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-rw-r--r--src/cmd/compile/internal/ssa/config.go390
1 files changed, 390 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/config.go b/src/cmd/compile/internal/ssa/config.go
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+++ b/src/cmd/compile/internal/ssa/config.go
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+// 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
+ 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) *obj.LSym
+
+ // 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)
+ SplitSlot(parent *LocalSlot, suffix string, offset int64, t *types.Type) LocalSlot
+
+ // 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)
+
+ // MyImportPath provides the import name (roughly, the package) for the function being compiled.
+ MyImportPath() string
+}
+
+// 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
+)
+
+const go116lateCallExpansion = true
+
+// LateCallExpansionEnabledWithin returns true if late call expansion should be tested
+// within compilation of a function/method.
+func LateCallExpansionEnabledWithin(f *Func) bool {
+ return go116lateCallExpansion
+}
+
+// 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" || objabi.GOOS == "ios" // 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) Ctxt() *obj.Link { return c.ctxt }
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