[DWARF parser] Cleanup code in DWARFDebugLine.

Move several function definitions into .cpp, unify constructors
and clear() methods (fixing a couple of latent bugs from copy-paste),
turn static function parsePrologue() into Prologue::parse().

More work needed here to untangle weird multiple inheritance
in table parsing and dumping.

No functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207579 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 119 insertions, 98 deletions

diff --git a/lib/DebugInfo/DWARFContext.cpp b/lib/DebugInfo/DWARFContext.cpp
index 08b7b91637..6503207dae 100644
--- a/lib/DebugInfo/DWARFContext.cpp
+++ b/lib/DebugInfo/DWARFContext.cpp
@@ -142,7 +142,7 @@ void DWARFContext::dump(raw_ostream &OS, DIDumpType DumpType) {
     DataExtractor lineData(getLineDWOSection().Data, isLittleEndian(),
                            savedAddressByteSize);
     DWARFDebugLine::DumpingState state(OS);
-    while (DWARFDebugLine::parsePrologue(lineData, &stmtOffset, &state.Prologue))
+    while (state.Prologue.parse(lineData, &stmtOffset))
       state.finalize();
   }
 
diff --git a/lib/DebugInfo/DWARFDebugLine.cpp b/lib/DebugInfo/DWARFDebugLine.cpp
index de543eec2d..8ca7ec18d2 100644
--- a/lib/DebugInfo/DWARFDebugLine.cpp
+++ b/lib/DebugInfo/DWARFDebugLine.cpp
@@ -16,6 +16,19 @@
 using namespace llvm;
 using namespace dwarf;
 
+DWARFDebugLine::Prologue::Prologue() {
+  clear();
+}
+
+void DWARFDebugLine::Prologue::clear() {
+  TotalLength = Version = PrologueLength = 0;
+  MinInstLength = MaxOpsPerInst = DefaultIsStmt = LineBase = LineRange = 0;
+  OpcodeBase = 0;
+  StandardOpcodeLengths.clear();
+  IncludeDirectories.clear();
+  FileNames.clear();
+}
+
 void DWARFDebugLine::Prologue::dump(raw_ostream &OS) const {
   OS << "Line table prologue:\n"
      << format("    total_length: 0x%8.8x\n", TotalLength)
@@ -51,6 +64,67 @@ void DWARFDebugLine::Prologue::dump(raw_ostream &OS) const {
   }
 }
 
+bool DWARFDebugLine::Prologue::parse(DataExtractor debug_line_data,
+                                     uint32_t *offset_ptr) {
+  const uint32_t prologue_offset = *offset_ptr;
+
+  clear();
+  TotalLength = debug_line_data.getU32(offset_ptr);
+  Version = debug_line_data.getU16(offset_ptr);
+  if (Version < 2)
+    return false;
+
+  PrologueLength = debug_line_data.getU32(offset_ptr);
+  const uint32_t end_prologue_offset = PrologueLength + *offset_ptr;
+  MinInstLength = debug_line_data.getU8(offset_ptr);
+  if (Version >= 4)
+    MaxOpsPerInst = debug_line_data.getU8(offset_ptr);
+  DefaultIsStmt = debug_line_data.getU8(offset_ptr);
+  LineBase = debug_line_data.getU8(offset_ptr);
+  LineRange = debug_line_data.getU8(offset_ptr);
+  OpcodeBase = debug_line_data.getU8(offset_ptr);
+
+  StandardOpcodeLengths.reserve(OpcodeBase - 1);
+  for (uint32_t i = 1; i < OpcodeBase; ++i) {
+    uint8_t op_len = debug_line_data.getU8(offset_ptr);
+    StandardOpcodeLengths.push_back(op_len);
+  }
+
+  while (*offset_ptr < end_prologue_offset) {
+    const char *s = debug_line_data.getCStr(offset_ptr);
+    if (s && s[0])
+      IncludeDirectories.push_back(s);
+    else
+      break;
+  }
+
+  while (*offset_ptr < end_prologue_offset) {
+    const char *name = debug_line_data.getCStr(offset_ptr);
+    if (name && name[0]) {
+      FileNameEntry fileEntry;
+      fileEntry.Name = name;
+      fileEntry.DirIdx = debug_line_data.getULEB128(offset_ptr);
+      fileEntry.ModTime = debug_line_data.getULEB128(offset_ptr);
+      fileEntry.Length = debug_line_data.getULEB128(offset_ptr);
+      FileNames.push_back(fileEntry);
+    } else {
+      break;
+    }
+  }
+
+  if (*offset_ptr != end_prologue_offset) {
+    fprintf(stderr, "warning: parsing line table prologue at 0x%8.8x should"
+                    " have ended at 0x%8.8x but it ended at 0x%8.8x\n",
+            prologue_offset, end_prologue_offset, *offset_ptr);
+    return false;
+  }
+  return true;
+}
+
+DWARFDebugLine::Row::Row(bool default_is_stmt) {
+  reset(default_is_stmt);
+}
+
 void DWARFDebugLine::Row::postAppend() {
   BasicBlock = false;
   PrologueEnd = false;
@@ -82,6 +156,22 @@ void DWARFDebugLine::Row::dump(raw_ostream &OS) const {
      << '\n';
 }
 
