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Add explicit null checks after string conversions in the shells.

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This fixes issue 224.
Review URL: http://codereview.chromium.org/20081

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1233 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
ager@chromium.org 2009-02-05 13:53:41 +00:00
parent b0e3ee6274
commit 05a56bf1ea
3 changed files with 46 additions and 18 deletions
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6
include/v8.h
View File

@ -859,7 +859,7 @@ class EXPORT String : public Primitive {
public:
explicit Utf8Value(Handle<v8::Value> obj);
~Utf8Value();
char* operator*() { return str_; }
char* operator*() const { return str_; }
int length() { return length_; }
private:
char* str_;
@ -878,7 +878,7 @@ class EXPORT String : public Primitive {
public:
explicit AsciiValue(Handle<v8::Value> obj);
~AsciiValue();
char* operator*() { return str_; }
char* operator*() const { return str_; }
int length() { return length_; }
private:
char* str_;
@ -896,7 +896,7 @@ class EXPORT String : public Primitive {
public:
explicit Value(Handle<v8::Value> obj);
~Value();
uint16_t* operator*() { return str_; }
uint16_t* operator*() const { return str_; }
int length() { return length_; }
private:
uint16_t* str_;

24
samples/shell.cc
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@ -99,6 +99,12 @@ int main(int argc, char* argv[]) {
}
// Extracts a C string from a V8 Utf8Value.
const char* ToCString(const v8::String::Utf8Value& value) {
return *value ? *value : "<string conversion failed>";
}
// The callback that is invoked by v8 whenever the JavaScript 'print'
// function is called. Prints its arguments on stdout separated by
// spaces and ending with a newline.
@ -112,7 +118,8 @@ v8::Handle<v8::Value> Print(const v8::Arguments& args) {
printf(" ");
}
v8::String::Utf8Value str(args[i]);
printf("%s", *str);
const char* cstr = ToCString(str);
printf("%s", cstr);
}
printf("\n");
return v8::Undefined();
@ -126,6 +133,9 @@ v8::Handle<v8::Value> Load(const v8::Arguments& args) {
for (int i = 0; i < args.Length(); i++) {
v8::HandleScope handle_scope;
v8::String::Utf8Value file(args[i]);
if (*file == NULL) {
return v8::ThrowException(v8::String::New("Error loading file"));
}
v8::Handle<v8::String> source = ReadFile(*file);
if (source.IsEmpty()) {
return v8::ThrowException(v8::String::New("Error loading file"));
@ -220,7 +230,8 @@ bool ExecuteString(v8::Handle<v8::String> source,
// If all went well and the result wasn't undefined then print
// the returned value.
v8::String::Utf8Value str(result);
printf("%s\n", *str);
const char* cstr = ToCString(str);
printf("%s\n", cstr);
}
return true;
}
@ -231,19 +242,22 @@ bool ExecuteString(v8::Handle<v8::String> source,
void ReportException(v8::TryCatch* try_catch) {
v8::HandleScope handle_scope;
v8::String::Utf8Value exception(try_catch->Exception());
const char* exception_string = ToCString(exception);
v8::Handle<v8::Message> message = try_catch->Message();
if (message.IsEmpty()) {
// V8 didn't provide any extra information about this error; just
// print the exception.
printf("%s\n", *exception);
printf("%s\n", exception_string);
} else {
// Print (filename):(line number): (message).
v8::String::Utf8Value filename(message->GetScriptResourceName());
const char* filename_string = ToCString(filename);
int linenum = message->GetLineNumber();
printf("%s:%i: %s\n", *filename, linenum, *exception);
printf("%s:%i: %s\n", filename_string, linenum, exception_string);
// Print line of source code.
v8::String::Utf8Value sourceline(message->GetSourceLine());
printf("%s\n", *sourceline);
const char* sourceline_string = ToCString(sourceline);
printf("%s\n", sourceline_string);
// Print wavy underline (GetUnderline is deprecated).
int start = message->GetStartColumn();
for (int i = 0; i < start; i++) {

34
src/d8.cc
View File

@ -93,6 +93,12 @@ Persistent<Context> Shell::utility_context_;
Persistent<Context> Shell::evaluation_context_;
// Converts a V8 value to a C string.
const char* ToCString(const v8::String::Utf8Value& value) {
return *value ? *value : "<string conversion failed>";
}
// Executes a string within the current v8 context.
bool Shell::ExecuteString(Handle<String> source,
Handle<Value> name,
@ -121,8 +127,9 @@ bool Shell::ExecuteString(Handle<String> source,
if (print_result && !result->IsUndefined()) {
// If all went well and the result wasn't undefined then print
// the returned value.
String::Utf8Value str(result);
printf("%s\n", *str);
v8::String::Utf8Value str(result);
const char* cstr = ToCString(str);
printf("%s\n", cstr);
}
return true;
}
@ -139,8 +146,9 @@ Handle<Value> Shell::Print(const Arguments& args) {
} else {
printf(" ");
}
String::Utf8Value str(args[i]);
printf("%s", *str);
v8::String::Utf8Value str(args[i]);
const char* cstr = ToCString(str);
printf("%s", cstr);
}
printf("\n");
return Undefined();
@ -151,6 +159,9 @@ Handle<Value> Shell::Load(const Arguments& args) {
for (int i = 0; i < args.Length(); i++) {
HandleScope handle_scope;
String::Utf8Value file(args[i]);
if (*file == NULL) {
return ThrowException(String::New("Error loading file"));
}
Handle<String> source = ReadFile(*file);
if (source.IsEmpty()) {
return ThrowException(String::New("Error loading file"));
@ -178,20 +189,23 @@ Handle<Value> Shell::Version(const Arguments& args) {
void Shell::ReportException(v8::TryCatch* try_catch) {
HandleScope handle_scope;
String::Utf8Value exception(try_catch->Exception());
v8::String::Utf8Value exception(try_catch->Exception());
const char* exception_string = ToCString(exception);
Handle<Message> message = try_catch->Message();
if (message.IsEmpty()) {
// V8 didn't provide any extra information about this error; just
// print the exception.
printf("%s\n", *exception);
printf("%s\n", exception_string);
} else {
// Print (filename):(line number): (message).
String::Utf8Value filename(message->GetScriptResourceName());
v8::String::Utf8Value filename(message->GetScriptResourceName());
const char* filename_string = ToCString(filename);
int linenum = message->GetLineNumber();
printf("%s:%i: %s\n", *filename, linenum, *exception);
printf("%s:%i: %s\n", filename_string, linenum, exception_string);
// Print line of source code.
String::Utf8Value sourceline(message->GetSourceLine());
printf("%s\n", *sourceline);
v8::String::Utf8Value sourceline(message->GetSourceLine());
const char* sourceline_string = ToCString(sourceline);
printf("%s\n", sourceline_string);
// Print wavy underline (GetUnderline is deprecated).
int start = message->GetStartColumn();
for (int i = 0; i < start; i++) {