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