[llvm-dev] assertion triggered since update to llvm 5 (original) (raw)

Davide Italiano via llvm-dev llvm-dev at lists.llvm.org
Sun Sep 17 11:12:23 PDT 2017

Can you please open a bug on bugzilla and attach the ir testcase? Your fix doesn't look right (just hiding the assertion failure)

On Sep 17, 2017 10:45 AM, "Andrew Kelley via llvm-dev" < llvm-dev at lists.llvm.org> wrote:

What do you think about this patch?

--- a/llvm/lib/Transforms/Scalar/NewGVN.cpp +++ b/llvm/lib/Transforms/Scalar/NewGVN.cpp @@ -732,7 +732,7 @@ private: MemoryPhi *getMemoryAccess(const BasicBlock *) const; template <class T, class Range> T *getMinDFSOfRange(const Range &) const; unsigned InstrToDFSNum(const Value *V) const { - assert(isa(V) && "This should not be used for MemoryAccesses"); + assert(V == nullptr || (isa(V) && "This should not be used for MemoryAccesses")); return InstrDFS.lookup(V); }

On Sat, Sep 16, 2017 at 1:48 PM, Andrew Kelley <superjoe30 at gmail.com> wrote: When zig updated to llvm 5 we started hitting this assertion: zig: /home/andy/downloads/llvm-project/llvm/include/llvm/Support/Casting.h:106: static bool llvm::isaimplcl<To, const From*>::doit(const From*) [with To = llvm::Instruction; From = llvm::Value]: Assertion `Val && "isa<> used on a null pointer"' failed. I wonder if however this was caused by an invalid assertion, because up the stack is #8 0x0000000004b58e68 in (anonymous namespace)::NewGVN::InstrToDFSNum (this=0x7fffffffaf80, V=0x0) at /home/andy/downloads/llvm-proj ect/llvm/lib/Transforms/Scalar/NewGVN.cpp:735 735 assert(isa(V) && "This should not be used for MemoryAccesses");

With assertions off the code works fine. Can anyone provide some guidance? Here is a full backtrace: zig: /home/andy/downloads/llvm-project/llvm/include/llvm/Support/Casting.h:106: static bool llvm::isaimplcl<To, const From*>::doit(const From*) [with To = llvm::Instruction; From = llvm::Value]: Assertion `Val && "isa<> used on a null pointer"' failed. Program received signal SIGABRT, Aborted. 0x00007ffff698f3d4 in raise () from /nix/store/s7dw1yngwiskqa2ac1bkc6m9g7740agg-glibc-2.25/lib/ libc.so.6 (gdb) bt #0 0x00007ffff698f3d4 in raise () from /nix/store/s7dw1yngwiskqa2ac1bkc6m9g7740agg-glibc-2.25/lib/ libc.so.6 #1 0x00007ffff699083a in abort () from /nix/store/s7dw1yngwiskqa2ac1bkc6m9g7740agg-glibc-2.25/lib/ libc.so.6 _#2 0x00007ffff69881a7 in assertfailbase () from /nix/store/s7dw1yngwiskqa2ac1bkc6m9g7740agg-glibc-2.25/lib/ libc.so.6 _#3 0x00007ffff6988252 in assertfail () from /nix/store/s7dw1yngwiskqa2ac1bkc6m9g7740agg-glibc-2.25/lib/ libc.so.6 #4 0x0000000002d70389 in llvm::isaimplcl<llvm::Instruction,_ _llvm::Value const*>::doit ( Val=0x0) at /home/andy/downloads/llvm-proj ect/llvm/include/llvm/Support/Casting.h:106 #5 0x0000000002d4f8af in llvm::isaimplwrap<llvm::Instruction,_ _llvm::Value const*, llvm::Value const*>::doit (Val=@0x7fffffffa678: 0x0) at /home/andy/downloads/llvm-project/llvm/include/llvm/Support/ Casting.h:133 #6 0x0000000002ece9a3 in llvm::isaimplwrap<llvm::Instruction,_ _llvm::Value const* const, llvm::Value const*>::doit (Val=@0x7fffffffa6b0: 0x0) at /home/andy/downloads/llvm-project/llvm/include/llvm/Support/ Casting.h:125 #7 0x0000000002ecd4f4 in llvm::isa<llvm::Instruction, llvm::Value_ _const*> ( Val=@0x7fffffffa6b0: 