Added built-in support for unsafe.SliceData

grantnelson-wf · grantnelson-wf · commit d1eb76f68b77 · 2024-04-25T12:46:21.000-06:00
diff --git a/compiler/expressions.go b/compiler/expressions.go
@@ -1058,6 +1058,12 @@ func (fc *funcContext) translateBuiltin(name string, sig *types.Signature, args
 	case "Offsetof":
 		sel, _ := fc.selectionOf(astutil.RemoveParens(args[0]).(*ast.SelectorExpr))
 		return fc.formatExpr("%d", typesutil.OffsetOf(sizes32, sel))
+	case "SliceData":
+		// SliceData returns nil if the slice is nil, otherwise returns a pointer to the first index of the array, &s[0].
+		// If the slice is empty (cap == 0), it returns an "unspecified memory address" or in our case, a pointer to the empty array.
+		t := fc.typeOf(args[0]).Underlying().(*types.Slice)
+		elemPtrType := types.NewPointer(t.Elem())
+		return fc.formatExpr("(%1e === %2s.nil) ? %3s.nil : $indexPtr(%1e.$array, %1e.$offset, %3s)", args[0], fc.typeName(t), fc.typeName(elemPtrType))
 	default:
 		panic(fmt.Sprintf("Unhandled builtin: %s\n", name))
 	}
