4af73d7ebb
The existing behaviors and callbacks were overlapping and had very confusing semantics: beginBasicBlock/endBasicBlock were not always called, beginFragment/endFragment seemed like they were meant to mean the same thing, but were slightly different, etc. This resulted in confusing semantics, virtual method overloads, and control flow. Remove the above, and replace with new beginBasicBlockSection and endBasicBlockSection callbacks. And document them. These are always called before the first and after the last blocks in a function, even when basic-block-sections are disabled.
108 lines
3.6 KiB
C++
108 lines
3.6 KiB
C++
//===-- DwarfException.h - Dwarf Exception Framework -----------*- 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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//
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// This file contains support for writing dwarf exception info into asm files.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DWARFEXCEPTION_H
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#define LLVM_LIB_CODEGEN_ASMPRINTER_DWARFEXCEPTION_H
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#include "EHStreamer.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/MC/MCDwarf.h"
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namespace llvm {
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class MachineFunction;
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class ARMTargetStreamer;
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class LLVM_LIBRARY_VISIBILITY DwarfCFIExceptionBase : public EHStreamer {
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protected:
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DwarfCFIExceptionBase(AsmPrinter *A);
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/// Per-function flag to indicate if frame CFI info should be emitted.
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bool shouldEmitCFI = false;
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/// Per-module flag to indicate if .cfi_section has beeen emitted.
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bool hasEmittedCFISections = false;
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void markFunctionEnd() override;
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};
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class LLVM_LIBRARY_VISIBILITY DwarfCFIException : public DwarfCFIExceptionBase {
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/// Per-function flag to indicate if .cfi_personality should be emitted.
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bool shouldEmitPersonality = false;
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/// Per-function flag to indicate if .cfi_personality must be emitted.
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bool forceEmitPersonality = false;
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/// Per-function flag to indicate if .cfi_lsda should be emitted.
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bool shouldEmitLSDA = false;
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public:
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//===--------------------------------------------------------------------===//
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// Main entry points.
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//
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DwarfCFIException(AsmPrinter *A);
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~DwarfCFIException() override;
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/// Emit all exception information that should come after the content.
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void endModule() override;
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/// Gather pre-function exception information. Assumes being emitted
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/// immediately after the function entry point.
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void beginFunction(const MachineFunction *MF) override;
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/// Gather and emit post-function exception information.
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void endFunction(const MachineFunction *) override;
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void beginBasicBlockSection(const MachineBasicBlock &MBB) override;
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void endBasicBlockSection(const MachineBasicBlock &MBB) override;
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};
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class LLVM_LIBRARY_VISIBILITY ARMException : public DwarfCFIExceptionBase {
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void emitTypeInfos(unsigned TTypeEncoding, MCSymbol *TTBaseLabel) override;
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ARMTargetStreamer &getTargetStreamer();
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public:
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//===--------------------------------------------------------------------===//
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// Main entry points.
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//
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ARMException(AsmPrinter *A);
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~ARMException() override;
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/// Emit all exception information that should come after the content.
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void endModule() override {}
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/// Gather pre-function exception information. Assumes being emitted
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/// immediately after the function entry point.
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void beginFunction(const MachineFunction *MF) override;
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/// Gather and emit post-function exception information.
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void endFunction(const MachineFunction *) override;
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void markFunctionEnd() override;
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};
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class LLVM_LIBRARY_VISIBILITY AIXException : public DwarfCFIExceptionBase {
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/// This is AIX's compat unwind section, which unwinder would use
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/// to find the location of LSDA area and personality rountine.
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void emitExceptionInfoTable(const MCSymbol *LSDA, const MCSymbol *PerSym);
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public:
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AIXException(AsmPrinter *A);
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void markFunctionEnd() override;
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void endModule() override {}
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void beginFunction(const MachineFunction *MF) override {}
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void endFunction(const MachineFunction *MF) override;
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};
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} // End of namespace llvm
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#endif
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