From af72bfd7a78ecf2513cdb63918fc7695705642e3 Mon Sep 17 00:00:00 2001
From: Christian Dietrich <christian.dietrich@informatik.uni-erlangen.de>
Date: Mon, 24 Oct 2016 13:16:56 +0200
Subject: [PATCH] posix: port to LLVM 3.8/3.9
---
README.md | 57 ++++--------------------
arch/generic/CMakeLists.txt | 2 +
arch/generic/timing-arch.cc | 4 ++
arch/i386/dispatch.cc | 2 +-
arch/i386/idt.cc | 2 +-
arch/i386/lapic.cc | 2 +-
arch/i386/machine.cc | 7 +--
arch/i386/machine.h | 2 +-
arch/i386/memutil.cc | 6 +++
arch/i386/output.h | 1 -
arch/i386/reschedule-ast.cc | 2 +-
arch/i386/serial.cc | 4 +-
arch/i386/syscall.cc | 58 +++++++++++++------------
arch/patmos/timing-arch.cc | 2 +
generator/attributor/main.cc | 10 ++++-
generator/coder/syscall_full.py | 77 +++++++++++++++++++--------------
generator/extractor/main.cc | 33 +++++++++-----
os/timing.h | 3 +-
toolchain/detect | 3 +-
toolchain/llvm-link.py | 2 +-
20 files changed, 142 insertions(+), 137 deletions(-)
create mode 100644 arch/generic/timing-arch.cc
diff --git a/README.md b/README.md
index 8af0753..0381b1b 100644
--- a/README.md
+++ b/README.md
@@ -16,11 +16,7 @@ dependability as the first-class design goal targeting
safety-critical, embedded applications, the system provides an
OSEK/AUTOSAR-conform interface (currently ECC1).
-Currently, dOSEK supports three platforms:
-
-- x86: 32-Bit version of dOSEK that runs on bare metal
-- posix: 32-Bit version of dOSEK that runs on Linux/x86
-- arm: Port to the Panda Board/zedboard (currently WIP)
+**This repository contains the PATMOS version of dOSEK used for SysWCET**
For more information about the dOSEK concepts, see
https://www4.cs.fau.de/Research/dOSEK/
@@ -28,56 +24,19 @@ For more information about the dOSEK concepts, see
Software Requirements
---------------------
- apt-get install binutils-dev build-essential clang-3.4 cmake \
- g++-multilib gcc-multilib git grub-common grub-pc-bin \
- llvm-3.3-dev llvm-3.3-runtime python-minimal python3 \
- python3-lxml python3-pyparsing python3-pip \
- qemu-system-x86 xorriso
-
- LLVM_CONFIG_PATH=/usr/bin/llvm-config-3.3 pip3 install llvmpy
-
-For the ARM version, you will additionally need
-
- gcc-arm-none-eabi gdb-arm-none-eabi qemu-system-arm
+For
Building
--------
dOSEK uses cmake as a build system.
-We recommend to make an out-of-source build
-To build and run all test-cases you have to type:
-
- mkdir build; cd build
- <Path to dOSEK>/new_build_env.py
- make build_and_test
-
-To get help about the available targets use
+We recommend to make an out-of-source build:
- make help # long help
- make h # short help
-`after_first_checkout.sh` is only necessary, if you are going to
-contribute via our gerrit code review system.
-
-Docker Images
--------------
-
-[](https://registry.hub.docker.com/u/danceos/dosek-base/)
-
-
-We provide [docker.io](http://www.docker.com) images for a basic
-build environment. These images provide an SSH port and access to an
-Ubuntu machine that contains all build dependencies. You can either
-build the images yourself with
-
- cd scripts/docker; make
- make run
- make ssh
-
-or you can pull it directly from the docker Hub
+ mkdir build; cd build
+ ../new_build_env.py -a patmos --generate-pml=true
- docker pull danceos/dosek-base
- cd scripts/docker; make run; make ssh
+To evaluate the Worst-Case Response Time of the aborted computation
+benchmark, please run:
-In either cases, the password is `dosek`. In the default
-configuration, no SSH port will be exposed to the outside world.
