llvm-project/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.h

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//===-- llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.h --------*- C++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Common functionality for different debug information format backends.
// LLVM currently supports DWARF and CodeView.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGHANDLERBASE_H
#define LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGHANDLERBASE_H
#include "AsmPrinterHandler.h"
#include "DbgValueHistoryCalculator.h"
#include "llvm/CodeGen/LexicalScopes.h"
#include "llvm/CodeGen/MachineInstr.h"
namespace llvm {
class AsmPrinter;
class MachineModuleInfo;
/// Base class for debug information backends. Common functionality related to
/// tracking which variables and scopes are alive at a given PC live here.
class DebugHandlerBase : public AsmPrinterHandler {
protected:
DebugHandlerBase(AsmPrinter *A);
/// Target of debug info emission.
AsmPrinter *Asm;
/// Collected machine module information.
MachineModuleInfo *MMI;
/// Previous instruction's location information. This is used to
/// determine label location to indicate scope boundries in dwarf
/// debug info.
DebugLoc PrevInstLoc;
MCSymbol *PrevLabel = nullptr;
/// This location indicates end of function prologue and beginning of
/// function body.
DebugLoc PrologEndLoc;
/// If nonnull, stores the current machine instruction we're processing.
const MachineInstr *CurMI = nullptr;
LexicalScopes LScopes;
/// History of DBG_VALUE and clobber instructions for each user
/// variable. Variables are listed in order of appearance.
DbgValueHistoryMap DbgValues;
/// Maps instruction with label emitted before instruction.
/// FIXME: Make this private from DwarfDebug, we have the necessary accessors
/// for it.
DenseMap<const MachineInstr *, MCSymbol *> LabelsBeforeInsn;
/// Maps instruction with label emitted after instruction.
DenseMap<const MachineInstr *, MCSymbol *> LabelsAfterInsn;
/// Indentify instructions that are marking the beginning of or
/// ending of a scope.
void identifyScopeMarkers();
/// Ensure that a label will be emitted before MI.
void requestLabelBeforeInsn(const MachineInstr *MI) {
LabelsBeforeInsn.insert(std::make_pair(MI, nullptr));
}
/// Ensure that a label will be emitted after MI.
void requestLabelAfterInsn(const MachineInstr *MI) {
LabelsAfterInsn.insert(std::make_pair(MI, nullptr));
}
// AsmPrinterHandler overrides.
public:
void beginInstruction(const MachineInstr *MI) override;
void endInstruction() override;
void beginFunction(const MachineFunction *MF) override;
void endFunction(const MachineFunction *MF) override;
/// Return Label preceding the instruction.
MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
/// Return Label immediately following the instruction.
MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
/// Determine the relative position of the pieces described by P1 and P2.
/// Returns -1 if P1 is entirely before P2, 0 if P1 and P2 overlap,
/// 1 if P1 is entirely after P2.
static int pieceCmp(const DIExpression *P1, const DIExpression *P2);
/// Determine whether two variable pieces overlap.
static bool piecesOverlap(const DIExpression *P1, const DIExpression *P2);
};
}
#endif