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[dev.ssa] cmd/compile: provide better errors for regnum and localOffset failures

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Change-Id: I2667b0923e17df7cbf08e34ebec1b69a0f2f02b2
Reviewed-on: https://go-review.googlesource.com/13265
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2015-08-05 16:06:39 -07:00
parent e5fe33e546
commit e13954981e
1 changed files with 8 additions and 2 deletions
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10
src/cmd/compile/internal/gc/ssa.go
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@ -2398,8 +2398,14 @@ func regMoveAMD64(width int64) int {
// regnum returns the register (in cmd/internal/obj numbering) to
// which v has been allocated. Panics if v is not assigned to a
// register.
// TODO: Make this panic again once it stops happening routinely.
func regnum(v *ssa.Value) int16 {
return ssaRegToReg[v.Block.Func.RegAlloc[v.ID].(*ssa.Register).Num]
reg := v.Block.Func.RegAlloc[v.ID]
if reg == nil {
v.Unimplementedf("nil regnum for value: %s\n%s\n", v.LongString(), v.Block.Func)
return 0
}
return ssaRegToReg[reg.(*ssa.Register).Num]
}
// localOffset returns the offset below the frame pointer where
@ -2410,7 +2416,7 @@ func localOffset(v *ssa.Value) int64 {
reg := v.Block.Func.RegAlloc[v.ID]
slot, ok := reg.(*ssa.LocalSlot)
if !ok {
v.Unimplementedf("localOffset of non-LocalSlot value: %s", v.LongString())
v.Unimplementedf("localOffset of non-LocalSlot value: %s\n%s\n", v.LongString(), v.Block.Func)
return 0
}
return slot.Idx