Stowage/go
2
0
Fork 0
mirror of https://github.com/golang/go.git synced 2025-12-08 06:10:04 +00:00
Code Issues Projects Releases Packages Wiki Activity

cmd/compile/internal: pass LocalSlot values, not pointers

Browse source 
Because getStackOffset is a function pointer, the compiler assumes that
its arguments escape. Pass a value instead to avoid heap allocations.

Change-Id: Ib94e5941847f134cd00e873040a4d7fcf15ced26
Reviewed-on: https://go-review.googlesource.com/92397
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Heschi Kreinick 2018-01-29 19:21:25 -05:00
parent b8644e3243
commit 9c4fd4626c
2 changed files with 8 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

12
src/cmd/compile/internal/ssa/debug.go
View file

@ -170,7 +170,7 @@ type debugState struct {
loggingEnabled bool
cache *Cache
registers []Register
stackOffset func(*LocalSlot) int32
stackOffset func(LocalSlot) int32
// The names (slots) associated with each value, indexed by Value ID.
valueNames [][]SlotID
@ -280,7 +280,7 @@ func (s *debugState) stateString(b *BlockDebug, state stateAtPC) string {
// BuildFuncDebug returns debug information for f.
// f must be fully processed, so that each Value is where it will be when
// machine code is emitted.
func BuildFuncDebug(ctxt *obj.Link, f *Func, loggingEnabled bool, stackOffset func(*LocalSlot) int32) *FuncDebug {
func BuildFuncDebug(ctxt *obj.Link, f *Func, loggingEnabled bool, stackOffset func(LocalSlot) int32) *FuncDebug {
if f.RegAlloc == nil {
f.Fatalf("BuildFuncDebug on func %v that has not been fully processed", f)
}
@ -336,7 +336,7 @@ func BuildFuncDebug(ctxt *obj.Link, f *Func, loggingEnabled bool, stackOffset fu
}
blockLocs := state.liveness()
lists := state.buildLocationLists(ctxt, stackOffset, blockLocs)
lists := state.buildLocationLists(ctxt, blockLocs)
return &FuncDebug{
Slots: state.slots,
@ -582,7 +582,7 @@ func (state *debugState) processValue(v *Value, vSlots []SlotID, vReg *Register)
switch {
case v.Op == OpArg:
home := state.f.getHome(v.ID).(LocalSlot)
stackOffset := state.stackOffset(&home)
stackOffset := state.stackOffset(home)
for _, slot := range vSlots {
if state.loggingEnabled {
state.logf("at %v: arg %v now on stack in location %v\n", v.ID, state.slots[slot], home)
@ -596,7 +596,7 @@ func (state *debugState) processValue(v *Value, vSlots []SlotID, vReg *Register)
case v.Op == OpStoreReg:
home := state.f.getHome(v.ID).(LocalSlot)
stackOffset := state.stackOffset(&home)
stackOffset := state.stackOffset(home)
for _, slot := range vSlots {
last := locs.slots[slot]
if last.absent() {
@ -721,7 +721,7 @@ func firstReg(set RegisterSet) uint8 {
// The returned location lists are not fully complete. They are in terms of
// SSA values rather than PCs, and have no base address/end entries. They will
// be finished by PutLocationList.
func (state *debugState) buildLocationLists(Ctxt *obj.Link, stackOffset func(*LocalSlot) int32, blockLocs []*BlockDebug) [][]byte {
func (state *debugState) buildLocationLists(Ctxt *obj.Link, blockLocs []*BlockDebug) [][]byte {
lists := make([][]byte, len(state.vars))
pendingEntries := state.cache.pendingEntries