+ make wcet-bench-timing-aborted_computation CIRCUIT=0 VERBOSE=2
diff --git a/arch/generic/CMakeLists.txt b/arch/generic/CMakeLists.txt
index d650105..fbc3551 100644
--- a/arch/generic/CMakeLists.txt
+++ b/arch/generic/CMakeLists.txt
@@ -1,5 +1,7 @@
set(SRCS
startup.cc
+ timing-arch.cc
+
)
# Add to include directories
diff --git a/arch/generic/timing-arch.cc b/arch/generic/timing-arch.cc
new file mode 100644
index 0000000..e7adca6
--- /dev/null
+++ b/arch/generic/timing-arch.cc
@@ -0,0 +1,4 @@
+extern "C" int __attribute__((weak)) arch_timing_get() {
+ static int time;
+ return ++time;
+}
diff --git a/arch/i386/dispatch.cc b/arch/i386/dispatch.cc
index ea13a78..1054bf0 100644
--- a/arch/i386/dispatch.cc
+++ b/arch/i386/dispatch.cc
@@ -30,7 +30,7 @@ volatile uint16_t dispatch_task;
* This interrupt is called after the next task is determined by the scheduler in ring 3
* and performs the actual dispatching in ring 0.
*/
-IRQ_HANDLER(IRQ_DISPATCH) {
+ISR(IRQ_DISPATCH) {
#ifdef CONFIG_DEPENDABILITY_ENCODED
// decode task ID
uint16_t id = dispatch_task.decode();
diff --git a/arch/i386/idt.cc b/arch/i386/idt.cc
index 7432678..9c86309 100644
--- a/arch/i386/idt.cc
+++ b/arch/i386/idt.cc
@@ -42,7 +42,7 @@ ISR(unhandled) {
// NMI error handler
-IRQ_HANDLER(2) {
+ISR(2) {
CALL_HOOK(FaultDetectedHook, TRAPdetected, 0, 0);
Machine::halt();
diff --git a/arch/i386/lapic.cc b/arch/i386/lapic.cc
index 44b8c7b..fc10a1e 100644
--- a/arch/i386/lapic.cc
+++ b/arch/i386/lapic.cc
@@ -30,7 +30,7 @@ void LAPIC::init() {
/** \brief Spurious interrupt handler */
-IRQ_HANDLER(255) {
+ISR(255) {
// count spurious interrupt
spurious_interrupts++;
diff --git a/arch/i386/machine.cc b/arch/i386/machine.cc
index 2ab245f..1f119f4 100644
--- a/arch/i386/machine.cc
+++ b/arch/i386/machine.cc
@@ -7,10 +7,8 @@ using namespace arch;
// new syscall to trigger interrupt using local APIC
// for now, any function can be called using syscall(),
// so it is easy to add this for this test.
-noinline void __OS_trigger_syscall() {
- uint8_t irq;
- asm volatile("" : "=a"(irq));
- Machine::trigger_interrupt(irq);
+noinline void __OS_trigger_syscall(uint32_t irq) {
+ Machine::trigger_interrupt((uint8_t) irq);
}
void Machine::trigger_interrupt_from_user(uint8_t irq) {
@@ -25,4 +23,3 @@ void Machine::trigger_interrupt_from_user(uint8_t irq) {
while (x < 100) x++;
}
#endif
-
diff --git a/arch/i386/machine.h b/arch/i386/machine.h
index 962c1a8..ab614da 100644
--- a/arch/i386/machine.h
+++ b/arch/i386/machine.h
@@ -293,6 +293,6 @@ struct Machine
#define __asm_label(a) #a
#define _asm_label(a) __asm_label(a)
-#define asm_label(label) asm volatile (".asm_label." label "_%=:" :: "m" (*(void *)0))
+#define asm_label(label) asm volatile (".L." label "_%=:" :: "m" (*(int *)0))
#endif // __MACHINE_H__
diff --git a/arch/i386/memutil.cc b/arch/i386/memutil.cc
index d1f15bf..a67769b 100644
--- a/arch/i386/memutil.cc
+++ b/arch/i386/memutil.cc
@@ -37,3 +37,9 @@ extern "C" void memset(void *dest, int pat, size_t size)
destination[i] = pattern;
}
}
+
+extern "C" int strlen(char *dst) {
+ int i = 0;
+ while (*dst) { i++; dst++; }
+ return i;
+}
diff --git a/arch/i386/output.h b/arch/i386/output.h
index 68379ab..f70df52 100644
--- a/arch/i386/output.h
+++ b/arch/i386/output.h
@@ -7,7 +7,6 @@
#define __OUTPUT_H__
#include "arch/generic/ostream.h"
-
#ifndef FAIL
#if DEBUG
diff --git a/arch/i386/reschedule-ast.cc b/arch/i386/reschedule-ast.cc
index a5a03e4..b6b5c14 100644
--- a/arch/i386/reschedule-ast.cc
+++ b/arch/i386/reschedule-ast.cc
@@ -22,7 +22,7 @@ static const uint32_t iret_schedule[] = {
