Support for producing SourceMap on emit (#2707)

* #include an absolute path didn't work - because paths were taken to always be relative.

* WIP source map.

* Split out handling of RttiTypeFuncs to a map type.

* Make RttiTypeFuncsMap hold default impls.

* Slightly more sophisticated RttiTypeFuncsMap

* Source map decoding.

* Fix tabs.

* Fix asserts due to negative values.

* Use less obscure mechanisms in SourceMap.

* Source map decoding.
Simplifying SourceMap usage.

* First attempt at ouputting a source map as part of emit.

* Added support for -source-map option. SourceMap is added to the artifact.

1 files changed, 37 insertions, 1 deletions

diff --git a/source/slang/slang-emit.cpp b/source/slang/slang-emit.cpp
index a25fae5ae..335e95c9e 100644
--- a/source/slang/slang-emit.cpp
+++ b/source/slang/slang-emit.cpp
@@ -935,7 +935,15 @@ SlangResult CodeGenContext::emitEntryPointsSourceFromIR(ComPtr<IArtifact>& outAr
         lineDirectiveMode = LineDirectiveMode::GLSL;
     }
 
-    SourceWriter sourceWriter(sourceManager, lineDirectiveMode );
+    RefPtr<SourceMap> sourceMap;
+
+    // If SourceMap is enabled, we create one and associate it with the sourceWriter
+    if (targetRequest->getLinkage()->m_generateSourceMap)
+    {
+        sourceMap = new SourceMap;
+    }
+
+    SourceWriter sourceWriter(sourceManager, lineDirectiveMode, sourceMap );
 
     CLikeSourceEmitter::Desc desc;
 
@@ -1096,6 +1104,34 @@ SlangResult CodeGenContext::emitEntryPointsSourceFromIR(ComPtr<IArtifact>& outAr
         artifact->addAssociated(metadata);
     }
 
+    if (sourceMap)
+    {
+        SourceManager sourceMapSourceManager;
+        sourceMapSourceManager.initialize(nullptr, nullptr);
+
+        // Create a sink
+        DiagnosticSink sourceMapSink(&sourceMapSourceManager, nullptr);
+
+        // Turn into JSON
+        RefPtr<JSONContainer> jsonContainer(new JSONContainer(&sourceMapSourceManager));
+
+        JSONValue jsonValue;
+        SLANG_RETURN_ON_FAIL(sourceMap->encode(jsonContainer, &sourceMapSink, jsonValue));
+
+        // Okay now convert this into a text file and then a blob
+
+        // Convert into a string
+        JSONWriter writer(JSONWriter::IndentationStyle::KNR);
+        jsonContainer->traverseRecursively(jsonValue, &writer);
+
+        auto sourceMapBlob = StringBlob::moveCreate(writer.getBuilder());
+
+        auto sourceMapArtifact = ArtifactUtil::createArtifact(ArtifactDesc::make(ArtifactKind::Text, ArtifactPayload::SourceMap, ArtifactStyle::None));
+        sourceMapArtifact->addRepresentationUnknown(sourceMapBlob);
+
+        artifact->addAssociated(sourceMapArtifact);
+    }
+
     outArtifact.swap(artifact);
     return SLANG_OK;
 }