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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/ir"
"cmd/compile/internal/ssa"
"cmd/compile/internal/types"
"cmd/internal/obj"
"sync"
)
// Slices in the runtime are represented by three components:
//
// type slice struct {
// ptr unsafe.Pointer
// len int
// cap int
// }
//
// Strings in the runtime are represented by two components:
//
// type string struct {
// ptr unsafe.Pointer
// len int
// }
//
// These variables are the offsets of fields and sizes of these structs.
var (
slicePtrOffset int64
sliceLenOffset int64
sliceCapOffset int64
sizeofSlice int64
sizeofString int64
)
var pragcgobuf [][]string
var decldepth int32
var inimport bool // set during import
var zerosize int64
var (
okforeq [types.NTYPE]bool
okforadd [types.NTYPE]bool
okforand [types.NTYPE]bool
okfornone [types.NTYPE]bool
okforbool [types.NTYPE]bool
okforcap [types.NTYPE]bool
okforlen [types.NTYPE]bool
okforarith [types.NTYPE]bool
)
var (
okfor [ir.OEND][]bool
iscmp [ir.OEND]bool
)
var (
funcsymsmu sync.Mutex // protects funcsyms and associated package lookups (see func funcsym)
funcsyms []*types.Sym
)
var dclcontext ir.Class // PEXTERN/PAUTO
var Widthptr int
var Widthreg int
var typecheckok bool
// interface to back end
type Arch struct {
LinkArch *obj.LinkArch
REGSP int
MAXWIDTH int64
SoftFloat bool
PadFrame func(int64) int64
// ZeroRange zeroes a range of memory on stack. It is only inserted
// at function entry, and it is ok to clobber registers.
ZeroRange func(*Progs, *obj.Prog, int64, int64, *uint32) *obj.Prog
Ginsnop func(*Progs) *obj.Prog
Ginsnopdefer func(*Progs) *obj.Prog // special ginsnop for deferreturn
// SSAMarkMoves marks any MOVXconst ops that need to avoid clobbering flags.
SSAMarkMoves func(*SSAGenState, *ssa.Block)
// SSAGenValue emits Prog(s) for the Value.
SSAGenValue func(*SSAGenState, *ssa.Value)
// SSAGenBlock emits end-of-block Progs. SSAGenValue should be called
// for all values in the block before SSAGenBlock.
SSAGenBlock func(s *SSAGenState, b, next *ssa.Block)
}
var thearch Arch
var (
BoundsCheckFunc [ssa.BoundsKindCount]*obj.LSym
ExtendCheckFunc [ssa.BoundsKindCount]*obj.LSym
)
// GCWriteBarrierReg maps from registers to gcWriteBarrier implementation LSyms.
var GCWriteBarrierReg map[int16]*obj.LSym
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