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variables (for example, by-value struct arguments passed in registers, or large integer values split across several smaller registers). On the IR level, this adds a new type of complex address operation OpPiece to DIVariable that describes size and offset of a variable fragment. On the DWARF emitter level, all pieces describing the same variable are collected, sorted and emitted as DWARF expressions using the DW_OP_piece and DW_OP_bit_piece operators. http://reviews.llvm.org/D3373 rdar://problem/15928306 What this patch doesn't do / Future work: - This patch only adds the backend machinery to make this work, patches that change SROA and SelectionDAG's type legalizer to actually create such debug info will follow. (http://reviews.llvm.org/D2680) - Making the DIVariable complex expressions into an argument of dbg.value will reduce the memory footprint of the debug metadata. - The sorting/uniquing of pieces should be moved into DebugLocEntry, to facilitate the merging of multi-piece entries. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214576 91177308-0d34-0410-b5e6-96231b3b80d8
522 lines
20 KiB
C++
522 lines
20 KiB
C++
//===-- llvm/CodeGen/AsmPrinter.h - AsmPrinter Framework --------*- 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 contains a class to be used as the base class for target specific
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// asm writers. This class primarily handles common functionality used by
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// all asm writers.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_ASMPRINTER_H
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#define LLVM_CODEGEN_ASMPRINTER_H
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#include "llvm/ADT/Twine.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/IR/InlineAsm.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/ErrorHandling.h"
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namespace llvm {
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class AsmPrinterHandler;
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class BlockAddress;
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class ByteStreamer;
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class GCStrategy;
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class Constant;
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class ConstantArray;
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class GCMetadataPrinter;
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class GlobalValue;
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class GlobalVariable;
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class MachineBasicBlock;
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class MachineFunction;
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class MachineInstr;
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class MachineLocation;
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class MachineLoopInfo;
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class MachineLoop;
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class MachineConstantPoolValue;
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class MachineJumpTableInfo;
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class MachineModuleInfo;
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class MCAsmInfo;
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class MCCFIInstruction;
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class MCContext;
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class MCInst;
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class MCInstrInfo;
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class MCSection;
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class MCStreamer;
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class MCSubtargetInfo;
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class MCSymbol;
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class MDNode;
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class DwarfDebug;
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class Mangler;
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class TargetLoweringObjectFile;
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class DataLayout;
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class TargetMachine;
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/// This class is intended to be used as a driving class for all asm writers.
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class AsmPrinter : public MachineFunctionPass {
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public:
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/// Target machine description.
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///
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TargetMachine &TM;
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/// Target Asm Printer information.
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///
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const MCAsmInfo *MAI;
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const MCInstrInfo *MII;
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/// This is the context for the output file that we are streaming. This owns
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/// all of the global MC-related objects for the generated translation unit.
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MCContext &OutContext;
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/// This is the MCStreamer object for the file we are generating. This
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/// contains the transient state for the current translation unit that we are
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/// generating (such as the current section etc).
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MCStreamer &OutStreamer;
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/// The current machine function.
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const MachineFunction *MF;
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/// This is a pointer to the current MachineModuleInfo.
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MachineModuleInfo *MMI;
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/// Name-mangler for global names.
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///
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Mangler *Mang;
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/// The symbol for the current function. This is recalculated at the beginning
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/// of each call to runOnMachineFunction().
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///
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MCSymbol *CurrentFnSym;
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/// The symbol used to represent the start of the current function for the
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/// purpose of calculating its size (e.g. using the .size directive). By
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/// default, this is equal to CurrentFnSym.
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MCSymbol *CurrentFnSymForSize;
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private:
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// The garbage collection metadata printer table.
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void *GCMetadataPrinters; // Really a DenseMap.
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/// Emit comments in assembly output if this is true.
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///
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bool VerboseAsm;
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static char ID;
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/// If VerboseAsm is set, a pointer to the loop info for this function.
