-//===-- X86AsmPrinter.h - Convert X86 LLVM code to Intel assembly ---------===//
+//===-- X86AsmPrinter.h - X86 implementation of AsmPrinter ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
-//
-// This file the shared super class printer that converts from our internal
-// representation of machine-dependent LLVM code to Intel and AT&T format
-// assembly language. This printer is the output mechanism used by `llc'.
-//
-//===----------------------------------------------------------------------===//
-#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/DwarfWriter.h"
-#include "llvm/CodeGen/MachineModuleInfo.h"
-#include "llvm/Support/Compiler.h"
-#include <set>
+#include "llvm/CodeGen/StackMaps.h"
+#include "llvm/Target/TargetMachine.h"
+// Implemented in X86MCInstLower.cpp
+namespace {
+ class X86MCInstLower;
+}
namespace llvm {
+class MCStreamer;
+class MCSymbol;
-struct VISIBILITY_HIDDEN X86SharedAsmPrinter : public AsmPrinter {
- DwarfWriter DW;
- MachineModuleInfo *MMI;
+class LLVM_LIBRARY_VISIBILITY X86AsmPrinter : public AsmPrinter {
+ const X86Subtarget *Subtarget;
+ StackMaps SM;
- X86SharedAsmPrinter(std::ostream &O, X86TargetMachine &TM,
- const TargetAsmInfo *T)
- : AsmPrinter(O, TM, T), DW(O, this, T), MMI(0) {
- Subtarget = &TM.getSubtarget<X86Subtarget>();
- }
+ void GenerateExportDirective(const MCSymbol *Sym, bool IsData);
- // We have to propagate some information about MachineFunction to
- // AsmPrinter. It's ok, when we're printing the function, since we have
- // access to MachineFunction and can get the appropriate MachineFunctionInfo.
- // Unfortunately, this is not possible when we're printing reference to
- // Function (e.g. calling it and so on). Even more, there is no way to get the
- // corresponding MachineFunctions: it can even be not created at all. That's
- // why we should use additional structure, when we're collecting all necessary
- // information.
+ // 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.
//
- // This structure is using e.g. for name decoration for stdcall & fastcall'ed
- // function, since we have to use arguments' size for decoration.
- typedef std::map<const Function*, X86MachineFunctionInfo> FMFInfoMap;
- FMFInfoMap FunctionInfoMap;
-
- void decorateName(std::string& Name, const GlobalValue* GV);
-
- bool doInitialization(Module &M);
- bool doFinalization(Module &M);
-
- void getAnalysisUsage(AnalysisUsage &AU) const {
- AU.setPreservesAll();
- if (Subtarget->isTargetDarwin() ||
- Subtarget->isTargetELF() ||
- Subtarget->isTargetCygMing()) {
- AU.addRequired<MachineModuleInfo>();
+ // 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;
}
- AsmPrinter::getAnalysisUsage(AU);
+
+ // 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,
+ std::unique_ptr<MCStreamer> Streamer)
+ : AsmPrinter(TM, std::move(Streamer)), SM(*this), SMShadowTracker(TM) {}
+
+ const char *getPassName() const override {
+ return "X86 Assembly / Object Emitter";
}
- const X86Subtarget *Subtarget;
+ const X86Subtarget &getSubtarget() const { return *Subtarget; }
- // Necessary for Darwin to print out the apprioriate types of linker stubs
- std::set<std::string> FnStubs, GVStubs, LinkOnceStubs;
+ void EmitStartOfAsmFile(Module &M) override;
- // Necessary for dllexport support
- std::set<std::string> DLLExportedFns, DLLExportedGVs;
+ void EmitEndOfAsmFile(Module &M) override;
- inline static bool isScale(const MachineOperand &MO) {
- return MO.isImmediate() &&
- (MO.getImmedValue() == 1 || MO.getImmedValue() == 2 ||
- MO.getImmedValue() == 4 || MO.getImmedValue() == 8);
+ void EmitInstruction(const MachineInstr *MI) override;
+
+ void EmitBasicBlockEnd(const MachineBasicBlock &MBB) override {
+ SMShadowTracker.emitShadowPadding(OutStreamer, getSubtargetInfo());
}
- inline static bool isMem(const MachineInstr *MI, unsigned Op) {
- if (MI->getOperand(Op).isFrameIndex()) return true;
- return Op+4 <= MI->getNumOperands() &&
- MI->getOperand(Op ).isRegister() && isScale(MI->getOperand(Op+1)) &&
- MI->getOperand(Op+2).isRegister() &&
- (MI->getOperand(Op+3).isImmediate() ||
- MI->getOperand(Op+3).isGlobalAddress() ||
- MI->getOperand(Op+3).isConstantPoolIndex() ||
- MI->getOperand(Op+3).isJumpTableIndex());
+ bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
+ unsigned AsmVariant, const char *ExtraCode,
+ raw_ostream &OS) override;
+ bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
+ unsigned AsmVariant, const char *ExtraCode,
+ raw_ostream &OS) override;
+
+ /// \brief Return the symbol for the specified constant pool entry.
+ MCSymbol *GetCPISymbol(unsigned CPID) const override;
+
+ bool doInitialization(Module &M) override {
+ SMShadowTracker.reset(0);
+ SM.reset();
+ return AsmPrinter::doInitialization(M);
}
+
+ bool runOnMachineFunction(MachineFunction &F) override;
};
} // end namespace llvm
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