[llvm-debuginfo-analyzer] Add support for LLVM IR format.

llvm/docs/CommandGuide/llvm-debuginfo-analyzer.rst

@@ -13,10 +13,11 @@ SYNOPSIS
 DESCRIPTION
 -----------
 :program:`llvm-debuginfo-analyzer` parses debug and text sections in
-binary object files and prints their contents in a logical view, which
-is a human-readable representation that closely matches the structure
-of the original user source code. Supported object file formats include
-ELF, Mach-O, WebAssembly, PDB and COFF.
+binary object files and textual IR representations and prints their
+contents in a logical view, which is a human readable representation
+that closely matches the structure of the original user source code.
+Supported object file formats include ELF, Mach-O, WebAssembly, PDB,
+COFF, IR (textual representation and bitcode).
 
 The **logical view** abstracts the complexity associated with the
 different low-level representations of the debugging information that
@@ -2131,6 +2132,166 @@ layout and given the number of matches.
   -----------------------------
   Total           71          8
 
+IR (Textual representation and bitcode) SUPPORT
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+The below example is used to show the IR output generated by
+:program:`llvm-debuginfo-analyzer`. We compiled the example for a
+IR 64-bit target with Clang (-O0 -g --target=x86_64-linux):
+
+.. code-block:: c++
+
+  1  using INTPTR = const int *;
+  2  int foo(INTPTR ParamPtr, unsigned ParamUnsigned, bool ParamBool) {
+  3    if (ParamBool) {
+  4      typedef int INTEGER;
+  5      const INTEGER CONSTANT = 7;
+  6      return CONSTANT;
+  7    }
+  8    return ParamUnsigned;
+  9  }
+
+PRINT BASIC DETAILS
+^^^^^^^^^^^^^^^^^^^
+The following command prints basic details for all the logical elements
+sorted by the debug information internal offset; it includes its lexical
+level and debug info format.
+
+.. code-block:: none
+
+  llvm-debuginfo-analyzer --attribute=level,format
+                          --output-sort=offset
+                          --print=scopes,symbols,types,lines,instructions
+                          test-clang.ll
+
+or
+
+.. code-block:: none
+
+  llvm-debuginfo-analyzer --attribute=level,format
+                          --output-sort=offset
+                          --print=elements
+                          test-clang.ll
+
+Each row represents an element that is present within the debug
+information. The first column represents the scope level, followed by
+the associated line number (if any), and finally the description of
+the element.
+
+.. code-block:: none
+
+  Logical View:
+  [000]           {File} 'test-clang.ll' -> Textual IR
+
+  [001]             {CompileUnit} 'test.cpp'
+  [002]     2         {Function} extern not_inlined 'foo' -> 'int'
+  [003]                 {Block}
+  [004]     5             {Variable} 'CONSTANT' -> 'const INTEGER'
+  [004]     5             {Line}
+  [004]                   {Code} 'store i32 7, ptr %CONSTANT, align 4, !dbg !32'
+  [004]     6             {Line}
+  [004]                   {Code} 'store i32 7, ptr %retval, align 4, !dbg !33'
+  [004]     6             {Line}
+  [004]                   {Code} 'br label %return, !dbg !33'
+  [003]     2           {Parameter} 'ParamPtr' -> 'INTPTR'
+  [003]     2           {Parameter} 'ParamUnsigned' -> 'unsigned int'
+  [003]     2           {Parameter} 'ParamBool' -> 'bool'
+  [003]     4           {TypeAlias} 'INTEGER' -> 'int'
+  [003]     2           {Line}
+  [003]                 {Code} '%retval = alloca i32, align 4'
+  [003]                 {Code} '%ParamPtr.addr = alloca ptr, align 8'
+  [003]                 {Code} '%ParamUnsigned.addr = alloca i32, align 4'
+  [003]                 {Code} '%ParamBool.addr = alloca i8, align 1'
+  [003]                 {Code} '%CONSTANT = alloca i32, align 4'
+  [003]                 {Code} 'store ptr %ParamPtr, ptr %ParamPtr.addr, align 8'
+  [003]                 {Code} 'store i32 %ParamUnsigned, ptr %ParamUnsigned.addr, align 4'
