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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40854 91177308-0d34-0410-b5e6-96231b3b80d8
320 lines
13 KiB
C++
320 lines
13 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 was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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/CodeGen/MachineFunctionPass.h"
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#include "llvm/Support/DataTypes.h"
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#include <set>
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namespace llvm {
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class Constant;
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class ConstantArray;
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class GlobalVariable;
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class GlobalAlias;
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class MachineConstantPoolEntry;
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class MachineConstantPoolValue;
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class Mangler;
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class TargetAsmInfo;
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/// AsmPrinter - This class is intended to be used as a driving class for all
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/// asm writers.
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class AsmPrinter : public MachineFunctionPass {
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static char ID;
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/// FunctionNumber - This provides a unique ID for each function emitted in
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/// this translation unit. It is autoincremented by SetupMachineFunction,
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/// and can be accessed with getFunctionNumber() and
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/// IncrementFunctionNumber().
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///
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unsigned FunctionNumber;
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protected:
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// Necessary for external weak linkage support
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std::set<const GlobalValue*> ExtWeakSymbols;
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public:
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/// Output stream on which we're printing assembly code.
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///
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std::ostream &O;
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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 TargetAsmInfo *TAI;
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/// Name-mangler for global names.
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///
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Mangler *Mang;
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/// Cache of mangled name for current function. This is recalculated at the
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/// beginning of each call to runOnMachineFunction().
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///
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std::string CurrentFnName;
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/// CurrentSection - The current section we are emitting to. This is
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/// controlled and used by the SwitchSection method.
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std::string CurrentSection;
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protected:
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AsmPrinter(std::ostream &o, TargetMachine &TM, const TargetAsmInfo *T);
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public:
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/// SwitchToTextSection - Switch to the specified section of the executable
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/// if we are not already in it! If GV is non-null and if the global has an
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/// explicitly requested section, we switch to the section indicated for the
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/// global instead of NewSection.
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///
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/// If the new section is an empty string, this method forgets what the
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/// current section is, but does not emit a .section directive.
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///
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/// This method is used when about to emit executable code.
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///
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void SwitchToTextSection(const char *NewSection, const GlobalValue *GV = NULL);
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/// SwitchToDataSection - Switch to the specified section of the executable
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/// if we are not already in it! If GV is non-null and if the global has an
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/// explicitly requested section, we switch to the section indicated for the
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/// global instead of NewSection.
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///
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/// If the new section is an empty string, this method forgets what the
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/// current section is, but does not emit a .section directive.
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///
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/// This method is used when about to emit data. For most assemblers, this
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/// is the same as the SwitchToTextSection method, but not all assemblers
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/// are the same.
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///
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void SwitchToDataSection(const char *NewSection, const GlobalValue *GV = NULL);
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/// getGlobalLinkName - Returns the asm/link name of of the specified
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/// global variable. Should be overridden by each target asm printer to
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/// generate the appropriate value.
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virtual const std::string getGlobalLinkName(const GlobalVariable *GV) const;
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/// EmitExternalGlobal - Emit the external reference to a global variable.
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/// Should be overridden if an indirect reference should be used.
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virtual void EmitExternalGlobal(const GlobalVariable *GV);
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protected:
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/// doInitialization - Set up the AsmPrinter when we are working on a new
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/// module. If your pass overrides this, it must make sure to explicitly
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/// call this implementation.
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bool doInitialization(Module &M);
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/// doFinalization - Shut down the asmprinter. If you override this in your
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/// pass, you must make sure to call it explicitly.
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bool doFinalization(Module &M);
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/// PrintSpecial - Print information related to the specified machine instr
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/// that is independent of the operand, and may be independent of the instr
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/// itself. This can be useful for portably encoding the comment character
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/// or other bits of target-specific knowledge into the asmstrings. The
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/// syntax used is ${:comment}. Targets can override this to add support
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/// for their own strange codes.
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virtual void PrintSpecial(const MachineInstr *MI, const char *Code);
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/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
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/// instruction, using the specified assembler variant. Targets should
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/// override this to format as appropriate. This method can return true if
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/// 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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/// PrintAsmMemoryOperand - Print the specified operand of MI, an INLINEASM
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/// instruction, using the specified assembler variant as an address.
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/// Targets should override this to format as appropriate. This method can
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/// return true if the operand is erroneous.
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virtual bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant,
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const char *ExtraCode);
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/// getSectionForFunction - Return the section that we should emit the
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/// specified function body into. This defaults to 'TextSection'. This
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/// should most likely be overridden by the target to put linkonce/weak
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/// functions into special sections.
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virtual std::string getSectionForFunction(const Function &F) const;
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/// SetupMachineFunction - This should be called when a new MachineFunction
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/// is being processed from runOnMachineFunction.
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void SetupMachineFunction(MachineFunction &MF);
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/// getFunctionNumber - Return a unique ID for the current function.
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///
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unsigned getFunctionNumber() const { return FunctionNumber; }
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/// IncrementFunctionNumber - Increase Function Number. AsmPrinters should
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/// not normally call this, as the counter is automatically bumped by
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/// SetupMachineFunction.
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void IncrementFunctionNumber() { FunctionNumber++; }
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/// EmitConstantPool - Print to the current output stream assembly
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/// representations of the constants in the constant pool MCP. This is
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/// used to print out constants which have been "spilled to memory" by
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/// the code generator.
