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https://github.com/mozilla/gecko-dev.git
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550 lines
20 KiB
C++
550 lines
20 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is the JavaScript 2 Prototype.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU Public License (the "GPL"), in which case the
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* provisions of the GPL are applicable instead of those above.
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* If you wish to allow use of your version of this file only
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* under the terms of the GPL and not to allow others to use your
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* version of this file under the NPL, indicate your decision by
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* deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL. If you do not delete
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* the provisions above, a recipient may use your version of this
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* file under either the NPL or the GPL.
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*/
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#include <stdio.h>
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#include "icodeasm.h"
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#include "icodemap.h"
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#include "utilities.h"
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#include "lexutils.h"
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#include "exception.h"
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namespace JavaScript {
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namespace ICodeASM {
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using namespace LexUtils;
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static char *keyword_offset = "offset";
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static char *keyword_exprNodeKinds[] = {"add", "subtract", "multiply", "divide",
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"remainder", "leftshift", "rightshift",
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"logicalrightshift", "bitwiseor",
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"bitwisexor", "bitwiseand", "less",
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"lessorequal", "equal", "identical", 0};
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static ExprNode::Kind exprNodeOps[] =
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{ ExprNode::add, ExprNode::subtract, ExprNode::multiply, ExprNode::divide,
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ExprNode::modulo, ExprNode::leftShift, ExprNode::rightShift,
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ExprNode::logicalRightShift, ExprNode::bitwiseOr,
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ExprNode::bitwiseXor, ExprNode::bitwiseAnd, ExprNode::lessThan,
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ExprNode::lessThanOrEqual, ExprNode::equal, ExprNode::identical };
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void
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ICodeParser::parseSourceFromString (const string8 &source)
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{
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uint statementNo = 0;
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string8_citer begin = source.begin();
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string8_citer end = source.end();
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mInstructions = new VM::InstructionStream();
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mMaxRegister = 0;
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mInstructionCount = 0;
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mLabels.clear();
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mNamedLabels.clear();
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while (begin < end)
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{
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try
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{
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++statementNo;
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begin = parseNextStatement (begin, end);
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}
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catch (JSException &e)
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{
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string8 etext;
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e.toString8(etext);
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fprintf (stderr, "%s at statement %u\n",
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etext.c_str(), statementNo);
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return;
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}
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}
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if (begin > end)
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NOT_REACHED ("Overran source buffer!");
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}
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/**********************************************************************
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* operand parse functions (see comment in the .h file) ...
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*/
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string8_citer
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ICodeParser::parseArgumentListOperand (string8_citer begin,
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string8_citer end,
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VM::ArgumentList **rval)
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{
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/* parse argument list on the format "(['argname': ]register[, ...])" */
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TokenLocation tl = seekTokenStart (begin, end);
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VM::ArgumentList *al = new VM::ArgumentList();
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if (tl.estimate != teOpenParen)
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throw JSParseException (eidExpectArgList);
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tl = seekTokenStart (tl.begin + 1, end);
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StringFormatter s_fmt;
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while (tl.estimate == teString || tl.estimate == teAlpha) {
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string *argName = 0;
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if (tl.estimate == teString) {
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/* look for the argname in quotes */
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begin = lexString8 (tl.begin, end, &argName);
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/* look for the : */
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tl = seekTokenStart (begin, end);
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if (tl.estimate != teColon)
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throw JSParseException (eidExpectColon);
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/* and now the register */
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tl = seekTokenStart (tl.begin + 1, end);
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}
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if (tl.estimate != teAlpha)
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throw JSParseException (eidExpectRegister);
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JSTypes::Register r;
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begin = lexRegister (tl.begin, end, &r);
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if (r != VM::NotARegister && r > mMaxRegister)
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mMaxRegister = r;
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/* pass 0 (null) as the "type" because it is
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* not actually used by the interpreter, only in (the current)
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* codegen (acording to rogerl.)
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*/
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VM::TypedRegister tr = VM::TypedRegister(r, 0);
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StringAtom *sap = 0;
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if (argName) {
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sap = &(mCx->getWorld().identifiers[argName->c_str()]);
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delete argName;
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}
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else {
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/* if an argument name was not specified, use the position
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* to build a default name.
