[llvm] [NFC][MC][Sparc] Move definitions of decode functions (PR #154973)

[Rahul Joshi via llvm-commits]

https://github.com/jurahul created https://github.com/llvm/llvm-project/pull/154973

Some of the decode function were previously declared before including `SparcGenDisassemblerTables.inc` and then defined later on because the generated code in `SparcGenDisassemblerTables.inc` references these functions and these functions reference `fieldFromInstruction` which used to be generated.

Now that `fieldFromInstruction` has moved to MCDecoder.h, we can move these definitions to before including the generated code without any circular references.

>From 7efeda4aa91d3bd445886c21da610af07f20aa32 Mon Sep 17 00:00:00 2001
From: Rahul Joshi <rjoshi at nvidia.com>
Date: Fri, 22 Aug 2025 08:45:12 -0700
Subject: [PATCH] [NFC][MC][Sparc] Move definitions of decode functions

Some of the decode function were previously declared before
including `SparcGenDisassemblerTables.inc` and then defined later
on because the generated code in `SparcGenDisassemblerTables.inc`
references these functions and these functions reference
`fieldFromInstruction` which used to be generated.

Now that `fieldFromInstruction` has moved to MCDecoder.h, we can
move these definitions to before including the generated code
without any circular references.
---
 .../Sparc/Disassembler/SparcDisassembler.cpp  | 88 ++++++++-----------
 1 file changed, 39 insertions(+), 49 deletions(-)

diff --git a/llvm/lib/Target/Sparc/Disassembler/SparcDisassembler.cpp b/llvm/lib/Target/Sparc/Disassembler/SparcDisassembler.cpp
index f1cd9b1ab07ca..ceb0ad0ddfb0d 100644
--- a/llvm/lib/Target/Sparc/Disassembler/SparcDisassembler.cpp
+++ b/llvm/lib/Target/Sparc/Disassembler/SparcDisassembler.cpp
@@ -266,16 +266,48 @@ DecodeCoprocPairRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address,
   return MCDisassembler::Success;
 }
 
-static DecodeStatus DecodeCall(MCInst &Inst, unsigned insn, uint64_t Address,
-                               const MCDisassembler *Decoder);
-static DecodeStatus DecodeSIMM5(MCInst &Inst, unsigned insn, uint64_t Address,
-                                const MCDisassembler *Decoder);
-static DecodeStatus DecodeSIMM13(MCInst &Inst, unsigned insn, uint64_t Address,
-                                 const MCDisassembler *Decoder);
+static bool tryAddingSymbolicOperand(int64_t Value, bool isBranch,
+                                     uint64_t Address, uint64_t Offset,
+                                     uint64_t Width, MCInst &MI,
+                                     const MCDisassembler *Decoder) {
+  return Decoder->tryAddingSymbolicOperand(MI, Value, Address, isBranch, Offset,
+                                           Width, /*InstSize=*/4);
+}
+
+static DecodeStatus DecodeCall(MCInst &MI, unsigned insn, uint64_t Address,
+                               const MCDisassembler *Decoder) {
+  int64_t CallOffset = SignExtend64(fieldFromInstruction(insn, 0, 30), 30) * 4;
+  if (!tryAddingSymbolicOperand(Address + CallOffset, false, Address, 0, 30, MI,
+                                Decoder))
+    MI.addOperand(MCOperand::createImm(CallOffset));
+  return MCDisassembler::Success;
+}
+
+static DecodeStatus DecodeSIMM5(MCInst &MI, unsigned insn, uint64_t Address,
+                                const MCDisassembler *Decoder) {
+  assert(isUInt<5>(insn));
+  MI.addOperand(MCOperand::createImm(SignExtend64<5>(insn)));
+  return MCDisassembler::Success;
+}
+
+static DecodeStatus DecodeSIMM13(MCInst &MI, unsigned insn, uint64_t Address,
+                                 const MCDisassembler *Decoder) {
+  assert(isUInt<13>(insn));
+  MI.addOperand(MCOperand::createImm(SignExtend64<13>(insn)));
+  return MCDisassembler::Success;
+}
+
 template <unsigned N>
 constexpr static DecodeStatus DecodeDisp(MCInst &MI, uint32_t ImmVal,
                                          uint64_t Address,
-                                         const MCDisassembler *Decoder);
+                                         const MCDisassembler *Decoder) {
+  int64_t BranchOffset = SignExtend64(ImmVal, N) * 4;
+  if (!tryAddingSymbolicOperand(Address + BranchOffset, true, Address, 0, N, MI,
+                                Decoder))
+    MI.addOperand(MCOperand::createImm(BranchOffset));
+  return MCDisassembler::Success;
+}
+
 #include "SparcGenDisassemblerTables.inc"
 
 /// Read four bytes from the ArrayRef and return 32 bit word.
@@ -321,45 +353,3 @@ DecodeStatus SparcDisassembler::getInstruction(MCInst &Instr, uint64_t &Size,
 
   return Result;
 }
-
-static bool tryAddingSymbolicOperand(int64_t Value, bool isBranch,
-                                     uint64_t Address, uint64_t Offset,
-                                     uint64_t Width, MCInst &MI,
-                                     const MCDisassembler *Decoder) {
-  return Decoder->tryAddingSymbolicOperand(MI, Value, Address, isBranch, Offset,
-                                           Width, /*InstSize=*/4);
-}
-
-static DecodeStatus DecodeCall(MCInst &MI, unsigned insn, uint64_t Address,
-                               const MCDisassembler *Decoder) {
-  int64_t CallOffset = SignExtend64(fieldFromInstruction(insn, 0, 30), 30) * 4;
-  if (!tryAddingSymbolicOperand(Address + CallOffset, false, Address, 0, 30, MI,
-                                Decoder))
-    MI.addOperand(MCOperand::createImm(CallOffset));
-  return MCDisassembler::Success;
-}
-
-static DecodeStatus DecodeSIMM5(MCInst &MI, unsigned insn, uint64_t Address,
-                                const MCDisassembler *Decoder) {
-  assert(isUInt<5>(insn));
-  MI.addOperand(MCOperand::createImm(SignExtend64<5>(insn)));
-  return MCDisassembler::Success;
-}
-
-static DecodeStatus DecodeSIMM13(MCInst &MI, unsigned insn, uint64_t Address,
-                                 const MCDisassembler *Decoder) {
-  assert(isUInt<13>(insn));
-  MI.addOperand(MCOperand::createImm(SignExtend64<13>(insn)));
-  return MCDisassembler::Success;
-}
-
-template <unsigned N>
-constexpr static DecodeStatus DecodeDisp(MCInst &MI, uint32_t ImmVal,
-                                         uint64_t Address,
-                                         const MCDisassembler *Decoder) {
-  int64_t BranchOffset = SignExtend64(ImmVal, N) * 4;
-  if (!tryAddingSymbolicOperand(Address + BranchOffset, true, Address, 0, N, MI,
-                                Decoder))
-    MI.addOperand(MCOperand::createImm(BranchOffset));
-  return MCDisassembler::Success;
-}