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infrastructure. This AA was never used in tree. It's infrastructure also completely overlaps that of TargetLibraryInfo which is used heavily by BasicAA to achieve similar goals to those stated for this analysis. As has come up in several discussions, the use case here is still really important, but this code isn't helping move toward that use case. Any progress on better supporting rich AA information for runtime library environments would likely be better off starting from scratch or starting from TargetLibraryInfo than from this base. Differential Revision: http://reviews.llvm.org/D12028 llvm-svn: 245155
46 lines
2.0 KiB
C++
46 lines
2.0 KiB
C++
//===- LibCallSemantics.cpp - Describe library semantics ------------------===//
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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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// This file implements interfaces that can be used to describe language
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// specific runtime library interfaces (e.g. libc, libm, etc) to LLVM
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// optimizers.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/LibCallSemantics.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/IR/Function.h"
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using namespace llvm;
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/// See if the given exception handling personality function is one that we
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/// understand. If so, return a description of it; otherwise return Unknown.
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EHPersonality llvm::classifyEHPersonality(const Value *Pers) {
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const Function *F = dyn_cast<Function>(Pers->stripPointerCasts());
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if (!F)
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return EHPersonality::Unknown;
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return StringSwitch<EHPersonality>(F->getName())
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.Case("__gnat_eh_personality", EHPersonality::GNU_Ada)
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.Case("__gxx_personality_v0", EHPersonality::GNU_CXX)
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.Case("__gcc_personality_v0", EHPersonality::GNU_C)
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.Case("__objc_personality_v0", EHPersonality::GNU_ObjC)
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.Case("_except_handler3", EHPersonality::MSVC_X86SEH)
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.Case("_except_handler4", EHPersonality::MSVC_X86SEH)
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.Case("__C_specific_handler", EHPersonality::MSVC_Win64SEH)
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.Case("__CxxFrameHandler3", EHPersonality::MSVC_CXX)
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.Default(EHPersonality::Unknown);
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}
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bool llvm::canSimplifyInvokeNoUnwind(const Function *F) {
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EHPersonality Personality = classifyEHPersonality(F->getPersonalityFn());
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// We can't simplify any invokes to nounwind functions if the personality
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// function wants to catch asynch exceptions. The nounwind attribute only
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// implies that the function does not throw synchronous exceptions.
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return !isAsynchronousEHPersonality(Personality);
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}
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