//
// codegen.cs: The code generator
//
-// Author:
+// Authors:
// Miguel de Icaza (miguel@ximian.com)
+// Marek Safar (marek.safar@gmail.com)
//
// Copyright 2001, 2002, 2003 Ximian, Inc.
// Copyright 2004 Novell, Inc.
//
-//
-// Please leave this defined on SVN: The idea is that when we ship the
-// compiler to end users, if the compiler crashes, they have a chance
-// to narrow down the problem.
-//
-// Only remove it if you need to debug locally on your tree.
-//
-//#define PRODUCTION
-
using System;
-using System.IO;
-using System.Collections;
-using System.Collections.Specialized;
-using System.Globalization;
-using System.Reflection;
-using System.Reflection.Emit;
-using System.Runtime.InteropServices;
-using System.Security;
-using System.Security.Cryptography;
-using System.Security.Permissions;
-
-using Mono.Security.Cryptography;
-
-namespace Mono.CSharp {
-
- /// <summary>
- /// Code generator class.
- /// </summary>
- public class CodeGen {
- static AppDomain current_domain;
-
- public static AssemblyClass Assembly;
-
- static CodeGen ()
- {
- Reset ();
- }
-
- public static void Reset ()
- {
- Assembly = new AssemblyClass ();
- }
-
- public static string Basename (string name)
- {
- int pos = name.LastIndexOf ('/');
-
- if (pos != -1)
- return name.Substring (pos + 1);
-
- pos = name.LastIndexOf ('\\');
- if (pos != -1)
- return name.Substring (pos + 1);
-
- return name;
- }
+using System.Collections.Generic;
- public static string Dirname (string name)
- {
- int pos = name.LastIndexOf ('/');
-
- if (pos != -1)
- return name.Substring (0, pos);
-
- pos = name.LastIndexOf ('\\');
- if (pos != -1)
- return name.Substring (0, pos);
-
- return ".";
- }
-
- static public string FileName;
-
-#if MS_COMPATIBLE
- const AssemblyBuilderAccess COMPILER_ACCESS = 0;
+#if STATIC
+using MetaType = IKVM.Reflection.Type;
+using IKVM.Reflection;
+using IKVM.Reflection.Emit;
#else
- /* Keep this in sync with System.Reflection.Emit.AssemblyBuilder */
- const AssemblyBuilderAccess COMPILER_ACCESS = (AssemblyBuilderAccess) 0x800;
-#endif
-
- //
- // Initializes the code generator variables for interactive use (repl)
- //
- static public void InitDynamic (string name)
- {
- current_domain = AppDomain.CurrentDomain;
- AssemblyName an = Assembly.GetAssemblyName (name, name);
-
- Assembly.Builder = current_domain.DefineDynamicAssembly (an, AssemblyBuilderAccess.Run | COMPILER_ACCESS);
- RootContext.ToplevelTypes = new ModuleContainer (true);
- RootContext.ToplevelTypes.Builder = Assembly.Builder.DefineDynamicModule (Basename (name), false);
- Assembly.Name = Assembly.Builder.GetName ();
- }
-
- //
- // Initializes the code generator variables
- //
- static public bool Init (string name, string output, bool want_debugging_support)
- {
- FileName = output;
- AssemblyName an = Assembly.GetAssemblyName (name, output);
- if (an == null)
- return false;
-
- if (an.KeyPair != null) {
- // If we are going to strong name our assembly make
- // sure all its refs are strong named
- foreach (Assembly a in GlobalRootNamespace.Instance.Assemblies) {
- AssemblyName ref_name = a.GetName ();
- byte [] b = ref_name.GetPublicKeyToken ();
- if (b == null || b.Length == 0) {
- Report.Error (1577, "Assembly generation failed " +
- "-- Referenced assembly '" +
- ref_name.Name +
- "' does not have a strong name.");
- //Environment.Exit (1);
- }
- }
- }
-
- current_domain = AppDomain.CurrentDomain;
-
- try {
- Assembly.Builder = current_domain.DefineDynamicAssembly (an,
- AssemblyBuilderAccess.RunAndSave | COMPILER_ACCESS, Dirname (name));
- }
- catch (ArgumentException) {
- // specified key may not be exportable outside it's container
- if (RootContext.StrongNameKeyContainer != null) {
- Report.Error (1548, "Could not access the key inside the container `" +
- RootContext.StrongNameKeyContainer + "'.");
- Environment.Exit (1);
- }
- throw;
- }
- catch (CryptographicException) {
- if ((RootContext.StrongNameKeyContainer != null) || (RootContext.StrongNameKeyFile != null)) {
- Report.Error (1548, "Could not use the specified key to strongname the assembly.");
- Environment.Exit (1);
- }
- return false;
- }
-
- // Get the complete AssemblyName from the builder
- // (We need to get the public key and token)
- Assembly.Name = Assembly.Builder.GetName ();
-
- //
- // Pass a path-less name to DefineDynamicModule. Wonder how
- // this copes with output in different directories then.
- // FIXME: figure out how this copes with --output /tmp/blah
- //
- // If the third argument is true, the ModuleBuilder will dynamically
- // load the default symbol writer.
