如何通过 LLVM C++ 调用 Objective-C 块API？
举例来说，我有一个 Objective-C 编译模块，其中包含如下内容：
typedef bool (^BoolBlock)(void);
BoolBlock returnABlock(void)
{
return Block_copy(^bool(void){
printf("Block executing.\n");
return YES;
});
}
...然后，使用 LLVM C++ API，加载该模块并创建一个 CallInst 来调用 returnABlock() 函数：
Function *returnABlockFunction = returnABlockModule->getFunction(std::string("returnABlock"));
CallInst *returnABlockCall = CallInst::Create(returnABlockFunction, "returnABlockCall", entryBlock);
如何调用通过 returnABlockCall 对象返回的块？
Say, for example, I have an Objective-C compiled Module that contains something like the following:
typedef bool (^BoolBlock)(void);
BoolBlock returnABlock(void)
{
return Block_copy(^bool(void){
printf("Block executing.\n");
return YES;
});
}
...then, using the LLVM C++ API, I load that Module and create a CallInst to call the returnABlock() function:
Function *returnABlockFunction = returnABlockModule->getFunction(std::string("returnABlock"));
CallInst *returnABlockCall = CallInst::Create(returnABlockFunction, "returnABlockCall", entryBlock);
How can I then invoke the Block returned via the returnABlockCall object?
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恐怕这不是一个简单的答案。前端将块降低到对块运行时的调用。对于 clang，相关代码位于
clang/lib/CodeGen/CGBlocks.[h|cpp]。值得在 cfe-dev 列表上询问是否有办法将此代码分解出来以便在其他前端中重用。
Not an easy answer here, I'm afraid. Blocks are lowered by the front-end into calls into the blocks runtime. In the case of clang, the relevant code is at
clang/lib/CodeGen/CGBlocks.[h|cpp].It would be worth asking on the cfe-dev list if there's a way to factor this code out for reuse in other front-ends.
在 C 中，我只是将块分配给的 var 视为函数指针。以您的代码为例，在将函数的结果分配给“returnABlockCall”之后，您可以只写：
并且它应该可以工作。
警告，这在 C++ 中未经测试，但我认为没有理由它不起作用。
In C, I just act as if the var I assigned the block to was a function pointer. Using your code as an example, after you assign the result of the function to "returnABlockCall", you could just write:
and it should work.
Warning, this is untested in C++, but I see no reason why it wouldn't work.