+DWARFDebugLine::Sequence::Sequence() {
+  reset();
+}
+
+void DWARFDebugLine::Sequence::reset() {
+  LowPC = 0;
+  HighPC = 0;
+  FirstRowIndex = 0;
+  LastRowIndex = 0;
+  Empty = true;
+}
+
+DWARFDebugLine::LineTable::LineTable() {
+  clear();
+}
+
 void DWARFDebugLine::LineTable::dump(raw_ostream &OS) const {
   Prologue.dump(OS);
   OS << '\n';
@@ -96,6 +186,12 @@ void DWARFDebugLine::LineTable::dump(raw_ostream &OS) const {
   }
 }
 
+void DWARFDebugLine::LineTable::clear() {
+  Prologue.clear();
+  Rows.clear();
+  Sequences.clear();
+}
+
 DWARFDebugLine::State::~State() {}
 
 void DWARFDebugLine::State::appendRowToMatrix(uint32_t offset) {
@@ -165,64 +261,6 @@ DWARFDebugLine::getOrParseLineTable(DataExtractor debug_line_data,
   return &pos.first->second;
 }
 
-bool
-DWARFDebugLine::parsePrologue(DataExtractor debug_line_data,
-                              uint32_t *offset_ptr, Prologue *prologue) {
-  const uint32_t prologue_offset = *offset_ptr;
-
-  prologue->clear();
-  prologue->TotalLength = debug_line_data.getU32(offset_ptr);
-  prologue->Version = debug_line_data.getU16(offset_ptr);
-  if (prologue->Version < 2)
-    return false;
-
-  prologue->PrologueLength = debug_line_data.getU32(offset_ptr);
-  const uint32_t end_prologue_offset = prologue->PrologueLength + *offset_ptr;
-  prologue->MinInstLength = debug_line_data.getU8(offset_ptr);
-  if (prologue->Version >= 4)
-    prologue->MaxOpsPerInst = debug_line_data.getU8(offset_ptr);
-  prologue->DefaultIsStmt = debug_line_data.getU8(offset_ptr);
-  prologue->LineBase = debug_line_data.getU8(offset_ptr);
-  prologue->LineRange = debug_line_data.getU8(offset_ptr);
-  prologue->OpcodeBase = debug_line_data.getU8(offset_ptr);
-
-  prologue->StandardOpcodeLengths.reserve(prologue->OpcodeBase-1);
-  for (uint32_t i = 1; i < prologue->OpcodeBase; ++i) {
-    uint8_t op_len = debug_line_data.getU8(offset_ptr);
-    prologue->StandardOpcodeLengths.push_back(op_len);
-  }
-
-  while (*offset_ptr < end_prologue_offset) {
-    const char *s = debug_line_data.getCStr(offset_ptr);
-    if (s && s[0])
-      prologue->IncludeDirectories.push_back(s);
-    else
-      break;
-  }
-
-  while (*offset_ptr < end_prologue_offset) {
-    const char *name = debug_line_data.getCStr(offset_ptr);
-    if (name && name[0]) {
-      FileNameEntry fileEntry;
-      fileEntry.Name = name;
-      fileEntry.DirIdx = debug_line_data.getULEB128(offset_ptr);
-      fileEntry.ModTime = debug_line_data.getULEB128(offset_ptr);
-      fileEntry.Length = debug_line_data.getULEB128(offset_ptr);
-      prologue->FileNames.push_back(fileEntry);
-    } else {
-      break;
-    }
-  }
-
-  if (*offset_ptr != end_prologue_offset) {
-    fprintf(stderr, "warning: parsing line table prologue at 0x%8.8x should"
-                    " have ended at 0x%8.8x but it ended at 0x%8.8x\n",
-            prologue_offset, end_prologue_offset, *offset_ptr);
-    return false;
-  }
-  return true;
-}
-
 bool DWARFDebugLine::parseStatementTable(DataExtractor debug_line_data,
                                          const RelocAddrMap *RMap,
                                          uint32_t *offset_ptr, State &state) {
@@ -230,7 +268,7 @@ bool DWARFDebugLine::parseStatementTable(DataExtractor debug_line_data,
 
   Prologue *prologue = &state.Prologue;
 
-  if (!parsePrologue(debug_line_data, offset_ptr, prologue)) {
+  if (!prologue->parse(debug_line_data, offset_ptr)) {
     // Restore our offset and return false to indicate failure!
     *offset_ptr = debug_line_offset;
     return false;
@@ -486,8 +524,7 @@ bool DWARFDebugLine::parseStatementTable(DataExtractor debug_line_data,
   return end_offset;
 }
 
