Bug Summary

File:lib/Target/X86/X86ExpandPseudo.cpp
Warning:line 166, column 1
Potential memory leak

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name X86ExpandPseudo.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-eagerly-assume -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -mrelocation-model pic -pic-level 2 -mthread-model posix -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-7/lib/clang/7.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-7~svn329677/build-llvm/lib/Target/X86 -I /build/llvm-toolchain-snapshot-7~svn329677/lib/Target/X86 -I /build/llvm-toolchain-snapshot-7~svn329677/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn329677/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0/backward -internal-isystem /usr/include/clang/7.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-7~svn329677/build-llvm/lib/Target/X86 -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-checker optin.performance.Padding -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-04-11-031539-24776-1 -x c++ /build/llvm-toolchain-snapshot-7~svn329677/lib/Target/X86/X86ExpandPseudo.cpp

/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/X86/X86ExpandPseudo.cpp

→
1//===------- X86ExpandPseudo.cpp - Expand pseudo instructions -------------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file contains a pass that expands pseudo instructions into target
11// instructions to allow proper scheduling, if-conversion, other late
12// optimizations, or simply the encoding of the instructions.
13//
14//===----------------------------------------------------------------------===//
15
16#include "X86.h"
17#include "X86FrameLowering.h"
18#include "X86InstrBuilder.h"
19#include "X86InstrInfo.h"
20#include "X86MachineFunctionInfo.h"
21#include "X86Subtarget.h"
22#include "llvm/Analysis/EHPersonalities.h"
23#include "llvm/CodeGen/MachineFunctionPass.h"
24#include "llvm/CodeGen/MachineInstrBuilder.h"
25#include "llvm/CodeGen/Passes.h" // For IDs of passes that are preserved.
26#include "llvm/IR/GlobalValue.h"
27using namespace llvm;
28
29#define DEBUG_TYPE"x86-pseudo" "x86-pseudo"
30
31namespace {
32class X86ExpandPseudo : public MachineFunctionPass {
33public:
34 static char ID;
35 X86ExpandPseudo() : MachineFunctionPass(ID) {}
36
37 void getAnalysisUsage(AnalysisUsage &AU) const override {
38 AU.setPreservesCFG();
39 AU.addPreservedID(MachineLoopInfoID);
40 AU.addPreservedID(MachineDominatorsID);
41 MachineFunctionPass::getAnalysisUsage(AU);
42 }
43
44 const X86Subtarget *STI;
45 const X86InstrInfo *TII;
46 const X86RegisterInfo *TRI;
47 const X86MachineFunctionInfo *X86FI;
48 const X86FrameLowering *X86FL;
49
50 bool runOnMachineFunction(MachineFunction &Fn) override;
51
52 MachineFunctionProperties getRequiredProperties() const override {
53 return MachineFunctionProperties().set(
54 MachineFunctionProperties::Property::NoVRegs);
55 }
56
57 StringRef getPassName() const override {
58 return "X86 pseudo instruction expansion pass";
59 }
60
61private:
62 void ExpandICallBranchFunnel(MachineBasicBlock *MBB,
63 MachineBasicBlock::iterator MBBI);
64
65 bool ExpandMI(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI);
66 bool ExpandMBB(MachineBasicBlock &MBB);
67};
68char X86ExpandPseudo::ID = 0;
69} // End anonymous namespace.
70
71void X86ExpandPseudo::ExpandICallBranchFunnel(
72 MachineBasicBlock *MBB, MachineBasicBlock::iterator MBBI) {
73 MachineBasicBlock *JTMBB = MBB;
74 MachineInstr *JTInst = &*MBBI;
75 MachineFunction *MF = MBB->getParent();
76 const BasicBlock *BB = MBB->getBasicBlock();
77 auto InsPt = MachineFunction::iterator(MBB);
78 ++InsPt;
79
80 std::vector<std::pair<MachineBasicBlock *, unsigned>> TargetMBBs;
81 DebugLoc DL = JTInst->getDebugLoc();
82 MachineOperand Selector = JTInst->getOperand(0);
83 const GlobalValue *CombinedGlobal = JTInst->getOperand(1).getGlobal();
84
85 auto CmpTarget = [&](unsigned Target) {
86 BuildMI(*MBB, MBBI, DL, TII->get(X86::LEA64r), X86::R11)
87 .addReg(X86::RIP)
88 .addImm(1)
89 .addReg(0)
90 .addGlobalAddress(CombinedGlobal,
91 JTInst->getOperand(2 + 2 * Target).getImm())
92 .addReg(0);
93 BuildMI(*MBB, MBBI, DL, TII->get(X86::CMP64rr))
94 .add(Selector)
95 .addReg(X86::R11);
96 };
97
98 auto CreateMBB = [&]() {
99 auto *NewMBB = MF->CreateMachineBasicBlock(BB);
100 MBB->addSuccessor(NewMBB);
101 return NewMBB;
102 };
103
104 auto EmitCondJump = [&](unsigned Opcode, MachineBasicBlock *ThenMBB) {
105 BuildMI(*MBB, MBBI, DL, TII->get(Opcode)).addMBB(ThenMBB);
106
107 auto *ElseMBB = CreateMBB();
108 MF->insert(InsPt, ElseMBB);
109 MBB = ElseMBB;
110 MBBI = MBB->end();
111 };
112
113 auto EmitCondJumpTarget = [&](unsigned Opcode, unsigned Target) {
114 auto *ThenMBB = CreateMBB();
115 TargetMBBs.push_back({ThenMBB, Target});
116 EmitCondJump(Opcode, ThenMBB);
117 };
118
119 auto EmitTailCall = [&](unsigned Target) {
120 BuildMI(*MBB, MBBI, DL, TII->get(X86::TAILJMPd64))
121 .add(JTInst->getOperand(3 + 2 * Target));
122 };
123
124 std::function<void(unsigned, unsigned)> EmitBranchFunnel =
125 [&](unsigned FirstTarget, unsigned NumTargets) {
3
←
Calling constructor for 'function'
→
10
←
Returning from constructor for 'function'
→
126 if (NumTargets == 1) {
127 EmitTailCall(FirstTarget);
128 return;
129 }
130
131 if (NumTargets == 2) {
132 CmpTarget(FirstTarget + 1);
133 EmitCondJumpTarget(X86::JB_1, FirstTarget);
134 EmitTailCall(FirstTarget + 1);
135 return;
136 }
137
138 if (NumTargets < 6) {
139 CmpTarget(FirstTarget + 1);
140 EmitCondJumpTarget(X86::JB_1, FirstTarget);
141 EmitCondJumpTarget(X86::JE_1, FirstTarget + 1);
142 EmitBranchFunnel(FirstTarget + 2, NumTargets - 2);
143 return;
144 }
145
146 auto *ThenMBB = CreateMBB();
147 CmpTarget(FirstTarget + (NumTargets / 2));
148 EmitCondJump(X86::JB_1, ThenMBB);
149 EmitCondJumpTarget(X86::JE_1, FirstTarget + (NumTargets / 2));
150 EmitBranchFunnel(FirstTarget + (NumTargets / 2) + 1,
151 NumTargets - (NumTargets / 2) - 1);
152
153 MF->insert(InsPt, ThenMBB);
154 MBB = ThenMBB;
155 MBBI = MBB->end();
156 EmitBranchFunnel(FirstTarget, NumTargets / 2);
157 };
158
159 EmitBranchFunnel(0, (JTInst->getNumOperands() - 2) / 2);
160 for (auto P : TargetMBBs) {
161 MF->insert(InsPt, P.first);
162 BuildMI(P.first, DL, TII->get(X86::TAILJMPd64))
163 .add(JTInst->getOperand(3 + 2 * P.second));
164 }
165 JTMBB->erase(JTInst);
166}
11
←
Potential memory leak
167
168/// If \p MBBI is a pseudo instruction, this method expands
169/// it to the corresponding (sequence of) actual instruction(s).
