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[PowerPC] Support TLS variables in debug info

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This adds an implementation of getDebugThreadLocalSymbol for
(64-bit) PowerPC.  This needs to return a generic MCExpr
since on ppc64, we need to add a bias of 0x8000 to the
value returned by the R_PPC64_DTPREL64 relocation.

llvm-svn: 185461
This commit is contained in:
Ulrich Weigand 2013-07-02 18:47:35 +00:00
parent bfd7811afa
commit 5ce70db696
4 changed files with 53 additions and 3 deletions
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10
lib/Target/PowerPC/PPCTargetObjectFile.cpp
View File

@ -55,3 +55,13 @@ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
return DefaultSection;
}
const MCExpr *PPC64LinuxTargetObjectFile::
getDebugThreadLocalSymbol(const MCSymbol *Sym) const {
const MCExpr *Expr =
MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_PPC_DTPREL, getContext());
return MCBinaryExpr::CreateAdd(Expr,
MCConstantExpr::Create(0x8000, getContext()),
getContext());
}

3
lib/Target/PowerPC/PPCTargetObjectFile.h
View File

@ -25,6 +25,9 @@ namespace llvm {
virtual const MCSection *
SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const;
/// \brief Describe a TLS variable address within debug info.
virtual const MCExpr *getDebugThreadLocalSymbol(const MCSymbol *Sym) const;
};
} // end namespace llvm

31
test/DebugInfo/PowerPC/tls-fission.ll Normal file
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@ -0,0 +1,31 @@
; RUN: llc -split-dwarf=Enable -mtriple=powerpc64-unknown-linux-gnu -O0 -filetype=asm < %s | FileCheck %s
; FIXME: add relocation and DWARF expression support to llvm-dwarfdump & use
; that here instead of raw assembly printing
; CHECK: debug_info.dwo
; 3 bytes of data in this DW_FORM_block1 representation of the location of 'tls'
; CHECK: .byte 3{{ *}}# DW_AT_location
; DW_OP_const_index (0xfx == 252) to refer to the debug_addr table
; CHECK-NEXT: .byte 252
; an index of zero into the debug_addr table
; CHECK-NEXT: .byte 0
; DW_OP_GNU_push_tls_address
; CHECK-NEXT: .byte 224
; check that the expected TLS address description is the first thing in the debug_addr section
; CHECK: debug_addr
; CHECK-NEXT: .quad tls@dtprel+32768
@tls = thread_local global i32 0, align 4
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!7}
!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.4 ", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !2, metadata !3, metadata !2, metadata !"tls.dwo"} ; [ DW_TAG_compile_unit ] [/tmp/tls.cpp] [DW_LANG_C_plus_plus]
!1 = metadata !{metadata !"tls.cpp", metadata !"/tmp"}
!2 = metadata !{i32 0}
!3 = metadata !{metadata !4}
!4 = metadata !{i32 786484, i32 0, null, metadata !"tls", metadata !"tls", metadata !"", metadata !5, i32 1, metadata !6, i32 0, i32 1, i32* @tls, null} ; [ DW_TAG_variable ] [tls] [line 1] [def]
!5 = metadata !{i32 786473, metadata !1} ; [ DW_TAG_file_type ] [/tmp/tls.cpp]
!6 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
!7 = metadata !{i32 2, metadata !"Dwarf Version", i32 3}

12
test/DebugInfo/PowerPC/tls.ll
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@ -1,10 +1,16 @@
; RUN: llc -mtriple=powerpc-unknown-unknown -O0 -filetype=asm < %s | FileCheck %s
; RUN: llc -mtriple=powerpc64-unknown-linux-gnu -O0 -filetype=asm < %s | FileCheck %s
; FIXME: add relocation and DWARF expression support to llvm-dwarfdump & use
; that here instead of raw assembly printing
; CHECK: debug_info
; CHECK-NOT: tls@DTPOFF
; 10 bytes of data in this DW_FORM_block1 representation of the location of 'tls'
; CHECK: .byte 10{{ *}}# DW_AT_location
; DW_OP_const8u
; CHECK: .byte 14
; The debug relocation of the address of the tls variable
; CHECK: .quad tls@dtprel+32768
; DW_OP_GNU_push_tls_address
; CHECK: .byte 224
@tls = thread_local global i32 7, align 4