[llvm-dev] Convert Function Pointer Call to Function Call at the IR Level (original) (raw)

mayuyu.io via llvm-dev llvm-dev at lists.llvm.org
Sat Aug 18 00:26:13 PDT 2018

Yep. We encountered similar issue a while ago due to IR linking. A bitcasted function argument would do

Zhang

在 2018年8月17日，19:30，Ahmad Nouralizadeh Khorrami via llvm-dev <llvm-dev at lists.llvm.org> 写道：

Hi. It seems that struct.demuxer.2657* is different from struct.demuxer*. Should I add something like a bitcast before the call? Thanks!

On 16 August 2018 at 15:45, Ahmad Nouralizadeh Khorrami <ahmad.llvm at gmail.com> wrote: Hi, I want to convert a function pointer call in the IR of MPlayer to a function call. For example, I have the following line: ... %10 = tail call i32 %7(%struct.demuxer* nonnull %0, i32 %1, i8* %2) #7, !dbg !863222 ... I want to set the target which is stored in %7 to a real function called "demuxlavfcontrol()" with the following definition: ... define internal i32 @demuxlavfcontrol(%struct.demuxer.2657* nocapture readonly, i32, i8* nocapture) #0 !dbg !963916 { ... I wrote a function pass and found the mentioned function pointer call (here, stored in "CallInstr") and set the call target as follows: ... Module *theModule = F.getParent(); Function *targetFunc = theModule->getFunction("demuxlavfcontrol"); CalIInstr->setCalledFunction(targetFunc); ... "F" is the function containing the call. But it leads to the following error: ... Call parameter type does not match function signature! %struct.demuxer* %0 %struct.demuxer.2657* %10 = tail call i32 @demuxlavfcontrol(%struct.demuxer* nonnull %0, i32 %1, i8* %2) #7, !dbg !863222 LLVM ERROR: Broken function found, compilation aborted! ... The [names:types] of call operands before the change is: ... [:%struct.demuxer*] [:i32] [:i8*] [:i32 (%struct.demuxer*, i32, i8*)*] ... And after the change is: ... [:%struct.demuxer*] [:i32] [:i8*] [demuxlavfcontrol:i32 (%struct.demuxer.2657*, i32, i8*)*] ... How can I solve the problem? Thanks in advance!

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