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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Reflection.Metadata;
using System.Reflection.Metadata.Ecma335;
using System.Reflection.PortableExecutable;
using System.Security.Cryptography;
using System.Text;
using System.Threading;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Emit;
using Microsoft.CodeAnalysis.Text;
using Microsoft.DiaSymReader;
using static Microsoft.CodeAnalysis.SigningUtilities;
using EmitContext = Microsoft.CodeAnalysis.Emit.EmitContext;
namespace Microsoft.Cci
{
internal sealed class PeWritingException : Exception
{
public PeWritingException(Exception inner)
: base(inner.Message, inner)
{ }
}
internal static class PeWriter
{
internal struct EmitBuilders
{
internal BlobBuilder IlBlobBuilder;
internal PooledBlobBuilder? MappedFieldDataBlobBuilder;
internal PooledBlobBuilder? ManagedResourceBlobBuilder;
internal PooledBlobBuilder? PortableExecutableBlobBuilder;
internal PooledBlobBuilder? PortablePdbBlobBuilder;
public EmitBuilders()
{
IlBlobBuilder = new BlobBuilder(32 * 1024);
MappedFieldDataBlobBuilder = null;
ManagedResourceBlobBuilder = null;
PortableExecutableBlobBuilder = null;
PortablePdbBlobBuilder = null;
}
internal void Free()
{
// There is a bug in LinkSuffix / LinkPrefix which causes the ownership to not
// transfer when these have Count of 0. To avoid this problem we should not be
// creating these builders unless we will actually put content into them.
//
// https://github.com/dotnet/runtime/issues/99266
Debug.Assert(ManagedResourceBlobBuilder == null || ManagedResourceBlobBuilder.Count > 0);
Debug.Assert(MappedFieldDataBlobBuilder == null || MappedFieldDataBlobBuilder.Count > 0);
if (PortableExecutableBlobBuilder is null)
{
MappedFieldDataBlobBuilder?.Free();
ManagedResourceBlobBuilder?.Free();
}
else
{
// Once PortableExecutableBuilder is created it becomes the owner of the
// MappedFieldDataBuilder and ManagedResourceBuilder instances. Freeing
// it is sufficient to free both of them.
PortableExecutableBlobBuilder.Free();
}
PortablePdbBlobBuilder?.Free();
}
}
internal static bool WritePeToStream(
EmitContext context,
CommonMessageProvider messageProvider,
Func<Stream?> getPeStream,
Func<Stream?>? getPortablePdbStreamOpt,
PdbWriter? nativePdbWriterOpt,
string? pdbPathOpt,
bool metadataOnly,
bool isDeterministic,
bool emitTestCoverageData,
RSAParameters? privateKeyOpt,
CancellationToken cancellationToken)
{
// If PDB writer is given, we have to have PDB path.
Debug.Assert(nativePdbWriterOpt == null || pdbPathOpt != null);
var mdWriter = FullMetadataWriter.Create(context, messageProvider, metadataOnly, isDeterministic,
emitTestCoverageData, getPortablePdbStreamOpt != null, cancellationToken);
var properties = context.Module.SerializationProperties;
context.Module.TestData?.SetMetadataWriter(mdWriter);
nativePdbWriterOpt?.SetMetadataEmitter(mdWriter);
// Since we are producing a full assembly, we should not have a module version ID
// imposed ahead-of time. Instead we will compute a deterministic module version ID
// based on the contents of the generated stream.
Debug.Assert(properties.PersistentIdentifier == default(Guid));
var emitBuilders = new EmitBuilders();
try
{
Blob mvidFixup, mvidStringFixup;
mdWriter.BuildMetadataAndIL(
nativePdbWriterOpt,
emitBuilders.IlBlobBuilder,
out emitBuilders.MappedFieldDataBlobBuilder,
out emitBuilders.ManagedResourceBlobBuilder,
out mvidFixup,
out mvidStringFixup);
MethodDefinitionHandle entryPointHandle;
MethodDefinitionHandle debugEntryPointHandle;
mdWriter.GetEntryPoints(out entryPointHandle, out debugEntryPointHandle);
if (!debugEntryPointHandle.IsNil)
{
nativePdbWriterOpt?.SetEntryPoint(MetadataTokens.GetToken(debugEntryPointHandle));
}
if (nativePdbWriterOpt != null)
{
if (context.Module.SourceLinkStreamOpt != null)
{
nativePdbWriterOpt.EmbedSourceLink(context.Module.SourceLinkStreamOpt);
}
if (mdWriter.Module.OutputKind == OutputKind.WindowsRuntimeMetadata)
{
// Dev12: If compiling to winmdobj, we need to add to PDB source spans of
// all types and members for better error reporting by WinMDExp.
