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Move some Pragma-related methods from Preprocessor.cpp to Pragma.cpp

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llvm-svn: 38616
This commit is contained in:
Chris Lattner
2006-07-02 22:41:36 +00:00
parent 1840e491dc
commit b694ba7b40
2 changed files with 301 additions and 295 deletions
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302
clang/Lex/Pragma.cpp
View File

@@ -7,12 +7,17 @@
//
//===----------------------------------------------------------------------===//
//
// This file implements the PragmaHandler and PragmaTable interfaces.
// This file implements the PragmaHandler/PragmaTable interfaces and implements
// pragma related methods of the Preprocessor class.
//
//===----------------------------------------------------------------------===//
#include "clang/Lex/Pragma.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Lex/ScratchBuffer.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/SourceManager.h"
using namespace llvm;
using namespace clang;
@@ -32,3 +37,298 @@ void PragmaNamespace::HandlePragma(Preprocessor &PP, LexerToken &Tok) {
// Otherwise, pass it down.
Handler->HandlePragma(PP, Tok);
}
//===----------------------------------------------------------------------===//
// Preprocessor Pragma Directive Handling.
//===----------------------------------------------------------------------===//
/// HandlePragmaDirective - The "#pragma" directive has been parsed. Lex the
/// rest of the pragma, passing it to the registered pragma handlers.
void Preprocessor::HandlePragmaDirective() {
++NumPragma;
// Invoke the first level of pragma handlers which reads the namespace id.
LexerToken Tok;
PragmaHandlers->HandlePragma(*this, Tok);
// If the pragma handler didn't read the rest of the line, consume it now.
if (CurLexer->ParsingPreprocessorDirective)
DiscardUntilEndOfDirective();
}
/// Handle_Pragma - Read a _Pragma directive, slice it up, process it, then
/// return the first token after the directive. The _Pragma token has just
/// been read into 'Tok'.
void Preprocessor::Handle_Pragma(LexerToken &Tok) {
// Remember the pragma token location.
SourceLocation PragmaLoc = Tok.getLocation();
// Read the '('.
Lex(Tok);
if (Tok.getKind() != tok::l_paren)
return Diag(PragmaLoc, diag::err__Pragma_malformed);
// Read the '"..."'.
Lex(Tok);
if (Tok.getKind() != tok::string_literal)
return Diag(PragmaLoc, diag::err__Pragma_malformed);
// Remember the string.
std::string StrVal = getSpelling(Tok);
SourceLocation StrLoc = Tok.getLocation();
// Read the ')'.
Lex(Tok);
if (Tok.getKind() != tok::r_paren)
return Diag(PragmaLoc, diag::err__Pragma_malformed);
// The _Pragma is lexically sound. Destringize according to C99 6.10.9.1.
if (StrVal[0] == 'L') // Remove L prefix.
StrVal.erase(StrVal.begin());
assert(StrVal[0] == '"' && StrVal[StrVal.size()-1] == '"' &&
"Invalid string token!");
// Remove the front quote, replacing it with a space, so that the pragma
// contents appear to have a space before them.
StrVal[0] = ' ';
// Replace the terminating quote with a \n\0.
StrVal[StrVal.size()-1] = '\n';
StrVal += '\0';
// Remove escaped quotes and escapes.
for (unsigned i = 0, e = StrVal.size(); i != e-1; ++i) {
if (StrVal[i] == '\\' &&
(StrVal[i+1] == '\\' || StrVal[i+1] == '"')) {
// \\ -> '\' and \" -> '"'.
StrVal.erase(StrVal.begin()+i);
--e;
}
}
// Plop the string (including the trailing null) into a buffer where we can
// lex it.
SourceLocation TokLoc = ScratchBuf->getToken(&StrVal[0], StrVal.size());
const char *StrData = SourceMgr.getCharacterData(TokLoc);
// FIXME: Create appropriate mapping info for this FileID, so that we know the
// tokens are coming out of the input string (StrLoc).
unsigned FileID = TokLoc.getFileID();
assert(FileID && "Could not create FileID for predefines?");
// Make and enter a lexer object so that we lex and expand the tokens just
// like any others.