- //
- try {
- RootContext.ToplevelTypes.Builder = Assembly.Builder.DefineDynamicModule (
- Basename (name), Basename (output), want_debugging_support);
-
-#if !MS_COMPATIBLE
- // TODO: We should use SymbolWriter from DefineDynamicModule
- if (want_debugging_support && !SymbolWriter.Initialize (RootContext.ToplevelTypes.Builder, output)) {
- Report.Error (40, "Unexpected debug information initialization error `{0}'",
- "Could not find the symbol writer assembly (Mono.CompilerServices.SymbolWriter.dll)");
- return false;
- }
-#endif
- } catch (ExecutionEngineException e) {
- Report.Error (40, "Unexpected debug information initialization error `{0}'",
- e.Message);
- return false;
- }
-
- return true;
- }
-
- static public void Save (string name, bool saveDebugInfo)
- {
-#if GMCS_SOURCE
- PortableExecutableKinds pekind;
- ImageFileMachine machine;
-
- switch (RootContext.Platform) {
- case Platform.X86:
- pekind = PortableExecutableKinds.Required32Bit;
- machine = ImageFileMachine.I386;
- break;
- case Platform.X64:
- pekind = PortableExecutableKinds.PE32Plus;
- machine = ImageFileMachine.AMD64;
- break;
- case Platform.IA64:
- pekind = PortableExecutableKinds.PE32Plus;
- machine = ImageFileMachine.IA64;
- break;
- case Platform.AnyCPU:
- default:
- pekind = PortableExecutableKinds.ILOnly;
- machine = ImageFileMachine.I386;
- break;
- }
-#endif
- try {
-#if GMCS_SOURCE
- Assembly.Builder.Save (Basename (name), pekind, machine);
-#else
- Assembly.Builder.Save (Basename (name));
+using MetaType = System.Type;
+using System.Reflection;
+using System.Reflection.Emit;
#endif
- }
- catch (COMException) {
- if ((RootContext.StrongNameKeyFile == null) || (!RootContext.StrongNameDelaySign))
- throw;
-
- // FIXME: it seems Microsoft AssemblyBuilder doesn't like to delay sign assemblies
- Report.Error (1548, "Couldn't delay-sign the assembly with the '" +
- RootContext.StrongNameKeyFile +
- "', Use MCS with the Mono runtime or CSC to compile this assembly.");
- }
- catch (System.IO.IOException io) {
- Report.Error (16, "Could not write to file `"+name+"', cause: " + io.Message);
- return;
- }
- catch (System.UnauthorizedAccessException ua) {
- Report.Error (16, "Could not write to file `"+name+"', cause: " + ua.Message);
- return;
- }
- catch (System.NotImplementedException nie) {
- Report.RuntimeMissingSupport (Location.Null, nie.Message);
- return;
- }
-
- //
- // Write debuger symbol file
- //
- if (saveDebugInfo)
- SymbolWriter.WriteSymbolFile ();
- }
- }
-
+namespace Mono.CSharp
+{
/// <summary>
/// An Emit Context is created for each body of code (from methods,
/// properties bodies, indexer bodies or constructor bodies)
/// </summary>
- public class EmitContext {
-
- [Flags]
- public enum Options
- {
- /// <summary>
- /// This flag tracks the `checked' state of the compilation,
- /// it controls whether we should generate code that does overflow
- /// checking, or if we generate code that ignores overflows.
- ///
- /// The default setting comes from the command line option to generate
- /// checked or unchecked code plus any source code changes using the
- /// checked/unchecked statements or expressions. Contrast this with
- /// the ConstantCheckState flag.
- /// </summary>
- CheckedScope = 1 << 0,
-
- /// <summary>
- /// The constant check state is always set to `true' and cant be changed
- /// from the command line. The source code can change this setting with
- /// the `checked' and `unchecked' statements and expressions.
- /// </summary>
- ConstantCheckState = 1 << 1,
-
- AllCheckStateFlags = CheckedScope | ConstantCheckState,
-
- OmitDebugInfo = 1 << 2,
-
- ConstructorScope = 1 << 3
- }
-
- // utility helper for CheckExpr, UnCheckExpr, Checked and Unchecked statements
- // it's public so that we can use a struct at the callsite
- public struct FlagsHandle : IDisposable
- {
- EmitContext ec;
- readonly Options invmask, oldval;
-
- public FlagsHandle (EmitContext ec, Options flagsToSet)
- : this (ec, flagsToSet, flagsToSet)
- {
- }
-
- internal FlagsHandle (EmitContext ec, Options mask, Options val)
- {
- this.ec = ec;
- invmask = ~mask;
- oldval = ec.flags & mask;
- ec.flags = (ec.flags & invmask) | (val & mask);
- }
-
- public void Dispose ()
- {
- ec.flags = (ec.flags & invmask) | oldval;
- }
- }
-
- Options flags;
-
- public ILGenerator ig;
+ public class EmitContext : BuilderContext
+ {
+ // TODO: Has to be private
+ public readonly ILGenerator ig;
/// <summary>
/// The value that is allowed to be returned or NULL if there is no
/// return type.
/// </summary>
- protected Type return_type;
+ readonly TypeSpec return_type;
/// <summary>
/// Keeps track of the Type to LocalBuilder temporary storage created
/// to store structures (used to compute the address of the structure
/// value on structure method invocations)
/// </summary>
- public Hashtable temporary_storage;
+ Dictionary<TypeSpec, object> temporary_storage;
/// <summary>
/// The location where we store the return value.
/// </summary>
public bool HasReturnLabel;
+ /// <summary>
+ /// Current loop begin and end labels.
+ /// </summary>
+ public Label LoopBegin, LoopEnd;
+
+ /// <summary>
+ /// Default target in a switch statement. Only valid if
+ /// InSwitch is true
+ /// </summary>
+ public Label DefaultTarget;
+
+ /// <summary>
+ /// If this is non-null, points to the current switch statement
+ /// </summary>
+ public Switch Switch;
+
/// <summary>
/// Whether we are inside an anonymous method.
