X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;ds=sidebyside;f=Usermode%2FLibraries%2Flibspiderscript.so_src%2Fexec_ast.c;h=d4c7995f14f5b7b23abf8265efbeb891ac4c6f1a;hb=239f2374299c1471a40b1087725b32f3f163d9b3;hp=90045bca6027cc6bd63423a6c82b4f12ed73c763;hpb=efa38e0d56b1b620b6f4e5c4f91abc483a3065e2;p=tpg%2Facess2.git diff --git a/Usermode/Libraries/libspiderscript.so_src/exec_ast.c b/Usermode/Libraries/libspiderscript.so_src/exec_ast.c index 90045bca..d4c7995f 100644 --- a/Usermode/Libraries/libspiderscript.so_src/exec_ast.c +++ b/Usermode/Libraries/libspiderscript.so_src/exec_ast.c @@ -1,255 +1,907 @@ /* + * SpiderScript Library + * + * AST Execution */ #include #include +#include #include +#include "common.h" #include "ast.h" -#define ERRPTR ((void*)((intptr_t)0-1)) +#define TRACE_VAR_LOOKUPS 0 +#define TRACE_NODE_RETURNS 0 + +// === IMPORTS === +extern tSpiderFunction *gpExports_First; // === PROTOTYPES === -void Object_Dereference(tSpiderVariable *Object); -void Object_Reference(tSpiderVariable *Object); -tSpiderVariable *Object_CreateInteger(uint64_t Value); -tSpiderVariable *Object_CreateReal(double Value); -tSpiderVariable *Object_CreateString(int Length, const char *Data); -tSpiderVariable *Object_CastTo(int Type, tSpiderVariable *Source); - int Object_IsTrue(tSpiderVariable *Value); +// - Node Execution +tSpiderValue *AST_ExecuteNode(tAST_BlockState *Block, tAST_Node *Node); +tSpiderValue *AST_ExecuteNode_BinOp(tSpiderScript *Script, tAST_Node *Node, int Operation, tSpiderValue *Left, tSpiderValue *Right); +tSpiderValue *AST_ExecuteNode_UniOp(tSpiderScript *Script, tAST_Node *Node, int Operation, tSpiderValue *Value); +// - Variables +tAST_Variable *Variable_Define(tAST_BlockState *Block, int Type, const char *Name, tSpiderValue *Value); + int Variable_SetValue(tAST_BlockState *Block, tAST_Node *VarNode, tSpiderValue *Value); +tSpiderValue *Variable_GetValue(tAST_BlockState *Block, tAST_Node *VarNode); +void Variable_Destroy(tAST_Variable *Variable); +// - Errors +void AST_RuntimeMessage(tAST_Node *Node, const char *Type, const char *Format, ...); +void AST_RuntimeError(tAST_Node *Node, const char *Format, ...); -void Variable_SetValue(tSpiderScript *Script, const char *Name, tSpiderVariable *Value); -tSpiderVariable *Variable_GetValue(tSpiderScript *Script, const char *Name); +// === GLOBALS === + int giNextBlockIdent = 1; // === CODE === -/** - * \brief Dereference a created object - */ -void Object_Dereference(tSpiderVariable *Object) -{ - Object->ReferenceCount --; - if( Object->ReferenceCount == 0 ) free(Object); -} - -void Object_Reference(tSpiderVariable *Object) +tSpiderValue *AST_ExecuteFunction(tSpiderScript *Script, tScript_Function *Fcn, int NArguments, tSpiderValue **Arguments) { - Object->ReferenceCount ++; -} - -/** - * \brief Create an integer object - */ -tSpiderVariable *Object_CreateInteger(uint64_t Value) -{ - tSpiderVariable *ret = malloc( sizeof(tSpiderVariable) ); - ret->Type = SS_DATATYPE_INTEGER; - ret->ReferenceCount = 1; - ret->Integer = Value; - return ret; -} - -/** - * \brief Create an real number object - */ -tSpiderVariable *Object_CreateReal(double Value) -{ - tSpiderVariable *ret = malloc( sizeof(tSpiderVariable) ); - ret->Type = SS_DATATYPE_REAL; - ret->ReferenceCount = 1; - ret->Real = Value; + tAST_BlockState bs; + tSpiderValue *ret; + int i = 0; + + // Build a block State + bs.FirstVar = NULL; + bs.RetVal = NULL; + bs.Parent = NULL; + bs.BaseNamespace = &Script->Variant->RootNamespace; + bs.CurNamespace = NULL; + bs.Script = Script; + bs.Ident = giNextBlockIdent ++; + + // Parse arguments + for( i = 0; i < Fcn->ArgumentCount; i ++ ) + { + if( i >= NArguments ) break; // TODO: Return gracefully + // TODO: Type checks + Variable_Define(&bs, + Fcn->Arguments[i].Type, Fcn->Arguments[i].Name, + Arguments[i]); + } + + // Execute function + ret = AST_ExecuteNode(&bs, Fcn->ASTFcn); + if(ret != ERRPTR) + { + SpiderScript_DereferenceValue(ret); // Dereference output of last block statement + ret = bs.RetVal; // Set to return value of block + } + + while(bs.FirstVar) + { + tAST_Variable *nextVar = bs.FirstVar->Next; + Variable_Destroy( bs.FirstVar ); + bs.FirstVar = nextVar; + } return ret; } /** - * \brief Create an string object + * \brief Execute a script function + * \param Script Script context to execute in + * \param Namespace Namespace to search for the function + * \param Function Function name to execute + * \param NArguments Number of arguments to pass + * \param Arguments Arguments passed */ -tSpiderVariable *Object_CreateString(int Length, const char *Data) +tSpiderValue *SpiderScript_ExecuteFunction(tSpiderScript *Script, + tSpiderNamespace *Namespace, const char *Function, + int NArguments, tSpiderValue **Arguments) { - tSpiderVariable *ret = malloc( sizeof(tSpiderVariable) + Length + 1 ); - ret->Type = SS_DATATYPE_STRING; - ret->ReferenceCount = 1; - ret->String.Length = Length; - memcpy(ret->String.Data, Data, Length); - ret->String.Data[Length] = '\0'; + int bFound = 0; // Used to keep nesting levels down + tSpiderValue *ret = ERRPTR; + + // First: Find the function in the script + { + tScript_Function *fcn; + for( fcn = Script->Functions; fcn; fcn = fcn->Next ) + { + if( strcmp(fcn->Name, Function) == 0 ) + break; + } + // Execute! + if(fcn) + { + ret = AST_ExecuteFunction(Script, fcn, NArguments, Arguments); + bFound = 1; + } + } + + // Didn't find it in script? + if(!bFound) + { + tSpiderFunction *fcn; + fcn = NULL; // Just to allow the below code to