search for: appendinglinkage

...yLinkage: Keep one copy of function when linking (inline) > > LinkOnceODRLinkage: Same, but only replaced by something equivalent. > > WeakAnyLinkage: Keep one copy of named function when linking (weak) > > WeakODRLinkage: Same, but only replaced by something equivalent. > > AppendingLinkage: Special purpose, only applies to global arrays. > > InternalLinkage: Rename collisions when linking (static functions). > > PrivateLinkage: Like Internal, but omit from symbol table. > > ExternalWeakLinkage: ExternalWeak linkage description. > > CommonLinkage: Tentative def...

...Nodes only. The NamedMetadata is always implicitly typed as metadata. LLVM bitcode reader and writer will keep track of NamedMetadata in a Module. A module can use metadata that is not listed in any NamedMetadata value. A module can have multiple NamedMetadata values. NamedMetadata implicitly uses AppendingLinkage. A NamedMetadata value has zero uses. The NamedMetadata can be used to describe Front End specific types for the optimizer's use. Another potential use is to encode debug information for a global variable. I do not intend to make @llvm.used a NamedMetadata value. - Devang

Thanks Peter, this is very useful feedback. I did manage to change the behavior of LinkOnlyNeeded to correctly import all variables with AppendingLinkage. In fact, I discovered that there was already something fishy. A variable with AppendingLinkage would get imported correctly from the source module if the destination module already contained a definition for that variable and wouldn't be imported otherwiseŠ My local fix ensures that it correct...

...especially for the table at the end) may not come through in the copied text below well. Thanks! Teresa ThinLTO Symbol Linkage and Renaming 1 Introduction 2 Non-Discardable Values 2.2 Linkage Effects 2.2.2 ExternalLinkage 2.2.1 WeakAnyLinkage 2.2.2 WeakODRLinkage 2.2.3 AppendingLinkage 2.2.4 CommonLinkage 3 Linkonce Values 3.1 Linkage Effects 3.2 Importing Strategy 4 Static Values 4.1 Static Variables 4.2 Static Functions 4.3 Static Promotion 4.3.1 Linkage Effects 4.3.2 Renaming 5 Linkage Change Summary Table 1 Introduction This document describ...

...edMetadata is always implicitly typed as metadata. LLVM bitcode > reader and writer will keep track of NamedMetadata in a Module. A > module can use metadata that is not listed in any NamedMetadata value. > A module can have multiple NamedMetadata values. NamedMetadata > implicitly uses AppendingLinkage. And DefaultVisibility and a default Section and an Alignment of 1? GlobalValues carry some amount of baggage here. Dan

...try and solve the general case instead of just my own particular need. Unfortunately I can't think of any reasonable way to do it that doesn't involve polluting the IR language with a lot of special cases. Here are some ideas that I thought of and discarded: * Have a special "PostAppendingLinkage" type which acts just like "AppendingLinkage", except that it is guaranteed to come after all "AppendingLinkage" sections have been appended. Thus, you could use this to nail a sentinel value at the end of the list. Rejected because the linker has no control over the or...

...t I'm trying to do is create a "global appending" array. In compilation units that don't include "main", I generate it with: TheStack = new GlobalVariable( /*type=*/ stack_type, /*isConstant=*/ false, /*Linkage=*/ GlobalValue::AppendingLinkage, /*initializer=*/ 0, /*name=*/ "_stack_", /*parent=*/ TheModule ); Note that lack of an...

Talin wrote: > I'm trying to figure out how to do static initialization (like static > constructors in C++ or Java). I figured I would use appending linkage - > that is, for each module I'd generate a function that did all of the > static initialization for that module, and then I'd put a pointer to > that function in an array with appending linkage. Then my >

I'm trying to figure out how to do static initialization (like static constructors in C++ or Java). I figured I would use appending linkage - that is, for each module I'd generate a function that did all of the static initialization for that module, and then I'd put a pointer to that function in an array with appending linkage. Then my compiler-generated startup code would simply

...gt; > > > ThinLTO Symbol Linkage and Renaming > > > > > > 1 Introduction > > 2 Non-Discardable Values > > 2.2 Linkage Effects > > 2.2.2 ExternalLinkage > > 2.2.1 WeakAnyLinkage > > 2.2.2 WeakODRLinkage > > 2.2.3 AppendingLinkage > > 2.2.4 CommonLinkage > > 3 Linkonce Values > > 3.1 Linkage Effects > > 3.2 Importing Strategy > > 4 Static Values > > 4.1 Static Variables > > 4.2 Static Functions > > 4.3 Static Promotion > > 4.3.1 Linkage Effects &g...

