1 files changed, 128 insertions, 0 deletions
diff --git a/contrib/llvm/tools/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugMacro.cpp b/contrib/llvm/tools/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugMacro.cpp
new file mode 100644
index 000000000000..75c812e6e79d
--- /dev/null
+++ b/contrib/llvm/tools/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugMacro.cpp
@@ -0,0 +1,128 @@
+//===-- DWARFDebugMacro.cpp -------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DWARFDebugMacro.h"
+#include "SymbolFileDWARF.h"
+
+#include "lldb/Symbol/DebugMacros.h"
+
+#include "DWARFDataExtractor.h"
+
+using namespace lldb_private;
+
+DWARFDebugMacroHeader
+DWARFDebugMacroHeader::ParseHeader(const DWARFDataExtractor &debug_macro_data, lldb::offset_t *offset)
+{
+    DWARFDebugMacroHeader header;
+
+    // Skip over the version field in header.
+    header.m_version = debug_macro_data.GetU16(offset);
+
+    uint8_t flags = debug_macro_data.GetU8(offset);
+    header.m_offset_is_64_bit = flags & OFFSET_SIZE_MASK ? true : false;
+
+    if (flags & DEBUG_LINE_OFFSET_MASK)
+    {
+        if (header.m_offset_is_64_bit)
+            header.m_debug_line_offset = debug_macro_data.GetU64(offset);
+        else
+            header.m_debug_line_offset = debug_macro_data.GetU32(offset);
+    }
+
+    // Skip over the operands table if it is present.
+    if (flags & OPCODE_OPERANDS_TABLE_MASK)
+        SkipOperandTable(debug_macro_data, offset);
+
+    return header;
+}
+
+void
+DWARFDebugMacroHeader::SkipOperandTable(const DWARFDataExtractor &debug_macro_data, lldb::offset_t *offset)
+{
+    uint8_t entry_count = debug_macro_data.GetU8(offset);
+    for (uint8_t i = 0; i < entry_count; i++)
+    {
+        // Skip over the opcode number.
+        debug_macro_data.GetU8(offset);
+
+        uint64_t operand_count = debug_macro_data.GetULEB128(offset);
+
+        for (uint64_t j = 0; j < operand_count; j++)
+        {
+            // Skip over the operand form
+            debug_macro_data.GetU8(offset);
+        }
+    }
+}
+
+void
+DWARFDebugMacroEntry::ReadMacroEntries(const DWARFDataExtractor &debug_macro_data,
+                                       const DWARFDataExtractor &debug_str_data,
+                                       const bool offset_is_64_bit,
+                                       lldb::offset_t *offset,
+                                       SymbolFileDWARF *sym_file_dwarf,
+                                       DebugMacrosSP &debug_macros_sp)
+{
+    llvm::dwarf::MacroEntryType type = static_cast<llvm::dwarf::MacroEntryType>(debug_macro_data.GetU8(offset));
+    while (type != 0)
+    {
+        lldb::offset_t new_offset = 0, str_offset = 0;
+        uint32_t line = 0;
+        const char *macro_str = nullptr;
+        uint32_t debug_line_file_idx = 0;
+
+        switch (type)
+        {
+            case DW_MACRO_define:
+            case DW_MACRO_undef:
+                line = debug_macro_data.GetULEB128(offset);
+                macro_str = debug_macro_data.GetCStr(offset);
+                if (type == DW_MACRO_define)
+                    debug_macros_sp->AddMacroEntry(DebugMacroEntry::CreateDefineEntry(line, macro_str));
+                else
+                    debug_macros_sp->AddMacroEntry(DebugMacroEntry::CreateUndefEntry(line, macro_str));
+                break;
+            case DW_MACRO_define_indirect:
+            case DW_MACRO_undef_indirect:
+                line = debug_macro_data.GetULEB128(offset);
+                if (offset_is_64_bit)
+                    str_offset = debug_macro_data.GetU64(offset);
+                else
+                    str_offset = debug_macro_data.GetU32(offset);
+                macro_str = debug_str_data.GetCStr(&str_offset);
+                if (type == DW_MACRO_define_indirect)
+                    debug_macros_sp->AddMacroEntry(DebugMacroEntry::CreateDefineEntry(line, macro_str));
+                else
+                    debug_macros_sp->AddMacroEntry(DebugMacroEntry::CreateUndefEntry(line, macro_str));
+                break;
+            case DW_MACRO_start_file:
+                line = debug_macro_data.GetULEB128(offset);
+                debug_line_file_idx = debug_macro_data.GetULEB128(offset);
+                debug_macros_sp->AddMacroEntry(DebugMacroEntry::CreateStartFileEntry(line, debug_line_file_idx));
+                break;
+            case DW_MACRO_end_file:
+                // This operation has no operands.
+                debug_macros_sp->AddMacroEntry(DebugMacroEntry::CreateEndFileEntry());
+                break;
+            case DW_MACRO_transparent_include:
+                if (offset_is_64_bit)
+                    new_offset = debug_macro_data.GetU64(offset);
+                else
+                    new_offset = debug_macro_data.GetU32(offset);
+                debug_macros_sp->AddMacroEntry(
+                    DebugMacroEntry::CreateIndirectEntry(sym_file_dwarf->ParseDebugMacros(&new_offset)));
+                break;
+            default:
+                // TODO: Add support for other standard operations.
+                // TODO: Provide mechanism to hook handling of non-standard/extension operands.
+                return;
+        }
+        type = static_cast<llvm::dwarf::MacroEntryType>(debug_macro_data.GetU8(offset));
+    }
+}