be neat + + // Second: Scan current namespace + if( !fcn && Namespace ) + { + for( fcn = Namespace->Functions; fcn; fcn = fcn->Next ) + { + if( strcmp( fcn->Name, Function ) == 0 ) + break; + } + } + + // Third: Search the variant's global exports + if( !fcn ) + { + for( fcn = Script->Variant->Functions; fcn; fcn = fcn->Next ) + { + if( strcmp( fcn->Name, Function ) == 0 ) + break; + } + } + + // Fourth: Search language exports + if( !fcn ) + { + for( fcn = gpExports_First; fcn; fcn = fcn->Next ) + { + if( strcmp( fcn->Name, Function ) == 0 ) + break; + } + } + + // Execute! + if(fcn) + { + // TODO: Type Checking + ret = fcn->Handler( Script, NArguments, Arguments ); + bFound = 1; + } + } + + // Not found? + if(!bFound) + { + fprintf(stderr, "Undefined reference to function '%s' (ns='%s')\n", + Function, Namespace->Name); + return ERRPTR; + } + return ret; } /** + * \brief Execute an object method function + * \param Script Script context to execute in + * \param Object Object in which to find the method + * \param MethodName Name of method to call + * \param NArguments Number of arguments to pass + * \param Arguments Arguments passed */ -tSpiderVariable *Object_CastTo(int Type, tSpiderVariable *Source) +tSpiderValue *SpiderScript_ExecuteMethod(tSpiderScript *Script, + tSpiderObject *Object, const char *MethodName, + int NArguments, tSpiderValue **Arguments) { - tSpiderVariable *ret; - // Check if anything needs to be done - if( Source->Type == Type ) { - Object_Reference(Source); - return Source; - } + tSpiderFunction *fcn; + tSpiderValue this; + tSpiderValue *newargs[NArguments+1]; + int i; + + // TODO: Support program defined objects - switch(Type) + // Search for the function + for( fcn = Object->Type->Methods; fcn; fcn = fcn->Next ) + { + if( strcmp(fcn->Name, MethodName) == 0 ) + break; + } + // Error + if( !fcn ) { - case SS_DATATYPE_UNDEF: - case SS_DATATYPE_NULL: - case SS_DATATYPE_ARRAY: - fprintf(stderr, "Object_CastTo - Invalid cast to %i\n", Type); + AST_RuntimeError(NULL, "Class '%s' does not have a method '%s'", + Object->Type->Name, MethodName); return ERRPTR; + } - case SS_DATATYPE_INTEGER: - ret = malloc(sizeof(tSpiderVariable)); - ret->Type = SS_DATATYPE_INTEGER; - ret->ReferenceCount = 1; - switch(Source->Type) - { - case SS_DATATYPE_INTEGER: break; // Handled above - case SS_DATATYPE_STRING: ret->Integer = atoi(Source->String.Data); break; - case SS_DATATYPE_REAL: ret->Integer = Source->Real; break; - default: - fprintf(stderr, "Object_CastTo - Invalid cast from %i\n", Source->Type); - break; + // Create the "this" argument + this.Type = SS_DATATYPE_OBJECT; + this.ReferenceCount = 1; + this.Object = Object; + newargs[0] = &this; + memcpy(&newargs[1], Arguments, NArguments*sizeof(tSpiderValue*)); + + // Check the type of the arguments + for( i = 0; fcn->ArgTypes[i]; i ++ ) + { + if( i >= NArguments ) { + for( ; fcn->ArgTypes[i]; i ++ ) ; + AST_RuntimeError(NULL, "Argument count mismatch (%i passed, %i expected)", + NArguments, i); + return ERRPTR; + } + if( Arguments[i] && Arguments[i]->Type != fcn->ArgTypes[i] ) + { + AST_RuntimeError(NULL, "Argument type mismatch (%i, expected %i)", + Arguments[i]->Type, fcn->ArgTypes[i]); + return ERRPTR; } - break; } - return ret; + // Call handler + return fcn->Handler(Script, NArguments+1, newargs); } /** - * \brief Condenses a value down to a boolean + * \brief Execute a script function + * \param Script Script context to execute in + * \param Function Function name to execute + * \param NArguments Number of arguments to pass + * \param Arguments Arguments passed */ -int Object_IsTrue(tSpiderVariable *Value) +tSpiderValue *SpiderScript_CreateObject(tSpiderScript *Script, + tSpiderNamespace *Namespace, const char *ClassName, + int NArguments, tSpiderValue **Arguments) { - switch(Value->Type) - { - case SS_DATATYPE_UNDEF: - case SS_DATATYPE_NULL: - return 0; + int bFound = 0; // Used to keep nesting levels down + tSpiderValue *ret = ERRPTR; + tSpiderObjectDef *class; - case SS_DATATYPE_INTEGER: - return !!Value->Integer; - - case SS_DATATYPE_REAL: - return (-.5f < Value->Real && Value->Real < 0.5f); - - case SS_DATATYPE_STRING: - return Value->String.Length > 0; + // First: Find the function in the script + // TODO: Implement script-defined classes + #if 0 + { + tAST_Function *astClass; + for( astClass = Script->Script->Classes; astClass; astClass = astClass->Next ) + { + if( strcmp(astClass->Name, ClassName) == 0 ) + break; + } + // Execute! + if(astClass) + { + tAST_BlockState bs; + tAST_Node *arg; + int i = 0; + + // Build a block State + bs.FirstVar = NULL; + bs.RetVal = NULL; + bs.Parent = NULL; + bs.BaseNamespace = &Script->Variant->RootNamespace; + bs.CurNamespace = NULL; + bs.Script = Script; + bs.Ident = giNextBlockIdent ++; + + for( arg = astFcn->Arguments; arg; arg = arg->NextSibling, i++ ) + { + if( i >= NArguments ) break; // TODO: Return gracefully + // TODO: Type checks + Variable_Define(&bs, + arg->DefVar.DataType, arg->DefVar.Name, + Arguments[i]); + } + + // Execute function + ret = AST_ExecuteNode(&bs, astFcn->Code); + if( ret != ERRPTR ) + { + SpiderScript_DereferenceValue(ret); // Dereference output of last block statement + ret = bs.RetVal; // Set to return value of block + } + bFound = 1; + + while(bs.FirstVar) + { + tAST_Variable *nextVar = bs.FirstVar->Next; + Variable_Destroy( bs.FirstVar ); + bs.FirstVar = nextVar; + } + } + } + #endif - case SS_DATATYPE_OBJECT: - return Value->Object != NULL; + // Didn't find it in