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// Copyright 2009 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 gc
import (
"cmd/compile/internal/types"
"cmd/internal/obj"
"cmd/internal/src"
"strconv"
)
// sysfunc looks up Go function name in package runtime. This function
// must follow the internal calling convention.
func sysfunc(name string) *obj.LSym {
s := Runtimepkg.Lookup(name)
s.SetFunc(true)
return s.Linksym()
}
// sysvar looks up a variable (or assembly function) name in package
// runtime. If this is a function, it may have a special calling
// convention.
func sysvar(name string) *obj.LSym {
return Runtimepkg.Lookup(name).Linksym()
}
// isParamStackCopy reports whether this is the on-stack copy of a
// function parameter that moved to the heap.
func (n *Node) isParamStackCopy() bool {
return n.Op == ONAME && (n.Class() == PPARAM || n.Class() == PPARAMOUT) && n.Name.Param.Heapaddr != nil
}
// isParamHeapCopy reports whether this is the on-heap copy of
// a function parameter that moved to the heap.
func (n *Node) isParamHeapCopy() bool {
return n.Op == ONAME && n.Class() == PAUTOHEAP && n.Name.Param.Stackcopy != nil
}
// autotmpname returns the name for an autotmp variable numbered n.
func autotmpname(n int) string {
// Give each tmp a different name so that they can be registerized.
// Add a preceding . to avoid clashing with legal names.
const prefix = ".autotmp_"
// Start with a buffer big enough to hold a large n.
b := []byte(prefix + " ")[:len(prefix)]
b = strconv.AppendInt(b, int64(n), 10)
return types.InternString(b)
}
// make a new Node off the books
func tempAt(pos src.XPos, curfn *Node, t *types.Type) *Node {
if curfn == nil {
Fatalf("no curfn for tempAt")
}
if curfn.Func.Closure != nil && curfn.Op == OCLOSURE {
Dump("tempAt", curfn)
Fatalf("adding tempAt to wrong closure function")
}
if t == nil {
Fatalf("tempAt called with nil type")
}
s := &types.Sym{
Name: autotmpname(len(curfn.Func.Dcl)),
Pkg: localpkg,
}
n := newnamel(pos, s)
s.Def = asTypesNode(n)
n.Type = t
n.SetClass(PAUTO)
n.Esc = EscNever
n.Name.Curfn = curfn
n.Name.SetUsed(true)
n.Name.SetAutoTemp(true)
curfn.Func.Dcl = append(curfn.Func.Dcl, n)
dowidth(t)
return n.Orig
}
func temp(t *types.Type) *Node {
return tempAt(lineno, Curfn, t)
}