Method CompileFunction

sdk/angelscript/source/as_compiler.cpp:756–970

Entry

// Entry
int asCCompiler::CompileFunction(asCBuilder *in_builder, asCScriptCode *in_script, asCArray<asCString> &in_parameterNames, asCScriptNode *in_func, asCScriptFunction *in_outFunc, sClassDeclaration *in_classDecl)
{
	TimeIt("asCCompiler::CompileFunction");

	Reset(in_builder, in_script, in_outFunc);
	int buildErrors = builder->numErrors;

	int stackPos = SetupParametersAndReturnVariable(in_parameterNames, in_func);

	// If there are compile errors, there is no reason to build the final code
	if (hasCompileErrors || builder->numErrors != buildErrors)
		return -1;

	//--------------------------------------------
	// Compile the statement block

	if( m_isConstructor )
		m_classDecl = in_classDecl;

	// We need to parse the statement block now
	asCScriptNode *blockBegin;

	// If the function signature was implicit, e.g. virtual property accessor or
	// lambda function, then the received node already is the statement block
	if( in_func->nodeType != snStatementBlock )
		blockBegin = in_func->lastChild;
	else
		blockBegin = in_func;

	// TODO: memory: We can parse the statement block one statement at a time, thus save even more memory
	// TODO: optimize: For large functions, the parsing of the statement block can take a long time. Presumably because a lot of memory needs to be allocated
	asCParser parser(builder);
	int r = parser.ParseStatementBlock(script, blockBegin);
	if( r < 0 ) return -1;
	asCScriptNode *block = parser.GetScriptNode();

	// Reserve a label for the cleanup code
	nextLabel++;

	bool hasReturn;
	asCByteCode bc(engine);
	LineInstr(&bc, blockBegin->tokenPos);
	CompileStatementBlock(block, false, &hasReturn, &bc);
	LineInstr(&bc, blockBegin->tokenPos + blockBegin->tokenLength);

	// Make sure there is a return in all paths (if not return type is void)
	// Don't bother with this check if there are compiler errors, e.g. Unreachable code
	if( !hasCompileErrors && outFunc->returnType != asCDataType::CreatePrimitive(ttVoid, false) )
	{
		if( hasReturn == false )
			Error(TXT_NOT_ALL_PATHS_RETURN, blockBegin);
	}

	//------------------------------------------------
	// Concatenate the bytecode

	// Insert a JitEntry at the start of the function for JIT compilers
	byteCode.InstrPTR(asBC_JitEntry, 0);