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// main.cpp
// This file implements the entry point for `slangi`, an interpreter for the Slang language.
#include "../../source/core/slang-basic.h"
#include "core/slang-io.h"
#include "slang-com-ptr.h"
#include "slang.h"
using namespace Slang;
using namespace slang;
void printUsage()
{
printf("Slang Interpreter (Experimental)\n");
printf("Compile and interpret Slang code.\n");
printf("Usage: slangi [options] <filename>\n");
printf("Options:\n");
printf(" -entry <name> Specify the entry point function name to run. (default: main)\n");
printf(" -disasm Disassemble the bytecode after compilation.\n");
printf(" -help Show this help message\n");
}
void maybePrintDiagnostic(const ComPtr<slang::IBlob>& diagnosticBlob)
{
if (diagnosticBlob)
{
const char* diagText = (const char*)diagnosticBlob->getBufferPointer();
fprintf(stderr, "%s\n", diagText);
}
}
SlangResult compileAndInterpret(
UnownedStringSlice fileName,
const char* entryPointName,
bool disasm,
int argc,
const char* const* argv)
{
ComPtr<slang::IGlobalSession> globalSession;
SLANG_RETURN_ON_FAIL(slang_createGlobalSession(SLANG_API_VERSION, globalSession.writeRef()));
slang::TargetDesc targetDesc = {};
targetDesc.format = SLANG_HOST_VM;
slang::SessionDesc sessionDesc = {};
sessionDesc.targetCount = 1;
sessionDesc.targets = &targetDesc;
sessionDesc.compilerOptionEntryCount = 0;
String pathName = Path::getParentDirectory(fileName);
String moduleName = Path::getFileNameWithoutExt(fileName);
const char* searchPaths[] = {pathName.getBuffer()};
if (pathName.getLength())
{
sessionDesc.searchPathCount = 1;
sessionDesc.searchPaths = searchPaths;
}
ComPtr<slang::ISession> session;
SLANG_RETURN_ON_FAIL(globalSession->createSession(sessionDesc, session.writeRef()));
ComPtr<slang::IBlob> diagnosticBlob;
auto module = session->loadModule(moduleName.getBuffer(), diagnosticBlob.writeRef());
if (!module)
{
maybePrintDiagnostic(diagnosticBlob);
return SLANG_FAIL;
}
ComPtr<slang::IEntryPoint> entryPoint;
if (SLANG_FAILED(module->findAndCheckEntryPoint(
entryPointName,
SLANG_STAGE_DISPATCH,
entryPoint.writeRef(),
diagnosticBlob.writeRef())))
{
maybePrintDiagnostic(diagnosticBlob);
return SLANG_FAIL;
}
ComPtr<slang::IComponentType> compositeComponent;
slang::IComponentType* components[] = {module, entryPoint.get()};
if (SLANG_FAILED(session->createCompositeComponentType(
components,
2,
compositeComponent.writeRef(),
diagnosticBlob.writeRef())))
{
maybePrintDiagnostic(diagnosticBlob);
return SLANG_FAIL;
}
ComPtr<slang::IComponentType> linkedProgram;
if (SLANG_FAILED(compositeComponent->link(linkedProgram.writeRef(), diagnosticBlob.writeRef())))
{
maybePrintDiagnostic(diagnosticBlob);
return SLANG_FAIL;
}
ComPtr<slang::IBlob> code;
if (SLANG_FAILED(linkedProgram->getTargetCode(0, code.writeRef(), diagnosticBlob.writeRef())))
{
maybePrintDiagnostic(diagnosticBlob);
return SLANG_FAIL;
}
if (code->getBufferSize() == 0)
{
return SLANG_FAIL;
}
if (disasm)
{
ComPtr<slang::IBlob> disasmBlob;
if (SLANG_FAILED(slang_disassembleByteCode(code, disasmBlob.writeRef())))
{
maybePrintDiagnostic(diagnosticBlob);
return SLANG_FAIL;
}
const char* disasmText = (const char*)disasmBlob->getBufferPointer();
printf("%s\n", disasmText);
}
// Create a byte code runner and interpret the code.
ComPtr<slang::IByteCodeRunner> runner;
slang::ByteCodeRunnerDesc runnerDesc = {};
SLANG_RETURN_ON_FAIL(slang_createByteCodeRunner(&runnerDesc, runner.writeRef()));
if (SLANG_FAILED(runner->loadModule(code)))
{
runner->getErrorString(diagnosticBlob.writeRef());
maybePrintDiagnostic(diagnosticBlob);
}
auto funcIndex = runner->findFunctionByName(entryPointName);
if (funcIndex < 0)
{
printf("Function '%s' not found in byte code.\n", entryPointName);
return SLANG_FAIL;
}
if (SLANG_FAILED(runner->selectFunctionByIndex((uint32_t)funcIndex)))
{
runner->getErrorString(diagnosticBlob.writeRef());
maybePrintDiagnostic(diagnosticBlob);
return SLANG_FAIL;
}
struct Arguments
{
uint32_t argc;
const char* const* argv;
};
Arguments args;
args.argc = argc;
args.argv = argv;
void* arguments = nullptr;
size_t argSize = 0;
slang::ByteCodeFuncInfo funcInfo;
if (SLANG_FAILED(runner->getFunctionInfo((uint32_t)funcIndex, &funcInfo)))
{
runner->getErrorString(diagnosticBlob.writeRef());
maybePrintDiagnostic(diagnosticBlob);
return SLANG_FAIL;
}
if (funcInfo.parameterCount == 2)
{
arguments = &args;
argSize = sizeof(Arguments);
}
if (SLANG_FAILED(runner->execute(arguments, argSize)))
{
runner->getErrorString(diagnosticBlob.writeRef());
maybePrintDiagnostic(diagnosticBlob);
return SLANG_FAIL;
}
size_t returnValueSize = 0;
void* returnVal = runner->getReturnValue(&returnValueSize);
SlangResult result = SLANG_OK;
memcpy(&result, returnVal, returnValueSize);
return result;
}
int main(int argc, const char* const* argv)
{
String entryPointName = toSlice("main");
UnownedStringSlice fileName;
bool disasm = false;
int innerArgIndex = 0;
if (argc < 2)
{
printUsage();
return 0;
}
for (auto i = 1; i < argc; i++)
{
auto arg = UnownedStringSlice(argv[i]);
if (arg == "-entry")
{
entryPointName = UnownedStringSlice(argv[++i]);
}
else if (arg == "-help" || arg == "--help")
{
printUsage();
return 0;
}
else if (arg == "-disasm")
{
disasm = true;
}
else if (arg.startsWith("-"))
{
fprintf(stderr, "Unknown option: %s\n", arg.begin());
printUsage();
return -1;
}
else
{
fileName = arg;
innerArgIndex = i;
break;
}
}
if (!fileName.getLength())
{
printUsage();
return 0;
}
auto result = compileAndInterpret(
fileName,
entryPointName.getBuffer(),
disasm,
argc - innerArgIndex,
argv + innerArgIndex);
slang::shutdown();
return result;
}
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