Round trip source map (#2810)

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

* Make output of obfuscation locs work in a slang-module.

* Tidy up detection for writing serialized source locs.

* Support for .zip references.
Handling of obfuscated source maps read from containers.
A test to check obfuscated source map working on a module.

* When using obfuscation, always obfuscate locs instead of stripping them. We keep a source map, so we can still produce reasonable errors.

* Write out source locs if debug information is enabled.

* Check output without sourcemap.

* Small fixes.

* Small improvements around hash calculation for source map name.

* Disable test that fails on x86 gcc linux for now.

* Fix issues around obfuscated source map using lines rather than columns.
Fix some issues around encoding/decoding.

* Make column calculation of source locs take into account utf8/tabs.
Don't special case obfuscated source map for lookup for source loc.

* Support following multiple source maps.

* Small fixes/improvements around SourceMap lookup.

1 files changed, 18 insertions, 2 deletions

diff --git a/source/slang/slang-compiler.cpp b/source/slang/slang-compiler.cpp
index 43a6d238e..becd65596 100644
--- a/source/slang/slang-compiler.cpp
+++ b/source/slang/slang-compiler.cpp
@@ -1812,6 +1812,19 @@ namespace Slang
     }
 
     
+    bool _shouldWriteSourceLocs(Linkage* linkage)
+    {
+        // If debug information or source manager are not avaiable we can't/shouldn't write out locs
+        if (linkage->debugInfoLevel == DebugInfoLevel::None || 
+            linkage->getSourceManager() == nullptr)
+        {
+            return false;
+        }
+        
+        // Otherwise we do want to write out the locs
+        return true;
+    }
+
     SlangResult EndToEndCompileRequest::writeContainerToStream(Stream* stream)
     {
         auto linkage = getLinkage();
@@ -1827,7 +1840,9 @@ namespace Slang
             // Also currently only IR is needed.
             options.optionFlags &= ~SerialOptionFlag::ASTModule;
         }
-        else if (linkage->debugInfoLevel != DebugInfoLevel::None && linkage->getSourceManager())
+        
+        // If debug information is enabled, enable writing out source locs
+        if (_shouldWriteSourceLocs(linkage))
         {
             options.optionFlags |= SerialOptionFlag::SourceLocation;
             options.sourceManager = linkage->getSourceManager();
@@ -1897,7 +1912,8 @@ namespace Slang
 
             auto sourceMap = translationUnit->getModule()->getIRModule()->getObfuscatedSourceMap();
 
-            if (sourceMap)
+            // If we have a source map *and* we want to generate them for output add to the container
+            if (sourceMap && getLinkage()->m_generateSourceMap)
             {
                 // Write it out
                 String json;