http://llvm.org/bugs/show_bug.cgi?id=21328
Bug ID: 21328
Summary: Un-necessary relocations generated for local label
subtractions in apple_xxx debug sections
Product: new-bugs
Version: trunk
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Nothing special source-code-wise.
$ ./Release+Asserts/bin/clang --version
clang version 3.6.0 (trunk 220265)
Target: x86_64-apple-darwin12.5.0
x86_64-apple-darwin12
./Release+Asserts/bin/clang /test/relocs-1.c -save-temps -O1 -g -c -o rl1.o
Asm excerpt:
=====
.section __DWARF,__apple_types,regular,debug
Ltypes_begin:
.long 1212240712 ## Header Magic
.short 1 ## Header Version
.short 0 ## Header Hash Function
.long 3 ## Header Bucket Count
.long 3 ## Header Hash Count
.long 20 ## Header Data Length
.long 0 ## HeaderData Die Offset Base
.long 3 ## HeaderData Atom Count
.short 1 ## DW_ATOM_die_offset
.short 6 ## DW_FORM_data4
.short 3 ## DW_ATOM_die_tag
.short 5 ## DW_FORM_data2
.short 4 ## DW_ATOM_type_flags
.short 11 ## DW_FORM_data1
.long -1 ## Bucket 0
.long -1 ## Bucket 1
.long 0 ## Bucket 2
.long 193495088 ## Hash in Bucket 2
.long 2090805233 ## Hash in Bucket 2
.long 2090147939 ## Hash in Bucket 2
.long Ltypes0-Ltypes_begin ## Offset in Bucket 2
.long Ltypes1-Ltypes_begin ## Offset in Bucket 2
.long Ltypes2-Ltypes_begin ## Offset in Bucket 2
Ltypes0:
Lset29 = Linfo_string4-Linfo_string ## int
.long Lset29
.long 1 ## Num DIEs
.long 65
.short 36
.byte 0
.long 0
Ltypes1:
Lset30 = Linfo_string7-Linfo_string ## vPtr
.long Lset30
.long 1 ## Num DIEs
.long 116
.short 22
.byte 0
.long 0
Ltypes2:
Lset31 = Linfo_string16-Linfo_string ## char
.long Lset31
.long 1 ## Num DIEs
.long 305
.short 36
.byte 0
.long 0
===
despite the fact that the labels are in the same section and there are no
externally-visible ones to cause the section to be split into atoms.
we're generating:
otool -rv rl1.o:
Relocation information (__DWARF,__apple_types) 6 entries
address pcrel length extern type scattered symbolnum/value
00000048 False long False SUB False 15 (__DWARF,__apple_types)
00000048 False long False UNSIGND False 15 (__DWARF,__apple_types)
00000044 False long False SUB False 15 (__DWARF,__apple_types)
00000044 False long False UNSIGND False 15 (__DWARF,__apple_types)
00000040 False long False SUB False 15 (__DWARF,__apple_types)
00000040 False long False UNSIGND False 15 (__DWARF,__apple_types)
--
You are receiving this mail because:
You are on the CC list for the bug.
_______________________________________________
LLVMbugs mailing list
[email protected]
http://lists.cs.uiuc.edu/mailman/listinfo/llvmbugs
