159 lines
4.2 KiB
LLVM
159 lines
4.2 KiB
LLVM
; RUN: opt -mtriple=x86_64-linux-gnu -dwarfehprepare < %s -S | FileCheck %s
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; Check basic functionality of IR-to-IR DWARF EH preparation. This should
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; eliminate resumes. This pass requires a TargetMachine, so we put it under X86
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; and provide an x86 triple.
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@int_typeinfo = global i8 0
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declare void @might_throw()
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declare void @cleanup()
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define i32 @simple_cleanup_catch() personality i32 (...)* @__gxx_personality_v0 {
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invoke void @might_throw()
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to label %cont unwind label %lpad
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; CHECK-LABEL: define i32 @simple_cleanup_catch()
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; CHECK: invoke void @might_throw()
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cont:
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ret i32 0
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; CHECK: ret i32 0
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lpad:
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%ehvals = landingpad { i8*, i32 }
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cleanup
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catch i8* @int_typeinfo
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%ehptr = extractvalue { i8*, i32 } %ehvals, 0
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%ehsel = extractvalue { i8*, i32 } %ehvals, 1
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call void @cleanup()
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%int_sel = call i32 @llvm.eh.typeid.for(i8* @int_typeinfo)
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%int_match = icmp eq i32 %ehsel, %int_sel
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br i1 %int_match, label %catch_int, label %eh.resume
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; CHECK: lpad:
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; CHECK: landingpad { i8*, i32 }
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; CHECK: call void @cleanup()
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; CHECK: call i32 @llvm.eh.typeid.for
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; CHECK: br i1
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catch_int:
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ret i32 1
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; CHECK: catch_int:
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; CHECK: ret i32 1
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eh.resume:
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%tmp_ehvals = insertvalue { i8*, i32 } undef, i8* %ehptr, 0
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%new_ehvals = insertvalue { i8*, i32 } %tmp_ehvals, i32 %ehsel, 1
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resume { i8*, i32 } %new_ehvals
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; CHECK: eh.resume:
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; CHECK-NEXT: call void @_Unwind_Resume(i8* %ehptr)
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}
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define i32 @catch_no_resume() personality i32 (...)* @__gxx_personality_v0 {
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invoke void @might_throw()
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to label %cont unwind label %lpad
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cont:
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ret i32 0
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lpad:
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%ehvals = landingpad { i8*, i32 }
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catch i8* @int_typeinfo
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%ehptr = extractvalue { i8*, i32 } %ehvals, 0
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%ehsel = extractvalue { i8*, i32 } %ehvals, 1
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%int_sel = call i32 @llvm.eh.typeid.for(i8* @int_typeinfo)
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%int_match = icmp eq i32 %ehsel, %int_sel
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br i1 %int_match, label %catch_int, label %eh.resume
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catch_int:
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ret i32 1
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eh.resume:
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%tmp_ehvals = insertvalue { i8*, i32 } undef, i8* %ehptr, 0
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%new_ehvals = insertvalue { i8*, i32 } %tmp_ehvals, i32 %ehsel, 1
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resume { i8*, i32 } %new_ehvals
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}
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; Check that we can prune the unreachable resume instruction.
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; CHECK-LABEL: define i32 @catch_no_resume() personality i32 (...)* @__gxx_personality_v0 {
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; CHECK: invoke void @might_throw()
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; CHECK: ret i32 0
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; CHECK: lpad:
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; CHECK: landingpad { i8*, i32 }
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; CHECK-NOT: br i1
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; CHECK: ret i32 1
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; CHECK-NOT: call void @_Unwind_Resume
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; CHECK: {{^[}]}}
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define i32 @catch_cleanup_merge() personality i32 (...)* @__gxx_personality_v0 {
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invoke void @might_throw()
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to label %inner_invoke unwind label %outer_lpad
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inner_invoke:
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invoke void @might_throw()
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to label %cont unwind label %inner_lpad
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cont:
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ret i32 0
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outer_lpad:
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%ehvals1 = landingpad { i8*, i32 }
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catch i8* @int_typeinfo
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br label %catch.dispatch
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inner_lpad:
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%ehvals2 = landingpad { i8*, i32 }
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cleanup
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catch i8* @int_typeinfo
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call void @cleanup()
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br label %catch.dispatch
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catch.dispatch:
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%ehvals = phi { i8*, i32 } [ %ehvals1, %outer_lpad ], [ %ehvals2, %inner_lpad ]
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%ehptr = extractvalue { i8*, i32 } %ehvals, 0
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%ehsel = extractvalue { i8*, i32 } %ehvals, 1
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%int_sel = call i32 @llvm.eh.typeid.for(i8* @int_typeinfo)
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%int_match = icmp eq i32 %ehsel, %int_sel
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br i1 %int_match, label %catch_int, label %eh.resume
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catch_int:
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ret i32 1
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eh.resume:
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%tmp_ehvals = insertvalue { i8*, i32 } undef, i8* %ehptr, 0
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%new_ehvals = insertvalue { i8*, i32 } %tmp_ehvals, i32 %ehsel, 1
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resume { i8*, i32 } %new_ehvals
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}
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; We can't prune this merge because one landingpad is a cleanup pad.
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; CHECK-LABEL: define i32 @catch_cleanup_merge()
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; CHECK: invoke void @might_throw()
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; CHECK: invoke void @might_throw()
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; CHECK: ret i32 0
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;
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; CHECK: outer_lpad:
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; CHECK: landingpad { i8*, i32 }
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; CHECK: br label %catch.dispatch
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;
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; CHECK: inner_lpad:
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; CHECK: landingpad { i8*, i32 }
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; CHECK: call void @cleanup()
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; CHECK: br label %catch.dispatch
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;
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; CHECK: catch.dispatch:
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; CHECK: call i32 @llvm.eh.typeid.for
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; CHECK: br i1
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; CHECK: catch_int:
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; CHECK: ret i32 1
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; CHECK: eh.resume:
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; CHECK-NEXT: call void @_Unwind_Resume(i8* %ehptr)
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declare i32 @__gxx_personality_v0(...)
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declare i32 @llvm.eh.typeid.for(i8*)
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