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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 typecheck
import (
"cmd/compile/internal/base"
"cmd/compile/internal/ir"
"cmd/compile/internal/types"
"cmd/internal/obj"
)
// LookupRuntime returns a function or variable declared in
// _builtin/runtime.go. If types_ is non-empty, successive occurrences
// of the "any" placeholder type will be substituted.
func LookupRuntime(name string, types_ ...*types.Type) *ir.Name {
s := ir.Pkgs.Runtime.Lookup(name)
if s == nil || s.Def == nil {
base.Fatalf("LookupRuntime: can't find runtime.%s", name)
}
n := s.Def.(*ir.Name)
if len(types_) != 0 {
n = substArgTypes(n, types_...)
}
return n
}
// SubstArgTypes substitutes the given list of types for
// successive occurrences of the "any" placeholder in the
// type syntax expression n.Type.
func substArgTypes(old *ir.Name, types_ ...*types.Type) *ir.Name {
for _, t := range types_ {
types.CalcSize(t)
}
n := ir.NewNameAt(old.Pos(), old.Sym(), types.SubstAny(old.Type(), &types_))
n.Class = old.Class
n.Func = old.Func
if len(types_) > 0 {
base.Fatalf("SubstArgTypes: too many argument types")
}
return n
}
// AutoLabel generates a new Name node for use with
// an automatically generated label.
// prefix is a short mnemonic (e.g. ".s" for switch)
// to help with debugging.
// It should begin with "." to avoid conflicts with
// user labels.
func AutoLabel(prefix string) *types.Sym {
if prefix[0] != '.' {
base.Fatalf("autolabel prefix must start with '.', have %q", prefix)
}
fn := ir.CurFunc
if ir.CurFunc == nil {
base.Fatalf("autolabel outside function")
}
n := fn.Label
fn.Label++
return LookupNum(prefix, int(n))
}
func Lookup(name string) *types.Sym {
return types.LocalPkg.Lookup(name)
}
// InitRuntime loads the definitions for the low-level runtime functions,
// so that the compiler can generate calls to them,
// but does not make them visible to user code.
func InitRuntime() {
base.Timer.Start("fe", "loadsys")
typs := runtimeTypes()
for _, d := range &runtimeDecls {
sym := ir.Pkgs.Runtime.Lookup(d.name)
typ := typs[d.typ]
switch d.tag {
case funcTag:
importfunc(sym, typ)
case varTag:
importvar(sym, typ)
default:
base.Fatalf("unhandled declaration tag %v", d.tag)
}
}
}
// LookupRuntimeFunc looks up Go function name in package runtime. This function
// must follow the internal calling convention.
func LookupRuntimeFunc(name string) *obj.LSym {
return LookupRuntimeABI(name, obj.ABIInternal)
}
// LookupRuntimeVar looks up a variable (or assembly function) name in package
// runtime. If this is a function, it may have a special calling
// convention.
func LookupRuntimeVar(name string) *obj.LSym {
return LookupRuntimeABI(name, obj.ABI0)
}
// LookupRuntimeABI looks up a name in package runtime using the given ABI.
func LookupRuntimeABI(name string, abi obj.ABI) *obj.LSym {
return base.PkgLinksym("runtime", name, abi)
}
// InitCoverage loads the definitions for routines called
// by code coverage instrumentation (similar to InitRuntime above).
func InitCoverage() {
typs := coverageTypes()
for _, d := range &coverageDecls {
sym := ir.Pkgs.Coverage.Lookup(d.name)
typ := typs[d.typ]
switch d.tag {
case funcTag:
importfunc(sym, typ)
case varTag:
importvar(sym, typ)
default:
base.Fatalf("unhandled declaration tag %v", d.tag)
}
}
}
// LookupCoverage looks up the Go function 'name' in package
// runtime/coverage. This function must follow the internal calling
// convention.
func LookupCoverage(name string) *ir.Name {
sym := ir.Pkgs.Coverage.Lookup(name)
if sym == nil {
base.Fatalf("LookupCoverage: can't find runtime/coverage.%s", name)
}
return sym.Def.(*ir.Name)
}