[Strings] Add experimental StringNew variants (#5459)

string.from_code_point makes a string from an int code point.

string.new_utf8*_try makes a utf8 string and returns null on a UTF8 encoding
error rather than trap.

1 files changed, 13 insertions, 2 deletions

diff --git a/src/passes/Print.cpp b/src/passes/Print.cpp
index d9a4c38e5..8c112d6a5 100644
--- a/src/passes/Print.cpp
+++ b/src/passes/Print.cpp
@@ -2345,7 +2345,11 @@ struct PrintExpressionContents
   void visitStringNew(StringNew* curr) {
     switch (curr->op) {
       case StringNewUTF8:
-        printMedium(o, "string.new_wtf8 utf8");
+        if (!curr->try_) {
+          printMedium(o, "string.new_wtf8 utf8");
+        } else {
+          printMedium(o, "string.new_utf8_try");
+        }
         break;
       case StringNewWTF8:
         printMedium(o, "string.new_wtf8 wtf8");
@@ -2357,7 +2361,11 @@ struct PrintExpressionContents
         printMedium(o, "string.new_wtf16");
         break;
       case StringNewUTF8Array:
-        printMedium(o, "string.new_wtf8_array utf8");
+        if (!curr->try_) {
+          printMedium(o, "string.new_wtf8_array utf8");
+        } else {
+          printMedium(o, "string.new_utf8_array_try");
+        }
         break;
       case StringNewWTF8Array:
         printMedium(o, "string.new_wtf8_array wtf8");
@@ -2368,6 +2376,9 @@ struct PrintExpressionContents
       case StringNewWTF16Array:
         printMedium(o, "string.new_wtf16_array");
         break;
+      case StringNewFromCodePoint:
+        printMedium(o, "string.from_code_point");
+        break;
       default:
         WASM_UNREACHABLE("invalid string.new*");
     }