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AArch64/ARM64: port across stub handling for ELF C++ exceptions.

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The most important part here is that we should actuall emit the stubs we refer
to in the exception table, but as a side issue this uses more sensible & GCC
compatible representations for some of the bits of information.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206380 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tim Northover 2014-04-16 11:52:55 +00:00
parent fef8e383eb
commit 1a44333f0e
3 changed files with 39 additions and 6 deletions
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5
lib/MC/MCObjectFileInfo.cpp
View File

@ -289,8 +289,9 @@ void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
TTypeEncoding = (CMModel == CodeModel::Small)
? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
}
} else if (T.getArch() == Triple::aarch64 ||
T.getArch() == Triple::aarch64_be ) {
} else if (T.getArch() == Triple::aarch64 ||
T.getArch() == Triple::aarch64_be ||
T.getArch() == Triple::arm64) {
// The small model guarantees static code/data size < 4GB, but not where it
// will be in memory. Most of these could end up >2GB away so even a signed
// pc-relative 32-bit address is insufficient, theoretically.

35
lib/Target/ARM64/ARM64AsmPrinter.cpp
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@ -17,6 +17,7 @@
#include "ARM64MachineFunctionInfo.h"
#include "ARM64MCInstLower.h"
#include "ARM64RegisterInfo.h"
#include "ARM64Subtarget.h"
#include "InstPrinter/ARM64InstPrinter.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringSwitch.h"
@ -24,6 +25,8 @@
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/StackMaps.h"
#include "llvm/CodeGen/MachineModuleInfoImpls.h"
#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/MC/MCAsmInfo.h"
@ -39,13 +42,18 @@ using namespace llvm;
namespace {
class ARM64AsmPrinter : public AsmPrinter {
/// Subtarget - Keep a pointer to the ARM64Subtarget around so that we can
/// make the right decision when printing asm code for different targets.
const ARM64Subtarget *Subtarget;
ARM64MCInstLower MCInstLowering;
StackMaps SM;
public:
ARM64AsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
: AsmPrinter(TM, Streamer), MCInstLowering(OutContext, *Mang, *this),
SM(*this), ARM64FI(NULL), LOHLabelCounter(0) {}
: AsmPrinter(TM, Streamer), Subtarget(&TM.getSubtarget<ARM64Subtarget>()),
MCInstLowering(OutContext, *Mang, *this), SM(*this), ARM64FI(NULL),
LOHLabelCounter(0) {}
virtual const char *getPassName() const { return "ARM64 Assembly Printer"; }
@ -119,6 +127,29 @@ void ARM64AsmPrinter::EmitEndOfAsmFile(Module &M) {
// generates code that does this, it is always safe to set.
OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
SM.serializeToStackMapSection();
// Emit a .data.rel section containing any stubs that were created.
if (Subtarget->isTargetELF()) {
const TargetLoweringObjectFileELF &TLOFELF =
static_cast<const TargetLoweringObjectFileELF &>(getObjFileLowering());
MachineModuleInfoELF &MMIELF = MMI->getObjFileInfo<MachineModuleInfoELF>();
// Output stubs for external and common global variables.
MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
if (!Stubs.empty()) {
OutStreamer.SwitchSection(TLOFELF.getDataRelSection());
const DataLayout *TD = TM.getDataLayout();
for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
OutStreamer.EmitLabel(Stubs[i].first);
OutStreamer.EmitSymbolValue(Stubs[i].second.getPointer(),
TD->getPointerSize(0));
}
Stubs.clear();
}
}
}
MachineLocation

5
test/CodeGen/AArch64/pic-eh-stubs.ll
View File

@ -1,5 +1,6 @@
; RUN: llc -mtriple=aarch64-none-linux-gnu -relocation-model=pic -o - %s | FileCheck %s
; RUN: llc -mtriple=aarch64_be-none-linux-gnu -relocation-model=pic -o - %s | FileCheck %s
; RUN: llc -mtriple=arm64-none-linux-gnu -relocation-model=pic -o - %s | FileCheck %s
; Make sure exception-handling PIC code can be linked correctly. An alternative
; to the sequence described below would have .gcc_except_table itself writable
@ -11,8 +12,8 @@
; ... referring indirectly to stubs for its typeinfo ...
; CHECK: // @TType Encoding = indirect pcrel sdata8
; ... one of which is "int"'s typeinfo
; CHECK: .Ltmp7:
; CHECK-NEXT: .xword .L_ZTIi.DW.stub-.Ltmp7
; CHECK: [[TYPEINFO_LBL:.Ltmp[0-9]+]]: // TypeInfo 1
; CHECK-NEXT: .xword .L_ZTIi.DW.stub-[[TYPEINFO_LBL]]
; .. and which is properly defined (in a writable section for the dynamic loader) later.
; CHECK: .section .data.rel,"aw"