X-Git-Url: https://git.saurik.com/cycript.git/blobdiff_plain/4de0686f54039cd5211daebcf5a51ad475594170..c30687a7155e8c96310eaddd8213f6d3a69cab0e:/Replace.cpp

diff --git a/Replace.cpp b/Replace.cpp
index 987122b..c06c2a5 100644
--- a/Replace.cpp
+++ b/Replace.cpp
@@ -1,8 +1,76 @@
+/* Cycript - Inlining/Optimizing JavaScript Compiler
+ * Copyright (C) 2009  Jay Freeman (saurik)
+*/
+
+/* Modified BSD License {{{ */
+/*
+ *        Redistribution and use in source and binary
+ * forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the
+ *    above copyright notice, this list of conditions
+ *    and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the
+ *    above copyright notice, this list of conditions
+ *    and the following disclaimer in the documentation
+ *    and/or other materials provided with the
+ *    distribution.
+ * 3. The name of the author may not be used to endorse
+ *    or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/* }}} */
+
 #include "Parser.hpp"
+#include "Replace.hpp"
 
 #include <iomanip>
 
-#include "Replace.hpp"
+CYExpression *CYAdd::Replace(CYContext &context) {
+    CYInfix::Replace(context);
+
+    CYExpression *lhp(lhs_->Primitive(context));
+    CYExpression *rhp(rhs_->Primitive(context));
+
+    CYString *lhs(dynamic_cast<CYString *>(lhp));
+    CYString *rhs(dynamic_cast<CYString *>(rhp));
+
+    if (lhs != NULL || rhs != NULL) {
+        if (lhs == NULL) {
+            lhs = lhp->String(context);
+            if (lhs == NULL)
+                return this;
+        } else if (rhs == NULL) {
+            rhs = rhp->String(context);
+            if (rhs == NULL)
+                return this;
+        }
+
+        return lhs->Concat(context, rhs);
+    }
+
+    if (CYNumber *lhn = lhp->Number(context))
+        if (CYNumber *rhn = rhp->Number(context))
+            return $D(lhn->Value() + rhn->Value());
+
+    return this;
+}
 
 CYExpression *CYAddressOf::Replace(CYContext &context) {
     CYPrefix::Replace(context);
@@ -16,7 +84,7 @@ void CYArgument::Replace(CYContext &context) { $T()
 
 CYExpression *CYArray::Replace(CYContext &context) {
     elements_->Replace(context);
-    return NULL;
+    return this;
 }
 
 CYExpression *CYArrayComprehension::Replace(CYContext &context) {
@@ -32,37 +100,48 @@ CYExpression *CYArrayComprehension::Replace(CYContext &context) {
 CYExpression *CYAssignment::Replace(CYContext &context) {
     context.Replace(lhs_);
     context.Replace(rhs_);
-    return NULL;
+    return this;
 }
 
 CYStatement *CYBlock::Replace(CYContext &context) {
     statements_ = statements_->ReplaceAll(context);
-    return NULL;
+    if (statements_ == NULL)
+        return $ CYEmpty();
+    return this;
 }
 
 CYStatement *CYBreak::Replace(CYContext &context) {
-    return NULL;
+    return this;
 }
 
 CYExpression *CYCall::Replace(CYContext &context) {
     context.Replace(function_);
     arguments_->Replace(context);
-    return NULL;
+    return this;
 }
 
-void CYCatch::Replace(CYContext &context) { $T()
+namespace cy {
+namespace Syntax {
+
+void Catch::Replace(CYContext &context) { $T()
     code_.Replace(context);
 }
 
+} }
+
 void CYClause::Replace(CYContext &context) { $T()
     context.Replace(case_);
     statements_ = statements_->ReplaceAll(context);
     next_->Replace(context);
 }
 