0x0) at /home/andy/downloads/llvm-project/llvm/include/llvm/Support/ Casting.h:144 #8 0x0000000004b58e68 in (anonymous namespace)::NewGVN::InstrToDFSNum (this=0x7fffffffaf80, V=0x0) at /home/andy/downloads/llvm-proj ect/llvm/lib/Transforms/Scalar/NewGVN.cpp:735 #9 0x0000000004b6870d in (anonymous namespace)::NewGVN::touchAndErase<llvm::DenseMap<llvm::Value_ _const*, llvm::SmallPtrSet<llvm::Value*, 2u> >, llvm::Value*> (this=0x7fffffffaf80, M=..., Key=@0x7fffffffa790: 0x9154cf8) at /home/andy/downloads/llvm-project/llvm/lib/Transforms/Scalar /NewGVN.cpp:1930 #10 0x0000000004b5d9b7 in (anonymous namespace)::NewGVN::markUsersTouched (this=0x7fffffffaf80, V=0x9154cf8) at /home/andy/downloads/llvm-proj ect/llvm/lib/Transforms/Scalar/NewGVN.cpp:1946 #11 0x0000000004b5f141 in (anonymous namespace)::NewGVN::performCongruenceFinding ( this=0x7fffffffaf80, I=0x9154cf8, E=0x91d7b70) at /home/andy/downloads/llvm-project/llvm/lib/Transforms/Scalar /NewGVN.cpp:2269 #12 0x0000000004b62174 in (anonymous namespace)::NewGVN::valueNumberInstruction ( this=0x7fffffffaf80, I=0x9154cf8) at /home/andy/downloads/llvm-project/llvm/lib/Transforms/Scalar /NewGVN.cpp:2801 #13 0x0000000004b63b4f in (anonymous namespace)::NewGVN::iterateTouchedInstructions ( this=0x7fffffffaf80) at /home/andy/downloads/llvm-project/llvm/lib/Transforms/Scalar /NewGVN.cpp:3094 #14 0x0000000004b6431c in (anonymous namespace)::NewGVN::runGVN (this=0x7fffffffaf80) at /home/andy/downloads/llvm-project/llvm/lib/Transforms/Scalar /NewGVN.cpp:3165 #15 0x0000000004b678db in (anonymous namespace)::NewGVNLegacyPass::runOnFunction ( this=0x910ea50, F=...) at /home/andy/downloads/llvm-project/llvm/lib/Transforms/Scalar /NewGVN.cpp:3904 #16 0x00000000054d10fd in llvm::FPPassManager::runOnFunction (this=0x9102260, F=...) at /home/andy/downloads/llvm-project/llvm/lib/IR/LegacyPassMana ger.cpp:1514 #17 0x0000000004f2a375 in (anonymous namespace)::CGPassManager::RunPassOnSCC (this=0x9100f00, P=0x9102260, CurSCC=..., CG=..., CallGraphUpToDate=@0x7fffffffbc2f: true, DevirtualizedCall=@0x7fffffffbccf: false) at /home/andy/downloads/llvm-project/llvm/lib/Analysis/CallGrap hSCCPass.cpp:149 #18 0x0000000004f2b349 in (anonymous namespace)::CGPassManager::RunAllPassesOnSCC ( this=0x9100f00, CurSCC=..., CG=..., DevirtualizedCall=@0x7fffffffbccf: false) at /home/andy/downloads/llvm-project/llvm/lib/Analysis/CallGrap hSCCPass.cpp:419 #19 0x0000000004f2b643 in (anonymous namespace)::CGPassManager::runOnModule (this=0x9100f00, M=...) at /home/andy/downloads/llvm-proj ect/llvm/lib/Analysis/CallGraphSCCPass.cpp:474 #20 0x00000000054d15c1 in (anonymous namespace)::MPPassManager::runOnModule (this=0x90f9970, ---Type to continue, or q to quit--- M=...) at /home/andy/downloads/llvm-proj ect/llvm/lib/IR/LegacyPassManager.cpp:1591 #21 0x00000000054d1c73 in llvm::legacy::PassManagerImpl::run (this=0x90f9480, M=...) at /home/andy/downloads/llvm-project/llvm/lib/IR/LegacyPassMana ger.cpp:1694 #22 0x00000000054d1e7f in llvm::legacy::PassManager::run (this=0x7fffffffc010, M=...) at /home/andy/downloads/llvm-project/llvm/lib/IR/LegacyPassMana ger.cpp:1725 #23 0x0000000001d4017d in ZigLLVMTargetMachineEmitToFile (targmachineref=0x9080d50, moduleref=0x907e870, filename=0x90cf360 "./zig-cache/test.o", filetype=LLVMObjectFile, errormessage=0x7fffffffc2f8, isdebug=false) at /home/andy/dev/zig/src/zigllvm.cpp:166 #24 0x0000000001cd041d in docodegen (g=0x907a980) at /home/andy/dev/zig/src/codegen.cpp:4379 #25 0x0000000001cd4634 in codegenbuild (g=0x907a980) at /home/andy/dev/zig/src/codegen.cpp:5484 #26 0x0000000001d1d564 in main (argc=4, argv=0x7fffffffca18) at /home/andy/dev/zig/src/main.cpp:666

