-//===-- X86AsmPrinter.h - Convert X86 LLVM code to assembly -----*- C++ -*-===//
+//===-- X86AsmPrinter.h - X86 implementation of AsmPrinter ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
-//
-// AT&T assembly code printer class.
-//
-//===----------------------------------------------------------------------===//
-#ifndef X86ASMPRINTER_H
-#define X86ASMPRINTER_H
+#ifndef LLVM_LIB_TARGET_X86_X86ASMPRINTER_H
+#define LLVM_LIB_TARGET_X86_X86ASMPRINTER_H
-#include "X86.h"
-#include "X86MachineFunctionInfo.h"
-#include "X86TargetMachine.h"
+#include "X86Subtarget.h"
#include "llvm/CodeGen/AsmPrinter.h"
-#include "llvm/CodeGen/MachineModuleInfo.h"
-#include "llvm/CodeGen/ValueTypes.h"
-#include "llvm/Support/Compiler.h"
+#include "llvm/CodeGen/StackMaps.h"
+#include "llvm/Target/TargetMachine.h"
-namespace llvm {
+// Implemented in X86MCInstLower.cpp
+namespace {
+ class X86MCInstLower;
+}
+namespace llvm {
class MCStreamer;
+class MCSymbol;
class LLVM_LIBRARY_VISIBILITY X86AsmPrinter : public AsmPrinter {
const X86Subtarget *Subtarget;
+ StackMaps SM;
+
+ void GenerateExportDirective(const MCSymbol *Sym, bool IsData);
+
+ // This utility class tracks the length of a stackmap instruction's 'shadow'.
+ // It is used by the X86AsmPrinter to ensure that the stackmap shadow
+ // invariants (i.e. no other stackmaps, patchpoints, or control flow within
+ // the shadow) are met, while outputting a minimal number of NOPs for padding.
+ //
+ // To minimise the number of NOPs used, the shadow tracker counts the number
+ // of instruction bytes output since the last stackmap. Only if there are too
+ // few instruction bytes to cover the shadow are NOPs used for padding.
+ class StackMapShadowTracker {
+ public:
+ StackMapShadowTracker(TargetMachine &TM);
+ ~StackMapShadowTracker();
+ void startFunction(MachineFunction &MF);
+ void count(MCInst &Inst, const MCSubtargetInfo &STI);
+
+ // Called to signal the start of a shadow of RequiredSize bytes.
+ void reset(unsigned RequiredSize) {
+ RequiredShadowSize = RequiredSize;
+ CurrentShadowSize = 0;
+ InShadow = true;
+ }
+
+ // Called before every stackmap/patchpoint, and at the end of basic blocks,
+ // to emit any necessary padding-NOPs.
+ void emitShadowPadding(MCStreamer &OutStreamer, const MCSubtargetInfo &STI);
+ private:
+ TargetMachine &TM;
+ const MachineFunction *MF;
+ std::unique_ptr<MCCodeEmitter> CodeEmitter;
+ bool InShadow;
+
+ // RequiredShadowSize holds the length of the shadow specified in the most
+ // recently encountered STACKMAP instruction.
+ // CurrentShadowSize counts the number of bytes encoded since the most
+ // recently encountered STACKMAP, stopping when that number is greater than
+ // or equal to RequiredShadowSize.
+ unsigned RequiredShadowSize, CurrentShadowSize;
+ };
+
+ StackMapShadowTracker SMShadowTracker;
+
+ // All instructions emitted by the X86AsmPrinter should use this helper
+ // method.
+ //
+ // This helper function invokes the SMShadowTracker on each instruction before
+ // outputting it to the OutStream. This allows the shadow tracker to minimise
+ // the number of NOPs used for stackmap padding.
+ void EmitAndCountInstruction(MCInst &Inst);
+
+ void InsertStackMapShadows(MachineFunction &MF);
+ void LowerSTACKMAP(const MachineInstr &MI);
+ void LowerPATCHPOINT(const MachineInstr &MI, X86MCInstLower &MCIL);
+
+ void LowerTlsAddr(X86MCInstLower &MCInstLowering, const MachineInstr &MI);
+
public:
- explicit X86AsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
- : AsmPrinter(TM, Streamer) {
- Subtarget = &TM.getSubtarget<X86Subtarget>();
- }
+ explicit X86AsmPrinter(TargetMachine &TM,
+ std::unique_ptr<MCStreamer> Streamer)
+ : AsmPrinter(TM, std::move(Streamer)), SM(*this), SMShadowTracker(TM) {}
- virtual const char *getPassName() const {
- return "X86 AT&T-Style Assembly Printer";
+ const char *getPassName() const override {
+ return "X86 Assembly / Object Emitter";
}
-
+
const X86Subtarget &getSubtarget() const { return *Subtarget; }
- virtual void EmitStartOfAsmFile(Module &M);
+ void EmitStartOfAsmFile(Module &M) override;
+
+ void EmitEndOfAsmFile(Module &M) override;
- virtual void EmitEndOfAsmFile(Module &M);
-
- virtual void EmitInstruction(const MachineInstr *MI);
-
- void printSymbolOperand(const MachineOperand &MO, raw_ostream &O);
+ void EmitInstruction(const MachineInstr *MI) override;
- // These methods are used by the tablegen'erated instruction printer.
- void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O,
- const char *Modifier = 0);
- void print_pcrel_imm(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
+ void EmitBasicBlockEnd(const MachineBasicBlock &MBB) override {
+ SMShadowTracker.emitShadowPadding(OutStreamer, getSubtargetInfo());
+ }
- bool printAsmMRegister(const MachineOperand &MO, char Mode, raw_ostream &O);
bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant, const char *ExtraCode,
- raw_ostream &OS);
+ raw_ostream &OS) override;
bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant, const char *ExtraCode,
- raw_ostream &OS);
-
- void printMachineInstruction(const MachineInstr *MI);
- void printSSECC(const MachineInstr *MI, unsigned Op, raw_ostream &O);
- void printMemReference(const MachineInstr *MI, unsigned Op, raw_ostream &O,
- const char *Modifier=NULL);
- void printLeaMemReference(const MachineInstr *MI, unsigned Op, raw_ostream &O,
- const char *Modifier=NULL);
+ raw_ostream &OS) override;
- void printPICLabel(const MachineInstr *MI, unsigned Op, raw_ostream &O);
+ /// \brief Return the symbol for the specified constant pool entry.
+ MCSymbol *GetCPISymbol(unsigned CPID) const override;
- bool runOnMachineFunction(MachineFunction &F);
-
- void PrintDebugValueComment(const MachineInstr *MI, raw_ostream &OS);
+ bool doInitialization(Module &M) override {
+ SMShadowTracker.reset(0);
+ SM.reset();
+ return AsmPrinter::doInitialization(M);
+ }
- MachineLocation getDebugValueLocation(const MachineInstr *MI) const;
+ bool runOnMachineFunction(MachineFunction &F) override;
};
} // end namespace llvm
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