script? + if(!bFound) + { + class = NULL; // Just to allow the below code to be neat + + //if( !Namespace ) + // Namespace = &Script->Variant->RootNamespace; + + // Second: Scan current namespace + if( !class && Namespace ) + { + for( class = Namespace->Classes; class; class = class->Next ) + { + if( strcmp( class->Name, ClassName ) == 0 ) + break; + } + } + + #if 0 + // Third: Search the variant's global exports + if( !class ) + { + for( class = Script->Variant->Classes; class; class = fcn->Next ) + { + if( strcmp( class->Name, Function ) == 0 ) + break; + } + } + #endif + + #if 0 + // Fourth: Search language exports + if( !class ) + { + for( class = gpExports_First; class; class = fcn->Next ) + { + if( strcmp( class->Name, ClassName ) == 0 ) + break; + } + } + #endif + + // Execute! + if(class) + { + tSpiderObject *obj; + // TODO: Type Checking + + // Call constructor + obj = class->Constructor( NArguments, Arguments ); + if( obj == NULL || obj == ERRPTR ) + return (void *)obj; + + // Creatue return object + ret = malloc( sizeof(tSpiderValue) ); + ret->Type = SS_DATATYPE_OBJECT; + ret->ReferenceCount = 1; + ret->Object = obj; + bFound = 1; + } + } - case SS_DATATYPE_ARRAY: - return Value->Array.Length > 0; + // Not found? + if(!bFound) + { + fprintf(stderr, "Undefined reference to class '%s'\n", ClassName); + return ERRPTR; } - return 0; + + return ret; } -tSpiderVariable *AST_ExecuteNode(tSpiderScript *Script, tAST_Node *Node) + +/** + * \brief Execute an AST node and return its value + * \param Block Execution context + * \param Node Node to execute + */ +tSpiderValue *AST_ExecuteNode(tAST_BlockState *Block, tAST_Node *Node) { tAST_Node *node; - tSpiderVariable *ret, *tmpvar; - tSpiderVariable *op1, *op2; // Binary operations + tSpiderValue *ret = NULL, *tmpobj; + tSpiderValue *op1, *op2; // Binary operations int cmp; // Used in comparisons + int i; switch(Node->Type) { // No Operation - case NODETYPE_NOP: ret = NULL; break ; + case NODETYPE_NOP: + ret = NULL; + break; // Code block case NODETYPE_BLOCK: - ret = NULL; - for(node = Node->Block.FirstChild; node; node = node->NextSibling ) { - if(node->Type == NODETYPE_RETURN) { - ret = AST_ExecuteNode(Script, node); - break ; + tAST_BlockState blockInfo; + blockInfo.Parent = Block; + blockInfo.Script = Block->Script; + blockInfo.FirstVar = NULL; + blockInfo.RetVal = NULL; + blockInfo.BaseNamespace = Block->BaseNamespace; + blockInfo.CurNamespace = NULL; + blockInfo.BreakTarget = NULL; + blockInfo.Ident = giNextBlockIdent ++; + ret = NULL; + // Loop over all nodes, or until the return value is set + for(node = Node->Block.FirstChild; + node && !blockInfo.RetVal && !blockInfo.BreakTarget; + node = node->NextSibling ) + { + ret = AST_ExecuteNode(&blockInfo, node); + if(ret == ERRPTR) break; // Error check + if(ret != NULL) SpiderScript_DereferenceValue(ret); // Free unused value } - else { - tmpvar = AST_ExecuteNode(Script, node); - if(tmpvar == ERRPTR) return ERRPTR; // Error check - if(tmpvar) Object_Dereference(tmpvar); // Free unused value + // Clean up variables + while(blockInfo.FirstVar) + { + tAST_Variable *nextVar = blockInfo.FirstVar->Next; + Variable_Destroy( blockInfo.FirstVar ); + blockInfo.FirstVar = nextVar; } + // Clear ret if not an error + if(ret != ERRPTR) ret = NULL; + + // Set parent's return value if needed + if( blockInfo.RetVal ) + Block->RetVal = blockInfo.RetVal; + if( blockInfo.BreakTarget ) { + Block->BreakTarget = blockInfo.BreakTarget; + Block->BreakType = blockInfo.BreakType; + } + + // TODO: Unset break if break type deontes a block break } + break; // Assignment case NODETYPE_ASSIGN: + // TODO: Support assigning to object attributes if( Node->Assign.Dest->Type != NODETYPE_VARIABLE ) { - fprintf(stderr, "Syntax error: LVALUE of assignment is not a variable\n"); + AST_RuntimeError(Node, "LVALUE of assignment is not a variable"); + return ERRPTR; + } + ret = AST_ExecuteNode(Block, Node->Assign.Value); + if(ret == ERRPTR) return ERRPTR; + + // Perform assignment operation + if( Node->Assign.Operation != NODETYPE_NOP ) + { + tSpiderValue *varVal, *value; + + varVal = Variable_GetValue(Block, Node->Assign.Dest); + if(varVal == ERRPTR) return ERRPTR; + #if 0 + #else + if(varVal && varVal->ReferenceCount == 2) { + SpiderScript_DereferenceValue(varVal); +// printf("pre: (%s) varVal->ReferenceCount = %i\n", +// Node->Assign.Dest->Variable.Name, +// varVal->ReferenceCount); + } + #endif + value = AST_ExecuteNode_BinOp(Block->Script, Node, Node->Assign.Operation, varVal, ret); + if(value == ERRPTR) return ERRPTR; + + if(ret) SpiderScript_DereferenceValue(ret); + #if 0 + if(varVal) SpiderScript_DereferenceValue(varVal); + #else + if(varVal && varVal->ReferenceCount == 1) { + SpiderScript_ReferenceValue(varVal); +// printf("post: varVal->ReferenceCount = %i\n", varVal->ReferenceCount); + break; // If varVal was non-null, it has been updated by _BinOp + } + #endif + // Else, it was NULL, so has to be assigned + ret = value; + } + + // Set the variable value + if( Variable_SetValue( Block, Node->Assign.Dest, ret ) ) { + SpiderScript_DereferenceValue( ret ); return ERRPTR; } - ret = AST_ExecuteNode(Script, Node->Assign.Value); - // TODO: Apply operation - Variable_SetValue( Script, Node->Assign.Dest->Variable.Name, ret ); break; + // Post increment/decrement + case NODETYPE_POSTINC: + case NODETYPE_POSTDEC: + { + tSpiderValue *varVal, *value; + static tSpiderValue one = { + .Type = SS_DATATYPE_INTEGER, + .ReferenceCount = 1, + {.Integer = 1} + }; + + // TODO: Support assigning to object attributes + if( Node->UniOp.Value->Type != NODETYPE_VARIABLE ) { + AST_RuntimeError(Node, "LVALUE of assignment is not a variable"); + return ERRPTR; + } + + // Get values (current variable contents and a static one) + varVal = Variable_GetValue(Block, Node->UniOp.Value); + + if( Node->Type == NODETYPE_POSTDEC ) + value = AST_ExecuteNode_BinOp(Block->Script, Node, NODETYPE_SUBTRACT, varVal, &one); + else + value = AST_ExecuteNode_BinOp(Block->Script, Node, NODETYPE_ADD, varVal, &one); + if( value == ERRPTR ) + return ERRPTR; + + ret = varVal; + + if( Variable_SetValue( Block, Node->UniOp.Value, value ) ) { + SpiderScript_DereferenceValue( ret ); + return ERRPTR; + } + SpiderScript_DereferenceValue( value ); + } + break; + + // Function Call + case NODETYPE_METHODCALL: case NODETYPE_FUNCTIONCALL: - // TODO: Find a function from the export list in variant - //SpiderScript_ExecuteMethod(Script, Node->FunctionCall.Name - ret = ERRPTR; - fprintf(stderr, "TODO: Implement function calls\n"); + case NODETYPE_CREATEOBJECT: + // Logical block (used to allocate `params`) + { + tSpiderNamespace *ns = Block->CurNamespace; + tSpiderValue *params[Node->FunctionCall.NumArgs]; + i = 0; + for(node = Node->FunctionCall.FirstArg; node; node = node->NextSibling) + { + params[i] = AST_ExecuteNode(Block, node); + if( params[i] == ERRPTR ) { + while(i--) SpiderScript_DereferenceValue(params[i]); + ret = ERRPTR; + goto _return; + } + i ++; + } + + if( !ns ) ns = Block->BaseNamespace; + + // Call the function + if( Node->Type == NODETYPE_CREATEOBJECT ) + { + ret = SpiderScript_CreateObject(Block->Script, + ns, + Node->FunctionCall.Name, + Node->FunctionCall.NumArgs, params + ); + } + else if( Node->Type == NODETYPE_METHODCALL ) + { + tSpiderValue *obj = AST_ExecuteNode(Block, Node->FunctionCall.Object); + if( !obj || obj == ERRPTR || obj->Type != SS_DATATYPE_OBJECT ) { + AST_RuntimeError(Node->FunctionCall.Object, + "Type Mismatch - Required SS_DATATYPE_OBJECT for method call"); + while(i--) SpiderScript_DereferenceValue(params[i]); + ret = ERRPTR; + break; + } + ret = SpiderScript_ExecuteMethod(Block->Script, + obj->Object, Node->FunctionCall.Name, + Node->FunctionCall.NumArgs, params + ); + SpiderScript_DereferenceValue(obj); + } + else + { + ret = SpiderScript_ExecuteFunction(Block->Script, + ns, Node->FunctionCall.Name, + Node->FunctionCall.NumArgs, params + ); + } + + + // Dereference parameters + while(i--) SpiderScript_DereferenceValue(params[i]); + + // falls out + } + break; + + // Conditional + case NODETYPE_IF: + ret = AST_ExecuteNode(Block, Node->If.Condition); + if( ret == ERRPTR ) break; + if( SpiderScript_IsValueTrue(ret) ) { + tmpobj = AST_ExecuteNode(Block, Node->If.True); + } + else { + tmpobj = AST_ExecuteNode(Block, Node->If.False); + } + SpiderScript_DereferenceValue(ret); + if( tmpobj == ERRPTR ) return ERRPTR; + SpiderScript_DereferenceValue(tmpobj); + ret = NULL; + break; + + // Loop + case NODETYPE_LOOP: + // Initialise + ret = AST_ExecuteNode(Block, Node->For.Init); + if(ret == ERRPTR) break; + + // Check initial condition + if( !Node->For.bCheckAfter ) + { + SpiderScript_DereferenceValue(ret); + + ret = AST_ExecuteNode(Block, Node->For.Condition); + if(ret == ERRPTR) return ERRPTR; + if(!SpiderScript_IsValueTrue(ret)) { + SpiderScript_DereferenceValue(ret); + ret = NULL; + break; + } + } + + // Perform loop + for( ;; ) + { + SpiderScript_DereferenceValue(ret); + + // Code + ret = AST_ExecuteNode(Block, Node->For.Code); + if(ret == ERRPTR) return ERRPTR; + SpiderScript_DereferenceValue(ret); + + if(Block->BreakTarget) + { + if( Block->BreakTarget[0] == '\0' || strcmp(Block->BreakTarget, Node->For.Tag) == 0 ) + { + // Ours + free((void*)Block->BreakTarget); Block->BreakTarget = NULL; + if( Block->BreakType == NODETYPE_CONTINUE ) { + // Continue, just keep going + } + else + break; + } + else + break; // Break out of this loop + } + + // Increment + ret = AST_ExecuteNode(Block, Node->For.Increment); + if(ret == ERRPTR) return ERRPTR; + SpiderScript_DereferenceValue(ret); + + // Check condition + ret = AST_ExecuteNode(Block, Node->For.Condition); + if(ret == ERRPTR) return ERRPTR; + if(!SpiderScript_IsValueTrue(ret)) break; + } + SpiderScript_DereferenceValue(ret); + ret = NULL; break; - // Return's special handling happens elsewhere + // Return case NODETYPE_RETURN: - ret = AST_ExecuteNode(Script, Node->UniOp.Value); + ret = AST_ExecuteNode(Block, Node->UniOp.Value); + if(ret == ERRPTR) break; + Block->RetVal = ret; // Return value set + ret = NULL; // the `return` statement does not return a value + break; + + case NODETYPE_BREAK: + case NODETYPE_CONTINUE: + Block->BreakTarget = strdup(Node->Variable.Name); + Block->BreakType = Node->Type; + break; + + // Define a variable + case NODETYPE_DEFVAR: + if( Node->DefVar.InitialValue ) { + tmpobj = AST_ExecuteNode(Block, Node->DefVar.InitialValue); + if(tmpobj == ERRPTR) return ERRPTR; + } + else { + tmpobj = NULL; + } + // TODO: Handle arrays + ret = NULL; + if( Variable_Define(Block, Node->DefVar.DataType, Node->DefVar.Name, tmpobj) == ERRPTR ) + ret = ERRPTR; + SpiderScript_DereferenceValue(tmpobj); + break; + + // Scope + case NODETYPE_SCOPE: + { + tSpiderNamespace *ns; + + // Set current namespace if unset + if( !Block->CurNamespace ) + Block->CurNamespace = Block->BaseNamespace; + + // Empty string means use the root namespace + if( Node->Scope.Name[0] == '\0' ) + { + ns = &Block->Script->Variant->RootNamespace; + } + else + { + // Otherwise