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0c6ca50b9c
Commit e4507fb8c94b ("bpf: disable DwarfUsesRelocationsAcrossSections")
disables MCAsmInfo DwarfUsesRelocationsAcrossSections unconditionally
so that dwarf will not use cross section (between dwarf and symbol table)
relocations. This new debug format enables pahole to dump structures
correctly as libdwarves.so does not have BPF backend support yet.
This new debug format, however, breaks bcc (https://github.com/iovisor/bcc)
source debug output as llvm in-memory Dwarf support has some issues to
handle it. More specifically, with DwarfUsesRelocationsAcrossSections
disabled, JIT compiler does not generate .debug_abbrev and Dwarf
DIE (debug info entry) processing is not happy about this.
This patch introduces a new flag -mattr=dwarfris
(dwarf relocation in section) to disable DwarfUsesRelocationsAcrossSections.
DwarfUsesRelocationsAcrossSections is true by default.
Signed-off-by: Yonghong Song <yhs@fb.com>
llvm-svn: 326505
88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
//===-- BPFSubtarget.h - Define Subtarget for the BPF -----------*- 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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// This file declares the BPF specific subclass of TargetSubtargetInfo.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_BPF_BPFSUBTARGET_H
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#define LLVM_LIB_TARGET_BPF_BPFSUBTARGET_H
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#include "BPFFrameLowering.h"
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#include "BPFISelLowering.h"
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#include "BPFInstrInfo.h"
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#include "llvm/CodeGen/SelectionDAGTargetInfo.h"
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#include "llvm/CodeGen/TargetSubtargetInfo.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/Target/TargetMachine.h"
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#define GET_SUBTARGETINFO_HEADER
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#include "BPFGenSubtargetInfo.inc"
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namespace llvm {
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class StringRef;
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class BPFSubtarget : public BPFGenSubtargetInfo {
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virtual void anchor();
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BPFInstrInfo InstrInfo;
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BPFFrameLowering FrameLowering;
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BPFTargetLowering TLInfo;
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SelectionDAGTargetInfo TSInfo;
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private:
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void initializeEnvironment();
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void initSubtargetFeatures(StringRef CPU, StringRef FS);
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bool probeJmpExt();
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protected:
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// unused
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bool isDummyMode;
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// whether the cpu supports jmp ext
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bool HasJmpExt;
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// whether the cpu supports alu32 instructions.
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bool HasAlu32;
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// whether we should enable MCAsmInfo DwarfUsesRelocationsAcrossSections
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bool UseDwarfRIS;
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public:
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// This constructor initializes the data members to match that
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// of the specified triple.
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BPFSubtarget(const Triple &TT, const std::string &CPU, const std::string &FS,
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const TargetMachine &TM);
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BPFSubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS);
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// ParseSubtargetFeatures - Parses features string setting specified
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// subtarget options. Definition of function is auto generated by tblgen.
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void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
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bool getHasJmpExt() const { return HasJmpExt; }
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bool getHasAlu32() const { return HasAlu32; }
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bool getUseDwarfRIS() const { return UseDwarfRIS; }
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const BPFInstrInfo *getInstrInfo() const override { return &InstrInfo; }
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const BPFFrameLowering *getFrameLowering() const override {
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return &FrameLowering;
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}
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const BPFTargetLowering *getTargetLowering() const override {
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return &TLInfo;
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}
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const SelectionDAGTargetInfo *getSelectionDAGInfo() const override {
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return &TSInfo;
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}
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const TargetRegisterInfo *getRegisterInfo() const override {
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return &InstrInfo.getRegisterInfo();
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}
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};
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} // End llvm namespace
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#endif
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