+  [003]                 {Code} '%storedv = zext i1 %ParamBool to i8'
+  [003]                 {Code} 'store i8 %storedv, ptr %ParamBool.addr, align 1'
+  [003]     8           {Line}
+  [003]                 {Code} '%1 = load i32, ptr %ParamUnsigned.addr, align 4, !dbg !34'
+  [003]     8           {Line}
+  [003]                 {Code} 'store i32 %1, ptr %retval, align 4, !dbg !35'
+  [003]     8           {Line}
+  [003]                 {Code} 'br label %return, !dbg !35'
+  [003]     9           {Line}
+  [003]                 {Code} '%2 = load i32, ptr %retval, align 4, !dbg !36'
+  [003]     9           {Line}
+  [003]                 {Code} 'ret i32 %2, !dbg !36'
+  [003]     3           {Line}
+  [003]     3           {Line}
+  [003]     3           {Line}
+  [003]                 {Code} 'br i1 %loadedv, label %if.then, label %if.end, !dbg !26'
+  [002]     1         {TypeAlias} 'INTPTR' -> '* const int'
+
+SELECT LOGICAL ELEMENTS
+^^^^^^^^^^^^^^^^^^^^^^^
+The following prints all *instructions*, *symbols* and *types* that
+contain **'block'** or **'.store'** in their names or types, using a tab
+layout and given the number of matches.
+
+.. code-block:: none
+
+  llvm-debuginfo-analyzer --attribute=level
+                          --select-nocase --select-regex
+                          --select=LOAD --select=store
+                          --report=list
+                          --print=symbols,types,instructions,summary
+                          test-clang.ll
+
+  Logical View:
+  [000]           {File} 'test-clang.ll'
+
+  [001]           {CompileUnit} 'test.cpp'
+  [003]           {Code} '%0 = load i8, ptr %ParamBool.addr, align 1, !dbg !26'
+  [003]           {Code} '%1 = load i32, ptr %ParamUnsigned.addr, align 4, !dbg !34'
+  [003]           {Code} '%2 = load i32, ptr %retval, align 4, !dbg !36'
+  [004]           {Code} '%loadedv = trunc i8 %0 to i1, !dbg !26'
+  [003]           {Code} '%storedv = zext i1 %ParamBool to i8'
+  [003]           {Code} 'br i1 %loadedv, label %if.then, label %if.end, !dbg !26'
+  [003]           {Code} 'store i32 %1, ptr %retval, align 4, !dbg !35'
+  [003]           {Code} 'store i32 %ParamUnsigned, ptr %ParamUnsigned.addr, align 4'
+  [004]           {Code} 'store i32 7, ptr %CONSTANT, align 4, !dbg !32'
+  [004]           {Code} 'store i32 7, ptr %retval, align 4, !dbg !33'
+  [003]           {Code} 'store i8 %storedv, ptr %ParamBool.addr, align 1'
+  [003]           {Code} 'store ptr %ParamPtr, ptr %ParamPtr.addr, align 8'
+
+  -----------------------------
+  Element      Total    Printed
+  -----------------------------
+  Scopes           5          0
+  Symbols          4          0
+  Types            2          0
+  Lines           22         12
+  -----------------------------
+  Total           33         12
+
+The following prints all *symbols* and *types* that contain the exact **'INTPTR'**
+in their names or types, using a tab layout and given the number of matches.
+
+.. code-block:: none
+
+  llvm-debuginfo-analyzer --attribute=level
+                          --select=INTPTR
+                          --report=list
+                          --print=symbols,types,summary
+                          test-clang.ll
+
+  Logical View:
+  [000]           {File} 'test-clang.ll'
+
+  [001]           {CompileUnit} 'test.cpp'
+  [002]     1     {TypeAlias} 'INTPTR' -> '* const int'
+  [003]     2     {Parameter} 'ParamPtr' -> 'INTPTR'
+
+  -----------------------------
+  Element      Total    Printed
+  -----------------------------
+  Scopes           5          0
+  Symbols          4          1
+  Types            2          1
+  Lines           23          0
+  -----------------------------
+  Total           34          2
+
 COMPARISON MODE
 ^^^^^^^^^^^^^^^
 Given the previous example we found the above debug information issue
@@ -2204,6 +2365,34 @@ giving more context by swapping the reference and target object files.
 The output shows the merging view path (reference and target) with the
 missing and added elements.
 
