llvm例外-RaiseException“?:Unknown signal"； [英] llvm exceptions - RaiseException "?:Unknown signal"
本文介绍了llvm例外-RaiseException“?:Unknown signal"；的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
对于一个非常简单的示例，我正在尝试使异常与llvm一起使用，可以稍后在此基础上进行构建，但是我遇到了一些实际困难，我不确定为什么.
I'm trying to get exceptions working with llvm for a very simple example, that I can later build on but i'm running into some real difficulties and i'm not sure why.
我叮叮当当，将下面的llir代码传递给MCJIT
I got clang to give me the following llir code, that I am passing into the MCJIT
; llvm-as c++exn.ll && llvm-ld -native c++exn.bc -lstdc++.6 && ./a.out
%"class.std::ios_base::Init" = type { i8 }
%"class.std::basic_ostream" = type { i32 (...)**, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", %"class.std::basic_ostream"*, i8, i8, %"class.std::basic_streambuf"*, %"class.std::ctype"*, %"class.std::num_put"*, %"class.std::num_get"* }
%"class.std::ios_base" = type { i32 (...)**, i64, i64, i32, i32, i32, %"struct.std::ios_base::_Callback_list"*, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, %"struct.std::ios_base::_Words"*, %"class.std::locale" }
%"struct.std::ios_base::_Callback_list" = type { %"struct.std::ios_base::_Callback_list"*, void (i32, %"class.std::ios_base"*, i32)*, i32, i32 }
%"struct.std::ios_base::_Words" = type <{ i8*, i32, [4 x i8] }>
%"class.std::locale" = type { %"class.std::locale::_Impl"* }
%"class.std::locale::_Impl" = type { i32, %"class.std::locale::facet"**, i64, %"class.std::locale::facet"**, i8** }
%"class.std::locale::facet" = type <{ i32 (...)**, i32, [4 x i8] }>
%"class.std::basic_streambuf" = type { i32 (...)**, i8*, i8*, i8*, i8*, i8*, i8*, %"class.std::locale" }
%"class.std::ctype" = type <{ %"class.std::locale::facet.base", [4 x i8], i32*, i8, [7 x i8], i32*, i32*, i16*, i8, [256 x i8], [256 x i8], i8, [6 x i8] }>
%"class.std::locale::facet.base" = type <{ i32 (...)**, i32 }>
%"class.std::num_put" = type { %"class.std::locale::facet.base", [4 x i8] }
%"class.std::num_get" = type { %"class.std::locale::facet.base", [4 x i8] }
%class.new_exception = type { %"class.std::exception" }
%"class.std::exception" = type { i32 (...)** }
$_ZN13new_exceptionC2Ev = comdat any
$_ZN13new_exceptionD2Ev = comdat any
$__clang_call_terminate = comdat any
$_ZNSt9exceptionC2Ev = comdat any
$_ZN13new_exceptionD0Ev = comdat any
$_ZTS13new_exception = comdat any
$_ZTI13new_exception = comdat any
$_ZTV13new_exception = comdat any
@_ZStL8__ioinit = internal global %"class.std::ios_base::Init" zeroinitializer, align 1
@_ZTVN10__cxxabiv120__si_class_type_infoE = external global i8*
@_ZTS13new_exception = linkonce_odr constant [16 x i8] c"13new_exception\00", comdat
@_ZTISt9exception = external constant i8*
@_ZTI13new_exception = linkonce_odr constant { i8*, i8*, i8* } { i8* bitcast (i8** getelementptr inbounds (i8*, i8** @_ZTVN10__cxxabiv120__si_class_type_infoE, i64 2) to i8*), i8* getelementptr inbounds ([16 x i8], [16 x i8]* @_ZTS13new_exception, i32 0, i32 0), i8* bitcast (i8** @_ZTISt9exception to i8*) }, comdat
@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str = private unnamed_addr constant [11 x i8] c"caught !!!\00", align 1
@_ZTV13new_exception = linkonce_odr unnamed_addr constant [5 x i8*] [i8* null, i8* bitcast ({ i8*, i8*, i8* }* @_ZTI13new_exception to i8*), i8* bitcast (void (%class.new_exception*)* @_ZN13new_exceptionD2Ev to i8*), i8* bitcast (void (%class.new_exception*)* @_ZN13new_exceptionD0Ev to i8*), i8* bitcast (i8* (%"class.std::exception"*)* @_ZNKSt9exception4whatEv to i8*)], comdat, align 8