+CYStatement *CYComment::Replace(CYContext &context) {
+    return this;
+}
+
 CYExpression *CYCompound::Replace(CYContext &context) {
     expressions_ = expressions_->ReplaceAll(context);
-    return NULL;
+    return expressions_ == NULL ? NULL : this;
 }
 
 CYFunctionParameter *CYComprehension::Parameters(CYContext &context) const { $T(NULL)
@@ -82,35 +161,56 @@ CYExpression *CYCondition::Replace(CYContext &context) {
     context.Replace(test_);
     context.Replace(true_);
     context.Replace(false_);
-    return NULL;
+    return this;
 }
 
 CYStatement *CYContinue::Replace(CYContext &context) {
-    return NULL;
+    return this;
+}
+
+CYAssignment *CYDeclaration::Assignment(CYContext &context) {
+    CYExpression *variable(Replace(context));
+    return initialiser_ == NULL ? NULL : $ CYAssign(variable, initialiser_);
 }
 
 CYExpression *CYDeclaration::ForEachIn(CYContext &context) {
     return $ CYVariable(identifier_);
 }
 
-void CYDeclaration::Replace(CYContext &context) {
-    context.Replace(initialiser_);
+CYExpression *CYDeclaration::Replace(CYContext &context) {
+    context.Replace(identifier_);
+    context.scope_->Declare(context, identifier_, CYIdentifierVariable);
+    return $ CYVariable(identifier_);
 }
 
-void CYDeclarations::Replace(CYContext &context) { $T()
-    declaration_->Replace(context);
-    next_->Replace(context);
+CYProperty *CYDeclarations::Property(CYContext &context) { $T(NULL)
+    return $ CYProperty(declaration_->identifier_, declaration_->initialiser_ ?: $U, next_->Property(context));
+}
+
+CYCompound *CYDeclarations::Replace(CYContext &context) {
+    CYCompound *compound;
+    if (next_ == NULL) compound:
+        compound = $ CYCompound();
+    else {
+        compound = next_->Replace(context);
+        if (compound == NULL)
+            goto compound;
+    }
+
+    if (CYAssignment *assignment = declaration_->Assignment(context))
+        compound->AddPrev(assignment);
+    return compound;
 }
 
 CYExpression *CYDirectMember::Replace(CYContext &context) {
     Replace_(context);
-    return NULL;
+    return this;
 }
 
 CYStatement *CYDoWhile::Replace(CYContext &context) {
     context.Replace(test_);
     context.Replace(code_);
-    return NULL;
+    return this;
 }
 
 void CYElement::Replace(CYContext &context) { $T()
@@ -118,13 +218,32 @@ void CYElement::Replace(CYContext &context) { $T()
     next_->Replace(context);
 }
 
+CYStatement *CYEmpty::Collapse(CYContext &context) {
+    return next_;
+}
+
 CYStatement *CYEmpty::Replace(CYContext &context) {
-    return NULL;
+    return this;
+}
+
+CYStatement *CYExpress::Collapse(CYContext &context) {
+    if (CYExpress *express = dynamic_cast<CYExpress *>(next_)) {
+        CYCompound *next(dynamic_cast<CYCompound *>(express->expression_));
+        if (next == NULL)
+            next = $ CYCompound(express->expression_);
+        next->AddPrev(expression_);
+        expression_ = next;
+        SetNext(express->next_);
+    }
+
+    return this;
 }
 
 CYStatement *CYExpress::Replace(CYContext &context) {
     context.Replace(expression_);
-    return NULL;
+    if (expression_ == NULL)
+        return $ CYEmpty();
+    return this;
 }
 
 CYExpression *CYExpression::ClassName(CYContext &context, bool object) {
@@ -147,23 +266,32 @@ CYExpression *CYExpression::ReplaceAll(CYContext &context) { $T(NULL)
     return replace;
 }
 
+CYNumber *CYFalse::Number(CYContext &context) {
+    return $D(0);
+}
+
+CYString *CYFalse::String(CYContext &context) {
+    return $S("false");
+}
+
 void CYFinally::Replace(CYContext &context) { $T()
     code_.Replace(context);
 }
 