nativePdbWriterOpt.WriteDefinitionLocations(mdWriter.Module.GetSymbolToLocationMap());
}
else
{
#if DEBUG
// validate that all definitions are writable
// if same scenario would happen in a winmdobj project
nativePdbWriterOpt.AssertAllDefinitionsHaveTokens(mdWriter.Module.GetSymbolToLocationMap());
#endif
}
nativePdbWriterOpt.WriteRemainingDebugDocuments(mdWriter.Module.DebugDocumentsBuilder.DebugDocuments);
nativePdbWriterOpt.WriteCompilerVersion(context.Module.CommonCompilation.Language);
}
Stream? peStream = getPeStream();
if (peStream == null)
{
return false;
}
BlobContentId pdbContentId = nativePdbWriterOpt?.GetContentId() ?? default;
// the writer shall not be used after this point for writing:
nativePdbWriterOpt = null;
ushort portablePdbVersion = 0;
var metadataRootBuilder = mdWriter.GetRootBuilder();
var peHeaderBuilder = new PEHeaderBuilder(
machine: properties.Machine,
sectionAlignment: properties.SectionAlignment,
fileAlignment: properties.FileAlignment,
imageBase: properties.BaseAddress,
majorLinkerVersion: properties.LinkerMajorVersion,
minorLinkerVersion: properties.LinkerMinorVersion,
majorOperatingSystemVersion: 4,
minorOperatingSystemVersion: 0,
majorImageVersion: 0,
minorImageVersion: 0,
majorSubsystemVersion: properties.MajorSubsystemVersion,
minorSubsystemVersion: properties.MinorSubsystemVersion,
subsystem: properties.Subsystem,
dllCharacteristics: properties.DllCharacteristics,
imageCharacteristics: properties.ImageCharacteristics,
sizeOfStackReserve: properties.SizeOfStackReserve,
sizeOfStackCommit: properties.SizeOfStackCommit,
sizeOfHeapReserve: properties.SizeOfHeapReserve,
sizeOfHeapCommit: properties.SizeOfHeapCommit);
var peIdProvider = isDeterministic ?
new Func<IEnumerable<Blob>, BlobContentId>(content => BlobContentId.FromHash(CryptographicHashProvider.ComputeSourceHash(content))) :
null;
// We need to calculate the PDB checksum, so we may as well use the calculated hash for PDB ID regardless of whether deterministic build is requested.
var portablePdbContentHash = default(ImmutableArray<byte>);
PooledBlobBuilder? portablePdbToEmbed = null;
if (mdWriter.EmitPortableDebugMetadata)
{
mdWriter.AddRemainingDebugDocuments(mdWriter.Module.DebugDocumentsBuilder.DebugDocuments);
// The algorithm must be specified for deterministic builds (checked earlier).
Debug.Assert(!isDeterministic || context.Module.PdbChecksumAlgorithm.Name != null);
var portablePdbIdProvider = (context.Module.PdbChecksumAlgorithm.Name != null) ?
