mentions of x
// leading into the current function. Each time x is mentioned in a new closure,
// we create a variable representing x for use in that specific closure,
// since the way you get to x is different in each closure.
//
// Let's number the specific variables as shown in the code:
// x1 is the original x, x2 is when mentioned in the closure,
// and x3 is when mentioned in the closure in the closure.
//
// We keep these linked (assume N > 1):
//
// - x1.Defn = original declaration statement for x (like most variables)
// - x1.Innermost = current innermost closure x (in this case x3), or nil for none
// - x1.IsClosureVar() = false
//
// - xN.Defn = x1, N > 1
// - xN.IsClosureVar() = true, N > 1
// - x2.Outer = nil
// - xN.Outer = x(N-1), N > 2
//
//
// When we look up x in the symbol table, we always get x1.
// Then we can use x1.Innermost (if not nil) to get the x
// for the innermost known closure function,
// but the first reference in a closure will find either no x1.Innermost
// or an x1.Innermost with .Funcdepth < Funcdepth.
// In that case, a new xN must be created, linked in with:
//
// xN.Defn = x1
// xN.Outer = x1.Innermost
// x1.Innermost = xN
//
// When we finish the function, we'll process its closure variables
// and find xN and pop it off the list using:
//
// x1 := xN.Defn
// x1.Innermost = xN.Outer
//
// We leave x1.Innermost set so that we can still get to the original
// variable quickly. Not shown here, but once we're
// done parsing a function and no longer need xN.Outer for the
// lexical x reference links as described above, funcLit
// recomputes xN.Outer as the semantic x reference link tree,
// even filling in x in intermediate closures that might not
// have mentioned it along the way to inner closures that did.
// See funcLit for details.
//
// During the eventual compilation, then, for closure variables we have:
//
// xN.Defn = original variable
// xN.Outer = variable captured in next outward scope
// to make closure where xN appears
//
// Because of the sharding of pieces of the node, x.Defn means x.Name.Defn
// and x.Innermost/Outer means x.Name.Param.Innermost/Outer.
Innermost Node
Outer Node
// OTYPE & ONAME //go:embed info,
// sharing storage to reduce gc.Param size.
// Extra is nil, or else *Extra is a *paramType or an *embedFileList.
Extra *interface{}
}
type paramType struct {
flag PragmaFlag
alias bool
}
type embedFileList []string
// Pragma returns the PragmaFlag for p, which must be for an OTYPE.
func (p *Param) Pragma() PragmaFlag {
if p.Extra == nil {
return 0
}
return (*p.Extra).(*paramType).flag
}
// SetPragma sets the PragmaFlag for p, which must be for an OTYPE.
func (p *Param) SetPragma(flag PragmaFlag) {
if p.Extra == nil {
if flag == 0 {
return
}
p.Extra = new(interface{})
*p.Extra = &paramType{flag: flag}
return
}
(*p.Extra).(*paramType).flag = flag
}
// Alias reports whether p, which must be for an OTYPE, is a type alias.
func (p *Param) Alias() bool {
if p.Extra == nil {
return false
}
t, ok := (*p.Extra).(*paramType)
if !ok {
return false
}
return t.alias
}
// SetAlias sets whether p, which must be for an OTYPE, is a type alias.
func (p *Param) SetAlias(alias bool) {
if p.Extra == nil {
if !alias {
return
}
p.Extra = new(interface{})
*p.Extra = &paramType{alias: alias}
return
}
(*p.Extra).(*paramType).alias = alias
}
// EmbedFiles returns the list of embedded files for p,
// which must be for an ONAME var.
func (p *Param) EmbedFiles() []string {
if p.Extra == nil {
return nil
}
return *(*p.Extra).(*embedFileList)
}
// SetEmbedFiles sets the list of embedded files for p,
// which must be for an ONAME var.
func (p *Param) SetEmbedFiles(list []string) {
if p.Extra == nil {
if len(list) == 0 {
return
}
f := embedFileList(list)
p.Extra = new(interface{})
*p.Extra = &f
return
}
*(*p.Extra).(*embedFileList) = list
}
// A Func corresponds to a single function in a Go program
// (and vice versa: each function is denoted by exactly one *Func).
//
@ -1369,49 +1104,6 @@ func (s NodeSet) Sorted(less func(Node, Node) bool) []Node {
return res
}
// NewNameAt returns a new ONAME Node associated with symbol s at position pos.
// The caller is responsible for setting n.Name.Curfn.
func NewNameAt(pos src.XPos, s *types.Sym) Node {
if s == nil {
base.Fatalf("newnamel nil")
}
var x struct {
n node
m Name
p Param
}
n := &x.n
n.SetName(&x.m)
n.Name().Param = &x.p
n.SetOp(ONAME)
n.SetPos(pos)
n.SetOrig(n)
n.SetSym(s)
return n
}
// The Class of a variable/function describes the "storage class"
// of a variable or function. During parsing, storage classes are
// called declaration contexts.
type Class uint8
//go:generate stringer -type=Class
const (
Pxxx Class = iota // no class; used during ssa conversion to indicate pseudo-variables
PEXTERN // global variables
PAUTO // local variables
PAUTOHEAP // local variables or parameters moved to heap
PPARAM // input arguments
PPARAMOUT // output results
PFUNC // global functions
// Careful: Class is stored in three bits in Node.flags.
_ = uint((1 << 3) - iota) // static assert for iota <= (1 << 3)
)
type PragmaFlag int16
const (
@ -1550,62 +1242,6 @@ func IsConst(n Node, ct constant.Kind) bool {
return ConstType(n) == ct
}
// Int64Val returns n as an int64.
// n must be an integer or rune constant.
func (n *node) Int64Val() int64 {
if !IsConst(n, constant.Int) {
base.Fatalf("Int64Val(%v)", n)
}
x, ok := constant.Int64Val(n.Val())
if !ok {
base.Fatalf("Int64Val(%v)", n)
}
return x
}
// CanInt64 reports whether it is safe to call Int64Val() on n.
func (n *node) CanInt64() bool {
if !IsConst(n, constant.Int) {
return false
}
// if the value inside n cannot be represented as an int64, the
// return value of Int64 is undefined
_, ok := constant.Int64Val(n.Val())
return ok
}
// Uint64Val returns n as an uint64.
// n must be an integer or rune constant.
func (n *node) Uint64Val() uint64 {
if !IsConst(n, constant.Int) {
base.Fatalf("Uint64Val(%v)", n)
}
x, ok := constant.Uint64Val(n.Val())
if !ok {
base.Fatalf("Uint64Val(%v)", n)
}
return x
}
// BoolVal returns n as a bool.
// n must be a boolean constant.
func (n *node) BoolVal() bool {
if !IsConst(n, constant.Bool) {
base.Fatalf("BoolVal(%v)", n)
}
return constant.BoolVal(n.Val())
}
// StringVal returns the value of a literal string Node as a string.
// n must be a string constant.
func (n *node) StringVal() string {
if !IsConst(n, constant.String) {
base.Fatalf("StringVal(%v)", n)
}
return constant.StringVal(n.Val())
}
// rawcopy returns a shallow copy of n.
// Note: copy or sepcopy (rather than rawcopy) is usually the
// correct choice (see comment with Node.copy, below).