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Thread: drop is_leaf_function after 5e3bacbd9b

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Jan Beich 2019-09-10 07:28:11 +00:00 committed by Ivan
parent 412c620b9d
commit 53e7f6c5a5
1 changed files with 0 additions and 56 deletions
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56
Utilities/Thread.cpp
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@ -1468,62 +1468,6 @@ bool handle_access_violation(u32 addr, bool is_writing, x64_context* context)
return true;
}
#ifdef __linux__
extern "C" struct dwarf_eh_bases
{
void* tbase;
void* dbase;
void* func;
};
extern "C" struct fde* _Unwind_Find_FDE(void* pc, struct dwarf_eh_bases* bases);
#endif
// Detect leaf function
static bool is_leaf_function(u64 rip)
{
#ifdef _WIN32
DWORD64 base = 0;
if (const auto rtf = RtlLookupFunctionEntry(rip, &base, nullptr))
{
// Access UNWIND_INFO structure
const auto uw = (u8*)(base + rtf->UnwindData);
// Leaf function has zero epilog size and no unwind codes
return uw[0] == 1 && uw[1] == 0 && uw[2] == 0 && uw[3] == 0;
}
// No unwind info implies leaf function
return true;
#elif __linux__
struct dwarf_eh_bases bases;
if (struct fde* f = _Unwind_Find_FDE(reinterpret_cast<void*>(rip), &bases))
{
const auto words = (const u32*)f;
if (words[0] < 0x14)
{
return true;
}
if (words[0] == 0x14 && !words[3] && !words[4])
{
return true;
}
// TODO
return false;
}
// No unwind info implies leaf function
return true;
#else
// Unsupported
return false;
#endif
}
#ifdef _WIN32
static LONG exception_handler(PEXCEPTION_POINTERS pExp)