/// </summary>
public AnonymousExpression CurrentAnonymousMethod;
- public readonly IMemberContext MemberContext;
+ readonly IMemberContext member_context;
+
+ DynamicSiteClass dynamic_site_container;
- public EmitContext (IMemberContext rc, ILGenerator ig, Type return_type)
+ public EmitContext (IMemberContext rc, ILGenerator ig, TypeSpec return_type)
{
- this.MemberContext = rc;
+ this.member_context = rc;
this.ig = ig;
this.return_type = return_type;
+
+#if STATIC
+ ig.__CleverExceptionBlockAssistance ();
+#endif
}
- public Type CurrentType {
- get { return MemberContext.CurrentType; }
+ #region Properties
+
+ public TypeSpec CurrentType {
+ get { return member_context.CurrentType; }
}
public TypeParameter[] CurrentTypeParameters {
- get { return MemberContext.CurrentTypeParameters; }
+ get { return member_context.CurrentTypeParameters; }
}
- public TypeContainer CurrentTypeDefinition {
- get { return MemberContext.CurrentTypeDefinition; }
+ public MemberCore CurrentTypeDefinition {
+ get { return member_context.CurrentMemberDefinition; }
}
- public bool HasSet (Options options)
- {
- return (this.flags & options) == options;
+ public bool IsStatic {
+ get { return member_context.IsStatic; }
}
- // Temporarily set all the given flags to the given value. Should be used in an 'using' statement
- public FlagsHandle With (Options options, bool enable)
- {
- return new FlagsHandle (this, options, enable ? options : 0);
+ bool IsAnonymousStoreyMutateRequired {
+ get {
+ return CurrentAnonymousMethod != null &&
+ CurrentAnonymousMethod.Storey != null &&
+ CurrentAnonymousMethod.Storey.Mutator != null;
+ }
}
-
- public bool IsStatic {
- get { return MemberContext.IsStatic; }
+
+ public IMemberContext MemberContext {
+ get {
+ return member_context;
+ }
}
- public Type ReturnType {
+ public ModuleContainer Module {
+ get {
+ return member_context.Module;
+ }
+ }
+
+ // Has to be used for specific emitter errors only any
+ // possible resolver errors have to be reported during Resolve
+ public Report Report {
+ get {
+ return member_context.Module.Compiler.Report;
+ }
+ }
+
+ public TypeSpec ReturnType {
get {
return return_type;
}
}
+ #endregion
/// <summary>
/// This is called immediately before emitting an IL opcode to tell the symbol
SymbolWriter.DefineLocalVariable (name, builder);
}
- public void BeginScope ()
+ public void BeginCatchBlock (TypeSpec type)
{
- ig.BeginScope();
- SymbolWriter.OpenScope(ig);
+ ig.BeginCatchBlock (type.GetMetaInfo ());
}
- public void EndScope ()
+ public void BeginExceptionBlock ()
{
- ig.EndScope();
- SymbolWriter.CloseScope(ig);
+ ig.BeginExceptionBlock ();
}
- /// <summary>
- /// Returns a temporary storage for a variable of type t as
- /// a local variable in the current body.
- /// </summary>
- public LocalBuilder GetTemporaryLocal (Type t)
+ public void BeginFinallyBlock ()
{
- if (temporary_storage != null) {
- object o = temporary_storage [t];
- if (o != null) {
- if (o is Stack) {
- Stack s = (Stack) o;
- o = s.Count == 0 ? null : s.Pop ();
- } else {
- temporary_storage.Remove (t);
- }
- }
- if (o != null)
- return (LocalBuilder) o;
- }
- return ig.DeclareLocal (t);
+ ig.BeginFinallyBlock ();
}
- public void FreeTemporaryLocal (LocalBuilder b, Type t)
+ public void BeginScope ()
{
- if (temporary_storage == null) {
- temporary_storage = new Hashtable ();
- temporary_storage [t] = b;
- return;
- }
- object o = temporary_storage [t];
- if (o == null) {
- temporary_storage [t] = b;
- return;
- }
- Stack s = o as Stack;
- if (s == null) {
- s = new Stack ();
- s.Push (o);
- temporary_storage [t] = s;
- }
- s.Push (b);
+ SymbolWriter.OpenScope(ig);
}
- /// <summary>
- /// Current loop begin and end labels.
- /// </summary>
- public Label LoopBegin, LoopEnd;
-
- /// <summary>
- /// Default target in a switch statement. Only valid if
- /// InSwitch is true
- /// </summary>
- public Label DefaultTarget;
-
- /// <summary>
- /// If this is non-null, points to the current switch statement
- /// </summary>
- public Switch Switch;
-
- /// <summary>
- /// ReturnValue creates on demand the LocalBuilder for the
- /// return value from the function. By default this is not
- /// used. This is only required when returns are found inside
- /// Try or Catch statements.
- ///
- /// This method is typically invoked from the Emit phase, so
- /// we allow the creation of a return label if it was not
- /// requested during the resolution phase. Could be cleaned
- /// up, but it would replicate a lot of logic in the Emit phase
- /// of the code that uses it.
- /// </summary>
- public LocalBuilder TemporaryReturn ()
+ public void EndExceptionBlock ()
{
- if (return_value == null){
- return_value = ig.DeclareLocal (return_type);
- if (!HasReturnLabel){
- ReturnLabel = ig.DefineLabel ();
- HasReturnLabel = true;
- }
- }
+ ig.EndExceptionBlock ();
+ }
- return return_value;
+ public void EndScope ()
+ {
+ SymbolWriter.CloseScope(ig);
}
- }
- public abstract class CommonAssemblyModulClass : Attributable, IMemberContext
- {
- public void AddAttributes (ArrayList attrs, IMemberContext context)
+ //
+ // Creates a nested container in this context for all dynamic compiler generated stuff
+ //
+ public DynamicSiteClass CreateDynamicSite ()
{
- foreach (Attribute a in attrs)
- a.AttachTo (this, context);
+ if (dynamic_site_container == null) {
+ var mc = member_context.CurrentMemberDefinition as MemberBase;
+ dynamic_site_container = new DynamicSiteClass (CurrentTypeDefinition.Parent.PartialContainer, mc, CurrentTypeParameters);
- if (attributes == null) {
- attributes = new Attributes (attrs);
- return;