scan the current namespace for the element + for( ns = Block->CurNamespace->FirstChild; ns; ns = ns->Next ) + { + if( strcmp(ns->Name, Node->Scope.Name) == 0 ) + break; + } + } + if(!ns) { + AST_RuntimeError(Node, "Unknown namespace '%s'", Node->Scope.Name); + ret = ERRPTR; + break; + } + Block->CurNamespace = ns; + + ret = AST_ExecuteNode(Block, Node->Scope.Element); + } break; // Variable - case NODETYPE_VARIABLE: ret = Variable_GetValue( Script, Node->Variable.Name ); break; + case NODETYPE_VARIABLE: + ret = Variable_GetValue( Block, Node ); + break; + // Element of an Object + case NODETYPE_ELEMENT: + tmpobj = AST_ExecuteNode( Block, Node->Scope.Element ); + if(tmpobj == ERRPTR) return ERRPTR; + if( !tmpobj || tmpobj->Type != SS_DATATYPE_OBJECT ) + { + AST_RuntimeError(Node->Scope.Element, "Unable to dereference a non-object"); + ret = ERRPTR; + break ; + } + + for( i = 0; i < tmpobj->Object->Type->NAttributes; i ++ ) + { + if( strcmp(Node->Scope.Name, tmpobj->Object->Type->AttributeDefs[i].Name) == 0 ) + { + ret = tmpobj->Object->Attributes[i]; + SpiderScript_ReferenceValue(ret); + break; + } + } + if( i == tmpobj->Object->Type->NAttributes ) + { + AST_RuntimeError(Node->Scope.Element, "Unknown attribute '%s' of class '%s'", + Node->Scope.Name, tmpobj->Object->Type->Name); + ret = ERRPTR; + } + break; + + // Cast a value to another + case NODETYPE_CAST: + { + tmpobj = AST_ExecuteNode(Block, Node->Cast.Value); + if(tmpobj == ERRPTR) return ERRPTR; + ret = SpiderScript_CastValueTo( Node->Cast.DataType, tmpobj ); + SpiderScript_DereferenceValue(tmpobj); + } + break; + + // Index into an array + case NODETYPE_INDEX: + op1 = AST_ExecuteNode(Block, Node->BinOp.Left); // Array + if(op1 == ERRPTR) return ERRPTR; + op2 = AST_ExecuteNode(Block, Node->BinOp.Right); // Offset + if(op2 == ERRPTR) { + SpiderScript_DereferenceValue(op1); + return ERRPTR; + } + + if( !op1 || op1->Type != SS_DATATYPE_ARRAY ) + { + // TODO: Implement "operator []" on objects + AST_RuntimeError(Node, "Indexing non-array"); + ret = ERRPTR; + break; + } + + if( (!op2 || op2->Type != SS_DATATYPE_INTEGER) && !Block->Script->Variant->bImplicitCasts ) { + AST_RuntimeError(Node, "Array index is not an integer"); + ret = ERRPTR; + break; + } + + if( !op2 || op2->Type != SS_DATATYPE_INTEGER ) + { + tmpobj = SpiderScript_CastValueTo(SS_DATATYPE_INTEGER, op2); + SpiderScript_DereferenceValue(op2); + op2 = tmpobj; + } + + if( op2->Integer >= op1->Array.Length ) { + AST_RuntimeError(Node, "Array index out of bounds %i >= %i", + op2->Integer, op1->Array.Length); + ret = ERRPTR; + break; + } + + ret = op1->Array.Items[ op2->Integer ]; + SpiderScript_ReferenceValue(ret); + + SpiderScript_DereferenceValue(op1); + SpiderScript_DereferenceValue(op2); + break; + // TODO: Implement runtime constants - case NODETYPE_CONSTANT: ret = ERRPTR; break; + case NODETYPE_CONSTANT: + // TODO: Scan namespace for constant name + AST_RuntimeError(Node, "TODO - Runtime Constants"); + ret = ERRPTR; + break; + // Constant Values - case NODETYPE_STRING: ret = Object_CreateString( Node->String.Length, Node->String.Data ); break; - case NODETYPE_INTEGER: ret = Object_CreateInteger( Node->Integer ); break; - case NODETYPE_REAL: ret = Object_CreateReal( Node->Real ); break; + case NODETYPE_STRING: + case NODETYPE_INTEGER: + case NODETYPE_REAL: + ret = &Node->Constant; + SpiderScript_ReferenceValue(ret); + break; // --- Operations --- // Boolean Operations + case NODETYPE_LOGICALNOT: // Logical NOT (!) + op1 = AST_ExecuteNode(Block, Node->UniOp.Value); + if(op1 == ERRPTR) return ERRPTR; + ret = SpiderScript_CreateInteger( !SpiderScript_IsValueTrue(op1) ); + SpiderScript_DereferenceValue(op1); + break; case NODETYPE_LOGICALAND: // Logical AND (&&) case NODETYPE_LOGICALOR: // Logical OR (||) case NODETYPE_LOGICALXOR: // Logical XOR (^^) - op1 = AST_ExecuteNode(Script, Node->BinOp.Left); - op2 = AST_ExecuteNode(Script, Node->BinOp.Right); + op1 = AST_ExecuteNode(Block, Node->BinOp.Left); + if(op1 == ERRPTR) return ERRPTR; + op2 = AST_ExecuteNode(Block, Node->BinOp.Right); + if(op2 == ERRPTR) { + SpiderScript_DereferenceValue(op1); + return ERRPTR; + } + switch( Node->Type ) { case NODETYPE_LOGICALAND: - ret = Object_CreateInteger( Object_IsTrue(op1) && Object_IsTrue(op2) ); + ret = SpiderScript_CreateInteger( SpiderScript_IsValueTrue(op1) && SpiderScript_IsValueTrue(op2) ); break; case NODETYPE_LOGICALOR: - ret = Object_CreateInteger( Object_IsTrue(op1) || Object_IsTrue(op2) ); + ret = SpiderScript_CreateInteger( SpiderScript_IsValueTrue(op1) || SpiderScript_IsValueTrue(op2) ); break; case NODETYPE_LOGICALXOR: - ret = Object_CreateInteger( Object_IsTrue(op1) ^ Object_IsTrue(op2) ); + ret = SpiderScript_CreateInteger( SpiderScript_IsValueTrue(op1) ^ SpiderScript_IsValueTrue(op2) ); break; default: break; } + + // Free intermediate objects + SpiderScript_DereferenceValue(op1); + SpiderScript_DereferenceValue(op2); break; // Comparisons case NODETYPE_EQUALS: case NODETYPE_LESSTHAN: case NODETYPE_GREATERTHAN: - op1 = AST_ExecuteNode(Script, Node->BinOp.Left); - op2 = AST_ExecuteNode(Script, Node->BinOp.Right); + case NODETYPE_LESSTHANEQUAL: + case NODETYPE_GREATERTHANEQUAL: + op1 = AST_ExecuteNode(Block, Node->BinOp.Left); + if(op1 == ERRPTR) return ERRPTR; + op2 = AST_ExecuteNode(Block, Node->BinOp.Right); + if(op2 == ERRPTR) { + SpiderScript_DereferenceValue(op1); + ret = ERRPTR; + break; + } - // No conversion done for NULL - // TODO: Determine if this will ever be needed - if( op1->Type == SS_DATATYPE_NULL ) - { - // NULLs always typecheck - ret = Object_CreateInteger(op2->Type == SS_DATATYPE_NULL); + if( !op1 || !op2 ) { + AST_RuntimeError(Node, "NULL Comparison (%p and %p)", op1, op2); + if(op1) SpiderScript_DereferenceValue(op1); + if(op2) SpiderScript_DereferenceValue(op2); + ret = SpiderScript_CreateInteger( !op1 && !op2 ); break; } // Convert types if( op1->Type != op2->Type ) { // If dynamically typed, convert op2 to op1's type - if(Script->Variant->bDyamicTyped) + if(Block->Script->Variant->bImplicitCasts) { - tmpvar = op2; - op2 = Object_CastTo(op1->Type, op2); - Object_Dereference(tmpvar); + tmpobj = op2; + op2 = SpiderScript_CastValueTo(op1->Type, op2); + SpiderScript_DereferenceValue(tmpobj); + if(op2 == ERRPTR) { + SpiderScript_DereferenceValue(op1); + return ERRPTR; + } } // If statically typed, this should never happen, but catch it anyway else { + AST_RuntimeError(Node, "Statically typed implicit cast %i %i", + op1->Type, op2->Type); ret = ERRPTR; break; } @@ -257,8 +909,6 @@ tSpiderVariable *AST_ExecuteNode(tSpiderScript *Script, tAST_Node *Node) // Do operation switch(op1->Type) { - // - NULL - case SS_DATATYPE_NULL: break; // - String Compare (does a strcmp, well memcmp) case SS_DATATYPE_STRING: // Call memcmp to do most of the work @@ -276,25 +926,58 @@ tSpiderVariable *AST_ExecuteNode(tSpiderScript *Script, tAST_Node *Node) cmp = -1; } break; + + // - Integer Comparisons + case SS_DATATYPE_INTEGER: + if( op1->Integer == op2->Integer ) + cmp = 0; + else if( op1->Integer < op2->Integer ) + cmp = -1; + else + cmp = 1; + break; + // - Real Number Comparisons + case SS_DATATYPE_REAL: + cmp = (op1->Real - op2->Real) / op2->Real * 10000; // < 0.1% difference is equality + break; + default: + AST_RuntimeError(Node, "TODO - Comparison of type %i", op1->Type); + ret = ERRPTR; + break; } // Free intermediate objects - Object_Dereference(op1); - Object_Dereference(op2); + SpiderScript_DereferenceValue(op1); + SpiderScript_DereferenceValue(op2); + + // Error check + if( ret == ERRPTR ) + break; // Create return switch(Node->Type) { - case NODETYPE_EQUALS: ret = Object_CreateInteger(cmp == 0); break; - case NODETYPE_LESSTHAN: ret = Object_CreateInteger(cmp < 0); break; - case NODETYPE_GREATERTHAN: ret = Object_CreateInteger(cmp > 0); break; + case NODETYPE_EQUALS: ret = SpiderScript_CreateInteger(cmp == 0); break; + case NODETYPE_LESSTHAN: ret = SpiderScript_CreateInteger(cmp < 0); break; + case NODETYPE_GREATERTHAN: ret = SpiderScript_CreateInteger(cmp > 0); break; + case NODETYPE_LESSTHANEQUAL: ret = SpiderScript_CreateInteger(cmp <= 0); break; + case NODETYPE_GREATERTHANEQUAL: ret = SpiderScript_CreateInteger(cmp >= 0); break; default: - fprintf(stderr, "SpiderScript internal error: Exec,CmpOp unknown op %i", Node->Type); + AST_RuntimeError(Node, "Exec,CmpOp unknown op %i", Node->Type); ret = ERRPTR; break; } break; + // General Unary Operations + case NODETYPE_BWNOT: // Bitwise NOT (~) + case NODETYPE_NEGATE: // Negation (-) + op1 = AST_ExecuteNode(Block, Node->UniOp.Value); + if(op1 == ERRPTR) return ERRPTR; + ret = AST_ExecuteNode_UniOp(Block->Script, Node, Node->Type, op1); + SpiderScript_DereferenceValue(op1); + break; + // General Binary Operations case NODETYPE_ADD: case NODETYPE_SUBTRACT: @@ -308,72 +991,410 @@ tSpiderVariable *AST_ExecuteNode(tSpiderScript *Script, tAST_Node *Node) case NODETYPE_BITSHIFTRIGHT: case NODETYPE_BITROTATELEFT: // Get operands - op1 = AST_ExecuteNode(Script, Node->BinOp.Left); - op2 = AST_ExecuteNode(Script, Node->BinOp.Right); + op1 = AST_ExecuteNode(Block, Node->BinOp.Left); + if(op1 == ERRPTR) return ERRPTR; + op2 = AST_ExecuteNode(Block, Node->BinOp.Right); + if(op2 == ERRPTR) { + SpiderScript_DereferenceValue(op1); + return ERRPTR; + } - // Convert types - if( op1->Type != op2->Type ) { - // If dynamically typed, convert op2 to op1's type - if(Script->Variant->bDyamicTyped) + ret = AST_ExecuteNode_BinOp(Block->Script, Node, Node->Type, op1, op2); + + // Free intermediate objects + SpiderScript_DereferenceValue(op1); + SpiderScript_DereferenceValue(op2); + break; + + //default: + // ret = NULL; + // AST_RuntimeError(Node, "BUG - SpiderScript AST_ExecuteNode Unimplemented %i", Node->Type); + // break; + } +_return: + // Reset namespace when no longer needed + if( Node->Type != NODETYPE_SCOPE ) + Block->CurNamespace = NULL; + + #if TRACE_NODE_RETURNS + if(ret && ret != ERRPTR) { + AST_RuntimeError(Node, "Ret type of %p %i is %i", Node, Node->Type, ret->Type); + } + else { + AST_RuntimeError(Node, "Ret type of %p %i is %p", Node, Node->Type, ret); + } + #endif + + return ret; +} + +tSpiderValue *AST_ExecuteNode_UniOp(tSpiderScript *Script, tAST_Node *Node, int Operation, tSpiderValue *Value) +{ + tSpiderValue *ret; + #if 0 + if( Value->Type == SS_DATATYPE_OBJECT ) + { + const char *fcnname; + switch(Operation) + { + case NODETYPE_NEGATE: fcnname = "-ve"; break; + case NODETYPE_BWNOT: fcnname = "~"; break; + default: fcnname = NULL; break; + } + + if( fcnname ) + { + ret = Object_ExecuteMethod(Value->Object, fcnname, ); + if( ret != ERRPTR ) + return ret; + } + } + #endif + switch(Value->Type) + { + // Integer Operations + case SS_DATATYPE_INTEGER: + if( Value->ReferenceCount == 1 ) + SpiderScript_ReferenceValue(ret = Value); + else + ret = SpiderScript_CreateInteger(0); + switch(Operation) + { + case NODETYPE_NEGATE: ret->Integer = -Value->Integer; break; + case NODETYPE_BWNOT: ret->Integer = ~Value->Integer; break; + default: + AST_RuntimeError(Node, "SpiderScript internal error: Exec,UniOP,Integer unknown op %i", Operation); + SpiderScript_DereferenceValue(ret); + ret = ERRPTR; + break; + } + break; + // Real number Operations + case SS_DATATYPE_REAL: + switch(Operation) + { + case NODETYPE_NEGATE: ret = SpiderScript_CreateInteger( -Value->Real ); break; + default: + AST_RuntimeError(Node, "SpiderScript internal error: Exec,UniOP,Real unknown op %i", Operation); + ret = ERRPTR; + break; + } + break; + + default: + AST_RuntimeError(NULL, "Invalid operation (%i) on type (%i)", Operation, Value->Type); + ret = ERRPTR; + break; + } + + return ret; +} + +tSpiderValue *AST_ExecuteNode_BinOp(tSpiderScript *Script, tAST_Node *Node, int Operation, tSpiderValue *Left, tSpiderValue *Right) +{ + tSpiderValue *preCastValue = Right; + tSpiderValue *ret; + + // Convert types + if( Left && Right && Left->Type != Right->Type ) + { + #if 0 + // Object types + // - Operator overload functions + if( Left->Type == SS_DATATYPE_OBJECT ) + { + const char *fcnname; + switch(Operation) { - tmpvar = op2; - op2 = Object_CastTo(op1->Type, op2); - Object_Dereference(tmpvar); + case NODETYPE_ADD: fcnname = "+"; break; + case NODETYPE_SUBTRACT: fcnname = "-"; break; + case NODETYPE_MULTIPLY: fcnname = "*"; break; + case NODETYPE_DIVIDE: fcnname = "/"; break; + case NODETYPE_MODULO: fcnname = "%"; break; + case NODETYPE_BWAND: fcnname = "&"; break; + case NODETYPE_BWOR: fcnname = "|"; break; + case NODETYPE_BWXOR: fcnname = "^"; break; + case NODETYPE_BITSHIFTLEFT: fcnname = "<<"; break; + case NODETYPE_BITSHIFTRIGHT:fcnname = ">>"; break; + case NODETYPE_BITROTATELEFT:fcnname = "<<<"; break; + default: fcnname = NULL; break; } - // If statically typed, this should never happen, but catch it anyway - else { - ret = ERRPTR; - break; + + if( fcnname ) + { + ret = Object_ExecuteMethod(Left->Object, fcnname, Right); + if( ret != ERRPTR ) + return ret; + // Fall through and try casting (which will usually fail) } } + #endif - // Do operation - switch(op1->Type) + // If implicit casts are allowed, convert Right to Left's type + if(Script->Variant->bImplicitCasts) { - case SS_DATATYPE_NULL: break; - // String Concatenation - case SS_DATATYPE_STRING: - switch(Node->Type) + Right = SpiderScript_CastValueTo(Left->Type, Right); + if(Right == ERRPTR) + return ERRPTR; + } + // If statically typed, this should never happen, but catch it anyway + else { + AST_RuntimeError(Node, "Implicit cast not allowed (from %i to %i)", Right->Type, Left->Type); + return ERRPTR; + } + } + + // NULL Check + if( Left == NULL || Right == NULL ) { + if(Right && Right != preCastValue) free(Right); + return NULL; + } + + // Do operation + switch(Left->Type) + { + // String Concatenation + case SS_DATATYPE_STRING: + switch(Operation) + { + case NODETYPE_ADD: // Concatenate + ret = SpiderScript_StringConcat(Left, Right); + break; + // TODO: Support python style 'i = %i' % i ? + // Might do it via a function call + // Implement it via % with an array, but getting past the cast will be fun +// case NODETYPE_MODULUS: +// break; + // TODO: Support string repititions +// case NODETYPE_MULTIPLY: +// break; + + default: + AST_RuntimeError(Node, "SpiderScript internal error: Exec,BinOP,String unknown op %i", Operation); + ret = ERRPTR; + break; + } + break; + // Integer Operations + case SS_DATATYPE_INTEGER: + if( Left->ReferenceCount == 1 ) + SpiderScript_ReferenceValue(ret = Left); + else + ret = SpiderScript_CreateInteger(0); + switch(Operation) + { + case NODETYPE_ADD: ret->Integer = Left->Integer + Right->Integer; break; + case NODETYPE_SUBTRACT: ret->Integer = Left->Integer - Right->Integer; break; + case NODETYPE_MULTIPLY: ret->Integer = Left->Integer * Right->Integer; break; + case NODETYPE_DIVIDE: ret->Integer = Left->Integer / Right->Integer; break; + case NODETYPE_MODULO: ret->Integer = Left->Integer % Right->Integer; break; + case NODETYPE_BWAND: ret->Integer = Left->Integer & Right->Integer; break; + case NODETYPE_BWOR: ret->Integer = Left->Integer | Right->Integer; break; + case NODETYPE_BWXOR: ret->Integer = Left->Integer ^ Right->Integer; break; + case NODETYPE_BITSHIFTLEFT: ret->Integer = Left->Integer << Right->Integer; break; + case NODETYPE_BITSHIFTRIGHT:ret->Integer = Left->Integer >> Right->Integer; break; + case NODETYPE_BITROTATELEFT: + ret->Integer = (Left->Integer << Right->Integer) | (Left->Integer >> (64-Right->Integer)); + break; + default: + AST_RuntimeError(Node, "SpiderScript internal error: Exec,BinOP,Integer unknown op %i", Operation); + SpiderScript_DereferenceValue(ret); + ret = ERRPTR; + break; + } + break; + + // Real Numbers + case SS_DATATYPE_REAL: + if( Left->ReferenceCount == 1 ) + SpiderScript_ReferenceValue(ret = Left); + else + ret = SpiderScript_CreateReal(0); + switch(Operation) + { + case NODETYPE_ADD: ret->Real = Left->Real + Right->Real; break; + case NODETYPE_SUBTRACT: ret->Real = Left->Real - Right->Real; break; + case NODETYPE_MULTIPLY: ret->Real = Left->Real * Right->Real; break; + case NODETYPE_DIVIDE: ret->Real = Left->Real / Right->Real; break; + default: + AST_RuntimeError(Node, "SpiderScript internal error: Exec,BinOP,Real unknown op %i", Operation); + SpiderScript_DereferenceValue(ret); + ret = ERRPTR; + break; + } + break; + + default: + AST_RuntimeError(Node, "BUG - Invalid operation (%i) on type (%i)", Operation, Left->Type); + ret = ERRPTR; + break; + } + + if(Right && Right != preCastValue) free(Right); + + return ret; +} + +/** + * \brief Define a variable + * \param