Gecko [ 167.86.127.34 ]

Name	Size	Permission
gen	[ DIR ]	drwxr-xr-x
testdata	[ DIR ]	drwxr-xr-x
README.md	7.76 KB	-rw-r--r--
TODO	950 B	-rw-r--r--
biasedsparsemap.go	2.71 KB	-rw-r--r--
block.go	8.64 KB	-rw-r--r--
branchelim.go	11.41 KB	-rw-r--r--
branchelim_test.go	5.21 KB	-rw-r--r--
cache.go	2.46 KB	-rw-r--r--
check.go	13.9 KB	-rw-r--r--
checkbce.go	956 B	-rw-r--r--
compile.go	16.22 KB	-rw-r--r--
config.go	11.39 KB	-rw-r--r--
copyelim.go	1.82 KB	-rw-r--r--
copyelim_test.go	1.29 KB	-rw-r--r--
critical.go	3.15 KB	-rw-r--r--
cse.go	10.62 KB	-rw-r--r--
cse_test.go	4.21 KB	-rw-r--r--
deadcode.go	9.73 KB	-rw-r--r--
deadcode_test.go	3.49 KB	-rw-r--r--
deadstore.go	8.98 KB	-rw-r--r--
deadstore_test.go	4.09 KB	-rw-r--r--
debug.go	33.92 KB	-rw-r--r--
debug_test.go	28.68 KB	-rw-r--r--
decompose.go	10.91 KB	-rw-r--r--
dom.go	7.98 KB	-rw-r--r--
dom_test.go	13.34 KB	-rw-r--r--
export_test.go	5.68 KB	-rw-r--r--
flagalloc.go	5.49 KB	-rw-r--r--
func.go	22.17 KB	-rw-r--r--
func_test.go	12.85 KB	-rw-r--r--
fuse.go	5.7 KB	-rw-r--r--
fuse_test.go	5.04 KB	-rw-r--r--
html.go	29.04 KB	-rw-r--r--
id.go	576 B	-rw-r--r--
layout.go	3.56 KB	-rw-r--r--
lca.go	3.71 KB	-rw-r--r--
lca_test.go	1.65 KB	-rw-r--r--
likelyadjust.go	15.23 KB	-rw-r--r--
location.go	2.8 KB	-rw-r--r--
loopbce.go	9.85 KB	-rw-r--r--
loopreschedchecks.go	15.36 KB	-rw-r--r--
looprotate.go	2.24 KB	-rw-r--r--
lower.go	1.24 KB	-rw-r--r--
magic.go	13.42 KB	-rw-r--r--
magic_test.go	9.1 KB	-rw-r--r--
nilcheck.go	11.11 KB	-rw-r--r--
nilcheck_test.go	12.07 KB	-rw-r--r--
numberlines.go	8.44 KB	-rw-r--r--
op.go	8.74 KB	-rw-r--r--
opGen.go	839.32 KB	-rw-r--r--
opt.go	290 B	-rw-r--r--
passbm_test.go	3.14 KB	-rw-r--r--
phielim.go	1.47 KB	-rw-r--r--
phiopt.go	3.96 KB	-rw-r--r--
poset.go	37.23 KB	-rw-r--r--
poset_test.go	18.14 KB	-rw-r--r--
print.go	2.98 KB	-rw-r--r--
prove.go	36.68 KB	-rw-r--r--
redblack32.go	8.9 KB	-rw-r--r--
redblack32_test.go	5.96 KB	-rw-r--r--
regalloc.go	76.36 KB	-rw-r--r--
regalloc_test.go	6.41 KB	-rw-r--r--
rewrite.go	33.06 KB	-rw-r--r--
rewrite386.go	514.14 KB	-rw-r--r--
rewrite386splitload.go	3.7 KB	-rw-r--r--
rewriteAMD64.go	1.31 MB	-rw-r--r--
rewriteAMD64splitload.go	4.95 KB	-rw-r--r--
rewriteARM.go	538.26 KB	-rw-r--r--
rewriteARM64.go	837.68 KB	-rw-r--r--
rewriteMIPS.go	203.31 KB	-rw-r--r--
rewriteMIPS64.go	227.84 KB	-rw-r--r--
rewritePPC64.go	661.88 KB	-rw-r--r--
rewriteRISCV64.go	123.11 KB	-rw-r--r--
rewriteS390X.go	904.36 KB	-rw-r--r--
rewriteWasm.go	136.86 KB	-rw-r--r--
rewrite_test.go	3.01 KB	-rw-r--r--
rewritedec.go	10.56 KB	-rw-r--r--
rewritedec64.go	64.01 KB	-rw-r--r--
rewritedecArgs.go	6.6 KB	-rw-r--r--
rewritegeneric.go	1.09 MB	-rw-r--r--
schedule.go	13.99 KB	-rw-r--r--
schedule_test.go	2.91 KB	-rw-r--r--
shift_test.go	4.05 KB	-rw-r--r--
shortcircuit.go	3.97 KB	-rw-r--r--
shortcircuit_test.go	1.31 KB	-rw-r--r--
sizeof_test.go	855 B	-rw-r--r--
softfloat.go	1.94 KB	-rw-r--r--
sparsemap.go	1.98 KB	-rw-r--r--
sparseset.go	1.54 KB	-rw-r--r--
sparsetree.go	7.88 KB	-rw-r--r--
sparsetreemap.go	7.67 KB	-rw-r--r--
stackalloc.go	10.95 KB	-rw-r--r--
stackframe.go	290 B	-rw-r--r--
stmtlines_test.go	2.75 KB	-rw-r--r--
tighten.go	4.21 KB	-rw-r--r--
trim.go	4.24 KB	-rw-r--r--
value.go	10.71 KB	-rw-r--r--
writebarrier.go	17.92 KB	-rw-r--r--
writebarrier_test.go	1.75 KB	-rw-r--r--
xposmap.go	3.29 KB	-rw-r--r--
zcse.go	2.12 KB	-rw-r--r--
zeroextension_test.go	1.66 KB	-rw-r--r--