Lexer *TL = new Lexer(SourceMgr.getBuffer(FileID), FileID, *this,
StrData, StrData+StrVal.size()-1 /* no null */);
EnterSourceFileWithLexer(TL, 0);
// Ensure that the lexer thinks it is inside a directive, so that end \n will
// return an EOM token.
TL->ParsingPreprocessorDirective = true;
// This lexer really is for _Pragma.
TL->Is_PragmaLexer = true;
// With everything set up, lex this as a #pragma directive.
HandlePragmaDirective();
// Finally, return whatever came after the pragma directive.
return Lex(Tok);
}
/// HandlePragmaOnce - Handle #pragma once. OnceTok is the 'once'.
///
void Preprocessor::HandlePragmaOnce(LexerToken &OnceTok) {
if (isInPrimaryFile()) {
Diag(OnceTok, diag::pp_pragma_once_in_main_file);
return;
}
// Get the current file lexer we're looking at. Ignore _Pragma 'files' etc.
unsigned FileID = getCurrentFileLexer()->getCurFileID();
// Mark the file as a once-only file now.
getFileInfo(SourceMgr.getFileEntryForFileID(FileID)).isImport = true;
}
/// HandlePragmaPoison - Handle #pragma GCC poison. PoisonTok is the 'poison'.
///
void Preprocessor::HandlePragmaPoison(LexerToken &PoisonTok) {
LexerToken Tok;
assert(!SkippingContents && "Why are we handling pragmas while skipping?");
while (1) {
// Read the next token to poison. While doing this, pretend that we are
// skipping while reading the identifier to poison.
// This avoids errors on code like:
// #pragma GCC poison X
// #pragma GCC poison X
SkippingContents = true;
LexUnexpandedToken(Tok);
SkippingContents = false;
// If we reached the end of line, we're done.
if (Tok.getKind() == tok::eom) return;
// Can only poison identifiers.
if (Tok.getKind() != tok::identifier) {
Diag(Tok, diag::err_pp_invalid_poison);
return;
}
// Look up the identifier info for the token.
std::string TokStr = getSpelling(Tok);
IdentifierTokenInfo *II =
getIdentifierInfo(&TokStr[0], &TokStr[0]+TokStr.size());
// Already poisoned.
if (II->isPoisoned()) continue;
// If this is a macro identifier, emit a warning.
if (II->getMacroInfo())
Diag(Tok, diag::pp_poisoning_existing_macro);
// Finally, poison it!
II->setIsPoisoned();
}
}
/// HandlePragmaSystemHeader - Implement #pragma GCC system_header. We know
/// that the whole directive has been parsed.
void Preprocessor::HandlePragmaSystemHeader(LexerToken &SysHeaderTok) {
if (isInPrimaryFile()) {
Diag(SysHeaderTok, diag::pp_pragma_sysheader_in_main_file);
return;
}
// Get the current file lexer we're looking at. Ignore _Pragma 'files' etc.
Lexer *TheLexer = getCurrentFileLexer();
// Mark the file as a system header.
const FileEntry *File =
SourceMgr.getFileEntryForFileID(TheLexer->getCurFileID());
getFileInfo(File).DirInfo = DirectoryLookup::SystemHeaderDir;
// Notify the client, if desired, that we are in a new source file.
if (FileChangeHandler)
FileChangeHandler(TheLexer->getSourceLocation(TheLexer->BufferPtr),
SystemHeaderPragma, DirectoryLookup::SystemHeaderDir);
}
/// HandlePragmaDependency - Handle #pragma GCC dependency "foo" blah.
///
void Preprocessor::HandlePragmaDependency(LexerToken &DependencyTok) {
LexerToken FilenameTok;
std::string Filename = CurLexer->LexIncludeFilename(FilenameTok);
// If the token kind is EOM, the error has already been diagnosed.
if (FilenameTok.getKind() == tok::eom)
return;
// Find out whether the filename is <x> or "x".
bool isAngled = Filename[0] == '<';
// Remove the quotes.
