Strings: Add some interpreter support (#6304)

This adds just enough support to be able to --fuzz-exec a small but realistic fuzz
testcase from Java.

To that end, just implement the minimal ops we need, which are all related to
JS-style strings.

1 files changed, 31 insertions, 0 deletions

diff --git a/test/lit/exec/strings.wast b/test/lit/exec/strings.wast
index e7e31392a..711d2e36a 100644
--- a/test/lit/exec/strings.wast
+++ b/test/lit/exec/strings.wast
@@ -162,6 +162,29 @@
       (string.const "hf")
     )
   )
+
+  ;; CHECK:      [fuzz-exec] calling get_codeunit
+  ;; CHECK-NEXT: [fuzz-exec] note result: get_codeunit => 99
+  (func $get_codeunit (export "get_codeunit") (result i32)
+    ;; Reads 'c' which is code 99.
+    (stringview_wtf16.get_codeunit
+      (string.as_wtf16
+        (string.const "abcdefg")
+      )
+      (i32.const 2)
+    )
+  )
+
+  ;; CHECK:      [fuzz-exec] calling get_length
+  ;; CHECK-NEXT: [fuzz-exec] note result: get_length => 7
+  (func $get_length (export "get_length") (result i32)
+    ;; This should return 7.
+    (stringview_wtf16.length
+      (string.as_wtf16
+        (string.const "1234567")
+      )
+    )
+  )
 )
 ;; CHECK:      [fuzz-exec] calling new_wtf16_array
 ;; CHECK-NEXT: [fuzz-exec] note result: new_wtf16_array => string("ello")
@@ -213,6 +236,12 @@
 
 ;; CHECK:      [fuzz-exec] calling compare.10
 ;; CHECK-NEXT: [fuzz-exec] note result: compare.10 => -1
+
+;; CHECK:      [fuzz-exec] calling get_codeunit
+;; CHECK-NEXT: [fuzz-exec] note result: get_codeunit => 99
+
+;; CHECK:      [fuzz-exec] calling get_length
+;; CHECK-NEXT: [fuzz-exec] note result: get_length => 7
 ;; CHECK-NEXT: [fuzz-exec] comparing compare.1
 ;; CHECK-NEXT: [fuzz-exec] comparing compare.10
 ;; CHECK-NEXT: [fuzz-exec] comparing compare.2
@@ -229,4 +258,6 @@
 ;; CHECK-NEXT: [fuzz-exec] comparing eq.3
 ;; CHECK-NEXT: [fuzz-exec] comparing eq.4
 ;; CHECK-NEXT: [fuzz-exec] comparing eq.5
+;; CHECK-NEXT: [fuzz-exec] comparing get_codeunit
+;; CHECK-NEXT: [fuzz-exec] comparing get_length
 ;; CHECK-NEXT: [fuzz-exec] comparing new_wtf16_array