new Func<IEnumerable<Blob>, BlobContentId>(content => BlobContentId.FromHash(portablePdbContentHash = CryptographicHashProvider.ComputeHash(context.Module.PdbChecksumAlgorithm, content))) :
null;
emitBuilders.PortablePdbBlobBuilder = PooledBlobBuilder.GetInstance(zero: true);
var portablePdbBuilder = mdWriter.GetPortablePdbBuilder(metadataRootBuilder.Sizes.RowCounts, debugEntryPointHandle, portablePdbIdProvider);
pdbContentId = portablePdbBuilder.Serialize(emitBuilders.PortablePdbBlobBuilder);
portablePdbVersion = portablePdbBuilder.FormatVersion;
if (getPortablePdbStreamOpt == null)
{
// embed to debug directory:
portablePdbToEmbed = emitBuilders.PortablePdbBlobBuilder;
}
else
{
// write to Portable PDB stream:
Stream? portablePdbStream = getPortablePdbStreamOpt();
if (portablePdbStream != null)
{
try
{
emitBuilders.PortablePdbBlobBuilder.WriteContentTo(portablePdbStream);
}
catch (Exception e) when (!(e is OperationCanceledException))
{
throw new SymUnmanagedWriterException(e.Message, e);
}
}
}
}
DebugDirectoryBuilder? debugDirectoryBuilder;
if (pdbPathOpt != null || isDeterministic || portablePdbToEmbed != null)
{
debugDirectoryBuilder = new DebugDirectoryBuilder();
if (pdbPathOpt != null)
{
string paddedPath = isDeterministic ? pdbPathOpt : PadPdbPath(pdbPathOpt);
debugDirectoryBuilder.AddCodeViewEntry(paddedPath, pdbContentId, portablePdbVersion);
if (!portablePdbContentHash.IsDefault)
{
// Emit PDB Checksum entry for Portable and Embedded PDBs. The checksum is not as useful when the PDB is embedded,
// however it allows the client to efficiently validate a standalone Portable PDB that
// has been extracted from Embedded PDB and placed next to the PE file.
debugDirectoryBuilder.AddPdbChecksumEntry(context.Module.PdbChecksumAlgorithm.Name!, portablePdbContentHash);
}
}
if (isDeterministic)
{
debugDirectoryBuilder.AddReproducibleEntry();
}
if (portablePdbToEmbed != null)
{
debugDirectoryBuilder.AddEmbeddedPortablePdbEntry(portablePdbToEmbed, portablePdbVersion);
}
}
else
{
debugDirectoryBuilder = null;
}
var strongNameProvider = context.Module.CommonCompilation.Options.StrongNameProvider;
var corFlags = properties.CorFlags;
var peBuilder = new ExtendedPEBuilder(
peHeaderBuilder,
metadataRootBuilder,
emitBuilders.IlBlobBuilder,
emitBuilders.MappedFieldDataBlobBuilder,
emitBuilders.ManagedResourceBlobBuilder,
CreateNativeResourceSectionSerializer(context.Module),
debugDirectoryBuilder,
CalculateStrongNameSignatureSize(context.Module, privateKeyOpt),
entryPointHandle,
corFlags,
peIdProvider,
metadataOnly && !context.IncludePrivateMembers);
// This needs to force the backing builder to zero due to the issue writing COFF
// headers. Can remove once this issue is fixed and we've moved to SRM with the
// fix
// https://github.com/dotnet/runtime/issues/99244
emitBuilders.PortableExecutableBlobBuilder = PooledBlobBuilder.GetInstance(zero: true);
var peContentId = peBuilder.Serialize(emitBuilders.PortableExecutableBlobBuilder, out Blob mvidSectionFixup);
PatchModuleVersionIds(mvidFixup, mvidSectionFixup, mvidStringFixup, peContentId.Guid);
if (privateKeyOpt != null && corFlags.HasFlag(CorFlags.StrongNameSigned))
{
Debug.Assert(strongNameProvider != null);
strongNameProvider.SignBuilder(peBuilder, emitBuilders.PortableExecutableBlobBuilder, privateKeyOpt.Value);
}
try
{
emitBuilders.PortableExecutableBlobBuilder.WriteContentTo(peStream);
}
catch (Exception e) when (!(e is OperationCanceledException))
{
throw new PeWritingException(e);
}
return true;
}
finally
{
emitBuilders.Free();
}
}
private static MethodInfo? s_calculateChecksumMethod;
// internal for testing
internal static uint CalculateChecksum(BlobBuilder peBlob, Blob checksumBlob)
{
if (s_calculateChecksumMethod == null)
{
s_calculateChecksumMethod = typeof(PEBuilder).GetRuntimeMethods()
.Where(m => m.Name == "CalculateChecksum" && m.GetParameters().Length == 2)
.Single();
}
return (uint)s_calculateChecksumMethod.Invoke(null, new object[]
{
peBlob,
checksumBlob,
})!;
}
private static void PatchModuleVersionIds(Blob guidFixup, Blob guidSectionFixup, Blob stringFixup, Guid mvid)
{
if (!guidFixup.IsDefault)
{
var writer = new BlobWriter(guidFixup);
writer.WriteGuid(mvid);
Debug.Assert(writer.RemainingBytes == 0);
}
if (!guidSectionFixup.IsDefault)
{
var writer = new BlobWriter(guidSectionFixup);
writer.WriteGuid(mvid);
Debug.Assert(writer.RemainingBytes == 0);
}
if (!stringFixup.IsDefault)
{
var writer = new BlobWriter(stringFixup);
writer.WriteUserString(mvid.ToString());
Debug.Assert(writer.RemainingBytes == 0);
}
}
// Padding: We pad the path to this minimal size to
// allow some tools to patch the path without the need to rewrite the entire image.
