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Diffstat (limited to 'include/llvm/Analysis/EHPersonalities.h')
-rw-r--r-- | include/llvm/Analysis/EHPersonalities.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/include/llvm/Analysis/EHPersonalities.h b/include/llvm/Analysis/EHPersonalities.h new file mode 100644 index 000000000000..59e9672b88e5 --- /dev/null +++ b/include/llvm/Analysis/EHPersonalities.h @@ -0,0 +1,94 @@ +//===- EHPersonalities.h - Compute EH-related information -----------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_ANALYSIS_EHPERSONALITIES_H +#define LLVM_ANALYSIS_EHPERSONALITIES_H + +#include "llvm/ADT/DenseMap.h" +#include "llvm/ADT/TinyPtrVector.h" +#include "llvm/Support/ErrorHandling.h" + +namespace llvm { +class BasicBlock; +class Function; +class Value; + +enum class EHPersonality { + Unknown, + GNU_Ada, + GNU_C, + GNU_CXX, + GNU_ObjC, + MSVC_X86SEH, + MSVC_Win64SEH, + MSVC_CXX, + CoreCLR +}; + +/// \brief See if the given exception handling personality function is one +/// that we understand. If so, return a description of it; otherwise return +/// Unknown. +EHPersonality classifyEHPersonality(const Value *Pers); + +/// \brief Returns true if this personality function catches asynchronous +/// exceptions. +inline bool isAsynchronousEHPersonality(EHPersonality Pers) { + // The two SEH personality functions can catch asynch exceptions. We assume + // unknown personalities don't catch asynch exceptions. + switch (Pers) { + case EHPersonality::MSVC_X86SEH: + case EHPersonality::MSVC_Win64SEH: + return true; + default: + return false; + } + llvm_unreachable("invalid enum"); +} + +/// \brief Returns true if this is a personality function that invokes +/// handler funclets (which must return to it). +inline bool isFuncletEHPersonality(EHPersonality Pers) { + switch (Pers) { + case EHPersonality::MSVC_CXX: + case EHPersonality::MSVC_X86SEH: + case EHPersonality::MSVC_Win64SEH: + case EHPersonality::CoreCLR: + return true; + default: + return false; + } + llvm_unreachable("invalid enum"); +} + +/// \brief Return true if this personality may be safely removed if there +/// are no invoke instructions remaining in the current function. +inline bool isNoOpWithoutInvoke(EHPersonality Pers) { + switch (Pers) { + case EHPersonality::Unknown: + return false; + // All known personalities currently have this behavior + default: + return true; + } + llvm_unreachable("invalid enum"); +} + +bool canSimplifyInvokeNoUnwind(const Function *F); + +typedef TinyPtrVector<BasicBlock *> ColorVector; + +/// \brief If an EH funclet personality is in use (see isFuncletEHPersonality), +/// this will recompute which blocks are in which funclet. It is possible that +/// some blocks are in multiple funclets. Consider this analysis to be +/// expensive. +DenseMap<BasicBlock *, ColorVector> colorEHFunclets(Function &F); + +} // end namespace llvm + +#endif |