170/// \returns true if \p MBBI has been expanded.
171bool X86ExpandPseudo::ExpandMI(MachineBasicBlock &MBB,
172 MachineBasicBlock::iterator MBBI) {
173 MachineInstr &MI = *MBBI;
174 unsigned Opcode = MI.getOpcode();
175 DebugLoc DL = MBBI->getDebugLoc();
176 switch (Opcode) {
1
Control jumps to 'case ICALL_BRANCH_FUNNEL:' at line 362
→
177 default:
178 return false;
179 case X86::TCRETURNdi:
180 case X86::TCRETURNdicc:
181 case X86::TCRETURNri:
182 case X86::TCRETURNmi:
183 case X86::TCRETURNdi64:
184 case X86::TCRETURNdi64cc:
185 case X86::TCRETURNri64:
186 case X86::TCRETURNmi64: {
187 bool isMem = Opcode == X86::TCRETURNmi || Opcode == X86::TCRETURNmi64;
188 MachineOperand &JumpTarget = MBBI->getOperand(0);
189 MachineOperand &StackAdjust = MBBI->getOperand(isMem ? 5 : 1);
190 assert(StackAdjust.isImm() && "Expecting immediate value.")(static_cast <bool> (StackAdjust.isImm() && "Expecting immediate value."
) ? void (0) : __assert_fail ("StackAdjust.isImm() && \"Expecting immediate value.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/X86/X86ExpandPseudo.cpp"
, 190, __extension__ __PRETTY_FUNCTION__));
191
192 // Adjust stack pointer.
193 int StackAdj = StackAdjust.getImm();
194 int MaxTCDelta = X86FI->getTCReturnAddrDelta();
195 int Offset = 0;
196 assert(MaxTCDelta <= 0 && "MaxTCDelta should never be positive")(static_cast <bool> (MaxTCDelta <= 0 && "MaxTCDelta should never be positive"
) ? void (0) : __assert_fail ("MaxTCDelta <= 0 && \"MaxTCDelta should never be positive\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/X86/X86ExpandPseudo.cpp"
, 196, __extension__ __PRETTY_FUNCTION__));
197
198 // Incoporate the retaddr area.
199 Offset = StackAdj - MaxTCDelta;
200 assert(Offset >= 0 && "Offset should never be negative")(static_cast <bool> (Offset >= 0 && "Offset should never be negative"
) ? void (0) : __assert_fail ("Offset >= 0 && \"Offset should never be negative\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/X86/X86ExpandPseudo.cpp"
, 200, __extension__ __PRETTY_FUNCTION__));
201
202 if (Opcode == X86::TCRETURNdicc || Opcode == X86::TCRETURNdi64cc) {
203 assert(Offset == 0 && "Conditional tail call cannot adjust the stack.")(static_cast <bool> (Offset == 0 && "Conditional tail call cannot adjust the stack."
) ? void (0) : __assert_fail ("Offset == 0 && \"Conditional tail call cannot adjust the stack.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/X86/X86ExpandPseudo.cpp"
, 203, __extension__ __PRETTY_FUNCTION__));
204 }
205
206 if (Offset) {
207 // Check for possible merge with preceding ADD instruction.
208 Offset += X86FL->mergeSPUpdates(MBB, MBBI, true);
209 X86FL->emitSPUpdate(MBB, MBBI, DL, Offset, /*InEpilogue=*/true);
210 }
211
212 // Jump to label or value in register.