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MachineLoopInfo *LI;
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struct HandlerInfo {
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AsmPrinterHandler *Handler;
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const char *TimerName, *TimerGroupName;
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HandlerInfo(AsmPrinterHandler *Handler, const char *TimerName,
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const char *TimerGroupName)
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: Handler(Handler), TimerName(TimerName),
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TimerGroupName(TimerGroupName) {}
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};
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/// A vector of all debug/EH info emitters we should use. This vector
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/// maintains ownership of the emitters.
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SmallVector<HandlerInfo, 1> Handlers;
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/// If the target supports dwarf debug info, this pointer is non-null.
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DwarfDebug *DD;
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protected:
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explicit AsmPrinter(TargetMachine &TM, MCStreamer &Streamer);
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public:
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virtual ~AsmPrinter();
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DwarfDebug *getDwarfDebug() { return DD; }
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/// Return true if assembly output should contain comments.
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///
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bool isVerbose() const { return VerboseAsm; }
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/// Return a unique ID for the current function.
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///
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unsigned getFunctionNumber() const;
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/// Return information about object file lowering.
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const TargetLoweringObjectFile &getObjFileLowering() const;
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/// Return information about data layout.
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const DataLayout &getDataLayout() const;
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/// Return information about subtarget.
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const MCSubtargetInfo &getSubtargetInfo() const;
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void EmitToStreamer(MCStreamer &S, const MCInst &Inst);
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/// Return the target triple string.
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StringRef getTargetTriple() const;
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/// Return the current section we are emitting to.
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const MCSection *getCurrentSection() const;
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void getNameWithPrefix(SmallVectorImpl<char> &Name,
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const GlobalValue *GV) const;
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MCSymbol *getSymbol(const GlobalValue *GV) const;
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//===------------------------------------------------------------------===//
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// MachineFunctionPass Implementation.
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//===------------------------------------------------------------------===//
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/// Record analysis usage.
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///
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void getAnalysisUsage(AnalysisUsage &AU) const override;
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/// Set up the AsmPrinter when we are working on a new module. If your pass
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/// overrides this, it must make sure to explicitly call this implementation.
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bool doInitialization(Module &M) override;
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/// Shut down the asmprinter. If you override this in your pass, you must make
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/// sure to call it explicitly.
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bool doFinalization(Module &M) override;
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/// Emit the specified function out to the OutStreamer.
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bool runOnMachineFunction(MachineFunction &MF) override {
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SetupMachineFunction(MF);
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EmitFunctionHeader();
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EmitFunctionBody();
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return false;
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}
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//===------------------------------------------------------------------===//
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// Coarse grained IR lowering routines.
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//===------------------------------------------------------------------===//
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/// This should be called when a new MachineFunction is being processed from
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/// runOnMachineFunction.
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void SetupMachineFunction(MachineFunction &MF);
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/// This method emits the header for the current function.
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void EmitFunctionHeader();
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/// This method emits the body and trailer for a function.
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void EmitFunctionBody();
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void emitCFIInstruction(const MachineInstr &MI);
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enum CFIMoveType { CFI_M_None, CFI_M_EH, CFI_M_Debug };
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CFIMoveType needsCFIMoves();
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bool needsSEHMoves();
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/// Print to the current output stream assembly representations of the
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/// constants in the constant pool MCP. This is used to print out constants
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/// which have been "spilled to memory" by the code generator.
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///
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virtual void EmitConstantPool();
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/// Print assembly representations of the jump tables used by the current
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/// function to the current output stream.
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///
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void EmitJumpTableInfo();
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/// Emit the specified global variable to the .s file.
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virtual void EmitGlobalVariable(const GlobalVariable *GV);
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/// Check to see if the specified global is a special global used by LLVM. If
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/// so, emit it and return true, otherwise do nothing and return false.