+ CurrentTypeDefinition.Module.AddCompilerGeneratedClass (dynamic_site_container);
+ dynamic_site_container.CreateType ();
+ dynamic_site_container.DefineType ();
+ dynamic_site_container.ResolveTypeParameters ();
+ dynamic_site_container.Define ();
}
- attributes.AddAttributes (attrs);
+
+ return dynamic_site_container;
}
- public virtual void Emit (TypeContainer tc)
+ public LocalBuilder DeclareLocal (TypeSpec type, bool pinned)
{
- if (OptAttributes == null)
- return;
+ if (IsAnonymousStoreyMutateRequired)
+ type = CurrentAnonymousMethod.Storey.Mutator.Mutate (type);
- OptAttributes.Emit ();
+ return ig.DeclareLocal (type.GetMetaInfo (), pinned);
}
- protected Attribute ResolveAttribute (PredefinedAttribute a_type)
+ public Label DefineLabel ()
{
- Attribute a = OptAttributes.Search (a_type);
- if (a != null) {
- a.Resolve ();
- }
- return a;
- }
-
- #region IMemberContext Members
-
- public Type CurrentType {
- get { return null; }
+ return ig.DefineLabel ();
}
- public TypeParameter[] CurrentTypeParameters {
- get { return null; }
+ public void MarkLabel (Label label)
+ {
+ ig.MarkLabel (label);
}
- public TypeContainer CurrentTypeDefinition {
- get { return RootContext.ToplevelTypes; }
+ public void Emit (OpCode opcode)
+ {
+ ig.Emit (opcode);
}
- public string GetSignatureForError ()
+ public void Emit (OpCode opcode, LocalBuilder local)
{
- return "<module>";
+ ig.Emit (opcode, local);
}
- public bool IsObsolete {
- get { return false; }
+ public void Emit (OpCode opcode, string arg)
+ {
+ ig.Emit (opcode, arg);
}
- public bool IsUnsafe {
- get { return false; }
+ public void Emit (OpCode opcode, double arg)
+ {
+ ig.Emit (opcode, arg);
}
- public bool IsStatic {
- get { return false; }
+ public void Emit (OpCode opcode, float arg)
+ {
+ ig.Emit (opcode, arg);
}
- public ExtensionMethodGroupExpr LookupExtensionMethod (Type extensionType, string name, Location loc)
+ public void Emit (OpCode opcode, int arg)
{
- throw new NotImplementedException ();
+ ig.Emit (opcode, arg);
}
- public FullNamedExpression LookupNamespaceOrType (string name, Location loc, bool ignore_cs0104)
+ public void Emit (OpCode opcode, byte arg)
{
- return RootContext.ToplevelTypes.LookupNamespaceOrType (name, loc, ignore_cs0104);
+ ig.Emit (opcode, arg);
}
- public FullNamedExpression LookupNamespaceAlias (string name)
+ public void Emit (OpCode opcode, Label label)
{
- return null;
+ ig.Emit (opcode, label);
}
- #endregion
- }
-
- public class AssemblyClass : CommonAssemblyModulClass {
- // TODO: make it private and move all builder based methods here
- public AssemblyBuilder Builder;
- bool is_cls_compliant;
- bool wrap_non_exception_throws;
-
- public Attribute ClsCompliantAttribute;
-
- ListDictionary declarative_security;
- bool has_extension_method;
- public AssemblyName Name;
- MethodInfo add_type_forwarder;
- ListDictionary emitted_forwarders;
-
- // Module is here just because of error messages
- static string[] attribute_targets = new string [] { "assembly", "module" };
-
- public AssemblyClass (): base ()
+ public void Emit (OpCode opcode, Label[] labels)
{
- wrap_non_exception_throws = true;
+ ig.Emit (opcode, labels);
}
- public bool HasExtensionMethods {
- set {
- has_extension_method = value;
- }
- }
+ public void Emit (OpCode opcode, TypeSpec type)
+ {
+ if (IsAnonymousStoreyMutateRequired)
+ type = CurrentAnonymousMethod.Storey.Mutator.Mutate (type);
- public bool IsClsCompliant {
- get {
- return is_cls_compliant;
- }
+ ig.Emit (opcode, type.GetMetaInfo ());
}
- public bool WrapNonExceptionThrows {
- get {
- return wrap_non_exception_throws;
- }
- }
+ public void Emit (OpCode opcode, FieldSpec field)
+ {
+ if (IsAnonymousStoreyMutateRequired)
+ field = field.Mutate (CurrentAnonymousMethod.Storey.Mutator);
- public override AttributeTargets AttributeTargets {
- get {
- return AttributeTargets.Assembly;
- }
+ ig.Emit (opcode, field.GetMetaInfo ());
}
- public override bool IsClsComplianceRequired ()
+ public void Emit (OpCode opcode, MethodSpec method)
{
- return is_cls_compliant;
+ if (IsAnonymousStoreyMutateRequired)
+ method = method.Mutate (CurrentAnonymousMethod.Storey.Mutator);
+
+ if (method.IsConstructor)
+ ig.Emit (opcode, (ConstructorInfo) method.GetMetaInfo ());
+ else
+ ig.Emit (opcode, (MethodInfo) method.GetMetaInfo ());
}
- public void Resolve ()
+ // TODO: REMOVE breaks mutator
+ public void Emit (OpCode opcode, MethodInfo method)
{
- if (RootContext.Unsafe) {
- //
- // Emits [assembly: SecurityPermissionAttribute (SecurityAction.RequestMinimum, SkipVerification = true)]
- // when -unsafe option was specified
- //
-
- Location loc = Location.Null;
-
- MemberAccess system_security_permissions = new MemberAccess (new MemberAccess (
- new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Security", loc), "Permissions", loc);
-
- Arguments pos = new Arguments (1);
- pos.Add (new Argument (new MemberAccess (new MemberAccess (system_security_permissions, "SecurityAction", loc), "RequestMinimum")));
-
- Arguments named = new Arguments (1);
- named.Add (new NamedArgument (new LocatedToken (loc, "SkipVerification"), (new BoolLiteral (true, loc))));
-
- GlobalAttribute g = new GlobalAttribute (new NamespaceEntry (null, null, null), "assembly",
- new MemberAccess (system_security_permissions, "SecurityPermissionAttribute"),
- new Arguments[] { pos, named }, loc, false);
- g.AttachTo (this, this);
-
- if (g.Resolve () != null) {
- declarative_security = new ListDictionary ();
- g.ExtractSecurityPermissionSet (declarative_security);
- }
- }
-
- if (OptAttributes == null)
- return;
-
- // Ensure that we only have GlobalAttributes, since the Search isn't safe with other types.