// This is a workaround put in place until these tools are retired.
private static string PadPdbPath(string path)
{
const int minLength = 260;
return path + new string('\0', Math.Max(0, minLength - Encoding.UTF8.GetByteCount(path) - 1));
}
private static ResourceSectionBuilder? CreateNativeResourceSectionSerializer(CommonPEModuleBuilder module)
{
// Win32 resources are supplied to the compiler in one of two forms, .RES (the output of the resource compiler),
// or .OBJ (the output of running cvtres.exe on a .RES file). A .RES file is parsed and processed into
// a set of objects implementing IWin32Resources. These are then ordered and the final image form is constructed
// and written to the resource section. Resources in .OBJ form are already very close to their final output
// form. Rather than reading them and parsing them into a set of objects similar to those produced by
// processing a .RES file, we process them like the native linker would, copy the relevant sections from
// the .OBJ into our output and apply some fixups.
var nativeResourceSectionOpt = module.Win32ResourceSection;
if (nativeResourceSectionOpt != null)
{
return new ResourceSectionBuilderFromObj(nativeResourceSectionOpt);
}
var nativeResourcesOpt = module.Win32Resources;
if (nativeResourcesOpt?.Any() == true)
{
return new ResourceSectionBuilderFromResources(nativeResourcesOpt);
}
var rawResourcesOpt = module.RawWin32Resources;
if (rawResourcesOpt != null)
{
return new ResourceSectionBuilderFromRaw(rawResourcesOpt);
}
return null;
}
private sealed class ResourceSectionBuilderFromObj : ResourceSectionBuilder
{
private readonly ResourceSection _resourceSection;
public ResourceSectionBuilderFromObj(ResourceSection resourceSection)
{
Debug.Assert(resourceSection != null);
_resourceSection = resourceSection;
}
protected override void Serialize(BlobBuilder builder, SectionLocation location)
{
NativeResourceWriter.SerializeWin32Resources(builder, _resourceSection, location.RelativeVirtualAddress);
}
}
private sealed class ResourceSectionBuilderFromResources : ResourceSectionBuilder
{
private readonly IEnumerable<IWin32Resource> _resources;
public ResourceSectionBuilderFromResources(IEnumerable<IWin32Resource> resources)
{
Debug.Assert(resources.Any());
_resources = resources;
}
protected override void Serialize(BlobBuilder builder, SectionLocation location)
{
NativeResourceWriter.SerializeWin32Resources(builder, _resources, location.RelativeVirtualAddress);
}
}
private sealed class ResourceSectionBuilderFromRaw : ResourceSectionBuilder
{
private readonly Stream _resources;
public ResourceSectionBuilderFromRaw(Stream resources)
{
_resources = resources;
}
protected override void Serialize(BlobBuilder builder, SectionLocation location)
{
int value;
while ((value = _resources.ReadByte()) >= 0)
{
builder.WriteByte((byte)value);
}
}
}
}
}
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