diff options
Diffstat (limited to 'src/cmd/internal/obj/link.go')
| -rw-r--r-- | src/cmd/internal/obj/link.go | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/src/cmd/internal/obj/link.go b/src/cmd/internal/obj/link.go index 1fc90db864..1d4217b5f5 100644 --- a/src/cmd/internal/obj/link.go +++ b/src/cmd/internal/obj/link.go @@ -237,6 +237,19 @@ const ( TYPE_REGLIST ) +func (a *Addr) Target() *Prog { + if a.Type == TYPE_BRANCH && a.Val != nil { + return a.Val.(*Prog) + } + return nil +} +func (a *Addr) SetTarget(t *Prog) { + if a.Type != TYPE_BRANCH { + panic("setting branch target when type is not TYPE_BRANCH") + } + a.Val = t +} + // Prog describes a single machine instruction. // // The general instruction form is: @@ -255,7 +268,7 @@ const ( // to avoid too much changes in a single swing. // (1) scheme is enough to express any kind of operand combination. // -// Jump instructions use the Pcond field to point to the target instruction, +// Jump instructions use the To.Val field to point to the target *Prog, // which must be in the same linked list as the jump instruction. // // The Progs for a given function are arranged in a list linked through the Link field. @@ -274,7 +287,7 @@ type Prog struct { From Addr // first source operand RestArgs []Addr // can pack any operands that not fit into {Prog.From, Prog.To} To Addr // destination operand (second is RegTo2 below) - Pcond *Prog // target of conditional jump + Pool *Prog // constant pool entry, for arm,arm64 back ends Forwd *Prog // for x86 back end Rel *Prog // for x86, arm back ends Pc int64 // for back ends or assembler: virtual or actual program counter, depending on phase |