Code Editor : config.go

// Copyright 2015 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 ssa

import (
	"cmd/compile/internal/types"
	"cmd/internal/obj"
	"cmd/internal/objabi"
	"cmd/internal/src"
)

// A Config holds readonly compilation information.
// It is created once, early during compilation,
// and shared across all compilations.
type Config struct {
	arch           string // "amd64", etc.
	PtrSize        int64  // 4 or 8; copy of cmd/internal/sys.Arch.PtrSize
	RegSize        int64  // 4 or 8; copy of cmd/internal/sys.Arch.RegSize
	Types          Types
	lowerBlock     blockRewriter // lowering function
	lowerValue     valueRewriter // lowering function
	splitLoad      valueRewriter // function for splitting merged load ops; only used on some architectures
	registers      []Register    // machine registers
	gpRegMask      regMask       // general purpose integer register mask
	fpRegMask      regMask       // floating point register mask
	fp32RegMask    regMask       // floating point register mask
	fp64RegMask    regMask       // floating point register mask
	specialRegMask regMask       // special register mask
	GCRegMap       []*Register   // garbage collector register map, by GC register index
	FPReg          int8          // register number of frame pointer, -1 if not used
	LinkReg        int8          // register number of link register if it is a general purpose register, -1 if not used
	hasGReg        bool          // has hardware g register
	ctxt           *obj.Link     // Generic arch information
	optimize       bool          // Do optimization
	noDuffDevice   bool          // Don't use Duff's device
	useSSE         bool          // Use SSE for non-float operations
	useAvg         bool          // Use optimizations that need Avg* operations
	useHmul        bool          // Use optimizations that need Hmul* operations
	use387         bool          // GO386=387
	SoftFloat      bool          //
	Race           bool          // race detector enabled
	NeedsFpScratch bool          // No direct move between GP and FP register sets
	BigEndian      bool          //
	UseFMA         bool          // Use hardware FMA operation
}

type (
	blockRewriter func(*Block) bool
	valueRewriter func(*Value) bool
)

