[Lldb-commits] [lldb] [llvm] [LLDB][Minidump] Add 64b support to LLDB's minidump file builder. (PR #95312)

Greg Clayton via lldb-commits lldb-commits at lists.llvm.org
Thu Jun 13 14:15:15 PDT 2024


================
@@ -858,10 +923,224 @@ Status MinidumpFileBuilder::Dump(lldb::FileUP &core_file) const {
   return error;
 }
 
-size_t MinidumpFileBuilder::GetDirectoriesNum() const {
-  return m_directories.size();
+Status MinidumpFileBuilder::AddMemoryList_32(
+    const Process::CoreFileMemoryRanges &ranges) {
+  std::vector<MemoryDescriptor> descriptors;
+  Status error;
+  Log *log = GetLog(LLDBLog::Object);
+  size_t region_index = 0;
+  for (const auto &core_range : ranges) {
+    // Take the offset before we write.
+    const size_t offset_for_data = GetCurrentDataEndOffset();
+    const addr_t addr = core_range.range.start();
+    const addr_t size = core_range.range.size();
+    auto data_up = std::make_unique<DataBufferHeap>(size, 0);
+
+    LLDB_LOGF(log,
+              "/AddMemoryList/AddMemory/ %zu/%zu reading memory for region "
+              "(%zu bytes) [%zx, %zx)",
+              region_index, ranges.size(), size, addr, addr + size);
+    ++region_index;
+
+    const size_t bytes_read =
+        m_process_sp->ReadMemory(addr, data_up->GetBytes(), size, error);
+    if (error.Fail() || bytes_read == 0) {
+      LLDB_LOGF(log, "Failed to read memory region. Bytes read: %zu, error: %s",
+                bytes_read, error.AsCString());
+      // Just skip sections with errors or zero bytes in 32b mode
+      continue;
+    } else if (bytes_read != size) {
+      LLDB_LOGF(log, "Memory region at: %zu failed to read %zu bytes", addr,
+                size);
+    }
+
+    MemoryDescriptor descriptor;
+    descriptor.StartOfMemoryRange =
+        static_cast<llvm::support::ulittle64_t>(addr);
+    descriptor.Memory.DataSize =
+        static_cast<llvm::support::ulittle32_t>(bytes_read);
+    descriptor.Memory.RVA =
+        static_cast<llvm::support::ulittle32_t>(offset_for_data);
+    descriptors.push_back(descriptor);
+    if (m_thread_by_range_start.count(addr) > 0) {
+      m_thread_by_range_start[addr].Stack = descriptor;
+    }
+
+    // Add the data to the buffer, flush as needed.
+    error = AddData(data_up->GetBytes(), bytes_read);
+    if (error.Fail())
+      return error;
+  }
+
+  // Add a directory that references this list
+  // With a size of the number of ranges as a 32 bit num
+  // And then the size of all the ranges
+  AddDirectory(StreamType::MemoryList,
+               sizeof(llvm::support::ulittle32_t) +
+                   descriptors.size() *
+                       sizeof(llvm::minidump::MemoryDescriptor));
+
+  llvm::support::ulittle32_t memory_ranges_num =
+      static_cast<llvm::support::ulittle32_t>(descriptors.size());
+  m_data.AppendData(&memory_ranges_num, sizeof(llvm::support::ulittle32_t));
+  // For 32b we can get away with writing off the descriptors after the data.
+  // This means no cleanup loop needed.
+  m_data.AppendData(descriptors.data(),
+                    descriptors.size() * sizeof(MemoryDescriptor));
+
+  return error;
 }
 
-size_t MinidumpFileBuilder::GetCurrentDataEndOffset() const {
-  return sizeof(llvm::minidump::Header) + m_data.GetByteSize();
+Status MinidumpFileBuilder::AddMemoryList_64(
+    const Process::CoreFileMemoryRanges &ranges) {
+  AddDirectory(StreamType::Memory64List,
+               (sizeof(llvm::support::ulittle64_t) * 2) +
+                   ranges.size() * sizeof(llvm::minidump::MemoryDescriptor_64));
+
+  llvm::support::ulittle64_t memory_ranges_num =
+      static_cast<llvm::support::ulittle64_t>(ranges.size());
+  m_data.AppendData(&memory_ranges_num, sizeof(llvm::support::ulittle64_t));
+  llvm::support::ulittle64_t memory_ranges_base_rva =
+      static_cast<llvm::support::ulittle64_t>(GetCurrentDataEndOffset());
+  m_data.AppendData(&memory_ranges_base_rva,
+                    sizeof(llvm::support::ulittle64_t));
+  // Capture the starting offset, so we can do cleanup later if needed.
+  uint64_t starting_offset = GetCurrentDataEndOffset();
+
+  bool cleanup_required = false;
+  std::vector<MemoryDescriptor_64> descriptors;
+  // Enumerate the ranges and create the memory descriptors so we can append
+  // them first
+  for (const auto core_range : ranges) {
+    // Add the space required to store the memory descriptor
+    MemoryDescriptor_64 memory_desc;
+    memory_desc.StartOfMemoryRange =
+        static_cast<llvm::support::ulittle64_t>(core_range.range.start());
+    memory_desc.DataSize =
+        static_cast<llvm::support::ulittle64_t>(core_range.range.size());
+    descriptors.push_back(memory_desc);
+    // Now write this memory descriptor to the buffer.
+    m_data.AppendData(&memory_desc, sizeof(MemoryDescriptor_64));
+  }
+
+  Status error;
+  Log *log = GetLog(LLDBLog::Object);
+  size_t region_index = 0;
+  for (const auto &core_range : ranges) {
+    const addr_t addr = core_range.range.start();
+    const addr_t size = core_range.range.size();
+    auto data_up = std::make_unique<DataBufferHeap>(size, 0);
----------------
clayborg wrote:

move this out of the for loop and have it contain `max_size` bytes just like in the 32 bit variant of this function.

https://github.com/llvm/llvm-project/pull/95312


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