Filename = std::string(Filename.begin()+1, Filename.end()-1);
// Search include directories.
const DirectoryLookup *CurDir;
const FileEntry *File = LookupFile(Filename, isAngled, 0, CurDir);
if (File == 0)
return Diag(FilenameTok, diag::err_pp_file_not_found);
unsigned FileID = getCurrentFileLexer()->getCurFileID();
const FileEntry *CurFile = SourceMgr.getFileEntryForFileID(FileID);
// If this file is older than the file it depends on, emit a diagnostic.
if (CurFile && CurFile->getModificationTime() < File->getModificationTime()) {
// Lex tokens at the end of the message and include them in the message.
std::string Message;
Lex(DependencyTok);
while (DependencyTok.getKind() != tok::eom) {
Message += getSpelling(DependencyTok) + " ";
Lex(DependencyTok);
}
Message.erase(Message.end()-1);
Diag(FilenameTok, diag::pp_out_of_date_dependency, Message);
}
}
/// AddPragmaHandler - Add the specified pragma handler to the preprocessor.
/// If 'Namespace' is non-null, then it is a token required to exist on the
/// pragma line before the pragma string starts, e.g. "STDC" or "GCC".
void Preprocessor::AddPragmaHandler(const char *Namespace,
PragmaHandler *Handler) {
PragmaNamespace *InsertNS = PragmaHandlers;
// If this is specified to be in a namespace, step down into it.
if (Namespace) {
IdentifierTokenInfo *NSID = getIdentifierInfo(Namespace);
// If there is already a pragma handler with the name of this namespace,
// we either have an error (directive with the same name as a namespace) or
// we already have the namespace to insert into.
if (PragmaHandler *Existing = PragmaHandlers->FindHandler(NSID)) {
InsertNS = Existing->getIfNamespace();
assert(InsertNS != 0 && "Cannot have a pragma namespace and pragma"
" handler with the same name!");
} else {
// Otherwise, this namespace doesn't exist yet, create and insert the
// handler for it.
InsertNS = new PragmaNamespace(NSID);
PragmaHandlers->AddPragma(InsertNS);
}
}
// Check to make sure we don't already have a pragma for this identifier.
assert(!InsertNS->FindHandler(Handler->getName()) &&
"Pragma handler already exists for this identifier!");
InsertNS->AddPragma(Handler);
}
namespace {
struct PragmaOnceHandler : public PragmaHandler {
PragmaOnceHandler(const IdentifierTokenInfo *OnceID) : PragmaHandler(OnceID){}
virtual void HandlePragma(Preprocessor &PP, LexerToken &OnceTok) {
PP.CheckEndOfDirective("#pragma once");
PP.HandlePragmaOnce(OnceTok);
}
};
struct PragmaPoisonHandler : public PragmaHandler {
PragmaPoisonHandler(const IdentifierTokenInfo *ID) : PragmaHandler(ID) {}
virtual void HandlePragma(Preprocessor &PP, LexerToken &PoisonTok) {
PP.HandlePragmaPoison(PoisonTok);
}
};
struct PragmaSystemHeaderHandler : public PragmaHandler {
PragmaSystemHeaderHandler(const IdentifierTokenInfo *ID) : PragmaHandler(ID){}
virtual void HandlePragma(Preprocessor &PP, LexerToken &SHToken) {
PP.HandlePragmaSystemHeader(SHToken);
PP.CheckEndOfDirective("#pragma");
}
};
struct PragmaDependencyHandler : public PragmaHandler {
PragmaDependencyHandler(const IdentifierTokenInfo *ID) : PragmaHandler(ID) {}
virtual void HandlePragma(Preprocessor &PP, LexerToken &DepToken) {
PP.HandlePragmaDependency(DepToken);
}
};
} // end anonymous namespace
/// RegisterBuiltinPragmas - Install the standard preprocessor pragmas:
/// #pragma GCC poison/system_header/dependency and #pragma once.
void Preprocessor::RegisterBuiltinPragmas() {
AddPragmaHandler(0, new PragmaOnceHandler(getIdentifierInfo("once")));
AddPragmaHandler("GCC", new PragmaPoisonHandler(getIdentifierInfo("poison")));
AddPragmaHandler("GCC", new PragmaSystemHeaderHandler(
getIdentifierInfo("system_header")));
AddPragmaHandler("GCC", new PragmaDependencyHandler(
getIdentifierInfo("dependency")));
}

294
clang/Lex/Preprocessor.cpp
View File

@@ -1454,297 +1454,3 @@ void Preprocessor::HandleElifDirective(LexerToken &ElifToken) {
/*FoundElse*/CI.FoundElse);
}
//===----------------------------------------------------------------------===//
// Preprocessor Pragma Directive Handling.
