Add flag to generate PCs markers when decompiling

1 files changed, 13 insertions, 3 deletions

diff --git a/pkg/lang/vm/text/decompiler.go b/pkg/lang/vm/text/decompiler.go
index df9e1ed..ed48412 100644
--- a/pkg/lang/vm/text/decompiler.go
+++ b/pkg/lang/vm/text/decompiler.go
@@ -14,12 +14,15 @@ type Decompiler struct {
 	c code.Code
 
 	pcToLine rangemap.RangeMap[int]
+
+	generatePCs bool
 }
 
-func NewDecompiler(c code.Code) *Decompiler {
+func NewDecompiler(c code.Code, generatePCs bool) *Decompiler {
 	return &Decompiler{
-		c:        c,
-		pcToLine: rangemap.New[int](),
+		c:           c,
+		pcToLine:    rangemap.New[int](),
+		generatePCs: generatePCs,
 	}
 }
 
@@ -27,12 +30,19 @@ func (d *Decompiler) Decompile() string {
 	lines := make([]string, 0)
 	bc := d.c.Code()
 
+	longestPcStringLen := len(strconv.FormatInt(int64(len(bc)), 10))
+
 	for len(bc) != 0 {
+		startingPc := len(d.c.Code()) - len(bc)
+
 		line, rest := d.decompileInstruction(bc)
 		bc = rest
 
 		d.pcToLine.AppendToLast(d.c.Len()-len(bc), len(lines))
 
+		if d.generatePCs {
+			line = fmt.Sprintf("%*d: %s", longestPcStringLen, startingPc, line)
+		}
 		lines = append(lines, line)
 	}