diff options
Diffstat (limited to 'src/cmd/9g/peep.c')
-rw-r--r-- | src/cmd/9g/peep.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/src/cmd/9g/peep.c b/src/cmd/9g/peep.c new file mode 100644 index 000000000..ec314d633 --- /dev/null +++ b/src/cmd/9g/peep.c @@ -0,0 +1,96 @@ +// Derived from Inferno utils/6c/peep.c +// http://code.google.com/p/inferno-os/source/browse/utils/6c/peep.c +// +// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved. +// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net) +// Portions Copyright © 1997-1999 Vita Nuova Limited +// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com) +// Portions Copyright © 2004,2006 Bruce Ellis +// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net) +// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others +// Portions Copyright © 2009 The Go Authors. All rights reserved. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +#include <u.h> +#include <libc.h> +#include "gg.h" +#include "opt.h" + +void +peep(Prog *p) +{ + USED(p); + // TODO(minux) + return; +} + +void +excise(Flow *r) +{ + Prog *p, *l; + + p = r->prog; + if(debug['P'] && debug['v']) + print("%P ===delete===\n", p); + l = p->link; + *p = zprog; + p->as = ANOP; + p->link = l; + ostats.ndelmov++; +} + +int +regtyp(Adr *a) +{ + switch(a->type) { + default: + return 0; + case D_REG: + case D_FREG: + return 1; + } +} + +int +sameaddr(Addr *a, Addr *v) +{ + if(a->type != v->type) + return 0; + if(regtyp(v) && a->reg == v->reg) + return 1; + if(v->type == D_AUTO || v->type == D_PARAM) + if(v->offset == a->offset) + return 1; + return 0; +} + +int +smallindir(Addr *a, Addr *reg) +{ + return reg->type == D_REG && a->type == D_OREG && + a->reg == reg->reg && + 0 <= a->offset && a->offset < 4096; +} + +int +stackaddr(Addr *a) +{ + return a->type == D_REG && a->reg == REGSP; +} |