cg_llvm: Use LLVMDIBuilderCreateGlobalVariableExpression
#147608
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r? @nnethercote rustbot has assigned @nnethercote. Use |
Note that the code in `LLVMRustDIBuilderCreateStaticVariable` that tried to downcast `InitVal` appears to have been dead, because `llvm::ConstantInt` and `llvm::ConstantFP` are not subclasses of `llvm::GlobalVariable`.
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cg_llvmdebuginfo handling to use the LLVM-C API #134001This PR dismantles the somewhat complicated
LLVMRustDIBuilderCreateStaticVariablefunction, and replaces it with equivalent calls toLLVMDIBuilderCreateGlobalVariableExpressionandLLVMGlobalSetMetadata.A key difference is that the new code does not replicate the attempted downcast of
InitVal. As far as I can tell, those downcasts were actually dead, becausellvm::ConstantIntandllvm::ConstantFPare not subclasses ofllvm::GlobalVariable. I tried replacing those code paths with fatal errors, and was unable to induce failure in any of the relevant test suites I ran.I have also confirmed that if the calls to
create_static_variableare commented out, debuginfo tests will fail, demonstrating some amount of relevant test coverage.The new
DIBuildermethods have been added via an extension trait, not as inherent methods, to avoid impeding #142897.