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d090368b0c
Summary: A new function pass (Transforms/CFGuard/CFGuard.cpp) inserts CFGuard checks on indirect function calls, using either the check mechanism (X86, ARM, AArch64) or or the dispatch mechanism (X86-64). The check mechanism requires a new calling convention for the supported targets. The dispatch mechanism adds the target as an operand bundle, which is processed by SelectionDAG. Another pass (CodeGen/CFGuardLongjmp.cpp) identifies and emits valid longjmp targets, as required by /guard:cf. This feature is enabled using the `cfguard` CC1 option. Reviewers: thakis, rnk, theraven, pcc Subscribers: ychen, hans, metalcanine, dmajor, tomrittervg, alex, mehdi_amini, mgorny, javed.absar, kristof.beyls, hiraditya, steven_wu, dexonsmith, cfe-commits, llvm-commits Tags: #clang, #llvm Differential Revision: https://reviews.llvm.org/D65761
57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
//===-- WinCFGuard.h - Windows Control Flow Guard Handling ----*- C++ -*--===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains support for writing the metadata for Windows Control Flow
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// Guard, including address-taken functions, and valid longjmp targets.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_WINCFGUARD_H
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#define LLVM_LIB_CODEGEN_ASMPRINTER_WINCFGUARD_H
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#include "llvm/CodeGen/AsmPrinterHandler.h"
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#include "llvm/Support/Compiler.h"
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#include <vector>
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namespace llvm {
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class LLVM_LIBRARY_VISIBILITY WinCFGuard : public AsmPrinterHandler {
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/// Target of directive emission.
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AsmPrinter *Asm;
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std::vector<const MCSymbol *> LongjmpTargets;
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public:
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WinCFGuard(AsmPrinter *A);
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~WinCFGuard() override;
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void setSymbolSize(const MCSymbol *Sym, uint64_t Size) override {}
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/// Emit the Control Flow Guard function ID table.
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void endModule() override;
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/// Gather pre-function debug information.
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/// Every beginFunction(MF) call should be followed by an endFunction(MF)
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/// call.
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void beginFunction(const MachineFunction *MF) override {}
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/// Gather post-function debug information.
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/// Please note that some AsmPrinter implementations may not call
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/// beginFunction at all.
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void endFunction(const MachineFunction *MF) override;
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/// Process beginning of an instruction.
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void beginInstruction(const MachineInstr *MI) override {}
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/// Process end of an instruction.
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void endInstruction() override {}
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};
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} // namespace llvm
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#endif
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