//
//===----------------------------------------------------------------------===//
//
-// 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 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 {
/// FunctionNumber - This provides a unique ID for each function emitted in
/// this translation unit. It is autoincremented by SetupMachineFunction,
///
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
- /// \literal @fptr( ) \endliteral
- /// 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"
- const char *ZeroDirectiveSuffix; // Defaults to ""
-
- /// 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 ---------------------------------===//
/// CurrentSection - The current section we are emitting to. This is
/// controlled and used by the SwitchSection method.
std::string CurrentSection;
-
- /// 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"
-
- /// TextSectionStartSuffix - This is printed after each start of section
- /// directive for text sections.
- const char *TextSectionStartSuffix; // Defaults to "".
-
- /// DataSectionStartSuffix - This is printed after each start of section
- /// directive for data sections.
- const char *DataSectionStartSuffix; // Defaults to "".
-
- /// SectionEndDirectiveSuffix - If non-null, the asm printer will close each
- /// section with the section name and this suffix printed.
- const char *SectionEndDirectiveSuffix; // Defaults to null.
-
- /// 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;
-
- /// FourByteConstantSection, EightByteConstantSection,
- /// SixteenByteConstantSection - These are special sections where we place
- /// 4-, 8-, and 16- byte constant literals.
- const char *FourByteConstantSection;
- const char *EightByteConstantSection;
- const char *SixteenByteConstantSection;
-
- //===--- 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:
- /// \literal <LCOMMDirective> SYMBOLNAME LENGTHINBYTES, ALIGNMENT
- /// \endliteral
- 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.
protected:
- AsmPrinter(std::ostream &o, TargetMachine &TM);
+ AsmPrinter(std::ostream &o, TargetMachine &TM, const TargetAsmInfo *T);
public:
/// SwitchToTextSection - Switch to the specified section of the executable
///
/// This method is used when about to emit executable code.
///
- void SwitchToTextSection(const char *NewSection, const GlobalValue *GV);
+ 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
/// is the same as the SwitchToTextSection method, but not all assemblers
/// are the same.
///
- void SwitchToDataSection(const char *NewSection, const GlobalValue *GV);
+ void SwitchToDataSection(const char *NewSection, const GlobalValue *GV = NULL);
- /// 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;
+ /// 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;
+
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);
-
+
/// 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
/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
///
void EmitGlobalConstant(const Constant* CV);
+
+ virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV);
/// printInlineAsm - This method formats and prints the specified machine
/// instruction that is an inline asm.
virtual void printBasicBlockLabel(const MachineBasicBlock *MBB,
bool printColon = false,
bool printComment = true) const;
-
+
+ /// printSetLabel - This method prints a set label for the specified
+ /// MachineBasicBlock
+ void printSetLabel(unsigned uid, const MachineBasicBlock *MBB) const;
+ void printSetLabel(unsigned uid, unsigned uid2,
+ const MachineBasicBlock *MBB) 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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