@_ZTVSt9exception = external unnamed_addr constant [5 x i8*]
@llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @_GLOBAL__sub_I_runtime_gen.cpp, i8* null }]
; Function Attrs: uwtable
define internal void @__cxx_global_var_init() #0 {
call void @_ZNSt8ios_base4InitC1Ev(%"class.std::ios_base::Init"* @_ZStL8__ioinit)
%1 = call i32 @atexit(void ()* @__dtor__ZStL8__ioinit) #2
ret void
}
declare void @_ZNSt8ios_base4InitC1Ev(%"class.std::ios_base::Init"*) #1
declare void @_ZNSt8ios_base4InitD1Ev(%"class.std::ios_base::Init"*) #1
; Function Attrs: uwtable
define internal void @__dtor__ZStL8__ioinit() #0 {
call void @_ZNSt8ios_base4InitD1Ev(%"class.std::ios_base::Init"* @_ZStL8__ioinit)
ret void
}
; Function Attrs: nounwind
declare i32 @atexit(void ()*) #2
; Function Attrs: uwtable
define void @_Z5functv() #0 {
%1 = call i8* @__cxa_allocate_exception(i64 8) #2
%2 = bitcast i8* %1 to %class.new_exception*
%3 = bitcast %class.new_exception* %2 to i8*
call void @llvm.memset.p0i8.i64(i8* %3, i8 0, i64 8, i32 16, i1 false)
call void @_ZN13new_exceptionC2Ev(%class.new_exception* %2) #2
call void @__cxa_throw(i8* %1, i8* bitcast ({ i8*, i8*, i8* }* @_ZTI13new_exception to i8*), i8* bitcast (void (%class.new_exception*)* @_ZN13new_exceptionD2Ev to i8*)) #11
unreachable
; No predecessors!
ret void
}
declare i8* @__cxa_allocate_exception(i64)
; Function Attrs: argmemonly nounwind
declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) #3
; Function Attrs: inlinehint nounwind uwtable
define linkonce_odr void @_ZN13new_exceptionC2Ev(%class.new_exception* %this) unnamed_addr #4 comdat align 2 {
%1 = alloca %class.new_exception*, align 8
store %class.new_exception* %this, %class.new_exception** %1, align 8
%2 = load %class.new_exception*, %class.new_exception** %1, align 8
%3 = bitcast %class.new_exception* %2 to %"class.std::exception"*
call void @_ZNSt9exceptionC2Ev(%"class.std::exception"* %3) #2
%4 = bitcast %class.new_exception* %2 to i32 (...)***
store i32 (...)** bitcast (i8** getelementptr inbounds ([5 x i8*], [5 x i8*]* @_ZTV13new_exception, i64 0, i64 2) to i32 (...)**), i32 (...)*** %4, align 8
ret void
}
; Function Attrs: inlinehint nounwind uwtable
define linkonce_odr void @_ZN13new_exceptionD2Ev(%class.new_exception* %this) unnamed_addr #4 comdat align 2 {
%1 = alloca %class.new_exception*, align 8
store %class.new_exception* %this, %class.new_exception** %1, align 8
%2 = load %class.new_exception*, %class.new_exception** %1, align 8
%3 = bitcast %class.new_exception* %2 to %"class.std::exception"*
call void @_ZNSt9exceptionD2Ev(%"class.std::exception"* %3) #2
ret void
}
declare void @__cxa_throw(i8*, i8*, i8*)
; Function Attrs: uwtable
define void @_Z4ctchv() #0 personality i8* bitcast (i32 (...)* @__gxx_personality_seh0 to i8*) {
%1 = alloca i8*
%2 = alloca i32
%o = alloca %class.new_exception*, align 8
invoke void @_Z5functv()
to label %3 unwind label %4
; <label>:3 ; preds = %0
br label %20
; <label>:4 ; preds = %0
%5 = landingpad { i8*, i32 }
catch i8* bitcast ({ i8*, i8*, i8* }* @_ZTI13new_exception to i8*)
%6 = extractvalue { i8*, i32 } %5, 0
store i8* %6, i8** %1, align 8
%7 = extractvalue { i8*, i32 } %5, 1
store i32 %7, i32* %2, align 4
br label %8
