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-rw-r--r--src/3rdparty/angle/src/compiler/preprocessor/new/MacroExpander.cpp370
1 files changed, 370 insertions, 0 deletions
diff --git a/src/3rdparty/angle/src/compiler/preprocessor/new/MacroExpander.cpp b/src/3rdparty/angle/src/compiler/preprocessor/new/MacroExpander.cpp
new file mode 100644
index 0000000000..701cec9a4b
--- /dev/null
+++ b/src/3rdparty/angle/src/compiler/preprocessor/new/MacroExpander.cpp
@@ -0,0 +1,370 @@
+//
+// Copyright (c) 2011 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+#include "MacroExpander.h"
+
+#include <algorithm>
+#include <sstream>
+
+#include "Diagnostics.h"
+#include "Token.h"
+
+namespace pp
+{
+
+class TokenLexer : public Lexer
+{
+ public:
+ typedef std::vector<Token> TokenVector;
+
+ TokenLexer(TokenVector* tokens)
+ {
+ tokens->swap(mTokens);
+ mIter = mTokens.begin();
+ }
+
+ virtual void lex(Token* token)
+ {
+ if (mIter == mTokens.end())
+ {
+ token->reset();
+ token->type = Token::LAST;
+ }
+ else
+ {
+ *token = *mIter++;
+ }
+ }
+
+ private:
+ PP_DISALLOW_COPY_AND_ASSIGN(TokenLexer);
+
+ TokenVector mTokens;
+ TokenVector::const_iterator mIter;
+};
+
+MacroExpander::MacroExpander(Lexer* lexer,
+ MacroSet* macroSet,
+ Diagnostics* diagnostics) :
+ mLexer(lexer),
+ mMacroSet(macroSet),
+ mDiagnostics(diagnostics)
+{
+}
+
+MacroExpander::~MacroExpander()
+{
+ for (size_t i = 0; i < mContextStack.size(); ++i)
+ {
+ delete mContextStack[i];
+ }
+}
+
+void MacroExpander::lex(Token* token)
+{
+ while (true)
+ {
+ getToken(token);
+
+ if (token->type != Token::IDENTIFIER)
+ break;
+
+ if (token->expansionDisabled())
+ break;
+
+ MacroSet::const_iterator iter = mMacroSet->find(token->text);
+ if (iter == mMacroSet->end())
+ break;
+
+ const Macro& macro = iter->second;
+ if (macro.disabled)
+ {
+ // If a particular token is not expanded, it is never expanded.
+ token->setExpansionDisabled(true);
+ break;
+ }
+ if ((macro.type == Macro::kTypeFunc) && !isNextTokenLeftParen())
+ {
+ // If the token immediately after the macro name is not a '(',
+ // this macro should not be expanded.
+ break;
+ }
+
+ pushMacro(macro, *token);
+ }
+}
+
+void MacroExpander::getToken(Token* token)
+{
+ if (mReserveToken.get())
+ {
+ *token = *mReserveToken;
+ mReserveToken.reset();
+ return;
+ }
+
+ // First pop all empty macro contexts.
+ while (!mContextStack.empty() && mContextStack.back()->empty())
+ {
+ popMacro();
+ }
+
+ if (!mContextStack.empty())
+ {
+ *token = mContextStack.back()->get();
+ }
+ else
+ {
+ mLexer->lex(token);
+ }
+}
+
+void MacroExpander::ungetToken(const Token& token)
+{
+ if (!mContextStack.empty())
+ {
+ MacroContext* context = mContextStack.back();
+ context->unget();
+ assert(context->replacements[context->index] == token);
+ }
+ else
+ {
+ assert(!mReserveToken.get());
+ mReserveToken.reset(new Token(token));
+ }
+}
+
+bool MacroExpander::isNextTokenLeftParen()
+{
+ Token token;
+ getToken(&token);
+
+ bool lparen = token.type == '(';
+ ungetToken(token);
+
+ return lparen;
+}
+
+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);
+
+ std::vector<Token> replacements;
+ if (!expandMacro(macro, identifier, &replacements))
+ return false;
+
+ // Macro is disabled for expansion until it is popped off the stack.
+ macro.disabled = true;
+
+ MacroContext* context = new MacroContext;
+ context->macro = &macro;
+ context->replacements.swap(replacements);
+ mContextStack.push_back(context);
+ return true;
+}
+
+void MacroExpander::popMacro()
+{
+ assert(!mContextStack.empty());
+
+ MacroContext* context = mContextStack.back();
+ mContextStack.pop_back();
+
+ assert(context->empty());
+ assert(context->macro->disabled);
+ context->macro->disabled = false;
+ delete context;
+}
+
+bool MacroExpander::expandMacro(const Macro& macro,
+ const Token& identifier,
+ std::vector<Token>* replacements)
+{
+ replacements->clear();
+ if (macro.type == Macro::kTypeObj)
+ {
+ replacements->assign(macro.replacements.begin(),
+ macro.replacements.end());
+
+ if (macro.predefined)
+ {
+ static const std::string kLine = "__LINE__";
+ static const std::string kFile = "__FILE__";
+
+ assert(replacements->size() == 1);
+ Token& repl = replacements->front();
+ if (macro.name == kLine)
+ {
+ std::ostringstream stream;
+ stream << identifier.location.line;
+ repl.text = stream.str();
+ }
+ else if (macro.name == kFile)
+ {
+ std::ostringstream stream;
+ stream << identifier.location.file;
+ repl.text = stream.str();
+ }
+ }
+ }
+ else
+ {
+ assert(macro.type == Macro::kTypeFunc);
+ std::vector<MacroArg> args;
+ args.reserve(macro.parameters.size());
+ if (!collectMacroArgs(macro, identifier, &args))
+ return false;
+
+ replaceMacroParams(macro, args, replacements);
+ }
+
+ for (size_t i = 0; i < replacements->size(); ++i)
+ {
+ Token& repl = replacements->at(i);
+ if (i == 0)
+ {
+ // The first token in the replacement list inherits the padding
+ // properties of the identifier token.
