[LLVMbugs] [Bug 19563] New: .debug_ranges section is broken

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Fri Apr 25 12:04:58 PDT 2014


            Bug ID: 19563
           Summary: .debug_ranges section is broken
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: samsonov at google.com
                CC: dblaikie at gmail.com, echristo at gmail.com,
                    eugeni.stepanov at gmail.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

$ cat tmp/symbolizer/a.cc
#include <stdio.h>

void f() {
  int * volatile p = new int;
  if (*p)

int main(void) {
  return 0;

$ ./bin/clang++ -O2 -g -fsanitize=memory tmp/symbolizer/a.cc

$ readelf -wi a.out
 <1><104a1a>: Abbrev Number: 5 (DW_TAG_subprogram)
    <104a1b>   DW_AT_name        : (indirect string, offset: 0x352bf): main     
    <104a1f>   DW_AT_decl_file   : 1    
    <104a20>   DW_AT_decl_line   : 9    
    <104a21>   DW_AT_type        : <0x104a4f>   
    <104a25>   DW_AT_external    : 1    
    <104a25>   DW_AT_accessibility: 1   (public)
    <104a26>   DW_AT_low_pc      : 0x86570      
    <104a2e>   DW_AT_high_pc     : 0xb4 
    <104a32>   DW_AT_frame_base  : 1 byte block: 57     (DW_OP_reg7 (rsp))
    <104a34>   Unknown AT value: 3fe7: 1        
 <2><104a34>: Abbrev Number: 6 (DW_TAG_inlined_subroutine)
    <104a35>   DW_AT_abstract_origin: <0x1049ea>        
    <104a39>   DW_AT_ranges      : 0x5de90      
    <104a3d>   DW_AT_call_file   : 1    
    <104a3e>   DW_AT_call_line   : 10

$ readelf -wR a.out
    0005de90 000000000010ca46 000000000010cac4 
    0005de90 000000000010cada 000000000010cae4 
    0005de90 <End of list>

Address ranges for inlined subroutine in .debug_ranges are wrong.
The addresses in range list from .debug_ranges should be relative to
the base address (DW_AT_low_pc) of compilation unit that refers this range
list. In this example the addresses written in the binary are absolute. If I
subtract base address of an a.cc CU (0x864c0) from these addresses, range lists
become correct.

I haven't found a revision which broke this yet. Working on that.

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