freebsd-dev/include/llvm/CodeGen/AsmPrinter.h
2009-07-04 13:58:26 +00:00

415 lines
16 KiB
C++

//===-- llvm/CodeGen/AsmPrinter.h - AsmPrinter Framework --------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains a class to be used as the base class for target specific
// asm writers. This class primarily handles common functionality used by
// all asm writers.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_ASMPRINTER_H
#define LLVM_CODEGEN_ASMPRINTER_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/Target/TargetMachine.h"
#include <set>
namespace llvm {
class GCStrategy;
class Constant;
class ConstantArray;
class ConstantInt;
class ConstantStruct;
class ConstantVector;
class GCMetadataPrinter;
class GlobalVariable;
class MachineConstantPoolEntry;
class MachineConstantPoolValue;
class MachineModuleInfo;
class DwarfWriter;
class Mangler;
class Section;
class TargetAsmInfo;
class Type;
class raw_ostream;
/// AsmPrinter - This class is intended to be used as a driving class for all
/// asm writers.
class AsmPrinter : public MachineFunctionPass {
static char ID;
/// FunctionNumber - This provides a unique ID for each function emitted in
/// this translation unit. It is autoincremented by SetupMachineFunction,
/// and can be accessed with getFunctionNumber() and
/// IncrementFunctionNumber().
///
unsigned FunctionNumber;
// GCMetadataPrinters - The garbage collection metadata printer table.
typedef DenseMap<GCStrategy*,GCMetadataPrinter*> gcp_map_type;
typedef gcp_map_type::iterator gcp_iterator;
gcp_map_type GCMetadataPrinters;
protected:
/// MMI - If available, this is a pointer to the current MachineModuleInfo.
MachineModuleInfo *MMI;
/// DW - If available, this is a pointer to the current dwarf writer.
DwarfWriter *DW;
public:
/// Output stream on which we're printing assembly code.
///
raw_ostream &O;
/// Target machine description.
///
TargetMachine &TM;
/// Target Asm Printer information.
///
const TargetAsmInfo *TAI;
/// Target Register Information.
///
const TargetRegisterInfo *TRI;
/// The current machine function.
const MachineFunction *MF;
/// Name-mangler for global names.
///
Mangler *Mang;
/// Cache of mangled name for current function. This is recalculated at the
/// beginning of each call to runOnMachineFunction().
///
std::string CurrentFnName;
/// CurrentSection - The current section we are emitting to. This is
/// controlled and used by the SwitchSection method.
std::string CurrentSection;
const Section* CurrentSection_;
/// IsInTextSection - True if the current section we are emitting to is a
/// text section.
bool IsInTextSection;
/// VerboseAsm - Emit comments in assembly output if this is true.
///
bool VerboseAsm;
/// Private state for PrintSpecial()
// Assign a unique ID to this machine instruction.
mutable const MachineInstr *LastMI;
mutable const Function *LastFn;
mutable unsigned Counter;
// Private state for processDebugLock()
mutable DebugLocTuple PrevDLT;
protected:
explicit AsmPrinter(raw_ostream &o, TargetMachine &TM,
const TargetAsmInfo *T, bool V);
public:
virtual ~AsmPrinter();
/// isVerbose - Return true if assembly output should contain comments.
///
bool isVerbose() const { return VerboseAsm; }
/// SwitchToTextSection - Switch to the specified section of the executable
/// if we are not already in it! If GV is non-null and if the global has an
/// explicitly requested section, we switch to the section indicated for the
/// global instead of NewSection.
///
/// If the new section is an empty string, this method forgets what the
/// current section is, but does not emit a .section directive.
///
/// This method is used when about to emit executable code.
///
void SwitchToTextSection(const char *NewSection,
const GlobalValue *GV = NULL);
/// SwitchToDataSection - Switch to the specified section of the executable
/// if we are not already in it! If GV is non-null and if the global has an
/// explicitly requested section, we switch to the section indicated for the
/// global instead of NewSection.
///
/// If the new section is an empty string, this method forgets what the
/// current section is, but does not emit a .section directive.
///
/// This method is used when about to emit data. For most assemblers, this
/// is the same as the SwitchToTextSection method, but not all assemblers
/// are the same.
///
void SwitchToDataSection(const char *NewSection,
const GlobalValue *GV = NULL);
/// SwitchToSection - Switch to the specified section of the executable if
/// we are not already in it!
void SwitchToSection(const Section* NS);
/// getGlobalLinkName - Returns the asm/link name of of the specified
/// global variable. Should be overridden by each target asm printer to
/// generate the appropriate value.
virtual const std::string &getGlobalLinkName(const GlobalVariable *GV,
std::string &LinkName) const;
/// EmitExternalGlobal - Emit the external reference to a global variable.
