76c0063eeb
String tables in unstripped executable files are fairly large in size. For example, lld's executable file is about 34.4 MB in my environment, and of which 3.5 MB is the string table. Efficiency of string table construction matters. Previously, the string table was built in an inefficient way. We used StringTableBuilder to build that and enabled string tail merging, although tail merging is not effective for the symbol table (you can only make the string table 0.3% smaller for lld.) Tail merging is computation intensive task and slow. This patch eliminates string tail merging. I changed the way of adding strings to the string table in this patch too. Previously, strings were added using add() and the same strings were then passed to getOffset() to get their offsets in the string table. In this way, getOffset() needs to look up a hash table to get offsets for given strings. This is a violation of "we look up the symbol table (or a hash table) only once for each symbol" dogma of the new LLD's design. Hash table lookup for long C++ mangled names is slow. I eliminated that lookup in this patch. In total, this patch improves link time of lld itself about 12% (3.50 seconds -> 3.08 seconds.) llvm-svn: 257017
261 lines
7.9 KiB
ArmAsm
261 lines
7.9 KiB
ArmAsm
# RUN: llvm-mc -filetype=obj -triple=powerpc64-unknown-linux %s -o %t
|
|
# RUN: ld.lld -discard-all %t -o %t2
|
|
# RUN: llvm-readobj -file-headers -sections -section-data -program-headers %t2 | FileCheck %s
|
|
# REQUIRES: ppc
|
|
|
|
# exits with return code 42 on linux
|
|
.section ".opd","aw"
|
|
.global _start
|
|
_start:
|
|
.quad .Lfoo,.TOC.@tocbase,0
|
|
|
|
# generate .toc and .toc1 sections to make sure that the ordering is as
|
|
# intended (.toc before .toc1, and both before .opd).
|
|
.section ".toc1","aw"
|
|
.quad 22, 37, 89, 47
|
|
|
|
.section ".toc","aw"
|
|
.quad 45, 86, 72, 24
|
|
|
|
.text
|
|
.Lfoo:
|
|
li 0,1
|
|
li 3,42
|
|
sc
|
|
|
|
# CHECK: ElfHeader {
|
|
# CHECK-NEXT: Ident {
|
|
# CHECK-NEXT: Magic: (7F 45 4C 46)
|
|
# CHECK-NEXT: Class: 64-bit (0x2)
|
|
# CHECK-NEXT: DataEncoding: BigEndian (0x2)
|
|
# CHECK-NEXT: FileVersion: 1
|
|
# CHECK-NEXT: OS/ABI: SystemV (0x0)
|
|
# CHECK-NEXT: ABIVersion: 0
|
|
# CHECK-NEXT: Unused: (00 00 00 00 00 00 00)
|
|
# CHECK-NEXT: }
|
|
# CHECK-NEXT: Type: Executable (0x2)
|
|
# CHECK-NEXT: Machine: EM_PPC64 (0x15)
|