};
#endif
-IRQ_HANDLER(IRQ_RESCHEDULE) {
+ISR(IRQ_RESCHEDULE) {
#ifndef CONFIG_ARCH_PRIVILEGE_ISOLATION
// If we have no privilege isolation, we have to switch to the os_stack
asm volatile ("mov %0, %%esp;" :: "i"(&(_estack_os) - 2048));
diff --git a/arch/i386/serial.cc b/arch/i386/serial.cc
index 09ab381..878f23b 100644
--- a/arch/i386/serial.cc
+++ b/arch/i386/serial.cc
@@ -18,10 +18,10 @@ Serial::Serial(ports port) : PORT((uint16_t) port) {
void Serial::putchar(char character) {
// wait while transmit not empty
- bool empty;
+ bool empty; int i = 10000;
do {
empty = (inb(PORT + 5) & 0x20);
- } while(!empty);
+ } while(!empty && --i > 0) ;
outb(PORT, character);
}
diff --git a/arch/i386/syscall.cc b/arch/i386/syscall.cc
index e1fe60c..0474dd2 100644
--- a/arch/i386/syscall.cc
+++ b/arch/i386/syscall.cc
@@ -15,7 +15,7 @@ namespace arch {
/* Syscalls that run in userspace, this are indirect syscall, they
are intended for longer syscalls */
-extern "C" __attribute__((naked)) void sysenter_syscall() {
+extern "C" /*__attribute__((naked)) */ void sysenter_syscall() {
// get arguments from registers
void *fun, *sp;
uint32_t arg1, arg2, arg3;
@@ -51,45 +51,49 @@ extern "C" __attribute__((naked)) void sysenter_syscall() {
}
-/** \brief Syscall interrupt handler. This handler is used for direct
- syscalls that do not run in userspace, but in kernelmode */
-IRQ_HANDLER(IRQ_SYSCALL) {
- // get arguments from registers
- // also, store pointer to context in %esi before we change %esp
- void* fun;
- uint32_t arg1, arg2, arg3;
- asm volatile("" : "=a"(arg1), "=b"(arg2), "=S"(arg3), "=d"(fun));
- // block ISR2s by raising APIC task priority
- LAPIC::set_task_prio(128);
+ extern "C" void irq_syscall_handler(void * fun, uint32_t arg1) {
+ // block ISR2s by raising APIC task priority
+ LAPIC::set_task_prio(128);
- // reenable ISR1s
- Machine::enable_interrupts();
+ // reenable ISR1s
+ Machine::enable_interrupts();
#ifdef CONFIG_ARCH_MPU
- // save page directory
- uint32_t pd;
- asm volatile("mov %%cr3, %0" : "=D"(pd));
+ // save page directory
+ uint32_t pd;
+ asm volatile("mov %%cr3, %0" : "=D"(pd));
- // change to OS page directory
- PageDirectory::enable(pagedir_os);
+ // change to OS page directory
+ PageDirectory::enable(pagedir_os);
#endif
- // call syscall function with arguments
- asm volatile("call *%0" :: "r"(fun), "a"(arg1), "b"(arg2), "S"(arg3));
+ // call syscall function with arguments
+ ((void (*)(uint32_t))fun)(arg1);
#ifdef CONFIG_ARCH_MPU
- // restore page directory
- asm volatile("mov %0, %%cr3" :: "D"(pd));
+ // restore page directory
+ PageDirectory::enable(pd);
#endif
- // reenable ISR2s by resetting APIC task priority
- Machine::disable_interrupts();
- LAPIC::set_task_prio(0);
+ // reenable ISR2s by resetting APIC task priority
+ Machine::disable_interrupts();
+ LAPIC::set_task_prio(0);
- // return from interrupt and proceed with caller in ring 3
- Machine::return_from_interrupt();
+}
+
+/** \brief Syscall interrupt handler. This handler is used for direct
+ syscalls that do not run in userspace, but in kernelmode */
+IRQ_HANDLER(IRQ_SYSCALL) {
+ asm volatile(
+ "push %eax;"
+ "push %edx;"
+ "call irq_syscall_handler;"
+ "pop %eax;"
+ "pop %edx;"
+ "iret;"
+ );
}
diff --git a/arch/patmos/timing-arch.cc b/arch/patmos/timing-arch.cc
index af3829b..a76a66a 100644
--- a/arch/patmos/timing-arch.cc
+++ b/arch/patmos/timing-arch.cc
@@ -3,6 +3,8 @@
#include "irq.h"
#include "machine.h"
+int __attribute__((weak)) timing_print() {};
+
void timing_dump_trap(const arch::IRQ::Context & x) {