type Types struct {
	Bool       *types.Type
	Int8       *types.Type
	Int16      *types.Type
	Int32      *types.Type
	Int64      *types.Type
	UInt8      *types.Type
	UInt16     *types.Type
	UInt32     *types.Type
	UInt64     *types.Type
	Int        *types.Type
	Float32    *types.Type
	Float64    *types.Type
	UInt       *types.Type
	Uintptr    *types.Type
	String     *types.Type
	BytePtr    *types.Type // TODO: use unsafe.Pointer instead?
	Int32Ptr   *types.Type
	UInt32Ptr  *types.Type
	IntPtr     *types.Type
	UintptrPtr *types.Type
	Float32Ptr *types.Type
	Float64Ptr *types.Type
	BytePtrPtr *types.Type
}

// NewTypes creates and populates a Types.
func NewTypes() *Types {
	t := new(Types)
	t.SetTypPtrs()
	return t
}

// SetTypPtrs populates t.
func (t *Types) SetTypPtrs() {
	t.Bool = types.Types[types.TBOOL]
	t.Int8 = types.Types[types.TINT8]
	t.Int16 = types.Types[types.TINT16]
	t.Int32 = types.Types[types.TINT32]
	t.Int64 = types.Types[types.TINT64]
	t.UInt8 = types.Types[types.TUINT8]
	t.UInt16 = types.Types[types.TUINT16]
	t.UInt32 = types.Types[types.TUINT32]
	t.UInt64 = types.Types[types.TUINT64]
	t.Int = types.Types[types.TINT]
	t.Float32 = types.Types[types.TFLOAT32]
	t.Float64 = types.Types[types.TFLOAT64]
	t.UInt = types.Types[types.TUINT]
	t.Uintptr = types.Types[types.TUINTPTR]
	t.String = types.Types[types.TSTRING]
	t.BytePtr = types.NewPtr(types.Types[types.TUINT8])
	t.Int32Ptr = types.NewPtr(types.Types[types.TINT32])
	t.UInt32Ptr = types.NewPtr(types.Types[types.TUINT32])
	t.IntPtr = types.NewPtr(types.Types[types.TINT])
	t.UintptrPtr = types.NewPtr(types.Types[types.TUINTPTR])
	t.Float32Ptr = types.NewPtr(types.Types[types.TFLOAT32])
	t.Float64Ptr = types.NewPtr(types.Types[types.TFLOAT64])
	t.BytePtrPtr = types.NewPtr(types.NewPtr(types.Types[types.TUINT8]))
}

type Logger interface {
	// Logf logs a message from the compiler.
	Logf(string, ...interface{})

// Log reports whether logging is not a no-op
	// some logging calls account for more than a few heap allocations.
	Log() bool

// Fatal reports a compiler error and exits.
	Fatalf(pos src.XPos, msg string, args ...interface{})

// Warnl writes compiler messages in the form expected by "errorcheck" tests
	Warnl(pos src.XPos, fmt_ string, args ...interface{})

// Forwards the Debug flags from gc
	Debug_checknil() bool
}

type Frontend interface {
	CanSSA(t *types.Type) bool

Logger

// StringData returns a symbol pointing to the given string's contents.
	StringData(string) interface{} // returns *gc.Sym

// Auto returns a Node for an auto variable of the given type.
	// The SSA compiler uses this function to allocate space for spills.
	Auto(src.XPos, *types.Type) GCNode

// Given the name for a compound type, returns the name we should use
	// for the parts of that compound type.
	SplitString(LocalSlot) (LocalSlot, LocalSlot)
	SplitInterface(LocalSlot) (LocalSlot, LocalSlot)
	SplitSlice(LocalSlot) (LocalSlot, LocalSlot, LocalSlot)
	SplitComplex(LocalSlot) (LocalSlot, LocalSlot)
	SplitStruct(LocalSlot, int) LocalSlot
	SplitArray(LocalSlot) LocalSlot              // array must be length 1
	SplitInt64(LocalSlot) (LocalSlot, LocalSlot) // returns (hi, lo)

// DerefItab dereferences an itab function
	// entry, given the symbol of the itab and
	// the byte offset of the function pointer.
	// It may return nil.
	DerefItab(sym *obj.LSym, offset int64) *obj.LSym

