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jsparse.c
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/*
* This file is part of Espruino, a JavaScript interpreter for Microcontrollers
*
* Copyright (C) 2013 Gordon Williams <[email protected]>
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* ----------------------------------------------------------------------------
* Recursive descent parser for code execution
* ----------------------------------------------------------------------------
*/
#include "jsparse.h"
#include "jsinteractive.h"
#include "jswrapper.h"
#include "jsnative.h"
#include "jswrap_object.h" // for function_replacewith
/* Info about execution when Parsing - this saves passing it on the stack
* for each call */
JsExecInfo execInfo;
// ----------------------------------------------- Forward decls
JsVar *jspeAssignmentExpression();
JsVar *jspeExpression();
JsVar *jspeUnaryExpression();
JsVar *jspeBlock();
JsVar *jspeStatement();
JsVar *jspeFactor();
void jspEnsureIsPrototype(JsVar *instanceOf, JsVar *prototypeName);
// ----------------------------------------------- Utils
#define JSP_MATCH_WITH_CLEANUP_AND_RETURN(TOKEN, CLEANUP_CODE, RETURN_VAL) { if (!jslMatch(execInfo.lex,(TOKEN))) { CLEANUP_CODE; return RETURN_VAL; } }
#define JSP_MATCH_WITH_RETURN(TOKEN, RETURN_VAL) JSP_MATCH_WITH_CLEANUP_AND_RETURN(TOKEN, , RETURN_VAL)
#define JSP_MATCH(TOKEN) JSP_MATCH_WITH_CLEANUP_AND_RETURN(TOKEN, , 0) // Match where the user could have given us the wrong token
#define JSP_ASSERT_MATCH(TOKEN) { assert(execInfo.lex->tk==(TOKEN));jslGetNextToken(execInfo.lex); } // Match where if we have the wrong token, it's an internal error
#define JSP_SHOULD_EXECUTE (((execInfo.execute)&EXEC_RUN_MASK)==EXEC_YES)
#define JSP_SAVE_EXECUTE() JsExecFlags oldExecute = execInfo.execute
#define JSP_RESTORE_EXECUTE() execInfo.execute = (execInfo.execute&(JsExecFlags)(~EXEC_SAVE_RESTORE_MASK)) | (oldExecute&EXEC_SAVE_RESTORE_MASK);
#define JSP_HAS_ERROR (((execInfo.execute)&EXEC_ERROR_MASK)!=0)
#define JSP_SHOULDNT_PARSE (((execInfo.execute)&EXEC_NO_PARSE_MASK)!=0)
/// if interrupting execution, this is set
bool jspIsInterrupted() {
return (execInfo.execute & EXEC_INTERRUPTED)!=0;
}
/// if interrupting execution, this is set
void jspSetInterrupted(bool interrupt) {
if (interrupt)
execInfo.execute = execInfo.execute | EXEC_INTERRUPTED;
else
execInfo.execute = execInfo.execute & (JsExecFlags)~EXEC_INTERRUPTED;
}
/// Set the error flag - set lineReported if we've already output the line number
void jspSetError(bool lineReported) {
execInfo.execute = (execInfo.execute & (JsExecFlags)~EXEC_YES) | EXEC_ERROR;
if (lineReported)
execInfo.execute |= EXEC_ERROR_LINE_REPORTED;
}
bool jspHasError() {
return JSP_HAS_ERROR;
}
void jspReplaceWith(JsVar *dst, JsVar *src) {
// If this is an index in an array buffer, write directly into the array buffer
if (jsvIsArrayBufferName(dst)) {
size_t idx = (size_t)jsvGetInteger(dst);
JsVar *arrayBuffer = jsvLock(jsvGetFirstChild(dst));
jsvArrayBufferSet(arrayBuffer, idx, src);
jsvUnLock(arrayBuffer);
return;
}
// if destination isn't there, isn't a 'name', or is used, give an error
if (!jsvIsName(dst)) {
jsExceptionHere(JSET_ERROR, "Unable to assign value to non-reference %t", dst);
return;
}
jsvSetValueOfName(dst, src);
/* If dst is flagged as a new child, it means that
* it was previously undefined, and we need to add it to
* the given object when it is set.
