Roll back to ANGLE/2845

1 files changed, 31 insertions, 120 deletions

diff --git a/gfx/angle/src/compiler/preprocessor/MacroExpander.cpp b/gfx/angle/src/compiler/preprocessor/MacroExpander.cpp
index 2f854f5a6..3c0423e72 100755
--- a/gfx/angle/src/compiler/preprocessor/MacroExpander.cpp
+++ b/gfx/angle/src/compiler/preprocessor/MacroExpander.cpp
@@ -4,22 +4,17 @@
 // found in the LICENSE file.
 //
 
-#include "compiler/preprocessor/MacroExpander.h"
+#include "MacroExpander.h"
 
 #include <algorithm>
+#include <sstream>
 
-#include "common/debug.h"
-#include "compiler/preprocessor/DiagnosticsBase.h"
-#include "compiler/preprocessor/Token.h"
+#include "DiagnosticsBase.h"
+#include "Token.h"
 
 namespace pp
 {
 
-namespace
-{
-
-const size_t kMaxContextTokens = 10000;
-
 class TokenLexer : public Lexer
 {
  public:
@@ -45,52 +40,22 @@ class TokenLexer : public Lexer
     }
 
  private:
+    PP_DISALLOW_COPY_AND_ASSIGN(TokenLexer);
+
     TokenVector mTokens;
     TokenVector::const_iterator mIter;
 };
 
-}  // anonymous namespace
-
-class MacroExpander::ScopedMacroReenabler final : angle::NonCopyable
-{
-  public:
-    ScopedMacroReenabler(MacroExpander *expander);
-    ~ScopedMacroReenabler();
-
-  private:
-    MacroExpander *mExpander;
-};
-
-MacroExpander::ScopedMacroReenabler::ScopedMacroReenabler(MacroExpander *expander)
-    : mExpander(expander)
-{
-    mExpander->mDeferReenablingMacros = true;
-}
-
-MacroExpander::ScopedMacroReenabler::~ScopedMacroReenabler()
-{
-    mExpander->mDeferReenablingMacros = false;
-    for (auto *macro : mExpander->mMacrosToReenable)
-    {
-        macro->disabled = false;
-    }
-    mExpander->mMacrosToReenable.clear();
-}
-
 MacroExpander::MacroExpander(Lexer *lexer, MacroSet *macroSet, Diagnostics *diagnostics)
-    : mLexer(lexer),
-      mMacroSet(macroSet),
-      mDiagnostics(diagnostics),
-      mTotalTokensInContexts(0),
-      mDeferReenablingMacros(false)
+    : mLexer(lexer), mMacroSet(macroSet), mDiagnostics(diagnostics)
 {
 }
 
 MacroExpander::~MacroExpander()
 {
-    for (MacroContext *context : mContextStack)
+    for (std::size_t i = 0; i < mContextStack.size(); ++i)
     {
-        delete context;
+        delete mContextStack[i];
     }
 }
 
@@ -117,15 +82,10 @@ void MacroExpander::lex(Token *token)
             token->setExpansionDisabled(true);
             break;
         }
-
-        // Bump the expansion count before peeking if the next token is a '('
-        // otherwise there could be a #undef of the macro before the next token.
-        macro.expansionCount++;
         if ((macro.type == Macro::kTypeFunc) && !isNextTokenLeftParen())
         {
             // If the token immediately after the macro name is not a '(',
             // this macro should not be expanded.
-            macro.expansionCount--;
             break;
         }
 
@@ -154,7 +114,6 @@ void MacroExpander::getToken(Token *token)
     }
     else
     {
-        ASSERT(mTotalTokensInContexts == 0);
         mLexer->lex(token);
     }
 }
@@ -165,11 +124,11 @@ void MacroExpander::ungetToken(const Token &token)
     {
         MacroContext *context = mContextStack.back();
         context->unget();
-        ASSERT(context->replacements[context->index] == token);
+        assert(context->replacements[context->index] == token);
     }
     else
     {
-        ASSERT(!mReserveToken.get());
+        assert(!mReserveToken.get());
         mReserveToken.reset(new Token(token));
     }
 }
@@ -187,10 +146,10 @@ bool MacroExpander::isNextTokenLeftParen()
 
 bool MacroExpander::pushMacro(const Macro &macro, const Token &identifier)
 {
-    ASSERT(!macro.disabled);
-    ASSERT(!identifier.expansionDisabled());
-    ASSERT(identifier.type == Token::IDENTIFIER);
-    ASSERT(identifier.text == macro.name);
+    assert(!macro.disabled);
+    assert(!identifier.expansionDisabled());
+    assert(identifier.type == Token::IDENTIFIER);
+    assert(identifier.text == macro.name);
 
     std::vector<Token> replacements;
     if (!expandMacro(macro, identifier, &replacements))
@@ -203,30 +162,19 @@ bool MacroExpander::pushMacro(const Macro &macro, const Token &identifier)
     context->macro = &macro;
     context->replacements.swap(replacements);
     mContextStack.push_back(context);
-    mTotalTokensInContexts += context->replacements.size();
     return true;
 }
 
 void MacroExpander::popMacro()
 {
-    ASSERT(!mContextStack.empty());
+    assert(!mContextStack.empty());
 