-uint32_t
-DWARFDebugLine::LineTable::lookupAddress(uint64_t address) const {
+uint32_t DWARFDebugLine::LineTable::lookupAddress(uint64_t address) const {
   uint32_t unknown_index = UINT32_MAX;
   if (Sequences.empty())
     return unknown_index;
@@ -532,10 +569,8 @@ DWARFDebugLine::LineTable::lookupAddress(uint64_t address) const {
   return index;
 }
 
-bool
-DWARFDebugLine::LineTable::lookupAddressRange(uint64_t address,
-                                       uint64_t size, 
-                                       std::vector<uint32_t>& result) const {
+bool DWARFDebugLine::LineTable::lookupAddressRange(
+    uint64_t address, uint64_t size, std::vector<uint32_t> &result) const {
   if (Sequences.empty())
     return false;
   uint64_t end_addr = address + size;
diff --git a/lib/DebugInfo/DWARFDebugLine.h b/lib/DebugInfo/DWARFDebugLine.h
index 890eb28c1e..ec73970f0f 100644
--- a/lib/DebugInfo/DWARFDebugLine.h
+++ b/lib/DebugInfo/DWARFDebugLine.h
@@ -33,10 +33,7 @@ public:
   };
 
   struct Prologue {
-    Prologue()
-        : TotalLength(0), Version(0), PrologueLength(0), MinInstLength(0),
-          MaxOpsPerInst(0), DefaultIsStmt(0), LineBase(0), LineRange(0),
-          OpcodeBase(0) {}
+    Prologue();
 
     // The size in bytes of the statement information for this compilation unit
     // (not including the total_length field itself).
@@ -77,19 +74,16 @@ public:
     int32_t getMaxLineIncrementForSpecialOpcode() const {
       return LineBase + (int8_t)LineRange - 1;
     }
+
+    void clear();
     void dump(raw_ostream &OS) const;
-    void clear() {
-      TotalLength = Version = PrologueLength = 0;
-      MinInstLength = LineBase = LineRange = OpcodeBase = 0;
-      StandardOpcodeLengths.clear();
-      IncludeDirectories.clear();
-      FileNames.clear();
-    }
+    bool parse(DataExtractor debug_line_data, uint32_t *offset_ptr);
   };
 
   // Standard .debug_line state machine structure.
   struct Row {
-    Row(bool default_is_stmt = false) { reset(default_is_stmt); }
+    explicit Row(bool default_is_stmt = false);
+
     /// Called after a row is appended to the matrix.
     void postAppend();
     void reset(bool default_is_stmt);
@@ -151,14 +145,9 @@ public:
     unsigned LastRowIndex;
     bool Empty;
 
-    Sequence() { reset(); }
-    void reset() {
-      LowPC = 0;
-      HighPC = 0;
-      FirstRowIndex = 0;
-      LastRowIndex = 0;
-      Empty = true;
-    }
+    Sequence();
+    void reset();
+
     static bool orderByLowPC(const Sequence& LHS, const Sequence& RHS) {
       return LHS.LowPC < RHS.LowPC;
     }
@@ -171,23 +160,21 @@ public:
   };
 
   struct LineTable {
-    void appendRow(const DWARFDebugLine::Row &state) { Rows.push_back(state); }
-    void appendSequence(const DWARFDebugLine::Sequence &sequence) {
-      Sequences.push_back(sequence);
+    LineTable();
+
+    void appendRow(const DWARFDebugLine::Row &R) {
+      Rows.push_back(R);
     }
-    void clear() {
-      Prologue.clear();
-      Rows.clear();
-      Sequences.clear();
+    void appendSequence(const DWARFDebugLine::Sequence &S) {
+      Sequences.push_back(S);
     }
 
     // Returns the index of the row with file/line info for a given address,
     // or -1 if there is no such row.
     uint32_t lookupAddress(uint64_t address) const;
 
-    bool lookupAddressRange(uint64_t address,
-                            uint64_t size, 
-                            std::vector<uint32_t>& result) const;
+    bool lookupAddressRange(uint64_t address, uint64_t size,
+                            std::vector<uint32_t> &result) const;
 
     // Extracts filename by its index in filename table in prologue.
     // Returns true on success.
@@ -196,6 +183,7 @@ public:
                             std::string &Result) const;
 
     void dump(raw_ostream &OS) const;
+    void clear();
 
     struct Prologue Prologue;
     typedef std::vector<Row> RowVector;
@@ -236,8 +224,6 @@ public:
     raw_ostream &OS;
   };
 
-  static bool parsePrologue(DataExtractor debug_line_data, uint32_t *offset_ptr,
-                            Prologue *prologue);
   /// Parse a single line table (prologue and all rows).
   static bool parseStatementTable(DataExtractor debug_line_data,
                                   const RelocAddrMap *RMap,