在llvm中获取局部变量的实际值 [英] Getting actual value of local variables in llvm

问题描述

如果我有这个示例:

int a=0, b=0;

a和b是局部变量，并对其值进行任何修改，例如:

a and b are local variables and make any modifications in their values, such as:

a++;
b++;

在运行MCJIT期间，我需要获取此行代码中的值.

I need to get the value in this line code during running MCJIT.

我的意思是值不是Value类，而是实际的整数或任何类型的值.

I mean by value not Value class, but the actual integer or any type value.

推荐答案

您需要从JITed LLVM函数返回该值，以便从调用MCJIT的代码中检索该值.

You need to return the value from a JITed LLVM function in order to retrieve it from the code invoking MCJIT.

查看此万花筒示例.

相关代码在HandleTopLevelExpression()中:

The relevant code is in HandleTopLevelExpression():

if (FunctionAST *F = ParseTopLevelExpr()) {
  if (Function *LF = F->Codegen()) {
    // JIT the function, returning a function pointer.
    void *FPtr = TheHelper->getPointerToFunction(LF);

    // Cast it to the right type (takes no arguments, returns a double) so we
    // can call it as a native function.
    double (*FP)() = (double (*)())(intptr_t)FPtr;
    fprintf(stderr, "Evaluated to %f\n", FP());
  }
}

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