(void) x;
diff --git a/generator/attributor/main.cc b/generator/attributor/main.cc
index c1f2bf1..809fc90 100644
--- a/generator/attributor/main.cc
+++ b/generator/attributor/main.cc
@@ -14,7 +14,7 @@
#include <llvm/Config/llvm-config.h>
-#if LLVM_VERSION_MAJOR >= 3 && LLVM_VERSION_MINOR >= 6
+#if LLVM_VERSION_MAJOR >= 3 && LLVM_VERSION_MINOR >= 9
#undef LLVM_LEGACY
#else
#define LLVM_LEGACY 1
@@ -110,10 +110,16 @@ static inline std::unique_ptr<Module> LoadFile(const char *argv0, const std::str
int main(int argc, char **argv) {
// Print a stack trace if we signal out.
+#ifdef LLVM_LEGACY
sys::PrintStackTraceOnErrorSignal();
+ LLVMContext &Context = getGlobalContext();
+#else
+ sys::PrintStackTraceOnErrorSignal(argv[0]);
+ LLVMContext Context;
+#endif
PrettyStackTraceProgram X(argc, argv);
- LLVMContext &Context = getGlobalContext();
+
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
cl::ParseCommandLineOptions(argc, argv, "llvm dosek attributor\n");
diff --git a/generator/coder/syscall_full.py b/generator/coder/syscall_full.py
index 40bde30..0c99a72 100644
--- a/generator/coder/syscall_full.py
+++ b/generator/coder/syscall_full.py
@@ -200,7 +200,9 @@ class FullSystemCalls(BaseCoder):
kernelspace.add(Statement("%s.do_tick()" % counter.impl.name))
for alarm in self.system_graph.alarms:
if alarm.conf.counter == counter:
- kernelspace.add(Statement("AlarmCheck%s()" % alarm.impl.name))
+ alarm.carried_syscall.function = abb.function
+ check_alarm = self.alarms(self).generate_check_alarm_softcounter(alarm)
+ kernelspace.add(Statement(check_alarm))
kernelspace.add(Comment("Dispatch directly back to Userland"))
self.call(kernelspace, "Dispatcher::ResumeToTask",
@@ -382,15 +384,53 @@ class AlarmTemplate(CodeTemplate):
return ret
- def __generate_softcounter_event(self, alarm):
+ def generate_check_alarm_softcounter(self, alarm):
+ args = {"alarm": alarm.impl.name}
abb = alarm.carried_syscall
+ ret = self.expand_snippet("if_alarm", **args) + "\n"
userspace, kernelspace = Block(), Block()
+
if abb.isA(S.ActivateTask):
self.rules.syscall_rules.ActivateTask(abb, userspace, kernelspace)
else:
self.rules.syscall_rules.SetEvent(abb, userspace, kernelspace)
- return "".join(kernelspace.expand(None))
+ ret += "".join(kernelspace.expand(None))
+ ret += self.expand_snippet("endif_alarm", **args) + "\n"
+
+ return ret
+
+ def generate_check_alarm(self, alarm):
+ callback_name = "OSEKOS_ALARMCB_%s" % (alarm.name)
+ has_callback = (self.system_graph.find(GraphFunction, callback_name) != None)
+ args = {"alarm": alarm.impl.name}
+ # Add a label to identify this basic block
+ ret = ""
+ ret += " abb_%(label)s: (void) &&abb_%(label)s;\n" %{
+ "label": alarm.carried_checkalarm.generated_function_name()
+ }
+ ret += self.expand_snippet("if_alarm", **args) + "\n"
+ # This alarm has an callback
+ if has_callback:
+ # Add a Declaration
+ decl = FunctionDeclaration(callback_name, extern_c = True)
+ self.generator.source_file.function_manager.add(decl)
+ ret += self.expand_snippet("alarm_alarmcallback", callback = callback_name) + "\n"
+
+ carried = alarm.carried_syscall
+ # SetEvent needs two arguments
+ if alarm.conf.event:
+ arglist = "(0, 0)"
+ else:
+ arglist = "(0)"
+ # Add a label to identify this basic block
+ ret += " abb_%(label)s: (void) &&abb_%(label)s;\n" %{
+ "label": carried.generated_function_name()
+ }
+ ret += " " + carried.generated_function_name() + arglist + ";\n"
+ ret += self.expand_snippet("endif_alarm", **args) + "\n"
+
+ return ret
def generate_check_alarms(self, snippet, args):
