[JSC] fix wrong text in WASM error message

https://bugs.webkit.org/show_bug.cgi?id=247280
rdar://101023980

Reviewed by Yusuke Suzuki.

Fix WASM error message for `local.get`.

* JSTests/stress/wasm-error-message-get-local.js: Added.
(shouldBe):
(async let):
* Source/JavaScriptCore/wasm/WasmFunctionParser.h:
(JSC::Wasm::FunctionParser<Context>::parseIndexForLocal):

Canonical link: https://commits.webkit.org/256176@main

JSTests/stress/wasm-error-message-get-local.js

@@ -0,0 +1,23 @@
+function shouldBe(actual, expected) {
+    if (actual !== expected)
+        throw new Error('bad value: ' + actual);
+}
+
+const log = globalThis.console?.log ?? debug;
+
+let expected = "--> CompileError: WebAssembly.Module doesn't validate: attempt to use unknown local 5, the number of locals is 5, in function at index 0";
+
+/*
+(module
+  (type (;0;) (func (result i64)))
+  (func (;0;) (type 0) (result i64)
+    (local i64 i64 i64 i64 i64)
+    local.get 5))
+*/
+
+(async function () {
+    let bytes = new Uint8Array([0x0, 0x61, 0x73, 0x6d, 0x1, 0x0, 0x0, 0x0, 0x1, 0x5, 0x1, 0x60, 0x0, 0x1, 0x7e, 0x3, 0x2, 0x1, 0x0, 0xa, 0x8, 0x1, 0x6, 0x1, 0x5, 0x7e, 0x20, 0x5, 0xb]);
+    await WebAssembly.instantiate(bytes, {});
+})()
+    .then(() => log('bye'))
+    .catch(e => shouldBe(e, expected));

Source/JavaScriptCore/wasm/WasmFunctionParser.h

@@ -1078,7 +1078,7 @@ auto FunctionParser<Context>::parseIndexForLocal(uint32_t& resultIndex) -> Parti
 {
     uint32_t index;
     WASM_PARSER_FAIL_IF(!parseVarUInt32(index), "can't get index for local");
-    WASM_VALIDATOR_FAIL_IF(index >= m_locals.size(), "attempt to use unknown local ", index, " last one is ", m_locals.size());
+    WASM_VALIDATOR_FAIL_IF(index >= m_locals.size(), "attempt to use unknown local ", index, ", the number of locals is ", m_locals.size());
     resultIndex = index;
     return { };
 }
@@ -1927,7 +1927,7 @@ FOR_EACH_WASM_MEMORY_STORE_OP(CREATE_CASE)
 
         TypedExpression value;
         WASM_TRY_POP_EXPRESSION_STACK_INTO(value, "set_local");
-        WASM_VALIDATOR_FAIL_IF(index >= m_locals.size(), "attempt to set unknown local ", index, " last one is ", m_locals.size());
+        WASM_VALIDATOR_FAIL_IF(index >= m_locals.size(), "attempt to set unknown local ", index, ", the number of locals is ", m_locals.size());
         WASM_VALIDATOR_FAIL_IF(!isSubtype(value.type(), m_locals[index]), "set_local to type ", value.type().kind, " expected ", m_locals[index].kind);
         WASM_TRY_ADD_TO_CONTEXT(setLocal(index, value));
         return { };
@@ -1939,7 +1939,7 @@ FOR_EACH_WASM_MEMORY_STORE_OP(CREATE_CASE)
 
         WASM_PARSER_FAIL_IF(m_expressionStack.isEmpty(), "can't tee_local on empty expression stack");
         TypedExpression value = m_expressionStack.last();
-        WASM_VALIDATOR_FAIL_IF(index >= m_locals.size(), "attempt to tee unknown local ", index, " last one is ", m_locals.size());
+        WASM_VALIDATOR_FAIL_IF(index >= m_locals.size(), "attempt to tee unknown local ", index, ", the number of locals is ", m_locals.size());
         WASM_VALIDATOR_FAIL_IF(!isSubtype(value.type(), m_locals[index]), "set_local to type ", value.type().kind, " expected ", m_locals[index].kind);
         WASM_TRY_ADD_TO_CONTEXT(setLocal(index, value));
         return { };