[stringref] Add tests that stringrefs are unsupported by default

Bug: v8:12868
Change-Id: I9008da5f89c4c18ea45ddbe44cae832087c76b01
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3647349
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Andy Wingo <wingo@igalia.com>
Cr-Commit-Position: refs/heads/main@{#80523}

test/mjsunit/wasm/stringrefs-invalid.js

@@ -0,0 +1,45 @@
+// Copyright 2022 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --expose-wasm --experimental-wasm-eh --experimental-wasm-gc
+
+d8.file.execute("test/mjsunit/wasm/wasm-module-builder.js");
+
+function assertInvalid(fn, message) {
+  let builder = new WasmModuleBuilder();
+  fn(builder);
+  assertThrows(() => builder.toModule(), WebAssembly.CompileError,
+               `WebAssembly.Module(): ${message}`);
+}
+
+let kStringSectionCodeStr = '0x0' + kStringRefSectionCode.toString(16);
+assertInvalid(builder => builder.addLiteralStringRef("foo"),
+              `unknown section code #${kStringSectionCodeStr} @+10`);
+
+for (let [name, code] of [['string', kWasmStringRef],
+                          ['stringview_wtf8', kWasmStringViewWtf8],
+                          ['stringview_wtf16', kWasmStringViewWtf16],
+                          ['stringview_iter', kWasmStringViewIter]]) {
+  let message = `invalid value type 0x${(code & kLeb128Mask).toString(16)}`;
+  let default_init = WasmInitExpr.RefNull(code);
+
+  assertInvalid(b => b.addType(makeSig([code], [])),
+                `${message} @+13`);
+  assertInvalid(b => b.addStruct([makeField(code, true)]),
+                `${message} @+13`);
+  assertInvalid(b => b.addArray(code, true),
+                `${message} @+12`);
+  assertInvalid(b => b.addType(makeSig([], [code])),
+                `${message} @+14`);
+  assertInvalid(b => b.addGlobal(code, true, default_init),
+                `${message} @+11`);
+  assertInvalid(b => b.addTable(code, 0),
+                `${message} @+11`);
+  assertInvalid(b => b.addPassiveElementSegment([default_init], code),
+                `${message} @+12`);
+  assertInvalid(b => b.addTag(makeSig([code], [])),
+                `${message} @+13`);
+  assertInvalid(b => b.addFunction(undefined, kSig_v_v).addLocals(code, 1),
+                `Compiling function #0 failed: ${message} @+24`);
+}

test/mjsunit/wasm/wasm-module-builder.js

@@ -68,7 +68,8 @@ let kCodeSectionCode = 10;       // Function code
 let kDataSectionCode = 11;       // Data segments
 let kDataCountSectionCode = 12;  // Data segment count (between Element & Code)
 let kTagSectionCode = 13;        // Tag section (between Memory & Global)
-let kLastKnownSectionCode = 13;
+let kStringRefSectionCode = 14;  // Stringref literals section (between Tag & Global)
+let kLastKnownSectionCode = 14;
 
 // Name section types
 let kModuleNameCode = 0;
@@ -126,7 +127,11 @@ let kWasmExternRef = kWasmAnyRef;  // Alias for test backwards compatibility.
 let kWasmEqRef = -0x13;
 let kWasmI31Ref = -0x16;
 let kWasmDataRef = -0x19;
-let kWasmArrayRef = -0x20;
+let kWasmArrayRef = -0x1a;
+let kWasmStringRef = -0x1b;
+let kWasmStringViewWtf8 = -0x1c;
+let kWasmStringViewWtf16 = -0x1d;
+let kWasmStringViewIter = -0x1e;
 
 // Use the positive-byte versions inside function bodies.
 let kLeb128Mask = 0x7f;
@@ -138,6 +143,10 @@ let kEqRefCode = kWasmEqRef & kLeb128Mask;
 let kI31RefCode = kWasmI31Ref & kLeb128Mask;
 let kDataRefCode = kWasmDataRef & kLeb128Mask;
 let kArrayRefCode = kWasmArrayRef & kLeb128Mask;
+let kStringRefCode = kWasmStringRef & kLeb128Mask;
+let kStringViewWtf8Code = kWasmStringViewWtf8 & kLeb128Mask;
+let kStringViewWtf16Code = kWasmStringViewWtf16 & kLeb128Mask;
+let kStringViewIterCode = kWasmStringViewIter & kLeb128Mask;
 
 let kWasmOptRef = 0x6c;
 let kWasmRef = 0x6b;
@@ -523,6 +532,31 @@ let kExprBrOnNonFunc = 0x63;
 let kExprBrOnNonData = 0x64;
 let kExprBrOnNonI31 = 0x65;
 let kExprBrOnNonArray = 0x67;
+let kStringNewWtf8 = 0x80;
+let kStringNewWtf16 = 0x81;
+let kStringConst = 0x82;
+let kStringMeasureUtf8 = 0x83;
+let kStringMeasureWtf8 = 0x84;
+let kStringMeasureWtf16 = 0x85;
+let kStringEncodeWtf8 = 0x86;
+let kStringEncodeWtf16 = 0x87;
+let kStringConcat = 0x88;
+let kStringEq = 0x89;
+let kStringIsUsvSequence = 0x8a;
+let kStringAsWtf8 = 0x90;
+let kStringViewWtf8Advance = 0x91;
+let kStringViewWtf8Encode = 0x92;
+let kStringViewWtf8Slice = 0x93;
+let kStringAsWtf16 = 0x98;
+let kStringViewWtf16Length = 0x99;
+let kStringViewWtf16GetCodeunit = 0x9a;
+let kStringViewWtf16Encode = 0x9b;
+let kStringViewWtf16Slice = 0x9c;
+let kStringAsIter = 0xa0;
+let kStringViewIterCur = 0xa1
+let kStringViewIterAdvance = 0xa2;
+let kStringViewIterRewind = 0xa3
+let kStringViewIterSlice = 0xa4;
 
 // Numeric opcodes.
 let kExprI32SConvertSatF32 = 0x00;
@@ -1396,6 +1430,7 @@ class WasmModuleBuilder {
     this.types = [];
     this.imports = [];
     this.exports = [];
+    this.stringrefs = [];
     this.globals = [];
     this.tables = [];
     this.tags = [];
@@ -1478,6 +1513,11 @@ class WasmModuleBuilder {
     return this.types.length - 1;
   }
 
+  addLiteralStringRef(str) {
+    this.stringrefs.push(str);
+    return this.stringrefs.length - 1;
+  }
+
   addStruct(fields, supertype_idx = kNoSuperType) {
     this.types.push(new WasmStruct(fields, supertype_idx));
     return this.types.length - 1;
@@ -1901,6 +1941,17 @@ class WasmModuleBuilder {
       });
     }
 
+    // Add stringref section.
+    if (wasm.stringrefs.length > 0) {
+      if (debug) print('emitting stringrefs @ ' + binary.length);
+      binary.emit_section(kStringRefSectionCode, section => {
+        section.emit_u32v(wasm.stringrefs.length);
+        for (let str of wasm.stringrefs) {
+          section.emit_string(str);
+        }
+      });
+    }
+
     // Add global section.
     if (wasm.globals.length > 0) {
       if (debug) print('emitting globals @ ' + binary.length);