mirror of
https://github.com/c64scene-ar/llvm-6502.git
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2a9ddfb903
Make CalculateParameterAndLinkageAreaSize() Darwin-specific. Remove SVR4 specific code from LowerCALL_Darwin() and LowerFORMAL_ARGUMENTS_Darwin(). Rename MachoABI to DarwinABI for consistency. Rename ELF ABI to SVR4 ABI for consistency. Factor out common call return lowering between the Darwin and SVR4 ABI. Factor out common call lowering between the Darwin and SVR4 ABI. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74766 91177308-0d34-0410-b5e6-96231b3b80d8
185 lines
6.6 KiB
C++
185 lines
6.6 KiB
C++
//===-- PPCFrameInfo.h - Define TargetFrameInfo for PowerPC -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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//
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//===----------------------------------------------------------------------===//
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#ifndef POWERPC_FRAMEINFO_H
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#define POWERPC_FRAMEINFO_H
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#include "PPC.h"
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#include "PPCSubtarget.h"
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#include "llvm/Target/TargetFrameInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/ADT/STLExtras.h"
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namespace llvm {
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class PPCFrameInfo: public TargetFrameInfo {
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const TargetMachine &TM;
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public:
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PPCFrameInfo(const TargetMachine &tm, bool LP64)
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: TargetFrameInfo(TargetFrameInfo::StackGrowsDown, 16, 0), TM(tm) {
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}
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/// getReturnSaveOffset - Return the previous frame offset to save the
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/// return address.
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static unsigned getReturnSaveOffset(bool LP64, bool isDarwinABI) {
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if (isDarwinABI)
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return LP64 ? 16 : 8;
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// SVR4 ABI:
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return 4;
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}
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/// getFramePointerSaveOffset - Return the previous frame offset to save the
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/// frame pointer.
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static unsigned getFramePointerSaveOffset(bool LP64, bool isDarwinABI) {
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// For the Darwin ABI:
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// Use the TOC save slot in the PowerPC linkage area for saving the frame
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// pointer (if needed.) LLVM does not generate code that uses the TOC (R2
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// is treated as a caller saved register.)
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if (isDarwinABI)
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return LP64 ? 40 : 20;
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// SVR4 ABI:
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// Save it right before the link register
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return -4U;
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}
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/// getLinkageSize - Return the size of the PowerPC ABI linkage area.
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///
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static unsigned getLinkageSize(bool LP64, bool isDarwinABI) {
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if (isDarwinABI)
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return 6 * (LP64 ? 8 : 4);
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// SVR4 ABI:
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return 8;
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}
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/// getMinCallArgumentsSize - Return the size of the minium PowerPC ABI
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/// argument area.
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static unsigned getMinCallArgumentsSize(bool LP64, bool isDarwinABI) {
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// For the Darwin ABI:
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// The prolog code of the callee may store up to 8 GPR argument registers to
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// the stack, allowing va_start to index over them in memory if its varargs.
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// Because we cannot tell if this is needed on the caller side, we have to
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// conservatively assume that it is needed. As such, make sure we have at
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// least enough stack space for the caller to store the 8 GPRs.
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if (isDarwinABI)
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return 8 * (LP64 ? 8 : 4);
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// SVR4 ABI:
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// There is no default stack allocated for the 8 first GPR arguments.
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return 0;
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}
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/// getMinCallFrameSize - Return the minimum size a call frame can be using
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/// the PowerPC ABI.
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static unsigned getMinCallFrameSize(bool LP64, bool isDarwinABI) {
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// The call frame needs to be at least big enough for linkage and 8 args.
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return getLinkageSize(LP64, isDarwinABI) +
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getMinCallArgumentsSize(LP64, isDarwinABI);
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}
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// With the SVR4 ABI, callee-saved registers have fixed offsets on the stack.
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const std::pair<unsigned, int> *
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getCalleeSavedSpillSlots(unsigned &NumEntries) const {
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// Early exit if not using the SVR4 ABI.
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if (!TM.getSubtarget<PPCSubtarget>().isSVR4ABI()) {
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NumEntries = 0;
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return 0;
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}
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static const std::pair<unsigned, int> Offsets[] = {
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// Floating-point register save area offsets.
