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Summary: AIX uses the existing EH infrastructure in clang and llvm. The major differences would be 1. AIX do not have CFI instructions. 2. AIX uses a new personality routine, named __xlcxx_personality_v1. It doesn't use the GCC personality rountine, because the interoperability is not there yet on AIX. 3. AIX do not use eh_frame sections. Instead, it would use a eh_info section (compat unwind section) to store the information about personality routine and LSDA data address. Reviewed By: daltenty, hubert.reinterpretcast Differential Revision: https://reviews.llvm.org/D91455
120 lines
3.2 KiB
C++
120 lines
3.2 KiB
C++
//===- EHPersonalities.h - Compute EH-related information -----------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_EHPERSONALITIES_H
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#define LLVM_ANALYSIS_EHPERSONALITIES_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/TinyPtrVector.h"
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#include "llvm/Support/ErrorHandling.h"
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namespace llvm {
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class BasicBlock;
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class Function;
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class Triple;
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class Value;
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enum class EHPersonality {
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Unknown,
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GNU_Ada,
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GNU_C,
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GNU_C_SjLj,
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GNU_CXX,
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GNU_CXX_SjLj,
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GNU_ObjC,
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MSVC_X86SEH,
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MSVC_TableSEH,
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MSVC_CXX,
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CoreCLR,
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Rust,
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Wasm_CXX,
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XL_CXX
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};
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/// See if the given exception handling personality function is one
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/// that we understand. If so, return a description of it; otherwise return
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/// Unknown.
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EHPersonality classifyEHPersonality(const Value *Pers);
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StringRef getEHPersonalityName(EHPersonality Pers);
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EHPersonality getDefaultEHPersonality(const Triple &T);
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/// Returns true if this personality function catches asynchronous
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/// exceptions.
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inline bool isAsynchronousEHPersonality(EHPersonality Pers) {
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// The two SEH personality functions can catch asynch exceptions. We assume
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// unknown personalities don't catch asynch exceptions.
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switch (Pers) {
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case EHPersonality::MSVC_X86SEH:
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case EHPersonality::MSVC_TableSEH:
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return true;
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default:
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return false;
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}
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llvm_unreachable("invalid enum");
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}
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/// Returns true if this is a personality function that invokes
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/// handler funclets (which must return to it).
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inline bool isFuncletEHPersonality(EHPersonality Pers) {
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switch (Pers) {
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case EHPersonality::MSVC_CXX:
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case EHPersonality::MSVC_X86SEH:
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case EHPersonality::MSVC_TableSEH:
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case EHPersonality::CoreCLR:
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return true;
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default:
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return false;
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}
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llvm_unreachable("invalid enum");
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}
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/// Returns true if this personality uses scope-style EH IR instructions:
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/// catchswitch, catchpad/ret, and cleanuppad/ret.
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inline bool isScopedEHPersonality(EHPersonality Pers) {
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switch (Pers) {
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case EHPersonality::MSVC_CXX:
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case EHPersonality::MSVC_X86SEH:
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case EHPersonality::MSVC_TableSEH:
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case EHPersonality::CoreCLR:
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case EHPersonality::Wasm_CXX:
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return true;
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default:
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return false;
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}
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llvm_unreachable("invalid enum");
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}
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/// Return true if this personality may be safely removed if there
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/// are no invoke instructions remaining in the current function.
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inline bool isNoOpWithoutInvoke(EHPersonality Pers) {
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switch (Pers) {
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case EHPersonality::Unknown:
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return false;
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// All known personalities currently have this behavior
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default:
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return true;
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}
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llvm_unreachable("invalid enum");
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}
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bool canSimplifyInvokeNoUnwind(const Function *F);
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typedef TinyPtrVector<BasicBlock *> ColorVector;
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/// If an EH funclet personality is in use (see isFuncletEHPersonality),
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/// this will recompute which blocks are in which funclet. It is possible that
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/// some blocks are in multiple funclets. Consider this analysis to be
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/// expensive.
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DenseMap<BasicBlock *, ColorVector> colorEHFunclets(Function &F);
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} // end namespace llvm
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#endif
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