if not self.system_graph.AlarmHandlerSubtask:
@@ -402,36 +442,9 @@ class AlarmTemplate(CodeTemplate):
ret += [" " + kickoff.generated_function_name() + "();\n"]
for alarm in self.system_graph.alarms:
- callback_name = "OSEKOS_ALARMCB_%s" % (alarm.name)
- has_callback = (self.system_graph.find(GraphFunction, callback_name) != None)
- args = {"alarm": alarm.impl.name}
- # Add a label to identify this basic block
- ret += " abb_%(label)s: (void) &&abb_%(label)s;\n" %{
- "label": alarm.carried_checkalarm.generated_function_name()
- }
- ret += self.expand_snippet("if_alarm", **args) + "\n"
- # This alarm has an callback
- if has_callback:
- # Add a Declaration
- decl = FunctionDeclaration(callback_name, extern_c = True)
- self.generator.source_file.function_manager.add(decl)
- ret += self.expand_snippet("alarm_alarmcallback", callback = callback_name) + "\n"
-
if alarm.conf.counter.conf.softcounter:
- ret += self.__generate_softcounter_event(alarm)
- else:
- carried = alarm.carried_syscall
- # SetEvent needs two arguments
- if alarm.conf.event:
- arglist = "(0, 0)"
- else:
- arglist = "(0)"
- # Add a label to identify this basic block
- ret += " abb_%(label)s: (void) &&abb_%(label)s;\n" %{
- "label": alarm.carried_syscall.generated_function_name()
- }
- ret += " " + carried.generated_function_name() + arglist + ";\n"
- ret += self.expand_snippet("endif_alarm", **args) + "\n"
+ continue
+ ret += [self.generate_check_alarm(alarm)]
ret += [" " + iret.generated_function_name() + "();\n"]
diff --git a/generator/extractor/main.cc b/generator/extractor/main.cc
index 09a56ea..b321350 100644
--- a/generator/extractor/main.cc
+++ b/generator/extractor/main.cc
@@ -30,6 +30,7 @@
#include <llvm/Linker/Linker.h>
#include <llvm/IR/Verifier.h>
#include <llvm/IR/CFG.h>
+#include <llvm/IR/DebugInfoMetadata.h>
#endif
@@ -150,16 +151,17 @@ static inline void SplitBasicBlocks(Module &module) {
}
}
-static inline void AddKickoffFunctionCalls(Module & module) {
+static inline void AddKickoffFunctionCalls(Module & module, LLVMContext &Context) {
std::vector<Type *> args;
- FunctionType *kickoff_type = FunctionType::get(Type::getVoidTy(getGlobalContext()), args, false);
+ FunctionType *kickoff_type = FunctionType::get(Type::getVoidTy(Context), args, false);
unsigned task_count = 0;
for (auto &function : module) {
+
BasicBlock &bb = *function.begin();
- IRBuilder<> Builder(getGlobalContext());
+ IRBuilder<> Builder(Context);
if (function.getName().startswith("OSEKOS_TASK_FUNC")) {
- Instruction *inst = &*bb.begin();
- Builder.SetInsertPoint(inst);
+ Instruction *inst = &*bb.begin();
+ Builder.SetInsertPoint(inst);
std::stringstream ss;
ss << "OSEKOS_kickoff_" << task_count++;
@@ -167,7 +169,11 @@ static inline void AddKickoffFunctionCalls(Module & module) {
Function::ExternalLinkage,
ss.str(), &module);
std::vector<Value*> ArgsV;
- Builder.CreateCall(F, ArgsV);
+ CallInst *CS = Builder.CreateCall(F, ArgsV);
+#ifndef LLVM_LEGACY
+ CS->setDebugLoc(DebugLoc::get(function.getSubprogram()->getLine(),
+ 0, function.getSubprogram()));
+#endif
// Split after Call
BasicBlock::iterator it = bb.begin();
@@ -306,19 +312,24 @@ static inline void DumpModuleStructure(Module &module) {
out << "}\n";
}
-static inline void TransformModule(Module &module) {
+static inline void TransformModule(Module &module, LLVMContext &Context) {
SplitBasicBlocks(module);
- AddKickoffFunctionCalls(module);
+ AddKickoffFunctionCalls(module, Context);
RenameSystemcalls(module);
DumpModuleStructure(module);
}
int main(int argc, char **argv) {
// Print a stack trace if we signal out.
