pass: naive implementation of liveness

2018-12-02 23:59:29 -08:00
parent 7d4e18f4f4
commit b52c67f3fb
8 changed files with 1093 additions and 1000 deletions
--- a/ast.go
+++ b/ast.go
@@ -45,9 +45,13 @@ type Instruction struct {
 	// CFG.
 	Pred []*Instruction
 	Succ []*Instruction
+
+	// LiveIn/LiveOut are sets of live register IDs pre/post execution.
+	LiveIn  map[reg.ID]bool
+	LiveOut map[reg.ID]bool
 }

-func (i Instruction) node() {}
+func (i *Instruction) node() {}

 func (i Instruction) TargetLabel() *Label {
 	if !i.IsBranch {