 CYStatement *CYFor::Replace(CYContext &context) {
-    // XXX: initialiser_
+    context.Replace(initialiser_);
     context.Replace(test_);
     context.Replace(increment_);
     context.Replace(code_);
-    return NULL;
+    return this;
 }
 
 CYStatement *CYForIn::Replace(CYContext &context) {
-    // XXX: initialiser_
+    // XXX: this actually might need a prefix statement
+    context.Replace(initialiser_);
     context.Replace(set_);
     context.Replace(code_);
-    return NULL;
+    return this;
 }
 
 CYFunctionParameter *CYForInComprehension::Parameter(CYContext &context) const {
@@ -177,13 +305,12 @@ CYStatement *CYForInComprehension::Replace(CYContext &context, CYStatement *stat
 CYStatement *CYForEachIn::Replace(CYContext &context) {
     CYVariable *cys($V("$cys")), *cyt($V("$cyt"));
 
-    return $ CYWith($ CYObject($ CYProperty($S("$cys"), $D(0), $ CYProperty($S("$cyt"), $D(0)))), $ CYBlock($$->*
-        $E($ CYAssign(cys, set_))->*
+    return $ CYLet($L2($L($I("$cys"), set_), $L($I("$cyt"))), $$->*
         $ CYForIn(cyt, cys, $ CYBlock($$->*
             $E($ CYAssign(initialiser_->ForEachIn(context), $M(cys, cyt)))->*
             code_
         ))
-    ));
+    );
 }
 
 CYFunctionParameter *CYForEachInComprehension::Parameter(CYContext &context) const {
@@ -202,25 +329,57 @@ CYStatement *CYForEachInComprehension::Replace(CYContext &context, CYStatement *
     )));
 }
 
-void CYFunction::Replace_(CYContext &context) {
+void CYFunction::Inject(CYContext &context) {
+    context.Replace(name_);
+    context.scope_->Declare(context, name_, CYIdentifierOther);
+}
+
+void CYFunction::Replace_(CYContext &context, bool outer) {
+    if (outer)
+        Inject(context);
+
+    CYScope scope;
+    scope.parent_ = context.scope_;
+    context.scope_ = &scope;
+
+    if (!outer && name_ != NULL)
+        Inject(context);
+
+    parameters_->Replace(context);
     code_.Replace(context);
+
+    context.scope_ = scope.parent_;
+    scope.Scope(context, code_.statements_);
 }
 
 CYExpression *CYFunctionExpression::Replace(CYContext &context) {
-    Replace_(context);
-    return NULL;
+    Replace_(context, false);
+    return this;
+}
+
+void CYFunctionParameter::Replace(CYContext &context) { $T()
+    name_ = name_->Replace(context);
+    context.scope_->Declare(context, name_, CYIdentifierArgument);
+    next_->Replace(context);
 }
 
 CYStatement *CYFunctionStatement::Replace(CYContext &context) {
-    Replace_(context);
-    return NULL;
+    Replace_(context, true);
+    return this;
+}
+
+CYIdentifier *CYIdentifier::Replace(CYContext &context) {
+    if (replace_ != NULL && replace_ != this)
+        return replace_->Replace(context);
+    replace_ = context.scope_->Lookup(context, this);
+    return replace_;
 }
 
 CYStatement *CYIf::Replace(CYContext &context) {
     context.Replace(test_);
     context.Replace(true_);
     context.Replace(false_);
-    return NULL;
+    return this;
 }
 
 CYFunctionParameter *CYIfComprehension::Parameter(CYContext &context) const {
@@ -244,12 +403,16 @@ CYExpression *CYIndirectMember::Replace(CYContext &context) {
 CYExpression *CYInfix::Replace(CYContext &context) {
     context.Replace(lhs_);
     context.Replace(rhs_);
-    return NULL;
+    return this;
 }
 
