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- added null check for self pointer before calling a native function

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With JIT enabled, an implicit test for null self pointer is added to generated code
This has no effect without JIT as VM verifies a pointer before calling a native method

https://forum.zdoom.org/viewtopic.php?t=64961
This commit is contained in:
alexey.lysiuk 2019-06-07 17:23:46 +03:00 committed by Rachael Alexanderson
parent c222b24c0a
commit d3e6ed3c9b
1 changed files with 22 additions and 0 deletions
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22
src/scripting/vm/jit_call.cpp
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@ -323,6 +323,28 @@ void JitCompiler::EmitNativeCall(VMNativeFunction *target)
I_Error("Native direct member function calls not implemented\n");
}
if (target->ImplicitArgs > 0)
{
auto label = EmitThrowExceptionLabel(X_READ_NIL);
assert(ParamOpcodes.Size() > 0);
const VMOP *param = ParamOpcodes[0];
const int bc = param->i16u;
asmjit::X86Gp *reg = nullptr;
switch (param->a & REGT_TYPE)
{
case REGT_STRING: reg = &regS[bc]; break;
case REGT_POINTER: reg = &regA[bc]; break;
default:
I_Error("Unexpected register type for self pointer\n");
break;
}
cc.test(*reg, *reg);
cc.jz(label);
}
asmjit::CBNode *cursorBefore = cc.getCursor();
auto call = cc.call(imm_ptr(target->DirectNativeCall), CreateFuncSignature());
call->setInlineComment(target->PrintableName.GetChars());