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Debug info: On ARM ensure that all __TEXT sections come before the

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optional DWARF sections, so compiling with -g does not result in
different code being generated for PC-relative loads.

This is reapplying a diet r197922 (__TEXT-only).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199681 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adrian Prantl 2014-01-20 19:15:59 +00:00
parent 6e08a410aa
commit 16d00e4b64
2 changed files with 25 additions and 0 deletions
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7
lib/Target/ARM/ARMAsmPrinter.cpp
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@ -489,6 +489,13 @@ void ARMAsmPrinter::EmitStartOfAsmFile(Module &M) {
SectionKind::getText()); SectionKind::getText());
OutStreamer.SwitchSection(StaticInitSect); OutStreamer.SwitchSection(StaticInitSect);
} }
// Compiling with debug info should not affect the code
// generation. Ensure the cstring section comes before the
// optional __DWARF secion. Otherwise, PC-relative loads would
// have to use different instruction sequences at "-g" in order to
// reach global data in the same object file.
OutStreamer.SwitchSection(getObjFileLowering().getCStringSection());
} }
// Use unified assembler syntax. // Use unified assembler syntax.

18
test/DebugInfo/ARM/sectionorder.ll Normal file
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@ -0,0 +1,18 @@
; RUN: llc -filetype=asm %s -o - | FileCheck %s
; Verifies that the DWARF* sections come _after_ the __TEXT sections.
; rdar://problem/15623193
; CHECK: .section __TEXT,__text,
; CHECK-NOT: __DWARF,__debug
; CHECK: .section __TEXT,__cstring,cstring_literals
target triple = "thumbv7-apple-ios"
!llvm.module.flags = !{!3, !4}
!llvm.dbg.cu = !{!0}
!0 = metadata !{i32 786449, i32 0, i32 12, metadata !"test.c", metadata !"/Volumes/Data/radar/15623193", metadata !"LLVM", i1 true, i1 false, metadata !"", i32 0, metadata !1, metadata !1, metadata !1, metadata !1} ; [ DW_TAG_compile_unit ] [/Volumes/Data/radar/15623193/test.c] [DW_LANG_C99]
!1 = metadata !{metadata !2}
!2 = metadata !{i32 0}
!3 = metadata !{i32 2, metadata !"Dwarf Version", i32 2}
!4 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}