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bool EmitSpecialLLVMGlobal(const GlobalVariable *GV);
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/// Emit an alignment directive to the specified power of two boundary. For
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/// example, if you pass in 3 here, you will get an 8 byte alignment. If a
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/// global value is specified, and if that global has an explicit alignment
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/// requested, it will override the alignment request if required for
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/// correctness.
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///
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void EmitAlignment(unsigned NumBits, const GlobalObject *GO = nullptr) const;
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/// This method prints the label for the specified MachineBasicBlock, an
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/// alignment (if present) and a comment describing it if appropriate.
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void EmitBasicBlockStart(const MachineBasicBlock &MBB) const;
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/// \brief Print a general LLVM constant to the .s file.
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void EmitGlobalConstant(const Constant *CV);
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//===------------------------------------------------------------------===//
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// Overridable Hooks
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//===------------------------------------------------------------------===//
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// Targets can, or in the case of EmitInstruction, must implement these to
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// customize output.
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/// This virtual method can be overridden by targets that want to emit
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/// something at the start of their file.
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virtual void EmitStartOfAsmFile(Module &) {}
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/// This virtual method can be overridden by targets that want to emit
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/// something at the end of their file.
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virtual void EmitEndOfAsmFile(Module &) {}
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/// Targets can override this to emit stuff before the first basic block in
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/// the function.
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virtual void EmitFunctionBodyStart() {}
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/// Targets can override this to emit stuff after the last basic block in the
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/// function.
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virtual void EmitFunctionBodyEnd() {}
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/// Targets can override this to emit stuff at the end of a basic block.
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virtual void EmitBasicBlockEnd(const MachineBasicBlock &MBB) {}
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/// Targets should implement this to emit instructions.
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virtual void EmitInstruction(const MachineInstr *) {
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llvm_unreachable("EmitInstruction not implemented");
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}
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/// Return the symbol for the specified constant pool entry.
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virtual MCSymbol *GetCPISymbol(unsigned CPID) const;
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virtual void EmitFunctionEntryLabel();
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virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV);
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/// Targets can override this to change how global constants that are part of
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/// a C++ static/global constructor list are emitted.
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virtual void EmitXXStructor(const Constant *CV) { EmitGlobalConstant(CV); }
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/// Return true if the basic block has exactly one predecessor and the control
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/// transfer mechanism between the predecessor and this block is a
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/// fall-through.
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virtual bool
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isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const;
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/// Targets can override this to customize the output of IMPLICIT_DEF
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/// instructions in verbose mode.
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virtual void emitImplicitDef(const MachineInstr *MI) const;
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//===------------------------------------------------------------------===//
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// Symbol Lowering Routines.
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//===------------------------------------------------------------------===//
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public:
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/// Return the MCSymbol corresponding to the assembler temporary label with
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/// the specified stem and unique ID.
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MCSymbol *GetTempSymbol(Twine Name, unsigned ID) const;
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/// Return an assembler temporary label with the specified stem.
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MCSymbol *GetTempSymbol(Twine Name) const;
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/// Return the MCSymbol for a private symbol with global value name as its
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/// base, with the specified suffix.
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MCSymbol *getSymbolWithGlobalValueBase(const GlobalValue *GV,
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StringRef Suffix) const;
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/// Return the MCSymbol for the specified ExternalSymbol.
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MCSymbol *GetExternalSymbolSymbol(StringRef Sym) const;
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/// Return the symbol for the specified jump table entry.
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MCSymbol *GetJTISymbol(unsigned JTID, bool isLinkerPrivate = false) const;
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/// Return the symbol for the specified jump table .set
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/// FIXME: privatize to AsmPrinter.
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MCSymbol *GetJTSetSymbol(unsigned UID, unsigned MBBID) const;
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/// Return the MCSymbol used to satisfy BlockAddress uses of the specified
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/// basic block.
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MCSymbol *GetBlockAddressSymbol(const BlockAddress *BA) const;
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MCSymbol *GetBlockAddressSymbol(const BasicBlock *BB) const;
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//===------------------------------------------------------------------===//
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// Emission Helper Routines.
