[PATCH] D76498: [DWARF] Fix v5 debug_line parsing of prologues with many files

[Pavel Labath via Phabricator via llvm-commits]

labath updated this revision to Diff 251970.
labath added a comment.

- rename test, add comment


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D76498/new/

https://reviews.llvm.org/D76498

Files:
  llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp
  llvm/test/tools/llvm-dwarfdump/X86/debug_line_many_files_v5.s


Index: llvm/test/tools/llvm-dwarfdump/X86/debug_line_many_files_v5.s
===================================================================
--- /dev/null
+++ llvm/test/tools/llvm-dwarfdump/X86/debug_line_many_files_v5.s
@@ -0,0 +1,67 @@
+## A file with many files and directories in a single debug_line contribution
+## meant to test the handling of directory_count and file_name_count fields.
+
+# RUN: llvm-mc -triple x86_64-pc-linux -filetype=obj %s -o %t
+# RUN: llvm-dwarfdump -debug-line %t | FileCheck %s
+
+# CHECK:      include_directories[  0] = "/d000"
+# CHECK:      include_directories[299] = "/d299"
+# CHECK:      file_names[  0]:
+# CHECK-NEXT:            name: "000.c"
+# CHECK-NEXT:       dir_index: 0
+# CHECK:      file_names[299]:
+# CHECK-NEXT:            name: "299.c"
+# CHECK-NEXT:       dir_index: 299
+
+.section .debug_line,"", at progbits
+.long   .Lunit_end0-.Lunit_start0   # Length of Unit
+.Lunit_start0:
+.short  5               # DWARF version number
+.byte   8               # Address Size
+.byte   0               # Segment Selector Size
+.long   .Lunit_header_end0 - .Lunit_params0 # Length of Prologue (invalid)
+.Lunit_params0:
+.byte   1               # Minimum Instruction Length
+.byte   1               # Maximum Operations per Instruction
+.byte   1               # Default is_stmt
+.byte   -5              # Line Base
+.byte   14              # Line Range
+.byte   13              # Opcode Base
+.byte   0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1 # Standard Opcode Lengths
+
+# Directory table format
+.byte   1               # One element per directory entry
+.byte   1               # DW_LNCT_path
+.byte   0x08            # DW_FORM_string
+
+# Directory table entries
+.uleb128 300            # 300 directories
+.irpc a,012
+.irpc b,0123456789
+.irpc c,0123456789
+.byte '/', 'd', '0'+\a, '0'+\b, '0'+\c, 0
+.endr
+.endr
+.endr
+
+# File table format
+.byte   2               # 2 elements per file entry
+.byte   1               # DW_LNCT_path
+.byte   0x08            # DW_FORM_string
+.byte   2               # DW_LNCT_directory_index
+.byte   0x05            # DW_FORM_data2
+
+# File table entries
+.uleb128 300            # 300 files
+.irpc a,012
+.irpc b,0123456789
+.irpc c,0123456789
+.byte '0'+\a, '0'+\b, '0'+\c, '.', 'c', 0 # File name
+.word \a*100+\b*10+\c   # Dir index
+.endr
+.endr
+.endr
+
+.Lunit_header_end0:
+.byte   0, 1, 1         # DW_LNE_end_sequence
+.Lunit_end0:
Index: llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp
===================================================================
--- llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp
+++ llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp
@@ -255,8 +255,8 @@
     return DirDescriptors.takeError();
 
   // Get the directory entries, according to the format described above.
-  int DirEntryCount = DebugLineData.getU8(OffsetPtr);
-  for (int I = 0; I != DirEntryCount; ++I) {
+  uint64_t DirEntryCount = DebugLineData.getULEB128(OffsetPtr);
+  for (uint64_t I = 0; I != DirEntryCount; ++I) {
     for (auto Descriptor : *DirDescriptors) {
       DWARFFormValue Value(Descriptor.Form);
       switch (Descriptor.Type) {
@@ -283,8 +283,8 @@
     return FileDescriptors.takeError();
 
   // Get the file entries, according to the format described above.
-  int FileEntryCount = DebugLineData.getU8(OffsetPtr);
-  for (int I = 0; I != FileEntryCount; ++I) {
+  uint64_t FileEntryCount = DebugLineData.getULEB128(OffsetPtr);
+  for (uint64_t I = 0; I != FileEntryCount; ++I) {
     DWARFDebugLine::FileNameEntry FileEntry;
     for (auto Descriptor : *FileDescriptors) {
       DWARFFormValue Value(Descriptor.Form);


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