|
# CHECK-NEXT: Version: 1
|
|
# CHECK-NEXT: Entry: 0x10020040
|
|
# CHECK-NEXT: ProgramHeaderOffset: 0x40
|
|
# CHECK-NEXT: SectionHeaderOffset: 0x200C8
|
|
# CHECK-NEXT: Flags [ (0x0)
|
|
# CHECK-NEXT: ]
|
|
# CHECK-NEXT: HeaderSize: 64
|
|
# CHECK-NEXT: ProgramHeaderEntrySize: 56
|
|
# CHECK-NEXT: ProgramHeaderCount: 5
|
|
# CHECK-NEXT: SectionHeaderEntrySize: 64
|
|
# CHECK-NEXT: SectionHeaderCount: 8
|
|
# CHECK-NEXT: StringTableSectionIndex: 6
|
|
# CHECK-NEXT: }
|
|
# CHECK-NEXT: Sections [
|
|
# CHECK-NEXT: Section {
|
|
# CHECK-NEXT: Index: 0
|
|
# CHECK-NEXT: Name: (0)
|
|
# CHECK-NEXT: Type: SHT_NULL (0x0)
|
|
# CHECK-NEXT: Flags [ (0x0)
|
|
# CHECK-NEXT: ]
|
|
# CHECK-NEXT: Address: 0x0
|
|
# CHECK-NEXT: Offset: 0x0
|
|
# CHECK-NEXT: Size: 0
|
|
# CHECK-NEXT: Link: 0
|
|
# CHECK-NEXT: Info: 0
|
|
# CHECK-NEXT: AddressAlignment: 0
|
|
# CHECK-NEXT: EntrySize: 0
|
|
# CHECK-NEXT: SectionData (
|
|
# CHECK-NEXT: )
|
|
# CHECK-NEXT: }
|
|
# CHECK-NEXT: Section {
|
|
# CHECK-NEXT: Index: 1
|
|
# CHECK-NEXT: Name: .text (1)
|
|
# CHECK-NEXT: Type: SHT_PROGBITS (0x1)
|
|
# CHECK-NEXT: Flags [ (0x6)
|
|
# CHECK-NEXT: SHF_ALLOC (0x2)
|
|
# CHECK-NEXT: SHF_EXECINSTR (0x4)
|
|
# CHECK-NEXT: ]
|
|
# CHECK-NEXT: Address: 0x10010000
|
|
# CHECK-NEXT: Offset: 0x10000
|
|
# CHECK-NEXT: Size: 12
|
|
# CHECK-NEXT: Link: 0
|
|
# CHECK-NEXT: Info: 0
|
|
# CHECK-NEXT: AddressAlignment: 4
|
|
# CHECK-NEXT: EntrySize: 0
|
|
# CHECK-NEXT: SectionData (
|
|
# CHECK: )
|
|
# CHECK-NEXT: }
|
|
# CHECK-NEXT: Section {
|
|
# CHECK-NEXT: Index: 2
|
|
# CHECK-NEXT: Name: .toc
|
|
# CHECK-NEXT: Type: SHT_PROGBITS (0x1)
|
|
# CHECK-NEXT: Flags [ (0x3)
|
|
# CHECK-NEXT: SHF_ALLOC (0x2)
|
|
# CHECK-NEXT: SHF_WRITE (0x1)
|
|
# CHECK-NEXT: ]
|
|
# CHECK-NEXT: Address: 0x10020000
|
|
# CHECK-NEXT: Offset: 0x20000
|
|
# CHECK-NEXT: Size: 32
|
|
# CHECK-NEXT: Link: 0
|
|
# CHECK-NEXT: Info: 0
|
|
# CHECK-NEXT: AddressAlignment: 1
|
|
# CHECK-NEXT: EntrySize: 0
|
|
# CHECK-NEXT: SectionData (
|
|
# CHECK-NEXT: 0000: 00000000 0000002D 00000000 00000056 |.......-.......V|
|
|
# CHECK-NEXT: 0010: 00000000 00000048 00000000 00000018 |.......H........|
|
|
# CHECK-NEXT: )
|
|
# CHECK-NEXT: }
|
|
# CHECK-NEXT: Section {
|
|
# CHECK-NEXT: Index: 3
|
|
# CHECK-NEXT: Name: .toc1
|
|
# CHECK-NEXT: Type: SHT_PROGBITS (0x1)
|
|
# CHECK-NEXT: Flags [ (0x3)
|
|
