[Development] Disabling exception support in QtCore?
Thiago Macieira
thiago.macieira at intel.com
Wed Oct 2 00:30:15 CEST 2013
On terça-feira, 1 de outubro de 2013 22:28:53, André Pönitz wrote:
> Perhaps... do we have numbers how much the gain would actually be, say,
> for code size?
All numbers are based on my own QtCore tree, which contains a lot of patches
on top of current stable, including protected visibility. I will not test the
pristine tree.
All builds are in release mode and the libraries have been stripped of
debugging symbols (strip --strip-debug --strip-unneeded). The non-standard
flags used were:
GCC 4.7.2: -march=corei7-avx -std=c++0x -O3 -maccumulate-outgoing-args -flto
GCC 4.8:.2 (same)
ICC 14.0: -march=corei7-avx -O3 -std=c++0x
Clang 3.3: -march=corei7-avx -O3 -std=c++11
Linker flags (all compilers): -Wl,-O1 -Wl,-z,relro -Wl,--as-needed
The -O3 flag is enables optimisations that increase code size, which means this
is probably skewed. It's highly unlikely that the exceptional codepath
increases in size as much as the regular code path, though.
Findings:
- the .gcc_except_table section disappears
- the .eh_frame and .eh_frame_hdr sections remain present, with negligible
shrinkage for .eh_frame_hdr (except for ICC)
- the size of the .text section shrinks by 5.7%
- the size of the read-execute ELF segment reduces by 6.5% (same as reported
by the /usr/bin/size tool)
- the overall file size also reduces by 6.5%, which is expected since the read-
only portion of QtCore is roughly 99% of the file size. (interestingly, the
actual .text segment is only 57%)
--
Thiago Macieira - thiago.macieira (AT) intel.com
Software Architect - Intel Open Source Technology Center
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except-clang:
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Section Headers:
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Segment Sections...
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Section Headers:
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PHDR 0x000040 0x0000000000000040 0x0000000000000040 0x0001f8 0x0001f8 R 0x8
INTERP 0x402670 0x0000000000402670 0x0000000000402670 0x00001c 0x00001c R 0x10
[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]
LOAD 0x000000 0x0000000000000000 0x0000000000000000 0x450fe0 0x450fe0 R E 0x1000
LOAD 0x4518a0 0x00000000004528a0 0x00000000004528a0 0x00b670 0x00cf10 RW 0x1000
DYNAMIC 0x45bba8 0x000000000045cba8 0x000000000045cba8 0x0002a0 0x0002a0 RW 0x8
GNU_EH_FRAME 0x442844 0x0000000000442844 0x0000000000442844 0x00e79c 0x00e79c R 0x4
GNU_STACK 0x000000 0x0000000000000000 0x0000000000000000 0x000000 0x000000 RW 0x0
TLS 0x4518a0 0x00000000004528a0 0x00000000004528a0 0x000000 0x000008 R 0x8
GNU_RELRO 0x4518a0 0x00000000004528a0 0x00000000004528a0 0x00a760 0x00a760 R 0x1
Section to Segment mapping:
Segment Sections...
