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// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "tools/v8windbg/src/list-chunks.h"
#include "tools/v8windbg/src/cur-isolate.h"
// v8windbg!ListChunksAlias::Call
IFACEMETHODIMP ListChunksAlias::Call(IModelObject* p_context_object,
ULONG64 arg_count,
_In_reads_(arg_count)
IModelObject** pp_arguments,
IModelObject** pp_result,
IKeyStore** pp_metadata) noexcept {
WRL::ComPtr<IDebugHostContext> sp_ctx;
RETURN_IF_FAIL(sp_debug_host->GetCurrentContext(&sp_ctx));
WRL::ComPtr<IModelObject> result;
RETURN_IF_FAIL(
sp_data_model_manager->CreateSyntheticObject(sp_ctx.Get(), &result));
auto sp_iterator{WRL::Make<MemoryChunks>()};
RETURN_IF_FAIL(result->SetConcept(
__uuidof(IIndexableConcept),
static_cast<IIndexableConcept*>(sp_iterator.Get()), nullptr));
RETURN_IF_FAIL(result->SetConcept(
__uuidof(IIterableConcept),
static_cast<IIterableConcept*>(sp_iterator.Get()), nullptr));
*pp_result = result.Detach();
if (pp_metadata) {
*pp_metadata = nullptr;
}
return S_OK;
}
ChunkData::ChunkData() = default;
ChunkData::~ChunkData() = default;
ChunkData::ChunkData(const ChunkData&) = default;
ChunkData::ChunkData(ChunkData&&) = default;
ChunkData& ChunkData::operator=(const ChunkData&) = default;
ChunkData& ChunkData::operator=(ChunkData&&) = default;
MemoryChunkIterator::MemoryChunkIterator(
WRL::ComPtr<IDebugHostContext>& host_context)
: sp_ctx_(host_context) {}
MemoryChunkIterator::~MemoryChunkIterator() = default;
HRESULT MemoryChunkIterator::PopulateChunkData() {
WRL::ComPtr<IModelObject> sp_isolate, sp_heap, sp_space;
chunks_.clear();
RETURN_IF_FAIL(GetCurrentIsolate(sp_isolate));
RETURN_IF_FAIL(
sp_isolate->GetRawValue(SymbolField, L"heap_", RawSearchNone, &sp_heap));
RETURN_IF_FAIL(
sp_heap->GetRawValue(SymbolField, L"space_", RawSearchNone, &sp_space));
WRL::ComPtr<IDebugHostType> sp_space_type;
RETURN_IF_FAIL(sp_space->GetTypeInfo(&sp_space_type));
// Iterate over the array of Space pointers
WRL::ComPtr<IIterableConcept> sp_iterable;
RETURN_IF_FAIL(
sp_space->GetConcept(__uuidof(IIterableConcept), &sp_iterable, nullptr));
WRL::ComPtr<IModelIterator> sp_space_iterator;
RETURN_IF_FAIL(sp_iterable->GetIterator(sp_space.Get(), &sp_space_iterator));
// Loop through all the spaces in the array
WRL::ComPtr<IModelObject> sp_space_ptr;
while (sp_space_iterator->GetNext(&sp_space_ptr, 0, nullptr, nullptr) !=
E_BOUNDS) {
// Should have gotten a "v8::internal::Space *". Dereference, then get field
// "memory_chunk_list_" [Type: v8::base::List<v8::internal::MemoryChunk>]
WRL::ComPtr<IModelObject> sp_space, sp_chunk_list, sp_mem_chunk_ptr,
sp_mem_chunk;
RETURN_IF_FAIL(sp_space_ptr->Dereference(&sp_space));
RETURN_IF_FAIL(sp_space->GetRawValue(SymbolField, L"memory_chunk_list_",
RawSearchNone, &sp_chunk_list));
// Then get field "front_" [Type: v8::internal::MemoryChunk *]
RETURN_IF_FAIL(sp_chunk_list->GetRawValue(
SymbolField, L"front_", RawSearchNone, &sp_mem_chunk_ptr));
// Loop here on the list of MemoryChunks for the space
while (true) {
// See if it is a nullptr (i.e. no chunks in this space)
uint64_t front_val;
RETURN_IF_FAIL(
UnboxULong64(sp_mem_chunk_ptr.Get(), &front_val, true /*convert*/));
if (front_val == 0) {
break;
}
// Dereference and get fields "area_start_" and "area_end_" (both uint64)
RETURN_IF_FAIL(sp_mem_chunk_ptr->Dereference(&sp_mem_chunk));
WRL::ComPtr<IModelObject> sp_start, sp_end;
RETURN_IF_FAIL(sp_mem_chunk->GetRawValue(SymbolField, L"area_start_",
RawSearchNone, &sp_start));
RETURN_IF_FAIL(sp_mem_chunk->GetRawValue(SymbolField, L"area_end_",
RawSearchNone, &sp_end));
ChunkData chunk_entry;
chunk_entry.area_start = sp_start;
