Revert "[AArch64][DebugInfo] Do not recompute CalleeSavedStackSize"

Summary:
This reverts commit r372204.

This change causes build bot failures under msan:
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fast/builds/35236/steps/check-llvm%20msan/logs/stdio:

```
FAIL: LLVM :: DebugInfo/AArch64/asan-stack-vars.mir (19531 of 33579)
******************** TEST 'LLVM :: DebugInfo/AArch64/asan-stack-vars.mir' FAILED ********************
Script:
--
: 'RUN: at line 1';   /b/sanitizer-x86_64-linux-fast/build/llvm_build_msan/bin/llc -O0 -start-before=livedebugvalues -filetype=obj -o - /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/DebugInfo/AArch64/asan-stack-vars.mir | /b/sanitizer-x86_64-linux-fast/build/llvm_build_msan/bin/llvm-dwarfdump -v - | /b/sanitizer-x86_64-linux-fast/build/llvm_build_msan/bin/FileCheck /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/DebugInfo/AArch64/asan-stack-vars.mir
--
Exit Code: 2

Command Output (stderr):
--
==62894==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0xdfcafb in llvm::AArch64FrameLowering::resolveFrameOffsetReference(llvm::MachineFunction const&, int, bool, unsigned int&, bool, bool) const /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/lib/Target/AArch64/AArch64FrameLowering.cpp:1658:3
    #1 0xdfae8a in resolveFrameIndexReference /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/lib/Target/AArch64/AArch64FrameLowering.cpp:1580:10
    #2 0xdfae8a in llvm::AArch64FrameLowering::getFrameIndexReference(llvm::MachineFunction const&, int, unsigned int&) const /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/lib/Target/AArch64/AArch64FrameLowering.cpp:1536
    #3 0x46642c1 in (anonymous namespace)::LiveDebugValues::extractSpillBaseRegAndOffset(llvm::MachineInstr const&) /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/lib/CodeGen/LiveDebugValues.cpp:582:21
    #4 0x4647cb3 in transferSpillOrRestoreInst /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/lib/CodeGen/LiveDebugValues.cpp:883:11
    #5 0x4647cb3 in process /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/lib/CodeGen/LiveDebugValues.cpp:1079
    #6 0x4647cb3 in (anonymous namespace)::LiveDebugValues::ExtendRanges(llvm::MachineFunction&) /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/lib/CodeGen/LiveDebugValues.cpp:1361
    #7 0x463ac0e in (anonymous namespace)::LiveDebugValues::runOnMachineFunction(llvm::MachineFunction&) /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/lib/CodeGen/LiveDebugValues.cpp:1415:18
    #8 0x4854ef0 in llvm::MachineFunctionPass::runOnFunction(llvm::Function&) /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/lib/CodeGen/MachineFunctionPass.cpp:73:13
    #9 0x53b0b01 in llvm::FPPassManager::runOnFunction(llvm::Function&) /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1648:27
    #10 0x53b15f6 in llvm::FPPassManager::runOnModule(llvm::Module&) /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1685:16
    #11 0x53b298d in runOnModule /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1750:27
    #12 0x53b298d in llvm::legacy::PassManagerImpl::run(llvm::Module&) /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1863
    #13 0x905f21 in compileModule(char**, llvm::LLVMContext&) /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/tools/llc/llc.cpp:601:8
    #14 0x8fdc4e in main /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/tools/llc/llc.cpp:355:22
    #15 0x7f67673632e0 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x202e0)
    #16 0x882369 in _start (/b/sanitizer-x86_64-linux-fast/build/llvm_build_msan/bin/llc+0x882369)

MemorySanitizer: use-of-uninitialized-value /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/lib/Target/AArch64/AArch64FrameLowering.cpp:1658:3 in llvm::AArch64FrameLowering::resolveFrameOffsetReference(llvm::MachineFunction const&, int, bool, unsigned int&, bool, bool) const
Exiting
error: -: The file was not recognized as a valid object file
FileCheck error: '-' is empty.
FileCheck command line:  /b/sanitizer-x86_64-linux-fast/build/llvm_build_msan/bin/FileCheck /b/sanitizer-x86_64-linux-fast/build/llvm-project/llvm/test/DebugInfo/AArch64/asan-stack-vars.mir
```

