forked from OSchip/llvm-project
91 lines
4.4 KiB
LLVM
91 lines
4.4 KiB
LLVM
; REQUIRES: x86
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;; NOTE: We deviate significantly from ld64's behavior here. We treat common
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;; bitcode symbols like regular common symbols, but ld64 gives them different
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;; (and IMO very strange) precedence. This test documents the differences.
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; RUN: rm -rf %t; split-file %s %t
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; RUN: opt -module-summary %t/test.ll -o %t/test.o
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; RUN: opt -module-summary %t/same-size.ll -o %t/same-size.o
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; RUN: opt -module-summary %t/smaller-size.ll -o %t/smaller-size.o
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; RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/same-size.s -o %t/same-size-asm.o
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; RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/smaller-size.s -o %t/smaller-size-asm.o
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;; ld64: Common bitcode symbols all have equal precedence, regardless of size or
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;; alignment.
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;; lld: We pick the symbol with the larger size, regardless of alignment.
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; RUN: %lld -dylib %t/test.o %t/smaller-size.o -order_file %t/order -o %t/test
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; RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#SIZE=2 -D#ALIGN=8
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; RUN: %lld -dylib %t/smaller-size.o %t/test.o -order_file %t/order -o %t/test
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; RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#SIZE=2 -D#ALIGN=8
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; COM (ld64): llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#SIZE=1 -D#ALIGN=16
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;; ld64: Common bitcode symbols all have equal precedence, regardless of size or
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;; alignment.
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;; lld: When the sizes are equal, we pick the symbol whose file occurs later in
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;; the command-line argument list.
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; RUN: %lld -dylib %t/test.o %t/same-size.o -order_file %t/order -o %t/test
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; RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#SIZE=2 -D#ALIGN=16
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; COM (ld64): llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#SIZE=2 -D#ALIGN=8
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; RUN: %lld -dylib %t/same-size.o %t/test.o -order_file %t/order -o %t/test
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; RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#SIZE=2 -D#ALIGN=8
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;; ld64: Non-bitcode common symbols take precedence.
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;; lld: We pick the symbol with the larger size, regardless of alignment.
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; RUN: %lld -dylib %t/test.o %t/smaller-size-asm.o -order_file %t/order -o %t/test
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; RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#SIZE=2 -D#ALIGN=8
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; COM (ld64): llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#SIZE=1 -D#ALIGN=16
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; RUN: %lld -dylib %t/smaller-size-asm.o %t/test.o -order_file %t/order -o %t/test
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; RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#SIZE=2 -D#ALIGN=8
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; COM (ld64): llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#SIZE=1 -D#ALIGN=16
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; RUN: %lld -dylib %t/test.o %t/same-size-asm.o -order_file %t/order -o %t/test
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; RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#SIZE=2 -D#ALIGN=16
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; RUN: %lld -dylib %t/same-size-asm.o %t/test.o -order_file %t/order -o %t/test
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; RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#SIZE=2 -D#ALIGN=8
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; COM (ld64): llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#SIZE=2 -D#ALIGN=16
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; CHECK-LABEL: Sections:
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; CHECK: __common {{[0-9a-f]+}} [[#%x, COMMON_START:]] BSS
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;
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; CHECK-LABEL: SYMBOL TABLE:
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; CHECK-DAG: [[#%.16x, COMMON_START]] g O __DATA,__common _check_size
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; CHECK-DAG: [[#%.16x, COMMON_START + SIZE]] g O __DATA,__common _end_marker
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; CHECK-DAG: [[#%.16x, COMMON_START + ALIGN]] g O __DATA,__common _check_alignment
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;--- order
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;; Order is important as we determine the size of a given symbol via the
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;; address of the next symbol.
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_check_size
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_end_marker
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_check_alignment
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;--- smaller-size.ll
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target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.15.0"
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@check_size = common global i8 0, align 1
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@check_alignment = common global i8 0, align 16
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;--- same-size.ll
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target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.15.0"
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@check_size = common global i16 0, align 1
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@check_alignment = common global i16 0, align 16
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;--- smaller-size.s
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.comm _check_size, 1, 1
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.comm _check_alignment, 1, 4
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;--- same-size.s
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.comm _check_size, 2, 1
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.comm _check_alignment, 2, 4
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;--- test.ll
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target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.15.0"
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@check_size = common global i16 0, align 1
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@end_marker = common global i8 0
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@check_alignment = common global i16 0, align 8
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