; <label>:8 ; preds = %4
%9 = load i32, i32* %2, align 4
%10 = call i32 @llvm.eh.typeid.for(i8* bitcast ({ i8*, i8*, i8* }* @_ZTI13new_exception to i8*)) #2
%11 = icmp eq i32 %9, %10
br i1 %11, label %12, label %26
; <label>:12 ; preds = %8
%13 = load i8*, i8** %1, align 8
%14 = call i8* @__cxa_begin_catch(i8* %13) #2
%15 = bitcast i8* %14 to %class.new_exception*
store %class.new_exception* %15, %class.new_exception** %o, align 8
%16 = invoke dereferenceable(272) %"class.std::basic_ostream"* @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(%"class.std::basic_ostream"* dereferenceable(272) @_ZSt4cout, i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i32 0, i32 0))
to label %17 unwind label %21
; <label>:17 ; preds = %12
%18 = invoke dereferenceable(272) %"class.std::basic_ostream"* @_ZNSolsEPFRSoS_E(%"class.std::basic_ostream"* %16, %"class.std::basic_ostream"* (%"class.std::basic_ostream"*)* @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
to label %19 unwind label %21
; <label>:19 ; preds = %17
call void @__cxa_end_catch()
br label %20
; <label>:20 ; preds = %19, %3
ret void
; <label>:21 ; preds = %17, %12
%22 = landingpad { i8*, i32 }
cleanup
%23 = extractvalue { i8*, i32 } %22, 0
store i8* %23, i8** %1, align 8
%24 = extractvalue { i8*, i32 } %22, 1
store i32 %24, i32* %2, align 4
invoke void @__cxa_end_catch()
to label %25 unwind label %31
; <label>:25 ; preds = %21
br label %26
; <label>:26 ; preds = %25, %8
%27 = load i8*, i8** %1, align 8
%28 = load i32, i32* %2, align 4
%29 = insertvalue { i8*, i32 } undef, i8* %27, 0
%30 = insertvalue { i8*, i32 } %29, i32 %28, 1
resume { i8*, i32 } %30
; <label>:31 ; preds = %21
%32 = landingpad { i8*, i32 }
catch i8* null
%33 = extractvalue { i8*, i32 } %32, 0
call void @__clang_call_terminate(i8* %33) #12
unreachable
}
declare i32 @__gxx_personality_seh0(...)
; Function Attrs: nounwind readnone
declare i32 @llvm.eh.typeid.for(i8*) #5
declare i8* @__cxa_begin_catch(i8*)
declare dereferenceable(272) %"class.std::basic_ostream"* @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(%"class.std::basic_ostream"* dereferenceable(272), i8*) #1
declare dereferenceable(272) %"class.std::basic_ostream"* @_ZNSolsEPFRSoS_E(%"class.std::basic_ostream"*, %"class.std::basic_ostream"* (%"class.std::basic_ostream"*)*) #1
declare dereferenceable(272) %"class.std::basic_ostream"* @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_(%"class.std::basic_ostream"* dereferenceable(272)) #1
declare void @__cxa_end_catch()
; Function Attrs: noinline noreturn nounwind
define linkonce_odr hidden void @__clang_call_terminate(i8*) #6 comdat {
%2 = call i8* @__cxa_begin_catch(i8* %0) #2
call void @_ZSt9terminatev() #12
unreachable
}
declare void @_ZSt9terminatev()
; Function Attrs: norecurse uwtable
define i32 @main() #7 {
call void @_Z4ctchv()
ret i32 0
}
; Function Attrs: nounwind uwtable
define linkonce_odr void @_ZNSt9exceptionC2Ev(%"class.std::exception"* %this) unnamed_addr #8 comdat align 2 {
%1 = alloca %"class.std::exception"*, align 8
store %"class.std::exception"* %this, %"class.std::exception"** %1, align 8
%2 = load %"class.std::exception"*, %"class.std::exception"** %1, align 8
%3 = bitcast %"class.std::exception"* %2 to i32 (...)***
store i32 (...)** bitcast (i8** getelementptr inbounds ([5 x i8*], [5 x i8*]* @_ZTVSt9exception, i64 0, i64 2) to i32 (...)**), i32 (...)*** %3, align 8