Here's the smallest zig test case to cause the problem: export fn entry() { var bytes: []const u8 = "format"; write(bytes); } pub fn write(bytes: []const u8) { var index: usize = 0; var srcindex: usize = 0; while (srcindex < bytes.len) {_ _const destspaceleft = 1 - index;_ _const b = bytes.len - srcindex;_ _const copyamt = if (destspaceleft < b) destspaceleft else b;_ _index += copyamt;_ _srcindex += copyamt;_ _}_ _}_ _pub fn panic(msg: []const u8) -> noreturn { while (true) {} } compile with ./zig buildobj test.zig --release-safe This does the equivalent of -O3 The IR that it produces; ModuleID = 'test' sourcefilename = "test" target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" target triple = "x8664-unknown-linux-gnu" %"[]u8" = type { i8*, i64 } _@zigpanicimplementationprovided = internal unnamedaddr constant i1 true, align 1 @0 = internal unnamedaddr constant i8* getelementptr inbounds ([6 x i8], [6 x i8]* @1, i64 0, i64 0), align 8 @1 = internal unnamedaddr constant [6 x i8] c"format", align 1 @2 = internal unnamedaddr constant { i8*, i64 } { i8* getelementptr inbounds ([6 x i8], [6 x i8]* @1, i64 0, i64 0), i64 6 }, align 8 @3 = internal unnamedaddr constant i8* getelementptr inbounds ([16 x i8], [16 x i8]* @4, i64 0, i64 0), align 8 @4 = internal unnamedaddr constant [16 x i8] c"integer overflow", align 1 @5 = internal unnamedaddr constant { i8*, i64 } { i8* getelementptr inbounds ([16 x i8], [16 x i8]* @4, i64 0, i64 0), i64 16 }, align 8 ; Function Attrs: nobuiltin nounwind define void @entry() #0 !dbg !16 { Entry: %bytes = alloca %"[]u8", align 8 %0 = bitcast %"[]u8"* %bytes to i8*, !dbg !31 call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* bitcast ({ i8*, i64 }* @2 to i8*), i64 16, i32 8, i1 false), !dbg !31 call void @llvm.dbg.declare(metadata %"[]u8"* %bytes, metadata !22, metadata !32), !dbg !31 call fastcc void @write(%"[]u8"* byval %bytes), !dbg !33 ret void, !dbg !35 } ; Function Attrs: cold nobuiltin noreturn nounwind _define linkonce coldcc void @zigpanic(i8* nonnull readonly, i64) #1 !dbg !36 { Entry: %2 = alloca %"[]u8", align 8 %messageptr = alloca i8*, align 8 %messagelen = alloca i64, align 8 store i8* %0, i8** %messageptr, align 8 call void @llvm.dbg.declare(metadata i8** %messageptr, metadata !41, metadata !32), !dbg !44 store i64 %1, i64* %messagelen, align 8 call void @llvm.dbg.declare(metadata i64* %messagelen, metadata !42, metadata !32), !dbg !45 %3 = load i64, i64* %messagelen, align 8, !dbg !46 %4 = load i8*, i8** %messageptr, align 8, !dbg !50 %5 = getelementptr inbounds %"[]u8", %"[]u8"* %2, i32 0, i32 0, !dbg !50 %6 = getelementptr inbounds i8, i8* %4, i64 0, !dbg !50 store i8* %6, i8** %5, align 8, !dbg !50 %7 = getelementptr inbounds %"[]u8", %"[]u8"* %2, i32 0, i32 1, !dbg !50 %8 = sub nsw i64 %3, 0, !dbg !50 store i64 %8, i64* %7, align 8, !dbg !50 call fastcc void @panic(%"[]u8"* byval %2), !dbg !51 unreachable, !dbg !51 } ; Function Attrs: nobuiltin nounwind define internal fastcc void @write(%"[]u8"* byval nonnull readonly) unnamedaddr #0 !dbg !52 { Entry: %index = alloca i64, align 8 %srcindex = alloca i64, align 8 %destspaceleft = alloca i64, align 8 %b = alloca i64, align 8 %copyamt = alloca i64, align 8 call void @llvm.dbg.declare(metadata %"[]u8"* %0, metadata !57, metadata !32), !dbg !70 store i64 0, i64* %index, align 8, !dbg !71 call void @llvm.dbg.declare(metadata i64* %index, metadata !58, metadata !32), !dbg !71 store i64 0, i64* %srcindex, align 8, !dbg !72 call void @llvm.dbg.declare(metadata i64* %srcindex, metadata !61, metadata !32), !dbg !72 br label %WhileCond, !dbg !73 WhileCond: ; preds = %OverflowOk6, %Entry %1 = load i64, i64* %srcindex, align 8, !dbg !74 %2 = getelementptr inbounds %"[]u8", %"[]u8"* %0, i32 0, i32 1, !dbg !75 %3 = load i64, i64* %2, align 8, !dbg !75 %4 = icmp ult i64 %1, %3, !dbg !76 br i1 %4, label %WhileBody, label %WhileEnd, !dbg !76 WhileBody: ; preds = %WhileCond %5 = load i64, i64* %index, align 8, !dbg !77 %6 = call { i64, i1 } @llvm.usub.with.overflow.i64(i64 1, i64 %5), !dbg !78 %7 = extractvalue { i64, i1 } %6, 0, !dbg !78 %8 = extractvalue { i64, i1 } %6, 1, !dbg !78 br i1 %8, label %OverflowFail, label %OverflowOk, !dbg !78 WhileEnd: ; preds = %WhileCond ret void, !dbg !79 Then: ; preds = %OverflowOk2 %9 = load i64, i64* %destspaceleft, align 8, !dbg !80 br label %EndIf, !dbg !81 Else: ; preds = %OverflowOk2 %10 = load i64, i64* %b, align 8, !dbg !82 br label %EndIf, !dbg !81 EndIf: ; preds = %Else, %Then %11 = phi i64 [ %9, %Then ], [ %10, %Else ], !dbg !81 store i64 %11, i64* %copyamt, align 8, !dbg !83 call void @llvm.dbg.declare(metadata i64* %copyamt, metadata !68, metadata !32), !dbg !83 %12 = load i64, i64* %index, align 8, !dbg !84 %13 = load i64, i64* %copyamt, align 8, !dbg !86 %14 = call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 %12, i64 %13), !dbg !87 %15 = extractvalue { i64, i1 } %14, 0, !dbg !87 %16 = extractvalue { i64, i1 } %14, 1, !dbg !87 br i1 %16, label %OverflowFail3, label %OverflowOk4, !dbg !87 OverflowFail: ; preds = %WhileBody %17 = load i8*, i8** getelementptr inbounds ({ i8*, i64 }, { i8*, i64 }* @5, i32 0, i32 0), align 8, !dbg !78 %18 = load i64, i64* getelementptr inbounds ({ i8*, i64 }, { i8*, i64 }* @5, i32 0, i32 1), align 8, !dbg !78 _call coldcc void @zigpanic(i8* %17, i64 %18), !dbg !78 unreachable, !dbg !78 OverflowOk: ; preds = %WhileBody store i64 %7, i64* %destspaceleft, align 8, !dbg !88 call void @llvm.dbg.declare(metadata i64* %destspaceleft, metadata !63, metadata !32), !dbg !88 %19 = getelementptr inbounds %"[]u8", %"[]u8"* %0, i32 0, i32 1, !dbg !89 %20 = load i64, i64* %19, align 8, !dbg !89 %21 = load i64, i64* %srcindex, align 8, !dbg !90 %22 = call { i64, i1 } @llvm.usub.with.overflow.i64(i64 %20, i64 %21), !dbg !91 %23 = extractvalue { i64, i1 } %22, 0, !dbg !91 %24 = extractvalue { i64, i1 } %22, 1, !dbg !91 br i1 %24, label %OverflowFail1, label %OverflowOk2, !dbg !91 OverflowFail1: ; preds = %OverflowOk %25 = load i8*, i8** getelementptr inbounds ({ i8*, i64 }, { i8*, i64 }* @5, i32 0, i32 0), align 8, !dbg !91 %26 = load i64, i64* getelementptr inbounds ({ i8*, i64 }, { i8*, i64 }* @5, i32 0, i32 1), align 8, !dbg !91 _call