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Add a framework for intercepting system calls

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6190 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2003-05-14 13:26:47 +00:00
parent 7cfee5b2bb
commit 6701a8603f
2 changed files with 54 additions and 21 deletions
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23
lib/ExecutionEngine/JIT/VM.cpp
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@@ -1,4 +1,4 @@
//===-- jello.cpp - LLVM Just in Time Compiler ----------------------------===//
//===-- VM.cpp - LLVM Just in Time Compiler -------------------------------===//
//
// This tool implements a just-in-time compiler for LLVM, allowing direct
// execution of LLVM bytecode in an efficient manner.
@@ -9,8 +9,6 @@
#include "llvm/Target/TargetMachine.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/Function.h"
#include <dlfcn.h> // dlsym access
VM::~VM() {
delete MCE;
@@ -50,27 +48,10 @@ void *VM::resolveFunctionReference(void *RefAddr) {
}
const std::string &VM::getFunctionReferencedName(void *RefAddr) {
assert(FunctionRefs[RefAddr] && "Function address unknown!");
return FunctionRefs[RefAddr]->getName();
}
static void NoopFn() {}
/// getPointerToNamedFunction - This method returns the address of the specified
/// function by using the dlsym function call. As such it is only useful for
/// resolving library symbols, not code generated symbols.
///
void *VM::getPointerToNamedFunction(const std::string &Name) {
// If it's an external function, look it up in the process image...
void *Ptr = dlsym(0, Name.c_str());
if (Ptr == 0) {
std::cerr << "WARNING: Cannot resolve fn '" << Name
<< "' using a dummy noop function instead!\n";
Ptr = (void*)NoopFn;
}
return Ptr;
}
/// getPointerToFunction - This method is used to get the address of the
/// specified function, compiling it if neccesary.
///