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7dedaabcae
Instead, run both EH preparation passes, and have them both ignore functions with unrecognized EH personalities. Pass delegation involved some hacky code for creating an AnalysisResolver that we don't need now. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231995 91177308-0d34-0410-b5e6-96231b3b80d8
91 lines
3.4 KiB
C++
91 lines
3.4 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/StringMap.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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/// This impl pointer in ~LibCallInfo is actually a StringMap. This
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/// helper does the cast.
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static StringMap<const LibCallFunctionInfo*> *getMap(void *Ptr) {
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return static_cast<StringMap<const LibCallFunctionInfo*> *>(Ptr);
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}
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LibCallInfo::~LibCallInfo() {
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delete getMap(Impl);
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}
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const LibCallLocationInfo &LibCallInfo::getLocationInfo(unsigned LocID) const {
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// Get location info on the first call.
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if (NumLocations == 0)
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NumLocations = getLocationInfo(Locations);
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assert(LocID < NumLocations && "Invalid location ID!");
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return Locations[LocID];
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}
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/// Return the LibCallFunctionInfo object corresponding to
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/// the specified function if we have it. If not, return null.
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const LibCallFunctionInfo *
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LibCallInfo::getFunctionInfo(const Function *F) const {
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StringMap<const LibCallFunctionInfo*> *Map = getMap(Impl);
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/// If this is the first time we are querying for this info, lazily construct
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/// the StringMap to index it.
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if (!Map) {
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Impl = Map = new StringMap<const LibCallFunctionInfo*>();
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const LibCallFunctionInfo *Array = getFunctionInfoArray();
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if (!Array) return nullptr;
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// We now have the array of entries. Populate the StringMap.
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for (unsigned i = 0; Array[i].Name; ++i)
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(*Map)[Array[i].Name] = Array+i;
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}
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// Look up this function in the string map.
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return Map->lookup(F->getName());
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}
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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 InvokeInst *II) {
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const LandingPadInst *LP = II->getLandingPadInst();
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EHPersonality Personality = classifyEHPersonality(LP->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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