2461cdb417
Once the default for SimplifyCFG flips, we can no longer pass nullptr instead of DomTree to SimplifyCFG, so we need to propagate it here. We don't strictly need to actually preserve DomTree in DwarfEHPrepare, but we might as well do it, since it's trivial.
159 lines
4.2 KiB
LLVM
159 lines
4.2 KiB
LLVM
; RUN: opt -mtriple=x86_64-linux-gnu -dwarfehprepare -simplifycfg-require-and-preserve-domtree=1 < %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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