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Implement external function support 

llvm-svn: 4902
This commit is contained in:
Chris Lattner 2002-12-04 06:04:07 +00:00
parent 4843ebc4ba
commit 0ded70ec7c
1 changed files with 11 additions and 1 deletions
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12
llvm/tools/jello/VM.cpp
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@ -10,6 +10,7 @@
#include "llvm/CodeGen/MachineCodeEmitter.h" #include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/Function.h" #include "llvm/Function.h"
#include <iostream> #include <iostream>
#include <dlfcn.h> // dlsym access
VM::~VM() { VM::~VM() {
@ -58,6 +59,7 @@ const std::string &VM::getFunctionReferencedName(void *RefAddr) {
return FunctionRefs[RefAddr]->getName(); return FunctionRefs[RefAddr]->getName();
} }
static void NoopFn() {}
/// getPointerToFunction - This method is used to get the address of the /// getPointerToFunction - This method is used to get the address of the
/// specified function, compiling it if neccesary. /// specified function, compiling it if neccesary.
@ -67,7 +69,15 @@ void *VM::getPointerToFunction(Function *F) {
if (Addr) return Addr; if (Addr) return Addr;
if (F->isExternal()) { if (F->isExternal()) {
assert(0 && "VM::getPointerToFunction: Doesn't handle external fn's yet!"); // If it's an external function, look it up in the process image...
void *Ptr = dlsym(0, F->getName().c_str());
if (Ptr == 0) {
std::cerr << "WARNING: Cannot resolve fn '" << F->getName()
<< "' using a dummy noop function instead!\n";
Ptr = (void*)NoopFn;
}
return Addr = Ptr;
} }
// JIT all of the functions in the module. Eventually this will JIT functions // JIT all of the functions in the module. Eventually this will JIT functions