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, 14 insertions, 5 deletions

diff --git a/source/slang/slang-ir.cpp b/source/slang/slang-ir.cpp
index 92e51fe3b..6d1d76afc 100644
--- a/source/slang/slang-ir.cpp
+++ b/source/slang/slang-ir.cpp
@@ -8950,24 +8950,33 @@ void IRInst::addBlock(IRBlock* block)
     block->insertAtEnd(this);
 }
 
-void IRInst::dump()
+void IRInst::dump(String& outStr)
 {
+    StringBuilder sb;
+
     if (auto intLit = as<IRIntLit>(this))
     {
-        std::cout << intLit->getValue() << std::endl;
+        sb << intLit->getValue();
     }
     else if (auto stringLit = as<IRStringLit>(this))
     {
-        std::cout << stringLit->getStringSlice().begin() << std::endl;
+        sb << stringLit->getStringSlice();
     }
     else
     {
-        StringBuilder sb;
         IRDumpOptions options;
         StringWriter writer(&sb, Slang::WriterFlag::AutoFlush);
         dumpIR(this, options, nullptr, &writer);
-        std::cout << sb.toString().begin() << std::endl;
     }
+
+    outStr = sb.toString();
+}
+
+void IRInst::dump()
+{
+    String s;
+    dump(s);
+    std::cout << s.begin() << std::endl;
 }
 } // namespace Slang