 CYStatement *CYLabel::Replace(CYContext &context) {
     context.Replace(statement_);
-    return NULL;
+    return this;
+}
+
+CYStatement *CYLet::Replace(CYContext &context) {
+    return $ CYWith($ CYObject(declarations_->Property(context)), &code_);
 }
 
 void CYMember::Replace_(CYContext &context) {
@@ -260,26 +423,112 @@ void CYMember::Replace_(CYContext &context) {
 CYExpression *CYNew::Replace(CYContext &context) {
     context.Replace(constructor_);
     arguments_->Replace(context);
-    return NULL;
+    return this;
+}
+
+CYNumber *CYNull::Number(CYContext &context) {
+    return $D(0);
+}
+
+CYString *CYNull::String(CYContext &context) {
+    return $S("null");
+}
+
+CYNumber *CYNumber::Number(CYContext &context) {
+    return this;
+}
+
+CYString *CYNumber::String(CYContext &context) {
+    // XXX: there is a precise algorithm for this
+    return $S(apr_psprintf(context.pool_, "%.17g", Value()));
 }
 
 CYExpression *CYObject::Replace(CYContext &context) {
     properties_->Replace(context);
-    return NULL;
+    return this;
 }
 
 CYExpression *CYPostfix::Replace(CYContext &context) {
     context.Replace(lhs_);
-    return NULL;
+    return this;
 }
 
 CYExpression *CYPrefix::Replace(CYContext &context) {
     context.Replace(rhs_);
-    return NULL;
+    return this;
+}
+
+// XXX: this is evil evil black magic. don't ask, don't tell... don't believe!
+#define MappingSet "0etnirsoalfucdphmgyvbxTwSNECAFjDLkMOIBPqzRH$_WXUVGYKQJZ"
+//#define MappingSet "0abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_"
+
+namespace {
+    struct IdentifierUsageLess :
+        std::binary_function<CYIdentifier *, CYIdentifier *, bool>
+    {
+        _finline bool operator ()(CYIdentifier *lhs, CYIdentifier *rhs) const {
+            if (lhs->usage_ != rhs->usage_)
+                return lhs->usage_ > rhs->usage_;
+            return lhs < rhs;
+        }
+    };
+
+    typedef std::set<CYIdentifier *, IdentifierUsageLess> IdentifierUsages;
 }
 
 void CYProgram::Replace(CYContext &context) {
+    CYScope scope;
+    scope.parent_ = context.scope_;
+    context.scope_ = &scope;
     statements_ = statements_->ReplaceAll(context);
+    context.scope_ = scope.parent_;
+    scope.Scope(context, statements_);
+
+    size_t offset(0);
+
+    CYCStringSet external;
+    for (CYIdentifierValueSet::const_iterator i(scope.identifiers_.begin()); i != scope.identifiers_.end(); ++i)
+        external.insert((*i)->Word());
+
+    IdentifierUsages usages;
+
+    if (offset < context.rename_.size())
+        for (CYIdentifier *i(context.rename_[offset].identifier_); i != NULL; i = i->next_)
+             usages.insert(i);
+
+    // XXX: totalling the probable occurrences and sorting by them would improve the result
+    for (CYIdentifierUsageVector::const_iterator i(context.rename_.begin()); i != context.rename_.end(); ++i, ++offset) {
+        //std::cout << *i << ":" << (*i)->offset_ << std::endl;
+
+        const char *name;
+
+        if (context.options_.verbose_)
+            name = apr_psprintf(context.pool_, "$%"APR_SIZE_T_FMT"", offset);
+        else {
+            char id[8];
+            id[7] = '\0';
+
+          id:
+            unsigned position(7), local(offset + 1);
+
+            do {
+                unsigned index(local % (sizeof(MappingSet) - 1));
+                local /= sizeof(MappingSet) - 1;
+                id[--position] = MappingSet[index];
+            } while (local != 0);
+
+            if (external.find(id + position) != external.end()) {
+                ++offset;
+                goto id;
+            }
+
+            name = apr_pstrmemdup(context.pool_, id + position, 7 - position);
+            // XXX: at some point, this could become a keyword
+        }
+
+        for (CYIdentifier *identifier(i->identifier_); identifier != NULL; identifier = identifier->next_)
+            identifier->Set(name);
+    }
 }
 
 void CYProperty::Replace(CYContext &context) { $T()
@@ -289,66 +538,203 @@ void CYProperty::Replace(CYContext &context) { $T()
 
