[bugfix] fix the undeclared identifier 'f' #14879
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src/target/llvm/codegen_cpu.cc
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| @@ -466,13 +466,14 @@ llvm::Value* CodeGenCPU::CreateCallExtern(Type ret_type, String global_symbol, | |||
| llvm::FunctionType* ftype = llvm::FunctionType::get(GetLLVMType(ret_type), arg_types, false); | |||
| // Check if it is available in global function table as injected function. | |||
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| llvm::Function* f = module_->getFunction(MakeStringRef(global_symbol)); | |||
| auto callee = [&]() -> llvm::Value* { | |||
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callee is only used when #if TVM_LLVM_VERSION >= 90 is true. So, could we just move the whole callee initialization lambda into that branch of the conditional directive?
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The callee was intended to be used in both cases, with the #if normalizing callee into either a llvm::Value* or a llvm::FunctionCallee depending on the LLVM version. I think we should keep the definition of callee outside the conditional, but should replace auto ext_callee = f; with auto ext_callee = callee;. That way, callee is initialized as appropriate module/context/external function pointer in both branches, and is then converted to the type required by the LLVM API inside the directive.
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That makes more sense, thanks.
src/target/llvm/codegen_cpu.cc
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| @@ -466,13 +466,14 @@ llvm::Value* CodeGenCPU::CreateCallExtern(Type ret_type, String global_symbol, | |||
| llvm::FunctionType* ftype = llvm::FunctionType::get(GetLLVMType(ret_type), arg_types, false); | |||
| // Check if it is available in global function table as injected function. | |||
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| llvm::Function* f = module_->getFunction(MakeStringRef(global_symbol)); | |||
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Instead of exposing llvm::Function* f outside the scope, could we instead replace auto ext_callee = f; on line 490 with auto ext_callee = callee;? The current change would allow compilation, but would skip the optional pointer-cast of the callee.
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Or, alternatively, I think we could simplify it by returning builder_->CreateCall(ftype, callee, arg_values);. This method is available as far back as 3.7.0 (commit link), and since TVM requires LLVM 4.0 or higher, we would avoid needing the #if directive altogether.
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@Lunderberg @quic-sanirudh Thanks for your guidance. I have corrected the patch, could you recheck the code change again?
* fix the undeclared identifier 'f' * Update codegen_cpu.cc
This pr fixed the source code build problem found in issue #14878
The variable 'f' is a local variable that is inviable for the outside code. This pr moved the 'f' definition to the outside of the condition and fix the crash.
cc @Lunderberg @kparzysz-quic