00
01 [RO: .interp]
02 [RO: .dynsym .dynstr .hash .gnu.version .gnu.version_d .gnu.version_r .rela.dyn .rela.plt .init .plt .text .fini .rodata .interp .eh_frame .eh_frame_hdr]
03 [RELRO: .tbss .data.rel.ro.local .jcr .data.rel.ro .dynamic .got] <RELRO: .got.plt> .data .fini_array .init_array .bss
04 [RELRO: .dynamic]
05 [RO: .eh_frame_hdr]
06
07 [RELRO: .tbss]
08 [RELRO: .tbss .data.rel.ro.local .jcr .data.rel.ro .dynamic .got]
noexcept-gcc47:
There are 32 section headers, starting at offset 0x4a00c0:
Section Headers:
[Nr] Name Type Addr Off Size ES Flags Lk Inf Al
[ 0] NULL 0000000000000000 00000000 00000000 0 0 0 0
[ 1] .note.gnu.build-id NOTE 0000000000000238 00000238 00000024 0 A 0 0 4
[ 2] .dynsym DYNSYM 0000000000000260 00000260 00020da8 24 A 3 1 8
[ 3] .dynstr STRTAB 0000000000021008 00021008 000325f6 0 A 0 0 1
[ 4] .gnu.hash GNU_HASH 0000000000053600 00053600 0000a348 0 A 2 0 8
[ 5] .gnu.version GNU_versym 000000000005d948 0005d948 00002bce 2 A 2 0 2
[ 6] .gnu.version_d GNU_verdef 0000000000060518 00060518 0000001c 0 A 3 1 4
[ 7] .gnu.version_r GNU_verneed 0000000000060534 00060534 00000140 0 A 3 6 4
[ 8] .rela.dyn RELA 0000000000060678 00060678 00014d30 24 A 2 0 8
[ 9] .rela.plt RELA 00000000000753a8 000753a8 000018a8 24 A 2 11 8
[10] .init PROGBITS 0000000000076c50 00076c50 0000000e 0 AX 0 0 4
[11] .plt PROGBITS 0000000000076c60 00076c60 00001080 16 AX 0 0 16
[12] .text PROGBITS 0000000000077ce0 00077ce0 0029c1a8 0 AX 0 0 16
[13] .fini PROGBITS 0000000000313e88 00313e88 00000009 0 AX 0 0 4
[14] .rodata PROGBITS 0000000000313ea0 00313ea0 00110843 0 A 0 0 32
[15] .eh_frame PROGBITS 00000000004246e8 004246e8 0005c7b8 0 A 0 0 8
[16] .eh_frame_hdr PROGBITS 0000000000480ea0 00480ea0 000141f4 0 A 0 0 4
[17] .tbss NOBITS 0000000000496e20 00495e20 00000008 0 WAT 0 0 8
[18] .data.rel.ro.local PROGBITS 0000000000496e20 00495e20 00000bb0 0 WA 0 0 32
[19] .jcr PROGBITS 00000000004979d0 004969d0 00000008 0 WA 0 0 8
[20] .data.rel.ro PROGBITS 00000000004979e0 004969e0 000082e8 0 WA 0 0 32
[21] .dynamic DYNAMIC 000000000049fcc8 0049ecc8 000002a0 16 WA 3 0 8
[22] .got PROGBITS 000000000049ff70 0049ef70 00000078 0 WA 0 0 8
[23] .got.plt PROGBITS 000000000049ffe8 0049efe8 00000850 0 WA 0 0 8
[24] .data PROGBITS 00000000004a0840 0049f840 000006d0 0 WA 0 0 32
[25] .tm_clone_table PROGBITS 00000000004a0f10 0049ff10 00000000 0 WA 0 0 8
[26] .fini_array FINI_ARRAY 00000000004a0f10 0049ff10 00000010 0 WA 0 0 8
[27] .init_array INIT_ARRAY 00000000004a0f20 0049ff20 00000010 0 WA 0 0 8
[28] .bss NOBITS 00000000004a0f40 0049ff30 00002788 0 WA 0 0 32
[29] .comment PROGBITS 0000000000000000 0049ff30 0000002d 1 MS 0 0 1
[30] .note.gnu.gold-version NOTE 0000000000000000 0049ff60 0000001c 0 0 0 4
[31] .shstrtab STRTAB 0000000000000000 0049ff7c 0000013e 0 0 0 1
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
PHDR 0x000040 0x0000000000000040 0x0000000000000040 0x0001f8 0x0001f8 R 0x8
LOAD 0x000000 0x0000000000000000 0x0000000000000000 0x495094 0x495094 R E 0x1000
LOAD 0x495e20 0x0000000000496e20 0x0000000000496e20 0x00a110 0x00c8a8 RW 0x1000
DYNAMIC 0x49ecc8 0x000000000049fcc8 0x000000000049fcc8 0x0002a0 0x0002a0 RW 0x8
NOTE 0x000238 0x0000000000000238 0x0000000000000238 0x000024 0x000024 R 0x4
GNU_EH_FRAME 0x480ea0 0x0000000000480ea0 0x0000000000480ea0 0x0141f4 0x0141f4 R 0x4
GNU_STACK 0x000000 0x0000000000000000 0x0000000000000000 0x000000 0x000000 RW 0x0
TLS 0x495e20 0x0000000000496e20 0x0000000000496e20 0x000000 0x000008 R 0x8
GNU_RELRO 0x495e20 0x0000000000496e20 0x0000000000496e20 0x0091e0 0x0091e0 R 0x1
Section to Segment mapping:
Segment Sections...
