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d23004c21c
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
33 lines
776 B
LLVM
33 lines
776 B
LLVM
; RUN: llc < %s -mtriple=armv7-linux -stack-size-section | FileCheck %s
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; CHECK-LABEL: func1:
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; CHECK-NEXT: .Lfunc_begin0:
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; CHECK: .section .stack_sizes,"o",%progbits,.text,unique,0
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; CHECK-NEXT: .long .Lfunc_begin0
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; CHECK-NEXT: .byte 8
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define void @func1(i32, i32) #0 {
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alloca i32, align 4
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alloca i32, align 4
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ret void
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}
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; CHECK-LABEL: func2:
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; CHECK-NEXT: .Lfunc_begin1:
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; CHECK: .section .stack_sizes,"o",%progbits,.text,unique,0
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; CHECK-NEXT: .long .Lfunc_begin1
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; CHECK-NEXT: .byte 16
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define void @func2() #0 {
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alloca i32, align 4
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call void @func1(i32 1, i32 2)
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ret void
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}
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; CHECK-LABEL: dynalloc:
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; CHECK-NOT: .section .stack_sizes
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define void @dynalloc(i32 %N) #0 {
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alloca i32, i32 %N
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ret void
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}
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attributes #0 = { "no-frame-pointer-elim"="true" }
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