213 bool IsWin64 = STI->isTargetWin64();
214 if (Opcode == X86::TCRETURNdi || Opcode == X86::TCRETURNdicc ||
215 Opcode == X86::TCRETURNdi64 || Opcode == X86::TCRETURNdi64cc) {
216 unsigned Op;
217 switch (Opcode) {
218 case X86::TCRETURNdi:
219 Op = X86::TAILJMPd;
220 break;
221 case X86::TCRETURNdicc:
222 Op = X86::TAILJMPd_CC;
223 break;
224 case X86::TCRETURNdi64cc:
225 assert(!MBB.getParent()->hasWinCFI() &&(static_cast <bool> (!MBB.getParent()->hasWinCFI() &&
"Conditional tail calls confuse " "the Win64 unwinder.") ? void
(0) : __assert_fail ("!MBB.getParent()->hasWinCFI() && \"Conditional tail calls confuse \" \"the Win64 unwinder.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/X86/X86ExpandPseudo.cpp"
, 227, __extension__ __PRETTY_FUNCTION__))
226 "Conditional tail calls confuse "(static_cast <bool> (!MBB.getParent()->hasWinCFI() &&
"Conditional tail calls confuse " "the Win64 unwinder.") ? void
(0) : __assert_fail ("!MBB.getParent()->hasWinCFI() && \"Conditional tail calls confuse \" \"the Win64 unwinder.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/X86/X86ExpandPseudo.cpp"
, 227, __extension__ __PRETTY_FUNCTION__))
227 "the Win64 unwinder.")(static_cast <bool> (!MBB.getParent()->hasWinCFI() &&
"Conditional tail calls confuse " "the Win64 unwinder.") ? void
(0) : __assert_fail ("!MBB.getParent()->hasWinCFI() && \"Conditional tail calls confuse \" \"the Win64 unwinder.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/X86/X86ExpandPseudo.cpp"
, 227, __extension__ __PRETTY_FUNCTION__));
228 Op = X86::TAILJMPd64_CC;
229 break;
230 default:
231 // Note: Win64 uses REX prefixes indirect jumps out of functions, but
232 // not direct ones.
233 Op = X86::TAILJMPd64;
234 break;
235 }
236 MachineInstrBuilder MIB = BuildMI(MBB, MBBI, DL, TII->get(Op));
237 if (JumpTarget.isGlobal()) {
238 MIB.addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset(),
239 JumpTarget.getTargetFlags());
240 } else {
241 assert(JumpTarget.isSymbol())(static_cast <bool> (JumpTarget.isSymbol()) ? void (0) :
__assert_fail ("JumpTarget.isSymbol()", "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/X86/X86ExpandPseudo.cpp"
, 241, __extension__ __PRETTY_FUNCTION__));
242 MIB.addExternalSymbol(JumpTarget.getSymbolName(),
243 JumpTarget.getTargetFlags());
244 }
245 if (Op == X86::TAILJMPd_CC || Op == X86::TAILJMPd64_CC) {
246 MIB.addImm(MBBI->getOperand(2).getImm());
247 }
248
249 } else if (Opcode == X86::TCRETURNmi || Opcode == X86::TCRETURNmi64) {
250 unsigned Op = (Opcode == X86::TCRETURNmi)
251 ? X86::TAILJMPm
252 : (IsWin64 ? X86::TAILJMPm64_REX : X86::TAILJMPm64);
253 MachineInstrBuilder MIB = BuildMI(MBB, MBBI, DL, TII->get(Op));
254 for (unsigned i = 0; i != 5; ++i)
255 MIB.add(MBBI->getOperand(i));
256 } else if (Opcode == X86::TCRETURNri64) {
257 BuildMI(MBB, MBBI, DL,
258 TII->get(IsWin64 ? X86::TAILJMPr64_REX : X86::TAILJMPr64))
259 .addReg(JumpTarget.getReg(), RegState::Kill);
260 } else {
261 BuildMI(MBB, MBBI, DL, TII->get(X86::TAILJMPr))
262 .addReg(JumpTarget.getReg(), RegState::Kill);
263 }
264
265 MachineInstr &NewMI = *std::prev(MBBI);
266 NewMI.copyImplicitOps(*MBBI->getParent()->getParent(), *MBBI);
267
268 // Delete the pseudo instruction TCRETURN.
269 MBB.erase(MBBI);
270
271 return true;
272 }
273 case X86::EH_RETURN:
274 case X86::EH_RETURN64: {
275 MachineOperand &DestAddr = MBBI->getOperand(0);
276 assert(DestAddr.isReg() && "Offset should be in register!")(static_cast <bool> (DestAddr.isReg() && "Offset should be in register!"
) ? void (0) : __assert_fail ("DestAddr.isReg() && \"Offset should be in register!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/X86/X86ExpandPseudo.cpp"
, 276, __extension__ __PRETTY_FUNCTION__));
277 const bool Uses64BitFramePtr =
278 STI->isTarget64BitLP64() || STI->isTargetNaCl64();
279 unsigned StackPtr = TRI->getStackRegister();
280 BuildMI(MBB, MBBI, DL,
281 TII->get(Uses64BitFramePtr ? X86::MOV64rr : X86::MOV32rr), StackPtr)
282 .addReg(DestAddr.getReg());
283 // The EH_RETURN pseudo is really removed during the MC Lowering.
284 return true;
285 }
286 case X86::IRET: {
287 // Adjust stack to erase error code
288 int64_t StackAdj = MBBI->getOperand(0).getImm();
289 X86FL->emitSPUpdate(MBB, MBBI, DL, StackAdj, true);
290 // Replace pseudo with machine iret
291 BuildMI(MBB, MBBI, DL,
292 TII->get(STI->is64Bit() ? X86::IRET64 : X86::IRET32));
293 MBB.erase(MBBI);
294 return true;
295 }
296 case X86::RET: {
297 // Adjust stack to erase error code
298 int64_t StackAdj = MBBI->getOperand(0).getImm();
299 MachineInstrBuilder MIB;
300 if (StackAdj == 0) {
301 MIB = BuildMI(MBB, MBBI, DL,
302 TII->get(STI->is64Bit() ? X86::RETQ : X86::RETL));
303 } else if (isUInt<16>(StackAdj)) {
304 MIB = BuildMI(MBB, MBBI, DL,
305 TII->get(STI->is64Bit() ? X86::RETIQ : X86::RETIL))
306 .addImm(StackAdj);
307 } else {
308 assert(!STI->is64Bit() &&(static_cast <bool> (!STI->is64Bit() && "shouldn't need to do this for x86_64 targets!"
) ? void (0) : __assert_fail ("!STI->is64Bit() && \"shouldn't need to do this for x86_64 targets!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/X86/X86ExpandPseudo.cpp"
, 309, __extension__ __PRETTY_FUNCTION__))
309 "shouldn't need to do this for x86_64 targets!")(static_cast <bool> (!STI->is64Bit() && "shouldn't need to do this for x86_64 targets!"
