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LLVM: generate trampolines for "null" functions

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Embed name into the trampoline for easier debugging.
Only warn about it during the compilation phase.
This commit is contained in:
Nekotekina 2021-01-15 20:54:00 +03:00
parent aaaeb66cc8
commit 3567c43fb5
1 changed files with 58 additions and 7 deletions
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65
Utilities/JIT.cpp
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@ -305,6 +305,49 @@ const bool jit_initialize = []() -> bool
return true;
}();
[[noreturn]] static void null(const char* name)
{
fmt::throw_exception("Null function: %s", name);
}
static shared_mutex null_mtx;
static std::unordered_map<std::string, u64> null_funcs;
static u64 make_null_function(const std::string& name)
{
std::lock_guard lock(null_mtx);
if (u64& func_ptr = null_funcs[name]) [[likely]]
{
// Already exists
return func_ptr;
}
else
{
using namespace asmjit;
// Build a "null" function that contains its name
const auto func = build_function_asm<void (*)()>([&](X86Assembler& c, auto& args)
{
Label data = c.newLabel();
c.lea(args[0], x86::qword_ptr(data, 0));
c.jmp(imm_ptr(&null));
c.align(kAlignCode, 16);
c.bind(data);
// Copy function name bytes
for (char ch : name)
c.db(ch);
c.db(0);
c.align(kAlignData, 16);
});
func_ptr = reinterpret_cast<u64>(func);
return func_ptr;
}
}
// Simple memory manager
struct MemoryManager1 : llvm::RTDyldMemoryManager
{
@ -327,19 +370,14 @@ struct MemoryManager1 : llvm::RTDyldMemoryManager
utils::memory_release(ptr, c_max_size * 2);
}
[[noreturn]] static void null()
{
fmt::throw_exception("Null function");
}
llvm::JITSymbol findSymbol(const std::string& name) override
{
u64 addr = RTDyldMemoryManager::getSymbolAddress(name);
if (!addr)
{
jit_log.fatal("Function '%s' linked but not found.", name);
addr = reinterpret_cast<uptr>(&null);
jit_log.error("Function '%s' linked but not found.", name);
addr = make_null_function(name);
}
return {addr, llvm::JITSymbolFlags::Exported};
@ -409,6 +447,19 @@ struct MemoryManager2 : llvm::RTDyldMemoryManager
{
}
llvm::JITSymbol findSymbol(const std::string& name) override
{
u64 addr = RTDyldMemoryManager::getSymbolAddress(name);
if (!addr)
{
jit_log.error("Function '%s' linked but not found.", name);
addr = make_null_function(name);
}
return {addr, llvm::JITSymbolFlags::Exported};
}
u8* allocateCodeSection(uptr size, uint align, uint sec_id, llvm::StringRef sec_name) override
{
return jit_runtime::alloc(size, align, true);