[llvm] [hwasan] Add intrinsics for fixed shadow on Aarch64 (PR #89319)

[Florian Mayer via llvm-commits]

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@@ -551,17 +553,28 @@ void AArch64AsmPrinter::LowerKCFI_CHECK(const MachineInstr &MI) {
 void AArch64AsmPrinter::LowerHWASAN_CHECK_MEMACCESS(const MachineInstr &MI) {
   Register Reg = MI.getOperand(0).getReg();
   bool IsShort =
-      MI.getOpcode() == AArch64::HWASAN_CHECK_MEMACCESS_SHORTGRANULES;
+      ((MI.getOpcode() == AArch64::HWASAN_CHECK_MEMACCESS_SHORTGRANULES) ||
+       (MI.getOpcode() ==
+        AArch64::HWASAN_CHECK_MEMACCESS_SHORTGRANULES_FIXEDSHADOW));
   uint32_t AccessInfo = MI.getOperand(1).getImm();
-  MCSymbol *&Sym =
-      HwasanMemaccessSymbols[HwasanMemaccessTuple(Reg, IsShort, AccessInfo)];
+  bool IsFixedShadow =
+      ((MI.getOpcode() == AArch64::HWASAN_CHECK_MEMACCESS_FIXEDSHADOW) ||
+       (MI.getOpcode() ==
+        AArch64::HWASAN_CHECK_MEMACCESS_SHORTGRANULES_FIXEDSHADOW));
+  uint64_t FixedShadowOffset = IsFixedShadow ? MI.getOperand(2).getImm() : 0;
+
+  MCSymbol *&Sym = HwasanMemaccessSymbols[HwasanMemaccessTuple(
+      Reg, IsShort, AccessInfo, IsFixedShadow, FixedShadowOffset)];
   if (!Sym) {
     // FIXME: Make this work on non-ELF.
     if (!TM.getTargetTriple().isOSBinFormatELF())
       report_fatal_error("llvm.hwasan.check.memaccess only supported on ELF");
 
     std::string SymName = "__hwasan_check_x" + utostr(Reg - AArch64::X0) + "_" +
                           utostr(AccessInfo);
+    if (IsFixedShadow) {
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fmayer wrote:

(I don't like it but) LLVM style is to omit {} for single statement

https://github.com/llvm/llvm-project/pull/89319