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Add support for atexit handlers to the JIT, fixing 2003-05-14-AtExit.c

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llvm-svn: 6193
This commit is contained in:
Chris Lattner 2003-05-14 13:53:40 +00:00
parent 6f80e1b3c7
commit e7f979708b
3 changed files with 28 additions and 4 deletions
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19
lib/ExecutionEngine/JIT/Intercept.cpp
View File

@ -12,6 +12,17 @@
#include <dlfcn.h> // dlsym access
#include <iostream>
// AtExitList - List of functions registered with the at_exit function
static std::vector<void (*)()> AtExitList;
void VM::runAtExitHandlers() {
while (!AtExitList.empty()) {
void (*Fn)() = AtExitList.back();
AtExitList.pop_back();
Fn();
}
}
//===----------------------------------------------------------------------===//
// Function stubs that are invoked instead of raw system calls
//===----------------------------------------------------------------------===//
@ -21,12 +32,14 @@ static void NoopFn() {}
// jit_exit - Used to intercept the "exit" system call.
static void jit_exit(int Status) {
exit(Status); // Do nothing for now.
VM::runAtExitHandlers(); // Run at_exit handlers...
exit(Status);
}
// jit_atexit - Used to intercept the "at_exit" system call.
static int jit_atexit(void (*Fn)(void)) {
return atexit(Fn); // Do nothing for now.
AtExitList.push_back(Fn); // Take note of at_exit handler...
return 0; // Always successful
}
//===----------------------------------------------------------------------===//
@ -38,7 +51,7 @@ static int jit_atexit(void (*Fn)(void)) {
void *VM::getPointerToNamedFunction(const std::string &Name) {
// Check to see if this is one of the functions we want to intercept...
if (Name == "exit") return (void*)&jit_exit;
if (Name == "at_exit") return (void*)&jit_atexit;
if (Name == "atexit") return (void*)&jit_atexit;
// If it's an external function, look it up in the process image...
void *Ptr = dlsym(0, Name.c_str());

6
lib/ExecutionEngine/JIT/JIT.cpp
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@ -50,5 +50,9 @@ int VM::run(const std::string &FnName, const std::vector<std::string> &Args) {
char **Argv = (char**)CreateArgv(Args);
// Call the main function...
return PF(Args.size(), Argv);
int Result = PF(Args.size(), Argv);
// Run any atexit handlers now!
runAtExitHandlers();
return Result;
}

7
lib/ExecutionEngine/JIT/VM.h
View File

@ -27,6 +27,7 @@ class VM : public ExecutionEngine {
// handler to lazily patch up references...
//
std::map<void*, Function*> FunctionRefs;
public:
VM(Module *M, TargetMachine *tm);
~VM();
@ -54,6 +55,12 @@ public:
// which causes lazy compilation of the target function.
//
static void CompilationCallback();
/// runAtExitHandlers - Before exiting the program, at_exit functions must be
/// called. This method calls them.
///
static void runAtExitHandlers();
private:
static MachineCodeEmitter *createEmitter(VM &V);
void setupPassManager();