[PATCH] D38240: [dwarfdump] Add support for -debug-line=OFFSET

[Jonas Devlieghere via Phabricator via llvm-commits]

JDevlieghere created this revision.

This patch adds support for passing an OFFSET to -debug-line.


Repository:
  rL LLVM

https://reviews.llvm.org/D38240

Files:
  lib/DebugInfo/DWARF/DWARFContext.cpp
  test/tools/llvm-dwarfdump/X86/debug_line_offset.test


Index: test/tools/llvm-dwarfdump/X86/debug_line_offset.test
===================================================================
--- /dev/null
+++ test/tools/llvm-dwarfdump/X86/debug_line_offset.test
@@ -0,0 +1,28 @@
+RUN: llvm-dwarfdump %S/../../dsymutil/Inputs/basic-lto-dw4.macho.x86_64.o \
+RUN:  -debug-line=0x0 | FileCheck %s --check-prefix=CHECK-A
+
+CHECK-A: debug_line[0000000000000000]
+CHECK-A: Address            Line   Column File   ISA Discriminator Flags
+CHECK-A-NET: ------------------ ------ ------ ------ --- ------------- -------------
+CHECK-A-NET: 0x0000000000000000     26      0      1   0             0  is_stmt
+CHECK-A-NET: 0x0000000000000004     27     10      1   0             0  is_stmt prologue_end
+CHECK-A-NET: 0x0000000000000009     27      3      1   0             0
+CHECK-A-NET: 0x0000000000000074     27      3      1   0             0  end_sequence
+CHECK-A-NOT: debug_line[000000000000009a]
+
+RUN: llvm-dwarfdump %S/../../dsymutil/Inputs/basic-lto-dw4.macho.x86_64.o \
+RUN:  -debug-line=0x9a | FileCheck %s --check-prefix=CHECK-B
+
+CHECK-B-NOT: debug_line[0000000000000000]
+CHECK-B: debug_line[000000000000009a]
+CHECK-B: Address            Line   Column File   ISA Discriminator Flags
+CHECK-B-NEXT: ------------------ ------ ------ ------ --- ------------- -------------
+CHECK-B-NEXT: 0x0000000000000050     16      0      1   0             0  is_stmt
+CHECK-B-NEXT: 0x0000000000000054     12     10      1   0             0  is_stmt prologue_end
+CHECK-B-NEXT: 0x000000000000005a     17      7      1   0             0  is_stmt
+CHECK-B-NEXT: 0x000000000000005f     12     10      1   0             0  is_stmt
+CHECK-B-NEXT: 0x0000000000000067     20      1      1   0             0  is_stmt
+CHECK-B-NEXT: 0x0000000000000069     19     18      1   0             0  is_stmt
+CHECK-B-NEXT: 0x000000000000006b     19     10      1   0             0
+CHECK-B-NEXT: 0x0000000000000072     20      1      1   0             0  is_stmt
+CHECK-B-NEXT: 0x0000000000000074     20      1      1   0             0  is_stmt end_sequence
Index: lib/DebugInfo/DWARF/DWARFContext.cpp
===================================================================
--- lib/DebugInfo/DWARF/DWARFContext.cpp
+++ lib/DebugInfo/DWARF/DWARFContext.cpp
@@ -331,12 +331,15 @@
       if (!CUDIE)
         continue;
       if (auto StmtOffset = toSectionOffset(CUDIE.find(DW_AT_stmt_list))) {
+        if (DumpOffset && *StmtOffset != *DumpOffset)
+          continue;
         DWARFDataExtractor lineData(*DObj, DObj->getLineSection(),
                                     isLittleEndian(), savedAddressByteSize);
         DWARFDebugLine::LineTable LineTable;
         uint32_t Offset = *StmtOffset;
         // Verbose dumping is done during parsing and not on the intermediate
         // representation.
+        OS << "debug_line[" << format("%16.16" PRIx64, Offset) << "]\n";
         if (DumpOpts.Verbose) {
           LineTable.parse(lineData, &Offset, &OS);
         } else {


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