*/
if (jsvIsNewChild(dst)) {
// Get what it should have been a child of
JsVar *parent = jsvLock(jsvGetNextSibling(dst));
// Remove the 'new child' flagging
jsvUnRef(parent);
jsvSetNextSibling(dst, 0);
jsvUnRef(parent);
jsvSetPrevSibling(dst, 0);
// Add to the parent
jsvAddName(parent, dst);
jsvUnLock(parent);
}
}
void jspeiInit(JsLex *lex) {
execInfo.lex = lex;
execInfo.scopeCount = 0;
execInfo.execute = EXEC_YES;
execInfo.thisVar = 0;
}
void jspeiKill() {
execInfo.lex = 0;
assert(execInfo.scopeCount==0);
}
bool jspeiAddScope(JsVar *scope) {
if (execInfo.scopeCount >= JSPARSE_MAX_SCOPES) {
jsExceptionHere(JSET_ERROR, "Maximum number of scopes exceeded");
jspSetError(false);
return false;
}
execInfo.scopes[execInfo.scopeCount++] = jsvLockAgain(scope);
return true;
}
void jspeiRemoveScope() {
if (execInfo.scopeCount <= 0) {
jsExceptionHere(JSET_INTERNALERROR, "Too many scopes removed");
jspSetError(false);
return;
}
jsvUnLock(execInfo.scopes[--execInfo.scopeCount]);
}
JsVar *jspeiFindInScopes(const char *name) {
int i;
for (i=execInfo.scopeCount-1;i>=0;i--) {
JsVar *ref = jsvFindChildFromString(execInfo.scopes[i], name, false);
if (ref) return ref;
}
return jsvFindChildFromString(execInfo.root, name, false);
}
// TODO: get rid of these, use jspeiGetTopScope instead
JsVar *jspeiFindOnTop(const char *name, bool createIfNotFound) {
if (execInfo.scopeCount>0)
return jsvFindChildFromString(execInfo.scopes[execInfo.scopeCount-1], name, createIfNotFound);
return jsvFindChildFromString(execInfo.root, name, createIfNotFound);
}
JsVar *jspeiFindNameOnTop(JsVar *childName, bool createIfNotFound) {
if (execInfo.scopeCount>0)
return jsvFindChildFromVar(execInfo.scopes[execInfo.scopeCount-1], childName, createIfNotFound);
return jsvFindChildFromVar(execInfo.root, childName, createIfNotFound);
}
/** Here we assume that we have already looked in the parent itself -
* and are now going down looking at the stuff it inherited */
JsVar *jspeiFindChildFromStringInParents(JsVar *parent, const char *name) {
if (jsvIsObject(parent)) {
// If an object, look for an 'inherits' var
JsVar *inheritsFrom = jsvObjectGetChild(parent, JSPARSE_INHERITS_VAR, 0);
// if there's no inheritsFrom, just default to 'Object.prototype'
if (!inheritsFrom) {
JsVar *obj = jsvObjectGetChild(execInfo.root, "Object", 0);
if (obj) {
inheritsFrom = jsvObjectGetChild(obj, JSPARSE_PROTOTYPE_VAR, 0);
jsvUnLock(obj);
}
}
if (inheritsFrom && inheritsFrom!=parent) {
// we have what it inherits from (this is ACTUALLY the prototype var)
// https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Object/proto
JsVar *child = jsvFindChildFromString(inheritsFrom, name, false);
if (!child)
child = jspeiFindChildFromStringInParents(inheritsFrom, name);
jsvUnLock(inheritsFrom);
if (child) return child;
} else
jsvUnLock(inheritsFrom);
} else { // Not actually an object - but might be an array/string/etc
const char *objectName = jswGetBasicObjectName(parent);
while (objectName) {
JsVar *objName = jsvFindChildFromString(execInfo.root, objectName, false);
if (objName) {
JsVar *result = 0;
JsVar *obj = jsvSkipNameAndUnLock(objName);
// could be something the user has made - eg. 'Array=1'
if (jsvHasChildren(obj)) {
// We have found an object with this name - search for the prototype var
JsVar *proto = jsvObjectGetChild(obj, JSPARSE_PROTOTYPE_VAR, 0);
if (proto) {
result = jsvFindChildFromString(proto, name, false);
jsvUnLock(proto);
}
}
jsvUnLock(obj);
if (result) return result;
}
/* We haven't found anything in the actual object, we should check the 'Object' itself
eg, we tried 'String', so now we should try 'Object'. Built-in types don't have room for
a prototype field, so we hard-code it */
objectName = jswGetBasicObjectPrototypeName(objectName);
}
}
// no luck!
