ce2ae38124
ld64 breaks down `__objc_classrefs` on a per-word level and deduplicates them. This greatly reduces the number of bind entries emitted (and therefore the amount of work `dyld` has to do at runtime). For chromium_framework, this change to LLD cuts the number of (non-lazy) binds from 912 to 190, getting us to parity with ld64 in this aspect. Reviewed By: #lld-macho, thakis Differential Revision: https://reviews.llvm.org/D121053
54 lines
1.5 KiB
ArmAsm
54 lines
1.5 KiB
ArmAsm
# REQUIRES: x86
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# RUN: rm -rf %t; split-file %s %t
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# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/defs.s -o %t/defs.o
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# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/refs1.s -o %t/refs1.o
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# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/refs2.s -o %t/refs2.o
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# RUN: %lld -lSystem -dylib %t/defs.o -o %t/libdefs.dylib
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# RUN: %lld -lSystem -dylib --icf=all %t/refs1.o %t/refs2.o %t/libdefs.dylib -o %t/out
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# RUN: llvm-objdump --macho --section-headers --bind %t/out | FileCheck %s \
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# RUN: --implicit-check-not __objc_classrefs
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## Check that we only have 3 (unique) entries
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# CHECK: Sections:
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# CHECK-NEXT: Idx Name Size
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# CHECK: __objc_classrefs 00000018
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## And only two binds
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# CHECK: Bind table:
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# CHECK-NEXT: segment section address type addend dylib symbol
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# CHECK-DAG: __DATA __objc_classrefs {{.*}} pointer 0 libdefs _OBJC_CLASS_$_Bar
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# CHECK-DAG: __DATA __objc_classrefs {{.*}} pointer 0 libdefs _OBJC_CLASS_$_Foo
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#--- defs.s
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.globl _OBJC_CLASS_$_Foo, _OBJC_CLASS_$_Bar
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.section __DATA,__objc_data
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_OBJC_CLASS_$_Foo:
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.quad 123
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_OBJC_CLASS_$_Bar:
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.quad 456
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.subsections_via_symbols
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#--- refs1.s
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.globl _OBJC_CLASS_$_Baz
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.section __DATA,__objc_data
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_OBJC_CLASS_$_Baz:
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.quad 789
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.section __DATA,__objc_classrefs
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.quad _OBJC_CLASS_$_Foo
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.quad _OBJC_CLASS_$_Bar
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.quad _OBJC_CLASS_$_Baz
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.quad _OBJC_CLASS_$_Baz
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.subsections_via_symbols
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#--- refs2.s
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.section __DATA,__objc_classrefs
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.quad _OBJC_CLASS_$_Foo
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.quad _OBJC_CLASS_$_Bar
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.subsections_via_symbols
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