Block Current block state + * \param Type Type of the variable + * \param Name Name of the variable + * \return Boolean Failure + */ +tAST_Variable *Variable_Define(tAST_BlockState *Block, int Type, const char *Name, tSpiderValue *Value) +{ + tAST_Variable *var, *prev = NULL; + + for( var = Block->FirstVar; var; prev = var, var = var->Next ) + { + if( strcmp(var->Name, Name) == 0 ) { + AST_RuntimeError(NULL, "Redefinition of variable '%s'", Name); + return ERRPTR; + } + } + + var = malloc( sizeof(tAST_Variable) + strlen(Name) + 1 ); + var->Next = NULL; + var->Type = Type; + var->Object = Value; + if(Value) SpiderScript_ReferenceValue(Value); + strcpy(var->Name, Name); + + if(prev) prev->Next = var; + else Block->FirstVar = var; + + //printf("Defined variable %s (%i)\n", Name, Type); + + return var; +} + +tAST_Variable *Variable_Lookup(tAST_BlockState *Block, tAST_Node *VarNode, int CreateType) +{ + tAST_Variable *var = NULL; + + // Speed hack + if( VarNode->BlockState == Block && VarNode->BlockIdent == Block->Ident ) { + var = VarNode->ValueCache; + #if TRACE_VAR_LOOKUPS + AST_RuntimeMessage(VarNode, "debug", "Fast var fetch on '%s' %p (%p:%i)", + VarNode->Variable.Name, var, + VarNode->BlockState, VarNode->BlockIdent + ); + #endif + } + else + { + tAST_BlockState *bs; + for( bs = Block; bs; bs = bs->Parent ) + { + for( var = bs->FirstVar; var; var = var->Next ) { - default: - fprintf(stderr, "SpiderScript internal error: Exec,BinOP,String unknown op %i", Node->Type); - ret = ERRPTR; - break; + if( strcmp(var->Name, VarNode->Variable.Name) == 0 ) + break; } - break; - case SS_DATATYPE_INTEGER: - switch(Node->Type) + if(var) break; + } + + if( !var ) + { + if( Block->Script->Variant->bDyamicTyped && CreateType != SS_DATATYPE_UNDEF ) { + // Define variable + var = Variable_Define(Block, CreateType, VarNode->Variable.Name, NULL); + } + else { - case NODETYPE_ADD: ret = Object_CreateInteger( op1->Integer + op2->Integer ); break; - case NODETYPE_SUBTRACT: ret = Object_CreateInteger( op1->Integer - op2->Integer ); break; - case NODETYPE_MULTIPLY: ret = Object_CreateInteger( op1->Integer * op2->Integer ); break; - case NODETYPE_DIVIDE: ret = Object_CreateInteger( op1->Integer / op2->Integer ); break; - case NODETYPE_MODULO: ret = Object_CreateInteger( op1->Integer % op2->Integer ); break; - case NODETYPE_BWAND: ret = Object_CreateInteger( op1->Integer & op2->Integer ); break; - case NODETYPE_BWOR: ret = Object_CreateInteger( op1->Integer | op2->Integer ); break; - case NODETYPE_BWXOR: ret = Object_CreateInteger( op1->Integer ^ op2->Integer ); break; - case NODETYPE_BITSHIFTLEFT: ret = Object_CreateInteger( op1->Integer << op2->Integer ); break; - case NODETYPE_BITSHIFTRIGHT:ret = Object_CreateInteger( op1->Integer >> op2->Integer ); break; - case NODETYPE_BITROTATELEFT: - ret = Object_CreateInteger( (op1->Integer << op2->Integer) | (op1->Integer >> (64-op2->Integer)) ); - break; - default: - fprintf(stderr, "SpiderScript internal error: Exec,BinOP,Integer unknown op %i", Node->Type); - ret = ERRPTR; - break; + AST_RuntimeError(VarNode, "Variable '%s' is undefined", VarNode->Variable.Name); + return NULL; } - break; } - // Free intermediate objects - Object_Dereference(op1); - Object_Dereference(op2); - break; + #if TRACE_VAR_LOOKUPS + AST_RuntimeMessage(VarNode, "debug", "Saved variable lookup of '%s' %p (%p:%i)", + VarNode->Variable.Name, var, + Block, Block->Ident); + #endif + + VarNode->ValueCache = var; + VarNode->BlockState = Block; + VarNode->BlockIdent = Block->Ident; + } - //default: - // ret = NULL; - // fprintf(stderr, "ERROR: SpiderScript AST_ExecuteNode Unimplemented %i\n", Node->Type); - // break; + return var; +} + +/** + * \brief Set the value of a variable + * \return Boolean Failure + */ +int Variable_SetValue(tAST_BlockState *Block, tAST_Node *VarNode, tSpiderValue *Value) +{ + tAST_Variable *var; + + var = Variable_Lookup(Block, VarNode, (Value ? Value->Type : SS_DATATYPE_UNDEF)); + + if( !var ) return -1; + + if( !Block->Script->Variant->bDyamicTyped && (Value && var->Type != Value->Type) ) + { + AST_RuntimeError(VarNode, "Type mismatch assigning to '%s'", + VarNode->Variable.Name); + return -2; } - return ret; + +// printf("Assign %p to '%s'\n", Value, var->Name); + SpiderScript_ReferenceValue(Value); + SpiderScript_DereferenceValue(var->Object); + var->Object = Value; + return 0; +} + +/** + * \brief Get the value of a variable + */ +tSpiderValue *Variable_GetValue(tAST_BlockState *Block, tAST_Node *VarNode) +{ + tAST_Variable *var = Variable_Lookup(Block, VarNode, 0); + + if( !var ) return ERRPTR; + + SpiderScript_ReferenceValue(var->Object); + return var->Object; +} + +/** + * \brief Destorys a variable + */ +void Variable_Destroy(tAST_Variable *Variable) +{ +// printf("Variable_Destroy: (%p'%s')\n", Variable, Variable->Name); + SpiderScript_DereferenceValue(Variable->Object); + free(Variable); +} + +void AST_RuntimeMessage(tAST_Node *Node, const char *Type, const char *Format, ...) +{ + va_list args; + + if(Node) { + fprintf(stderr, "%s:%i: ", Node->File, Node->Line); + } + fprintf(stderr, "%s: ", Type); + va_start(args, Format); + vfprintf(stderr, Format, args); + va_end(args); + fprintf(stderr, "\n"); +} +void AST_RuntimeError(tAST_Node *Node, const char *Format, ...) +{ + va_list args; + + if(Node) { + fprintf(stderr, "%s:%i: ", Node->File, Node->Line); + } + fprintf(stderr, "error: "); + va_start(args, Format); + vfprintf(stderr, Format, args); + va_end(args); + fprintf(stderr, "\n"); }