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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/ssa"
"cmd/compile/internal/types"
"cmd/internal/bio"
"cmd/internal/obj"
"cmd/internal/src"
"sync"
)
const (
BADWIDTH = types.BADWIDTH
MaxStackVarSize = 10 * 1024 * 1024
)
// isRuntimePkg reports whether p is package runtime.
func isRuntimePkg(p *types.Pkg) bool {
if compiling_runtime && p == localpkg {
return true
}
return p.Path == "runtime"
}
// 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 variable
PAUTO // local variables
PAUTOHEAP // local variable or parameter moved to heap
PPARAM // input arguments
PPARAMOUT // output results
PFUNC // global function
PDISCARD // discard during parse of duplicate import
// Careful: Class is stored in three bits in Node.flags.
// Adding a new Class will overflow that.
)
func init() {
if PDISCARD != 7 {
panic("PDISCARD changed; does all Class values still fit in three bits?")
}
}
// note this is the runtime representation
// of the compilers arrays.
//
// typedef struct
// { // must not move anything
// uchar array[8]; // pointer to data
// uchar nel[4]; // number of elements
// uchar cap[4]; // allocated number of elements
// } Array;
var array_array int // runtime offsetof(Array,array) - same for String
var array_nel int // runtime offsetof(Array,nel) - same for String
var array_cap int // runtime offsetof(Array,cap)
var sizeof_Array int // runtime sizeof(Array)
// note this is the runtime representation
// of the compilers strings.
//
// typedef struct
// { // must not move anything
// uchar array[8]; // pointer to data
// uchar nel[4]; // number of elements
// } String;
var sizeof_String int // runtime sizeof(String)
var pragcgobuf string
var outfile string
var linkobj string
var dolinkobj bool
var bout *bio.Writer
// nerrors is the number of compiler errors reported
// since the last call to saveerrors.
var nerrors int
// nsavederrors is the total number of compiler errors
// reported before the last call to saveerrors.
var nsavederrors int
var nsyntaxerrors int
var decldepth int32
var safemode bool
var nolocalimports bool
var Debug [256]int
var debugstr string
var Debug_checknil int
var Debug_typeassert int
var localpkg *types.Pkg // package being compiled
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 zerosize int64
var myimportpath string
var localimport string
var asmhdr string
var simtype [NTYPE]types.EType
var (
isforw [NTYPE]bool
isInt [NTYPE]bool
isFloat [NTYPE]bool
isComplex [NTYPE]bool
issimple [NTYPE]bool
)
var (
okforeq [NTYPE]bool
okforadd [NTYPE]bool
okforand [NTYPE]bool
okfornone [NTYPE]bool
okforcmp [NTYPE]bool
okforbool [NTYPE]bool
okforcap [NTYPE]bool
okforlen [NTYPE]bool
okforarith [NTYPE]bool
okforconst [NTYPE]bool
)
var (
okfor [OEND][]bool
iscmp [OEND]bool
)
var minintval [NTYPE]*Mpint
var maxintval [NTYPE]*Mpint
var minfltval [NTYPE]*Mpflt
var maxfltval [NTYPE]*Mpflt
var xtop []*Node
var exportlist []*Node
var importlist []*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 Class // PEXTERN/PAUTO
var Curfn *Node
var Widthptr int
var Widthreg int
var nblank *Node
var typecheckok bool
var compiling_runtime bool
// Compiling the standard library
var compiling_std bool
var compiling_wrappers int
var use_writebarrier bool
var pure_go bool
var flag_installsuffix string
var flag_race bool
var flag_msan bool
var flagDWARF 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 debuglive int
var Ctxt *obj.Link
var writearchive bool
var Nacl bool
var nodfp *Node
var disable_checknil int
var autogeneratedPos src.XPos
// interface to back end
type Arch struct {
LinkArch *obj.LinkArch
REGSP int
MAXWIDTH int64
Use387 bool // should 386 backend use 387 FP instructions instead of sse2.
PadFrame func(int64) int64
ZeroRange func(*Progs, *obj.Prog, int64, int64, *uint32) *obj.Prog
Ginsnop func(*Progs)
// 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)
// ZeroAuto emits code to zero the given auto stack variable.
// ZeroAuto must not use any non-temporary registers.
// ZeroAuto will only be called for variables which contain a pointer.
ZeroAuto func(*Progs, *Node)
}
var thearch Arch
var (
staticbytes,
zerobase *Node
Newproc,
Deferproc,
Deferreturn,
Duffcopy,
Duffzero,
panicindex,
panicslice,
panicdivide,
growslice,
panicdottypeE,
panicdottypeI,
panicnildottype,
assertE2I,
assertE2I2,
assertI2I,
assertI2I2,
goschedguarded,
writeBarrier,
writebarrierptr,
typedmemmove,
typedmemclr,
Udiv *obj.LSym
)