From 391227ea7b7ef6ea0305733b0871b62f1a46678f Mon Sep 17 00:00:00 2001
From: Jake Turner <jake@evansturner.co.uk>
Date: Wed, 23 Sep 2026 12:53:06 +0100
Subject: [PATCH] Add DXIL bitstream parsing support for LEXICAL_BLOCK_FILE

---
 renderdoc/driver/shaders/dxil/dxil_bytecode.h |  1 +
 .../driver/shaders/dxil/dxil_debuginfo.cpp    | 23 +++++++++++++++++++
 .../driver/shaders/dxil/dxil_debuginfo.h      | 15 ++++++++++++
 3 files changed, 39 insertions(+)

diff --git a/renderdoc/driver/shaders/dxil/dxil_bytecode.h b/renderdoc/driver/shaders/dxil/dxil_bytecode.h
index 68007bf13..61a66c02e 100644
--- a/renderdoc/driver/shaders/dxil/dxil_bytecode.h
+++ b/renderdoc/driver/shaders/dxil/dxil_bytecode.h
@@ -1236,6 +1236,7 @@ struct DIBase
     LocalVariable,
     Expression,
     LexicalBlock,
+    LexicalBlockFile,
     Subrange,
     Namespace,
     ImportedEntity,
diff --git a/renderdoc/driver/shaders/dxil/dxil_debuginfo.cpp b/renderdoc/driver/shaders/dxil/dxil_debuginfo.cpp
index 211f2f724..0cc7f046b 100644
--- a/renderdoc/driver/shaders/dxil/dxil_debuginfo.cpp
+++ b/renderdoc/driver/shaders/dxil/dxil_debuginfo.cpp
@@ -274,6 +274,15 @@ bool Program::ParseDebugMetaRecord(MetadataList &metadata, const LLVMBC::BlockOr
 
     meta.dwarf = expr;
   }
+  else if(id == LLVMBC::MetaDataRecord::LEXICAL_BLOCK_FILE)
+  {
+    meta.isDistinct = (metaRecord.ops[0] & 0x1);
+
+    meta.dwarf = new DILexicalBlockFile(metadata.getOrNULL(metaRecord.ops[1]),
+                                        metadata.getOrNULL(metaRecord.ops[2]), metaRecord.ops[3]);
+
+    meta.children = {metadata.getOrNULL(metaRecord.ops[1]), metadata.getOrNULL(metaRecord.ops[2])};
+  }
   else
   {
     return false;
@@ -732,6 +741,20 @@ rdcstr DILexicalBlock::toString(bool dxcStyleFormatting) const
   return ret;
 }
 
+rdcstr DILexicalBlockFile::toString(bool dxcStyleFormatting) const
+{
+  rdcstr ret = "!DILexicalBlockFile(";
+  if(scope)
+    ret += StringFormat::Fmt("scope: %s", scope->refString(dxcStyleFormatting).c_str());
+  else
+    ret += "scope: null";
+  if(file)
+    ret += StringFormat::Fmt(", file: %s", file->refString(dxcStyleFormatting).c_str());
+  ret += StringFormat::Fmt(", discriminator: %llu", discriminator);
+  ret += ")";
+  return ret;
+}
+
 rdcstr DISubrange::toString(bool dxcStyleFormatting) const
 {
   rdcstr ret = "!DISubrange(";
diff --git a/renderdoc/driver/shaders/dxil/dxil_debuginfo.h b/renderdoc/driver/shaders/dxil/dxil_debuginfo.h
index 3c75e63bd..64ba10d05 100644
--- a/renderdoc/driver/shaders/dxil/dxil_debuginfo.h
+++ b/renderdoc/driver/shaders/dxil/dxil_debuginfo.h
@@ -710,6 +710,21 @@ struct DILexicalBlock : public DIBase
   virtual rdcstr toString(bool dxcStyleFormatting) const;
 };
 
+struct DILexicalBlockFile : public DIBase
+{
+  static const DIBase::Type DIType = DIBase::LexicalBlockFile;
+  DILexicalBlockFile(const Metadata *scope, const Metadata *file, uint64_t discriminator)
+      : DIBase(DIType), scope(scope), file(file), discriminator(discriminator)
+  {
+  }
+
+  const Metadata *scope;
+  const Metadata *file;
+  uint64_t discriminator;
+
+  virtual rdcstr toString(bool dxcStyleFormatting) const;
+};
+
 struct DISubrange : public DIBase
 {
   static const DIBase::Type DIType = DIBase::Subrange;