compression.s
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// REQUIRES: zlib
// Check zlib-gnu style
// RUN: llvm-mc -filetype=obj -compress-debug-sections=zlib-gnu -triple x86_64-pc-linux-gnu < %s -o %t
// RUN: llvm-objdump -s %t | FileCheck --check-prefix=CHECK-GNU-STYLE %s
// RUN: llvm-dwarfdump -debug-str %t | FileCheck --check-prefix=STR %s
// RUN: llvm-mc -filetype=obj -compress-debug-sections=zlib-gnu -triple i386-pc-linux-gnu < %s \
// RUN: | llvm-readobj --symbols - | FileCheck --check-prefix=386-SYMBOLS-GNU %s
// Check zlib style
// RUN: llvm-mc -filetype=obj -compress-debug-sections=zlib -triple x86_64-pc-linux-gnu < %s -o %t
// RUN: llvm-objdump -s %t | FileCheck --check-prefix=CHECK-ZLIB-STYLE %s
// RUN: llvm-dwarfdump -debug-str %t | FileCheck --check-prefix=STR %s
// RUN: llvm-readobj --sections %t | FileCheck --check-prefixes=ZLIB-STYLE-FLAGS,ZLIB-STYLE-FLAGS64 %s
// RUN: llvm-mc -filetype=obj -compress-debug-sections=zlib -triple i386-pc-linux-gnu < %s -o %t
// RUN: llvm-readobj --symbols -S %t \
// RUN: | FileCheck --check-prefixes=386-SYMBOLS-ZLIB,ZLIB-STYLE-FLAGS,ZLIB-STYLE-FLAGS32 %s
// Don't compress small sections, such as this simple debug_abbrev example
// CHECK-GNU-STYLE: Contents of section .debug_abbrev:
// CHECK-GNU-STYLE-NOT: ZLIB
// CHECK-GNU-STYLE-NOT: Contents of
// CHECK-GNU-STYLE: Contents of section .debug_info:
// CHECK-GNU-STYLE: Contents of section .zdebug_str:
// Check for the 'ZLIB' file magic at the start of the section only
// CHECK-GNU-STYLE-NEXT: ZLIB
// CHECK-GNU-STYLE-NOT: ZLIB
// FIXME: Handle compressing alignment fragments to support compressing debug_frame
// CHECK-GNU-STYLE: Contents of section .debug_frame:
// CHECK-GNU-STYLE-NOT: ZLIB
// CHECK-GNU-STYLE: Contents of
// Decompress one valid dwarf section just to check that this roundtrips,
// we use .zdebug_str section for that
// STR: perfectly compressable data sample *****************************************
// In x86 32 bit named symbols are used for temporary symbols in merge
// sections, so make sure we handle symbols inside compressed sections
// 386-SYMBOLS-GNU: Name: .Linfo_string0
// 386-SYMBOLS-GNU-NOT: }
// 386-SYMBOLS-GNU: Section: .zdebug_str
// Now check the zlib style output:
// Don't compress small sections, such as this simple debug_abbrev example
// CHECK-ZLIB-STYLE: Contents of section .debug_abbrev:
// CHECK-ZLIB-STYLE-NOT: ZLIB
// CHECK-ZLIB-STYLE-NOT: Contents of
// CHECK-ZLIB-STYLE: Contents of section .debug_info:
// FIXME: Handle compressing alignment fragments to support compressing debug_frame
// CHECK-ZLIB-STYLE: Contents of section .debug_frame:
// CHECK-ZLIB-STYLE-NOT: ZLIB
// CHECK-ZLIB-STYLE: Contents of
// Check that debug_line section was not renamed, so it is
// zlib-style, not zlib-gnu one. Check that SHF_COMPRESSED was set.
// ZLIB-STYLE-FLAGS: Section {
// ZLIB-STYLE-FLAGS: Index:
// ZLIB-STYLE-FLAGS: Name: .debug_str
// ZLIB-STYLE-FLAGS-NEXT: Type: SHT_PROGBITS
// ZLIB-STYLE-FLAGS-NEXT: Flags [
// ZLIB-STYLE-FLAGS-NEXT: SHF_COMPRESSED
// ZLIB-STYLE-FLAGS-NEXT: SHF_MERGE
// ZLIB-STYLE-FLAGS-NEXT: SHF_STRINGS
// ZLIB-STYLE-FLAGS-NEXT: ]
// ZLIB-STYLE-FLAGS-NEXT: Address:
// ZLIB-STYLE-FLAGS-NEXT: Offset:
// ZLIB-STYLE-FLAGS-NEXT: Size:
// ZLIB-STYLE-FLAGS-NEXT: Link:
// ZLIB-STYLE-FLAGS-NEXT: Info:
// ZLIB-STYLE-FLAGS32-NEXT: AddressAlignment: 4
// ZLIB-STYLE-FLAGS64-NEXT: AddressAlignment: 8
// 386-SYMBOLS-ZLIB: Name: .Linfo_string0
// 386-SYMBOLS-ZLIB-NOT: }
// 386-SYMBOLS-ZLIB: Section: .debug_str
.section .debug_line,"",@progbits
.section .debug_abbrev,"",@progbits
.Lsection_abbrev:
.byte 1 # Abbreviation Code
.byte 17 # DW_TAG_compile_unit
.byte 0 # DW_CHILDREN_no
.byte 27 # DW_AT_comp_dir
.byte 14 # DW_FORM_strp
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.section .debug_info,"",@progbits
.long 12 # Length of Unit
.short 4 # DWARF version number
.long .Lsection_abbrev # Offset Into Abbrev. Section
.byte 8 # Address Size (in bytes)
.byte 1 # Abbrev [1] DW_TAG_compile_unit
.long .Linfo_string0 # DW_AT_comp_dir
.text
foo:
.cfi_startproc
.file 1 "Driver.ii"
# pad out the line table to make sure it's big enough to warrant compression
.loc 1 2 0
nop
.loc 1 3 0
nop
.loc 1 4 0
nop
.loc 1 5 0
nop
.loc 1 6 0
nop
.loc 1 7 0
nop
.loc 1 8 0
nop
.cfi_endproc
.cfi_sections .debug_frame
# Below is the section we will use to check that after compression with llvm-mc,
# llvm-dwarfdump tool will be able to decompress data back and dump it. Data sample
# should be compressable enough, so it is filled with some amount of equal symbols at the end
.section .debug_str,"MS",@progbits,1
.Linfo_string0:
.asciz "perfectly compressable data sample *****************************************"