 CYStatement *CYReturn::Replace(CYContext &context) {
     context.Replace(value_);
-    return NULL;
+    return this;
+}
+
+void CYScope::Declare(CYContext &context, CYIdentifier *identifier, CYIdentifierFlags flags) {
+    internal_.insert(CYIdentifierAddressFlagsMap::value_type(identifier, flags));
+}
+
+CYIdentifier *CYScope::Lookup(CYContext &context, CYIdentifier *identifier) {
+    std::pair<CYIdentifierValueSet::iterator, bool> insert(identifiers_.insert(identifier));
+    return *insert.first;
+}
+
+void CYScope::Merge(CYContext &context, CYIdentifier *identifier) {
+    std::pair<CYIdentifierValueSet::iterator, bool> insert(identifiers_.insert(identifier));
+    if (!insert.second) {
+        if ((*insert.first)->offset_ < identifier->offset_)
+            (*insert.first)->offset_ = identifier->offset_;
+        identifier->replace_ = *insert.first;
+        (*insert.first)->usage_ += identifier->usage_ + 1;
+    }
+}
+
+namespace {
+    struct IdentifierOffset {
+        size_t offset_;
+        CYIdentifierFlags flags_;
+        size_t usage_;
+        CYIdentifier *identifier_;
+
+        IdentifierOffset(CYIdentifier *identifier, CYIdentifierFlags flags) :
+            offset_(identifier->offset_),
+            flags_(flags),
+            usage_(identifier->usage_),
+            identifier_(identifier)
+        {
+        }
+    };
+
+    struct IdentifierOffsetLess :
+        std::binary_function<const IdentifierOffset &, const IdentifierOffset &, bool>
+    {
+        _finline bool operator ()(const IdentifierOffset &lhs, const IdentifierOffset &rhs) const {
+            if (lhs.offset_ != rhs.offset_)
+                return lhs.offset_ < rhs.offset_;
+            if (lhs.flags_ != rhs.flags_)
+                return lhs.flags_ < rhs.flags_;
+            /*if (lhs.usage_ != rhs.usage_)
+                return lhs.usage_ < rhs.usage_;*/
+            return lhs.identifier_ < rhs.identifier_;
+        }
+    };
+
+    typedef std::set<IdentifierOffset, IdentifierOffsetLess> IdentifierOffsets;
+}
+
+void CYScope::Scope(CYContext &context, CYStatement *&statements) {
+    if (parent_ == NULL)
+        return;
+
+    CYDeclarations *last(NULL), *curr(NULL);
+
+    IdentifierOffsets offsets;
+
+    for (CYIdentifierAddressFlagsMap::const_iterator i(internal_.begin()); i != internal_.end(); ++i)
+        if (i->second != CYIdentifierMagic)
+            offsets.insert(IdentifierOffset(i->first, i->second));
+
+    size_t offset(0);
+
+    for (IdentifierOffsets::const_iterator i(offsets.begin()); i != offsets.end(); ++i) {
+        if (i->flags_ == CYIdentifierVariable) {
+            CYDeclarations *next($ CYDeclarations($ CYDeclaration(i->identifier_)));
+            if (last == NULL)
+                last = next;
+            if (curr != NULL)
+                curr->SetNext(next);
+            curr = next;
+        }
+
+        if (offset < i->offset_)
+            offset = i->offset_;
+        if (context.rename_.size() <= offset)
+            context.rename_.resize(offset + 1);
+
+        CYIdentifierUsage &rename(context.rename_[offset++]);
+        i->identifier_->SetNext(rename.identifier_);
+        rename.identifier_ = i->identifier_;
+        rename.usage_ += i->identifier_->usage_ + 1;
+    }
+
+    if (last != NULL) {
+        CYVar *var($ CYVar(last));
+        var->SetNext(statements);
+        statements = var;
+    }
+
+    for (CYIdentifierValueSet::const_iterator i(identifiers_.begin()); i != identifiers_.end(); ++i)
+        if (internal_.find(*i) == internal_.end()) {
+            //std::cout << *i << '=' << offset << std::endl;
+            if ((*i)->offset_ < offset)
+                (*i)->offset_ = offset;
+            parent_->Merge(context, *i);
+        }
+}
+
+CYStatement *CYStatement::Collapse(CYContext &context) {
+    return this;
 }
 