// Line returns a string describing the given position.
	Line(src.XPos) string

// AllocFrame assigns frame offsets to all live auto variables.
	AllocFrame(f *Func)

// Syslook returns a symbol of the runtime function/variable with the
	// given name.
	Syslook(string) *obj.LSym

// UseWriteBarrier reports whether write barrier is enabled
	UseWriteBarrier() bool

// SetWBPos indicates that a write barrier has been inserted
	// in this function at position pos.
	SetWBPos(pos src.XPos)
}

// interface used to hold a *gc.Node (a stack variable).
// We'd use *gc.Node directly but that would lead to an import cycle.
type GCNode interface {
	Typ() *types.Type
	String() string
	IsSynthetic() bool
	IsAutoTmp() bool
	StorageClass() StorageClass
}

type StorageClass uint8

const (
	ClassAuto     StorageClass = iota // local stack variable
	ClassParam                        // argument
	ClassParamOut                     // return value
)

// NewConfig returns a new configuration object for the given architecture.
func NewConfig(arch string, types Types, ctxt *obj.Link, optimize bool) *Config {
	c := &Config{arch: arch, Types: types}
	c.useAvg = true
	c.useHmul = true
	switch arch {
	case "amd64":
		c.PtrSize = 8
		c.RegSize = 8
		c.lowerBlock = rewriteBlockAMD64
		c.lowerValue = rewriteValueAMD64
		c.splitLoad = rewriteValueAMD64splitload
		c.registers = registersAMD64[:]
		c.gpRegMask = gpRegMaskAMD64
		c.fpRegMask = fpRegMaskAMD64
		c.FPReg = framepointerRegAMD64
		c.LinkReg = linkRegAMD64
		c.hasGReg = false
	case "386":
		c.PtrSize = 4
		c.RegSize = 4
		c.lowerBlock = rewriteBlock386
		c.lowerValue = rewriteValue386
		c.splitLoad = rewriteValue386splitload
		c.registers = registers386[:]
		c.gpRegMask = gpRegMask386
		c.fpRegMask = fpRegMask386
		c.FPReg = framepointerReg386
		c.LinkReg = linkReg386
		c.hasGReg = false
	case "arm":
		c.PtrSize = 4
		c.RegSize = 4
		c.lowerBlock = rewriteBlockARM
		c.lowerValue = rewriteValueARM
		c.registers = registersARM[:]
		c.gpRegMask = gpRegMaskARM
		c.fpRegMask = fpRegMaskARM
		c.FPReg = framepointerRegARM
		c.LinkReg = linkRegARM
		c.hasGReg = true
	case "arm64":
		c.PtrSize = 8
		c.RegSize = 8
		c.lowerBlock = rewriteBlockARM64
		c.lowerValue = rewriteValueARM64
		c.registers = registersARM64[:]
		c.gpRegMask = gpRegMaskARM64
		c.fpRegMask = fpRegMaskARM64
		c.FPReg = framepointerRegARM64
		c.LinkReg = linkRegARM64
		c.hasGReg = true
		c.noDuffDevice = objabi.GOOS == "darwin" // darwin linker cannot handle BR26 reloc with non-zero addend
	case "ppc64":
		c.BigEndian = true
		fallthrough
	case "ppc64le":
		c.PtrSize = 8
		c.RegSize = 8
		c.lowerBlock = rewriteBlockPPC64
		c.lowerValue = rewriteValuePPC64
		c.registers = registersPPC64[:]
		c.gpRegMask = gpRegMaskPPC64
		c.fpRegMask = fpRegMaskPPC64
		c.FPReg = framepointerRegPPC64
		c.LinkReg = linkRegPPC64
		c.noDuffDevice = true // TODO: Resolve PPC64 DuffDevice (has zero, but not copy)
		c.hasGReg = true
	case "mips64":
		c.BigEndian = true
		fallthrough
	case "mips64le":
		c.PtrSize = 8
		c.RegSize = 8
		c.lowerBlock = rewriteBlockMIPS64
		c.lowerValue = rewriteValueMIPS64
		c.registers = registersMIPS64[:]
		c.gpRegMask = gpRegMaskMIPS64
		c.fpRegMask = fpRegMaskMIPS64
		c.specialRegMask = specialRegMaskMIPS64
		c.FPReg = framepointerRegMIPS64
		c.LinkReg = linkRegMIPS64
		c.hasGReg = true
	case "s390x":
		c.PtrSize = 8
		c.RegSize = 8
		c.lowerBlock = rewriteBlockS390X
		c.lowerValue = rewriteValueS390X
		c.registers = registersS390X[:]
		c.gpRegMask = gpRegMaskS390X
		c.fpRegMask = fpRegMaskS390X
		c.FPReg = framepointerRegS390X
		c.LinkReg = linkRegS390X
		c.hasGReg = true
		c.noDuffDevice = true
		c.BigEndian = true
	case "mips":
		c.BigEndian = true
		fallthrough
	case "mipsle":
		c.PtrSize = 4
		c.RegSize = 4
		c.lowerBlock = rewriteBlockMIPS
		c.lowerValue = rewriteValueMIPS
		c.registers = registersMIPS[:]
		c.gpRegMask = gpRegMaskMIPS
		c.fpRegMask = fpRegMaskMIPS
		c.specialRegMask = specialRegMaskMIPS
		c.FPReg = framepointerRegMIPS
		c.LinkReg = linkRegMIPS
		c.hasGReg = true
		c.noDuffDevice = true
	case "riscv64":
		c.PtrSize = 8
		c.RegSize = 8
		c.lowerBlock = rewriteBlockRISCV64
		c.lowerValue = rewriteValueRISCV64
		c.registers = registersRISCV64[:]
		c.gpRegMask = gpRegMaskRISCV64
		c.fpRegMask = fpRegMaskRISCV64
		c.FPReg = framepointerRegRISCV64
		c.hasGReg = true
	case "wasm":
		c.PtrSize = 8
		c.RegSize = 8
		c.lowerBlock = rewriteBlockWasm
		c.lowerValue = rewriteValueWasm
		c.registers = registersWasm[:]
		c.gpRegMask = gpRegMaskWasm
		c.fpRegMask = fpRegMaskWasm
		c.fp32RegMask = fp32RegMaskWasm
		c.fp64RegMask = fp64RegMaskWasm
		c.FPReg = framepointerRegWasm
		c.LinkReg = linkRegWasm
		c.hasGReg = true
		c.noDuffDevice = true
		c.useAvg = false
		c.useHmul = false
	default:
		ctxt.Diag("arch %s not implemented", arch)
	}
	c.ctxt = ctxt
	c.optimize = optimize
	c.useSSE = true
	c.UseFMA = true

