Source map obfuscation (#2717)

* #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.

* Small improvements around column calculation in SourceWriter.

* Source Loc obuscation WIP.

* Fix some issues around SourceMap obfuscation.

* Split out obfuscation into its own file.

* Keep obfuscated SourceMap even through serialization bottleneck.

1 files changed, 21 insertions, 2 deletions

diff --git a/source/slang/slang-lower-to-ir.cpp b/source/slang/slang-lower-to-ir.cpp
index 86df89702..f84f17886 100644
--- a/source/slang/slang-lower-to-ir.cpp
+++ b/source/slang/slang-lower-to-ir.cpp
@@ -3,6 +3,10 @@
 
 #include "../../slang.h"
 
+#include "../core/slang-random-generator.h"
+#include "../core/slang-hash.h"
+#include "../core/slang-char-util.h"
+
 #include "slang-check.h"
 #include "slang-ir.h"
 #include "slang-ir-constexpr.h"
@@ -21,6 +25,8 @@
 #include "slang-ir-string-hash.h"
 #include "slang-ir-clone.h"
 #include "slang-ir-lower-error-handling.h"
+#include "slang-ir-obfuscate-loc.h"
+
 #include "slang-mangle.h"
 #include "slang-type-layout.h"
 #include "slang-visitor.h"
@@ -9299,10 +9305,17 @@ RefPtr<IRModule> generateIRForTranslationUnit(
         Linkage* linkage = compileRequest->getLinkage();
 
         stripOptions.shouldStripNameHints = linkage->m_obfuscateCode;
-        stripOptions.stripSourceLocs = linkage->m_obfuscateCode;
 
+        // If we are generating an obfuscated source map, we don't want to strip locs, 
+        // we want to generate *new* locs that can be mapped (via source map)
+        // back to *actual* source.
+        // 
+        // We don't do the obfuscation remapping here, because DCE and other passes may 
+        // change what locs are actually needed, we need to be sure 
+        // that if we have obfuscation enabled we don't forget to obfuscate.
+        stripOptions.stripSourceLocs = linkage->m_obfuscateCode && !linkage->m_generateSourceMap;
         stripFrontEndOnlyInstructions(module, stripOptions);
-
+    
         // Stripping out decorations could leave some dead code behind
         // in the module, and in some cases that extra code is also
         // undesirable (e.g., the string literals referenced by name-hint
@@ -9314,6 +9327,12 @@ RefPtr<IRModule> generateIRForTranslationUnit(
         IRDeadCodeEliminationOptions options;
         options.keepExportsAlive = true;
         eliminateDeadCode(module, options);
+
+        if (linkage->m_obfuscateCode && linkage->m_generateSourceMap)
+        {
+            // The obfuscated source map is stored on the module
+            obfuscateModuleLocs(module, compileRequest->getSourceManager());
+        }
     }
 
     // TODO: consider doing some more aggressive optimizations