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PPU LLVM: improve analyser

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Compile possibly executable holes between detected functions.
Add unused "PPU LLVM Greedy Mode" option (for future updates).
Add "nounwind" attribute to compiled functions (reduces size).
This commit is contained in:
Nekotekina 2021-01-19 20:40:15 +03:00
parent e71c2df39d
commit f9ee8978ff
6 changed files with 256 additions and 68 deletions
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32
Utilities/JIT.cpp
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@ -7,6 +7,7 @@
#include "mutex.h"
#include "util/vm.hpp"
#include "util/asm.hpp"
#include <charconv>
#include <immintrin.h>
#include <zlib.h>
@ -310,12 +311,29 @@ const bool jit_initialize = []() -> bool
fmt::throw_exception("Null function: %s", name);
}
namespace vm
{
extern u8* const g_sudo_addr;
}
static shared_mutex null_mtx;
static std::unordered_map<std::string, u64> null_funcs;
static u64 make_null_function(const std::string& name)
{
if (name.starts_with("__0x"))
{
u32 addr = -1;
auto res = std::from_chars(name.c_str() + 4, name.c_str() + name.size(), addr, 16);
if (res.ec == std::errc() && res.ptr == name.c_str() + name.size() && addr < 0x8000'0000)
{
// Point the garbage to reserved, non-executable memory
return reinterpret_cast<u64>(vm::g_sudo_addr + addr);
}
}
std::lock_guard lock(null_mtx);
if (u64& func_ptr = null_funcs[name]) [[likely]]
@ -376,8 +394,12 @@ struct MemoryManager1 : llvm::RTDyldMemoryManager
if (!addr)
{
jit_log.error("Function '%s' linked but not found.", name);
addr = make_null_function(name);
if (!addr)
{
fmt::throw_exception("Failed to link '%s'", name);
}
}
return {addr, llvm::JITSymbolFlags::Exported};
@ -453,8 +475,12 @@ struct MemoryManager2 : llvm::RTDyldMemoryManager
if (!addr)
{
jit_log.error("Function '%s' linked but not found.", name);
addr = make_null_function(name);
if (!addr)
{
fmt::throw_exception("Failed to link '%s' (MM2)", name);
}
}
return {addr, llvm::JITSymbolFlags::Exported};
@ -730,7 +756,7 @@ jit_compiler::jit_compiler(const std::unordered_map<std::string, u64>& _link, co
for (auto&& [name, addr] : _link)
{
m_engine->addGlobalMapping(name, addr);
m_engine->updateGlobalMapping(name, addr);
}
}