[json parser] add position to error message.

R=jochen@chromium.org, verwaest@chromium.org
BUG=chromium:585724
LOG=N

Review URL: https://codereview.chromium.org/1681513002

Cr-Commit-Position: refs/heads/master@{#33864}

BUILD.gn

@@ -1130,6 +1130,7 @@ source_set("v8_base") {
     "src/isolate-inl.h",
     "src/isolate.cc",
     "src/isolate.h",
+    "src/json-parser.h",
     "src/json-stringifier.h",
     "src/key-accumulator.h",
     "src/key-accumulator.cc",
@@ -1165,7 +1166,6 @@ source_set("v8_base") {
     "src/parsing/expression-classifier.h",
     "src/parsing/func-name-inferrer.cc",
     "src/parsing/func-name-inferrer.h",
-    "src/parsing/json-parser.h",
     "src/parsing/parameter-initializer-rewriter.cc",
     "src/parsing/parameter-initializer-rewriter.h",
     "src/parsing/parser-base.h",

src/api.cc

@@ -38,8 +38,8 @@
 #include "src/global-handles.h"
 #include "src/icu_util.h"
 #include "src/isolate-inl.h"
+#include "src/json-parser.h"
 #include "src/messages.h"
-#include "src/parsing/json-parser.h"
 #include "src/parsing/parser.h"
 #include "src/parsing/scanner-character-streams.h"
 #include "src/pending-compilation-error-handler.h"

src/json-parser.h

@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef V8_PARSING_JSON_PARSER_H_
-#define V8_PARSING_JSON_PARSER_H_
+#ifndef V8_JSON_PARSER_H_
+#define V8_JSON_PARSER_H_
 
 #include "src/char-predicates.h"
 #include "src/conversions.h"
@@ -217,11 +217,12 @@ MaybeHandle<Object> JsonParser<seq_one_byte>::ParseJson() {
     // Parse failed. Current character is the unexpected token.
     Factory* factory = this->factory();
     MessageTemplate::Template message;
-    Handle<String> argument;
+    Handle<Object> arg1 = Handle<Smi>(Smi::FromInt(position_), isolate());
+    Handle<Object> arg2;
 
     switch (c0_) {
       case kEndOfString:
-        message = MessageTemplate::kUnexpectedEOS;
+        message = MessageTemplate::kJsonParseUnexpectedEOS;
         break;
       case '-':
       case '0':
@@ -234,14 +235,15 @@ MaybeHandle<Object> JsonParser<seq_one_byte>::ParseJson() {
       case '7':
       case '8':
       case '9':
-        message = MessageTemplate::kUnexpectedTokenNumber;
+        message = MessageTemplate::kJsonParseUnexpectedTokenNumber;
         break;
       case '"':
-        message = MessageTemplate::kUnexpectedTokenString;
+        message = MessageTemplate::kJsonParseUnexpectedTokenString;
         break;
       default:
-        message = MessageTemplate::kUnexpectedToken;
-        argument = factory->LookupSingleCharacterStringFromCode(c0_);
+        message = MessageTemplate::kJsonParseUnexpectedToken;
+        arg2 = arg1;
+        arg1 = factory->LookupSingleCharacterStringFromCode(c0_);
         break;
     }
 
@@ -250,7 +252,7 @@ MaybeHandle<Object> JsonParser<seq_one_byte>::ParseJson() {
     // separated source file.
     isolate()->debug()->OnCompileError(script);
     MessageLocation location(script, position_, position_ + 1);
-    Handle<Object> error = factory->NewSyntaxError(message, argument);
+    Handle<Object> error = factory->NewSyntaxError(message, arg1, arg2);
     return isolate()->template Throw<Object>(error, &location);
   }
   return result;
@@ -839,4 +841,4 @@ Handle<String> JsonParser<seq_one_byte>::ScanJsonString() {
 }  // namespace internal
 }  // namespace v8
 