# CHECK-NEXT: SHF_ALLOC (0x2)
|
|
# CHECK-NEXT: SHF_WRITE (0x1)
|
|
# CHECK-NEXT: ]
|
|
# CHECK-NEXT: Address: 0x10020020
|
|
# CHECK-NEXT: Offset: 0x20020
|
|
# CHECK-NEXT: Size: 32
|
|
# CHECK-NEXT: Link: 0
|
|
# CHECK-NEXT: Info: 0
|
|
# CHECK-NEXT: AddressAlignment: 1
|
|
# CHECK-NEXT: EntrySize: 0
|
|
# CHECK-NEXT: SectionData (
|
|
# CHECK-NEXT: 0000: 00000000 00000016 00000000 00000025 |...............%|
|
|
# CHECK-NEXT: 0010: 00000000 00000059 00000000 0000002F |.......Y......./|
|
|
# CHECK-NEXT: )
|
|
# CHECK-NEXT: }
|
|
# CHECK-NEXT: Section {
|
|
# CHECK-NEXT: Index: 4
|
|
# CHECK-NEXT: Name: .opd
|
|
# CHECK-NEXT: Type: SHT_PROGBITS (0x1)
|
|
# CHECK-NEXT: Flags [ (0x3)
|
|
# CHECK-NEXT: SHF_ALLOC (0x2)
|
|
# CHECK-NEXT: SHF_WRITE (0x1)
|
|
# CHECK-NEXT: ]
|
|
# CHECK-NEXT: Address: 0x10020040
|
|
# CHECK-NEXT: Offset: 0x20040
|
|
# CHECK-NEXT: Size: 24
|
|
# CHECK-NEXT: Link: 0
|
|
# CHECK-NEXT: Info: 0
|
|
# CHECK-NEXT: AddressAlignment: 1
|
|
# CHECK-NEXT: EntrySize: 0
|
|
# CHECK-NEXT: SectionData (
|
|
# CHECK-NEXT: 0000: 00000000 10010000 00000000 00008000 |................|
|
|
# CHECK-NEXT: 0010: 00000000 00000000 |........|
|
|
# CHECK-NEXT: )
|
|
# CHECK-NEXT: }
|
|
# CHECK-NEXT: Section {
|
|
# CHECK-NEXT: Index: 5
|
|
# CHECK-NEXT: Name: .symtab
|
|
# CHECK-NEXT: Type: SHT_SYMTAB (0x2)
|
|
# CHECK-NEXT: Flags [ (0x0)
|
|
# CHECK-NEXT: ]
|
|
# CHECK-NEXT: Address: 0x0
|
|
# CHECK-NEXT: Offset: 0x20058
|
|
# CHECK-NEXT: Size: 48
|
|
# CHECK-NEXT: Link: 7
|
|
# CHECK-NEXT: Info: 1
|
|
# CHECK-NEXT: AddressAlignment: 8
|
|
# CHECK-NEXT: EntrySize: 24
|
|
# CHECK-NEXT: SectionData (
|
|
# CHECK: )
|
|
# CHECK-NEXT: }
|
|
# CHECK-NEXT: Section {
|
|
# CHECK-NEXT: Index: 6
|
|
# CHECK-NEXT: Name: .shstrtab
|
|
# CHECK-NEXT: Type: SHT_STRTAB (0x3)
|
|
# CHECK-NEXT: Flags [ (0x0)
|
|
# CHECK-NEXT: ]
|
|
# CHECK-NEXT: Address: 0x0
|
|
# CHECK-NEXT: Offset: 0x20088
|
|
# CHECK-NEXT: Size: 49
|
|
# CHECK-NEXT: Link: 0
|
|
# CHECK-NEXT: Info: 0
|
|
# CHECK-NEXT: AddressAlignment: 1
|
|
# CHECK-NEXT: EntrySize: 0
|
|
# CHECK-NEXT: SectionData (
|
|
# CHECK: )
|
|
# CHECK-NEXT: }
|
|
# CHECK-NEXT: Section {
|
|
# CHECK-NEXT: Index: 7
|
|
# CHECK-NEXT: Name: .strtab (41)
|
|
# CHECK-NEXT: Type: SHT_STRTAB (0x3)
|
|
# CHECK-NEXT: Flags [ (0x0)
|
|
# CHECK-NEXT: ]
|
|
# CHECK-NEXT: Address: 0x0
|
|
# CHECK-NEXT: Offset: 0x200B9
|