Reviewers: bkramer

Reviewed By: bkramer

Subscribers: sdardis, aprantl, kristof.beyls, jrtc27, atanasyan, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67710

llvm-svn: 372228

include/llvm/CodeGen/TargetFrameLowering.h

@@ -281,11 +281,6 @@ public:
     return getFrameIndexReference(MF, FI, FrameReg);
   }
 
-  /// Returns the callee-saved registers as computed by determineCalleeSaves
-  /// in the BitVector \p SavedRegs.
-  virtual void getCalleeSaves(const MachineFunction &MF,
-                                  BitVector &SavedRegs) const;
-
   /// This method determines which of the registers reported by
   /// TargetRegisterInfo::getCalleeSavedRegs() should actually get saved.
   /// The default implementation checks populates the \p SavedRegs bitset with
@@ -293,9 +288,6 @@ public:
   /// this function to save additional registers.
   /// This method also sets up the register scavenger ensuring there is a free
   /// register or a frameindex available.
-  /// This method should not be called by any passes outside of PEI, because
-  /// it may change state passed in by \p MF and \p RS. The preferred
-  /// interface outside PEI is getCalleeSaves.
   virtual void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
                                     RegScavenger *RS = nullptr) const;
 

lib/CodeGen/LiveDebugValues.cpp

@@ -1409,7 +1409,8 @@ bool LiveDebugValues::runOnMachineFunction(MachineFunction &MF) {
   TRI = MF.getSubtarget().getRegisterInfo();
   TII = MF.getSubtarget().getInstrInfo();
   TFI = MF.getSubtarget().getFrameLowering();
-  TFI->getCalleeSaves(MF, CalleeSavedRegs);
+  TFI->determineCalleeSaves(MF, CalleeSavedRegs,
+                            std::make_unique<RegScavenger>().get());
   LS.initialize(MF);
 
   bool Changed = ExtendRanges(MF);

lib/CodeGen/RegUsageInfoCollector.cpp

@@ -56,7 +56,7 @@ public:
 
   bool runOnMachineFunction(MachineFunction &MF) override;
 
-  // Call getCalleeSaves and then also set the bits for subregs and
+  // Call determineCalleeSaves and then also set the bits for subregs and
   // fully saved superregs.
   static void computeCalleeSavedRegs(BitVector &SavedRegs, MachineFunction &MF);
 
@@ -199,7 +199,7 @@ computeCalleeSavedRegs(BitVector &SavedRegs, MachineFunction &MF) {
 
   // Target will return the set of registers that it saves/restores as needed.
   SavedRegs.clear();
-  TFI.getCalleeSaves(MF, SavedRegs);
+  TFI.determineCalleeSaves(MF, SavedRegs);
   if (SavedRegs.none())
     return;
 

lib/CodeGen/TargetFrameLoweringImpl.cpp

@@ -59,19 +59,6 @@ bool TargetFrameLowering::needsFrameIndexResolution(
   return MF.getFrameInfo().hasStackObjects();
 }
 
-void TargetFrameLowering::getCalleeSaves(const MachineFunction &MF,
-                                         BitVector &CalleeSaves) const {
-  const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo();
-  CalleeSaves.resize(TRI.getNumRegs());
-
-  const MachineFrameInfo &MFI = MF.getFrameInfo();
-  if (!MFI.isCalleeSavedInfoValid())
-    return;
-
-  for (const CalleeSavedInfo &Info : MFI.getCalleeSavedInfo())
-    CalleeSaves.set(Info.getReg());
-}
-
 void TargetFrameLowering::determineCalleeSaves(MachineFunction &MF,
                                                BitVector &SavedRegs,
                                                RegScavenger *RS) const {
@@ -140,4 +127,4 @@ int TargetFrameLowering::getInitialCFAOffset(const MachineFunction &MF) const {
 unsigned TargetFrameLowering::getInitialCFARegister(const MachineFunction &MF)
     const {
   llvm_unreachable("getInitialCFARegister() not implemented!");
-}
+}

lib/Target/AArch64/AArch64FrameLowering.cpp

@@ -2225,10 +2225,6 @@ void AArch64FrameLowering::determineCalleeSaves(MachineFunction &MF,
                << EstimatedStackSize + AlignedCSStackSize
                << " bytes.\n");
 
