Add command line option for separate debug info (#7178)

* Add command line option for separate debug info

Add command line arg -separate-debug-info which, if provided, produces
both a .spv and a .dbg.spv file. The .dbg.spv file contains full debug
info and the .spv file has all debug info stripped out.

Also add a DebugBuildIdentifier instruction to store a unique hash in
both the output files, so they can be more easily matched together.

A matching API is provided to allow using the Slang API to retrieve a
base and debug SPIRV as well as the debug build identifier string.

1 files changed, 5 insertions, 0 deletions

diff --git a/source/slang/slang-ir-link.cpp b/source/slang/slang-ir-link.cpp
index 29a42b73c..a7b4c4560 100644
--- a/source/slang/slang-ir-link.cpp
+++ b/source/slang/slang-ir-link.cpp
@@ -2174,6 +2174,11 @@ LinkedIR linkIR(CodeGenContext* codeGenContext)
                 // regardless if the source files participate in the line table or not.
                 cloneValue(context, inst);
                 break;
+            case kIROp_DebugBuildIdentifier:
+                // The debug build identifier won't be referenced by anything,
+                // but we still need to keep it around if it is in the IR.
+                cloneValue(context, inst);
+                break;
             }
         }
     }