github.com/shogo82148/std@v1.22.1-0.20240327122250-4e474527810c/cmd/compile/internal/objw/prog.go (about)

     1  // Derived from Inferno utils/6c/txt.c
     2  // https://bitbucket.org/inferno-os/inferno-os/src/master/utils/6c/txt.c
     3  //
     4  //	Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
     5  //	Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
     6  //	Portions Copyright © 1997-1999 Vita Nuova Limited
     7  //	Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
     8  //	Portions Copyright © 2004,2006 Bruce Ellis
     9  //	Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
    10  //	Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
    11  //	Portions Copyright © 2009 The Go Authors. All rights reserved.
    12  //
    13  // Permission is hereby granted, free of charge, to any person obtaining a copy
    14  // of this software and associated documentation files (the "Software"), to deal
    15  // in the Software without restriction, including without limitation the rights
    16  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    17  // copies of the Software, and to permit persons to whom the Software is
    18  // furnished to do so, subject to the following conditions:
    19  //
    20  // The above copyright notice and this permission notice shall be included in
    21  // all copies or substantial portions of the Software.
    22  //
    23  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    24  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    25  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
    26  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    27  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    28  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    29  // THE SOFTWARE.
    30  
    31  package objw
    32  
    33  import (
    34  	"github.com/shogo82148/std/cmd/compile/internal/ir"
    35  	"github.com/shogo82148/std/cmd/internal/obj"
    36  	"github.com/shogo82148/std/cmd/internal/src"
    37  )
    38  
    39  // NewProgs returns a new Progs for fn.
    40  // worker indicates which of the backend workers will use the Progs.
    41  func NewProgs(fn *ir.Func, worker int) *Progs
    42  
    43  // Progs accumulates Progs for a function and converts them into machine code.
    44  type Progs struct {
    45  	Text       *obj.Prog
    46  	Next       *obj.Prog
    47  	PC         int64
    48  	Pos        src.XPos
    49  	CurFunc    *ir.Func
    50  	Cache      []obj.Prog
    51  	CacheIndex int
    52  
    53  	NextLive StackMapIndex
    54  	PrevLive StackMapIndex
    55  
    56  	NextUnsafe bool
    57  	PrevUnsafe bool
    58  }
    59  
    60  type StackMapIndex int
    61  
    62  // StackMapDontCare indicates that the stack map index at a Value
    63  // doesn't matter.
    64  //
    65  // This is a sentinel value that should never be emitted to the PCDATA
    66  // stream. We use -1000 because that's obviously never a valid stack
    67  // index (but -1 is).
    68  const StackMapDontCare StackMapIndex = -1000
    69  
    70  func (s StackMapIndex) StackMapValid() bool
    71  
    72  func (pp *Progs) NewProg() *obj.Prog
    73  
    74  // Flush converts from pp to machine code.
    75  func (pp *Progs) Flush()
    76  
    77  // Free clears pp and any associated resources.
    78  func (pp *Progs) Free()
    79  
    80  // Prog adds a Prog with instruction As to pp.
    81  func (pp *Progs) Prog(as obj.As) *obj.Prog
    82  
    83  func (pp *Progs) Clear(p *obj.Prog)
    84  
    85  func (pp *Progs) Append(p *obj.Prog, as obj.As, ftype obj.AddrType, freg int16, foffset int64, ttype obj.AddrType, treg int16, toffset int64) *obj.Prog
    86  
    87  func (pp *Progs) SetText(fn *ir.Func)
    88  
    89  // LosesStmtMark reports whether a prog with op as loses its statement mark on the way to DWARF.
    90  // The attributes from some opcodes are lost in translation.
    91  // TODO: this is an artifact of how funcpctab combines information for instructions at a single PC.
    92  // Should try to fix it there.
    93  func LosesStmtMark(as obj.As) bool