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llvm-symbolizer: Fix FRAME handling of missing AT_name.

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Summary:
llvm-symbolizer protocol is empty string means end-of-output.
Do not emit empty string when a function or a variable do not have a
name for any reason. Emit "??".

Reviewers: pcc, vitalybuka, jdoerfert

Subscribers: srhines, hiraditya, rupprecht, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D70626
This commit is contained in:
Evgenii Stepanov 2019-11-22 10:56:44 -08:00
parent e6c4702674
commit 6095bf0c46
2 changed files with 164 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
lib/DebugInfo/Symbolize/DIPrinter.cpp
View File

@ -118,21 +118,32 @@ DIPrinter &DIPrinter::operator<<(const DIGlobal &Global) {
}
DIPrinter &DIPrinter::operator<<(const DILocal &Local) {
if (Local.FunctionName.empty())
OS << "??\n";
else
OS << Local.FunctionName << '\n';
if (Local.Name.empty())
OS << "??\n";
else
OS << Local.Name << '\n';
if (Local.DeclFile.empty())
OS << "??";
else
OS << Local.DeclFile;
OS << ':' << Local.DeclLine << '\n';
if (Local.FrameOffset)
OS << *Local.FrameOffset << ' ';
else
OS << "?? ";
if (Local.Size)
OS << *Local.Size << ' ';
else
OS << "?? ";
if (Local.TagOffset)
OS << *Local.TagOffset << '\n';
else

151
test/tools/llvm-symbolizer/frame-noname.s Normal file
View File

@ -0,0 +1,151 @@
// A hand-crafted object with AT_name fields for the function and the variable commented out.
// REQUIRES: aarch64-registered-target
// RUN: llvm-mc -filetype=obj -triple=aarch64-linux-android -o %t.o %s
// RUN: echo 'FRAME %t.o 0' | llvm-symbolizer | FileCheck %s
// CHECK: ??
// CHECK-NEXT: ??
// CHECK-NEXT: /tmp/dbg.cc:2
// CHECK-NEXT: ?? ?? ??
.text
.file "dbg.cc"
.globl func // -- Begin function func
.p2align 2
.type func,@function
func: // @func
.Lfunc_begin0:
.file 1 "/tmp" "dbg.cc"
.loc 1 1 0 // /tmp/dbg.cc:1:0
.cfi_sections .debug_frame
.cfi_startproc
// %bb.0: // %entry
.loc 1 3 1 prologue_end // /tmp/dbg.cc:3:1
ret
.Ltmp0:
.Lfunc_end0:
.size func, .Lfunc_end0-func
.cfi_endproc
// -- End function
.section .debug_str,"MS",@progbits,1
.Linfo_string0:
.asciz "clang version 10.0.0 (git@github.com:llvm/llvm-project.git 2102f157f2d1ca6e7e4432b91d75f04e5023172f)" // string offset=0
.Linfo_string1:
.asciz "/tmp/dbg.cc" // string offset=101
.Linfo_string2:
.asciz "/code/build-llvm-cmake" // string offset=113
.Linfo_string3:
.asciz "func" // string offset=136
.Linfo_string4:
.asciz "x" // string offset=141
.Linfo_string5:
.asciz "int" // string offset=143
.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 14 // DW_FORM_strp
.byte 19 // DW_AT_language
.byte 5 // DW_FORM_data2
.byte 3 // DW_AT_name
.byte 14 // DW_FORM_strp
.byte 16 // DW_AT_stmt_list
.byte 23 // DW_FORM_sec_offset
.byte 27 // DW_AT_comp_dir
.byte 14 // DW_FORM_strp
.byte 17 // DW_AT_low_pc
.byte 1 // DW_FORM_addr
.byte 18 // DW_AT_high_pc
.byte 6 // DW_FORM_data4
.byte 0 // EOM(1)
.byte 0 // EOM(2)
.byte 2 // Abbreviation Code
.byte 46 // DW_TAG_subprogram
.byte 1 // DW_CHILDREN_yes
.byte 17 // DW_AT_low_pc
.byte 1 // DW_FORM_addr
.byte 18 // DW_AT_high_pc
.byte 6 // DW_FORM_data4
.byte 64 // DW_AT_frame_base
.byte 24 // DW_FORM_exprloc
.ascii "\227B" // DW_AT_GNU_all_call_sites
.byte 25 // DW_FORM_flag_present
// .byte 3 // DW_AT_name
// .byte 14 // DW_FORM_strp
.byte 58 // DW_AT_decl_file
.byte 11 // DW_FORM_data1
.byte 59 // DW_AT_decl_line
.byte 11 // DW_FORM_data1
.byte 63 // DW_AT_external
.byte 25 // DW_FORM_flag_present
.byte 0 // EOM(1)
.byte 0 // EOM(2)
.byte 3 // Abbreviation Code
.byte 52 // DW_TAG_variable
.byte 0 // DW_CHILDREN_no
// .byte 3 // DW_AT_name
// .byte 14 // DW_FORM_strp
.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 0 // EOM(1)
.byte 0 // EOM(2)
.byte 4 // Abbreviation Code
.byte 36 // DW_TAG_base_type
.byte 0 // DW_CHILDREN_no
.byte 3 // DW_AT_name
.byte 14 // DW_FORM_strp
.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:
.word .Ldebug_info_end0-.Ldebug_info_start0 // Length of Unit
.Ldebug_info_start0:
.hword 4 // DWARF version number
.word .debug_abbrev // Offset Into Abbrev. Section
.byte 8 // Address Size (in bytes)
.byte 1 // Abbrev [1] 0xb:0x48 DW_TAG_compile_unit
.word .Linfo_string0 // DW_AT_producer
.hword 33 // DW_AT_language
.word .Linfo_string1 // DW_AT_name
.word .Lline_table_start0 // DW_AT_stmt_list
.word .Linfo_string2 // DW_AT_comp_dir
.xword .Lfunc_begin0 // DW_AT_low_pc
.word .Lfunc_end0-.Lfunc_begin0 // DW_AT_high_pc
.byte 2 // Abbrev [2] 0x2a:0x21 DW_TAG_subprogram
.xword .Lfunc_begin0 // DW_AT_low_pc
.word .Lfunc_end0-.Lfunc_begin0 // DW_AT_high_pc
.byte 1 // DW_AT_frame_base
.byte 111
// DW_AT_GNU_all_call_sites
// .word .Linfo_string3 // DW_AT_name
.byte 1 // DW_AT_decl_file
.byte 1 // DW_AT_decl_line
// DW_AT_external
.byte 3 // Abbrev [3] 0x3f:0xb DW_TAG_variable
// .word .Linfo_string4 // DW_AT_name
.byte 1 // DW_AT_decl_file
.byte 2 // DW_AT_decl_line
.word 75 // DW_AT_type
.byte 0 // End Of Children Mark
.byte 4 // Abbrev [4] 0x4b:0x7 DW_TAG_base_type
.word .Linfo_string5 // DW_AT_name
.byte 5 // DW_AT_encoding
.byte 4 // DW_AT_byte_size
.byte 0 // End Of Children Mark
.Ldebug_info_end0:
.ident "clang version 10.0.0 (git@github.com:llvm/llvm-project.git 2102f157f2d1ca6e7e4432b91d75f04e5023172f)"
.section ".note.GNU-stack","",@progbits
.section .debug_line,"",@progbits
.Lline_table_start0: