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fb407ff21d
If the function has the landingpad instruction, then the
handlerdata should be emitted even if the function has
nouwnind attribute. Otherwise, following code will not
work:
void test1() noexcept {
try {
throw_exception();
} catch (...) {
log_unexpected_exception();
}
}
Since the cantunwind was incorrectly emitted and the
LSDA is not available.
llvm-svn: 208791
62 lines
1.6 KiB
LLVM
62 lines
1.6 KiB
LLVM
; Test for handlerdata when the function has landingpad and nounwind.
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; This test case checks whether the handlerdata is generated for the function
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; with landingpad instruction, even if the function has "nounwind" atttribute.
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;
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; For example, although the following function never throws any exception,
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; however, it is still required to generate LSDA, otherwise, we can't catch
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; the exception properly.
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;
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; void test1() noexcept {
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; try {
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; throw_exception();
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; } catch (...) {
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; }
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; }
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; RUN: llc -mtriple arm-unknown-linux-gnueabi -filetype=asm -o - %s \
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; RUN: | FileCheck %s
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declare void @throw_exception()
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declare i32 @__gxx_personality_v0(...)
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declare i8* @__cxa_begin_catch(i8*)
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declare void @__cxa_end_catch()
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define void @test1() nounwind {
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entry:
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invoke void @throw_exception() to label %try.cont unwind label %lpad
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lpad:
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%0 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
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catch i8* null
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%1 = extractvalue { i8*, i32 } %0, 0
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%2 = tail call i8* @__cxa_begin_catch(i8* %1)
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tail call void @__cxa_end_catch()
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br label %try.cont
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try.cont:
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ret void
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}
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; CHECK: .globl test1
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; CHECK: .align 2
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; CHECK: .type test1,%function
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; CHECK-LABEL: test1:
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; CHECK: .fnstart
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; CHECK-NOT: .cantunwind
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; CHECK: .personality __gxx_personality_v0
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; CHECK: .handlerdata
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; CHECK: .align 2
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; CHECK-LABEL: GCC_except_table0:
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; CHECK-LABEL: .Lexception0:
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; CHECK: .byte 255 @ @LPStart Encoding = omit
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; CHECK: .byte 0 @ @TType Encoding = absptr
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; CHECK: .asciz
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; CHECK: .byte 3 @ Call site Encoding = udata4
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; CHECK: .fnend
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