kimanh created this revision.
kimanh added reviewers: labath, jasonmolenda.
kimanh added a project: LLDB.
Herald added subscribers: JDevlieghere, arphaman.
kimanh requested review of this revision.
Herald added a reviewer: jdoerfert.
Herald added subscribers: lldb-commits, sstefan1.
SymbolFileDWARF::ResolveSymbolContext is currently unaware that in DWARF5 the
primary file is specified at file index 0. As a result it misses to correctly
resolve the symbol context for the primary file when DWARF5 debug data is used
and the primary file is only specified at index 0.
This change makes use of CompileUnit::ResolveSymbolContext to resolve the
symbol context. The ResolveSymbolContext in CompileUnit has been previously
already updated to reflect changes in DWARF5
and contains a more readable version. It can resolve more, but will also do a
bit more work than
SymbolFileDWARF::ResolveSymbolContext (getting the Module, and going through
SymbolFileDWARF::ResolveSymbolContextForAddress), however, it's mostly directed
by $resolve_scope
what will be resolved, and ensures that code is easier to maintain if there's
only one path.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D98619
Files:
lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
lldb/source/Symbol/CompileUnit.cpp
lldb/test/Shell/SymbolFile/DWARF/dwarf5-debug_line-file-index.s
Index: lldb/test/Shell/SymbolFile/DWARF/dwarf5-debug_line-file-index.s
===================================================================
--- /dev/null
+++ lldb/test/Shell/SymbolFile/DWARF/dwarf5-debug_line-file-index.s
@@ -0,0 +1,134 @@
+# Test handling of DWARF5 file index 0.
+
+# REQUIRES: x86
+
+# RUN: llvm-mc -filetype=obj -o %t -triple x86_64-pc-linux %s
+# RUN: %lldb %t -o "image lookup -f hello.c -l 1" \
+# RUN: -o exit | FileCheck %s
+
+# CHECK: 2 matches found in hello.c:1
+ .text
+.Lfunc_begin0:
+ .file 0 "." "hello.c"
+ .loc 0 1 0 # hello.c:1:0
+ nop
+ .loc 0 1 13 prologue_end # hello.c:1:13
+ nop
+.Lfunc_end0:
+ .section .debug_abbrev,"",@progbits
+ .byte 1 # Abbreviation Code
+ .byte 17 # DW_TAG_compile_unit
+ .byte 1 # DW_CHILDREN_yes
+ .byte 37 # DW_AT_producer
+ .byte 37 # DW_FORM_strx1
+ .byte 19 # DW_AT_language
+ .byte 5 # DW_FORM_data2
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 114 # DW_AT_str_offsets_base
+ .byte 23 # DW_FORM_sec_offset
+ .byte 16 # DW_AT_stmt_list
+ .byte 23 # DW_FORM_sec_offset
+ .byte 27 # DW_AT_comp_dir
+ .byte 37 # DW_FORM_strx1
+ .byte 17 # DW_AT_low_pc
+ .byte 27 # DW_FORM_addrx
+ .byte 18 # DW_AT_high_pc
+ .byte 6 # DW_FORM_data4
+ .byte 115 # DW_AT_addr_base
+ .byte 23 # DW_FORM_sec_offset
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 2 # Abbreviation Code
+ .byte 46 # DW_TAG_subprogram
+ .byte 0 # DW_CHILDREN_no
+ .byte 17 # DW_AT_low_pc
+ .byte 27 # DW_FORM_addrx
+ .byte 18 # DW_AT_high_pc
+ .byte 6 # DW_FORM_data4
+ .byte 64 # DW_AT_frame_base
+ .byte 24 # DW_FORM_exprloc
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 58 # DW_AT_decl_file
+ .byte 11 # DW_FORM_data1
+ .byte 59 # DW_AT_decl_line
+ .byte 11 # DW_FORM_data1
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 63 # DW_AT_external
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 3 # Abbreviation Code
+ .byte 36 # DW_TAG_base_type
+ .byte 0 # DW_CHILDREN_no
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 62 # DW_AT_encoding
+ .byte 11 # DW_FORM_data1
+ .byte 11 # DW_AT_byte_size
+ .byte 11 # DW_FORM_data1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 0 # EOM(3)
+ .section .debug_info,"",@progbits
+.Lcu_begin0:
+ .long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
+.Ldebug_info_start0:
+ .short 5 # DWARF version number
+ .byte 1 # DWARF Unit Type
+ .byte 8 # Address Size (in bytes)
+ .long .debug_abbrev # Offset Into Abbrev. Section
+ .byte 1 # Abbrev [1] 0xc:0x2b DW_TAG_compile_unit
+ .byte 0 # DW_AT_producer
+ .short 12 # DW_AT_language
+ .byte 1 # DW_AT_name
+ .long .Lstr_offsets_base0 # DW_AT_str_offsets_base
+ .long .Lline_table_start0 # DW_AT_stmt_list
+ .byte 2 # DW_AT_comp_dir
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .long .Laddr_table_base0 # DW_AT_addr_base
+ .byte 2 # Abbrev [2] 0x23:0xf DW_TAG_subprogram
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .byte 1 # DW_AT_frame_base
+ .byte 86
+ .byte 3 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 1 # DW_AT_decl_line
+ .long 50 # DW_AT_type
+ # DW_AT_external
+ .byte 3 # Abbrev [3] 0x32:0x4 DW_TAG_base_type
+ .byte 4 # DW_AT_name
+ .byte 5 # DW_AT_encoding
+ .byte 4 # DW_AT_byte_size
+ .byte 0 # End Of Children Mark
