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d4257fbbba
Fix a couple minor details in the existing logic for calculating saved registers and stack adjustment. Synthesize the corresponding prologues and epilogues and print them. (This supersedes the previous printout of one single list of stored registers; as there's lots of minor nuance differences in how registers are pushed/popped in various corner cases, it's better to print the full prologue/epilogue instead of trying to condense it into one single list.) Print the raw values of the fields Reg, R, L (LinkRegister) and C (Chaining) instead of only printing the derived values. Differential Revision: https://reviews.llvm.org/D125644
50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
//===-- ARMWinEH.cpp - Windows on ARM EH Support Functions ------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/ARMWinEH.h"
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namespace llvm {
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namespace ARM {
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namespace WinEH {
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std::pair<uint16_t, uint32_t> SavedRegisterMask(const RuntimeFunction &RF,
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bool Prologue) {
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uint8_t NumRegisters = RF.Reg();
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uint8_t RegistersVFP = RF.R();
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uint8_t LinkRegister = RF.L();
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uint8_t ChainedFrame = RF.C();
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uint16_t GPRMask = (ChainedFrame << 11);
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uint32_t VFPMask = 0;
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if (Prologue) {
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GPRMask |= (LinkRegister << 14);
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} else {
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// If Ret != 0, we pop into Lr and return later
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if (RF.Ret() != ReturnType::RT_POP)
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GPRMask |= (LinkRegister << 14);
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else if (!RF.H()) // If H == 0, we pop directly into Pc
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GPRMask |= (LinkRegister << 15);
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// else, Ret == 0 && H == 1, we pop into Pc separately afterwards
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}
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if (RegistersVFP)
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VFPMask |= (((1 << ((NumRegisters + 1) % 8)) - 1) << 8);
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else
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GPRMask |= (((1 << (NumRegisters + 1)) - 1) << 4);
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if ((PrologueFolding(RF) && Prologue) || (EpilogueFolding(RF) && !Prologue))
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GPRMask |= (((1 << ((RF.StackAdjust() & 0x3) + 1)) - 1)
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<< (~RF.StackAdjust() & 0x3));
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return std::make_pair(GPRMask, VFPMask);
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}
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} // namespace WinEH
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} // namespace ARM
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} // namespace llvm
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