) ? void (0) : __assert_fail ("!STI->is64Bit() && \"shouldn't need to do this for x86_64 targets!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/X86/X86ExpandPseudo.cpp"
, 309, __extension__ __PRETTY_FUNCTION__));
310 // A ret can only handle immediates as big as 2**16-1. If we need to pop
311 // off bytes before the return address, we must do it manually.
312 BuildMI(MBB, MBBI, DL, TII->get(X86::POP32r)).addReg(X86::ECX, RegState::Define);
313 X86FL->emitSPUpdate(MBB, MBBI, DL, StackAdj, /*InEpilogue=*/true);
314 BuildMI(MBB, MBBI, DL, TII->get(X86::PUSH32r)).addReg(X86::ECX);
315 MIB = BuildMI(MBB, MBBI, DL, TII->get(X86::RETL));
316 }
317 for (unsigned I = 1, E = MBBI->getNumOperands(); I != E; ++I)
318 MIB.add(MBBI->getOperand(I));
319 MBB.erase(MBBI);
320 return true;
321 }
322 case X86::EH_RESTORE: {
323 // Restore ESP and EBP, and optionally ESI if required.
324 bool IsSEH = isAsynchronousEHPersonality(classifyEHPersonality(
325 MBB.getParent()->getFunction().getPersonalityFn()));
326 X86FL->restoreWin32EHStackPointers(MBB, MBBI, DL, /*RestoreSP=*/IsSEH);
327 MBBI->eraseFromParent();
328 return true;
329 }
330 case X86::LCMPXCHG8B_SAVE_EBX:
331 case X86::LCMPXCHG16B_SAVE_RBX: {
332 // Perform the following transformation.
333 // SaveRbx = pseudocmpxchg Addr, <4 opds for the address>, InArg, SaveRbx
334 // =>
335 // [E|R]BX = InArg
336 // actualcmpxchg Addr
337 // [E|R]BX = SaveRbx
338 const MachineOperand &InArg = MBBI->getOperand(6);
339 unsigned SaveRbx = MBBI->getOperand(7).getReg();
340
341 unsigned ActualInArg =
342 Opcode == X86::LCMPXCHG8B_SAVE_EBX ? X86::EBX : X86::RBX;
343 // Copy the input argument of the pseudo into the argument of the
344 // actual instruction.
345 TII->copyPhysReg(MBB, MBBI, DL, ActualInArg, InArg.getReg(),
346 InArg.isKill());
347 // Create the actual instruction.
348 unsigned ActualOpc =
349 Opcode == X86::LCMPXCHG8B_SAVE_EBX ? X86::LCMPXCHG8B : X86::LCMPXCHG16B;
350 MachineInstr *NewInstr = BuildMI(MBB, MBBI, DL, TII->get(ActualOpc));
351 // Copy the operands related to the address.
352 for (unsigned Idx = 1; Idx < 6; ++Idx)
353 NewInstr->addOperand(MBBI->getOperand(Idx));
354 // Finally, restore the value of RBX.
355 TII->copyPhysReg(MBB, MBBI, DL, ActualInArg, SaveRbx,
356 /*SrcIsKill*/ true);
357
358 // Delete the pseudo.
359 MBBI->eraseFromParent();
360 return true;
361 }
362 case TargetOpcode::ICALL_BRANCH_FUNNEL:
363 ExpandICallBranchFunnel(&MBB, MBBI);
2
←
Calling 'X86ExpandPseudo::ExpandICallBranchFunnel'
→
364 return true;
365 }
366 llvm_unreachable("Previous switch has a fallthrough?")::llvm::llvm_unreachable_internal("Previous switch has a fallthrough?"
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/X86/X86ExpandPseudo.cpp"
, 366);
367}
368
369/// Expand all pseudo instructions contained in \p MBB.
370/// \returns true if any expansion occurred for \p MBB.
371bool X86ExpandPseudo::ExpandMBB(MachineBasicBlock &MBB) {
372 bool Modified = false;
373
374 // MBBI may be invalidated by the expansion.
375 MachineBasicBlock::iterator MBBI = MBB.begin(), E = MBB.end();
376 while (MBBI != E) {
377 MachineBasicBlock::iterator NMBBI = std::next(MBBI);
378 Modified |= ExpandMI(MBB, MBBI);
379 MBBI = NMBBI;
380 }
381
382 return Modified;
383}
384
385bool X86ExpandPseudo::runOnMachineFunction(MachineFunction &MF) {
386 STI = &static_cast<const X86Subtarget &>(MF.getSubtarget());
387 TII = STI->getInstrInfo();
388 TRI = STI->getRegisterInfo();
389 X86FI = MF.getInfo<X86MachineFunctionInfo>();
390 X86FL = STI->getFrameLowering();
391
392 bool Modified = false;
393 for (MachineBasicBlock &MBB : MF)
394 Modified |= ExpandMBB(MBB);
395 return Modified;
396}
397
398/// Returns an instance of the pseudo instruction expansion pass.
399FunctionPass *llvm::createX86ExpandPseudoPass() {
400 return new X86ExpandPseudo();
401}
←

/usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0/bits/std_function.h

1// Implementation of std::function -*- C++ -*-
2
3// Copyright (C) 2004-2017 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library. This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 3, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14// GNU General Public License for more details.
15
16// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23// <http://www.gnu.org/licenses/>.
24
25/** @file include/bits/function.h
26 * This is an internal header file, included by other library headers.
27 * Do not attempt to use it directly. @headername{functional}
28 */
29
30#ifndef _GLIBCXX_STD_FUNCTION_H1
31#define _GLIBCXX_STD_FUNCTION_H1 1
32
33#pragma GCC system_header
34
35#if __cplusplus201103L < 201103L
36# include <bits/c++0x_warning.h>
37#else
38
39#if __cpp_rtti199711
40# include <typeinfo>
41#endif
42#include <bits/stl_function.h>
43#include <bits/invoke.h>
44#include <bits/refwrap.h>
45#include <bits/functexcept.h>
46
47namespace std _GLIBCXX_VISIBILITY(default)__attribute__ ((__visibility__ ("default")))
48{
49_GLIBCXX_BEGIN_NAMESPACE_VERSION
50
51 /**
52 * Derives from @c unary_function or @c binary_function, or perhaps
53 * nothing, depending on the number of arguments provided. The
54 * primary template is the basis case, which derives nothing.