return 0;
}
JsVar *jspeiGetScopesAsVar() {
if (execInfo.scopeCount==0)
return 0;
if (execInfo.scopeCount==1)
return jsvLockAgain(execInfo.scopes[0]);
JsVar *arr = jsvNewWithFlags(JSV_ARRAY);
int i;
for (i=0;i<execInfo.scopeCount;i++) {
JsVar *idx = jsvMakeIntoVariableName(jsvNewFromInteger(i), execInfo.scopes[i]);
if (!idx) { // out of memory
jspSetError(false);
return arr;
}
jsvAddName(arr, idx);
jsvUnLock(idx);
}
return arr;
}
void jspeiLoadScopesFromVar(JsVar *arr) {
execInfo.scopeCount = 0;
if (jsvIsArray(arr)) {
JsvObjectIterator it;
jsvObjectIteratorNew(&it, arr);
while (jsvObjectIteratorHasValue(&it)) {
execInfo.scopes[execInfo.scopeCount++] = jsvObjectIteratorGetValue(&it);
jsvObjectIteratorNext(&it);
}
jsvObjectIteratorFree(&it);
} else
execInfo.scopes[execInfo.scopeCount++] = jsvLockAgain(arr);
}
// -----------------------------------------------
bool jspCheckStackPosition() {
if (jsuGetFreeStack() < 512) { // giving us 512 bytes leeway
jsExceptionHere(JSET_ERROR, "Too much recursion - the stack is about to overflow");
jspSetInterrupted(true);
return false;
}
return true;
}
// Set execFlags such that we are not executing
void jspSetNoExecute() {
execInfo.execute = (execInfo.execute & (JsExecFlags)(int)~EXEC_RUN_MASK) | EXEC_NO;
}
void jspAppendStackTrace(JsVar *stackTrace) {
JsvStringIterator it;
jsvStringIteratorNew(&it, stackTrace, 0);
jsvStringIteratorGotoEnd(&it);
jslPrintPosition((vcbprintf_callback)jsvStringIteratorPrintfCallback, &it, execInfo.lex, execInfo.lex->tokenLastStart);
jslPrintTokenLineMarker((vcbprintf_callback)jsvStringIteratorPrintfCallback, &it, execInfo.lex, execInfo.lex->tokenLastStart);
jsvStringIteratorFree(&it);
}
/// We had an exception (argument is the exception's value)
void jspSetException(JsVar *value) {
// Add the exception itself to a variable in root scope
JsVar *exception = jsvFindChildFromString(execInfo.hiddenRoot, JSPARSE_EXCEPTION_VAR, true);
if (exception) {
jsvSetValueOfName(exception, value);
jsvUnLock(exception);
}
// Set the exception flag
execInfo.execute = execInfo.execute | EXEC_EXCEPTION;
// Try and do a stack trace
if (execInfo.lex) {
JsVar *stackTrace = jsvObjectGetChild(execInfo.hiddenRoot, JSPARSE_STACKTRACE_VAR, JSV_STRING_0);
if (stackTrace) {
jsvAppendPrintf(stackTrace, " at ");
jspAppendStackTrace(stackTrace);
jsvUnLock(stackTrace);
// stop us from printing the trace in the same block
execInfo.execute = execInfo.execute | EXEC_ERROR_LINE_REPORTED;
}
}
}
/** Return the reported exception if there was one (and clear it) */
JsVar *jspGetException() {
JsVar *exceptionName = jsvFindChildFromString(execInfo.hiddenRoot, JSPARSE_EXCEPTION_VAR, false);
if (exceptionName) {
JsVar *exception = jsvSkipName(exceptionName);
jsvRemoveChild(execInfo.hiddenRoot, exceptionName);
jsvUnLock(exceptionName);
return exception;
}
return 0;
}
/** Return a stack trace string if there was one (and clear it) */
JsVar *jspGetStackTrace() {
JsVar *stackTraceName = jsvFindChildFromString(execInfo.hiddenRoot, JSPARSE_STACKTRACE_VAR, false);
if (stackTraceName) {
JsVar *stackTrace = jsvSkipName(stackTraceName);
jsvRemoveChild(execInfo.hiddenRoot, stackTraceName);
jsvUnLock(stackTraceName);
return stackTrace;
}
return 0;
}
// ----------------------------------------------
// we return a value so that JSP_MATCH can return 0 if it fails (if we pass 0, we just parse all args)
NO_INLINE bool jspeFunctionArguments(JsVar *funcVar) {
JSP_MATCH('(');
while (execInfo.lex->tk!=')') {
if (funcVar) {
JsVar *param = jsvAddNamedChild(funcVar, 0, jslGetTokenValueAsString(execInfo.lex));
if (!param) { // out of memory
jspSetError(false);
return false;
}
jsvMakeFunctionParameter(param); // force this to be called a function parameter
jsvUnLock(param);
}
JSP_MATCH(LEX_ID);
if (execInfo.lex->tk!=')') JSP_MATCH(',');
}
JSP_MATCH(')');
return true;
}
NO_INLINE JsVar *jspeFunctionDefinition(bool parseNamedFunction) {
// actually parse a function... We assume that the LEX_FUNCTION and name
// have already been parsed
JsVar *funcVar = 0;
bool actuallyCreateFunction = JSP_SHOULD_EXECUTE || ((execInfo.execute&EXEC_PARSE_FUNCTION_DECL)!=0);
if (actuallyCreateFunction)
funcVar = jsvNewWithFlags(JSV_FUNCTION);
JsVar *functionInternalName = 0;
if (parseNamedFunction && execInfo.lex->tk==LEX_ID) {
// you can do `var a = function foo() { foo(); };` - so cope with this
if (funcVar) functionInternalName = jslGetTokenValueAsVar(execInfo.lex);
// note that we don't add it to the beginning, because it would mess up our function call code
JSP_MATCH(LEX_ID);
}
