The Kite Compiler: part 2 of many
Written by Mooneer Salem on Friday 14th of May, 2010 in General
This week, I worked some more on learning how LLVM works. I’ve created basic method and constant value classes to represent those values in the AST, and wrote a test app to ensure this works. I’m happy to tell you all that I have some initial success doing this. :)
Sample application:
using namespace kite::parse_tree;
int main (int argc, char * const argv[])
{
// TODO: kite compiler driver.
InitializeNativeTarget();
llvm_start_multithreaded();
ConstantValue<double> *constant = new ConstantValue<double>(42.0);
MethodValue *method = new MethodValue("life_universe_everything");
method->push_instruction(constant);
CompilerState *state = new CompilerState();
LLVMContext &context = getGlobalContext();
state->push_module(new Module("test_module", context));
Value *v = method->codegen(state);
Module *mod = state->pop_module();
ExecutionEngine *engine = EngineBuilder(mod).create();
void *fptr = engine->getPointerToFunction(static_cast<Function*>(v));
double (*FP)() = (double (*)())(intptr_t)fptr;
std::cout << "Evaluates to: " << (*FP)() << std::endl;
mod->dump();
return 0;
}
Results:
[Session started at 2010-05-14 22:18:51 -0700.]
GNU gdb 6.3.50-20050815 (Apple version gdb-1461.2) (Fri Mar 5 04:43:10 UTC 2010)
Copyright 2004 Free Software Foundation, Inc.
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Type "show copying" to see the conditions.
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This GDB was configured as "x86_64-apple-darwin".tty /dev/ttys000
Loading program into debugger…
sharedlibrary apply-load-rules all
Program loaded.
run
[Switching to process 19016]
Running…
Evaluates to: 42
; ModuleID = 'test_module'
define double @life_universe_everything() {
entry:
ret double 4.200000e+01
}
Debugger stopped.
Program exited with status value:0.