Hi guys,
I'm trying to pass some string data to the JS functions, managed by V8.
These strings are UTF8-encoded and contain surrogate pairs (Emoji).
I've found, that for some reason new versions (5.1.281.56) of library
modify these strings, so
the contents of strings after conversion to std types back are not the
same, as it was initially:
#include <include/v8.h>
#include <include/libplatform/libplatform.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string>
class SampleArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
public:
virtual void* Allocate(size_t length) {
void* data = AllocateUninitialized(length);
return data == NULL ? data : memset(data, 0, length);
}
virtual void* AllocateUninitialized(size_t length) { return
malloc(length); }
virtual void Free(void* data, size_t) { free(data); }
};
int main(int argc, char* argv[]) {
v8::V8::InitializeICU();
v8::V8::InitializeExternalStartupData(argv[0]);
v8::Platform* platform = v8::platform::CreateDefaultPlatform();
v8::V8::InitializePlatform(platform);
v8::V8::Initialize();
v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
SampleArrayBufferAllocator array_buffer_allocator;
v8::Isolate::CreateParams create_params;
create_params.array_buffer_allocator = &array_buffer_allocator;
v8::Isolate* isolate = v8::Isolate::New(create_params);
{
v8::Isolate::Scope isolate_scope(isolate);
v8::HandleScope handle_scope(isolate);
// v8::Local<v8::Context> context = CreateShellContext(isolate);
// \uD83C\uDC32\
std::string src("\355\240\274\355\260\262");
std::string dst =
*v8::String::Utf8Value(
v8::String::NewFromUtf8(
isolate, src.c_str(),
v8::NewStringType::kNormal).ToLocalChecked());
if (src != dst) {
printf("!\n");
}
}
return 0;
}
Both on my x64 machine and android-19 (ARM) it prints "!".
I also want to mention, that on older versions of V8 (3.27.34) this string
stays unmodified.
Could you please describe the reasons of such behavior?
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