// Get arguments save them to the structure
if (!jspeFunctionArguments(funcVar)) {
jsvUnLock(functionInternalName);
jsvUnLock(funcVar);
// parse failed
return 0;
}
// Get the code - first parse it so we know where it stops
JslCharPos funcBegin = jslCharPosClone(&execInfo.lex->tokenStart);
JSP_SAVE_EXECUTE();
jspSetNoExecute();
jsvUnLock(jspeBlock());
JSP_RESTORE_EXECUTE();
// Then create var and set
if (actuallyCreateFunction) {
// code var
JsVar *funcCodeVar = jslNewFromLexer(&funcBegin, (size_t)(execInfo.lex->tokenLastStart+1));
jsvUnLock(jsvAddNamedChild(funcVar, funcCodeVar, JSPARSE_FUNCTION_CODE_NAME));
jsvUnLock(funcCodeVar);
// scope var
JsVar *funcScopeVar = jspeiGetScopesAsVar();
if (funcScopeVar) {
jsvUnLock(jsvAddNamedChild(funcVar, funcScopeVar, JSPARSE_FUNCTION_SCOPE_NAME));
jsvUnLock(funcScopeVar);
}
// if we had a function name, add it to the end
if (functionInternalName)
jsvUnLock(jsvObjectSetChild(funcVar, JSPARSE_FUNCTION_NAME_NAME, functionInternalName));
}
jslCharPosFree(&funcBegin);
return funcVar;
}
/* Parse just the brackets of a function - and throw
* everything away */
NO_INLINE bool jspeParseFunctionCallBrackets() {
JSP_MATCH('(');
while (!JSP_SHOULDNT_PARSE && execInfo.lex->tk != ')') {
jsvUnLock(jspeAssignmentExpression());
if (execInfo.lex->tk!=')') JSP_MATCH(',');
}
if (!JSP_SHOULDNT_PARSE) JSP_MATCH(')');
return 0;
}
/** Handle a function call (assumes we've parsed the function name and we're
* on the start bracket). 'thisArg' is the value of the 'this' variable when the
* function is executed (it's usually the parent object)
*
*
* NOTE: this does not set the execInfo flags - so if execInfo==EXEC_NO, it won't execute
*
* If !isParsing and arg0!=0, argument 0 is set to what is supplied (same with arg1)
*
* functionName is used only for error reporting - and can be 0
*/
NO_INLINE JsVar *jspeFunctionCall(JsVar *function, JsVar *functionName, JsVar *thisArg, bool isParsing, int argCount, JsVar **argPtr) {
if (JSP_SHOULD_EXECUTE && !function) {
jsExceptionHere(JSET_ERROR, functionName ? "Function %q not found!" : "Function not found!", functionName);
return 0;
}
if (JSP_SHOULD_EXECUTE) if (!jspCheckStackPosition()) return 0; // try and ensure that we won't overflow our stack
//jsiConsolePrintf("before JSP_SHOULD_EXECUTE = %d!\n",JSP_SHOULD_EXECUTE);
if (JSP_SHOULD_EXECUTE && function) {
//jsiConsolePrintf("in JSP_SHOULD_EXECUTE\n");
JsVar *functionRoot;
JsVar *returnVarName;
JsVar *returnVar;
//jsiConsolePrintf("in JSP_SHOULD_EXECUTE1\n");
if (!jsvIsFunction(function)) {
//jsiConsolePrintf("in JSP_SHOULD_EXECUTE 1.5\n");
jsExceptionHere(JSET_ERROR, "Expecting a function to call, got %t", function);
return 0;
}
//jsiConsolePrintf("in JSP_SHOULD_EXECUTE 2\n");
if (isParsing) JSP_MATCH('(');
/* Ok, so we have 4 options here.
*
* 1: we're native.
* a) args have been pre-parsed, which is awesome
* b) we have to parse our own args into an array
* 2: we're not native
* a) args were pre-parsed and we have to populate the function
* b) we parse our own args, which is possibly better
*/
//jsiConsolePrintf("before jsvIsNative!\n");
if (jsvIsNative(function)) {
if (isParsing) {
#define MAX_ARGS 16
argPtr = (JsVar**)alloca(sizeof(JsVar*)*MAX_ARGS);
argCount = 0;
//jsiConsolePrintf("before paring args!\n");
while (!JSP_SHOULDNT_PARSE && execInfo.lex->tk!=')' && execInfo.lex->tk!=LEX_EOF && argCount<MAX_ARGS) {
argPtr[argCount++] = jsvSkipNameAndUnLock(jspeAssignmentExpression());
if (execInfo.lex->tk!=')') JSP_MATCH_WITH_CLEANUP_AND_RETURN(',',while(argCount)jsvUnLock(argPtr[--argCount]);, 0);
}
JSP_MATCH(')');
}
//if(argCount >= 1 && jsvIsInt(argPtr[1])) jsiConsolePrintf("int = %d, argCount = %d\n",jsvGetInteger(argPtr[1]),argCount);
JsVar *oldThisVar = execInfo.thisVar;
if (thisArg)
execInfo.thisVar = jsvRef(thisArg);
else
execInfo.thisVar = jsvRef(execInfo.root); // 'this' should always default to root
void *nativePtr = jsvGetNativeFunctionPtr(function);
if (nativePtr) {
returnVar = jsnCallFunction(nativePtr, function->varData.native.argTypes, thisArg, argPtr, argCount);
} else {
assert(0); // in case something went horribly wrong
returnVar = 0;
}
// unlock values if we locked them
if (isParsing) {
while (argCount--)
jsvUnLock(argPtr[argCount]);
}
/* Return to old 'this' var. No need to unlock as we never locked before */
if (execInfo.thisVar) jsvUnRef(execInfo.thisVar);
execInfo.thisVar = oldThisVar;
} else { //if (!jsvIsNative(function))
// create a new symbol table entry for execution of this function
// OPT: can we cache this function execution environment + param variables?
