callvm is a commad line calculator that generates LLVM IR code.
git clone https://github.com/agatan/callvm.git
mkdir build && cd build
cmake ..
make
This application depends on LLVM and Boost. If you haven't installed them, cmake will be failed.
./callvm [output-file-name]
After you execute the command, this application output like this.
user>
And you type some arithmetic expressions, this application will return LLVM IR that include the value of your expressions.
user> 1 + 2
(1 + 2)
this is an integer expression
; ModuleID = 'toplevel'
define i32 @func0() {
entry:
ret i32 3
}
user> 3.0 * (4 - 1)
(3.000000 * (4 - 1))
this is an float expression
; ModuleID = 'toplevel'
define i32 @func0() {
entry:
ret i32 3
}
define float @func1() {
entry:
ret float 9.000000e+00
}
user>
When you want to quit this, you can type quit.
This application will be stopped and LLVM IR that contains all of your expressions will be output to the file.
This generates LLVM IR, so you can use those values from C.
main.c:
#include <stdio.h>
float func0();
int main(int argc, char **argv)
{
printf("%f\n", func0());
}and calc.ll:
; ModuleID = 'toplevel'
define float @func0() {
entry:
ret float 2.500000e+01
}
First, generate object file from LLVM IR.
llc -filetype=obj -o calc.o calc.ll
And then, compile main.c with calc.o
clang main.c calc.o