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94 lines
2.9 KiB
C++
94 lines
2.9 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 was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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 "llvm/Target/TargetFrameInfo.h"
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#include "llvm/Target/TargetMachine.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 isMacho) {
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if (isMacho)
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return LP64 ? 16 : 8;
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// For ELF 32 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 isMacho) {
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// For MachO 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 (isMacho)
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return LP64 ? 40 : 20;
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// For ELF 32 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 isMacho) {
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if (isMacho)
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return 6 * (LP64 ? 8 : 4);
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// For ELF 32 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 isMacho) {
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// For Macho 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 (isMacho)
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return 8 * (LP64 ? 8 : 4);
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// For ELF 32 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 isMacho) {
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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, isMacho) +
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getMinCallArgumentsSize(LP64, isMacho);
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}
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};
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} // End llvm namespace
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#endif
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