- if (!OptAttributes.CheckTargets())
- return;
-
- ClsCompliantAttribute = ResolveAttribute (PredefinedAttributes.Get.CLSCompliant);
-
- if (ClsCompliantAttribute != null) {
- is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue ();
- }
-
- Attribute a = ResolveAttribute (PredefinedAttributes.Get.RuntimeCompatibility);
- if (a != null) {
- object val = a.GetPropertyValue ("WrapNonExceptionThrows");
- if (val != null)
- wrap_non_exception_throws = (bool) val;
- }
+ ig.Emit (opcode, method);
}
- // fix bug #56621
- private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
+ public void Emit (OpCode opcode, MethodSpec method, MetaType[] vargs)
{
- try {
- // check for possible ECMA key
- if (strongNameBlob.Length == 16) {
- // will be rejected if not "the" ECMA key
- an.SetPublicKey (strongNameBlob);
- }
- else {
- // take it, with or without, a private key
- RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
- // and make sure we only feed the public part to Sys.Ref
- byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
-
- // AssemblyName.SetPublicKey requires an additional header
- byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
-
- byte[] encodedPublicKey = new byte [12 + publickey.Length];
- Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
- Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
- an.SetPublicKey (encodedPublicKey);
- }
- }
- catch (Exception) {
- Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' is incorrectly encoded");
- Environment.Exit (1);
- }
+ // TODO MemberCache: This should mutate too
+ ig.EmitCall (opcode, (MethodInfo) method.GetMetaInfo (), vargs);
}
- // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
- public AssemblyName GetAssemblyName (string name, string output)
+ public void EmitArrayNew (ArrayContainer ac)
{
- if (OptAttributes != null) {
- foreach (Attribute a in OptAttributes.Attrs) {
- // cannot rely on any resolve-based members before you call Resolve
- if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
- continue;
-
- // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
- // However, this is invoked by CodeGen.Init, when none of the namespaces
- // are loaded yet.
- // TODO: Does not handle quoted attributes properly
- switch (a.Name) {
- case "AssemblyKeyFile":
- case "AssemblyKeyFileAttribute":
- case "System.Reflection.AssemblyKeyFileAttribute":
- if (RootContext.StrongNameKeyFile != null) {
- Report.SymbolRelatedToPreviousError (a.Location, a.GetSignatureForError ());
- Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
- "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
- } else {
- string value = a.GetString ();
- if (value != null && value.Length != 0)
- RootContext.StrongNameKeyFile = value;
- }
- break;
- case "AssemblyKeyName":
- case "AssemblyKeyNameAttribute":
- case "System.Reflection.AssemblyKeyNameAttribute":
- if (RootContext.StrongNameKeyContainer != null) {
- Report.SymbolRelatedToPreviousError (a.Location, a.GetSignatureForError ());
- Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
- "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
- } else {
- string value = a.GetString ();
- if (value != null && value.Length != 0)
- RootContext.StrongNameKeyContainer = value;
- }
- break;
- case "AssemblyDelaySign":
- case "AssemblyDelaySignAttribute":
- case "System.Reflection.AssemblyDelaySignAttribute":
- RootContext.StrongNameDelaySign = a.GetBoolean ();
- break;
- }
- }
- }
-
- AssemblyName an = new AssemblyName ();
- an.Name = Path.GetFileNameWithoutExtension (name);
-
- // note: delay doesn't apply when using a key container
- if (RootContext.StrongNameKeyContainer != null) {
- an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
- return an;
- }
-
- // strongname is optional
- if (RootContext.StrongNameKeyFile == null)
- return an;
-
- string AssemblyDir = Path.GetDirectoryName (output);
+ if (ac.Rank == 1) {
+ Emit (OpCodes.Newarr, ac.Element);
+ } else {
+ if (IsAnonymousStoreyMutateRequired)
+ ac = (ArrayContainer) ac.Mutate (CurrentAnonymousMethod.Storey.Mutator);
- // the StrongName key file may be relative to (a) the compiled
- // file or (b) to the output assembly. See bugzilla #55320
- // http://bugzilla.ximian.com/show_bug.cgi?id=55320
-
- // (a) relative to the compiled file
- string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
- bool exist = File.Exists (filename);
- if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
- // (b) relative to the outputed assembly
- filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
- exist = File.Exists (filename);
+ ig.Emit (OpCodes.Newobj, ac.GetConstructor ());
}
-
- if (exist) {
- using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
- byte[] snkeypair = new byte [fs.Length];
- fs.Read (snkeypair, 0, snkeypair.Length);
-
- if (RootContext.StrongNameDelaySign) {
- // delayed signing - DO NOT include private key
- SetPublicKey (an, snkeypair);
- }
- else {
- // no delay so we make sure we have the private key
