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Add Windows Control Flow Guard checks (/guard:cf).
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
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Original file line number | Diff line number | Diff line change |
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// RUN: %clang_cc1 -cfguard -emit-llvm %s -o - | FileCheck %s | ||
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void f() {} | ||
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// Check that the cfguardtable metadata flag gets set on the module. | ||
// CHECK: !"cfguardtable", i32 1} | ||
// RUN: %clang_cc1 -cfguard-no-checks -emit-llvm %s -o - | FileCheck %s -check-prefix=CFGUARDNOCHECKS | ||
// RUN: %clang_cc1 -cfguard -emit-llvm %s -o - | FileCheck %s -check-prefix=CFGUARD | ||
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void f() {} | ||
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// Check that the cfguard metadata flag gets correctly set on the module. | ||
// CFGUARDNOCHECKS: !"cfguard", i32 1} | ||
// CFGUARD: !"cfguard", i32 2} |
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//===-- CFGuard.h - CFGuard Transformations ---------------------*- C++ -*-===// | ||
// | ||
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | ||
// See https://llvm.org/LICENSE.txt for license information. | ||
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
// | ||
//===---------------------------------------------------------------------===// | ||
// Windows Control Flow Guard passes (/guard:cf). | ||
//===---------------------------------------------------------------------===// | ||
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#ifndef LLVM_TRANSFORMS_CFGUARD_H | ||
#define LLVM_TRANSFORMS_CFGUARD_H | ||
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namespace llvm { | ||
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class FunctionPass; | ||
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/// Insert Control FLow Guard checks on indirect function calls. | ||
FunctionPass *createCFGuardCheckPass(); | ||
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/// Insert Control FLow Guard dispatches on indirect function calls. | ||
FunctionPass *createCFGuardDispatchPass(); | ||
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} // namespace llvm | ||
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#endif |
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