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2e3463ec43
Both ZLIB and the debug info compressed section header ("ZLIB" + the
size of the uncompressed data) take some constant overhead so in some
cases the compressed data is actually larger than the uncompressed data.
In these cases, just don't compress or rename the section at all.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206659 91177308-0d34-0410-b5e6-96231b3b80d8
81 lines
2.6 KiB
ArmAsm
81 lines
2.6 KiB
ArmAsm
// RUN: llvm-mc -filetype=obj -compress-debug-sections -triple x86_64-pc-linux-gnu < %s -o %t
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// RUN: llvm-objdump -s %t | FileCheck %s
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// RUN: llvm-dwarfdump -debug-dump=info %t | FileCheck --check-prefix=INFO %s
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// RUN: llvm-mc -filetype=obj -compress-debug-sections -triple i386-pc-linux-gnu < %s \
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// RUN: | llvm-readobj -symbols - | FileCheck --check-prefix=386-SYMBOLS %s
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// REQUIRES: zlib
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// CHECK: Contents of section .zdebug_line:
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// Check for the 'ZLIB' file magic at the start of the section only
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// CHECK-NEXT: ZLIB
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// CHECK-NOT: ZLIB
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// CHECK: Contents of
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// Don't compress small sections, such as this simple debug_abbrev example
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// CHECK: Contents of section .debug_abbrev:
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// CHECK-NOT: ZLIB
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// CHECK-NOT: Contents of
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// CHECK: Contents of section .debug_info:
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// FIXME: Handle compressing alignment fragments to support compressing debug_frame
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// CHECK: Contents of section .debug_frame:
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// CHECK-NOT: ZLIB
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// CHECK: Contents of
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// Decompress one valid dwarf section just to check that this roundtrips
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// INFO: 0x00000000: Compile Unit: length = 0x0000000c version = 0x0004 abbr_offset = 0x0000 addr_size = 0x08 (next unit at 0x00000010)
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// In x86 32 bit named symbols are used for temporary symbols in merge
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// sections, so make sure we handle symbols inside compressed sections
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// 386-SYMBOLS: Name: .Linfo_string0
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// 386-SYMBOLS-NOT: }
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// 386-SYMBOLS: Section: .zdebug_str
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.section .debug_line,"",@progbits
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.section .debug_abbrev,"",@progbits
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.Lsection_abbrev:
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.byte 1 # Abbreviation Code
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.byte 17 # DW_TAG_compile_unit
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.byte 0 # DW_CHILDREN_no
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.byte 27 # DW_AT_comp_dir
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.byte 14 # DW_FORM_strp
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.byte 0 # EOM(1)
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.byte 0 # EOM(2)
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.section .debug_info,"",@progbits
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.long 12 # Length of Unit
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.short 4 # DWARF version number
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.long .Lsection_abbrev # Offset Into Abbrev. Section
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.byte 8 # Address Size (in bytes)
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.byte 1 # Abbrev [1] DW_TAG_compile_unit
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.long .Linfo_string0 # DW_AT_comp_dir
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.text
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foo:
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.cfi_startproc
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.file 1 "Driver.ii"
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# pad out the line table to make sure it's big enough to warrant compression
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.loc 1 2 0
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nop
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.loc 1 3 0
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nop
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.loc 1 4 0
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nop
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.loc 1 5 0
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nop
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.loc 1 6 0
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nop
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.loc 1 7 0
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nop
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.loc 1 8 0
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nop
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.cfi_endproc
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.cfi_sections .debug_frame
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.section .debug_str,"MS",@progbits,1
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.Linfo_string0:
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.asciz "compress this "
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