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//===------------------------------------------------------------------===//
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public:
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/// This is just convenient handler for printing offsets.
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void printOffset(int64_t Offset, raw_ostream &OS) const;
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/// Emit a byte directive and value.
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///
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void EmitInt8(int Value) const;
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/// Emit a short directive and value.
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///
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void EmitInt16(int Value) const;
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/// Emit a long directive and value.
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///
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void EmitInt32(int Value) const;
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/// Emit something like ".long Hi-Lo" where the size in bytes of the directive
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/// is specified by Size and Hi/Lo specify the labels. This implicitly uses
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/// .set if it is available.
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void EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
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unsigned Size) const;
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/// Emit something like ".long Hi+Offset-Lo" where the size in bytes of the
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/// directive is specified by Size and Hi/Lo specify the labels. This
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/// implicitly uses .set if it is available.
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void EmitLabelOffsetDifference(const MCSymbol *Hi, uint64_t Offset,
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const MCSymbol *Lo, unsigned Size) const;
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/// Emit something like ".long Label+Offset" where the size in bytes of the
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/// directive is specified by Size and Label specifies the label. This
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/// implicitly uses .set if it is available.
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void EmitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset,
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unsigned Size, bool IsSectionRelative = false) const;
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/// Emit something like ".long Label" where the size in bytes of the directive
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/// is specified by Size and Label specifies the label.
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void EmitLabelReference(const MCSymbol *Label, unsigned Size,
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bool IsSectionRelative = false) const {
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EmitLabelPlusOffset(Label, 0, Size, IsSectionRelative);
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}
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//===------------------------------------------------------------------===//
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// Dwarf Emission Helper Routines
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//===------------------------------------------------------------------===//
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/// Emit the specified signed leb128 value.
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void EmitSLEB128(int64_t Value, const char *Desc = nullptr) const;
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/// Emit the specified unsigned leb128 value.
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void EmitULEB128(uint64_t Value, const char *Desc = nullptr,
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unsigned PadTo = 0) const;
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/// Emit a .byte 42 directive for a DW_CFA_xxx value.
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void EmitCFAByte(unsigned Val) const;
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/// Emit a .byte 42 directive that corresponds to an encoding. If verbose
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/// assembly output is enabled, we output comments describing the encoding.
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/// Desc is a string saying what the encoding is specifying (e.g. "LSDA").
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void EmitEncodingByte(unsigned Val, const char *Desc = nullptr) const;
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/// Return the size of the encoding in bytes.
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unsigned GetSizeOfEncodedValue(unsigned Encoding) const;
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/// Emit reference to a ttype global with a specified encoding.
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void EmitTTypeReference(const GlobalValue *GV, unsigned Encoding) const;
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/// Emit the 4-byte offset of Label from the start of its section. This can
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/// be done with a special directive if the target supports it (e.g. cygwin)
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/// or by emitting it as an offset from a label at the start of the section.
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///
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/// SectionLabel is a temporary label emitted at the start of the section
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/// that Label lives in.
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void EmitSectionOffset(const MCSymbol *Label,
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const MCSymbol *SectionLabel) const;
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/// Get the value for DW_AT_APPLE_isa. Zero if no isa encoding specified.
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virtual unsigned getISAEncoding() { return 0; }
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/// Emit a dwarf register operation for describing
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/// - a small value occupying only part of a register or
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/// - a register representing only part of a value.
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void EmitDwarfOpPiece(ByteStreamer &Streamer, unsigned SizeInBits,
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unsigned OffsetInBits = 0) const;
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/// \brief Emit a partial DWARF register operation.
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/// \param MLoc the register
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/// \param PieceSize size and
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/// \param PieceOffset offset of the piece in bits, if this is one
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/// piece of an aggregate value.
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///
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/// If size and offset is zero an operation for the entire
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/// register is emitted: Some targets do not provide a DWARF
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/// register number for every register. If this is the case, this
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/// function will attempt to emit a DWARF register by emitting a
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/// piece of a super-register or by piecing together multiple
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/// subregisters that alias the register.