/// Should be overridden if an indirect reference should be used.
virtual void EmitExternalGlobal(const GlobalVariable *GV);
/// getCurrentFunctionEHName - Called to return (and cache) the
/// CurrentFnEHName.
///
const std::string &getCurrentFunctionEHName(const MachineFunction *MF,
std::string &FuncEHName) const;
protected:
/// getAnalysisUsage - Record analysis usage.
///
void getAnalysisUsage(AnalysisUsage &AU) const;
/// doInitialization - Set up the AsmPrinter when we are working on a new
/// module. If your pass overrides this, it must make sure to explicitly
/// call this implementation.
bool doInitialization(Module &M);
/// doFinalization - Shut down the asmprinter. If you override this in your
/// pass, you must make sure to call it explicitly.
bool doFinalization(Module &M);
/// PrintSpecial - Print information related to the specified machine instr
/// that is independent of the operand, and may be independent of the instr
/// itself. This can be useful for portably encoding the comment character
/// or other bits of target-specific knowledge into the asmstrings. The
/// syntax used is ${:comment}. Targets can override this to add support
/// for their own strange codes.
virtual void PrintSpecial(const MachineInstr *MI, const char *Code) const;
/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
/// instruction, using the specified assembler variant. Targets should
/// override this to format as appropriate. This method can return true if
/// the operand is erroneous.
virtual bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant, const char *ExtraCode);
/// PrintAsmMemoryOperand - Print the specified operand of MI, an INLINEASM
/// instruction, using the specified assembler variant as an address.
/// Targets should override this to format as appropriate. This method can
/// return true if the operand is erroneous.
virtual bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant,
const char *ExtraCode);
/// SetupMachineFunction - This should be called when a new MachineFunction
/// is being processed from runOnMachineFunction.
void SetupMachineFunction(MachineFunction &MF);
/// getFunctionNumber - Return a unique ID for the current function.
///
unsigned getFunctionNumber() const { return FunctionNumber; }
/// IncrementFunctionNumber - Increase Function Number. AsmPrinters should
/// not normally call this, as the counter is automatically bumped by
/// SetupMachineFunction.
void IncrementFunctionNumber() { FunctionNumber++; }
/// EmitConstantPool - Print to the current output stream assembly
/// representations of the constants in the constant pool MCP. This is
/// used to print out constants which have been "spilled to memory" by
/// the code generator.
///
void EmitConstantPool(MachineConstantPool *MCP);
/// EmitJumpTableInfo - Print assembly representations of the jump tables
/// used by the current function to the current output stream.
///
void EmitJumpTableInfo(MachineJumpTableInfo *MJTI, MachineFunction &MF);
/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
/// special global used by LLVM. If so, emit it and return true, otherwise
/// do nothing and return false.
bool EmitSpecialLLVMGlobal(const GlobalVariable *GV);
public:
//===------------------------------------------------------------------===//
/// LEB 128 number encoding.
/// PrintULEB128 - Print a series of hexidecimal values(separated by commas)
/// representing an unsigned leb128 value.
void PrintULEB128(unsigned Value) const;
/// PrintSLEB128 - Print a series of hexidecimal values(separated by commas)
/// representing a signed leb128 value.
void PrintSLEB128(int Value) const;
//===------------------------------------------------------------------===//
// Emission and print routines
//
/// PrintHex - Print a value as a hexidecimal value.
///
void PrintHex(int Value) const;
/// EOL - Print a newline character to asm stream. If a comment is present
/// then it will be printed first. Comments should not contain '\n'.
void EOL() const;
void EOL(const std::string &Comment) const;
void EOL(const char* Comment) const;
/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
/// unsigned leb128 value.
void EmitULEB128Bytes(unsigned Value) const;
/// EmitSLEB128Bytes - print an assembler byte data directive to compose a
/// signed leb128 value.
void EmitSLEB128Bytes(int Value) const;
/// EmitInt8 - Emit a byte directive and value.
///
void EmitInt8(int Value) const;
/// EmitInt16 - Emit a short directive and value.
///
void EmitInt16(int Value) const;
/// EmitInt32 - Emit a long directive and value.
///
void EmitInt32(int Value) const;
/// EmitInt64 - Emit a long long directive and value.
///
void EmitInt64(uint64_t Value) const;
/// EmitString - Emit a string with quotes and a null terminator.
/// Special characters are emitted properly.
