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96de8c778b
DWARF specifies that "line 0" really means "no appropriate source location" in the line table. Use this for branch targets and some other cases that have no specified source location, to prevent inheriting unfortunate line numbers from physically preceding instructions (which might be from completely unrelated source). Differential Revision: http://reviews.llvm.org/D24180 llvm-svn: 288212
112 lines
3.8 KiB
C++
112 lines
3.8 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/CodeGen/LexicalScopes.h"
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#include "llvm/CodeGen/MachineInstr.h"
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namespace llvm {
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class AsmPrinter;
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class MachineModuleInfo;
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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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// 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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/// Determine the relative position of the pieces described by P1 and P2.
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/// Returns -1 if P1 is entirely before P2, 0 if P1 and P2 overlap,
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/// 1 if P1 is entirely after P2.
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static int pieceCmp(const DIExpression *P1, const DIExpression *P2);
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/// Determine whether two variable pieces overlap.
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static bool piecesOverlap(const DIExpression *P1, const DIExpression *P2);
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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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