chunk_entry.area_end = sp_end;
chunk_entry.space = sp_space;
chunks_.push_back(chunk_entry);
// Follow the list_node_.next_ to the next memory chunk
WRL::ComPtr<IModelObject> sp_list_node;
RETURN_IF_FAIL(sp_mem_chunk->GetRawValue(SymbolField, L"list_node_",
RawSearchNone, &sp_list_node));
sp_mem_chunk_ptr = nullptr;
sp_mem_chunk = nullptr;
RETURN_IF_FAIL(sp_list_node->GetRawValue(
SymbolField, L"next_", RawSearchNone, &sp_mem_chunk_ptr));
// Top of the loop will check if this is a nullptr and exit if so
}
sp_space_ptr = nullptr;
}
return S_OK;
}
IFACEMETHODIMP MemoryChunkIterator::Reset() noexcept {
position_ = 0;
return S_OK;
}
IFACEMETHODIMP MemoryChunkIterator::GetNext(IModelObject** object,
ULONG64 dimensions,
IModelObject** indexers,
IKeyStore** metadata) noexcept {
if (dimensions > 1) return E_INVALIDARG;
if (position_ == 0) {
RETURN_IF_FAIL(PopulateChunkData());
}
if (metadata != nullptr) *metadata = nullptr;
WRL::ComPtr<IModelObject> sp_index, sp_value;
if (dimensions == 1) {
RETURN_IF_FAIL(CreateULong64(position_, &sp_index));
}
RETURN_IF_FAIL(GetAt(position_, &sp_value));
// Now update counter and transfer ownership of results, because nothing can
// fail from this point onward.
++position_;
if (dimensions == 1) {
*indexers = sp_index.Detach();
}
*object = sp_value.Detach();
return S_OK;
}
HRESULT MemoryChunkIterator::GetAt(uint64_t index,
IModelObject** result) const {
if (index >= chunks_.size()) return E_BOUNDS;
// Create the synthetic object representing the chunk here
const ChunkData& curr_chunk = chunks_.at(index);
WRL::ComPtr<IModelObject> sp_value;
RETURN_IF_FAIL(
sp_data_model_manager->CreateSyntheticObject(sp_ctx_.Get(), &sp_value));
RETURN_IF_FAIL(
sp_value->SetKey(L"area_start", curr_chunk.area_start.Get(), nullptr));
RETURN_IF_FAIL(
sp_value->SetKey(L"area_end", curr_chunk.area_end.Get(), nullptr));
RETURN_IF_FAIL(sp_value->SetKey(L"space", curr_chunk.space.Get(), nullptr));
*result = sp_value.Detach();
return S_OK;
}
MemoryChunks::MemoryChunks() = default;
MemoryChunks::~MemoryChunks() = default;
IFACEMETHODIMP MemoryChunks::GetDimensionality(
IModelObject* context_object, ULONG64* dimensionality) noexcept {
*dimensionality = 1;
return S_OK;
}
IFACEMETHODIMP MemoryChunks::GetAt(IModelObject* context_object,
ULONG64 indexer_count,
IModelObject** indexers,
IModelObject** object,
IKeyStore** metadata) noexcept {
if (indexer_count != 1) return E_INVALIDARG;
if (metadata != nullptr) *metadata = nullptr;
WRL::ComPtr<IDebugHostContext> sp_ctx;
RETURN_IF_FAIL(context_object->GetContext(&sp_ctx));
// This should be instantiated once for each synthetic object returned,
// so should be able to cache/reuse an iterator
if (opt_chunks_ == nullptr) {
opt_chunks_ = WRL::Make<MemoryChunkIterator>(sp_ctx);
_ASSERT(opt_chunks_ != nullptr);
RETURN_IF_FAIL(opt_chunks_->PopulateChunkData());
}
uint64_t index;
RETURN_IF_FAIL(UnboxULong64(indexers[0], &index, true /*convert*/));
return opt_chunks_->GetAt(index, object);
}
IFACEMETHODIMP MemoryChunks::SetAt(IModelObject* context_object,
ULONG64 indexer_count,
IModelObject** indexers,
IModelObject* value) noexcept {
return E_NOTIMPL;
}
IFACEMETHODIMP MemoryChunks::GetDefaultIndexDimensionality(
IModelObject* context_object, ULONG64* dimensionality) noexcept {
*dimensionality = 1;
return S_OK;
}
IFACEMETHODIMP MemoryChunks::GetIterator(IModelObject* context_object,
IModelIterator** iterator) noexcept {
WRL::ComPtr<IDebugHostContext> sp_ctx;
RETURN_IF_FAIL(context_object->GetContext(&sp_ctx));
auto sp_memory_iterator{WRL::Make<MemoryChunkIterator>(sp_ctx)};
*iterator = sp_memory_iterator.Detach();
return S_OK;
}
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