coldcc void @zigpanic(i8* %25, i64 %26), !dbg !91 unreachable, !dbg !91 OverflowOk2: ; preds = %OverflowOk store i64 %23, i64* %b, align 8, !dbg !92 call void @llvm.dbg.declare(metadata i64* %b, metadata !66, metadata !32), !dbg !92 %27 = load i64, i64* %destspaceleft, align 8, !dbg !93 %28 = load i64, i64* %b, align 8, !dbg !94 %29 = icmp ult i64 %27, %28, !dbg !95 br i1 %29, label %Then, label %Else, !dbg !95 OverflowFail3: ; preds = %EndIf %30 = load i8*, i8** getelementptr inbounds ({ i8*, i64 }, { i8*, i64 }* @5, i32 0, i32 0), align 8, !dbg !87 %31 = load i64, i64* getelementptr inbounds ({ i8*, i64 }, { i8*, i64 }* @5, i32 0, i32 1), align 8, !dbg !87 _call coldcc void @zigpanic(i8* %30, i64 %31), !dbg !87 unreachable, !dbg !87 OverflowOk4: ; preds = %EndIf store i64 %15, i64* %index, align 8, !dbg !87 %32 = load i64, i64* %srcindex, align 8, !dbg !96 %33 = load i64, i64* %copyamt, align 8, !dbg !97 %34 = call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 %32, i64 %33), !dbg !98 %35 = extractvalue { i64, i1 } %34, 0, !dbg !98 %36 = extractvalue { i64, i1 } %34, 1, !dbg !98 br i1 %36, label %OverflowFail5, label %OverflowOk6, !dbg !98 OverflowFail5: ; preds = %OverflowOk4 %37 = load i8*, i8** getelementptr inbounds ({ i8*, i64 }, { i8*, i64 }* @5, i32 0, i32 0), align 8, !dbg !98 %38 = load i64, i64* getelementptr inbounds ({ i8*, i64 }, { i8*, i64 }* @5, i32 0, i32 1), align 8, !dbg !98 _call coldcc void @zigpanic(i8* %37, i64 %38), !dbg !98 unreachable, !dbg !98 OverflowOk6: ; preds = %OverflowOk4 store i64 %35, i64* %srcindex, align 8, !dbg !98 br label %WhileCond, !dbg !73 } ; Function Attrs: nobuiltin noreturn nounwind define internal fastcc void @panic(%"[]u8"* byval nonnull readonly) unnamedaddr #2 !dbg !99 { Entry: call void @llvm.dbg.declare(metadata %"[]u8"* %0, metadata !101, metadata !32), !dbg !102 br label %WhileCond, !dbg !103 WhileCond: ; preds = %WhileCond, %Entry br label %WhileCond, !dbg !103 } ; Function Attrs: argmemonly nounwind declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i32, i1) #3 ; Function Attrs: nounwind readnone speculatable declare void @llvm.dbg.declare(metadata, metadata, metadata) #4 ; Function Attrs: nounwind readnone speculatable declare { i64, i1 } @llvm.usub.with.overflow.i64(i64, i64) #4 ; Function Attrs: nounwind readnone speculatable declare { i64, i1 } @llvm.uadd.with.overflow.i64(i64, i64) #4 attributes #0 = { nobuiltin nounwind } attributes #1 = { cold nobuiltin noreturn nounwind } attributes #2 = { nobuiltin noreturn nounwind } attributes #3 = { argmemonly nounwind } attributes #4 = { nounwind readnone speculatable } !llvm.module.flags = !{!0} !llvm.dbg.cu = !{!1} !0 = !{i32 2, !"Debug Info Version", i32 3} !1 = distinct !DICompileUnit(language: DWLANGC99, file: !2, producer: "zig 0.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !3, globals: !12) !2 = !DIFile(filename: "test", directory: ".") !3 = !{!4} !4 = !DICompositeType(tag: DWTAGenumerationtype, name: "GlobalLinkage", scope: !5, file: !5, line: 138, baseType: !6, size: 8, align: 8, elements: !7) !5 = !DIFile(filename: "builtin.zig", directory: "/home/andy/dev/zig/build-llvm5-debug/zig-cache") !6 = !DIBasicType(name: "u3", size: 8, encoding: DWATEunsigned) !7 = !