55 */
56 template<typename _Res, typename... _ArgTypes>
57 struct _Maybe_unary_or_binary_function { };
58
59 /// Derives from @c unary_function, as appropriate.
60 template<typename _Res, typename _T1>
61 struct _Maybe_unary_or_binary_function<_Res, _T1>
62 : std::unary_function<_T1, _Res> { };
63
64 /// Derives from @c binary_function, as appropriate.
65 template<typename _Res, typename _T1, typename _T2>
66 struct _Maybe_unary_or_binary_function<_Res, _T1, _T2>
67 : std::binary_function<_T1, _T2, _Res> { };
68
69
70 /**
71 * @brief Exception class thrown when class template function's
72 * operator() is called with an empty target.
73 * @ingroup exceptions
74 */
75 class bad_function_call : public std::exception
76 {
77 public:
78 virtual ~bad_function_call() noexcept;
79
80 const char* what() const noexcept;
81 };
82
83 /**
84 * Trait identifying "location-invariant" types, meaning that the
85 * address of the object (or any of its members) will not escape.
86 * Trivially copyable types are location-invariant and users can
87 * specialize this trait for other types.
88 */
89 template<typename _Tp>
90 struct __is_location_invariant
91 : is_trivially_copyable<_Tp>::type
92 { };
93
94 class _Undefined_class;
95
96 union _Nocopy_types
97 {
98 void* _M_object;
99 const void* _M_const_object;
100 void (*_M_function_pointer)();
101 void (_Undefined_class::*_M_member_pointer)();
102 };
103
104 union [[gnu::may_alias]] _Any_data
105 {
106 void* _M_access() { return &_M_pod_data[0]; }
107 const void* _M_access() const { return &_M_pod_data[0]; }
108
109 template<typename _Tp>
110 _Tp&
111 _M_access()
112 { return *static_cast<_Tp*>(_M_access()); }
113
114 template<typename _Tp>
115 const _Tp&
116 _M_access() const
117 { return *static_cast<const _Tp*>(_M_access()); }
118
119 _Nocopy_types _M_unused;
120 char _M_pod_data[sizeof(_Nocopy_types)];
121 };
122
123 enum _Manager_operation
124 {
125 __get_type_info,
126 __get_functor_ptr,
127 __clone_functor,
128 __destroy_functor
129 };
130
131 // Simple type wrapper that helps avoid annoying const problems
132 // when casting between void pointers and pointers-to-pointers.
133 template<typename _Tp>
134 struct _Simple_type_wrapper
135 {
136 _Simple_type_wrapper(_Tp __value) : __value(__value) { }
137
138 _Tp __value;
139 };
140
141 template<typename _Tp>
142 struct __is_location_invariant<_Simple_type_wrapper<_Tp> >
143 : __is_location_invariant<_Tp>
144 { };
145
146 template<typename _Signature>
147 class function;
148
149 /// Base class of all polymorphic function object wrappers.
150 class _Function_base
151 {
152 public:
153 static const std::size_t _M_max_size = sizeof(_Nocopy_types);
154 static const std::size_t _M_max_align = __alignof__(_Nocopy_types);
155
156 template<typename _Functor>
157 class _Base_manager
158 {
159 protected:
160 static const bool __stored_locally =
161 (__is_location_invariant<_Functor>::value
162 && sizeof(_Functor) <= _M_max_size
163 && __alignof__(_Functor) <= _M_max_align
164 && (_M_max_align % __alignof__(_Functor) == 0));
165
166 typedef integral_constant<bool, __stored_locally> _Local_storage;
167
168 // Retrieve a pointer to the function object
169 static _Functor*
170 _M_get_pointer(const _Any_data& __source)
171 {
172 const _Functor* __ptr =
173 __stored_locally? std::__addressof(__source._M_access<_Functor>())
174 /* have stored a pointer */ : __source._M_access<_Functor*>();
175 return const_cast<_Functor*>(__ptr);
176 }
177
178 // Clone a location-invariant function object that fits within
179 // an _Any_data structure.
180 static void
181 _M_clone(_Any_data& __dest, const _Any_data& __source, true_type)
182 {
183 ::new (__dest._M_access()) _Functor(__source._M_access<_Functor>());
184 }
185
186 // Clone a function object that is not location-invariant or
187 // that cannot fit into an _Any_data structure.
188 static void
189 _M_clone(_Any_data& __dest, const _Any_data& __source, false_type)
190 {
191 __dest._M_access<_Functor*>() =
192 new _Functor(*__source._M_access<_Functor*>());
193 }
194
195 // Destroying a location-invariant object may still require
196 // destruction.
197 static void
198 _M_destroy(_Any_data& __victim, true_type)
199 {
200 __victim._M_access<_Functor>().~_Functor();
201 }
202
203 // Destroying an object located on the heap.