// OPT: Probably when calling a function ONCE, use it, otherwise when recursing, make new?
functionRoot = jsvNewWithFlags(JSV_FUNCTION);
if (!functionRoot) { // out of memory
jspSetError(false);
return 0;
}
JsVar *functionScope = 0;
JsVar *functionCode = 0;
JsVar *functionInternalName = 0;
/** NOTE: We expect that the function object will have:
*
* * Parameters
* * Code/Scope/Name
*
* IN THAT ORDER.
*/
JsvObjectIterator it;
jsvObjectIteratorNew(&it, function);
if (isParsing) {
int hadParams = 0;
// grab in all parameters. We go around this loop until we've run out
// of named parameters AND we've parsed all the supplied arguments
while (!JSP_SHOULDNT_PARSE && execInfo.lex->tk!=')') {
JsVar *param = jsvObjectIteratorGetKey(&it);
bool paramDefined = jsvIsFunctionParameter(param);
if (execInfo.lex->tk!=')' || paramDefined) {
hadParams++;
JsVar *value = 0;
// ONLY parse this if it was supplied, otherwise leave 0 (undefined)
if (execInfo.lex->tk!=')')
value = jspeAssignmentExpression();
// and if execute, copy it over
if (JSP_SHOULD_EXECUTE) {
value = jsvSkipNameAndUnLock(value);
JsVar *paramName = paramDefined ? jsvCopy(param) : jsvNewFromEmptyString();
if (paramName) { // could be out of memory
jsvMakeFunctionParameter(paramName); // force this to be called a function parameter
jsvSetValueOfName(paramName, value);
jsvAddName(functionRoot, paramName);
jsvUnLock(paramName);
} else
jspSetError(false);
}
jsvUnLock(value);
if (execInfo.lex->tk!=')') JSP_MATCH(',');
}
jsvUnLock(param);
if (paramDefined) jsvObjectIteratorNext(&it);
}
JSP_MATCH(')');
} else if (JSP_SHOULD_EXECUTE) { // and NOT isParsing
int args = 0;
while (args<argCount) {
JsVar *param = jsvObjectIteratorGetKey(&it);
bool paramDefined = jsvIsFunctionParameter(param);
JsVar *paramName = paramDefined ? jsvCopy(param) : jsvNewFromEmptyString();
if (paramName) {
jsvMakeFunctionParameter(paramName); // force this to be called a function parameter
jsvSetValueOfName(paramName, argPtr[args]);
jsvAddName(functionRoot, paramName);
jsvUnLock(paramName);
} else
jspSetError(false);
args++;
jsvUnLock(param);
if (paramDefined) jsvObjectIteratorNext(&it);
}
}
// Now go through what's left
while (jsvObjectIteratorHasValue(&it)) {
JsVar *param = jsvObjectIteratorGetKey(&it);
if (jsvIsString(param)) {
if (jsvIsStringEqual(param, JSPARSE_FUNCTION_SCOPE_NAME)) functionScope = jsvSkipName(param);
else if (jsvIsStringEqual(param, JSPARSE_FUNCTION_CODE_NAME)) functionCode = jsvSkipName(param);
else if (jsvIsStringEqual(param, JSPARSE_FUNCTION_NAME_NAME)) functionInternalName = jsvSkipName(param);
else if (jsvIsFunctionParameter(param)) {
JsVar *paramName = jsvCopy(param);
// paramName is already a name (it's a function parameter)
if (paramName) {// could be out of memory - or maybe just not supplied!
jsvAddName(functionRoot, paramName);
jsvUnLock(paramName);
}
}
}
jsvUnLock(param);
jsvObjectIteratorNext(&it);
}
jsvObjectIteratorFree(&it);
// setup a the function's name (if a named function)
if (functionInternalName) {
JsVar *name = jsvMakeIntoVariableName(jsvNewFromStringVar(functionInternalName,0,JSVAPPENDSTRINGVAR_MAXLENGTH), function);
jsvAddName(functionRoot, name);
jsvUnLock(name);
jsvUnLock(functionInternalName);
}
// setup a return variable
returnVarName = jsvAddNamedChild(functionRoot, 0, JSPARSE_RETURN_VAR);
if (!returnVarName) // out of memory
jspSetError(false);
if (!JSP_HAS_ERROR) {
// save old scopes
JsVar *oldScopes[JSPARSE_MAX_SCOPES];
int oldScopeCount;
int i;
oldScopeCount = execInfo.scopeCount;
for (i=0;i<execInfo.scopeCount;i++)
oldScopes[i] = execInfo.scopes[i];
// if we have a scope var, load it up. We may not have one if there were no scopes apart from root
if (functionScope) {
jspeiLoadScopesFromVar(functionScope);
jsvUnLock(functionScope);
} else {
// no scope var defined? We have no scopes at all!
