Add -dump-module command to slangc (#6638)

* Add -dump-module command to slangc

The new -dump-module command to slangc will load and disassemble a slang module, similar to what would be seen by the -dump-ir command, except that -dump-ir tells slangc to print IR as it performs some compilation command. That is, -dump-ir requires
some larger compilation task.

-dump-module on the otherhand requires no additional goal and will simply load a module and print its IR to stdout independently from other compilation steps.

Its intended purpose is to inspect .slang-module files on disk.
It can also be used on .slang files which will be parsed and lowered
if slang does not find an associated ".slang-module" version of the
module on disk.

The compilation API is extended with a new IModule::disassemble()
method which retrieves the string representation of the dumped IR.

Closes #6599

* format code

* Use FileStream not FILE

* format code

---------

Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>
Co-authored-by: Ellie Hermaszewska <ellieh@nvidia.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/source/slang/slang-compiler.h b/source/slang/slang-compiler.h
index cfcbe816f..d4e05bc48 100644
--- a/source/slang/slang-compiler.h
+++ b/source/slang/slang-compiler.h
@@ -1832,6 +1832,18 @@ private:
 
     // Source files that have been pulled into the module with `__include`.
     Dictionary<SourceFile*, FileDecl*> m_mapSourceFileToFileDecl;
+
+public:
+    SLANG_NO_THROW SlangResult SLANG_MCALL disassemble(slang::IBlob** outDisassembledBlob) override
+    {
+        if (!outDisassembledBlob)
+            return SLANG_E_INVALID_ARG;
+        String disassembly;
+        this->getIRModule()->getModuleInst()->dump(disassembly);
+        auto blob = StringUtil::createStringBlob(disassembly);
+        *outDisassembledBlob = blob.detach();
+        return SLANG_OK;
+    }
 };
 typedef Module LoadedModule;