ret void
}
; Function Attrs: inlinehint nounwind uwtable
define linkonce_odr void @_ZN13new_exceptionD0Ev(%class.new_exception* %this) unnamed_addr #4 comdat align 2 {
%1 = alloca %class.new_exception*, align 8
store %class.new_exception* %this, %class.new_exception** %1, align 8
%2 = load %class.new_exception*, %class.new_exception** %1, align 8
call void @_ZN13new_exceptionD2Ev(%class.new_exception* %2) #2
%3 = bitcast %class.new_exception* %2 to i8*
call void @_ZdlPv(i8* %3) #13
ret void
}
; Function Attrs: nounwind
declare i8* @_ZNKSt9exception4whatEv(%"class.std::exception"*) #9
; Function Attrs: nobuiltin nounwind
declare void @_ZdlPv(i8*) #10
; Function Attrs: nounwind
declare void @_ZNSt9exceptionD2Ev(%"class.std::exception"*) #9
; Function Attrs: uwtable
define internal void @_GLOBAL__sub_I_runtime_gen.cpp() #0 {
call void @__cxx_global_var_init()
ret void
}
attributes #0 = { uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #2 = { nounwind }
attributes #3 = { argmemonly nounwind }
attributes #4 = { inlinehint nounwind uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #5 = { nounwind readnone }
attributes #6 = { noinline noreturn nounwind }
attributes #7 = { norecurse uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #8 = { nounwind uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #9 = { nounwind "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #10 = { nobuiltin nounwind "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #11 = { noreturn }
attributes #12 = { noreturn nounwind }
attributes #13 = { builtin nounwind }
这是从以下C ++代码生成的llir代码.
This is the llir code generated from the following C++ code.
#include <iostream>
#include <exception>
using namespace std;
class new_exception : public exception {
const char* what() {
return "new_exception";
}
};
void funct() {
throw new_exception();
}
void ctch() {
try {
funct();
} catch(new_exception& o) {
std::cout << "caught !!!" << std::endl;
}
}
int main() {
ctch();
}
由MCJIT在Windows上编译时，没有问题，但运行时崩溃，当与gdb一起运行时，它挂起并显示消息"RaiseException()?:未知信号".
When loaded it compiled by MCJIT on windows without issue but when run it crashes, when run with gdb it halts with message 'RaiseException() ?:Unknown signal'.
据我所知，异常已得到正确处理，被代码捕获"，因此不应成为问题.
As far as I am aware the exception is being handled correctly, "caught" by the code and so shouldn't be the issue.
我对人格功能的使用是否正确，我仔细查看了一些答案，这些暗示表明在Windows上使用基于SEH的人格可能不正确.如果这是错误的，还有什么选择?为什么clang会编写不正确的代码?
Is my use of the personality function correct, I have looked through answers that suggest the use of SEH based personality on windows might be wrong. What is the alternative if this is wrong and why would clang write incorrect code?
平台为Windows X86_64
Platform is Windows X86_64
target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-w64-windows-gnu"
推荐答案
我开始在clang和msvc 2015的Windows C ++中使用异常，并且它们在标准C ++异常方面的工作非常好( Microsoft文档调用了 synchronous )-无需使用SEH(又称为结构化异常处理)，Microsoft将其称为异步.
I'm starting to use exceptions in C++ for Windows with clang and msvc 2015, and they do work very well with standard C++ exceptions (that Microsoft documentation calls synchronous) -- no need to use SEH (AKA Structured Exception Handling), that Microsoft calls asynchronous.
这篇关于llvm例外-RaiseException“?:Unknown signal"；的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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