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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/base"
"cmd/compile/internal/ir"
"cmd/compile/internal/ssa"
"cmd/compile/internal/types"
"cmd/internal/obj"
"cmd/internal/src"
"sync"
)
var (
// maximum size variable which we will allocate on the stack.
// This limit is for explicit variable declarations like "var x T" or "x := ...".
// Note: the flag smallframes can update this value.
maxStackVarSize = int64(10 * 1024 * 1024)
// maximum size of implicit variables that we will allocate on the stack.
// p := new(T) allocating T on the stack
// p := &T{} allocating T on the stack
// s := make([]T, n) allocating [n]T on the stack
// s := []byte("...") allocating [n]byte on the stack
// Note: the flag smallframes can update this value.
maxImplicitStackVarSize = int64(64 * 1024)
// smallArrayBytes is the maximum size of an array which is considered small.
// Small arrays will be initialized directly with a sequence of constant stores.
// Large arrays will be initialized by copying from a static temp.
// 256 bytes was chosen to minimize generated code + statictmp size.
smallArrayBytes = int64(256)
)
// isRuntimePkg reports whether p is package runtime.
func isRuntimePkg(p *types.Pkg) bool {
if base.Flag.CompilingRuntime && p == ir.LocalPkg {
return true
}
return p.Path == "runtime"
}
// isReflectPkg reports whether p is package reflect.
func isReflectPkg(p *types.Pkg) bool {
if p == ir.LocalPkg {
return base.Ctxt.Pkgpath == "reflect"
}
return p.Path == "reflect"
}
// 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 nolocalimports bool
var inimport bool // set during import
var itabpkg *types.Pkg // fake pkg for itab entries
var itablinkpkg *types.Pkg // fake package for runtime itab entries
var Runtimepkg *types.Pkg // fake package runtime
var racepkg *types.Pkg // package runtime/race
var msanpkg *types.Pkg // package runtime/msan
var unsafepkg *types.Pkg // package unsafe
var trackpkg *types.Pkg // fake package for field tracking
var mappkg *types.Pkg // fake package for map zero value
var gopkg *types.Pkg // pseudo-package for method symbols on anonymous receiver types
var zerosize int64
var simtype [types.NTYPE]types.EType
var (
isInt [types.NTYPE]bool
isFloat [types.NTYPE]bool
isComplex [types.NTYPE]bool
issimple [types.NTYPE]bool
)
var (
okforeq [types.NTYPE]bool
okforadd [types.NTYPE]bool
okforand [types.NTYPE]bool
okfornone [types.NTYPE]bool
okforcmp [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 xtop []ir.Node
var exportlist []ir.Node
var importlist []ir.Node // imported functions and methods with inlinable bodies
var (
funcsymsmu sync.Mutex // protects funcsyms and associated package lookups (see func funcsym)
funcsyms []*types.Sym
)
var dclcontext ir.Class // PEXTERN/PAUTO
var Curfn ir.Node
var Widthptr int
var Widthreg int
var typecheckok bool
// Whether we are adding any sort of code instrumentation, such as
// when the race detector is enabled.
var instrumenting bool
// Whether we are tracking lexical scopes for DWARF.
var trackScopes bool
var nodfp ir.Node
var autogeneratedPos src.XPos
// 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 (
staticuint64s,
zerobase ir.Node
assertE2I,
assertE2I2,
assertI2I,
assertI2I2,
deferproc,
deferprocStack,
Deferreturn,
Duffcopy,
Duffzero,
gcWriteBarrier,
goschedguarded,
growslice,
msanread,
msanwrite,
newobject,
newproc,
panicdivide,
panicshift,
panicdottypeE,
panicdottypeI,
panicnildottype,
panicoverflow,
raceread,
racereadrange,
racewrite,
racewriterange,
x86HasPOPCNT,
x86HasSSE41,
x86HasFMA,
armHasVFPv4,
arm64HasATOMICS,
typedmemclr,
typedmemmove,
Udiv,
writeBarrier,
zerobaseSym *obj.LSym
BoundsCheckFunc [ssa.BoundsKindCount]*obj.LSym
ExtendCheckFunc [ssa.BoundsKindCount]*obj.LSym
// Wasm
WasmMove,
WasmZero,
WasmDiv,
WasmTruncS,
WasmTruncU,
SigPanic *obj.LSym
)
// GCWriteBarrierReg maps from registers to gcWriteBarrier implementation LSyms.
var GCWriteBarrierReg map[int16]*obj.LSym
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