shafik updated this revision to Diff 243678.
shafik marked 5 inline comments as done.
shafik added a comment.
Herald added a reviewer: jdoerfert.
Updated approach based on comments and added test for the new approach.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D73921/new/
https://reviews.llvm.org/D73921
Files:
lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
lldb/test/Shell/SymbolFile/DWARF/missing_dw_at_name_error.s
Index: lldb/test/Shell/SymbolFile/DWARF/missing_dw_at_name_error.s
===================================================================
--- /dev/null
+++ lldb/test/Shell/SymbolFile/DWARF/missing_dw_at_name_error.s
@@ -0,0 +1,203 @@
+# This test verifies that we catch that a subprogram is missing a DW_AT_name
+# during processing.
+
+# REQUIRES: x86
+
+# RUN: llvm-mc -triple x86_64-apple-macosx10.14.0 %s -filetype=obj > %t.o
+# RUN: lldb-test symbols --dump-clang-ast %t.o 2>&1 | FileCheck %s
+
+# CHECK: DWARF validation error: DW_TAG_subprogram without DW_AT_name
+
+# Generated from:
+#
+# int f() {
+# return 1;
+# }
+#
+# The debug-info was modified by hand.
+ .section __TEXT,__text,regular,pure_instructions
+ .build_version macos, 10, 14 sdk_version 10, 14
+ .globl __Z1fv ## -- Begin function _Z1fv
+ .p2align 4, 0x90
+__Z1fv: ## @_Z1fv
+Lfunc_begin0:
+ .file 1 "/Users/shafik/code" "simple_function.cpp"
+ .loc 1 1 0 ## simple_function.cpp:1:0
+ .cfi_startproc
+## %bb.0:
+ pushq %rbp
+ .cfi_def_cfa_offset 16
+ .cfi_offset %rbp, -16
+ movq %rsp, %rbp
+ .cfi_def_cfa_register %rbp
+Ltmp0:
+ .loc 1 2 3 prologue_end ## simple_function.cpp:2:3
+ movl $1, %eax
+ popq %rbp
+ retq
+Ltmp1:
+Lfunc_end0:
+ .cfi_endproc
+ ## -- End function
+ .section __DWARF,__debug_str,regular,debug
+Linfo_string:
+ .asciz "Apple clang version 11.0.0 (clang-1100.0.31.5)" ## string offset=0
+ .asciz "simple_function.cpp" ## string offset=47
+ .asciz "/Users/shafik/code" ## string offset=67
+ .asciz "f" ## string offset=86
+ .asciz "_Z1fv" ## string offset=88
+ .asciz "int" ## string offset=94
+ .section __DWARF,__debug_abbrev,regular,debug
+Lsection_abbrev:
+ .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
+ .ascii "\264B" ## DW_AT_GNU_pubnames
+ .byte 25 ## DW_FORM_flag_present
+ .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 0 ## DW_CHILDREN_no
+ .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
+ .byte 110 ## DW_AT_linkage_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 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 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 __DWARF,__debug_info,regular,debug
+Lsection_info:
+Lcu_begin0:
+.set Lset0, Ldebug_info_end0-Ldebug_info_start0 ## Length of Unit
+ .long Lset0
+Ldebug_info_start0:
+ .short 4 ## DWARF version number
+.set Lset1, Lsection_abbrev-Lsection_abbrev ## Offset Into Abbrev. Section
+ .long Lset1
+ .byte 8 ## Address Size (in bytes)
+ .byte 1 ## Abbrev [1] 0xb:0x44 DW_TAG_compile_unit
+ .long 0 ## DW_AT_producer
+ .short 4 ## DW_AT_language
+ .long 47 ## DW_AT_name
+.set Lset2, Lline_table_start0-Lsection_line ## DW_AT_stmt_list
+ .long Lset2
+ .long 67 ## DW_AT_comp_dir
+ ## DW_AT_GNU_pubnames
+ .quad Lfunc_begin0 ## DW_AT_low_pc