204 static void
205 _M_destroy(_Any_data& __victim, false_type)
206 {
207 delete __victim._M_access<_Functor*>();
208 }
209
210 public:
211 static bool
212 _M_manager(_Any_data& __dest, const _Any_data& __source,
213 _Manager_operation __op)
214 {
215 switch (__op)
216 {
217#if __cpp_rtti199711
218 case __get_type_info:
219 __dest._M_access<const type_info*>() = &typeid(_Functor);
220 break;
221#endif
222 case __get_functor_ptr:
223 __dest._M_access<_Functor*>() = _M_get_pointer(__source);
224 break;
225
226 case __clone_functor:
227 _M_clone(__dest, __source, _Local_storage());
228 break;
229
230 case __destroy_functor:
231 _M_destroy(__dest, _Local_storage());
232 break;
233 }
234 return false;
235 }
236
237 static void
238 _M_init_functor(_Any_data& __functor, _Functor&& __f)
239 { _M_init_functor(__functor, std::move(__f), _Local_storage()); }
6
←
Calling '_Base_manager::_M_init_functor'
→
8
←
Returned allocated memory
→
240
241 template<typename _Signature>
242 static bool
243 _M_not_empty_function(const function<_Signature>& __f)
244 { return static_cast<bool>(__f); }
245
246 template<typename _Tp>
247 static bool
248 _M_not_empty_function(_Tp* __fp)
249 { return __fp != nullptr; }
250
251 template<typename _Class, typename _Tp>
252 static bool
253 _M_not_empty_function(_Tp _Class::* __mp)
254 { return __mp != nullptr; }
255
256 template<typename _Tp>
257 static bool
258 _M_not_empty_function(const _Tp&)
259 { return true; }
260
261 private:
262 static void
263 _M_init_functor(_Any_data& __functor, _Functor&& __f, true_type)
264 { ::new (__functor._M_access()) _Functor(std::move(__f)); }
265
266 static void
267 _M_init_functor(_Any_data& __functor, _Functor&& __f, false_type)
268 { __functor._M_access<_Functor*>() = new _Functor(std::move(__f)); }
7
←
Memory is allocated
→
269 };
270
271 _Function_base() : _M_manager(nullptr) { }
272
273 ~_Function_base()
274 {
275 if (_M_manager)
276 _M_manager(_M_functor, _M_functor, __destroy_functor);
277 }
278
279 bool _M_empty() const { return !_M_manager; }
280
281 typedef bool (*_Manager_type)(_Any_data&, const _Any_data&,
282 _Manager_operation);
283
284 _Any_data _M_functor;
285 _Manager_type _M_manager;
286 };
287
288 template<typename _Signature, typename _Functor>
289 class _Function_handler;
290
291 template<typename _Res, typename _Functor, typename... _ArgTypes>
292 class _Function_handler<_Res(_ArgTypes...), _Functor>
293 : public _Function_base::_Base_manager<_Functor>
294 {
295 typedef _Function_base::_Base_manager<_Functor> _Base;
296
297 public:
298 static _Res
299 _M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
300 {
301 return (*_Base::_M_get_pointer(__functor))(
302 std::forward<_ArgTypes>(__args)...);
303 }
304 };
305
306 template<typename _Functor, typename... _ArgTypes>
307 class _Function_handler<void(_ArgTypes...), _Functor>
308 : public _Function_base::_Base_manager<_Functor>
309 {
310 typedef _Function_base::_Base_manager<_Functor> _Base;
311
312 public:
313 static void
314 _M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
315 {
316 (*_Base::_M_get_pointer(__functor))(
317 std::forward<_ArgTypes>(__args)...);
318 }
319 };
320
321 template<typename _Class, typename _Member, typename _Res,
322 typename... _ArgTypes>
323 class _Function_handler<_Res(_ArgTypes...), _Member _Class::*>
324 : public _Function_handler<void(_ArgTypes...), _Member _Class::*>
325 {
326 typedef _Function_handler<void(_ArgTypes...), _Member _Class::*>
327 _Base;
328
329 public:
330 static _Res
331 _M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
332 {
333 return std::__invoke(_Base::_M_get_pointer(__functor)->__value,
334 std::forward<_ArgTypes>(__args)...);
335 }
336 };
337
338 template<typename _Class, typename _Member, typename... _ArgTypes>
339 class _Function_handler<void(_ArgTypes...), _Member _Class::*>
340 : public _Function_base::_Base_manager<
341 _Simple_type_wrapper< _Member _Class::* > >
342 {
343 typedef _Member _Class::* _Functor;
344 typedef _Simple_type_wrapper<_Functor> _Wrapper;
345 typedef _Function_base::_Base_manager<_Wrapper> _Base;
346
347 public:
348 static bool
349 _M_manager(_Any_data& __dest, const _Any_data& __source,
350 _Manager_operation __op)
351 {
352 switch (__op)
353 {
354#if __cpp_rtti199711
355 case __get_type_info:
356 __dest._M_access<const type_info*>() = &typeid(_Functor);
357 break;
358#endif
359 case __get_functor_ptr:
360 __dest._M_access<_Functor*>() =
361 &_Base::_M_get_pointer(__source)->__value;
362 break;
363
364 default:
365 _Base::_M_manager(__dest, __source, __op);
366 }
367 return false;
368 }
369
370 static void
371 _M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
372 {
373 std::__invoke(_Base::_M_get_pointer(__functor)->__value,
374 std::forward<_ArgTypes>(__args)...);
375 }
376 };
377
378 template<typename _From, typename _To>
379 using __check_func_return_type
380 = __or_<is_void<_To>, is_same<_From, _To>, is_convertible<_From, _To>>;
381
382 /**
383 * @brief Primary class template for std::function.
384 * @ingroup functors
385 *
386 * Polymorphic function wrapper.
387 */
388 template<typename _Res, typename... _ArgTypes>
389 class function<_Res(_ArgTypes...)>
390 : public _Maybe_unary_or_binary_function<_Res, _ArgTypes...>,
391 private _Function_base
392 {
393 template<typename _Func,
394 typename _Res2 = typename result_of<_Func&(_ArgTypes...)>::type>
395 struct _Callable : __check_func_return_type<_Res2, _Res> { };
396
397 // Used so the return type convertibility checks aren't done when
398 // performing overload resolution for copy construction/assignment.
399 template<typename _Tp>
400 struct _Callable<function, _Tp> : false_type { };
401
402 template<typename _Cond, typename _Tp>
403 using _Requires = typename enable_if<_Cond::value, _Tp>::type;
404
405 public:
406 typedef _Res result_type;
407
408 // [3.7.2.1] construct/copy/destroy
409
410 /**
411 * @brief Default construct creates an empty function call wrapper.
412 * @post @c !(bool)*this
413 */
414 function() noexcept
415 : _Function_base() { }
416
417 /**
418 * @brief Creates an empty function call wrapper.
419 * @post @c !(bool)*this
420 */
421 function(nullptr_t) noexcept
422 : _Function_base() { }
423
424 /**
425 * @brief %Function copy constructor.
426 * @param __x A %function object with identical call signature.
427 * @post @c bool(*this) == bool(__x)
428 *
429 * The newly-created %function contains a copy of the target of @a
430 * __x (if it has one).
431 */
432 function(const function& __x);
433
434 /**
435 * @brief %Function move constructor.
436 * @param __x A %function object rvalue with identical call signature.
437 *
438 * The newly-created %function contains the target of @a __x
439 * (if it has one).
