On Linux/x86, assembler generates bogus line debug info
with gas/i386/dw2-compress-1.s:
[...@gnu-6 compresss-1]$ make dw2-compress-1a.o
./as -o dw2-compress-1a.o dw2-compress-1.s
[...@gnu-6 compresss-1]$ ./readelf -wl dw2-compress-1a.o
Raw dump of debug contents of section .debug_line:
Offset: 0x0
Length: 62
DWARF Version: 2
Prologue Length: 35
Minimum Instruction Length: 1
Initial value of 'is_stmt': 1
Line Base: 1
Line Range: 1
Opcode Base: 16
Opcodes:
Opcode 1 has 0 args
Opcode 2 has 1 args
Opcode 3 has 1 args
Opcode 4 has 1 args
Opcode 5 has 1 args
Opcode 6 has 0 args
Opcode 7 has 0 args
Opcode 8 has 0 args
Opcode 9 has 1 args
Opcode 10 has 0 args
Opcode 11 has 0 args
Opcode 12 has 1 args
Opcode 13 has 0 args
Opcode 14 has 0 args
Opcode 15 has 0 args
The Directory Table is empty.
The File Name Table:
Entry Dir Time Size Name
1 0 0 0 file1.txt
Line Number Statements:
Extended opcode 2: set Address to 0x0
Advance Line by 3 to 4
Copy
Copy
Extended opcode 2: set Address to 0x4
Extended opcode 1: End of Sequence
Offset: 0x42
Length: 25
DWARF Version: 2
Prologue Length: 19
Minimum Instruction Length: 1
Initial value of 'is_stmt': 1
Line Base: -5
Line Range: 14
Opcode Base: 13
Opcodes:
Opcode 1 has 0 args
Opcode 2 has 1 args
Opcode 3 has 1 args
Opcode 4 has 1 args
Opcode 5 has 1 args
Opcode 6 has 0 args
Opcode 7 has 0 args
Opcode 8 has 0 args
Opcode 9 has 1 args
Opcode 10 has 0 args
Opcode 11 has 0 args
Opcode 12 has 1 args
The Directory Table is empty.
The File Name Table is empty.
Line Number Statements:
[...@gnu-6 compresss-1]$
But
---
Offset: 0x42
Length: 25
DWARF Version: 2
Prologue Length: 19
Minimum Instruction Length: 1
Initial value of 'is_stmt': 1
Line Base: -5
Line Range: 14
Opcode Base: 13
Opcodes:
Opcode 1 has 0 args
Opcode 2 has 1 args
Opcode 3 has 1 args
Opcode 4 has 1 args
Opcode 5 has 1 args
Opcode 6 has 0 args
Opcode 7 has 0 args
Opcode 8 has 0 args
Opcode 9 has 1 args
Opcode 10 has 0 args
Opcode 11 has 0 args
Opcode 12 has 1 args
The Directory Table is empty.
The File Name Table is empty.
Line Number Statements:
----
aren't in assembly input. They are generated by dwarf2_finish,
which puts bogus line debug info into .debug_line section even
when it isn't empty. This bug can be fixed by the same patch for
PR 10531.
--
Summary: Bogus line debug info
Product: binutils
Version: 2.21 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gas
AssignedTo: unassigned at sources dot redhat dot com
ReportedBy: hjl dot tools at gmail dot com
CC: bug-binutils at gnu dot org
http://sourceware.org/bugzilla/show_bug.cgi?id=11789
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