execInfo.scopeCount = 0;
}
// add the function's execute space to the symbol table so we can recurse
if (jspeiAddScope(functionRoot)) {
/* Adding scope may have failed - we may have descended too deep - so be sure
* not to pull somebody else's scope off
*/
JsVar *oldThisVar = execInfo.thisVar;
if (thisArg)
execInfo.thisVar = jsvRef(thisArg);
else
execInfo.thisVar = jsvRef(execInfo.root); // 'this' should always default to root
/* we just want to execute the block, but something could
* have messed up and left us with the wrong ScriptLex, so
* we want to be careful here... */
if (functionCode) {
JsLex *oldLex;
JsLex newLex;
jslInit(&newLex, functionCode);
oldLex = execInfo.lex;
execInfo.lex = &newLex;
JSP_SAVE_EXECUTE();
execInfo.execute = EXEC_YES; // force execute without any previous state
jspeBlock();
bool hasError = JSP_HAS_ERROR;
JSP_RESTORE_EXECUTE(); // because return will probably have set execute to false
jslKill(&newLex);
execInfo.lex = oldLex;
if (hasError) {
JsVar *stackTrace = jsvObjectGetChild(execInfo.hiddenRoot, JSPARSE_STACKTRACE_VAR, JSV_STRING_0);
if (stackTrace) {
jsvAppendPrintf(stackTrace, jsvIsString(functionName)?"in function %q called from ":
"in function called from ", functionName);
if (execInfo.lex) {
jspAppendStackTrace(stackTrace);
} else
jsvAppendPrintf(stackTrace, "system\n");
jsvUnLock(stackTrace);
}
}
}
/* Return to old 'this' var. No need to unlock as we never locked before */
if (execInfo.thisVar) jsvUnRef(execInfo.thisVar);
execInfo.thisVar = oldThisVar;
jspeiRemoveScope();
}
// Unref old scopes
for (i=0;i<execInfo.scopeCount;i++)
jsvUnLock(execInfo.scopes[i]);
// restore function scopes
for (i=0;i<oldScopeCount;i++)
execInfo.scopes[i] = oldScopes[i];
execInfo.scopeCount = oldScopeCount;
}
jsvUnLock(functionCode);
/* get the real return var before we remove it from our function */
returnVar = jsvSkipNameAndUnLock(returnVarName);
if (returnVarName) // could have failed with out of memory
jsvSetValueOfName(returnVarName, 0); // remove return value (which helps stops circular references)
jsvUnLock(functionRoot);
}
return returnVar;
} else if (isParsing) { // ---------------------------------- function, but not executing - just parse args and be done
jspeParseFunctionCallBrackets();
/* Do not return function, as it will be unlocked! */
return 0;
} else return 0;
}
JsVar *jspeFactorSingleId() {
JsVar *a = JSP_SHOULD_EXECUTE ? jspeiFindInScopes(jslGetTokenValueAsString(execInfo.lex)) : 0;
if (JSP_SHOULD_EXECUTE && !a) {
const char *tokenName = jslGetTokenValueAsString(execInfo.lex); // BEWARE - this won't hang around forever!
/* Special case! We haven't found the variable, so check out
* and see if it's one of our builtins... */
if (jswIsBuiltInObject(tokenName)) {
// Check if we have a built-in function for it
// OPT: Could we instead have jswIsBuiltInObjectWithoutConstructor?
JsVar *obj = jswFindBuiltInFunction(0, tokenName);
// If not, make one
if (!obj)
obj = jspNewBuiltin(tokenName);
if (obj) { // not out of memory
a = jsvAddNamedChild(execInfo.root, obj, tokenName);
jsvUnLock(obj);
}
} else {
a = jswFindBuiltInFunction(0, tokenName);
//jsiConsolePrintf("%s\n",tokenName);
if (!a) {
/* Variable doesn't exist! JavaScript says we should create it
* (we won't add it here. This is done in the assignment operator)*/
a = jsvMakeIntoVariableName(jslGetTokenValueAsVar(execInfo.lex), 0);
}
}
}
JSP_MATCH_WITH_RETURN(LEX_ID, a);
return a;
}
/// Used by jspGetNamedField / jspGetVarNamedField
static NO_INLINE JsVar *jspGetNamedFieldInParents(JsVar *object, const char* name, bool returnName) {
// Now look in prototypes
JsVar * child = jspeiFindChildFromStringInParents(object, name);
/* Check for builtins via separate function
* This way we save on RAM for built-ins because everything comes out of program code */
if (!child) {
child = jswFindBuiltInFunction(object, name);
}
/* We didn't get here if we found a child in the object itself, so
* if we're here then we probably have the wrong name - so for example
* with `a.b = c;` could end up setting `a.prototype.b` (bug #360)
*
* Also we might have got a built-in, which wouldn't have a name on it
* anyway - so in both cases, strip the name if it is there, and create
* a new name.