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std::pair<unsigned, int>(PPC::F31, -8),
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std::pair<unsigned, int>(PPC::F30, -16),
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std::pair<unsigned, int>(PPC::F29, -24),
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std::pair<unsigned, int>(PPC::F28, -32),
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std::pair<unsigned, int>(PPC::F27, -40),
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std::pair<unsigned, int>(PPC::F26, -48),
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std::pair<unsigned, int>(PPC::F25, -56),
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std::pair<unsigned, int>(PPC::F24, -64),
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std::pair<unsigned, int>(PPC::F23, -72),
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std::pair<unsigned, int>(PPC::F22, -80),
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std::pair<unsigned, int>(PPC::F21, -88),
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std::pair<unsigned, int>(PPC::F20, -96),
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std::pair<unsigned, int>(PPC::F19, -104),
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std::pair<unsigned, int>(PPC::F18, -112),
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std::pair<unsigned, int>(PPC::F17, -120),
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std::pair<unsigned, int>(PPC::F16, -128),
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std::pair<unsigned, int>(PPC::F15, -136),
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std::pair<unsigned, int>(PPC::F14, -144),
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// General register save area offsets.
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std::pair<unsigned, int>(PPC::R31, -4),
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std::pair<unsigned, int>(PPC::R30, -8),
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std::pair<unsigned, int>(PPC::R29, -12),
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std::pair<unsigned, int>(PPC::R28, -16),
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std::pair<unsigned, int>(PPC::R27, -20),
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std::pair<unsigned, int>(PPC::R26, -24),
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std::pair<unsigned, int>(PPC::R25, -28),
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std::pair<unsigned, int>(PPC::R24, -32),
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std::pair<unsigned, int>(PPC::R23, -36),
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std::pair<unsigned, int>(PPC::R22, -40),
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std::pair<unsigned, int>(PPC::R21, -44),
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std::pair<unsigned, int>(PPC::R20, -48),
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std::pair<unsigned, int>(PPC::R19, -52),
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std::pair<unsigned, int>(PPC::R18, -56),
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std::pair<unsigned, int>(PPC::R17, -60),
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std::pair<unsigned, int>(PPC::R16, -64),
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std::pair<unsigned, int>(PPC::R15, -68),
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std::pair<unsigned, int>(PPC::R14, -72),
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// CR save area offset.
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std::pair<unsigned, int>(PPC::CR2, -4),
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std::pair<unsigned, int>(PPC::CR3, -4),
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std::pair<unsigned, int>(PPC::CR4, -4),
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std::pair<unsigned, int>(PPC::CR2LT, -4),
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std::pair<unsigned, int>(PPC::CR2GT, -4),
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std::pair<unsigned, int>(PPC::CR2EQ, -4),
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std::pair<unsigned, int>(PPC::CR2UN, -4),
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std::pair<unsigned, int>(PPC::CR3LT, -4),
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std::pair<unsigned, int>(PPC::CR3GT, -4),
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std::pair<unsigned, int>(PPC::CR3EQ, -4),
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std::pair<unsigned, int>(PPC::CR3UN, -4),
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std::pair<unsigned, int>(PPC::CR4LT, -4),
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std::pair<unsigned, int>(PPC::CR4GT, -4),
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std::pair<unsigned, int>(PPC::CR4EQ, -4),
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std::pair<unsigned, int>(PPC::CR4UN, -4),
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// VRSAVE save area offset.
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std::pair<unsigned, int>(PPC::VRSAVE, -4),
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// Vector register save area
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std::pair<unsigned, int>(PPC::V31, -16),
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std::pair<unsigned, int>(PPC::V30, -32),
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std::pair<unsigned, int>(PPC::V29, -48),
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std::pair<unsigned, int>(PPC::V28, -64),
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std::pair<unsigned, int>(PPC::V27, -80),
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std::pair<unsigned, int>(PPC::V26, -96),
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std::pair<unsigned, int>(PPC::V25, -112),
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std::pair<unsigned, int>(PPC::V24, -128),
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std::pair<unsigned, int>(PPC::V23, -144),
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std::pair<unsigned, int>(PPC::V22, -160),
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std::pair<unsigned, int>(PPC::V21, -176),
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std::pair<unsigned, int>(PPC::V20, -192)
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};
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NumEntries = array_lengthof(Offsets);
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return Offsets;
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}
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};
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} // End llvm namespace
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#endif
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