+#ifdef LLVM_LEGACY
sys::PrintStackTraceOnErrorSignal();
+ LLVMContext &Context = getGlobalContext();
+#else
+ sys::PrintStackTraceOnErrorSignal(argv[0]);
+ LLVMContext Context;
+#endif
PrettyStackTraceProgram X(argc, argv);
- LLVMContext &Context = getGlobalContext();
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
cl::ParseCommandLineOptions(argc, argv, "llvm dosek extractor\n");
@@ -365,7 +376,7 @@ int main(int argc, char **argv) {
//---- SNIP ----
// Here, we add our custom extractor
- TransformModule(*Composite);
+ TransformModule(*Composite, Context);
//--------------
if (DumpAsm) errs() << "Here's the assembly:\n" << *Composite;
@@ -376,7 +387,7 @@ int main(int argc, char **argv) {
#else
std::error_code ECC;
tool_output_file Out(OutputFilename, ECC, sys::fs::F_None);
- std::string EC = ECC.message();
+ std::string EC = (! ECC) ? "" : ECC.message();
#endif
if (EC != "") {
errs() << EC << '\n';
diff --git a/os/timing.h b/os/timing.h
index 9b8a5f9..8d16488 100644
--- a/os/timing.h
+++ b/os/timing.h
@@ -14,8 +14,9 @@ extern "C" {
#else
#define timing_start(a) 0
#define timing_end(a) 0
-#define timing_dump() do {} while (0);
+#define timing_dump() do { Machine::shutdown(); } while(0)
#define timing_loop_bound(low, high)
+#define timing_print()
#endif
#define TIMING_POINT_NO_INTERRUPTS_IN_BLOCK 0x200
diff --git a/toolchain/detect b/toolchain/detect
index 57e987b..06843cf 100755
--- a/toolchain/detect
+++ b/toolchain/detect
@@ -139,7 +139,8 @@ def arch_patmos(toolchain):
toolchain['target']['platin'] = must(find_program("platin"), "Platin WCET Analyzer")
if __name__ == "__main__":
- arches = {"i386": [(llvm_config, {"hint": "/proj/i4danceos/tools/llvm-3.4/bin"}),
+ arches = {"i386": [(llvm_config, {"hint": "/proj/i4danceos/tools/llvm-3.4/bin",
+ "recommended": "3.9"}),
arch_i386],
"ARM": [(llvm_config, {"hint": "/proj/i4danceos/tools/llvm-3.4/bin"}),
arch_ARM_A9],
diff --git a/toolchain/llvm-link.py b/toolchain/llvm-link.py
index 6dca244..22986df 100755
--- a/toolchain/llvm-link.py
+++ b/toolchain/llvm-link.py
@@ -64,7 +64,7 @@ def llvm_link(files, output):
return output
def llvm_opt(input, output):
- check_output([toolchain['target']['opt'], "-std-compile-opts", "-always-inline", "-o", output, input])
+ check_output([toolchain['target']['opt'], "-always-inline", "-o", output, input])
return output
def llvm_opt_careful(input, output):
--
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