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[dev.ssa] cmd/runtime: generate gc bitmaps for SSA-compiled code

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This change is all about leveraging the gc bitmap generation
that is already done by the current compiler.  We rearrange how
stack allocation is done so that we generate a variable declaration
for each spill.  We also reorganize how args/locals are recorded
during SSA.  Then we can use the existing allocauto/defframe to
allocate the stack frame and liveness to make the gc bitmaps.

With this change, stack copying works correctly and we no longer
need hacks in runtime/stack*.go to make tests work.  GC is close
to working, it just needs write barriers.

Change-Id: I990fb4e3fbe98850c6be35c3185a1c85d9e1a6ba
Reviewed-on: https://go-review.googlesource.com/13894
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
This commit is contained in:
Keith Randall 2015-08-24 02:16:19 -07:00
parent d052bbd051
commit d2107fc987
11 changed files with 128 additions and 114 deletions
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8
src/cmd/compile/internal/ssa/export_test.go
View file

@ -4,7 +4,10 @@
package ssa
import "testing"
import (
"fmt"
"testing"
)
var CheckFunc = checkFunc
var PrintFunc = printFunc
@ -24,6 +27,9 @@ type DummyFrontend struct {
func (DummyFrontend) StringData(s string) interface{} {
return nil
}
func (DummyFrontend) Auto(t Type) fmt.Stringer {
return nil
}
func (d DummyFrontend) Logf(msg string, args ...interface{}) { d.t.Logf(msg, args...) }
func (d DummyFrontend) Fatalf(msg string, args ...interface{}) { d.t.Fatalf(msg, args...) }