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*/
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s_fmt << (uint32)al->size();
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sap = &(mCx->getWorld().identifiers[s_fmt.getString()]);
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s_fmt.clear();
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}
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VM::Argument arg = VM::Argument (tr, sap);
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al->push_back(arg);
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tl = seekTokenStart (begin, end);
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/* if the next token is a comma,
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* seek to the next one and go again */
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if (tl.estimate == teComma) {
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tl = seekTokenStart (tl.begin + 1, end);
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}
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}
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if (tl.estimate != teCloseParen)
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throw JSParseException (eidExpectCloseParen);
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*rval = al;
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return tl.begin + 1;
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}
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string8_citer
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ICodeParser::parseExprNodeKindOperand (string8_citer begin, string8_citer end,
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ExprNode::Kind *rval)
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{
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TokenLocation tl = seekTokenStart (begin, end);
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if (tl.estimate != teAlpha)
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throw JSParseException (eidExpectBinaryOp);
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string8 *str;
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end = lexAlpha (tl.begin, end, &str);
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for (int i = 0; keyword_exprNodeKinds[i] != 0; ++i)
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if (cmp_nocase (*str, keyword_exprNodeKinds[i], keyword_exprNodeKinds[i] +
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strlen (keyword_exprNodeKinds[i])) == 0) {
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*rval = exprNodeOps[i];
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delete str;
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return end;
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}
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delete str;
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throw JSParseException (eidUnknownBinaryOp);
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}
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string8_citer
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ICodeParser::parseBoolOperand (string8_citer begin, string8_citer end,
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bool *rval)
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{
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TokenLocation tl = seekTokenStart (begin, end);
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if (tl.estimate != teAlpha)
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throw JSParseException (eidExpectBool);
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return lexBool (tl.begin, end, rval);
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}
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string8_citer
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ICodeParser::parseDoubleOperand (string8_citer begin, string8_citer end,
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double *rval)
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{
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TokenLocation tl = seekTokenStart (begin, end);
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if ((tl.estimate != teNumeric) && (tl.estimate != teMinus) &&
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(tl.estimate != tePlus))
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throw JSParseException (eidExpectDouble);
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return lexDouble (tl.begin, end, rval);
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}
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string8_citer
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ICodeParser::parseICodeModuleOperand (string8_citer begin,
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string8_citer end,
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VM::ICodeModule **rval)
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{
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TokenLocation tl = seekTokenStart (begin, end);
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if (tl.estimate != teString)
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throw JSParseException (eidExpectString);
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string8 *str;
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end = lexString8 (tl.begin, end, &str);
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StringAtom &typename_atom = mCx->getWorld().identifiers[str->c_str()];
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delete str;
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JSTypes::JSValue jsv =
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mCx->getGlobalObject()->getVariable(typename_atom);
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if (!jsv.isFunction()) {
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ASSERT(false);
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}
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*rval = jsv.function->getICode();
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return end;
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// NOT_REACHED ("ICode modules are hard, lets go shopping.");
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// return end;
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}
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string8_citer
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ICodeParser::parseJSClassOperand (string8_citer begin,
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string8_citer end, JSTypes::JSType **rval)
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{
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TokenLocation tl = seekTokenStart (begin, end);
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if (tl.estimate != teString)
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throw JSParseException (eidExpectString);
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string8 *str;
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end = lexString8 (tl.begin, end, &str);
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StringAtom &typename_atom = mCx->getWorld().identifiers[str->c_str()];
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delete str;
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JSTypes::JSValue jsv =
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mCx->getGlobalObject()->getVariable(typename_atom);
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if (jsv.isType())
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*rval = jsv.type;
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else
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*rval = &(JSTypes::Any_Type);
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return end;
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// NOT_REACHED ("JSClasses are hard, lets go shopping.");
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// return end;
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}
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string8_citer
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ICodeParser::parseJSStringOperand (string8_citer begin, string8_citer end,
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JSTypes::JSString **rval)
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{
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TokenLocation tl = seekTokenStart (begin, end);
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if (tl.estimate != teString)
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throw JSParseException (eidExpectString);
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string8 *str;