// On Plan 9, floating point operations are not allowed in note handler.
	if objabi.GOOS == "plan9" {
		// Don't use FMA on Plan 9
		c.UseFMA = false

// Don't use Duff's device and SSE on Plan 9 AMD64.
		if arch == "amd64" {
			c.noDuffDevice = true
			c.useSSE = false
		}
	}

if ctxt.Flag_shared {
		// LoweredWB is secretly a CALL and CALLs on 386 in
		// shared mode get rewritten by obj6.go to go through
		// the GOT, which clobbers BX.
		opcodeTable[Op386LoweredWB].reg.clobbers |= 1 << 3 // BX
	}

// Create the GC register map index.
	// TODO: This is only used for debug printing. Maybe export config.registers?
	gcRegMapSize := int16(0)
	for _, r := range c.registers {
		if r.gcNum+1 > gcRegMapSize {
			gcRegMapSize = r.gcNum + 1
		}
	}
	c.GCRegMap = make([]*Register, gcRegMapSize)
	for i, r := range c.registers {
		if r.gcNum != -1 {
			c.GCRegMap[r.gcNum] = &c.registers[i]
		}
	}

return c
}

func (c *Config) Set387(b bool) {
	c.NeedsFpScratch = b
	c.use387 = b
}

func (c *Config) Ctxt() *obj.Link { return c.ctxt }

${this.title}

Code Editor : config.go