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///
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void EmitConstantPool(MachineConstantPool *MCP);
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/// EmitJumpTableInfo - Print assembly representations of the jump tables
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/// used by the current function to the current output stream.
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///
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void EmitJumpTableInfo(MachineJumpTableInfo *MJTI, MachineFunction &MF);
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/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
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/// special global used by LLVM. If so, emit it and return true, otherwise
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/// do nothing and return false.
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bool EmitSpecialLLVMGlobal(const GlobalVariable *GV);
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public:
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//===------------------------------------------------------------------===//
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/// LEB 128 number encoding.
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/// PrintULEB128 - Print a series of hexidecimal values(separated by commas)
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/// representing an unsigned leb128 value.
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void PrintULEB128(unsigned Value) const;
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/// SizeULEB128 - Compute the number of bytes required for an unsigned
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/// leb128 value.
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static unsigned SizeULEB128(unsigned Value);
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/// PrintSLEB128 - Print a series of hexidecimal values(separated by commas)
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/// representing a signed leb128 value.
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void PrintSLEB128(int Value) const;
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/// SizeSLEB128 - Compute the number of bytes required for a signed leb128
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/// value.
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static unsigned SizeSLEB128(int Value);
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//===------------------------------------------------------------------===//
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// Emission and print routines
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//
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/// PrintHex - Print a value as a hexidecimal value.
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///
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void PrintHex(int Value) const;
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/// EOL - Print a newline character to asm stream. If a comment is present
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/// then it will be printed first. Comments should not contain '\n'.
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void EOL() const;
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void EOL(const std::string &Comment) const;
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/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
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/// unsigned leb128 value.
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void EmitULEB128Bytes(unsigned Value) const;
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/// EmitSLEB128Bytes - print an assembler byte data directive to compose a
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/// signed leb128 value.
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void EmitSLEB128Bytes(int Value) const;
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/// EmitInt8 - Emit a byte directive and value.
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///
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void EmitInt8(int Value) const;
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/// EmitInt16 - Emit a short directive and value.
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///
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void EmitInt16(int Value) const;
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/// EmitInt32 - Emit a long directive and value.
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///
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void EmitInt32(int Value) const;
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/// EmitInt64 - Emit a long long directive and value.
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///
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void EmitInt64(uint64_t Value) const;
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/// EmitString - Emit a string with quotes and a null terminator.
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/// Special characters are emitted properly.
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/// @verbatim (Eg. '\t') @endverbatim
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void EmitString(const std::string &String) const;
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//===------------------------------------------------------------------===//
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/// EmitAlignment - Emit an alignment directive to the specified power of
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/// two boundary. For example, if you pass in 3 here, you will get an 8
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/// byte alignment. If a global value is specified, and if that global has
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/// an explicit alignment requested, it will unconditionally override the
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/// alignment request. However, if ForcedAlignBits is specified, this value
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/// has final say: the ultimate alignment will be the max of ForcedAlignBits
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/// and the alignment computed with NumBits and the global. If UseFillExpr
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/// is true, it also emits an optional second value FillValue which the
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/// assembler uses to fill gaps to match alignment.
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///
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/// The algorithm is:
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/// Align = NumBits;
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/// if (GV && GV->hasalignment) Align = GV->getalignment();
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/// Align = std::max(Align, ForcedAlignBits);
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///
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void EmitAlignment(unsigned NumBits, const GlobalValue *GV = 0,
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unsigned ForcedAlignBits = 0, bool UseFillExpr = false,
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unsigned FillValue = 0) const;
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protected:
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/// EmitZeros - Emit a block of zeros.
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///
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void EmitZeros(uint64_t NumZeros) const;
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/// EmitString - Emit a zero-byte-terminated string constant.
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///
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virtual void EmitString(const ConstantArray *CVA) const;
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/// EmitConstantValueOnly - Print out the specified constant, without a
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/// storage class. Only constants of first-class type are allowed here.
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void EmitConstantValueOnly(const Constant *CV);
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/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
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///
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void EmitGlobalConstant(const Constant* CV);
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virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV);
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/// printInlineAsm - This method formats and prints the specified machine
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/// instruction that is an inline asm.
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void printInlineAsm(const MachineInstr *MI) const;
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/// printLabel - This method prints a local label used by debug and
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/// exception handling tables.
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void printLabel(const MachineInstr *MI) const;
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/// printBasicBlockLabel - This method prints the label for the specified
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/// MachineBasicBlock
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virtual void printBasicBlockLabel(const MachineBasicBlock *MBB,
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bool printColon = false,
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bool printComment = true) const;
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/// printSetLabel - This method prints a set label for the specified
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/// MachineBasicBlock
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void printSetLabel(unsigned uid, const MachineBasicBlock *MBB) const;
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void printSetLabel(unsigned uid, unsigned uid2,
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const MachineBasicBlock *MBB) const;
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/// printDataDirective - This method prints the asm directive for the
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/// specified type.
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void printDataDirective(const Type *type);
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private:
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void EmitLLVMUsedList(Constant *List);
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void EmitXXStructorList(Constant *List);
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void EmitConstantPool(unsigned Alignment, const char *Section,
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std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP);
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};
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}
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#endif
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