public void WriteToFileTest( )
{
string path = Path.GetTempFileName( );
try
{
using (var context = new Context( ))
using (var module = new BitcodeModule(context, TestModuleName))
{
Function testFunc = CreateSimpleVoidNopTestFunction(module, "foo");
module.WriteToFile(path);
}
using (var ctx = new Context( ))
using (var module2 = BitcodeModule.LoadFrom(path, ctx))
{
Function testFunc = module2.GetFunction("foo");
// verify basics
Assert.IsNotNull(testFunc);
string txt = module2.WriteToString( );
Assert.IsFalse(string.IsNullOrWhiteSpace(txt));
string expectedText = string.Format(TestModuleTemplate, Environment.NewLine, path);
Assert.AreEqual(expectedText, txt);
}
}
finally
{
File.Delete(path);
}
}
/// <summary>Creates a test LLVM module with debug information</summary>
/// <param name="args">ignored</param>
/// <remarks>
/// <code language="c" title="Example code generated" source="test.c" />
/// </remarks>
public static void Main(string[] args)
{
TargetDetails = new CortexM3Details();
string srcPath = args[0];
if (!File.Exists(srcPath))
{
Console.Error.WriteLine("Src file not found: '{0}'", srcPath);
return;
}
srcPath = Path.GetFullPath(srcPath);
string moduleName = $"test_{TargetDetails.ShortName}.bc";
using (StaticState.InitializeLLVM())
{
StaticState.RegisterAll( );
var target = Target.FromTriple(TargetDetails.Triple);
using (var context = new Context( ))
using (var targetMachine = target.CreateTargetMachine(TargetDetails.Triple, TargetDetails.Cpu, TargetDetails.Features, CodeGenOpt.Aggressive, Reloc.Default, CodeModel.Small))
using (var module = new BitcodeModule(context, moduleName))
{
module.SourceFileName = Path.GetFileName(srcPath);
TargetDependentAttributes = TargetDetails.BuildTargetDependentFunctionAttributes(context);
var targetData = targetMachine.TargetData;
module.TargetTriple = targetMachine.Triple;
module.Layout = targetMachine.TargetData;
// create compile unit and file as the top level scope for everything
var cu = module.DIBuilder.CreateCompileUnit(SourceLanguage.C99
, Path.GetFileName(srcPath)
, Path.GetDirectoryName(srcPath)
, VersionIdentString
, false
, string.Empty
, 0
);
var diFile = module.DIBuilder.CreateFile(srcPath);
// Create basic types used in this compilation
var i32 = new DebugBasicType(module.Context.Int32Type, module, "int", DiTypeKind.Signed);
var f32 = new DebugBasicType(module.Context.FloatType, module, "float", DiTypeKind.Float);
var voidType = DebugType.Create(module.Context.VoidType, ( DIType )null);
var i32Array_0_32 = i32.CreateArrayType(module, 0, 32);
// create the LLVM structure type and body with full debug information
#pragma warning disable SA1500 // "Warning SA1500 Braces for multi - line statements must not share line" (simple table format)
var fooBody = new[]
{ new DebugMemberInfo {
File = diFile, Line = 3, Name = "a", DebugType = i32, Index = 0
}
, new DebugMemberInfo {
File = diFile, Line = 4, Name = "b", DebugType = f32, Index = 1
}
, new DebugMemberInfo {
File = diFile, Line = 5, Name = "c", DebugType = i32Array_0_32, Index = 2
} };
#pragma warning restore
var fooType = new DebugStructType(module, "struct.foo", cu, "foo", diFile, 1, DebugInfoFlags.None, fooBody);
// add global variables and constants
var constArray = ConstantArray.From(i32, 32, module.Context.CreateConstant(3), module.Context.CreateConstant(4));
var barValue = module.Context.CreateNamedConstantStruct(fooType
, module.Context.CreateConstant(1)
, module.Context.CreateConstant(2.0f)
, constArray
);
var bar = module.AddGlobal(fooType, false, 0, barValue, "bar");
bar.Alignment = targetData.AbiAlignmentOf(fooType);
bar.AddDebugInfo(module.DIBuilder.CreateGlobalVariableExpression(cu, "bar", string.Empty, diFile, 8, fooType.DIType, false, null));
var baz = module.AddGlobal(fooType, false, Linkage.Common, Constant.NullValueFor(fooType), "baz");
baz.Alignment = targetData.AbiAlignmentOf(fooType);
baz.AddDebugInfo(module.DIBuilder.CreateGlobalVariableExpression(cu, "baz", string.Empty, diFile, 9, fooType.DIType, false, null));
// add module flags and compiler identifiers...
// this can technically occur at any point, though placing it here makes
// comparing against clang generated files easier
AddModuleFlags(module);
// create types for function args
var constFoo = module.DIBuilder.CreateQualifiedType(fooType.DIType, QualifiedTypeTag.Const);
var fooPtr = new DebugPointerType(fooType, module);
// Create the functions
// NOTE: The declaration ordering is reversed from that of the sample code file (test.c)
// However, this is what Clang ends up doing for some reason so it is
// replicated here to aid in comparing the generated LL files.
Function doCopyFunc = DeclareDoCopyFunc(module, diFile, voidType);
Function copyFunc = DeclareCopyFunc(module, diFile, voidType, constFoo, fooPtr);
CreateCopyFunctionBody(module, targetData, copyFunc, diFile, fooType, fooPtr, constFoo);
CreateDoCopyFunctionBody(module, targetData, doCopyFunc, fooType, bar, baz, copyFunc);
// finalize the debug information
// all temporaries must be replaced by now, this resolves any remaining
// forward declarations and marks the builder to prevent adding any
// nodes that are not completely resolved.
module.DIBuilder.Finish( );
// verify the module is still good and print any errors found
if (!module.Verify(out string msg))
{
Console.Error.WriteLine("ERROR: {0}", msg);
}
else
{
// test optimization works, but don't save it as that makes it harder to do a diff with official clang builds
{// force a GC to verify callback delegate for diagnostics is still valid, this is for test only and wouldn't
// normally be done in production code.
GC.Collect(GC.MaxGeneration);
var modForOpt = module.Clone( );
// NOTE:
// The ordering of passes can matter depending on the pass and passes may be added more than once
// the caller has full control of ordering, this is just a sample of effectively randomly picked
// passes and not necessarily a reflection of any particular use case.
var pm = new ModulePassManager( )
.AddAlwaysInlinerPass( )
.AddAggressiveDCEPass( )
.AddArgumentPromotionPass( )
.AddBasicAliasAnalysisPass( )
.AddBitTrackingDCEPass( )
.AddCFGSimplificationPass( )
.AddConstantMergePass( )
.AddConstantPropagationPass( )
.AddFunctionInliningPass( )
.AddGlobalOptimizerPass( )
.AddInstructionCombiningPass( );
pm.Run(modForOpt);
}
// Module is good, so generate the output files
module.WriteToFile("test.bc");
File.WriteAllText("test.ll", module.WriteToString( ));
targetMachine.EmitToFile(module, "test.o", CodeGenFileType.ObjectFile);
targetMachine.EmitToFile(module, "test.s", CodeGenFileType.AssemblySource);
}
}
}
}