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Buffers instances can have arbitrary alignment. `node-ffi` depends on this. Add some regression tests to ensure we don't break this in the future. PR-URL: https://github.com/nodejs/node/pull/5752 Reviewed-By: trevnorris - Trevor Norris <trev.norris@gmail.com> Reviewed-By: bnoordhuis - Ben Noordhuis <info@bnoordhuis.nl>
44 lines
1.1 KiB
C++
44 lines
1.1 KiB
C++
#include <node.h>
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#include <node_buffer.h>
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#include <util.h>
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#include <v8.h>
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static int alive;
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static char buf[1024];
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static void FreeCallback(char* data, void* hint) {
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alive--;
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}
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void Alloc(const v8::FunctionCallbackInfo<v8::Value>& args) {
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v8::Isolate* isolate = args.GetIsolate();
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alive++;
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uintptr_t alignment = args[1]->IntegerValue();
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uintptr_t offset = args[2]->IntegerValue();
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uintptr_t static_offset = reinterpret_cast<uintptr_t>(buf) % alignment;
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char* aligned = buf + (alignment - static_offset) + offset;
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args.GetReturnValue().Set(node::Buffer::New(
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isolate,
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aligned,
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args[0]->IntegerValue(),
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FreeCallback,
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nullptr).ToLocalChecked());
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}
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void Check(const v8::FunctionCallbackInfo<v8::Value>& args) {
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v8::Isolate* isolate = args.GetIsolate();
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isolate->RequestGarbageCollectionForTesting(
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v8::Isolate::kFullGarbageCollection);
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CHECK_GT(alive, 0);
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}
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void init(v8::Local<v8::Object> target) {
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NODE_SET_METHOD(target, "alloc", Alloc);
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NODE_SET_METHOD(target, "check", Check);
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}
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NODE_MODULE(binding, init);
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