-  assert((!MFI.isCalleeSavedInfoValid() ||
-          AFI->getCalleeSavedStackSize() == AlignedCSStackSize) &&
-         "Should not invalidate callee saved info");
-
   // Round up to register pair alignment to avoid additional SP adjustment
   // instructions.
   AFI->setCalleeSavedStackSize(AlignedCSStackSize);

lib/Target/ARM/ARMFrameLowering.cpp

@@ -2128,16 +2128,10 @@ void ARMFrameLowering::determineCalleeSaves(MachineFunction &MF,
     AFI->setLRIsSpilledForFarJump(true);
   }
   AFI->setLRIsSpilled(SavedRegs.test(ARM::LR));
-}
-
-void ARMFrameLowering::getCalleeSaves(const MachineFunction &MF,
-                                      BitVector &SavedRegs) const {
-  TargetFrameLowering::getCalleeSaves(MF, SavedRegs);
 
   // If we have the "returned" parameter attribute which guarantees that we
   // return the value which was passed in r0 unmodified (e.g. C++ 'structors),
   // record that fact for IPRA.
-  const ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
   if (AFI->getPreservesR0())
     SavedRegs.set(ARM::R0);
 }

lib/Target/ARM/ARMFrameLowering.h

@@ -53,8 +53,6 @@ public:
   int ResolveFrameIndexReference(const MachineFunction &MF, int FI,
                                  unsigned &FrameReg, int SPAdj) const;
 
-  void getCalleeSaves(const MachineFunction &MF,
-                      BitVector &SavedRegs) const override;
   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
                             RegScavenger *RS) const override;
 

