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dcf59c5480
With compilation fix.
Original commit message:
D39788 added a '.stack-size' section containing metadata on function stack sizes
to output ELF files behind the new -stack-size-section flag.
This change does following two things on top:
1) Imagine the case when there are -ffunction-sections flag given and there are text sections in COMDATs.
The patch adds a '.stack-size' section into corresponding COMDAT group, so that linker will be able to
eliminate them fast during resolving the COMDATs.
2) Patch sets a SHF_LINK_ORDER flag and links '.stack-size' with the corresponding .text.
With that linker will be able to do -gc-sections on dead stack sizes sections.
Differential revision: https://reviews.llvm.org/D46874
llvm-svn: 335336
27 lines
986 B
LLVM
27 lines
986 B
LLVM
; RUN: llc < %s -mtriple=x86_64-linux -stack-size-section -function-sections | FileCheck %s
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; Check we add SHF_LINK_ORDER for .stack_sizes and link it with the corresponding .text sections.
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; CHECK: .section .text._Z3barv,"ax",@progbits
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; CHECK: .section .stack_sizes,"o",@progbits,.text._Z3barv,unique,0
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; CHECK: .section .text._Z3foov,"ax",@progbits
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; CHECK: .section .stack_sizes,"o",@progbits,.text._Z3foov,unique,1
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; Check we add .stack_size section to a COMDAT group with the corresponding .text section if such a COMDAT exists.
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; CHECK: .section .text._Z4fooTIiET_v,"axG",@progbits,_Z4fooTIiET_v,comdat
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; CHECK: .section .stack_sizes,"Go",@progbits,_Z4fooTIiET_v,comdat,.text._Z4fooTIiET_v,unique,2
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$_Z4fooTIiET_v = comdat any
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define dso_local i32 @_Z3barv() {
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ret i32 0
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}
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define dso_local i32 @_Z3foov() {
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%1 = call i32 @_Z4fooTIiET_v()
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ret i32 %1
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}
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define linkonce_odr dso_local i32 @_Z4fooTIiET_v() comdat {
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ret i32 0
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}
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