- try {
- CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
- an.KeyPair = new StrongNameKeyPair (snkeypair);
- }
- catch (CryptographicException) {
- if (snkeypair.Length == 16) {
- // error # is different for ECMA key
- Report.Error (1606, "Could not sign the assembly. " +
- "ECMA key can only be used to delay-sign assemblies");
- }
- else {
- Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not have a private key");
- }
- return null;
- }
- }
- }
- }
- else {
- Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not exist");
- return null;
- }
- return an;
}
- void Error_AssemblySigning (string text)
+ public void EmitArrayAddress (ArrayContainer ac)
{
- Report.Error (1548, "Error during assembly signing. " + text);
- }
+ if (ac.Element.IsGenericParameter)
+ ig.Emit (OpCodes.Readonly);
- bool CheckInternalsVisibleAttribute (Attribute a)
- {
- string assembly_name = a.GetString ();
- if (assembly_name.Length == 0)
- return false;
-
- AssemblyName aname = null;
- try {
-#if GMCS_SOURCE
- aname = new AssemblyName (assembly_name);
-#else
- throw new NotSupportedException ();
-#endif
- } catch (FileLoadException) {
- } catch (ArgumentException) {
- }
-
- // Bad assembly name format
- if (aname == null)
- Report.Warning (1700, 3, a.Location, "Assembly reference `" + assembly_name + "' is invalid and cannot be resolved");
- // Report error if we have defined Version or Culture
- else if (aname.Version != null || aname.CultureInfo != null)
- throw new Exception ("Friend assembly `" + a.GetString () +
- "' is invalid. InternalsVisibleTo cannot have version or culture specified.");
- else if (aname.GetPublicKey () == null && Name.GetPublicKey () != null && Name.GetPublicKey ().Length != 0) {
- Report.Error (1726, a.Location, "Friend assembly reference `" + aname.FullName + "' is invalid." +
- " Strong named assemblies must specify a public key in their InternalsVisibleTo declarations");
- return false;
- }
+ if (ac.Rank > 1) {
+ if (IsAnonymousStoreyMutateRequired)
+ ac = (ArrayContainer) ac.Mutate (CurrentAnonymousMethod.Storey.Mutator);
- return true;
+ ig.Emit (OpCodes.Call, ac.GetAddressMethod ());
+ } else {
+ Emit (OpCodes.Ldelema, ac.Element);
+ }
}
- static bool IsValidAssemblyVersion (string version)
+ //
+ // Emits the right opcode to load from an array
+ //
+ public void EmitArrayLoad (ArrayContainer ac)
{
- Version v;
- try {
- v = new Version (version);
- } catch {
- try {
- int major = int.Parse (version, CultureInfo.InvariantCulture);
- v = new Version (major, 0);
- } catch {
- return false;
- }
- }
+ if (ac.Rank > 1) {
+ if (IsAnonymousStoreyMutateRequired)
+ ac = (ArrayContainer) ac.Mutate (CurrentAnonymousMethod.Storey.Mutator);
- foreach (int candidate in new int [] { v.Major, v.Minor, v.Build, v.Revision }) {
- if (candidate > ushort.MaxValue)
- return false;
+ ig.Emit (OpCodes.Call, ac.GetGetMethod ());
+ return;
}
- return true;
+ var type = ac.Element;
+ if (TypeManager.IsEnumType (type))
+ type = EnumSpec.GetUnderlyingType (type);
+
+ if (type == TypeManager.byte_type || type == TypeManager.bool_type)
+ Emit (OpCodes.Ldelem_U1);
+ else if (type == TypeManager.sbyte_type)
+ Emit (OpCodes.Ldelem_I1);
+ else if (type == TypeManager.short_type)
+ Emit (OpCodes.Ldelem_I2);
+ else if (type == TypeManager.ushort_type || type == TypeManager.char_type)
+ Emit (OpCodes.Ldelem_U2);
+ else if (type == TypeManager.int32_type)
+ Emit (OpCodes.Ldelem_I4);
+ else if (type == TypeManager.uint32_type)
+ Emit (OpCodes.Ldelem_U4);
+ else if (type == TypeManager.uint64_type)
+ Emit (OpCodes.Ldelem_I8);
+ else if (type == TypeManager.int64_type)
+ Emit (OpCodes.Ldelem_I8);
+ else if (type == TypeManager.float_type)
+ Emit (OpCodes.Ldelem_R4);
+ else if (type == TypeManager.double_type)
+ Emit (OpCodes.Ldelem_R8);
+ else if (type == TypeManager.intptr_type)
+ Emit (OpCodes.Ldelem_I);
+ else if (TypeManager.IsStruct (type)) {
+ Emit (OpCodes.Ldelema, type);
+ Emit (OpCodes.Ldobj, type);
+ } else if (type.IsGenericParameter) {
+ Emit (OpCodes.Ldelem, type);
+ } else if (type.IsPointer)
+ Emit (OpCodes.Ldelem_I);
+ else
+ Emit (OpCodes.Ldelem_Ref);
}
- public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
+ //
+ // Emits the right opcode to store to an array
+ //
+ public void EmitArrayStore (ArrayContainer ac)
{
- if (a.IsValidSecurityAttribute ()) {
- if (declarative_security == null)
- declarative_security = new ListDictionary ();
+ if (ac.Rank > 1) {
+ if (IsAnonymousStoreyMutateRequired)
+ ac = (ArrayContainer) ac.Mutate (CurrentAnonymousMethod.Storey.Mutator);
- a.ExtractSecurityPermissionSet (declarative_security);
+ ig.Emit (OpCodes.Call, ac.GetSetMethod ());
return;
}
- if (a.Type == pa.AssemblyCulture) {
- string value = a.GetString ();
- if (value == null || value.Length == 0)
- return;
-
- if (RootContext.Target == Target.Exe) {
- a.Error_AttributeEmitError ("The executables cannot be satelite assemblies, remove the attribute or keep it empty");
