similar to: [LLVMdev] Inconsistent use of is_stmt flag in .debug_line

It appears to me that from this: https://iis-git.ee.ethz.ch/H2020-Compiler/llvm/commit/1d68fc5021ca8c704e21f171d98bb18eb396a7fa That LLVM basically emits DWARF expressions where is_stmt is true only "once per line". Is that still true? Is there an option to emit more than one per line? Thanks all. -Roger Pack- refs: https://github.com/crystal-lang/crystal/pull/8499

Hi All , We have a scenario in our debugger to handle the file index in the debug_ine info like $llvm-dwarfdump -debug-line test.o file_names[ 1]: name: "test.cpp" dir_index: 0 mod_time: 0x00000000 length: 0x00000000 file_names[ 2]: name: "test.cpp" dir_index: 1 mod_time: 0x00000000 length: 0x00000000

I mean, we just skip over instructions without a DebugLoc: void CodeViewDebug::beginInstruction(const MachineInstr *MI) { DebugHandlerBase::beginInstruction(MI); // Ignore DBG_VALUE locations and function prologue. if (!Asm || !CurFn || MI->isDebugValue() || MI->getFlag(MachineInstr::FrameSetup)) return; DebugLoc DL = MI->getDebugLoc(); if (DL == PrevInstLoc || !DL)

Try using $PWD/test.cpp on the clang command line. I am seeing the duplicate DIFile entries, but not yet able to reproduce a .debug_line section with multiple directory entries. --paulr From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of Tomar, Sourabh Singh via llvm-dev Sent: Tuesday, September 1, 2020 1:07 PM To: Umesh Kalappa <umesh.kalappa0 at gmail.com>; cfe-dev at

When compiling code with lld -O0 --lto-O0 --eh-frame-hdr I get strange interleaved line info all over the place: ... 0x00000000000595ac 22 11 1 0 0 is_stmt 0x00000000000595bc 25 7 1 0 0 is_stmt <<< 0x00000000000595c0 22 11 1 0 0 is_stmt 0x00000000000595c4 25 7 1 0 0 is_stmt <<< 0x00000000000595c8 26 7 1 0 0 is_stmt but the code only has 1 reference to line 25 and the

Isn't this a typcial situation when the is_stmt field in the DWARF line table should be used? If we set is_stmt=0 for the instruction loading the constant, then a debugger can choose not to stop on that instruction when doing "step" on source level. That way we can keep the original source location for a ConstantSDNode, but also telling the debugger that this isn't a recommended

Howdy, I'm working on writing a dependence analyzer (rather like what LoopDependenceAnalysis wants to be, except a bit more general). While this is a problem of many parts, I'm currently focusing on finding pairs of memory references to test for dependence. Consider this contrived C code: double test2(int n, double *restrict A, double *restrict B, bool flag) { if (flag) { A[0] =

On Wed, Dec 7, 2016 at 3:39 PM, Robinson, Paul via llvm-dev < llvm-dev at lists.llvm.org> wrote: > >> I don't know what the right, if any, solution to this is - but I > >> thought I should bring it up in case you or anyone else wanted to > >> puzzle it over & see if the competing needs/desires might need to be > >> considered. > > One thing

----- Original Message ----- > From: "Andrea Di Biagio" <andrea.dibiagio at gmail.com> > To: "Paul Robinson" <paul.robinson at sony.com> > Cc: "Hal Finkel" <hfinkel at anl.gov>, "David Blaikie" > <dblaikie at gmail.com>, llvm-dev at lists.llvm.org > Sent: Thursday, December 15, 2016 9:05:00 AM > Subject: Re:

There should be a line-table entry for the end of the function, which appears to be missing from the dump you provided. llvm-dwarfdump should report this address with 'end_sequence' in the Flags. Are you using a different dumper? I am not sure but my guess would be that inline data is not represented in the line table. The line table's primary purpose is to inform the debugger

Sorry, this is the attachment. 2014-02-19 15:08 GMT+08:00 杨勇勇 <triple.yang at gmail.com>: > Thank you. > > Here is an example and the attchment contains extra files including object > file and executable file. > I want to print for example the value of "a", but lldb command "frame > variable a" displays "0" and so does "b", and

Hi, For my project, I am using internal llvm class functions to print the filename and directory associated with an instruction from the debug information. With a recent checkout of llvm and clang (svn revision 129445), the following custom code (e.g. in a pass that prints directory info for all instructions) returns the filename iso. directory whenever Scope refers to a lexical block: if (const

Hi there, I was trying to see what kind of informations I can get on dependence/alias analysis from the trunk llvm, and stumbled upon two potencial problems. First of all, the most recent documentation I could find online <http://llvm.org/docs/AliasAnalysis.html> suggests the use of options not available on the code (like enabling globalsmodref-aa, or count-aa, for example). Is there a more

I'm not familiar with the target instruction set, but if "MOV PC, R0" is not a return instruction, I'm guessing that the sequence starting at A39C is a dispatch through a jump table. The jump table would be considered part of the instruction stream and included in the scope of the line table. This is not a case where you would see end_sequence; my mistake. The line table does

1. I would like to know why there is a difference in function prologue generated for same function with clang and gcc. Compiler options used for gcc were as follows: arm-linux-gnueabi-gcc all-types.c -w -march=armv7-a -mtune=cortex-a8 -mfloat-abi=softfp -mfpu=vfp -g -lm -o all-types_gcc Compiler options used for clang were as follows: /usr/local/bin/clang all-types.c -w

Here are some issues that I am unclear about. What would be great is if the answers could be incorporated into the comments and documentation for DIFactory and DebugInfo.h: 1) What types of DIScope are valid arguments for DebugLoc::get()? The method takes an MDNode* argument, so looking at the function signature is no help. For example, DIFile is a subtype of DIScope, however looking at

Hi all, I haven't seen a proposal for an optimised-code debugging experience Round Table yet so here goes! Please let me know if you are interested by emailing me at: orlando.hyams at sony.com Below is a non-exhaustive list of possible topics. Feel free to include any preferences and suggestions in your response. a. Line tables: 1. Can we fix is_stmt? 2. Is prologue_end

Hi Eric & Orlando, It’s great to see interest in a lot of different aspects of debug info. At the same time, I’m concerned about a risk to making the topic so broad that we don’t have time to get through all the things people want to get through. I’m thinking there’s a different way to slice the topics, hopefully without much overlap, but that will allow a bit more focus. No doubt a lot of

On Fri, 2018-02-09 at 12:54 +0000, David Woodhouse wrote: > On Fri, 2018-02-09 at 10:36 +0000, David Woodhouse wrote: > >  > > Did you get anywhere with the function attribute? Having isolated the > > next boot failure to "it goes away if I compile io_apic.c without > > retpoline", bisecting it per-function would help to further delay the > > bit where I

FWIW: Debug information on constants feels odd to me. They are just values not something that is executed so conceptually I would not expect them to "happen" at a specific time/place in the program. That said most numbers are copied into registers or stored into memory and that is of course an interesting action. So in the original example I would hope to see debug info on whatever