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Implement external function support
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4902 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -10,6 +10,7 @@
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#include "llvm/CodeGen/MachineCodeEmitter.h"
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#include "llvm/Function.h"
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#include <iostream>
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#include <dlfcn.h> // dlsym access
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VM::~VM() {
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@ -58,6 +59,7 @@ const std::string &VM::getFunctionReferencedName(void *RefAddr) {
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return FunctionRefs[RefAddr]->getName();
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}
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static void NoopFn() {}
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/// getPointerToFunction - This method is used to get the address of the
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/// specified function, compiling it if neccesary.
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@ -67,7 +69,15 @@ void *VM::getPointerToFunction(Function *F) {
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if (Addr) return Addr;
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if (F->isExternal()) {
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assert(0 && "VM::getPointerToFunction: Doesn't handle external fn's yet!");
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// If it's an external function, look it up in the process image...
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void *Ptr = dlsym(0, F->getName().c_str());
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if (Ptr == 0) {
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std::cerr << "WARNING: Cannot resolve fn '" << F->getName()
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<< "' using a dummy noop function instead!\n";
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Ptr = (void*)NoopFn;
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}
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return Addr = Ptr;
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}
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// JIT all of the functions in the module. Eventually this will JIT functions
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