//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
-// This class is intended to be used as a base class for target-specific
-// asmwriters. This class primarily takes care of printing global constants,
-// which are printed in a very similar way across all targets.
+// 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.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/Support/DataTypes.h"
+#include <set>
namespace llvm {
class Constant;
class ConstantArray;
- class Mangler;
class GlobalVariable;
+ class GlobalAlias;
+ class MachineConstantPoolEntry;
+ class MachineConstantPoolValue;
+ class Mangler;
+ class TargetAsmInfo;
+
+ /// AsmPrinter - This class is intended to be used as a driving class for all
+ /// asm writers.
class AsmPrinter : public MachineFunctionPass {
- protected:
- /// CurrentSection - The current section we are emitting to. This is
- /// controlled and used by the SwitchSection method.
- std::string CurrentSection;
-
- private:
+ 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
///
unsigned FunctionNumber;
+ protected:
+ // Necessary for external weak linkage support
+ std::set<const GlobalValue*> ExtWeakSymbols;
+
public:
/// Output stream on which we're printing assembly code.
///
/// Target machine description.
///
TargetMachine &TM;
+
+ /// Target Asm Printer information.
+ ///
+ const TargetAsmInfo *TAI;
/// Name-mangler for global names.
///
/// beginning of each call to runOnMachineFunction().
///
std::string CurrentFnName;
-
- //===------------------------------------------------------------------===//
- // Properties to be set by the derived class ctor, used to configure the
- // asmwriter.
-
- /// CommentString - This indicates the comment character used by the
- /// assembler.
- const char *CommentString; // Defaults to "#"
-
- /// GlobalPrefix - If this is set to a non-empty string, it is prepended
- /// onto all global symbols. This is often used for "_" or ".".
- const char *GlobalPrefix; // Defaults to ""
-
- /// PrivateGlobalPrefix - This prefix is used for globals like constant
- /// pool entries that are completely private to the .o file and should not
- /// have names in the .o file. This is often "." or "L".
- const char *PrivateGlobalPrefix; // Defaults to "."
-
- /// GlobalVarAddrPrefix/Suffix - If these are nonempty, these strings
- /// will enclose any GlobalVariable (that isn't a function)
- ///
- const char *GlobalVarAddrPrefix; // Defaults to ""
- const char *GlobalVarAddrSuffix; // Defaults to ""
-
- /// FunctionAddrPrefix/Suffix - If these are nonempty, these strings
- /// will enclose any GlobalVariable that points to a function.
- /// For example, this is used by the IA64 backend to materialize
- /// function descriptors, by decorating the ".data8" object with the
- /// @fptr( ) link-relocation operator.
- ///
- const char *FunctionAddrPrefix; // Defaults to ""
- const char *FunctionAddrSuffix; // Defaults to ""
-
- /// InlineAsmStart/End - If these are nonempty, they contain a directive to
- /// emit before and after an inline assmebly statement.
- const char *InlineAsmStart; // Defaults to "#APP\n"
- const char *InlineAsmEnd; // Defaults to "#NO_APP\n"
-
- //===--- Data Emission Directives -------------------------------------===//
-
- /// ZeroDirective - this should be set to the directive used to get some
- /// number of zero bytes emitted to the current section. Common cases are
- /// "\t.zero\t" and "\t.space\t". If this is set to null, the
- /// Data*bitsDirective's will be used to emit zero bytes.
- const char *ZeroDirective; // Defaults to "\t.zero\t"
-
- /// AsciiDirective - This directive allows emission of an ascii string with
- /// the standard C escape characters embedded into it.
- const char *AsciiDirective; // Defaults to "\t.ascii\t"
-
- /// AscizDirective - If not null, this allows for special handling of
- /// zero terminated strings on this target. This is commonly supported as
- /// ".asciz". If a target doesn't support this, it can be set to null.
- const char *AscizDirective; // Defaults to "\t.asciz\t"
-
- /// DataDirectives - These directives are used to output some unit of
- /// integer data to the current section. If a data directive is set to
- /// null, smaller data directives will be used to emit the large sizes.
- const char *Data8bitsDirective; // Defaults to "\t.byte\t"
- const char *Data16bitsDirective; // Defaults to "\t.short\t"
- const char *Data32bitsDirective; // Defaults to "\t.long\t"
- const char *Data64bitsDirective; // Defaults to "\t.quad\t"
-
- //===--- Alignment Information ----------------------------------------===//
-
- /// AlignDirective - The directive used to emit round up to an alignment
- /// boundary.
- ///
- const char *AlignDirective; // Defaults to "\t.align\t"
-
- /// AlignmentIsInBytes - If this is true (the default) then the asmprinter
- /// emits ".align N" directives, where N is the number of bytes to align to.
- /// Otherwise, it emits ".align log2(N)", e.g. 3 to align to an 8 byte
- /// boundary.
- bool AlignmentIsInBytes; // Defaults to true
-
- //===--- Section Switching Directives ---------------------------------===//
-
- /// SwitchToSectionDirective - This is the directive used when we want to
- /// emit a global to an arbitrary section. The section name is emited after
- /// this.
- const char *SwitchToSectionDirective; // Defaults to "\t.section\t"
-
- /// ConstantPoolSection - This is the section that we SwitchToSection right
- /// before emitting the constant pool for a function.
- const char *ConstantPoolSection; // Defaults to "\t.section .rodata\n"
-
- /// JumpTableSection - This is the section that we SwitchToSection right
- /// before emitting the jump tables for a function.