/// @verbatim (Eg. '\t') @endverbatim
void EmitString(const std::string &String) const;
void EmitString(const char *String, unsigned Size) const;
/// EmitFile - Emit a .file directive.
void EmitFile(unsigned Number, const std::string &Name) const;
//===------------------------------------------------------------------===//
/// EmitAlignment - Emit an alignment directive to the specified power of
/// two boundary. For example, if you pass in 3 here, you will get an 8
/// byte alignment. If a global value is specified, and if that global has
/// an explicit alignment requested, it will unconditionally override the
/// alignment request. However, if ForcedAlignBits is specified, this value
/// has final say: the ultimate alignment will be the max of ForcedAlignBits
/// and the alignment computed with NumBits and the global. If UseFillExpr
/// is true, it also emits an optional second value FillValue which the
/// assembler uses to fill gaps to match alignment for text sections if the
/// has specified a non-zero fill value.
///
/// The algorithm is:
/// Align = NumBits;
/// if (GV && GV->hasalignment) Align = GV->getalignment();
/// Align = std::max(Align, ForcedAlignBits);
///
void EmitAlignment(unsigned NumBits, const GlobalValue *GV = 0,
unsigned ForcedAlignBits = 0,
bool UseFillExpr = true) const;
/// printLabel - This method prints a local label used by debug and
/// exception handling tables.
void printLabel(const MachineInstr *MI) const;
void printLabel(unsigned Id) const;
/// printDeclare - This method prints a local variable declaration used by
/// debug tables.
void printDeclare(const MachineInstr *MI) const;
protected:
/// EmitZeros - Emit a block of zeros.
///
void EmitZeros(uint64_t NumZeros, unsigned AddrSpace = 0) const;
/// EmitString - Emit a zero-byte-terminated string constant.
///
virtual void EmitString(const ConstantArray *CVA) const;
/// EmitConstantValueOnly - Print out the specified constant, without a
/// storage class. Only constants of first-class type are allowed here.
void EmitConstantValueOnly(const Constant *CV);
/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
void EmitGlobalConstant(const Constant* CV, unsigned AddrSpace = 0);
virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV);
/// processDebugLoc - Processes the debug information of each machine
/// instruction's DebugLoc.
void processDebugLoc(DebugLoc DL);
/// printInlineAsm - This method formats and prints the specified machine
/// instruction that is an inline asm.
void printInlineAsm(const MachineInstr *MI) const;
/// printImplicitDef - This method prints the specified machine instruction
/// that is an implicit def.
virtual void printImplicitDef(const MachineInstr *MI) const;
/// printBasicBlockLabel - This method prints the label for the specified
/// MachineBasicBlock
virtual void printBasicBlockLabel(const MachineBasicBlock *MBB,
bool printAlign = false,
bool printColon = false,
bool printComment = true) const;
/// printPICJumpTableSetLabel - This method prints a set label for the
/// specified MachineBasicBlock for a jumptable entry.
virtual void printPICJumpTableSetLabel(unsigned uid,
const MachineBasicBlock *MBB) const;
virtual void printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
const MachineBasicBlock *MBB) const;
virtual void printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
const MachineBasicBlock *MBB,
unsigned uid) const;
/// printDataDirective - This method prints the asm directive for the
/// specified type.
void printDataDirective(const Type *type, unsigned AddrSpace = 0);
/// printSuffixedName - This prints a name with preceding
/// getPrivateGlobalPrefix and the specified suffix, handling quoted names
/// correctly.
void printSuffixedName(const char *Name, const char *Suffix,
const char *Prefix = 0);
void printSuffixedName(const std::string &Name, const char* Suffix);
/// printVisibility - This prints visibility information about symbol, if
/// this is suported by the target.
void printVisibility(const std::string& Name, unsigned Visibility) const;
/// printOffset - This is just convenient handler for printing offsets.
void printOffset(int64_t Offset) const;
private:
const GlobalValue *findGlobalValue(const Constant* CV);
void EmitLLVMUsedList(Constant *List);
void EmitXXStructorList(Constant *List);
void EmitGlobalConstantStruct(const ConstantStruct* CVS,
unsigned AddrSpace);
void EmitGlobalConstantArray(const ConstantArray* CVA, unsigned AddrSpace);
void EmitGlobalConstantVector(const ConstantVector* CP);
void EmitGlobalConstantFP(const ConstantFP* CFP, unsigned AddrSpace);
void EmitGlobalConstantLargeInt(const ConstantInt* CI, unsigned AddrSpace);
GCMetadataPrinter *GetOrCreateGCPrinter(GCStrategy *C);
};
}
#endif