+.. code-block:: none
+
+  llvm-debuginfo-analyzer --attribute=level,format
+                          --compare=types
+                          --report=view
+                          --print=symbols,types
+                          test-clang.bc test-dwarf-gcc.o
+
+  Reference: 'test-clang.bc'
+  Target:    'test-dwarf-gcc.o'
+
+  Logical View:
+   [000]           {File} 'test-clang.bc' -> Bitcode IR
+
+   [001]             {CompileUnit} 'test.cpp'
+   [002]     1         {TypeAlias} 'INTPTR' -> '* const int'
+   [002]     2         {Function} extern not_inlined 'foo' -> 'int'
+   [003]                 {Block}
+   [004]     5             {Variable} 'CONSTANT' -> 'const INTEGER'
+  +[004]     4             {TypeAlias} 'INTEGER' -> 'int'
+   [003]     2           {Parameter} 'ParamBool' -> 'bool'
+   [003]     2           {Parameter} 'ParamPtr' -> 'INTPTR'
+   [003]     2           {Parameter} 'ParamUnsigned' -> 'unsigned int'
+  -[003]     4           {TypeAlias} 'INTEGER' -> 'int'
+
+The same output but this time comparing the Clang bitcode with the
+binary object (DWARF) generated by GCC.
+
 LOGICAL ELEMENTS
 """"""""""""""""
 It compares individual logical elements without considering if their

llvm/include/llvm/DebugInfo/LogicalView/Core/LVSupport.h

@@ -119,6 +119,19 @@ template <typename T> class LVProperties {
 #define KIND_3(ENUM, FIELD, F1, F2, F3)                                        \
   BOOL_BIT_3(Kinds, ENUM, FIELD, F1, F2, F3)
 
+const int DEC_WIDTH = 8;
+inline FormattedNumber decValue(uint64_t N, unsigned Width = DEC_WIDTH) {
+  return format_decimal(N, Width);
+}
+
+// Output the decimal representation of 'Value'.
+inline std::string decString(uint64_t Value, size_t Width = DEC_WIDTH) {
+  std::string String;
+  raw_string_ostream Stream(String);
+  Stream << decValue(Value, Width);
+  return Stream.str();
+}
+
 const int HEX_WIDTH = 12;
 inline FormattedNumber hexValue(uint64_t N, unsigned Width = HEX_WIDTH,
                                 bool Upper = false) {

llvm/include/llvm/DebugInfo/LogicalView/LVReaderHandler.h

@@ -17,6 +17,7 @@
 #include "llvm/DebugInfo/LogicalView/Core/LVReader.h"
 #include "llvm/DebugInfo/PDB/Native/PDBFile.h"
 #include "llvm/Object/Archive.h"
+#include "llvm/Object/IRObjectFile.h"
 #include "llvm/Object/MachOUniversal.h"
 #include "llvm/Object/ObjectFile.h"
 #include "llvm/Support/Compiler.h"
@@ -30,7 +31,9 @@ namespace logicalview {
 
 using LVReaders = std::vector<std::unique_ptr<LVReader>>;
 using ArgVector = std::vector<std::string>;
-using PdbOrObj = PointerUnion<object::ObjectFile *, pdb::PDBFile *>;
+using InputHandle =
+    PointerUnion<object::ObjectFile *, pdb::PDBFile *, object::IRObjectFile *,
+                 MemoryBufferRef *, StringRef *>;
 
 // This class performs the following tasks:
 // - Creates a logical reader for every binary file in the command line,
@@ -61,8 +64,10 @@ class LVReaderHandler {
                      object::Binary &Binary);
   Error handleObject(LVReaders &Readers, StringRef Filename, StringRef Buffer,
                      StringRef ExePath);
+  Error handleObject(LVReaders &Readers, StringRef Filename,
+                     MemoryBufferRef Buffer);
 
-  Error createReader(StringRef Filename, LVReaders &Readers, PdbOrObj &Input,
+  Error createReader(StringRef Filename, LVReaders &Readers, InputHandle &Input,
                      StringRef FileFormatName, StringRef ExePath = {});
 
 public:

llvm/include/llvm/DebugInfo/LogicalView/Readers/LVBinaryReader.h

@@ -25,6 +25,7 @@
 #include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/MC/TargetRegistry.h"
 #include "llvm/Object/COFF.h"
+#include "llvm/Object/IRObjectFile.h"
 #include "llvm/Object/ObjectFile.h"
 
 namespace llvm {