[LLVMdev] freeing alloca'd variables before function exits

[Ali Javadi]

Hi,

In my llvm code I want to create some function calls. The function prototype is as follows: 
  
int memoize ( char *function_name, 
               		int *int_params, unsigned num_ints,
	               double *double_params, unsigned num_doubles)

In order to create these calls I do the following for example:

  %88 = alloca [7 x i8]
  store volatile [7 x i8] c"ORACLE\00", [7 x i8]* %88
  %89 = getelementptr [7 x i8]* %88, i32 0, i32 0
  
  %90 = alloca [1 x i32]
  %91 = getelementptr inbounds [1 x i32]* %90, i32 0, i32 0
  store volatile i32 3, i32* %91
  %92 = getelementptr inbounds [1 x i32]* %90, i32 0, i32 0
  
  %93 = alloca [0 x double]
  %94 = getelementptr inbounds [0 x double]* %93, i32 0, i32 0

  %95 = call i32 @memoize(i8* %89, i32* %92, i32 1, double* %94, i32 0)

This works, but I need to create *many* such function calls in one "parent" function, and eventually all the "alloca" instructions add up to overflowing the stack. So I have two questions:

a) Is it possible to create the arrays for my function call args without using the alloca instruction (maybe use heap)?
b) If not, can I release those alloca'd spaces during the function execution and not after it returns?

Thanks,
Ali
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