440 */
441 function(function&& __x) noexcept : _Function_base()
442 {
443 __x.swap(*this);
444 }
445
446 /**
447 * @brief Builds a %function that targets a copy of the incoming
448 * function object.
449 * @param __f A %function object that is callable with parameters of
450 * type @c T1, @c T2, ..., @c TN and returns a value convertible
451 * to @c Res.
452 *
453 * The newly-created %function object will target a copy of
454 * @a __f. If @a __f is @c reference_wrapper<F>, then this function
455 * object will contain a reference to the function object @c
456 * __f.get(). If @a __f is a NULL function pointer or NULL
457 * pointer-to-member, the newly-created object will be empty.
458 *
459 * If @a __f is a non-NULL function pointer or an object of type @c
460 * reference_wrapper<F>, this function will not throw.
461 */
462 template<typename _Functor,
463 typename = _Requires<__not_<is_same<_Functor, function>>, void>,
464 typename = _Requires<_Callable<_Functor>, void>>
465 function(_Functor);
466
467 /**
468 * @brief %Function assignment operator.
469 * @param __x A %function with identical call signature.
470 * @post @c (bool)*this == (bool)x
471 * @returns @c *this
472 *
473 * The target of @a __x is copied to @c *this. If @a __x has no
474 * target, then @c *this will be empty.
475 *
476 * If @a __x targets a function pointer or a reference to a function
477 * object, then this operation will not throw an %exception.
478 */
479 function&
480 operator=(const function& __x)
481 {
482 function(__x).swap(*this);
483 return *this;
484 }
485
486 /**
487 * @brief %Function move-assignment operator.
488 * @param __x A %function rvalue with identical call signature.
489 * @returns @c *this
490 *
491 * The target of @a __x is moved to @c *this. If @a __x has no
492 * target, then @c *this will be empty.
493 *
494 * If @a __x targets a function pointer or a reference to a function
495 * object, then this operation will not throw an %exception.
496 */
497 function&
498 operator=(function&& __x) noexcept
499 {
500 function(std::move(__x)).swap(*this);
501 return *this;
502 }
503
504 /**
505 * @brief %Function assignment to zero.
506 * @post @c !(bool)*this
507 * @returns @c *this
508 *
509 * The target of @c *this is deallocated, leaving it empty.
510 */
511 function&
512 operator=(nullptr_t) noexcept
513 {
514 if (_M_manager)
515 {
516 _M_manager(_M_functor, _M_functor, __destroy_functor);
517 _M_manager = nullptr;
518 _M_invoker = nullptr;
519 }
520 return *this;
521 }
522
523 /**
524 * @brief %Function assignment to a new target.
525 * @param __f A %function object that is callable with parameters of
526 * type @c T1, @c T2, ..., @c TN and returns a value convertible
527 * to @c Res.
528 * @return @c *this
529 *
530 * This %function object wrapper will target a copy of @a
531 * __f. If @a __f is @c reference_wrapper<F>, then this function
532 * object will contain a reference to the function object @c
533 * __f.get(). If @a __f is a NULL function pointer or NULL
534 * pointer-to-member, @c this object will be empty.
535 *
536 * If @a __f is a non-NULL function pointer or an object of type @c
537 * reference_wrapper<F>, this function will not throw.
538 */
539 template<typename _Functor>
540 _Requires<_Callable<typename decay<_Functor>::type>, function&>
541 operator=(_Functor&& __f)
542 {
543 function(std::forward<_Functor>(__f)).swap(*this);
544 return *this;
545 }
546
547 /// @overload
548 template<typename _Functor>
549 function&
550 operator=(reference_wrapper<_Functor> __f) noexcept
551 {
552 function(__f).swap(*this);
553 return *this;
554 }
555
556 // [3.7.2.2] function modifiers
557
558 /**
559 * @brief Swap the targets of two %function objects.
560 * @param __x A %function with identical call signature.
561 *
562 * Swap the targets of @c this function object and @a __f. This
563 * function will not throw an %exception.
564 */
565 void swap(function& __x) noexcept
566 {
567 std::swap(_M_functor, __x._M_functor);
568 std::swap(_M_manager, __x._M_manager);
569 std::swap(_M_invoker, __x._M_invoker);
570 }
571
572 // [3.7.2.3] function capacity
573
574 /**
575 * @brief Determine if the %function wrapper has a target.
576 *
577 * @return @c true when this %function object contains a target,
578 * or @c false when it is empty.
579 *
580 * This function will not throw an %exception.
581 */
582 explicit operator bool() const noexcept
583 { return !_M_empty(); }
584
585 // [3.7.2.4] function invocation
586
587 /**
588 * @brief Invokes the function targeted by @c *this.
589 * @returns the result of the target.
590 * @throws bad_function_call when @c !(bool)*this
591 *
592 * The function call operator invokes the target function object
593 * stored by @c this.
594 */
595 _Res operator()(_ArgTypes... __args) const;
596
597#if __cpp_rtti199711
598 // [3.7.2.5] function target access
599 /**
600 * @brief Determine the type of the target of this function object
601 * wrapper.
602 *
603 * @returns the type identifier of the target function object, or
604 * @c typeid(void) if @c !(bool)*this.
605 *
606 * This function will not throw an %exception.
607 */
608 const type_info& target_type() const noexcept;
609
610 /**
611 * @brief Access the stored target function object.
612 *
613 * @return Returns a pointer to the stored target function object,
614 * if @c typeid(_Functor).equals(target_type()); otherwise, a NULL
615 * pointer.
616 *
617 * This function does not throw exceptions.