|
# CHECK-NEXT: Size: 8
|
|
# CHECK-NEXT: Link: 0
|
|
# CHECK-NEXT: Info: 0
|
|
# CHECK-NEXT: AddressAlignment: 1
|
|
# CHECK-NEXT: EntrySize: 0
|
|
# CHECK-NEXT: SectionData (
|
|
# CHECK-NEXT: 0000: 005F7374 61727400 |._start.|
|
|
# CHECK-NEXT: )
|
|
# CHECK-NEXT: }
|
|
# CHECK-NEXT: ]
|
|
# CHECK-NEXT: ProgramHeaders [
|
|
# CHECK-NEXT: ProgramHeader {
|
|
# CHECK-NEXT: Type: PT_PHDR (0x6)
|
|
# CHECK-NEXT: Offset: 0x40
|
|
# CHECK-NEXT: VirtualAddress: 0x10000040
|
|
# CHECK-NEXT: PhysicalAddress: 0x10000040
|
|
# CHECK-NEXT: FileSize: 280
|
|
# CHECK-NEXT: MemSize: 280
|
|
# CHECK-NEXT: Flags [ (0x4)
|
|
# CHECK-NEXT: PF_R (0x4)
|
|
# CHECK-NEXT: ]
|
|
# CHECK-NEXT: Alignment: 8
|
|
# CHECK-NEXT: }
|
|
# CHECK-NEXT: ProgramHeader {
|
|
# CHECK-NEXT: Type: PT_LOAD (0x1)
|
|
# CHECK-NEXT: Offset: 0x0
|
|
# CHECK-NEXT: VirtualAddress: 0x10000000
|
|
# CHECK-NEXT: PhysicalAddress: 0x10000000
|
|
# CHECK-NEXT: FileSize: 344
|
|
# CHECK-NEXT: MemSize: 344
|
|
# CHECK-NEXT: Flags [
|
|
# CHECK-NEXT: PF_R
|
|
# CHECK-NEXT: ]
|
|
# CHECK-NEXT: Alignment: 65536
|
|
# CHECK-NEXT: }
|
|
# CHECK-NEXT: ProgramHeader {
|
|
# CHECK-NEXT: Type: PT_LOAD (0x1)
|
|
# CHECK-NEXT: Offset: 0x10000
|
|
# CHECK-NEXT: VirtualAddress: 0x10010000
|
|
# CHECK-NEXT: PhysicalAddress: 0x10010000
|
|
# CHECK-NEXT: FileSize: 12
|
|
# CHECK-NEXT: MemSize: 12
|
|
# CHECK-NEXT: Flags [ (0x5)
|
|
# CHECK-NEXT: PF_R (0x4)
|
|
# CHECK-NEXT: PF_X (0x1)
|
|
# CHECK-NEXT: ]
|
|
# CHECK-NEXT: Alignment: 65536
|
|
# CHECK-NEXT: }
|
|
# CHECK-NEXT: ProgramHeader {
|
|
# CHECK-NEXT: Type: PT_LOAD (0x1)
|
|
# CHECK-NEXT: Offset: 0x20000
|
|
# CHECK-NEXT: VirtualAddress: 0x10020000
|
|
# CHECK-NEXT: PhysicalAddress: 0x10020000
|
|
# CHECK-NEXT: FileSize: 88
|
|
# CHECK-NEXT: MemSize: 88
|
|
# CHECK-NEXT: Flags [ (0x6)
|
|
# CHECK-NEXT: PF_R (0x4)
|
|
# CHECK-NEXT: PF_W (0x2)
|
|
# CHECK-NEXT: ]
|
|
# CHECK-NEXT: Alignment: 65536
|
|
# CHECK-NEXT: }
|
|
# CHECK-NEXT: ProgramHeader {
|
|
# CHECK-NEXT: Type: PT_GNU_STACK (0x6474E551)
|
|
# CHECK-NEXT: Offset: 0x0
|
|
# CHECK-NEXT: VirtualAddress: 0x0
|
|
# CHECK-NEXT: PhysicalAddress: 0x0
|
|
# CHECK-NEXT: FileSize: 0
|
|
# CHECK-NEXT: MemSize: 0
|
|
# CHECK-NEXT: Flags [ (0x6)
|
|
# CHECK-NEXT: PF_R (0x4)
|
|
# CHECK-NEXT: PF_W (0x2)
|
|
# CHECK-NEXT: ]
|
|
# CHECK-NEXT: Alignment: 0
|
|
# CHECK-NEXT: }
|
|
# CHECK-NEXT: ]
|