How to dump llvm module to .ll file

Question

I see from this question there is a way to dump a module to bitcode (.bc), but I would like to dump the IR to a .ll file so that I can view the IR.

I know llvm-dis can convert .bc to .ll but in my case it does not work. I have written some passes that transform the module in a way that llvm-dis fails to convert the bitcode to IR.

Is there an API similar to LLVMWriteBitcodeToFile that lets me dump a module to IR directly?

[print()](https://llvm.org/doxygen/classllvm_1_1Module.html#a8ee5166cba8576e41617fc96aec1fb85)? — arnt, Feb 13 '20 at 20:14

score 0 · Answer 1 · answered Feb 14 '20 at 13:14

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You can use opt to do that. e.g.,

opt -S test.bc -o test.ll

answered Feb 14 '20 at 13:14

A. K.

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This fails for the same reasons that `llvm-dis` does not work. – Increasingly Idiotic May 07 '20 at 18:17

score 0 · Accepted Answer · answered May 07 '20 at 18:17

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From arnt's comment, just use llvm::Module::print()

answered May 07 '20 at 18:17

Increasingly Idiotic

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I use `llvmmodule->print(ostream, nullptr);` but why my llvm::Module only prints `source_filename` but nothing else? – linrongbin Jul 07 '20 at 09:34

How to dump llvm module to .ll file

2 Answers2