{!8, !9, !10, !11} !8 = !DIEnumerator(name: "Internal", value: 0) !9 = !DIEnumerator(name: "Strong", value: 1) !10 = !DIEnumerator(name: "Weak", value: 2) !11 = !DIEnumerator(name: "LinkOnce", value: 3) !12 = !{!13} !13 = !DIGlobalVariableExpression(var: !14) _!14 = distinct !DIGlobalVariable(name: "zigpanicimplementationprovided", _linkageName: "zigpanicimplementationprovided", scope: !5, file: !5, line: 201, type: !15, isLocal: true, isDefinition: true) !15 = !DIBasicType(name: "bool", size: 8, encoding: DWATEboolean) !16 = distinct !DISubprogram(name: "entry", scope: !17, file: !17, type: !18, isLocal: false, isDefinition: true, isOptimized: true, unit: !1, variables: !21) !17 = !DIFile(filename: "test.zig", directory: "/home/andy/dev/zig/build-llvm5-debug") !18 = !DISubroutineType(types: !19) !19 = !{!20} !20 = !DIBasicType(name: "void", encoding: DWATEunsigned) !21 = !{!22} !22 = !DILocalVariable(name: "bytes", scope: !23, file: !17, line: 2, type: !24) !23 = distinct !DILexicalBlock(scope: !16, file: !17, line: 1, column: 19) !24 = !DICompositeType(tag: DWTAGstructuretype, name: "[]u8", size: 128, align: 64, elements: !25) !25 = !{!26, !29} !26 = !DIDerivedType(tag: DWTAGmember, name: "ptr", scope: !24, baseType: !27, size: 64, align: 64) !27 = !DIDerivedType(tag: DWTAGpointertype, name: "&u8", baseType: !28, size: 64, align: 64) !28 = !DIBasicType(name: "u8", size: 8, encoding: DWATEunsignedchar) !29 = !DIDerivedType(tag: DWTAGmember, name: "len", scope: !24, baseType: !30, size: 64, align: 64, offset: 64) !30 = !DIBasicType(name: "usize", size: 64, encoding: DWATEunsigned) !31 = !DILocation(line: 2, column: 5, scope: !23) !32 = !DIExpression() !33 = !DILocation(line: 3, column: 10, scope: !34) !34 = distinct !DILexicalBlock(scope: !23, file: !17, line: 2, column: 5) !35 = !DILocation(line: 1, column: 19, scope: !16) _!36 = distinct !DISubprogram(name: "zigpanic", scope: !37, file: !37, line: 7, type: !38, isLocal: false, isDefinition: true, scopeLine: 7, isOptimized: true, unit: !1, variables: !40) !37 = !DIFile(filename: "zigrt.zig", directory: "/home/andy/dev/zig/build-llvm5-debug/lib/zig/std/special") !38 = !DISubroutineType(types: !39) !39 = !{!20, !27, !30} !40 = !{!41, !42} !41 = !DILocalVariable(name: "messageptr", arg: 1, scope: !36, file: !37, line: 7, type: !27) !42 = !DILocalVariable(name: "messagelen", arg: 2, scope: !43, file: !37, line: 7, type: !30) !43 = distinct !DILexicalBlock(scope: !36, file: !37, line: 7, column: 30) !44 = !DILocation(line: 7, column: 30, scope: !36) !45 = !DILocation(line: 7, column: 54, scope: !43) !46 = !DILocation(line: 12, column: 48, scope: !47) !47 = distinct !DILexicalBlock(scope: !48, file: !37, line: 11, column: 54) !48 = distinct !DILexicalBlock(scope: !49, file: !37, line: 7, column: 86) !49 = distinct !DILexicalBlock(scope: !43, file: !37, line: 7, column: 54) !50 = !DILocation(line: 12, column: 43, scope: !47) !51 = !DILocation(line: 12, column: 31, scope: !47) !52 = distinct !DISubprogram(name: "write", scope: !17, file: !17, line: 6, type: !53, isLocal: true, isDefinition: true, scopeLine: 6, isOptimized: true, unit: !1, variables: !56) !53 = !DISubroutineType(types: !54) !54 = !{!20, !55} !55 = !DIDerivedType(tag: DWTAGpointertype, name: "&[]const u8", baseType: !24, size: 64, align: 64) !56 = !