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[mips] Make TTypeEncoding indirect to allow .eh_frame to be read-only. 

Summary:
Following on from r209907 which made personality encodings indirect, do the
same for TType encodings. This fixes the case where a try/catch block needs
to generate references to, for example, std::exception in the
.gcc_except_table.

Previous attempts at committing this broke the buildbots due to bugs in IAS.
These bugs have now been fixed so trying again.

Reviewers: petarj

Reviewed By: petarj

Subscribers: srhines, joerg, tberghammer, llvm-commits

Differential Revision: http://reviews.llvm.org/D9669

llvm-svn: 238863
This commit is contained in:
Daniel Sanders 2015-06-02 20:32:50 +00:00
parent acbea8fb37
commit c95f3f8c95
2 changed files with 28 additions and 10 deletions
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12
llvm/lib/MC/MCObjectFileInfo.cpp
View File

@ -324,10 +324,16 @@ void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
case Triple::mipsel:
case Triple::mips64:
case Triple::mips64el:
// MIPS uses indirect pointer to refer personality functions, so that the
// eh_frame section can be read-only. DW.ref.personality will be generated
// for relocation.
// MIPS uses indirect pointer to refer personality functions and types, so
// that the eh_frame section can be read-only. DW.ref.personality will be
// generated for relocation.
PersonalityEncoding = dwarf::DW_EH_PE_indirect;
// FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't
// identify N64 from just a triple.
TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
dwarf::DW_EH_PE_sdata4;
// We don't support PC-relative LSDA references in GAS so we use the default
// DW_EH_PE_absptr for those.
break;
case Triple::ppc64:
case Triple::ppc64le:

26
llvm/test/CodeGen/Mips/ehframe-indirect.ll
View File

@ -1,9 +1,11 @@
; RUN: llc -mtriple=mipsel-linux-gnu < %s | FileCheck -check-prefix=ALL -check-prefix=O32 %s
; RUN: llc -mtriple=mipsel-linux-android < %s | FileCheck -check-prefix=ALL -check-prefix=O32 %s
; RUN: llc -mtriple=mips64el-linux-gnu -target-abi=n32 < %s | FileCheck -check-prefix=ALL -check-prefix=N32 %s
; RUN: llc -mtriple=mips64el-linux-android -target-abi=n32 < %s | FileCheck -check-prefix=ALL -check-prefix=N32 %s
; RUN: llc -mtriple=mips64el-linux-gnu < %s | FileCheck -check-prefix=ALL -check-prefix=N64 %s
; RUN: llc -mtriple=mips64el-linux-android < %s | FileCheck -check-prefix=ALL -check-prefix=N64 %s
; RUN: llc -mtriple=mipsel-linux-gnu < %s -asm-verbose | FileCheck -check-prefix=ALL -check-prefix=O32 %s
; RUN: llc -mtriple=mipsel-linux-android < %s -asm-verbose | FileCheck -check-prefix=ALL -check-prefix=O32 %s
; RUN: llc -mtriple=mips64el-linux-gnu -target-abi=n32 < %s -asm-verbose | FileCheck -check-prefix=ALL -check-prefix=N32 %s
; RUN: llc -mtriple=mips64el-linux-android -target-abi=n32 < %s -asm-verbose | FileCheck -check-prefix=ALL -check-prefix=N32 %s
; RUN: llc -mtriple=mips64el-linux-gnu < %s -asm-verbose | FileCheck -check-prefix=ALL -check-prefix=N64 %s
; RUN: llc -mtriple=mips64el-linux-android < %s -asm-verbose | FileCheck -check-prefix=ALL -check-prefix=N64 %s
@_ZTISt9exception = external constant i8*
define i32 @main() {
; ALL: .cfi_startproc
@ -16,7 +18,9 @@ entry:
lpad:
%0 = landingpad { i8*, i32 } personality i8*
bitcast (i32 (...)* @__gxx_personality_v0 to i8*) catch i8* null
bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
catch i8* null
catch i8* bitcast (i8** @_ZTISt9exception to i8*)
ret i32 0
cont:
@ -28,6 +32,14 @@ declare i32 @__gxx_personality_v0(...)
declare void @foo()
; ALL: GCC_except_table{{[0-9]+}}:
; ALL: .byte 155 # @TType Encoding = indirect pcrel sdata4
; ALL: $[[PC_LABEL:tmp[0-9]+]]:
; ALL: .4byte ($_ZTISt9exception.DW.stub)-($[[PC_LABEL]])
; ALL: $_ZTISt9exception.DW.stub:
; O32: .4byte _ZTISt9exception
; N32: .4byte _ZTISt9exception
; N64: .8byte _ZTISt9exception
; ALL: .hidden DW.ref.__gxx_personality_v0
; ALL: .weak DW.ref.__gxx_personality_v0
; ALL: .section .data.DW.ref.__gxx_personality_v0,"aGw",@progbits,DW.ref.__gxx_personality_v0,comdat