parser: better error message for await+tla

Bug: v8:9344, v8:6513
Change-Id: I1854e483515e7da99192367b6764a0ec7c8b41d9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2411687Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Gus Caplan <snek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70099}

src/common/message-template.h

@@ -33,6 +33,9 @@ namespace internal {
     "Derived ArrayBuffer constructor created a buffer which was too small")    \
   T(ArrayBufferSpeciesThis,                                                    \
     "ArrayBuffer subclass returned this from species constructor")             \
+  T(AwaitNotInAsyncContext,                                                    \
+    "await is only valid in async functions and the top level bodies of "      \
+    "modules")                                                                 \
   T(AwaitNotInAsyncFunction, "await is only valid in async function")          \
   T(AtomicsWaitNotAllowed, "Atomics.wait cannot be called in this context")    \
   T(BadSortComparisonFunction,                                                 \

src/parsing/parser-base.h

@@ -909,7 +909,9 @@ class ParserBase {
 
     if (scanner()->current_token() == Token::AWAIT && !is_async_function()) {
       ReportMessageAt(scanner()->location(),
-                      MessageTemplate::kAwaitNotInAsyncFunction);
+                      flags().allow_harmony_top_level_await()
+                          ? MessageTemplate::kAwaitNotInAsyncContext
+                          : MessageTemplate::kAwaitNotInAsyncFunction);
       return;
     }
 

test/cctest/interpreter/bytecode_expectations/PrivateAccessorAccess.golden

@@ -84,7 +84,7 @@ bytecodes: [
                 B(Mov), R(this), R(0),
                 B(Mov), R(context), R(2),
   /*   48 E> */ B(CallRuntime), U16(Runtime::kAddPrivateBrand), R(0), U8(3),
-  /*   53 S> */ B(Wide), B(LdaSmi), I16(267),
+  /*   53 S> */ B(Wide), B(LdaSmi), I16(268),
                 B(Star), R(3),
                 B(LdaConstant), U8(0),
                 B(Star), R(4),
@@ -115,7 +115,7 @@ bytecodes: [
                 B(Mov), R(this), R(0),
                 B(Mov), R(context), R(2),
   /*   41 E> */ B(CallRuntime), U16(Runtime::kAddPrivateBrand), R(0), U8(3),
-  /*   46 S> */ B(Wide), B(LdaSmi), I16(266),
+  /*   46 S> */ B(Wide), B(LdaSmi), I16(267),
                 B(Star), R(3),
                 B(LdaConstant), U8(0),
                 B(Star), R(4),
@@ -146,7 +146,7 @@ bytecodes: [
                 B(Mov), R(this), R(0),
                 B(Mov), R(context), R(2),
   /*   48 E> */ B(CallRuntime), U16(Runtime::kAddPrivateBrand), R(0), U8(3),
-  /*   53 S> */ B(Wide), B(LdaSmi), I16(267),
+  /*   53 S> */ B(Wide), B(LdaSmi), I16(268),
                 B(Star), R(3),
                 B(LdaConstant), U8(0),
                 B(Star), R(4),
@@ -177,7 +177,7 @@ bytecodes: [
                 B(Mov), R(this), R(0),
                 B(Mov), R(context), R(2),
   /*   41 E> */ B(CallRuntime), U16(Runtime::kAddPrivateBrand), R(0), U8(3),
-  /*   46 S> */ B(Wide), B(LdaSmi), I16(266),
+  /*   46 S> */ B(Wide), B(LdaSmi), I16(267),
                 B(Star), R(4),
                 B(LdaConstant), U8(0),
                 B(Star), R(5),

test/cctest/interpreter/bytecode_expectations/PrivateMethodAccess.golden

@@ -57,7 +57,7 @@ bytecodes: [
                 B(Mov), R(this), R(0),
                 B(Mov), R(context), R(2),
   /*   44 E> */ B(CallRuntime), U16(Runtime::kAddPrivateBrand), R(0), U8(3),
-  /*   49 S> */ B(Wide), B(LdaSmi), I16(265),
+  /*   49 S> */ B(Wide), B(LdaSmi), I16(266),
                 B(Star), R(3),
                 B(LdaConstant), U8(0),
                 B(Star), R(4),
@@ -89,7 +89,7 @@ bytecodes: [
                 B(Mov), R(this), R(0),
                 B(Mov), R(context), R(2),
   /*   44 E> */ B(CallRuntime), U16(Runtime::kAddPrivateBrand), R(0), U8(3),
-  /*   49 S> */ B(Wide), B(LdaSmi), I16(265),
+  /*   49 S> */ B(Wide), B(LdaSmi), I16(266),
                 B(Star), R(3),
                 B(LdaConstant), U8(0),
                 B(Star), R(4),