     MacroContext *context = mContextStack.back();
     mContextStack.pop_back();
 
-    ASSERT(context->empty());
-    ASSERT(context->macro->disabled);
-    ASSERT(context->macro->expansionCount > 0);
-    if (mDeferReenablingMacros)
-    {
-        mMacrosToReenable.push_back(context->macro);
-    }
-    else
-    {
-        context->macro->disabled = false;
-    }
-    context->macro->expansionCount--;
-    mTotalTokensInContexts -= context->replacements.size();
+    assert(context->empty());
+    assert(context->macro->disabled);
+    context->macro->disabled = false;
     delete context;
 }
 
@@ -251,21 +199,25 @@ bool MacroExpander::expandMacro(const Macro &macro,
             const char kLine[] = "__LINE__";
             const char kFile[] = "__FILE__";
 
-            ASSERT(replacements->size() == 1);
+            assert(replacements->size() == 1);
             Token& repl = replacements->front();
             if (macro.name == kLine)
             {
-                repl.text = ToString(identifier.location.line);
+                std::ostringstream stream;
+                stream << identifier.location.line;
+                repl.text = stream.str();
             }
             else if (macro.name == kFile)
             {
-                repl.text = ToString(identifier.location.file);
+                std::ostringstream stream;
+                stream << identifier.location.file;
+                repl.text = stream.str();
             }
         }
     }
     else
     {
-        ASSERT(macro.type == Macro::kTypeFunc);
+        assert(macro.type == Macro::kTypeFunc);
         std::vector<MacroArg> args;
         args.reserve(macro.parameters.size());
         if (!collectMacroArgs(macro, identifier, &args, &replacementLocation))
@@ -296,17 +248,10 @@ bool MacroExpander::collectMacroArgs(const Macro &macro,
 {
     Token token;
     getToken(&token);
-    ASSERT(token.type == '(');
+    assert(token.type == '(');
 
     args->push_back(MacroArg());
-
-    // Defer reenabling macros until args collection is finished to avoid the possibility of
-    // infinite recursion. Otherwise infinite recursion might happen when expanding the args after
-    // macros have been popped from the context stack when parsing the args.
-    ScopedMacroReenabler deferReenablingMacros(this);
-
-    int openParens = 1;
-    while (openParens != 0)
+    for (int openParens = 1; openParens != 0; )
     {
         getToken(&token);
 
@@ -372,9 +317,9 @@ bool MacroExpander::collectMacroArgs(const Macro &macro,
     // Pre-expand each argument before substitution.
     // This step expands each argument individually before they are
     // inserted into the macro body.
-    size_t numTokens = 0;
-    for (auto &arg : *args)
+    for (std::size_t i = 0; i < args->size(); ++i)
     {
+        MacroArg &arg = args->at(i);
         TokenLexer lexer(&arg);
         MacroExpander expander(&lexer, mMacroSet, mDiagnostics);
 
@@ -384,12 +329,6 @@ bool MacroExpander::collectMacroArgs(const Macro &macro,
         {
             arg.push_back(token);
             expander.lex(&token);
-            numTokens++;
-            if (numTokens + mTotalTokensInContexts > kMaxContextTokens)
-            {
-                mDiagnostics->report(Diagnostics::PP_OUT_OF_MEMORY, token.location, token.text);
-                return false;
-            }
         }
     }
     return true;
@@ -401,14 +340,6 @@ void MacroExpander::replaceMacroParams(const Macro &macro,
 {
     for (std::size_t i = 0; i < macro.replacements.size(); ++i)
     {
-        if (!replacements->empty() &&
-            replacements->size() + mTotalTokensInContexts > kMaxContextTokens)
-        {
-            const Token &token = replacements->back();
-            mDiagnostics->report(Diagnostics::PP_OUT_OF_MEMORY, token.location, token.text);
-            return;
-        }
-
         const Token &repl = macro.replacements[i];
         if (repl.type != Token::IDENTIFIER)
         {
@@ -441,25 +372,5 @@ void MacroExpander::replaceMacroParams(const Macro &macro,
     }
 }
 
-MacroExpander::MacroContext::MacroContext() : macro(0), index(0)
-{
-}
-
-bool MacroExpander::MacroContext::empty() const
-{
-    return index == replacements.size();
-}
-
-const Token &MacroExpander::MacroContext::get()
-{
-    return replacements[index++];
-}
-
-void MacroExpander::MacroContext::unget()
-{
-    ASSERT(index > 0);
-    --index;
-}
-
 }  // namespace pp