 CYStatement *CYStatement::ReplaceAll(CYContext &context) { $T(NULL)
     CYStatement *replace(this);
     context.Replace(replace);
+    replace->SetNext(next_->ReplaceAll(context));
+    return replace->Collapse(context);
+}
 
-    if (CYStatement *next = next_->ReplaceAll(context))
-        replace->SetNext(next);
-    else
-        replace->SetNext(next_);
+CYString *CYString::Concat(CYContext &context, CYString *rhs) const {
+    size_t size(size_ + rhs->size_);
+    char *value(new(context.pool_) char[size + 1]);
+    memcpy(value, value_, size_);
+    memcpy(value + size_, rhs->value_, rhs->size_);
+    value[size] = '\0';
+    return $S(value, size);
+}
 
-    return replace;
+CYNumber *CYString::Number(CYContext &context) {
+    // XXX: there is a precise algorithm for this
+    return NULL;
+}
+
+CYString *CYString::String(CYContext &context) {
+    return this;
 }
 
 CYStatement *CYSwitch::Replace(CYContext &context) {
     context.Replace(value_);
     clauses_->Replace(context);
-    return NULL;
+    return this;
 }
 
 CYExpression *CYThis::Replace(CYContext &context) {
-    return NULL;
+    return this;
 }
 
-CYStatement *CYThrow::Replace(CYContext &context) {
+namespace cy {
+namespace Syntax {
+
+CYStatement *Throw::Replace(CYContext &context) {
     context.Replace(value_);
-    return NULL;
+    return this;
 }
 
+} }
+
 CYExpression *CYTrivial::Replace(CYContext &context) {
-    return NULL;
+    return this;
 }
 
-CYStatement *CYTry::Replace(CYContext &context) {
+CYNumber *CYTrue::Number(CYContext &context) {
+    return $D(1);
+}
+
+CYString *CYTrue::String(CYContext &context) {
+    return $S("true");
+}
+
+namespace cy {
+namespace Syntax {
+
+CYStatement *Try::Replace(CYContext &context) {
     code_.Replace(context);
     catch_->Replace(context);
     finally_->Replace(context);
-    return NULL;
+    return this;
 }
 
+} }
+
 CYStatement *CYVar::Replace(CYContext &context) {
-    declarations_->Replace(context);
-    return NULL;
+    return $E(declarations_->Replace(context));
 }
 
 CYExpression *CYVariable::Replace(CYContext &context) {
-    return NULL;
+    name_ = name_->Replace(context);
+    return this;
 }
 
 CYStatement *CYWhile::Replace(CYContext &context) {
     context.Replace(test_);
     context.Replace(code_);
-    return NULL;
+    return this;
 }
 
 CYStatement *CYWith::Replace(CYContext &context) {
     context.Replace(scope_);
     context.Replace(code_);
-    return NULL;
+    return this;
 }
 
 CYExpression *CYWord::ClassName(CYContext &context, bool object) {