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#!/bin/bash
if [ $# -lt 1 ]; then
echo "Path to clang++ required!"
echo "Usage: update_vtable_value_prof_inputs.sh /path/to/updated/clang++"
exit 1
else
CLANG=$1
fi
# Remember current directory.
CURDIR=$PWD
# Allows the script to be invoked from other directories.
OUTDIR=$(dirname $(realpath -s $0))
echo $OUTDIR
cd $OUTDIR
# vtable_prof.cc has the following class hierarchy:
# class Base
# ├── class Derived1
# └── class Derived2
# Derived1 is a class in the global namespace and Derived2 is in anonymous
# namespace for test coverage. Overridden virtual methods are annotated as
# `noinline` so the callsite remains indirect calls for testing purposes.
cat > vtable_prof.cc << EOF
#include <cstdlib>
#include <cstdio>
class Base {
public:
virtual int func1(int a, int b) = 0;
virtual int func2(int a, int b) = 0;
};
class Derived1 : public Base {
public:
__attribute__((noinline))
int func1(int a, int b) override
{
return a + b;
}
__attribute__((noinline))
int func2(int a, int b) override {
return a * b;
}
};
namespace {
class Derived2 : public Base {
public:
__attribute__((noinline))
int func1(int a, int b) override {
return a - b;
}
__attribute__((noinline))
int func2(int a, int b) override {
return a * (a - b);
}
};
} // namespace
__attribute__((noinline)) Base* createType(int a) {
Base* base = nullptr;
if (a % 4 == 0)
base = new Derived1();
else
base = new Derived2();
return base;
}
int main(int argc, char** argv) {
int sum = 0;
for (int i = 0; i < 1000; i++) {
int a = rand();
int b = rand();
Base* ptr = createType(i);
sum += ptr->func1(a, b) + ptr->func2(b, a);
}
printf("sum is %d\n", sum);
return 0;
}
EOF
# Clean up temporary files on exit and return to original directory.
cleanup() {
rm -f vtable_prof
rm -f vtable_prof.cc
cd $CURDIR
}
trap cleanup EXIT
FLAGS="-fuse-ld=lld -O2 -g -fprofile-generate=. -mllvm -enable-vtable-value-profiling"
${CLANG} ${FLAGS} vtable_prof.cc -o vtable_prof
env LLVM_PROFILE_FILE=vtable-value-prof-basic.profraw ./vtable_prof
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