+ repl.setAtStartOfLine(identifier.atStartOfLine());
+ repl.setHasLeadingSpace(identifier.hasLeadingSpace());
+ }
+ repl.location = identifier.location;
+ }
+ return true;
+}
+
+bool MacroExpander::collectMacroArgs(const Macro& macro,
+ const Token& identifier,
+ std::vector<MacroArg>* args)
+{
+ Token token;
+ getToken(&token);
+ assert(token.type == '(');
+
+ args->push_back(MacroArg());
+ for (int openParens = 1; openParens != 0; )
+ {
+ getToken(&token);
+
+ if (token.type == Token::LAST)
+ {
+ mDiagnostics->report(Diagnostics::MACRO_UNTERMINATED_INVOCATION,
+ identifier.location, identifier.text);
+ // Do not lose EOF token.
+ ungetToken(token);
+ return false;
+ }
+
+ bool isArg = false; // True if token is part of the current argument.
+ switch (token.type)
+ {
+ case '(':
+ ++openParens;
+ isArg = true;
+ break;
+ case ')':
+ --openParens;
+ isArg = openParens != 0;
+ break;
+ case ',':
+ // The individual arguments are separated by comma tokens, but
+ // the comma tokens between matching inner parentheses do not
+ // seperate arguments.
+ if (openParens == 1) args->push_back(MacroArg());
+ isArg = openParens != 1;
+ break;
+ default:
+ isArg = true;
+ break;
+ }
+ if (isArg)
+ {
+ MacroArg& arg = args->back();
+ // Initial whitespace is not part of the argument.
+ if (arg.empty()) token.setHasLeadingSpace(false);
+ arg.push_back(token);
+ }
+ }
+
+ const Macro::Parameters& params = macro.parameters;
+ // If there is only one empty argument, it is equivalent to no argument.
+ if (params.empty() && (args->size() == 1) && args->front().empty())
+ {
+ args->clear();
+ }
+ // Validate the number of arguments.
+ if (args->size() != params.size())
+ {
+ Diagnostics::ID id = args->size() < macro.parameters.size() ?
+ Diagnostics::MACRO_TOO_FEW_ARGS :
+ Diagnostics::MACRO_TOO_MANY_ARGS;
+ mDiagnostics->report(id, identifier.location, identifier.text);
+ return false;
+ }
+
+ // Pre-expand each argument before substitution.
+ // This step expands each argument individually before they are
+ // inserted into the macro body.
+ for (size_t i = 0; i < args->size(); ++i)
+ {
+ MacroArg& arg = args->at(i);
+ TokenLexer lexer(&arg);
+ MacroExpander expander(&lexer, mMacroSet, mDiagnostics);
+
+ arg.clear();
+ expander.lex(&token);
+ while (token.type != Token::LAST)
+ {
+ arg.push_back(token);
+ expander.lex(&token);
+ }
+ }
+ return true;
+}
+
+void MacroExpander::replaceMacroParams(const Macro& macro,
+ const std::vector<MacroArg>& args,
+ std::vector<Token>* replacements)
+{
+ for (size_t i = 0; i < macro.replacements.size(); ++i)
+ {
+ const Token& repl = macro.replacements[i];
+ if (repl.type != Token::IDENTIFIER)
+ {
+ replacements->push_back(repl);
+ continue;
+ }
+
+ // TODO(alokp): Optimize this.
+ // There is no need to search for macro params every time.
+ // The param index can be cached with the replacement token.
+ Macro::Parameters::const_iterator iter = std::find(
+ macro.parameters.begin(), macro.parameters.end(), repl.text);
+ if (iter == macro.parameters.end())
+ {
+ replacements->push_back(repl);
+ continue;
+ }
+
+ size_t iArg = std::distance(macro.parameters.begin(), iter);
+ const MacroArg& arg = args[iArg];
+ if (arg.empty())
+ {
+ continue;
+ }
+ size_t iRepl = replacements->size();
+ replacements->insert(replacements->end(), arg.begin(), arg.end());
+ // The replacement token inherits padding properties from
+ // macro replacement token.
+ replacements->at(iRepl).setHasLeadingSpace(repl.hasLeadingSpace());
+ }
+}
+
+} // namespace pp
+