private void EmitNativeMain(LLVMContextRef context)
{
LLVMValueRef shadowStackTop = Module.GetNamedGlobal("t_pShadowStackTop");
LLVMBuilderRef builder = context.CreateBuilder();
var mainSignature = LLVMTypeRef.CreateFunction(LLVMTypeRef.Int32, new LLVMTypeRef[] { LLVMTypeRef.Int32, LLVMTypeRef.CreatePointer(LLVMTypeRef.Int8, 0) }, false);
var mainFunc = Module.AddFunction("__managed__Main", mainSignature);
var mainEntryBlock = mainFunc.AppendBasicBlock("entry");
builder.PositionAtEnd(mainEntryBlock);
LLVMValueRef managedMain = Module.GetNamedFunction("StartupCodeMain");
if (managedMain.Handle == IntPtr.Zero)
{
throw new Exception("Main not found");
}
LLVMTypeRef reversePInvokeFrameType = LLVMTypeRef.CreateStruct(new LLVMTypeRef[] { LLVMTypeRef.CreatePointer(LLVMTypeRef.Int8, 0), LLVMTypeRef.CreatePointer(LLVMTypeRef.Int8, 0) }, false);
LLVMValueRef reversePinvokeFrame = builder.BuildAlloca(reversePInvokeFrameType, "ReversePInvokeFrame");
LLVMValueRef RhpReversePInvoke2 = Module.GetNamedFunction("RhpReversePInvoke2");
if (RhpReversePInvoke2.Handle == IntPtr.Zero)
{
RhpReversePInvoke2 = Module.AddFunction("RhpReversePInvoke2", LLVMTypeRef.CreateFunction(LLVMTypeRef.Void, new LLVMTypeRef[] { LLVMTypeRef.CreatePointer(reversePInvokeFrameType, 0) }, false));
}
builder.BuildCall(RhpReversePInvoke2, new LLVMValueRef[] { reversePinvokeFrame }, "");
var shadowStack = builder.BuildMalloc(LLVMTypeRef.CreateArray(LLVMTypeRef.Int8, 1000000), String.Empty);
var castShadowStack = builder.BuildPointerCast(shadowStack, LLVMTypeRef.CreatePointer(LLVMTypeRef.Int8, 0), String.Empty);
builder.BuildStore(castShadowStack, shadowStackTop);
var shadowStackBottom = Module.AddGlobal(LLVMTypeRef.CreatePointer(LLVMTypeRef.Int8, 0), "t_pShadowStackBottom");
shadowStackBottom.Linkage = LLVMLinkage.LLVMExternalLinkage;
shadowStackBottom.Initializer = LLVMValueRef.CreateConstPointerNull(LLVMTypeRef.CreatePointer(LLVMTypeRef.Int8, 0));
shadowStackBottom.ThreadLocalMode = LLVMThreadLocalMode.LLVMLocalDynamicTLSModel;
builder.BuildStore(castShadowStack, shadowStackBottom);
// Pass on main arguments
LLVMValueRef argc = mainFunc.GetParam(0);
LLVMValueRef argv = mainFunc.GetParam(1);
LLVMValueRef mainReturn = builder.BuildCall(managedMain, new LLVMValueRef[]
{
castShadowStack,
argc,
argv,
},
"returnValue");
builder.BuildRet(mainReturn);
mainFunc.Linkage = LLVMLinkage.LLVMExternalLinkage;
}