00
01 [RO: .note.gnu.build-id .dynsym .dynstr .gnu.hash .gnu.version .gnu.version_d .gnu.version_r .rela.dyn .rela.plt .init .plt .text .fini .rodata .eh_frame .eh_frame_hdr]
02 [RELRO: .tbss .data.rel.ro.local .jcr .data.rel.ro .dynamic .got] <RELRO: .got.plt> .data .fini_array .init_array .bss
03 [RELRO: .dynamic]
04 [RO: .note.gnu.build-id]
05 [RO: .eh_frame_hdr]
06
07 [RELRO: .tbss]
08 [RELRO: .tbss .data.rel.ro.local .jcr .data.rel.ro .dynamic .got]
noexcept-gcc48:
There are 32 section headers, starting at offset 0x46d138:
Section Headers:
[Nr] Name Type Addr Off Size ES Flags Lk Inf Al
[ 0] NULL 0000000000000000 00000000 00000000 0 0 0 0
[ 1] .note.gnu.build-id NOTE 0000000000000238 00000238 00000024 0 A 0 0 4
[ 2] .dynsym DYNSYM 0000000000000260 00000260 00020da8 24 A 3 1 8
[ 3] .dynstr STRTAB 0000000000021008 00021008 000325f6 0 A 0 0 1
[ 4] .gnu.hash GNU_HASH 0000000000053600 00053600 0000a348 0 A 2 0 8
[ 5] .gnu.version GNU_versym 000000000005d948 0005d948 00002bce 2 A 2 0 2
[ 6] .gnu.version_d GNU_verdef 0000000000060518 00060518 0000001c 0 A 3 1 4
[ 7] .gnu.version_r GNU_verneed 0000000000060534 00060534 00000140 0 A 3 6 4
[ 8] .rela.dyn RELA 0000000000060678 00060678 00014d30 24 A 2 0 8
[ 9] .rela.plt RELA 00000000000753a8 000753a8 000018a8 24 A 2 11 8
[10] .init PROGBITS 0000000000076c50 00076c50 0000000e 0 AX 0 0 4
[11] .plt PROGBITS 0000000000076c60 00076c60 00001080 16 AX 0 0 16
[12] .text PROGBITS 0000000000077ce0 00077ce0 00283468 0 AX 0 0 16
[13] .fini PROGBITS 00000000002fb148 002fb148 00000009 0 AX 0 0 4
[14] .rodata PROGBITS 00000000002fb160 002fb160 001104b1 0 A 0 0 32
[15] .eh_frame PROGBITS 000000000040b618 0040b618 00049fa8 0 A 0 0 8
[16] .eh_frame_hdr PROGBITS 00000000004555c0 004555c0 0000d7cc 0 A 0 0 4
[17] .tbss NOBITS 0000000000463dc0 00462dc0 00000008 0 WAT 0 0 32
[18] .data.rel.ro.local PROGBITS 0000000000463dc0 00462dc0 00000bc8 0 WA 0 0 32
[19] .jcr PROGBITS 0000000000464988 00463988 00000008 0 WA 0 0 8
[20] .data.rel.ro PROGBITS 00000000004649a0 004639a0 00008330 0 WA 0 0 32
[21] .dynamic DYNAMIC 000000000046ccd0 0046bcd0 000002a0 16 WA 3 0 8
[22] .got PROGBITS 000000000046cf70 0046bf70 00000078 0 WA 0 0 8
[23] .got.plt PROGBITS 000000000046cfe8 0046bfe8 00000850 0 WA 0 0 8
[24] .data PROGBITS 000000000046d840 0046c840 00000724 0 WA 0 0 32
[25] .tm_clone_table PROGBITS 000000000046df68 0046cf68 00000000 0 WA 0 0 8
[26] .fini_array FINI_ARRAY 000000000046df68 0046cf68 00000010 0 WA 0 0 8
[27] .init_array INIT_ARRAY 000000000046df78 0046cf78 00000010 0 WA 0 0 8
[28] .bss NOBITS 000000000046dfa0 0046cf88 00002a74 0 WA 0 0 32
[29] .comment PROGBITS 0000000000000000 0046cf88 00000054 1 MS 0 0 1