*/
if (child && returnName) {
// Get rid of existing name
child = jsvSkipNameAndUnLock(child);
// create a new name
JsVar *nameVar = jsvNewFromString(name);
JsVar *newChild = jsvCreateNewChild(object, nameVar, child);
jsvUnLock(nameVar);
jsvUnLock(child);
child = newChild;
}
// If not found and is the prototype, create it
if (!child) {
if (jsvIsFunction(object) && strcmp(name, JSPARSE_PROTOTYPE_VAR)==0) {
// prototype is supposed to be an object
JsVar *proto = jsvNewWithFlags(JSV_OBJECT);
// make sure it has a 'constructor' variable that points to the object it was part of
jsvObjectSetChild(proto, JSPARSE_CONSTRUCTOR_VAR, object);
child = jsvAddNamedChild(object, proto, JSPARSE_PROTOTYPE_VAR);
jspEnsureIsPrototype(object, child);
jsvUnLock(proto);
} else if (strcmp(name, JSPARSE_INHERITS_VAR)==0) {
const char *objName = jswGetBasicObjectName(object);
if (objName) {
child = jspNewPrototype(objName);
}
}
}
return child;
}
/** Get the named function/variable on the object - whether it's built in, or predefined.
* If !returnName, returns the function/variable itself or undefined, but
* if returnName, return a name (could be fake) referencing the parent.
*
* NOTE: ArrayBuffer/Strings are not handled here. We assume that if we're
* passing a char* rather than a JsVar it's because we're looking up via
* a symbol rather than a variable. To handle these use jspGetVarNamedField */
JsVar *jspGetNamedField(JsVar *object, const char* name, bool returnName) {
JsVar *child = 0;
// if we're an object (or pretending to be one)
if (jsvHasChildren(object))
child = jsvFindChildFromString(object, name, false);
if (!child) {
child = jspGetNamedFieldInParents(object, name, returnName);
// If not found and is the prototype, create it
if (!child && jsvIsFunction(object) && strcmp(name, JSPARSE_PROTOTYPE_VAR)==0) {
JsVar *value = jsvNewWithFlags(JSV_OBJECT); // prototype is supposed to be an object
child = jsvAddNamedChild(object, value, JSPARSE_PROTOTYPE_VAR);
jsvUnLock(value);
}
}
if (returnName) return child;
else return jsvSkipNameAndUnLock(child);
}
/// see jspGetNamedField - note that nameVar should have had jsvAsArrayIndex called on it first
JsVar *jspGetVarNamedField(JsVar *object, JsVar *nameVar, bool returnName) {
JsVar *child = 0;
// if we're an object (or pretending to be one)
if (jsvHasChildren(object))
child = jsvFindChildFromVar(object, nameVar, false);
if (!child) {
if (jsvIsArrayBuffer(object) && jsvIsInt(nameVar)) {
// for array buffers, we actually create a NAME, and hand that back - then when we assign (or use SkipName) we pull out the correct data
child = jsvMakeIntoVariableName(jsvNewFromInteger(jsvGetInteger(nameVar)), object);
if (child) // turn into an 'array buffer name'
child->flags = (child->flags & ~JSV_VARTYPEMASK) | JSV_ARRAYBUFFERNAME;
} else if (jsvIsString(object) && jsvIsInt(nameVar)) {
JsVarInt idx = jsvGetInteger(nameVar);
if (idx>=0 && idx<(JsVarInt)jsvGetStringLength(object)) {
child = jsvNewFromEmptyString();
if (child) jsvAppendCharacter(child, jsvGetCharInString(object, (size_t)idx));
} else if (returnName)
child = jsvNewWithFlags(JSV_NAME_STRING_0); // just return *something* to show this is handled
} else {
// get the name as a string
char name[JSLEX_MAX_TOKEN_LENGTH];
jsvGetString(nameVar, name, JSLEX_MAX_TOKEN_LENGTH);
// try and find it in parents
child = jspGetNamedFieldInParents(object, name, returnName);
// If not found and is the prototype, create it
if (!child && jsvIsFunction(object) && jsvIsStringEqual(nameVar, JSPARSE_PROTOTYPE_VAR)) {
JsVar *value = jsvNewWithFlags(JSV_OBJECT); // prototype is supposed to be an object
child = jsvAddNamedChild(object, value, JSPARSE_PROTOTYPE_VAR);
jsvUnLock(value);
}
}
}
if (returnName) return child;
else return jsvSkipNameAndUnLock(child);
}
/// Call the named function on the object - whether it's built in, or predefined. Returns the return value of the function.
JsVar *jspCallNamedFunction(JsVar *object, char* name, int argCount, JsVar **argPtr) {
JsVar *child = jspGetNamedField(object, name, false);
if (!jsvIsFunction(child)) return 0;
return jspeFunctionCall(child, 0, object, false, argCount, argPtr);
}
NO_INLINE JsVar *jspeFactorMember(JsVar *a, JsVar **parentResult) {
/* The parent if we're executing a method call */
JsVar *parent = 0;
while (execInfo.lex->tk=='.' || execInfo.lex->tk=='[') {
if (execInfo.lex->tk == '.') { // ------------------------------------- Record Access
JSP_ASSERT_MATCH('.');
if (JSP_SHOULD_EXECUTE) {
// Note: name will go away when we parse something else!
const char *name = jslGetTokenValueAsString(execInfo.lex);
JsVar *aVar = jsvSkipName(a);
JsVar *child = jspGetNamedField(aVar, name, true);
if (!child) {
if (jsvHasChildren(aVar)) {
// if no child found, create a pointer to where it could be
// as we don't want to allocate it until it's written
JsVar *nameVar = jslGetTokenValueAsVar(execInfo.lex);
child = jsvCreateNewChild(aVar, nameVar, 0);
jsvUnLock(nameVar);
} else {
// could have been a string...
