├── CMakeLists.txt
├── LICENSE
├── README.md
└── main.cpp


/CMakeLists.txt:
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1 | cmake_minimum_required(VERSION 3.14)
2 | project(llvm_hello)
3 | 
4 | set(CMAKE_CXX_FLAGS -lLLVM) # link LLVM libs
5 | add_executable(llvm_hello main.cpp)


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/LICENSE:
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 1 | MIT License
 2 | 
 3 | Copyright (c) 2019 Максим Тарасов
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


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/README.md:
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 1 | # LLVM Hello
 2 | 
 3 | Hello world on LLVM C API example
 4 | 
 5 | ## Building
 6 | 
 7 | Install llvm and compile using cmake
 8 | 
 9 | ```bash
10 | mkdir build && cd build
11 | cmake ..
12 | cmake --build .
13 | ```
14 | 
15 | ## Running
16 | 
17 | After building run `llvm_hello` executable from build directory.
18 | 
19 | This executable generate `hello.ll` using LLVM C API
20 | 
21 | To run `hello.ll` file use this command ``lli hello.ll``


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/main.cpp:
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 1 | #include <llvm-c/Core.h>
 2 | 
 3 | int main() {
 4 |     // create context, module and builder
 5 |     LLVMContextRef context = LLVMContextCreate();
 6 |     LLVMModuleRef  module = LLVMModuleCreateWithNameInContext("hello", context);
 7 |     LLVMBuilderRef builder = LLVMCreateBuilderInContext(context);
 8 | 
 9 |     // types
10 |     LLVMTypeRef int_8_type = LLVMInt8TypeInContext(context);
11 |     LLVMTypeRef int_8_type_ptr = LLVMPointerType(int_8_type, 0);
12 |     LLVMTypeRef int_32_type = LLVMInt32TypeInContext(context);
13 | 
14 |     // puts function
15 |     LLVMTypeRef puts_function_args_type[] {
16 |         int_8_type_ptr
17 |     };
18 | 
19 |     LLVMTypeRef  puts_function_type = LLVMFunctionType(int_32_type, puts_function_args_type, 1, false);
20 |     LLVMValueRef puts_function = LLVMAddFunction(module, "puts", puts_function_type);
21 |     // end
22 | 
23 |     // main function
24 |     LLVMTypeRef  main_function_type = LLVMFunctionType(int_32_type, nullptr, 0, false);
25 |     LLVMValueRef main_function = LLVMAddFunction(module, "main", main_function_type);
26 | 
27 |     LLVMBasicBlockRef entry = LLVMAppendBasicBlockInContext(context, main_function, "entry");
28 |     LLVMPositionBuilderAtEnd(builder, entry);
29 | 
30 |     LLVMValueRef puts_function_args[] = {
31 |         LLVMBuildPointerCast(builder, // cast [14 x i8] type to int8 pointer
32 |                 LLVMBuildGlobalString(builder, "Hello, World!", "hello"), // build hello string constant
33 |                 int_8_type_ptr, "0")
34 |     };
35 | 
36 |     LLVMBuildCall2(builder, puts_function_type, puts_function, puts_function_args, 1, "i");
37 |     LLVMBuildRet(builder, LLVMConstInt(int_32_type, 0, false));
38 |     // end
39 | 
40 |     //LLVMDumpModule(module); // dump module to STDOUT
41 |     LLVMPrintModuleToFile(module, "hello.ll", nullptr);
42 | 
43 |     // clean memory
44 |     LLVMDisposeBuilder(builder);
45 |     LLVMDisposeModule(module);
46 |     LLVMContextDispose(context);
47 | 
48 |     return 0;
49 | }


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