618 *
619 * @{
620 */
621 template<typename _Functor> _Functor* target() noexcept;
622
623 template<typename _Functor> const _Functor* target() const noexcept;
624 // @}
625#endif
626
627 private:
628 using _Invoker_type = _Res (*)(const _Any_data&, _ArgTypes&&...);
629 _Invoker_type _M_invoker;
630 };
631
632#if __cpp_deduction_guides >= 201606
633 template<typename>
634 struct __function_guide_helper
635 { };
636
637 template<typename _Res, typename _Tp, bool _Nx, typename... _Args>
638 struct __function_guide_helper<
639 _Res (_Tp::*) (_Args...) noexcept(_Nx)
640 >
641 { using type = _Res(_Args...); };
642
643 template<typename _Res, typename _Tp, bool _Nx, typename... _Args>
644 struct __function_guide_helper<
645 _Res (_Tp::*) (_Args...) & noexcept(_Nx)
646 >
647 { using type = _Res(_Args...); };
648
649 template<typename _Res, typename _Tp, bool _Nx, typename... _Args>
650 struct __function_guide_helper<
651 _Res (_Tp::*) (_Args...) const noexcept(_Nx)
652 >
653 { using type = _Res(_Args...); };
654
655 template<typename _Res, typename _Tp, bool _Nx, typename... _Args>
656 struct __function_guide_helper<
657 _Res (_Tp::*) (_Args...) const & noexcept(_Nx)
658 >
659 { using type = _Res(_Args...); };
660
661 template<typename _Res, typename... _ArgTypes>
662 function(_Res(*)(_ArgTypes...)) -> function<_Res(_ArgTypes...)>;
663
664 template<typename _Functor, typename _Signature = typename
665 __function_guide_helper<decltype(&_Functor::operator())>::type>
666 function(_Functor) -> function<_Signature>;
667#endif
668
669 // Out-of-line member definitions.
670 template<typename _Res, typename... _ArgTypes>
671 function<_Res(_ArgTypes...)>::
672 function(const function& __x)
673 : _Function_base()
674 {
675 if (static_cast<bool>(__x))
676 {
677 __x._M_manager(_M_functor, __x._M_functor, __clone_functor);
678 _M_invoker = __x._M_invoker;
679 _M_manager = __x._M_manager;
680 }
681 }
682
683 template<typename _Res, typename... _ArgTypes>
684 template<typename _Functor, typename, typename>
685 function<_Res(_ArgTypes...)>::
686 function(_Functor __f)
687 : _Function_base()
688 {
689 typedef _Function_handler<_Res(_ArgTypes...), _Functor> _My_handler;
690
691 if (_My_handler::_M_not_empty_function(__f))
4
←
Taking true branch
→
692 {
693 _My_handler::_M_init_functor(_M_functor, std::move(__f));
5
←
Calling '_Base_manager::_M_init_functor'
→
9
←
Returned allocated memory
→
694 _M_invoker = &_My_handler::_M_invoke;
695 _M_manager = &_My_handler::_M_manager;
696 }
697 }
698
699 template<typename _Res, typename... _ArgTypes>
700 _Res
701 function<_Res(_ArgTypes...)>::
702 operator()(_ArgTypes... __args) const
703 {
704 if (_M_empty())
705 __throw_bad_function_call();
706 return _M_invoker(_M_functor, std::forward<_ArgTypes>(__args)...);
707 }
708
709#if __cpp_rtti199711
710 template<typename _Res, typename... _ArgTypes>
711 const type_info&
712 function<_Res(_ArgTypes...)>::
713 target_type() const noexcept
714 {
715 if (_M_manager)
716 {
717 _Any_data __typeinfo_result;
718 _M_manager(__typeinfo_result, _M_functor, __get_type_info);
719 return *__typeinfo_result._M_access<const type_info*>();
720 }
721 else
722 return typeid(void);
723 }
724
725 template<typename _Res, typename... _ArgTypes>
726 template<typename _Functor>
727 _Functor*
728 function<_Res(_ArgTypes...)>::
729 target() noexcept
730 {
731 const function* __const_this = this;
732 const _Functor* __func = __const_this->template target<_Functor>();
733 return const_cast<_Functor*>(__func);
734 }
735
736 template<typename _Res, typename... _ArgTypes>
737 template<typename _Functor>
738 const _Functor*
739 function<_Res(_ArgTypes...)>::
740 target() const noexcept
741 {
742 if (typeid(_Functor) == target_type() && _M_manager)
743 {
744 _Any_data __ptr;
745 _M_manager(__ptr, _M_functor, __get_functor_ptr);
746 return __ptr._M_access<const _Functor*>();
747 }
748 else
749 return nullptr;
750 }
751#endif
752
753 // [20.7.15.2.6] null pointer comparisons
754
755 /**
756 * @brief Compares a polymorphic function object wrapper against 0
757 * (the NULL pointer).
758 * @returns @c true if the wrapper has no target, @c false otherwise
759 *
760 * This function will not throw an %exception.
761 */
762 template<typename _Res, typename... _Args>
763 inline bool
764 operator==(const function<_Res(_Args...)>& __f, nullptr_t) noexcept
765 { return !static_cast<bool>(__f); }
766
767 /// @overload
768 template<typename _Res, typename... _Args>
769 inline bool
770 operator==(nullptr_t, const function<_Res(_Args...)>& __f) noexcept
771 { return !static_cast<bool>(__f); }
772
773 /**
774 * @brief Compares a polymorphic function object wrapper against 0
775 * (the NULL pointer).
776 * @returns @c false if the wrapper has no target, @c true otherwise
777 *
778 * This function will not throw an %exception.
779 */
780 template<typename _Res, typename... _Args>
781 inline bool
782 operator!=(const function<_Res(_Args...)>& __f, nullptr_t) noexcept
783 { return static_cast<bool>(__f); }
784
785 /// @overload
786 template<typename _Res, typename... _Args>
787 inline bool
788 operator!=(nullptr_t, const function<_Res(_Args...)>& __f) noexcept
789 { return static_cast<bool>(__f); }
790
791
792 // [20.7.15.2.7] specialized algorithms
793
794 /**
795 * @brief Swap the targets of two polymorphic function object wrappers.
796 *
797 * This function will not throw an %exception.
798 */
799 // _GLIBCXX_RESOLVE_LIB_DEFECTS
800 // 2062. Effect contradictions w/o no-throw guarantee of std::function swaps
801 template<typename _Res, typename... _Args>
802 inline void
803 swap(function<_Res(_Args...)>& __x, function<_Res(_Args...)>& __y) noexcept
804 { __x.swap(__y); }
805
806_GLIBCXX_END_NAMESPACE_VERSION
807} // namespace std
808
809#endif // C++11
810
811#endif // _GLIBCXX_STD_FUNCTION_H