+.set Lset3, Lfunc_end0-Lfunc_begin0 ## DW_AT_high_pc
+ .long Lset3
+ .byte 2 ## Abbrev [2] 0x2a:0x1d DW_TAG_subprogram
+ .quad Lfunc_begin0 ## DW_AT_low_pc
+.set Lset4, Lfunc_end0-Lfunc_begin0 ## DW_AT_high_pc
+ .long Lset4
+ .byte 1 ## DW_AT_frame_base
+ .byte 86
+ .long 88 ## DW_AT_linkage_name
+ .byte 1 ## DW_AT_decl_file
+ .byte 1 ## DW_AT_decl_line
+ .long 71 ## DW_AT_type
+ ## DW_AT_external
+ .byte 3 ## Abbrev [3] 0x47:0x7 DW_TAG_base_type
+ .long 94 ## DW_AT_name
+ .byte 5 ## DW_AT_encoding
+ .byte 4 ## DW_AT_byte_size
+ .byte 0 ## End Of Children Mark
+Ldebug_info_end0:
+ .section __DWARF,__debug_macinfo,regular,debug
+Ldebug_macinfo:
+ .byte 0 ## End Of Macro List Mark
+ .section __DWARF,__apple_objc,regular,debug
+Lobjc_begin:
+ .long 1212240712 ## Header Magic
+ .short 1 ## Header Version
+ .short 0 ## Header Hash Function
+ .long 1 ## Header Bucket Count
+ .long 0 ## Header Hash Count
+ .long 12 ## Header Data Length
+ .long 0 ## HeaderData Die Offset Base
+ .long 1 ## HeaderData Atom Count
+ .short 1 ## DW_ATOM_die_offset
+ .short 6 ## DW_FORM_data4
+ .long -1 ## Bucket 0
+ .section __DWARF,__apple_namespac,regular,debug
+Lnamespac_begin:
+ .long 1212240712 ## Header Magic
+ .short 1 ## Header Version
+ .short 0 ## Header Hash Function
+ .long 1 ## Header Bucket Count
+ .long 0 ## Header Hash Count
+ .long 12 ## Header Data Length
+ .long 0 ## HeaderData Die Offset Base
+ .long 1 ## HeaderData Atom Count
+ .short 1 ## DW_ATOM_die_offset
+ .short 6 ## DW_FORM_data4
+ .long -1 ## Bucket 0
+ .section __DWARF,__debug_gnu_pubn,regular,debug
+.set Lset8, LpubNames_end0-LpubNames_begin0 ## Length of Public Names Info
+ .long Lset8
+LpubNames_begin0:
+ .short 2 ## DWARF Version
+.set Lset9, Lcu_begin0-Lsection_info ## Offset of Compilation Unit Info
+ .long Lset9
+ .long 79 ## Compilation Unit Length
+ .long 42 ## DIE offset
+ .byte 48 ## Attributes: FUNCTION, EXTERNAL
+ .asciz "f" ## External Name
+ .long 0 ## End Mark
+LpubNames_end0:
+ .section __DWARF,__debug_gnu_pubt,regular,debug
+.set Lset10, LpubTypes_end0-LpubTypes_begin0 ## Length of Public Types Info
+ .long Lset10
+LpubTypes_begin0:
+ .short 2 ## DWARF Version
+.set Lset11, Lcu_begin0-Lsection_info ## Offset of Compilation Unit Info
+ .long Lset11
+ .long 79 ## Compilation Unit Length
+ .long 71 ## DIE offset
+ .byte 144 ## Attributes: TYPE, STATIC
+ .asciz "int" ## External Name
+ .long 0 ## End Mark
+LpubTypes_end0:
+
+.subsections_via_symbols
+ .section __DWARF,__debug_line,regular,debug
+Lsection_line:
+Lline_table_start0:
Index: lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
===================================================================
--- lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
+++ lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
@@ -828,6 +828,11 @@
SymbolFileDWARF *dwarf = die.GetDWARF();
const dw_tag_t tag = die.Tag();
+ if (tag == DW_TAG_subprogram && !attrs.name) {
+ dwarf->GetObjectFile()->GetModule()->ReportError(
+ "DWARF validation error: DW_TAG_subprogram without DW_AT_name");
+ }
+
bool is_variadic = false;
bool is_static = false;
bool has_template_params = false;
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