+.Ldebug_info_end0:
+ .section .debug_str_offsets,"",@progbits
+ .long 24 # Length of String Offsets Set
+ .short 5
+ .short 0
+.Lstr_offsets_base0:
+ .section .debug_str,"MS",@progbits,1
+.Linfo_string0:
+ .asciz "" # string offset=0
+.Linfo_string1:
+ .asciz "hello.c" # string offset=101
+.Linfo_string2:
+ .asciz "." # string offset=109
+ .section .debug_str_offsets,"",@progbits
+ .long .Linfo_string0
+ .long .Linfo_string1
+ .long .Linfo_string2
+ .section .debug_addr,"",@progbits
+.Ldebug_addr_start0:
+ .short 5 # DWARF version number
+ .byte 8 # Address size
+ .byte 0 # Segment selector size
+.Laddr_table_base0:
+ .quad .Lfunc_begin0
+.Ldebug_addr_end0:
+ .section .debug_line,"",@progbits
+.Lline_table_start0:
\ No newline at end of file
Index: lldb/source/Symbol/CompileUnit.cpp
===================================================================
--- lldb/source/Symbol/CompileUnit.cpp
+++ lldb/source/Symbol/CompileUnit.cpp
@@ -248,6 +248,18 @@
if (!file_spec_matches_cu_file_spec && !check_inlines)
return;
+ SymbolContext sc(GetModule());
+ sc.comp_unit = this;
+
+ if (line == 0) {
+ if (file_spec_matches_cu_file_spec && !check_inlines) {
+ // only append the context if we aren't looking for inline call sites by
+ // file and line and if the file spec matches that of the compile unit
+ sc_list.Append(sc);
+ }
+ return;
+ }
+
uint32_t file_idx =
GetSupportFiles().FindFileIndex(0, file_spec, true);
while (file_idx != UINT32_MAX) {
@@ -259,23 +271,15 @@
if (num_file_indexes == 0)
return;
- SymbolContext sc(GetModule());
- sc.comp_unit = this;
+ LineTable *line_table = sc.comp_unit->GetLineTable();
- if (line == 0) {
+ if (line_table == nullptr) {
if (file_spec_matches_cu_file_spec && !check_inlines) {
- // only append the context if we aren't looking for inline call sites by
- // file and line and if the file spec matches that of the compile unit
sc_list.Append(sc);
}
return;
}
- LineTable *line_table = sc.comp_unit->GetLineTable();
-
- if (line_table == nullptr)
- return;
-
uint32_t line_idx;
LineEntry line_entry;
Index: lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
===================================================================
--- lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
+++ lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
@@ -1966,66 +1966,8 @@
bool file_spec_matches_cu_file_spec =
FileSpec::Match(file_spec, dc_cu->GetPrimaryFile());
if (check_inlines || file_spec_matches_cu_file_spec) {
- SymbolContext sc(m_objfile_sp->GetModule());
- sc.comp_unit = dc_cu;
- uint32_t file_idx = UINT32_MAX;
-
- // If we are looking for inline functions only and we don't find it
- // in the support files, we are done.
- if (check_inlines) {
- file_idx =
- sc.comp_unit->GetSupportFiles().FindFileIndex(1, file_spec, true);
- if (file_idx == UINT32_MAX)
- continue;
- }
-
- if (line != 0) {
- LineTable *line_table = sc.comp_unit->GetLineTable();
-
- if (line_table != nullptr && line != 0) {
- // We will have already looked up the file index if we are
- // searching for inline entries.
- if (!check_inlines)
- file_idx = sc.comp_unit->GetSupportFiles().FindFileIndex(
- 1, file_spec, true);
-
- if (file_idx != UINT32_MAX) {
- uint32_t found_line;
- uint32_t line_idx = line_table->FindLineEntryIndexByFileIndex(
- 0, file_idx, line, false, &sc.line_entry);
- found_line = sc.line_entry.line;
-
- while (line_idx != UINT32_MAX) {
- sc.function = nullptr;
- sc.block = nullptr;
- if (resolve_scope &
- (eSymbolContextFunction | eSymbolContextBlock)) {
- const lldb::addr_t file_vm_addr =
- sc.line_entry.range.GetBaseAddress().GetFileAddress();
- if (file_vm_addr != LLDB_INVALID_ADDRESS) {
- ResolveFunctionAndBlock(
- file_vm_addr, resolve_scope & eSymbolContextBlock, sc);
- }
- }
-
- sc_list.Append(sc);
- line_idx = line_table->FindLineEntryIndexByFileIndex(
- line_idx + 1, file_idx, found_line, true, &sc.line_entry);
- }
- }
- } else if (file_spec_matches_cu_file_spec && !check_inlines) {
- // only append the context if we aren't looking for inline call
- // sites by file and line and if the file spec matches that of
- // the compile unit
- sc_list.Append(sc);
- }
- } else if (file_spec_matches_cu_file_spec && !check_inlines) {
- // only append the context if we aren't looking for inline call
- // sites by file and line and if the file spec matches that of
- // the compile unit
- sc_list.Append(sc);
- }
-
+ dc_cu->ResolveSymbolContext(file_spec, line, check_inlines, false,
+ resolve_scope, sc_list);
if (!check_inlines)
break;
}
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