- return;
- }
- }
-
- if (a.Type == pa.AssemblyVersion) {
- string value = a.GetString ();
- if (value == null || value.Length == 0)
- return;
+ var type = ac.Element;
+
+ if (type.IsEnum)
+ type = EnumSpec.GetUnderlyingType (type);
+
+ if (type == TypeManager.byte_type || type == TypeManager.sbyte_type || type == TypeManager.bool_type)
+ Emit (OpCodes.Stelem_I1);
+ else if (type == TypeManager.short_type || type == TypeManager.ushort_type || type == TypeManager.char_type)
+ Emit (OpCodes.Stelem_I2);
+ else if (type == TypeManager.int32_type || type == TypeManager.uint32_type)
+ Emit (OpCodes.Stelem_I4);
+ else if (type == TypeManager.int64_type || type == TypeManager.uint64_type)
+ Emit (OpCodes.Stelem_I8);
+ else if (type == TypeManager.float_type)
+ Emit (OpCodes.Stelem_R4);
+ else if (type == TypeManager.double_type)
+ Emit (OpCodes.Stelem_R8);
+ else if (type == TypeManager.intptr_type)
+ Emit (OpCodes.Stobj, type);
+ else if (TypeManager.IsStruct (type))
+ Emit (OpCodes.Stobj, type);
+ else if (type.IsGenericParameter)
+ Emit (OpCodes.Stelem, type);
+ else if (type.IsPointer)
+ Emit (OpCodes.Stelem_I);
+ else
+ Emit (OpCodes.Stelem_Ref);
+ }
+
+ public void EmitInt (int i)
+ {
+ switch (i) {
+ case -1:
+ ig.Emit (OpCodes.Ldc_I4_M1);
+ break;
- value = value.Replace ('*', '0');
+ case 0:
+ ig.Emit (OpCodes.Ldc_I4_0);
+ break;
- if (!IsValidAssemblyVersion (value)) {
- a.Error_AttributeEmitError (string.Format ("Specified version `{0}' is not valid", value));
- return;
- }
- }
+ case 1:
+ ig.Emit (OpCodes.Ldc_I4_1);
+ break;
- if (a.Type == pa.InternalsVisibleTo && !CheckInternalsVisibleAttribute (a))
- return;
+ case 2:
+ ig.Emit (OpCodes.Ldc_I4_2);
+ break;
- if (a.Type == pa.TypeForwarder) {
- Type t = a.GetArgumentType ();
- if (t == null || TypeManager.HasElementType (t)) {
- Report.Error (735, a.Location, "Invalid type specified as an argument for TypeForwardedTo attribute");
- return;
- }
+ case 3:
+ ig.Emit (OpCodes.Ldc_I4_3);
+ break;
- t = TypeManager.DropGenericTypeArguments (t);
- if (emitted_forwarders == null) {
- emitted_forwarders = new ListDictionary();
- } else if (emitted_forwarders.Contains(t)) {
- Report.SymbolRelatedToPreviousError(((Attribute)emitted_forwarders[t]).Location, null);
- Report.Error(739, a.Location, "A duplicate type forward of type `{0}'",
- TypeManager.CSharpName(t));
- return;
- }
+ case 4:
+ ig.Emit (OpCodes.Ldc_I4_4);
+ break;
- emitted_forwarders.Add(t, a);
+ case 5:
+ ig.Emit (OpCodes.Ldc_I4_5);
+ break;
- if (TypeManager.LookupDeclSpace (t) != null) {
- Report.SymbolRelatedToPreviousError (t);
- Report.Error (729, a.Location, "Cannot forward type `{0}' because it is defined in this assembly",
- TypeManager.CSharpName (t));
- return;
- }
+ case 6:
+ ig.Emit (OpCodes.Ldc_I4_6);
+ break;
- if (t.DeclaringType != null) {
- Report.Error (730, a.Location, "Cannot forward type `{0}' because it is a nested type",
- TypeManager.CSharpName (t));
- return;
- }
+ case 7:
+ ig.Emit (OpCodes.Ldc_I4_7);
+ break;
- if (add_type_forwarder == null) {
- add_type_forwarder = typeof (AssemblyBuilder).GetMethod ("AddTypeForwarder",
- BindingFlags.NonPublic | BindingFlags.Instance);
+ case 8:
+ ig.Emit (OpCodes.Ldc_I4_8);
+ break;
- if (add_type_forwarder == null) {
- Report.RuntimeMissingSupport (a.Location, "TypeForwardedTo attribute");
- return;
- }
- }
+ default:
+ if (i >= -128 && i <= 127) {
+ ig.Emit (OpCodes.Ldc_I4_S, (sbyte) i);
+ } else
+ ig.Emit (OpCodes.Ldc_I4, i);
+ break;
+ }
+ }
- add_type_forwarder.Invoke (Builder, new object[] { t });
+ public void EmitLong (long l)
+ {
+ if (l >= int.MinValue && l <= int.MaxValue) {
+ EmitInt (unchecked ((int) l));
+ ig.Emit (OpCodes.Conv_I8);
return;
}
-
- if (a.Type == pa.Extension) {
- a.Error_MisusedExtensionAttribute ();
+
+ if (l >= 0 && l <= uint.MaxValue) {
+ EmitInt (unchecked ((int) l));
+ ig.Emit (OpCodes.Conv_U8);
return;
}
- Builder.SetCustomAttribute (cb);
+ ig.Emit (OpCodes.Ldc_I8, l);
}
- public override void Emit (TypeContainer tc)
- {
- base.Emit (tc);
-
- if (has_extension_method)
- PredefinedAttributes.Get.Extension.EmitAttribute (Builder);
-
- // FIXME: Does this belong inside SRE.AssemblyBuilder instead?
- PredefinedAttribute pa = PredefinedAttributes.Get.RuntimeCompatibility;
- if (pa.IsDefined && (OptAttributes == null || !OptAttributes.Contains (pa))) {
- ConstructorInfo ci = TypeManager.GetPredefinedConstructor (
- pa.Type, Location.Null, Type.EmptyTypes);
- PropertyInfo [] pis = new PropertyInfo [1];
- pis [0] = TypeManager.GetPredefinedProperty (pa.Type,
- "WrapNonExceptionThrows", Location.Null, TypeManager.bool_type);
- object [] pargs = new object [1];
- pargs [0] = true;
- Builder.SetCustomAttribute (new CustomAttributeBuilder (ci, new object [0], pis, pargs));
- }
-
- if (declarative_security != null) {
-
- MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
- object builder_instance = Builder;
+ //
+ // Load the object from the pointer.
