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Now that we have ghost linkage, we can force resolution of external symbols

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immediately instead of lazily.

In this program, for example:

int main() {
  printf("hello world\n");
  printf("hello world\n");
  printf("hello world\n");
  printf("hello world\n");
}

We used to have to go through compilation callback 4 times (once for each
call to printf), now we don't go to it at all.

Thanks to Misha for noticing this, and for adding the initial ghost linkage
patches.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17864 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-11-15 23:20:04 +00:00
parent 0050ef8319
commit 02376e3f29
1 changed files with 8 additions and 3 deletions
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11
lib/ExecutionEngine/JIT/JITEmitter.cpp
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@ -213,9 +213,14 @@ void Emitter::emitWordAt(unsigned W, unsigned *Ptr) {
uint64_t Emitter::getGlobalValueAddress(GlobalValue *V) {
// Try looking up the function to see if it is already compiled, if not return
// 0.
if (isa<Function>(V))
return (intptr_t)TheJIT->getPointerToGlobalIfAvailable(V);
else {
if (Function *F = dyn_cast<Function>(V)) {
void *Addr = TheJIT->getPointerToGlobalIfAvailable(F);
if (Addr == 0 && F->hasExternalLinkage()) {
// Do not output stubs for external functions.
Addr = TheJIT->getPointerToFunction(F);
}
return (intptr_t)Addr;
} else {
return (intptr_t)TheJIT->getOrEmitGlobalVariable(cast<GlobalVariable>(V));
}
}