- const char *JumpTableSection; // Defaults to "\t.section .rodata\n"
- /// StaticCtorsSection - This is the directive that is emitted to switch to
- /// a section to emit the static constructor list.
- /// Defaults to "\t.section .ctors,\"aw\",@progbits".
- const char *StaticCtorsSection;
-
- /// StaticDtorsSection - This is the directive that is emitted to switch to
- /// a section to emit the static destructor list.
- /// Defaults to "\t.section .dtors,\"aw\",@progbits".
- const char *StaticDtorsSection;
-
- //===--- Global Variable Emission Directives --------------------------===//
-
- /// LCOMMDirective - This is the name of a directive (if supported) that can
- /// be used to efficiently declare a local (internal) block of zero
- /// initialized data in the .bss/.data section. The syntax expected is:
- /// <LCOMMDirective> SYMBOLNAME LENGTHINBYTES, ALIGNMENT
- const char *LCOMMDirective; // Defaults to null.
-
- const char *COMMDirective; // Defaults to "\t.comm\t".
-
- /// COMMDirectiveTakesAlignment - True if COMMDirective take a third
- /// argument that specifies the alignment of the declaration.
- bool COMMDirectiveTakesAlignment; // Defaults to true.
-
- /// HasDotTypeDotSizeDirective - True if the target has .type and .size
- /// directives, this is true for most ELF targets.
- bool HasDotTypeDotSizeDirective; // Defaults to true.
+ /// CurrentSection - The current section we are emitting to. This is
+ /// controlled and used by the SwitchSection method.
+ std::string CurrentSection;
protected:
- AsmPrinter(std::ostream &o, TargetMachine &TM);
+ AsmPrinter(std::ostream &o, TargetMachine &TM, const TargetAsmInfo *T);
public:
- /// SwitchSection - 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
+ /// 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.
///
- virtual void SwitchSection(const char *NewSection, const GlobalValue *GV);
+ /// 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);
+
+ /// 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) 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.
+ ///
+ std::string getCurrentFunctionEHName(const MachineFunction *MF);
- /// getPreferredAlignmentLog - Return the preferred alignment of the
- /// specified global, returned in log form. This includes an explicitly
- /// requested alignment (if the global has one).
- unsigned getPreferredAlignmentLog(const GlobalVariable *GV) const;
protected:
/// doInitialization - Set up the AsmPrinter when we are working on a new
/// module. If your pass overrides this, it must make sure to explicitly
/// 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);
/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
/// instruction, using the specified assembler variant. Targets should
unsigned AsmVariant,
const char *ExtraCode);
+ /// getSectionForFunction - Return the section that we should emit the
+ /// specified function body into. This defaults to 'TextSection'. This
+ /// should most likely be overridden by the target to put linkonce/weak
+ /// functions into special sections.
+ virtual std::string getSectionForFunction(const Function &F) const;
+
/// SetupMachineFunction - This should be called when a new MachineFunction
/// is being processed from runOnMachineFunction.
void SetupMachineFunction(MachineFunction &MF);
/// EmitJumpTableInfo - Print assembly representations of the jump tables
/// used by the current function to the current output stream.
///
- void EmitJumpTableInfo(MachineJumpTableInfo *MJTI);
+ 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;
+
+ /// SizeULEB128 - Compute the number of bytes required for an unsigned
+ /// leb128 value.
+ static unsigned SizeULEB128(unsigned Value);
+
+ /// PrintSLEB128 - Print a series of hexidecimal values(separated by commas)
+ /// representing a signed leb128 value.
+ void PrintSLEB128(int Value) const;
+
+ /// SizeSLEB128 - Compute the number of bytes required for a signed leb128
+ /// value.
+ static unsigned SizeSLEB128(int Value);
+
+ //===------------------------------------------------------------------===//
+ // 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;
+
+ /// 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;
+
+ /// 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 override the alignment request.
- void EmitAlignment(unsigned NumBits, const GlobalValue *GV = 0) const;
+ /// 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.
+ ///
+ /// 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 = false,
+ unsigned FillValue = 0) const;
+ protected:
/// EmitZeros - Emit a block of zeros.
///
- virtual void EmitZeros(uint64_t NumZeros) const;
+ void EmitZeros(uint64_t NumZeros) const;
/// EmitString - Emit a zero-byte-terminated string constant.
///
void EmitConstantValueOnly(const Constant *CV);
/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
- ///
- void EmitGlobalConstant(const Constant* CV);
+ /// If Packed is false, pad to the ABI size.
+ void EmitGlobalConstant(const Constant* CV, bool Packed = false);
+
+ virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV);
/// printInlineAsm - This method formats and prints the specified machine
/// instruction that is an inline asm.
void printInlineAsm(const MachineInstr *MI) const;
+ /// printLabel - This method prints a local label used by debug and
+ /// exception handling tables.
+ void printLabel(const MachineInstr *MI) const;
+
/// printBasicBlockLabel - This method prints the label for the specified
/// MachineBasicBlock
- virtual void printBasicBlockLabel(const MachineBasicBlock *MBB) const;
+ virtual void printBasicBlockLabel(const MachineBasicBlock *MBB,
+ 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);
+
private:
+ void EmitLLVMUsedList(Constant *List);
void EmitXXStructorList(Constant *List);
+ void EmitConstantPool(unsigned Alignment, const char *Section,
+ std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP);
};
}
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