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Add ability for external C code to get pointers to functions given their name.

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This us used by bugpoint -- when code is compiled to a shared object to be
JITted, it must use the JIT's lazy resolution method to find function addresses,
because some functions will not be available at .so load time, as they are in
the bytecode file.

llvm-svn: 7363
This commit is contained in:
Misha Brukman 2003-07-28 19:09:06 +00:00
parent 752c6f4548
commit c0193ca460
1 changed files with 15 additions and 3 deletions
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18
lib/ExecutionEngine/JIT/Emitter.cpp
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@ -11,14 +11,13 @@
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Function.h"
#include "llvm/Module.h"
#include "Support/Statistic.h"
#include <stdio.h>
static VM *TheVM = 0;
namespace {
Statistic<> NumBytes("jello", "Number of bytes of machine code compiled");
VM *TheVM = 0;
class Emitter : public MachineCodeEmitter {
// CurBlock - The start of the current block of memory. CurByte - The
@ -186,3 +185,16 @@ uint64_t Emitter::forceCompilationOf(Function *F) {
return (intptr_t)TheVM->getPointerToFunction(F);
}
// getPointerToNamedFunction - This function is used as a global wrapper to
// VM::getPointerToNamedFunction for the purpose of resolving symbols when
// bugpoint is debugging the JIT. In that scenario, we are loading an .so and
// need to resolve function(s) that are being mis-codegenerated, so we need to
// resolve their addresses at runtime, and this is the way to do it.
extern "C" {
void *getPointerToNamedFunction(const char *Name) {
Module &M = TheVM->getModule();
if (Function *F = M.getNamedFunction(Name))
return TheVM->getPointerToFunction(F);
return TheVM->getPointerToNamedFunction(Name);
}
}