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jit_objects.cpp
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144 lines (131 loc) · 4.35 KB
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#include "jit/jit_objects.hpp"
#include "cpptrace/forward.hpp"
#include "utils/error.hpp"
#include "utils/optional.hpp"
#include "utils/span.hpp"
#include "binary/elf.hpp"
#include "binary/mach-o.hpp"
#include <algorithm>
#include <iostream>
#include <fstream>
#include <map>
#include <vector>
CPPTRACE_BEGIN_NAMESPACE
namespace detail {
#if IS_LINUX || IS_APPLE
class jit_object_manager {
struct object_entry {
const char* object_start;
std::unique_ptr<jit_object_type> object;
};
std::vector<object_entry> objects;
struct range_entry {
frame_ptr low;
frame_ptr high; // not inclusive
const char* object_start;
jit_object_type* object;
bool operator<(const range_entry& other) const {
return low < other.low;
}
};
// TODO: Maybe use a set...
std::vector<range_entry> range_list;
public:
void add_jit_object(cbspan object) {
auto object_res = jit_object_type::open(object);
if(object_res.is_error()) {
if(!should_absorb_trace_exceptions()) {
object_res.drop_error();
}
return;
}
objects.push_back({object.data(), make_unique<jit_object_type>(std::move(object_res).unwrap_value())});
auto* object_file = objects.back().object.get();
auto ranges_res = object_file->get_pc_ranges();
if(ranges_res.is_error()) {
if(!should_absorb_trace_exceptions()) {
ranges_res.drop_error();
}
return;
}
auto& ranges = ranges_res.unwrap_value();
for(auto range : ranges) {
range_entry entry{range.low, range.high, object.data(), object_file};
// TODO: Perf
range_list.insert(std::upper_bound(range_list.begin(), range_list.end(), entry), entry);
}
}
void remove_jit_object(const char* ptr) {
// TODO: Perf
objects.erase(
std::remove_if(
objects.begin(),
objects.end(),
[&](const object_entry& entry) { return entry.object_start == ptr; }
),
objects.end()
);
range_list.erase(
std::remove_if(
range_list.begin(),
range_list.end(),
[&](const range_entry& entry) { return entry.object_start == ptr; }
),
range_list.end()
);
}
optional<jit_object_lookup_result> lookup(frame_ptr pc) const {
auto it = first_less_than_or_equal(
range_list.begin(),
range_list.end(),
pc,
[](frame_ptr pc, const range_entry& entry) {
return pc < entry.low;
}
);
if(it == range_list.end()) {
return nullopt;
}
ASSERT(pc >= it->low);
if(pc < it->high) {
return jit_object_lookup_result{*it->object, it->low};
} else {
return nullopt;
}
}
void clear_all_jit_objects() {
objects.clear();
range_list.clear();
}
};
#else
class jit_object_manager {
public:
void add_jit_object(cbspan) {}
void remove_jit_object(const char*) {}
void clear_all_jit_objects() {}
};
#endif
jit_object_manager& get_jit_object_manager() {
static jit_object_manager manager;
return manager;
}
void register_jit_object(const char* ptr, std::size_t size) {
auto& manager = get_jit_object_manager();
manager.add_jit_object(make_span(ptr, size));
}
void unregister_jit_object(const char* ptr) {
auto& manager = get_jit_object_manager();
manager.remove_jit_object(ptr);
}
void clear_all_jit_objects() {
auto& manager = get_jit_object_manager();
manager.clear_all_jit_objects();
}
#if IS_LINUX || IS_APPLE
optional<jit_object_lookup_result> lookup_jit_object(frame_ptr pc) {
return get_jit_object_manager().lookup(pc);
}
#endif
}
CPPTRACE_END_NAMESPACE