-#endif  // V8_PARSING_JSON_PARSER_H_
+#endif  // V8_JSON_PARSER_H_

src/messages.h

@@ -406,6 +406,10 @@ class CallSite {
   T(InvalidLhsInPrefixOp,                                                      \
     "Invalid left-hand side expression in prefix operation")                   \
   T(InvalidRegExpFlags, "Invalid flags supplied to RegExp constructor '%'")    \
+  T(JsonParseUnexpectedEOS, "Unexpected end of JSON input")                    \
+  T(JsonParseUnexpectedToken, "Unexpected token % in JSON at position %")      \
+  T(JsonParseUnexpectedTokenNumber, "Unexpected number in JSON at position %") \
+  T(JsonParseUnexpectedTokenString, "Unexpected string in JSON at position %") \
   T(LabelRedeclaration, "Label '%' has already been declared")                 \
   T(MalformedArrowFunParamList, "Malformed arrow function parameter list")     \
   T(MalformedRegExp, "Invalid regular expression: /%/: %")                     \

src/runtime/runtime-json.cc

@@ -7,9 +7,9 @@
 #include "src/arguments.h"
 #include "src/char-predicates-inl.h"
 #include "src/isolate-inl.h"
+#include "src/json-parser.h"
 #include "src/json-stringifier.h"
 #include "src/objects-inl.h"
-#include "src/parsing/json-parser.h"
 
 namespace v8 {
 namespace internal {

test/mjsunit/messages.js

@@ -345,6 +345,26 @@ test(function() {
   eval("/a/x.test(\"a\");");
 }, "Invalid regular expression flags", SyntaxError);
 
+//kJsonParseUnexpectedEOS
+test(function() {
+  JSON.parse("{")
+}, "Unexpected end of JSON input", SyntaxError);
+
+// kJsonParseUnexpectedTokenAt
+test(function() {
+  JSON.parse("/")
+}, "Unexpected token / in JSON at position 0", SyntaxError);
+
+// kJsonParseUnexpectedTokenNumberAt
+test(function() {
+  JSON.parse("{ 1")
+}, "Unexpected number in JSON at position 2", SyntaxError);
+
+// kJsonParseUnexpectedTokenStringAt
+test(function() {
+  JSON.parse('"""')
+}, "Unexpected string in JSON at position 2", SyntaxError);
+
 // kMalformedRegExp
 test(function() {
   /(/.test("a");
@@ -355,27 +375,6 @@ test(function() {
   new Function(")", "");
 }, "Function arg string contains parenthesis", SyntaxError);
 
-// kUnexpectedEOS
-test(function() {
-  JSON.parse("{")
-}, "Unexpected end of input", SyntaxError);
-
-// kUnexpectedToken
-test(function() {
-  JSON.parse("/")
-}, "Unexpected token /", SyntaxError);
-
-// kUnexpectedTokenNumber
-test(function() {
-  JSON.parse("{ 1")
-}, "Unexpected number", SyntaxError);
-
-// kUnexpectedTokenString
-test(function() {
-  JSON.parse('"""')
-}, "Unexpected string", SyntaxError);
-
-
 // === ReferenceError ===
 
 // kNotDefined

tools/gyp/v8.gyp

@@ -952,6 +952,7 @@
         '../../src/isolate-inl.h',
         '../../src/isolate.cc',
         '../../src/isolate.h',
+        '../../src/json-parser.h',
         '../../src/json-stringifier.h',
         '../../src/key-accumulator.h',
         '../../src/key-accumulator.cc',
@@ -989,7 +990,6 @@
         '../../src/parsing/expression-classifier.h',
         '../../src/parsing/func-name-inferrer.cc',
         '../../src/parsing/func-name-inferrer.h',
-        '../../src/parsing/json-parser.h',
         '../../src/parsing/parameter-initializer-rewriter.cc',
         '../../src/parsing/parameter-initializer-rewriter.h',
         '../../src/parsing/parser-base.h',