{!57, !58, !61, !63, !66, !68} !57 = !DILocalVariable(name: "bytes", arg: 1, scope: !52, file: !17, line: 6, type: !24) !58 = !DILocalVariable(name: "index", scope: !59, file: !17, line: 7, type: !30) !59 = distinct !DILexicalBlock(scope: !60, file: !17, line: 6, column: 33) !60 = distinct !DILexicalBlock(scope: !52, file: !17, line: 6, column: 14) !61 = !DILocalVariable(name: "srcindex", scope: !62, file: !17, line: 9, type: !30) !62 = distinct !DILexicalBlock(scope: !59, file: !17, line: 7, column: 5) !63 = !DILocalVariable(name: "destspaceleft", scope: !64, file: !17, line: 12, type: !30) !64 = distinct !DILexicalBlock(scope: !65, file: !17, line: 11, column: 35) !65 = distinct !DILexicalBlock(scope: !62, file: !17, line: 9, column: 5) !66 = !DILocalVariable(name: "b", scope: !67, file: !17, line: 13, type: !30) !67 = distinct !DILexicalBlock(scope: !64, file: !17, line: 12, column: 9) !68 = !DILocalVariable(name: "copyamt", scope: !69, file: !17, line: 14, type: !30) !69 = distinct !DILexicalBlock(scope: !67, file: !17, line: 13, column: 9) !70 = !DILocation(line: 6, column: 14, scope: !52) !71 = !DILocation(line: 7, column: 5, scope: !59) !72 = !DILocation(line: 9, column: 5, scope: !62) !73 = !DILocation(line: 11, column: 5, scope: !65) !74 = !DILocation(line: 11, column: 12, scope: !65) !75 = !DILocation(line: 11, column: 29, scope: !65) !76 = !DILocation(line: 11, column: 22, scope: !65) !77 = !DILocation(line: 12, column: 37, scope: !64) !78 = !DILocation(line: 12, column: 35, scope: !64) !79 = !DILocation(line: 11, column: 5, scope: !60) !80 = !DILocation(line: 14, column: 51, scope: !69) !81 = !DILocation(line: 14, column: 26, scope: !69) !82 = !DILocation(line: 14, column: 72, scope: !69) !83 = !DILocation(line: 14, column: 9, scope: !69) !84 = !DILocation(line: 15, column: 9, scope: !85) !85 = distinct !DILexicalBlock(scope: !69, file: !17, line: 14, column: 9) !86 = !DILocation(line: 15, column: 18, scope: !85) !87 = !DILocation(line: 15, column: 15, scope: !85) !88 = !DILocation(line: 12, column: 9, scope: !64) !89 = !DILocation(line: 13, column: 24, scope: !67) !90 = !DILocation(line: 13, column: 31, scope: !67) !91 = !DILocation(line: 13, column: 29, scope: !67) !92 = !DILocation(line: 13, column: 9, scope: !67) !93 = !DILocation(line: 14, column: 30, scope: !69) !94 = !DILocation(line: 14, column: 48, scope: !69) !95 = !DILocation(line: 14, column: 46, scope: !69) !96 = !DILocation(line: 16, column: 9, scope: !85) !97 = !DILocation(line: 16, column: 22, scope: !85) !98 = !DILocation(line: 16, column: 19, scope: !85) !99 = distinct !DISubprogram(name: "panic", scope: !17, file: !17, line: 20, type: !53, isLocal: true, isDefinition: true, scopeLine: 20, isOptimized: true, unit: !1, variables: !100) !100 = !{!101} !101 = !DILocalVariable(name: "msg", arg: 1, scope: !99, file: !17, line: 20, type: !24) !102 = !DILocation(line: 20, column: 14, scope: !99) !103 = !DILocation(line: 20, column: 45, scope: !104) !104 = distinct !DILexicalBlock(scope: !105, file: !17, line: 20, column: 43) !105 = distinct !DILexicalBlock(scope: !99, file: !17, line: 20, column: 14) is the following, however clang 5 with assertions on does not hit the assertion when run on this IR: Any pointers would be appreciated.

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