Add a pre-dispatch SjLj EH hook on the unwind edge for targets to do any
setup they require. Use this for ARM/Darwin to rematerialize the base
pointer from the frame pointer when required. rdar://8564268
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116879 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMExpandPseudoInsts.cpp b/lib/Target/ARM/ARMExpandPseudoInsts.cpp
index e16c07d..bbfd627 100644
--- a/lib/Target/ARM/ARMExpandPseudoInsts.cpp
+++ b/lib/Target/ARM/ARMExpandPseudoInsts.cpp
@@ -18,10 +18,14 @@
#include "ARM.h"
#include "ARMAddressingModes.h"
#include "ARMBaseInstrInfo.h"
+#include "ARMBaseRegisterInfo.h"
+#include "ARMMachineFunctionInfo.h"
#include "ARMRegisterInfo.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Support/raw_ostream.h" // FIXME: for debug only. remove!
using namespace llvm;
namespace {
@@ -30,7 +34,7 @@
static char ID;
ARMExpandPseudo() : MachineFunctionPass(ID) {}
- const TargetInstrInfo *TII;
+ const ARMBaseInstrInfo *TII;
const TargetRegisterInfo *TRI;
virtual bool runOnMachineFunction(MachineFunction &Fn);
@@ -576,6 +580,38 @@
ModifiedOp = false;
break;
+ case ARM::Int_eh_sjlj_dispatchsetup: {
+ MachineFunction &MF = *MI.getParent()->getParent();
+ const ARMBaseInstrInfo *AII =
+ static_cast<const ARMBaseInstrInfo*>(TII);
+ const ARMBaseRegisterInfo &RI = AII->getRegisterInfo();
+ // For functions using a base pointer, we rematerialize it (via the frame
+ // pointer) here since eh.sjlj.setjmp and eh.sjlj.longjmp don't do it
+ // for us. Otherwise, expand to nothing.
+ if (RI.hasBasePointer(MF)) {
+ ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
+ int32_t NumBytes = AFI->getFramePtrSpillOffset();
+ unsigned FramePtr = RI.getFrameRegister(MF);
+ assert (RI.hasFP(MF) && "base pointer without frame pointer?");
+
+ if (AFI->isThumb2Function()) {
+ llvm::emitT2RegPlusImmediate(MBB, MBBI, MI.getDebugLoc(), ARM::R6,
+ FramePtr, -NumBytes, ARMCC::AL, 0, *TII);
+ } else if (AFI->isThumbFunction()) {
+ llvm::emitThumbRegPlusImmediate(MBB, MBBI, ARM::R6,
+ FramePtr, -NumBytes,
+ *TII, RI, MI.getDebugLoc());
+ } else {
+ llvm::emitARMRegPlusImmediate(MBB, MBBI, MI.getDebugLoc(), ARM::R6,
+ FramePtr, -NumBytes, ARMCC::AL, 0,
+ *TII);
+ }
+
+ }
+ MI.eraseFromParent();
+ break;
+ }
+
case ARM::MOVsrl_flag:
case ARM::MOVsra_flag: {
// These are just fancy MOVs insructions.
@@ -953,7 +989,7 @@
}
bool ARMExpandPseudo::runOnMachineFunction(MachineFunction &MF) {
- TII = MF.getTarget().getInstrInfo();
+ TII = static_cast<const ARMBaseInstrInfo*>(MF.getTarget().getInstrInfo());
TRI = MF.getTarget().getRegisterInfo();
bool Modified = false;