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end = lexString8 (tl.begin, end, &str);
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*rval = new JSTypes::JSString (str->c_str());
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delete str;
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return end;
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}
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string8_citer
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ICodeParser::parseJSFunctionOperand (string8_citer /*begin*/,
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string8_citer end,
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string ** /*rval*/)
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{
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NOT_REACHED ("JSFunctions are hard, lets go shopping.");
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return end;
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}
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string8_citer
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ICodeParser::parseJSTypeOperand (string8_citer begin, string8_citer end,
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JSTypes::JSType **rval)
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{
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TokenLocation tl = seekTokenStart (begin, end);
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if (tl.estimate != teString)
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throw JSParseException (eidExpectString);
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string8 *str;
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end = lexString8 (tl.begin, end, &str);
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StringAtom &typename_atom = mCx->getWorld().identifiers[str->c_str()];
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delete str;
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JSTypes::JSValue jsv =
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mCx->getGlobalObject()->getVariable(typename_atom);
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if (jsv.isType())
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*rval = jsv.type;
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else
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*rval = &(JSTypes::Any_Type);
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return end;
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}
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string8_citer
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ICodeParser::parseLabelOperand (string8_citer begin, string8_citer end,
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VM::Label **rval)
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{
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TokenLocation tl = seekTokenStart (begin, end);
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if (tl.estimate != teAlpha)
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throw JSParseException (eidExpectLabel);
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string8 *str;
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begin = lexAlpha (tl.begin, end, &str);
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if (cmp_nocase(*str, keyword_offset, keyword_offset +
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strlen(keyword_offset)) == 0) {
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delete str;
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/* got the "Offset" keyword, treat next thing as a jump offset
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* expressed as "Offset +/-N" */
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tl = seekTokenStart (begin, end);
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if (tl.estimate != teNumeric)
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throw JSParseException (eidExpectUInt32);
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uint32 ofs;
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begin = lexUInt32 (tl.begin, end, &ofs);
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VM::Label *new_label = new VM::Label(mInstructions);
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new_label->mOffset = ofs;
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mLabels.push_back (new_label);
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*rval = new_label;
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} else {
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/* label expressed as "label_name", look for it in the
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* namedlabels map */
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LabelMap::const_iterator l = mNamedLabels.find(str->c_str());
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if (l != mNamedLabels.end()) {
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/* found the label, use it */
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*rval = (*l).second;
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} else {
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/* havn't seen the label definition yet, put a placeholder
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* in the namedlabels map */
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VM::Label *new_label = new VM::Label(mInstructions);
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new_label->mOffset = VM::NotALabel;
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*rval = new_label;
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mNamedLabels[str->c_str()] = new_label;
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mLabels.push_back (new_label);
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}
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delete str;
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}
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return begin;
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}
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string8_citer
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ICodeParser::parseUInt32Operand (string8_citer begin,
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string8_citer end, uint32 *rval)
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{
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TokenLocation tl = seekTokenStart (begin, end);
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if (tl.estimate != teNumeric)
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throw JSParseException (eidExpectUInt32);
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return lexUInt32 (tl.begin, end, rval);
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}
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string8_citer
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ICodeParser::parseRegisterOperand (string8_citer begin, string8_citer end,
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JSTypes::Register *rval)
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{
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TokenLocation tl = seekTokenStart (begin, end);
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end = lexRegister (tl.begin, end, rval);
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if (*rval != VM::NotARegister && *rval > mMaxRegister)
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mMaxRegister = *rval;
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return end;
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}
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string8_citer
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ICodeParser::parseStringAtomOperand (string8_citer begin, string8_citer end,
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StringAtom **rval)
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{
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TokenLocation tl = seekTokenStart (begin, end);
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if (tl.estimate != teString)
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throw JSParseException (eidExpectString);
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string8 *str;
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end = lexString8 (tl.begin, end, &str);
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*rval = &(mCx->getWorld().identifiers[str->c_str()]);
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delete str;
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return end;
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}
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/* "High Level" parse functions ... */