test/cctest/interpreter/bytecode_expectations/StaticPrivateMethodAccess.golden

@@ -25,7 +25,7 @@ bytecodes: [
                 B(TestReferenceEqual), R(this),
                 B(Mov), R(this), R(1),
                 B(JumpIfTrue), U8(18),
-                B(Wide), B(LdaSmi), I16(263),
+                B(Wide), B(LdaSmi), I16(264),
                 B(Star), R(2),
                 B(LdaConstant), U8(0),
                 B(Star), R(3),
@@ -56,7 +56,7 @@ frame size: 2
 parameter count: 1
 bytecode array length: 16
 bytecodes: [
-  /*   56 S> */ B(Wide), B(LdaSmi), I16(265),
+  /*   56 S> */ B(Wide), B(LdaSmi), I16(266),
                 B(Star), R(0),
                 B(LdaConstant), U8(0),
                 B(Star), R(1),
@@ -83,7 +83,7 @@ frame size: 2
 parameter count: 1
 bytecode array length: 16
 bytecodes: [
-  /*   56 S> */ B(Wide), B(LdaSmi), I16(265),
+  /*   56 S> */ B(Wide), B(LdaSmi), I16(266),
                 B(Star), R(0),
                 B(LdaConstant), U8(0),
                 B(Star), R(1),
@@ -122,7 +122,7 @@ bytecodes: [
   /*   94 E> */ B(TestReferenceEqual), R(this),
                 B(Mov), R(this), R(0),
                 B(JumpIfTrue), U8(18),
-                B(Wide), B(LdaSmi), I16(263),
+                B(Wide), B(LdaSmi), I16(264),
                 B(Star), R(2),
                 B(LdaConstant), U8(0),
                 B(Star), R(3),
@@ -144,7 +144,7 @@ bytecodes: [
   /*  109 E> */ B(TestReferenceEqual), R(this),
                 B(Mov), R(this), R(1),
                 B(JumpIfTrue), U8(18),
-                B(Wide), B(LdaSmi), I16(264),
+                B(Wide), B(LdaSmi), I16(265),
                 B(Star), R(3),
                 B(LdaConstant), U8(0),
                 B(Star), R(4),
@@ -159,7 +159,7 @@ bytecodes: [
   /*  133 E> */ B(TestReferenceEqual), R(this),
                 B(Mov), R(this), R(0),
                 B(JumpIfTrue), U8(18),
-                B(Wide), B(LdaSmi), I16(263),
+                B(Wide), B(LdaSmi), I16(264),
                 B(Star), R(2),
                 B(LdaConstant), U8(0),
                 B(Star), R(3),
@@ -189,7 +189,7 @@ frame size: 2
 parameter count: 1
 bytecode array length: 16
 bytecodes: [
-  /*   60 S> */ B(Wide), B(LdaSmi), I16(267),
+  /*   60 S> */ B(Wide), B(LdaSmi), I16(268),
                 B(Star), R(0),
                 B(LdaConstant), U8(0),
                 B(Star), R(1),
@@ -215,7 +215,7 @@ frame size: 2
 parameter count: 1
 bytecode array length: 16
 bytecodes: [
-  /*   53 S> */ B(Wide), B(LdaSmi), I16(266),
+  /*   53 S> */ B(Wide), B(LdaSmi), I16(267),
                 B(Star), R(0),
                 B(LdaConstant), U8(0),
                 B(Star), R(1),
@@ -241,7 +241,7 @@ frame size: 2
 parameter count: 1
 bytecode array length: 16
 bytecodes: [
-  /*   60 S> */ B(Wide), B(LdaSmi), I16(267),
+  /*   60 S> */ B(Wide), B(LdaSmi), I16(268),
                 B(Star), R(0),
                 B(LdaConstant), U8(0),
                 B(Star), R(1),
@@ -267,7 +267,7 @@ frame size: 3
 parameter count: 1
 bytecode array length: 16
 bytecodes: [
-  /*   46 S> */ B(Wide), B(LdaSmi), I16(266),
+  /*   46 S> */ B(Wide), B(LdaSmi), I16(267),
                 B(Star), R(1),
                 B(LdaConstant), U8(0),
                 B(Star), R(2),