[30] .note.gnu.gold-version NOTE 0000000000000000 0046cfdc 0000001c 0 0 0 4
[31] .shstrtab STRTAB 0000000000000000 0046cff8 0000013e 0 0 0 1
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
PHDR 0x000040 0x0000000000000040 0x0000000000000040 0x0001f8 0x0001f8 R 0x8
LOAD 0x000000 0x0000000000000000 0x0000000000000000 0x462d8c 0x462d8c R E 0x1000
LOAD 0x462dc0 0x0000000000463dc0 0x0000000000463dc0 0x00a1c8 0x00cc54 RW 0x1000
DYNAMIC 0x46bcd0 0x000000000046ccd0 0x000000000046ccd0 0x0002a0 0x0002a0 RW 0x8
NOTE 0x000238 0x0000000000000238 0x0000000000000238 0x000024 0x000024 R 0x4
GNU_EH_FRAME 0x4555c0 0x00000000004555c0 0x00000000004555c0 0x00d7cc 0x00d7cc R 0x4
GNU_STACK 0x000000 0x0000000000000000 0x0000000000000000 0x000000 0x000000 RW 0x0
TLS 0x462dc0 0x0000000000463dc0 0x0000000000463dc0 0x000000 0x000008 R 0x20
GNU_RELRO 0x462dc0 0x0000000000463dc0 0x0000000000463dc0 0x009240 0x009240 R 0x1
Section to Segment mapping:
Segment Sections...
00
01 [RO: .note.gnu.build-id .dynsym .dynstr .gnu.hash .gnu.version .gnu.version_d .gnu.version_r .rela.dyn .rela.plt .init .plt .text .fini .rodata .eh_frame .eh_frame_hdr]
02 [RELRO: .tbss .data.rel.ro.local .jcr .data.rel.ro .dynamic .got] <RELRO: .got.plt> .data .fini_array .init_array .bss
03 [RELRO: .dynamic]
04 [RO: .note.gnu.build-id]
05 [RO: .eh_frame_hdr]
06
07 [RELRO: .tbss]
08 [RELRO: .tbss .data.rel.ro.local .jcr .data.rel.ro .dynamic .got]
noexcept-icc:
There are 34 section headers, starting at offset 0x752128:
Section Headers:
[Nr] Name Type Addr Off Size ES Flags Lk Inf Al
[ 0] NULL 0000000000000000 00000000 00000000 0 0 0 0
[ 1] .note.gnu.build-id NOTE 0000000000000270 00000270 00000024 0 A 0 0 4
[ 2] .dynsym DYNSYM 0000000000000298 00000298 000246d8 24 A 3 2 8
[ 3] .dynstr STRTAB 0000000000024970 00024970 0003942a 0 A 0 0 1
[ 4] .hash HASH 000000000005dda0 0005dda0 0000a138 4 A 2 0 8
[ 5] .gnu.version GNU_versym 0000000000067ed8 00067ed8 00003092 2 A 2 0 2
[ 6] .gnu.version_d GNU_verdef 000000000006af6c 0006af6c 0000001c 0 A 3 1 4
[ 7] .gnu.version_r GNU_verneed 000000000006af88 0006af88 00000130 0 A 3 6 4
[ 8] .rela.dyn RELA 000000000006b0b8 0006b0b8 000262f8 24 A 2 0 8
[ 9] .rela.plt RELA 00000000000913b0 000913b0 00001890 24 A 2 11 8
[10] .init PROGBITS 0000000000092c40 00092c40 0000000e 0 AX 0 0 4
[11] .plt PROGBITS 0000000000092c50 00092c50 00001070 16 AX 0 0 16
[12] .text PROGBITS 0000000000093cc0 00093cc0 0049fb80 0 AX 0 0 16
[13] .fini PROGBITS 0000000000533840 00533840 00000009 0 AX 0 0 4
[14] .rodata PROGBITS 0000000000533860 00533860 00109200 0 A 0 0 32
[15] .interp PROGBITS 000000000063ca60 0063ca60 0000001c 0 A 0 0 4
[16] .eh_frame PROGBITS 000000000063ca80 0063ca80 000efb9c 0 A 0 0 8