jsExceptionHere(JSET_ERROR, "Field or method does not already exist, and can't create it on %t", aVar);
}
}
JSP_MATCH_WITH_CLEANUP_AND_RETURN(LEX_ID, jsvUnLock(parent);jsvUnLock(a);jsvUnLock(aVar);, child);
jsvUnLock(parent);
parent = aVar;
jsvUnLock(a);
a = child;
} else {
// Not executing, just match
JSP_MATCH_WITH_RETURN(LEX_ID, a);
}
} else if (execInfo.lex->tk == '[') { // ------------------------------------- Array Access
JsVar *index;
JSP_ASSERT_MATCH('[');
index = jsvSkipNameAndUnLock(jspeAssignmentExpression());
JSP_MATCH_WITH_CLEANUP_AND_RETURN(']', jsvUnLock(parent);jsvUnLock(index);, a);
if (JSP_SHOULD_EXECUTE) {
index = jsvAsArrayIndexAndUnLock(index);
JsVar *aVar = jsvSkipName(a);
JsVar *child = jspGetVarNamedField(aVar, index, true);
if (!child) {
if (jsvHasChildren(aVar)) {
// if no child found, create a pointer to where it could be
// as we don't want to allocate it until it's written
child = jsvCreateNewChild(aVar, index, 0);
} else {
jsExceptionHere(JSET_ERROR, "Field or method does not already exist, and can't create it on %t", aVar);
}
}
jsvUnLock(parent);
parent = jsvLockAgainSafe(aVar);
jsvUnLock(a);
a = child;
jsvUnLock(aVar);
}
jsvUnLock(index);
} else {
assert(0);
}
}
if (parentResult) *parentResult = parent;
else jsvUnLock(parent);
return a;
}
NO_INLINE JsVar *jspeConstruct(JsVar *func, JsVar *funcName, bool hasArgs) {
assert(JSP_SHOULD_EXECUTE);
if (!jsvIsFunction(func)) {
jsExceptionHere(JSET_ERROR, "Constructor should be a function, but is %t", func);
return 0;
}
JsVar *thisObj = jsvNewWithFlags(JSV_OBJECT);
if (!thisObj) return 0; // out of memory
// Make sure the function has a 'prototype' var
JsVar *prototypeName = jsvFindChildFromString(func, JSPARSE_PROTOTYPE_VAR, true);
jspEnsureIsPrototype(func, prototypeName); // make sure it's an object
JsVar *prototypeVar = jsvSkipName(prototypeName);
jsvUnLock(jsvAddNamedChild(thisObj, prototypeVar, JSPARSE_INHERITS_VAR));
jsvUnLock(prototypeVar);
jsvUnLock(prototypeName);
JsVar *a = jspeFunctionCall(func, funcName, thisObj, hasArgs, 0, 0);
if (a) {
jsvUnLock(thisObj);
thisObj = a;
} else {
jsvUnLock(a);
}
return thisObj;
}
NO_INLINE JsVar *jspeFactorFunctionCall() {
/* The parent if we're executing a method call */
bool isConstructor = false;
if (execInfo.lex->tk==LEX_R_NEW) {
JSP_ASSERT_MATCH(LEX_R_NEW);
isConstructor = true;
if (execInfo.lex->tk==LEX_R_NEW) {
jsExceptionHere(JSET_ERROR, "Nesting 'new' operators is unsupported");
jspSetError(false);
return 0;
}
}
JsVar *parent = 0;
JsVar *a = jspeFactorMember(jspeFactor(), &parent);
while ((execInfo.lex->tk=='(' || (isConstructor && JSP_SHOULD_EXECUTE)) && !jspIsInterrupted()) {
JsVar *funcName = a;
JsVar *func = jsvSkipName(funcName);
/* The constructor function doesn't change parsing, so if we're
* not executing, just short-cut it. */
if (isConstructor && JSP_SHOULD_EXECUTE) {
// If we have '(' parse an argument list, otherwise don't look for any args
bool parseArgs = execInfo.lex->tk=='(';
a = jspeConstruct(func, funcName, parseArgs);
isConstructor = false; // don't treat subsequent brackets as constructors
} else{
//jsiConsolePrintf("before call jspeFactorFunctionCall()\n");
a = jspeFunctionCall(func, funcName, parent, true, 0, 0);
}
jsvUnLock(funcName);
jsvUnLock(func);
jsvUnLock(parent); parent=0;
a = jspeFactorMember(a, &parent);
}
jsvUnLock(parent);
return a;
}
JsVar *jspeFactorId() {
return jspeFactorSingleId();
}
NO_INLINE JsVar *jspeFactorObject() {
if (JSP_SHOULD_EXECUTE) {
JsVar *contents = jsvNewWithFlags(JSV_OBJECT);
if (!contents) { // out of memory
jspSetError(false);
return 0;
}
/* JSON-style object definition */
JSP_MATCH_WITH_RETURN('{', contents);
while (!JSP_SHOULDNT_PARSE && execInfo.lex->tk != '}') {