From eceb5b99777ba944a0ae3748a0371e9a3aa94d56 Mon Sep 17 00:00:00 2001
From: Alexey Samsonov <samsonov@google.com>
Date: Mon, 27 Aug 2012 07:17:47 +0000
Subject: Add basic support for .debug_ranges section to LLVM's DebugInfo
 library. This section (introduced in DWARF-3) is used to define instruction
 address ranges for functions that are not contiguous and can't be described
 by low_pc/high_pc attributes (this is the usual case for inlined
 subroutines). The patch is the first step to support fetching complete
 inlining info from DWARF.

Reviewed by Benjamin Kramer.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162657 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/DebugInfo/DWARFDebugRangeList.h | 51 +++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 lib/DebugInfo/DWARFDebugRangeList.h

(limited to 'lib/DebugInfo/DWARFDebugRangeList.h')

diff --git a/lib/DebugInfo/DWARFDebugRangeList.h b/lib/DebugInfo/DWARFDebugRangeList.h
new file mode 100644
index 0000000..b8d334f
--- /dev/null
+++ b/lib/DebugInfo/DWARFDebugRangeList.h
@@ -0,0 +1,51 @@
+//===-- DWARFDebugRangeList.h -----------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DEBUGINFO_DWARFDEBUGRANGELIST_H
+#define LLVM_DEBUGINFO_DWARFDEBUGRANGELIST_H
+
+#include "llvm/Support/DataExtractor.h"
+#include <vector>
+
+namespace llvm {
+
+class raw_ostream;
+
+class DWARFDebugRangeList {
+public:
+  struct RangeListEntry {
+    // A beginning address offset. This address offset has the size of an
+    // address and is relative to the applicable base address of the
+    // compilation unit referencing this range list. It marks the beginning
+    // of an address range.
+    uint64_t StartAddress;
+    // An ending address offset. This address offset again has the size of
+    // an address and is relative to the applicable base address of the
+    // compilation unit referencing this range list. It marks the first
+    // address past the end of the address range. The ending address must
+    // be greater than or equal to the beginning address.
+    uint64_t EndAddress;
+  };
+
+private:
+  // Offset in .debug_ranges section.
+  uint32_t Offset;
+  uint8_t AddressSize;
+  std::vector<RangeListEntry> Entries;
+
+public:
+  DWARFDebugRangeList() { clear(); }
+  void clear();
+  void dump(raw_ostream &OS) const;
+  bool extract(DataExtractor data, uint32_t *offset_ptr);
+};
+
+}  // namespace llvm
+
+#endif  // LLVM_DEBUGINFO_DWARFDEBUGRANGELIST_H
-- 
cgit v1.1


From 5eae90d727c64ca5b4b43b110521b38dcd9f0de6 Mon Sep 17 00:00:00 2001
From: Alexey Samsonov <samsonov@google.com>
Date: Tue, 4 Sep 2012 08:12:33 +0000
Subject: Add support for fetching inlining context (stack of source code
 locations) by instruction address from DWARF.

Add --inlining flag to llvm-dwarfdump to demonstrate and test this functionality,
so that "llvm-dwarfdump --inlining --address=0x..." now works much like
"addr2line -i 0x...", provided that the binary has debug info
(Clang's -gline-tables-only *is* enough).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163128 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/DebugInfo/DWARFDebugRangeList.h | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

(limited to 'lib/DebugInfo/DWARFDebugRangeList.h')

diff --git a/lib/DebugInfo/DWARFDebugRangeList.h b/lib/DebugInfo/DWARFDebugRangeList.h
index b8d334f..4e34a91 100644
--- a/lib/DebugInfo/DWARFDebugRangeList.h
+++ b/lib/DebugInfo/DWARFDebugRangeList.h
@@ -31,6 +31,29 @@ public:
     // address past the end of the address range. The ending address must
     // be greater than or equal to the beginning address.
     uint64_t EndAddress;
+    // The end of any given range list is marked by an end of list entry,
+    // which consists of a 0 for the beginning address offset
+    // and a 0 for the ending address offset.
+    bool isEndOfListEntry() const {
+      return (StartAddress == 0) && (EndAddress == 0);
+    }
+    // A base address selection entry consists of:
+    // 1. The value of the largest representable address offset
+    // (for example, 0xffffffff when the size of an address is 32 bits).
+    // 2. An address, which defines the appropriate base address for
+    // use in interpreting the beginning and ending address offsets of
+    // subsequent entries of the location list.
+    bool isBaseAddressSelectionEntry(uint8_t AddressSize) const {
+      assert(AddressSize == 4 || AddressSize == 8);
+      if (AddressSize == 4)
+        return StartAddress == -1U;
+      else
+        return StartAddress == -1ULL;
+    }
+    bool containsAddress(uint64_t BaseAddress, uint64_t Address) const {
+      return (BaseAddress + StartAddress <= Address) &&
+             (Address < BaseAddress + EndAddress);
+    }
   };
 
 private:
@@ -44,6 +67,10 @@ public:
   void clear();
   void dump(raw_ostream &OS) const;
   bool extract(DataExtractor data, uint32_t *offset_ptr);
+  /// containsAddress - Returns true if range list contains the given
+  /// address. Has to be passed base address of the compile unit that
+  /// references this range list.
+  bool containsAddress(uint64_t BaseAddress, uint64_t Address) const;
 };
 
 }  // namespace llvm
-- 
cgit v1.1