[17] .eh_frame_hdr PROGBITS 000000000072c61c 0072c61c 0000f6b4 0 A 0 0 4
[18] .tbss NOBITS 000000000073ce80 0073be80 00000008 0 WAT 0 0 8
[19] .data.rel.ro.local PROGBITS 000000000073ce80 0073be80 00008b80 0 WA 0 0 32
[20] .jcr PROGBITS 0000000000745a00 00744a00 00000008 0 WA 0 0 8
[21] .data.rel.ro PROGBITS 0000000000745a20 00744a20 00001c60 0 WA 0 0 32
[22] .dynamic DYNAMIC 0000000000747680 00746680 000002d0 16 WA 3 0 8
[23] .got PROGBITS 0000000000747968 00746968 00000680 0 WA 0 0 8
[24] .got.plt PROGBITS 0000000000747fe8 00746fe8 00000848 0 WA 0 0 8
[25] .data PROGBITS 0000000000748840 00747840 00008e8c 0 WA 0 0 32
[26] .tm_clone_table PROGBITS 00000000007516d0 007506d0 00000000 0 WA 0 0 8
[27] .fini_array FINI_ARRAY 00000000007516d0 007506d0 00000010 0 WA 0 0 8
[28] .init_array INIT_ARRAY 00000000007516e0 007506e0 00000048 0 WA 0 0 8
[29] .bss NOBITS 0000000000751740 00750728 00001070 0 WA 0 0 32
[30] .data NOBITS 00000000007527c0 00750728 00000ba8 0 WA 0 0 32
[31] .comment PROGBITS 0000000000000000 00750728 0000189d 0 0 0 1
[32] .note.gnu.gold-version NOTE 0000000000000000 00751fc8 0000001c 0 0 0 4
[33] .shstrtab STRTAB 0000000000000000 00751fe4 00000142 0 0 0 1
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
PHDR 0x000040 0x0000000000000040 0x0000000000000040 0x000230 0x000230 R 0x8
INTERP 0x63ca60 0x000000000063ca60 0x000000000063ca60 0x00001c 0x00001c R 0x4
[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]
LOAD 0x000000 0x0000000000000000 0x0000000000000000 0x73bcd0 0x73bcd0 R E 0x1000
LOAD 0x73be80 0x000000000073ce80 0x000000000073ce80 0x0148a8 0x0164e8 RW 0x1000
DYNAMIC 0x746680 0x0000000000747680 0x0000000000747680 0x0002d0 0x0002d0 RW 0x8
NOTE 0x000270 0x0000000000000270 0x0000000000000270 0x000024 0x000024 R 0x4
GNU_EH_FRAME 0x72c61c 0x000000000072c61c 0x000000000072c61c 0x00f6b4 0x00f6b4 R 0x4
GNU_STACK 0x000000 0x0000000000000000 0x0000000000000000 0x000000 0x000000 RW 0x0
TLS 0x73be80 0x000000000073ce80 0x000000000073ce80 0x000000 0x000008 R 0x8
GNU_RELRO 0x73be80 0x000000000073ce80 0x000000000073ce80 0x00b180 0x00b180 R 0x1
Section to Segment mapping:
Segment Sections...
00
01 [RO: .interp]
02 [RO: .note.gnu.build-id .dynsym .dynstr .hash .gnu.version .gnu.version_d .gnu.version_r .rela.dyn .rela.plt .init .plt .text .fini .rodata .interp .eh_frame .eh_frame_hdr]
03 [RELRO: .tbss .data.rel.ro.local .jcr .data.rel.ro .dynamic .got] <RELRO: .got.plt> .data .fini_array .init_array .bss .data
04 [RELRO: .dynamic]
05 [RO: .note.gnu.build-id]
06 [RO: .eh_frame_hdr]
07
08 [RELRO: .tbss]
09 [RELRO: .tbss .data.rel.ro.local .jcr .data.rel.ro .dynamic .got]
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