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void EmitDwarfRegOpPiece(ByteStreamer &BS, const MachineLocation &MLoc,
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unsigned PieceSize = 0,
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unsigned PieceOffset = 0) const;
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/// EmitDwarfRegOp - Emit a dwarf register operation.
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/// \param Indirect whether this is a register-indirect address
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virtual void EmitDwarfRegOp(ByteStreamer &BS, const MachineLocation &MLoc,
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bool Indirect) const;
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//===------------------------------------------------------------------===//
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// Dwarf Lowering Routines
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//===------------------------------------------------------------------===//
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/// \brief Emit frame instruction to describe the layout of the frame.
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void emitCFIInstruction(const MCCFIInstruction &Inst) const;
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//===------------------------------------------------------------------===//
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// Inline Asm Support
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//===------------------------------------------------------------------===//
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public:
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// These are hooks that targets can override to implement inline asm
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// support. These should probably be moved out of AsmPrinter someday.
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/// Print information related to the specified machine instr that is
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/// independent of the operand, and may be independent of the instr itself.
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/// This can be useful for portably encoding the comment character or other
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/// bits of target-specific knowledge into the asmstrings. The syntax used is
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/// ${:comment}. Targets can override this to add support for their own
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/// strange codes.
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virtual void PrintSpecial(const MachineInstr *MI, raw_ostream &OS,
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const char *Code) const;
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/// Print the specified operand of MI, an INLINEASM instruction, using the
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/// specified assembler variant. Targets should override this to format as
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/// appropriate. This method can return true if the operand is erroneous.
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virtual bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant, const char *ExtraCode,
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raw_ostream &OS);
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/// Print the specified operand of MI, an INLINEASM instruction, using the
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/// specified assembler variant as an address. Targets should override this to
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/// format as appropriate. This method can return true if the operand is
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/// erroneous.
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virtual bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant, const char *ExtraCode,
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raw_ostream &OS);
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/// Let the target do anything it needs to do after emitting inlineasm.
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/// This callback can be used restore the original mode in case the
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/// inlineasm contains directives to switch modes.
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/// \p StartInfo - the original subtarget info before inline asm
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/// \p EndInfo - the final subtarget info after parsing the inline asm,
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/// or NULL if the value is unknown.
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virtual void emitInlineAsmEnd(const MCSubtargetInfo &StartInfo,
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const MCSubtargetInfo *EndInfo) const;
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private:
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/// Private state for PrintSpecial()
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// Assign a unique ID to this machine instruction.
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mutable const MachineInstr *LastMI;
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mutable unsigned LastFn;
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mutable unsigned Counter;
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mutable unsigned SetCounter;
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/// Emit a blob of inline asm to the output streamer.
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void
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EmitInlineAsm(StringRef Str, const MDNode *LocMDNode = nullptr,
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InlineAsm::AsmDialect AsmDialect = InlineAsm::AD_ATT) const;
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/// This method formats and emits the specified machine instruction that is an
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/// inline asm.
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void EmitInlineAsm(const MachineInstr *MI) const;
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//===------------------------------------------------------------------===//
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// Internal Implementation Details
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//===------------------------------------------------------------------===//
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/// This emits visibility information about symbol, if this is suported by the
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/// target.
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void EmitVisibility(MCSymbol *Sym, unsigned Visibility,
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bool IsDefinition = true) const;
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void EmitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const;
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void EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
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const MachineBasicBlock *MBB, unsigned uid) const;
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void EmitLLVMUsedList(const ConstantArray *InitList);
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/// Emit llvm.ident metadata in an '.ident' directive.
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void EmitModuleIdents(Module &M);
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void EmitXXStructorList(const Constant *List, bool isCtor);
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GCMetadataPrinter *GetOrCreateGCPrinter(GCStrategy &C);
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};
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}
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#endif
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