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59d98289d5
This reverts commits r338390 and r338398, they were causing LSan failures on the ASan bot. llvm-svn: 338408
132 lines
4.5 KiB
C++
132 lines
4.5 KiB
C++
//===-- llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.h --------*- 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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// Common functionality for different debug information format backends.
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// LLVM currently supports DWARF and CodeView.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGHANDLERBASE_H
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#define LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGHANDLERBASE_H
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#include "AsmPrinterHandler.h"
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#include "DbgValueHistoryCalculator.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/CodeGen/LexicalScopes.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/IR/DebugInfoMetadata.h"
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namespace llvm {
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class AsmPrinter;
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class MachineInstr;
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class MachineModuleInfo;
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/// Represents the location at which a variable is stored.
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struct DbgVariableLocation {
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/// Base register.
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unsigned Register;
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/// Chain of offsetted loads necessary to load the value if it lives in
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/// memory. Every load except for the last is pointer-sized.
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SmallVector<int64_t, 1> LoadChain;
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/// Present if the location is part of a larger variable.
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llvm::Optional<llvm::DIExpression::FragmentInfo> FragmentInfo;
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/// Extract a VariableLocation from a MachineInstr.
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/// This will only work if Instruction is a debug value instruction
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/// and the associated DIExpression is in one of the supported forms.
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/// If these requirements are not met, the returned Optional will not
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/// have a value.
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static Optional<DbgVariableLocation>
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extractFromMachineInstruction(const MachineInstr &Instruction);
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};
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/// Base class for debug information backends. Common functionality related to
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/// tracking which variables and scopes are alive at a given PC live here.
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class DebugHandlerBase : public AsmPrinterHandler {
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protected:
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DebugHandlerBase(AsmPrinter *A);
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/// Target of debug info emission.
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AsmPrinter *Asm;
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/// Collected machine module information.
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MachineModuleInfo *MMI;
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/// Previous instruction's location information. This is used to
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/// determine label location to indicate scope boundaries in debug info.
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/// We track the previous instruction's source location (if not line 0),
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/// whether it was a label, and its parent BB.
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DebugLoc PrevInstLoc;
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MCSymbol *PrevLabel = nullptr;
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const MachineBasicBlock *PrevInstBB = nullptr;
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/// This location indicates end of function prologue and beginning of
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/// function body.
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DebugLoc PrologEndLoc;
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/// If nonnull, stores the current machine instruction we're processing.
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const MachineInstr *CurMI = nullptr;
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LexicalScopes LScopes;
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/// History of DBG_VALUE and clobber instructions for each user
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/// variable. Variables are listed in order of appearance.
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DbgValueHistoryMap DbgValues;
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/// Maps instruction with label emitted before instruction.
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/// FIXME: Make this private from DwarfDebug, we have the necessary accessors
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/// for it.
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DenseMap<const MachineInstr *, MCSymbol *> LabelsBeforeInsn;
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/// Maps instruction with label emitted after instruction.
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DenseMap<const MachineInstr *, MCSymbol *> LabelsAfterInsn;
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/// Indentify instructions that are marking the beginning of or
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/// ending of a scope.
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void identifyScopeMarkers();
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/// Ensure that a label will be emitted before MI.
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void requestLabelBeforeInsn(const MachineInstr *MI) {
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LabelsBeforeInsn.insert(std::make_pair(MI, nullptr));
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}
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/// Ensure that a label will be emitted after MI.
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void requestLabelAfterInsn(const MachineInstr *MI) {
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LabelsAfterInsn.insert(std::make_pair(MI, nullptr));
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}
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virtual void beginFunctionImpl(const MachineFunction *MF) = 0;
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virtual void endFunctionImpl(const MachineFunction *MF) = 0;
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virtual void skippedNonDebugFunction() {}
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// AsmPrinterHandler overrides.
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public:
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void beginInstruction(const MachineInstr *MI) override;
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void endInstruction() 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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/// Return Label preceding the instruction.
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MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
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/// Return Label immediately following the instruction.
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MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
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/// If this type is derived from a base type then return base type size.
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static uint64_t getBaseTypeSize(const DITypeRef TyRef);
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};
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}
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#endif
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