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https://github.com/c64scene-ar/llvm-6502.git
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7d7d99622f
The old system was fairly convoluted: * A temporary label was created. * A single PROLOG_LABEL was created with it. * A few MCCFIInstructions were created with the same label. The semantics were that the cfi instructions were mapped to the PROLOG_LABEL via the temporary label. The output position was that of the PROLOG_LABEL. The temporary label itself was used only for doing the mapping. The new CFI_INSTRUCTION has a 1:1 mapping to MCCFIInstructions and points to one by holding an index into the CFI instructions of this function. I did consider removing MMI.getFrameInstructions completelly and having CFI_INSTRUCTION own a MCCFIInstruction, but MCCFIInstructions have non trivial constructors and destructors and are somewhat big, so the this setup is probably better. The net result is that we don't create temporary labels that are never used. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203204 91177308-0d34-0410-b5e6-96231b3b80d8
61 lines
2.1 KiB
LLVM
61 lines
2.1 KiB
LLVM
; RUN: llc -mtriple=aarch64-none-linux-gnu -relocation-model=pic -o - %s | FileCheck %s
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; Make sure exception-handling PIC code can be linked correctly. An alternative
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; to the sequence described below would have .gcc_except_table itself writable
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; and not use the indirection, but this isn't what LLVM does right now.
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; There should be a read-only .gcc_except_table section...
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; CHECK: .section .gcc_except_table,"a"
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; ... referring indirectly to stubs for its typeinfo ...
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; CHECK: // @TType Encoding = indirect pcrel sdata8
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; ... one of which is "int"'s typeinfo
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; CHECK: .Ltmp7:
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; CHECK-NEXT: .xword .L_ZTIi.DW.stub-.Ltmp7
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; .. and which is properly defined (in a writable section for the dynamic loader) later.
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; CHECK: .section .data.rel,"aw"
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; CHECK: .L_ZTIi.DW.stub:
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; CHECK-NEXT: .xword _ZTIi
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@_ZTIi = external constant i8*
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define i32 @_Z3barv() {
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entry:
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invoke void @_Z3foov()
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to label %return unwind label %lpad
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lpad: ; preds = %entry
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%0 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
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catch i8* bitcast (i8** @_ZTIi to i8*)
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%1 = extractvalue { i8*, i32 } %0, 1
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%2 = tail call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*)) nounwind
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%matches = icmp eq i32 %1, %2
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br i1 %matches, label %catch, label %eh.resume
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catch: ; preds = %lpad
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%3 = extractvalue { i8*, i32 } %0, 0
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%4 = tail call i8* @__cxa_begin_catch(i8* %3) nounwind
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%5 = bitcast i8* %4 to i32*
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%exn.scalar = load i32* %5, align 4
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tail call void @__cxa_end_catch() nounwind
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br label %return
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return: ; preds = %entry, %catch
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%retval.0 = phi i32 [ %exn.scalar, %catch ], [ 42, %entry ]
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ret i32 %retval.0
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eh.resume: ; preds = %lpad
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resume { i8*, i32 } %0
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}
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declare void @_Z3foov()
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declare i32 @__gxx_personality_v0(...)
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declare i32 @llvm.eh.typeid.for(i8*) nounwind readnone
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declare i8* @__cxa_begin_catch(i8*)
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declare void @__cxa_end_catch()
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