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string8_citer
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ICodeParser::parseInstruction (uint icodeID, string8_citer begin,
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string8_citer end)
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{
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string8_citer curpos = begin;
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StatementNode node;
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node.icodeID = icodeID;
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# define CASE_TYPE(T, C, CTYPE) \
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case ot##T: \
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{ \
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C rval; \
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node.operand[i].type = ot##T; \
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curpos = parse##T##Operand (curpos, end, &rval); \
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node.operand[i].data = CTYPE<int64>(rval); \
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break; \
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}
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for (uint i = 0; i < 4; ++i)
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{
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switch (icodemap[icodeID].otype[i])
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{
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CASE_TYPE(ArgumentList, VM::ArgumentList *, reinterpret_cast);
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CASE_TYPE(ExprNodeKind, ExprNode::Kind, static_cast);
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CASE_TYPE(Bool, bool, static_cast);
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CASE_TYPE(Double, double, static_cast);
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CASE_TYPE(ICodeModule, VM::ICodeModule *, reinterpret_cast);
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CASE_TYPE(JSClass, JSTypes::JSType *, reinterpret_cast);
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CASE_TYPE(JSString, JSTypes::JSString *, reinterpret_cast);
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CASE_TYPE(JSFunction, string *, reinterpret_cast);
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CASE_TYPE(JSType, JSTypes::JSType *, reinterpret_cast);
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CASE_TYPE(Label, VM::Label *, reinterpret_cast);
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CASE_TYPE(UInt32, uint32, static_cast);
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CASE_TYPE(Register, JSTypes::Register, static_cast);
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CASE_TYPE(StringAtom, StringAtom *, reinterpret_cast);
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default:
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node.operand[i].type = otNone;
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break;
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}
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if (i != 3 && icodemap[icodeID].otype[i + 1] != otNone) {
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/* if the instruction has more arguments, eat a comma and
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* locate the next token */
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TokenLocation tl = seekTokenStart (curpos, end);
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if (tl.estimate != teComma)
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throw JSParseException (eidExpectComma);
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tl = seekTokenStart (tl.begin + 1, end);
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curpos = tl.begin;
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}
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}
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# undef CASE_TYPE
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mInstructions->push_back (InstructionFromNode(&node));
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++mInstructionCount;
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TokenLocation tl = seekTokenStart (curpos, end);
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if (tl.estimate != teNewline && tl.estimate != teEOF)
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throw JSParseException (eidExpectNewline);
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if (tl.estimate == teEOF)
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return tl.begin;
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else
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return tl.begin + 1;
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}
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string8_citer
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ICodeParser::parseNextStatement (string8_citer begin, string8_citer end)
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{
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bool isLabel = false;
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string8_citer firstTokenEnd = end;
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TokenLocation tl = seekTokenStart (begin, end);
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if (tl.estimate == teNewline) {
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/* empty statement, do nothing */
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return tl.begin + 1;
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}
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if (tl.estimate != teAlpha)
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throw JSParseException (eidExpectIdentifier);
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for (string8_citer curpos = tl.begin; curpos < end; ++curpos) {
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switch (*curpos)
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{
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case ':':
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isLabel = true;
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firstTokenEnd = ++curpos;
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goto scan_done;
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default:
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if (!IS_ALPHA(*curpos)) {
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firstTokenEnd = curpos;
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goto scan_done;
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}
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}
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}
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scan_done:
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if (isLabel) {
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/* the thing we scanned was a label...
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* ignore the trailing : */
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string8 label_str(tl.begin, firstTokenEnd - 1);
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/* check to see if it was already referenced... */
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LabelMap::const_iterator l = mNamedLabels.find(label_str.c_str());
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if (l == mNamedLabels.end()) {
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/* if it wasn't already referenced, add it */
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VM::Label *new_label = new VM::Label (mInstructions);
|
|
new_label->mOffset = mInstructionCount;
|
|
mNamedLabels[label_str.c_str()] = new_label;
|
|
mLabels.push_back(new_label);
|
|
} else {
|
|
/* if it was already referenced, check to see if the offset
|
|
* was already set */
|
|
if ((*l).second->mOffset == VM::NotALabel) {
|
|
/* offset not set yet, set it and move along */
|
|
(*l).second->mOffset = mInstructionCount;
|
|
} else {
|
|
/* offset was already set, this must be a dupe! */
|
|
throw JSParseException (eidDuplicateLabel);
|
|
}
|
|
}
|
|
} else {
|
|
/* the thing we scanned was an instruction, search the icode map
|
|
* for a matching instruction */
|
|
string8 icode_str(tl.begin, firstTokenEnd);
|
|
for (uint i = 0; i < icodemap_size; ++i)
|
|
if (cmp_nocase(icode_str, &icodemap[i].name[0],
|
|
&icodemap[i].name[0] +
|
|
strlen(icodemap[i].name)) == 0)
|
|
/* if match found, parse it's operands */
|
|
return parseInstruction (i, firstTokenEnd, end);
|
|
/* otherwise, choke on it */
|
|
throw JSParseException (eidUnknownICode);
|
|
}
|
|
return firstTokenEnd;
|
|
}
|
|
|
|
}
|
|
}
|