[dev.ssa] cmd/compile: remember names of values
For debugging, spill values to named variables instead of autotmp_
variables if possible. We do this by keeping a name -> value map
for each function, keep it up-to-date during deadcode elim, and use
it to override spill decisions in stackalloc.
It might even make stack frames a bit smaller, as it makes it easy
to identify a set of spills which are likely not to interfere.
This just works for one-word variables for now. Strings/slices
will be a separate CL.
Change-Id: Ie89eba8cab16bcd41b311c479ec46dd7e64cdb67
Reviewed-on: https://go-review.googlesource.com/16336
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: David Chase <drchase@google.com>
diff --git a/src/cmd/compile/internal/ssa/value.go b/src/cmd/compile/internal/ssa/value.go
index a5915da..661a059 100644
--- a/src/cmd/compile/internal/ssa/value.go
+++ b/src/cmd/compile/internal/ssa/value.go
@@ -142,15 +142,15 @@
// ArgSymbol is an aux value that encodes an argument or result
// variable's constant offset from FP (FP = SP + framesize).
type ArgSymbol struct {
- Typ Type // Go type
- Node fmt.Stringer // A *gc.Node referring to the argument/result variable.
+ Typ Type // Go type
+ Node GCNode // A *gc.Node referring to the argument/result variable.
}
// AutoSymbol is an aux value that encodes a local variable's
// constant offset from SP.
type AutoSymbol struct {
- Typ Type // Go type
- Node fmt.Stringer // A *gc.Node referring to a local (auto) variable.
+ Typ Type // Go type
+ Node GCNode // A *gc.Node referring to a local (auto) variable.
}
func (s *ExternSymbol) String() string {