+ //
+ public void EmitLoadFromPtr (TypeSpec t)
+ {
+ if (t == TypeManager.int32_type)
+ ig.Emit (OpCodes.Ldind_I4);
+ else if (t == TypeManager.uint32_type)
+ ig.Emit (OpCodes.Ldind_U4);
+ else if (t == TypeManager.short_type)
+ ig.Emit (OpCodes.Ldind_I2);
+ else if (t == TypeManager.ushort_type)
+ ig.Emit (OpCodes.Ldind_U2);
+ else if (t == TypeManager.char_type)
+ ig.Emit (OpCodes.Ldind_U2);
+ else if (t == TypeManager.byte_type)
+ ig.Emit (OpCodes.Ldind_U1);
+ else if (t == TypeManager.sbyte_type)
+ ig.Emit (OpCodes.Ldind_I1);
+ else if (t == TypeManager.uint64_type)
+ ig.Emit (OpCodes.Ldind_I8);
+ else if (t == TypeManager.int64_type)
+ ig.Emit (OpCodes.Ldind_I8);
+ else if (t == TypeManager.float_type)
+ ig.Emit (OpCodes.Ldind_R4);
+ else if (t == TypeManager.double_type)
+ ig.Emit (OpCodes.Ldind_R8);
+ else if (t == TypeManager.bool_type)
+ ig.Emit (OpCodes.Ldind_I1);
+ else if (t == TypeManager.intptr_type)
+ ig.Emit (OpCodes.Ldind_I);
+ else if (t.IsEnum) {
+ if (t == TypeManager.enum_type)
+ ig.Emit (OpCodes.Ldind_Ref);
+ else
+ EmitLoadFromPtr (EnumSpec.GetUnderlyingType (t));
+ } else if (TypeManager.IsStruct (t) || TypeManager.IsGenericParameter (t))
+ Emit (OpCodes.Ldobj, t);
+ else if (t.IsPointer)
+ ig.Emit (OpCodes.Ldind_I);
+ else
+ ig.Emit (OpCodes.Ldind_Ref);
+ }
- try {
- // Microsoft runtime hacking
- if (add_permission == null) {
- Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
- add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
+ //
+ // The stack contains the pointer and the value of type `type'
+ //
+ public void EmitStoreFromPtr (TypeSpec type)
+ {
+ if (type.IsEnum)
+ type = EnumSpec.GetUnderlyingType (type);
+
+ if (type == TypeManager.int32_type || type == TypeManager.uint32_type)
+ ig.Emit (OpCodes.Stind_I4);
+ else if (type == TypeManager.int64_type || type == TypeManager.uint64_type)
+ ig.Emit (OpCodes.Stind_I8);
+ else if (type == TypeManager.char_type || type == TypeManager.short_type ||
+ type == TypeManager.ushort_type)
+ ig.Emit (OpCodes.Stind_I2);
+ else if (type == TypeManager.float_type)
+ ig.Emit (OpCodes.Stind_R4);
+ else if (type == TypeManager.double_type)
+ ig.Emit (OpCodes.Stind_R8);
+ else if (type == TypeManager.byte_type || type == TypeManager.sbyte_type ||
+ type == TypeManager.bool_type)
+ ig.Emit (OpCodes.Stind_I1);
+ else if (type == TypeManager.intptr_type)
+ ig.Emit (OpCodes.Stind_I);
+ else if (TypeManager.IsStruct (type) || TypeManager.IsGenericParameter (type))
+ Emit (OpCodes.Stobj, type);
+ else
+ ig.Emit (OpCodes.Stind_Ref);
+ }
- FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
- builder_instance = fi.GetValue (Builder);
+ /// <summary>
+ /// Returns a temporary storage for a variable of type t as
+ /// a local variable in the current body.
+ /// </summary>
+ public LocalBuilder GetTemporaryLocal (TypeSpec t)
+ {
+ if (temporary_storage != null) {
+ object o;
+ if (temporary_storage.TryGetValue (t, out o)) {
+ if (o is Stack<LocalBuilder>) {
+ var s = (Stack<LocalBuilder>) o;
+ o = s.Count == 0 ? null : s.Pop ();
+ } else {
+ temporary_storage.Remove (t);
}
-
- object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
- declarative_security [SecurityAction.RequestOptional],
- declarative_security [SecurityAction.RequestRefuse] };
- add_permission.Invoke (builder_instance, args);
- }
- catch {
- Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
}
+ if (o != null)
+ return (LocalBuilder) o;
}
+ return DeclareLocal (t, false);
}
- public override string[] ValidAttributeTargets {
- get {
- return attribute_targets;
+ public void FreeTemporaryLocal (LocalBuilder b, TypeSpec t)
+ {
+ if (temporary_storage == null) {
+ temporary_storage = new Dictionary<TypeSpec, object> (ReferenceEquality<TypeSpec>.Default);
+ temporary_storage.Add (t, b);
+ return;
}
- }
-
- // Wrapper for AssemblyBuilder.AddModule
- static MethodInfo adder_method;
- static public MethodInfo AddModule_Method {
- get {
- if (adder_method == null)
- adder_method = typeof (AssemblyBuilder).GetMethod ("AddModule", BindingFlags.Instance|BindingFlags.NonPublic);
- return adder_method;
+ object o;
+
+ if (!temporary_storage.TryGetValue (t, out o)) {
+ temporary_storage.Add (t, b);
+ return;
+ }
+ var s = o as Stack<LocalBuilder>;
+ if (s == null) {
+ s = new Stack<LocalBuilder> ();
+ s.Push ((LocalBuilder)o);
+ temporary_storage [t] = s;
}
+ s.Push (b);
}
- public Module AddModule (string module)
+
+ /// <summary>
+ /// ReturnValue creates on demand the LocalBuilder for the
+ /// return value from the function. By default this is not
+ /// used. This is only required when returns are found inside
+ /// Try or Catch statements.
+ ///
+ /// This method is typically invoked from the Emit phase, so
+ /// we allow the creation of a return label if it was not
+ /// requested during the resolution phase. Could be cleaned
+ /// up, but it would replicate a lot of logic in the Emit phase
+ /// of the code that uses it.
+ /// </summary>
+ public LocalBuilder TemporaryReturn ()
{
- MethodInfo m = AddModule_Method;
- if (m == null) {
- Report.RuntimeMissingSupport (Location.Null, "/addmodule");
- Environment.Exit (1);
+ if (return_value == null){
+ return_value = DeclareLocal (return_type, false);
+ if (!HasReturnLabel){
+ ReturnLabel = DefineLabel ();
+ HasReturnLabel = true;
+ }
}
- try {
- return (Module) m.Invoke (Builder, new object [] { module });
- } catch (TargetInvocationException ex) {
- throw ex.InnerException;
- }
- }
+ return return_value;
+ }
}
}
projects / mono.git / blobdiff