private static void CreateDoCopyFunctionBody(BitcodeModule module
, DataLayout layout
, Function doCopyFunc
, IStructType foo
, GlobalVariable bar
, GlobalVariable baz
, Function 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");
// 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(layout.CallFrameAlignmentOf(foo));
var bitCastDst = instBuilder.BitCast(dstAddr, bytePtrType)
.SetDebugLocation(25, 11, doCopyFunc.DISubProgram);
var bitCastSrc = instBuilder.BitCast(bar, bytePtrType)
.SetDebugLocation(25, 11, doCopyFunc.DISubProgram);
instBuilder.MemCpy(module
, bitCastDst
, bitCastSrc
, module.Context.CreateConstant(layout.ByteSizeOf(foo))
, ( int )layout.CallFrameAlignmentOf(foo)
, false
).SetDebugLocation(25, 11, doCopyFunc.DISubProgram);
instBuilder.Call(copyFunc, dstAddr, baz)
.SetDebugLocation(25, 5, doCopyFunc.DISubProgram);
}
else
{
instBuilder.Call(copyFunc, bar, baz)
.SetDebugLocation(25, 5, doCopyFunc.DISubProgram)
.AddAttributes(FunctionAttributeIndex.Parameter0, copyFunc.Parameters[0].Attributes);
}
instBuilder.Return( )
.SetDebugLocation(26, 1, doCopyFunc.DISubProgram);
}
private static void CreateCopyFunctionBody(BitcodeModule module
, DataLayout layout
, Function copyFunc
, DIFile diFile
, ITypeRef foo
, DebugPointerType fooPtr
, DIType constFooType
)
{
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 = 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.Load(dstAddr)
.Alignment(ptrAlign)
.SetDebugLocation(15, 6, copyFunc.DISubProgram);
var dstPtr = instBuilder.BitCast(loadedDst, module.Context.Int8Type.CreatePointerType( ))
.SetDebugLocation(15, 13, copyFunc.DISubProgram);
var srcPtr = instBuilder.BitCast(copyFunc.Parameters[0], module.Context.Int8Type.CreatePointerType( ))
.SetDebugLocation(15, 13, copyFunc.DISubProgram);
uint pointerSize = layout.IntPtrType(module.Context).IntegerBitWidth;
instBuilder.MemCpy(module
, dstPtr
, srcPtr
, module.Context.CreateConstant(pointerSize, layout.ByteSizeOf(foo), false)
, ( int )layout.AbiAlignmentOf(foo)
, false
).SetDebugLocation(15, 13, copyFunc.DISubProgram);
instBuilder.Return( )
.SetDebugLocation(16, 1, copyFunc.DISubProgram);
}
