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06fe9815da
This adds support for TSan C++ exception handling, where we need to add extra calls to __tsan_func_exit when a function is exitted via exception mechanisms. Otherwise the shadow stack gets corrupted (leaked). This patch moves and enhances the existing implementation of EscapeEnumerator that finds all possible function exit points, and adds extra EH cleanup blocks where needed. Differential Revision: https://reviews.llvm.org/D26177 llvm-svn: 286893
50 lines
1.5 KiB
C++
50 lines
1.5 KiB
C++
//===-- EscapeEnumerator.h --------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Defines a helper class that enumerates all possible exits from a function,
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// including exception handling.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_ESCAPEENUMERATOR_H
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#define LLVM_TRANSFORMS_UTILS_ESCAPEENUMERATOR_H
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/Function.h"
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namespace llvm {
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/// EscapeEnumerator - This is a little algorithm to find all escape points
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/// from a function so that "finally"-style code can be inserted. In addition
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/// to finding the existing return and unwind instructions, it also (if
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/// necessary) transforms any call instructions into invokes and sends them to
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/// a landing pad.
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class EscapeEnumerator {
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Function &F;
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const char *CleanupBBName;
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Function::iterator StateBB, StateE;
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IRBuilder<> Builder;
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bool Done;
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bool HandleExceptions;
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public:
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EscapeEnumerator(Function &F, const char *N = "cleanup",
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bool HandleExceptions = true)
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: F(F), CleanupBBName(N), StateBB(F.begin()), StateE(F.end()),
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Builder(F.getContext()), Done(false),
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HandleExceptions(HandleExceptions) {}
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IRBuilder<> *Next();
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};
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}
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#endif // LLVM_TRANSFORMS_UTILS_ESCAPEENUMERATOR_H
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