private static BitcodeModule CreateModule(Context ctx, TargetMachine machine, int magicNumber, string modulename = "test", string functionname = "main")
{
var module = ctx.CreateBitcodeModule(modulename);
module.Layout = machine.TargetData;
IrFunction main = module.CreateFunction(functionname, ctx.GetFunctionType(ctx.Int32Type));
BasicBlock entryBlock = main.AppendBasicBlock("entry");
var bldr = new InstructionBuilder(entryBlock);
bldr.Return(ctx.CreateConstant(magicNumber));
return(module);
}
private static void CreateDoCopyFunctionBody(BitcodeModule module
, IrFunction doCopyFunc
, IStructType foo
, GlobalVariable bar
, GlobalVariable baz
, IrFunction copyFunc
)
{
var bytePtrType = module.Context.Int8Type.CreatePointerType( );
// create block for the function body, only need one for this simple sample
var blk = doCopyFunc.AppendBasicBlock("entry");
Debug.Assert(doCopyFunc.DISubProgram != null, "Expected non null subProgram");
// create instruction builder to build the body
var instBuilder = new InstructionBuilder(blk);
bool param0ByVal = copyFunc.Attributes[FunctionAttributeIndex.Parameter0].Contains(AttributeKind.ByVal);
if (!param0ByVal)
{
// create a temp local copy of the global structure
var dstAddr = instBuilder.Alloca(foo)
.RegisterName("agg.tmp")
.Alignment(module.Layout.CallFrameAlignmentOf(foo));
instBuilder.SetDebugLocation(25, 11, doCopyFunc.DISubProgram);
var bitCastDst = instBuilder.BitCast(dstAddr, bytePtrType);
var bitCastSrc = instBuilder.BitCast(bar, bytePtrType);
instBuilder.MemCpy(bitCastDst
, bitCastSrc
, module.Context.CreateConstant(module.Layout.ByteSizeOf(foo))
, false
);
instBuilder.SetDebugLocation(25, 5, doCopyFunc.DISubProgram)
.Call(copyFunc, dstAddr, baz);
}
else
{
instBuilder.SetDebugLocation(25, 5, doCopyFunc.DISubProgram)
.Call(copyFunc, bar, baz)
.AddAttributes(FunctionAttributeIndex.Parameter0, copyFunc.Parameters[0].Attributes);
}
instBuilder.SetDebugLocation(26, 1, doCopyFunc.DISubProgram)
.Return( );
}
private static void CreateCopyFunctionBody(BitcodeModule module
, IrFunction copyFunc
, DIFile diFile
, ITypeRef foo
, DebugPointerType fooPtr
, DIType constFooType
)
{
Debug.Assert(copyFunc.DISubProgram != null, "Expected function with a valid debug subprogram");
var diBuilder = module.DIBuilder;
copyFunc.Parameters[0].Name = "src";
copyFunc.Parameters[1].Name = "pDst";
// create block for the function body, only need one for this simple sample
var blk = copyFunc.AppendBasicBlock("entry");
// create instruction builder to build the body
var instBuilder = new InstructionBuilder(blk);
// create debug info locals for the arguments
// NOTE: Debug parameter indices are 1 based!
var paramSrc = diBuilder.CreateArgument(copyFunc.DISubProgram, "src", diFile, 11, constFooType, false, 0, 1);
var paramDst = diBuilder.CreateArgument(copyFunc.DISubProgram, "pDst", diFile, 12, fooPtr.DIType, false, 0, 2);
uint ptrAlign = module.Layout.CallFrameAlignmentOf(fooPtr);
// create Locals
// NOTE: There's no debug location attached to these instructions.
// The debug info will come from the declare intrinsic below.
var dstAddr = instBuilder.Alloca(fooPtr)
.RegisterName("pDst.addr")
.Alignment(ptrAlign);
bool param0ByVal = copyFunc.Attributes[FunctionAttributeIndex.Parameter0].Contains(AttributeKind.ByVal);
if (param0ByVal)
{
diBuilder.InsertDeclare(copyFunc.Parameters[0]
, paramSrc
, new DILocation(module.Context, 11, 43, copyFunc.DISubProgram)
, blk
);
}
instBuilder.Store(copyFunc.Parameters[1], dstAddr)
.Alignment(ptrAlign);
// insert declare pseudo instruction to attach debug info to the local declarations
diBuilder.InsertDeclare(dstAddr, paramDst, new DILocation(module.Context, 12, 38, copyFunc.DISubProgram), blk);
if (!param0ByVal)
{
// since the function's LLVM signature uses a pointer, which is copied locally
// inform the debugger to treat it as the value by dereferencing the pointer
diBuilder.InsertDeclare(copyFunc.Parameters[0]
, paramSrc
, diBuilder.CreateExpression(ExpressionOp.Deref)
, new DILocation(module.Context, 11, 43, copyFunc.DISubProgram)
, blk
);
}
var loadedDst = instBuilder.SetDebugLocation(15, 6, copyFunc.DISubProgram)
.Load(fooPtr, dstAddr)
.Alignment(ptrAlign);
instBuilder.SetDebugLocation(15, 13, copyFunc.DISubProgram);
var dstPtr = instBuilder.BitCast(loadedDst, module.Context.Int8Type.CreatePointerType( ));
var srcPtr = instBuilder.BitCast(copyFunc.Parameters[0], module.Context.Int8Type.CreatePointerType( ));
uint pointerSize = module.Layout.IntPtrType(module.Context).IntegerBitWidth;
instBuilder.MemCpy(dstPtr
, srcPtr
, module.Context.CreateConstant(pointerSize, module.Layout.ByteSizeOf(foo), false)
, false
);
instBuilder.SetDebugLocation(16, 1, copyFunc.DISubProgram)
.Return( );
}