[llvm] [AArch64] Fix the size passed to __trampoline_setup (PR #118234)

[via llvm-commits]

https://github.com/ssijaric-nv created https://github.com/llvm/llvm-project/pull/118234

The trampoline size is 36 bytes on AArch64. The runtime function __trampoline_setup
aborts as it expects the trampoline size of at least 36 bytes, and the size passed
is 20 bytes. Fix the inconsistency in AArch64TargetLowering::LowerINIT_TRAMPOLINE.


>From 557cd59f0a2fdb02cd256ff8139bbe03c0d5341a Mon Sep 17 00:00:00 2001
From: Sanjin Sijaric <ssijaric at nvidia.com>
Date: Sun, 1 Dec 2024 14:25:13 -0800
Subject: [PATCH] [AArch64] Fix the size passed to __trampoline_setup

The trampoline size is 36 bytes on AArch64. The runtime function __trampoline_setup
aborts as it expects the trampoline size of at least 36 bytes, and the size passed
is 20 bytes. Fix the inconsistency in AArch64TargetLowering::LowerINIT_TRAMPOLINE.
---
 llvm/lib/Target/AArch64/AArch64ISelLowering.cpp | 11 +++++++++--
 llvm/test/CodeGen/AArch64/trampoline.ll         |  1 +
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
index e1be825fcf7bf3..418cef075ba65f 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -7148,9 +7148,16 @@ SDValue AArch64TargetLowering::LowerINIT_TRAMPOLINE(SDValue Op,
   Entry.Ty = IntPtrTy;
   Entry.Node = Trmp;
   Args.push_back(Entry);
-  Entry.Node = DAG.getConstant(20, dl, MVT::i64);
-  Args.push_back(Entry);
 
+  if (auto *FI = dyn_cast<FrameIndexSDNode>(Trmp.getNode())) {
+    MachineFunction &MF = DAG.getMachineFunction();
+    MachineFrameInfo &MFI = MF.getFrameInfo();
+    Entry.Node =
+        DAG.getConstant(MFI.getObjectSize(FI->getIndex()), dl, MVT::i64);
+  } else
+    Entry.Node = DAG.getConstant(36, dl, MVT::i64);
+
+  Args.push_back(Entry);
   Entry.Node = FPtr;
   Args.push_back(Entry);
   Entry.Node = Nest;
diff --git a/llvm/test/CodeGen/AArch64/trampoline.ll b/llvm/test/CodeGen/AArch64/trampoline.ll
index 293e538a7459d4..217cda1a4ce1ca 100644
--- a/llvm/test/CodeGen/AArch64/trampoline.ll
+++ b/llvm/test/CodeGen/AArch64/trampoline.ll
@@ -12,6 +12,7 @@ define i64 @main() {
   %val = alloca i64
   %nval = bitcast ptr %val to ptr
   %tramp = alloca [36 x i8], align 8
+  ; CHECK:	mov	w1, #36
   ; CHECK:	bl	__trampoline_setup
   call void @llvm.init.trampoline(ptr %tramp, ptr @f, ptr %nval)
   %fp = call ptr @llvm.adjust.trampoline(ptr %tramp)