...dMetadata is always implicitly typed as metadata. LLVM bitcode > reader and writer will keep track of NamedMetadata in a Module. A > module can use metadata that is not listed in any NamedMetadata value. > A module can have multiple NamedMetadata values. NamedMetadata > implicitly uses AppendingLinkage. A NamedMetadata value has zero > uses. > > The NamedMetadata can be used to describe Front End specific types for > the optimizer's use. Another potential use is to encode debug > information for a global variable. I do not intend to make @llvm.used > a NamedMetadata value...

Thanks for the hindsight. I am currently working on a patch/potential fix which introduces a new Linker::ImportIntrinsicGlobalVariables flag. The patch includes a unit test reproducing the problem. Hopefully, that will help getting more feedback. Note that it might take a while before I am allowed to upload the patch since I need approval from Autodesk Legal department. Cheers, Benoit Benoit

...ways implicitly typed as metadata. LLVM bitcode >> reader and writer will keep track of NamedMetadata in a Module. A >> module can use metadata that is not listed in any NamedMetadata value. >> A module can have multiple NamedMetadata values. NamedMetadata >> implicitly uses AppendingLinkage. > > And DefaultVisibility and a default Section and an Alignment of 1? > GlobalValues carry some amount of baggage here. I checked these three. The code generator does not generate any code for these NamedMetadata so we can just use vanilla default values here without any harm. - Devang

...Hotness: Unknown > - Name: printf > GUID: 7383291119112528047 > Hotness: Unknown > llvm.used: > - GUID: 15665353970260777610 > Kind: GlobalVar > Linkage: AppendingLinkage > NotEligibleToImport: true > Live: true > TypeIdMap: > WithGlobalValueDeadStripping: false > ... > > Thanks, > Charles > > > On Wed, Jun 7, 2017 at 12:38 PM, Teresa Johnson <tejohnson at google.com> > wrote: > >> >> &g...

...escribed in Section > 4.3.1. In all other cases the linkage in the original module stays the > same, and therefore is not noted in the table below. > > > > Note that there are no InternalLinkage, PrivateLinkage, > AvailableExternallyLinkage, LinkOnce*Linkage, Weak*Linkage, > AppendingLinkage and CommonLinkage declarations. There are no > ExternalWeakLinkage definitions. > > > > > +---------------------------------+------------------------------------------------+ > > | | Importing Module Linkage > | > > |...

Hello. I'm posting this question here, because there seem to be no LLD-specific mailing list. Sorry in advance if this is wrong one. I compile two C source with following command: clang -flto -o %name.bc %name.c LLVM is augmented with my custom pass, which amongst other things create a global with appending linkage: @myvar = appending constant [1 x [1 x i8]*] ... I also have another pass

On Wed, Jun 7, 2017 at 8:58 AM, Charles Saternos <charles.saternos at gmail.com > wrote: > Alright, now it outputs YAML in the following format: > > --- > NamedGlobalValueMap: > X: > - Kind: GlobalVar > Linkage: ExternalLinkage > NotEligibleToImport: false > Live: false > a: > - Kind:

...> > TheStack = new GlobalVariable( > /*type=*/ stack_type, > /*isConstant=*/ false, > /*Linkage=*/ GlobalValue::AppendingLinkage, > /*initializer=*/0, > /*name=*/ "_stack_", > /*parent=*/ TheModule > ); Shouldn't that create just a single dimensioned array? Note that "stack_size" is an integer with the value 1024. Finally, I have some confusion about how SSA works with L...

...GUID: 7383291119112528047 >>>>> Hotness: Unknown >>>>> llvm.used: >>>>> - GUID: 15665353970260777610 >>>>> Kind: GlobalVar >>>>> Linkage: AppendingLinkage >>>>> NotEligibleToImport: true >>>>> Live: true >>>>> TypeIdMap: >>>>> WithGlobalValueDeadStripping: false >>>>> ... >>>>> >>>>> Thanks, >>>>> Charles >...