test/CodeGen/AArch64/wrong-callee-save-size-after-livedebugvariables.mir

@@ -1,92 +0,0 @@
-# RUN: llc -start-before=prologepilog -filetype=obj -o %t %s
-# RUN: llvm-dwarfdump --name=obj1 %t | FileCheck %s --check-prefix=CHECKDWARF1
-# RUN: llvm-dwarfdump --name=obj2 %t | FileCheck %s --check-prefix=CHECKDWARF2
-# RUN: llvm-objdump --disassemble %t | FileCheck %s --check-prefix=CHECKASM
-#
-# Test that the location for obj1 and obj2 in the debug information is
-# the same as the location used by load instructions.
-#
-# CHECKDWARF1: DW_AT_location    (DW_OP_fbreg -1)
-# CHECKDWARF2: DW_AT_location    (DW_OP_fbreg -2)
-# CHECKASM: ldurb   w0, [x29, #-1]
-# CHECKASM: ldurb   w1, [x29, #-2]
---- |
-  ; ModuleID = 'wrong-callee-save-size-after-livedebugvariables.c'
-  source_filename = "wrong-callee-save-size-after-livedebugvariables.c"
-  target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
-  target triple = "aarch64-unknown-linux-gnu"
-
-  ; Function Attrs: noinline nounwind optnone
-  define dso_local i8 @foo() #0 !dbg !7 {
-  entry:
-    %obj1 = alloca i8, align 1
-    %obj2 = alloca i8, align 1
-    %obj3 = alloca [238 x i8], align 1
-    ret i8 undef, !dbg !24
-  }
-
-  declare dso_local i8 @bar(i8, i8, i8*) #0
-
-  attributes #0 = { noinline nounwind optnone "frame-pointer"="all" }
-
-  !llvm.dbg.cu = !{!0}
-  !llvm.module.flags = !{!3, !4, !5}
-  !llvm.ident = !{!6}
-
-  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
-  !1 = !DIFile(filename: "wrong-callee-save-size-after-livedebugvariables.c", directory: "")
-  !2 = !{}
-  !3 = !{i32 2, !"Dwarf Version", i32 4}
-  !4 = !{i32 2, !"Debug Info Version", i32 3}
-  !5 = !{i32 1, !"wchar_size", i32 4}
-  !6 = !{!"clang version 10.0.0"}
-  !7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
-  !8 = !DISubroutineType(types: !9)
-  !9 = !{!10}
-  !10 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_unsigned_char)
-  !11 = !DILocalVariable(name: "obj1", scope: !7, file: !1, line: 4, type: !10)
-  !12 = !DILocation(line: 4, column: 8, scope: !7)
-  !13 = !DILocalVariable(name: "obj2", scope: !7, file: !1, line: 5, type: !10)
-  !14 = !DILocation(line: 5, column: 8, scope: !7)
-  !15 = !DILocalVariable(name: "obj3", scope: !7, file: !1, line: 6, type: !16)
-  !16 = !DICompositeType(tag: DW_TAG_array_type, baseType: !10, size: 1904, elements: !17)
-  !17 = !{!18}
-  !18 = !DISubrange(count: 238)
-  !19 = !DILocation(line: 6, column: 8, scope: !7)
-  !20 = !DILocation(line: 7, column: 14, scope: !7)
-  !21 = !DILocation(line: 7, column: 20, scope: !7)
-  !22 = !DILocation(line: 7, column: 27, scope: !7)
-  !23 = !DILocation(line: 7, column: 10, scope: !7)
-  !24 = !DILocation(line: 7, column: 3, scope: !7)
-
-...
----
-name:            foo
-tracksRegLiveness: true
-frameInfo:
-  hasCalls:        true
-fixedStack:      []
-stack:
-  - { id: 0, name: obj1, type: default, offset: 0, size: 1, alignment: 1,
-      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
-      local-offset: -1, debug-info-variable: '!11', debug-info-expression: '!DIExpression()',
-      debug-info-location: '!12' }
-  - { id: 1, name: obj2, type: default, offset: 0, size: 1, alignment: 1,
-      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
-      local-offset: -2, debug-info-variable: '!13', debug-info-expression: '!DIExpression()',
-      debug-info-location: '!14' }
-  - { id: 2, name: obj3, type: default, offset: 0, size: 238, alignment: 1,
-      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
-      local-offset: -240, debug-info-variable: '!15', debug-info-expression: '!DIExpression()',
-      debug-info-location: '!19' }
-body:             |
-  bb.1.entry:
-    renamable $x2 = ADDXri %stack.2.obj3, 0, 0
-    renamable $w0 = LDRBBui %stack.0.obj1, 0, debug-location !20 :: (load 1 from %ir.obj1)
-    renamable $w1 = LDRBBui %stack.1.obj2, 0, debug-location !21 :: (load 1 from %ir.obj2)
-    ADJCALLSTACKDOWN 0, 0, implicit-def $sp, implicit $sp, debug-location !23
-    BL @bar, csr_aarch64_aapcs, implicit-def $lr, implicit $sp, implicit killed $w0, implicit killed $w1, implicit killed $x2, implicit-def $w0, debug-location !23
-    ADJCALLSTACKUP 0, 0, implicit-def $sp, implicit $sp, debug-location !23
-    RET_ReallyLR implicit killed $w0, debug-location !24
-
-...

test/DebugInfo/MIR/Mips/live-debug-values-reg-copy.mir

@@ -1,4 +1,4 @@
-# RUN: llc -start-before=prologepilog -stop-after=livedebugvalues %s -o - | FileCheck %s
+# RUN: llc -run-pass=livedebugvalues %s -o - | FileCheck %s
 #
 # This test tests tracking variables value transferring from one register to another.
 # This example is altered additionally in order to test transferring from one float register

test/DebugInfo/MIR/X86/live-debug-values-reg-copy.mir

@@ -1,4 +1,4 @@
-# RUN: llc -start-before=prologepilog -stop-after=livedebugvalues %s -o - | FileCheck %s
+# RUN: llc -run-pass=livedebugvalues %s -o - | FileCheck %s
 #
 # This test tests tracking variables value transferring from one register to another.
 # This example is altered additionally in order to test transferring from one float register