//===----------------------------------------------------------------------===//
/// HandlePragmaDirective - The "#pragma" directive has been parsed. Lex the
/// rest of the pragma, passing it to the registered pragma handlers.
void Preprocessor::HandlePragmaDirective() {
++NumPragma;
// Invoke the first level of pragma handlers which reads the namespace id.
LexerToken Tok;
PragmaHandlers->HandlePragma(*this, Tok);
// If the pragma handler didn't read the rest of the line, consume it now.
if (CurLexer->ParsingPreprocessorDirective)
DiscardUntilEndOfDirective();
}
/// Handle_Pragma - Read a _Pragma directive, slice it up, process it, then
/// return the first token after the directive. The _Pragma token has just
/// been read into 'Tok'.
void Preprocessor::Handle_Pragma(LexerToken &Tok) {
// Remember the pragma token location.
SourceLocation PragmaLoc = Tok.getLocation();
// Read the '('.
Lex(Tok);
if (Tok.getKind() != tok::l_paren)
return Diag(PragmaLoc, diag::err__Pragma_malformed);
// Read the '"..."'.
Lex(Tok);
if (Tok.getKind() != tok::string_literal)
return Diag(PragmaLoc, diag::err__Pragma_malformed);
// Remember the string.
std::string StrVal = getSpelling(Tok);
SourceLocation StrLoc = Tok.getLocation();
// Read the ')'.
Lex(Tok);
if (Tok.getKind() != tok::r_paren)
return Diag(PragmaLoc, diag::err__Pragma_malformed);
// The _Pragma is lexically sound. Destringize according to C99 6.10.9.1.
if (StrVal[0] == 'L') // Remove L prefix.
StrVal.erase(StrVal.begin());
assert(StrVal[0] == '"' && StrVal[StrVal.size()-1] == '"' &&
"Invalid string token!");
// Remove the front quote, replacing it with a space, so that the pragma
// contents appear to have a space before them.
StrVal[0] = ' ';
// Replace the terminating quote with a \n\0.
StrVal[StrVal.size()-1] = '\n';
StrVal += '\0';
// Remove escaped quotes and escapes.
for (unsigned i = 0, e = StrVal.size(); i != e-1; ++i) {
if (StrVal[i] == '\\' &&
(StrVal[i+1] == '\\' || StrVal[i+1] == '"')) {
// \\ -> '\' and \" -> '"'.
StrVal.erase(StrVal.begin()+i);
--e;
}
}
// Plop the string (including the trailing null) into a buffer where we can
// lex it.
SourceLocation TokLoc = ScratchBuf->getToken(&StrVal[0], StrVal.size());
const char *StrData = SourceMgr.getCharacterData(TokLoc);
// FIXME: Create appropriate mapping info for this FileID, so that we know the
// tokens are coming out of the input string (StrLoc).
unsigned FileID = TokLoc.getFileID();
assert(FileID && "Could not create FileID for predefines?");
// Make and enter a lexer object so that we lex and expand the tokens just
// like any others.
Lexer *TL = new Lexer(SourceMgr.getBuffer(FileID), FileID, *this,
StrData, StrData+StrVal.size()-1 /* no null */);
EnterSourceFileWithLexer(TL, 0);
// Ensure that the lexer thinks it is inside a directive, so that end \n will
// return an EOM token.
TL->ParsingPreprocessorDirective = true;
// This lexer really is for _Pragma.
TL->Is_PragmaLexer = true;
// With everything set up, lex this as a #pragma directive.
HandlePragmaDirective();
// Finally, return whatever came after the pragma directive.
return Lex(Tok);
}
/// HandlePragmaOnce - Handle #pragma once. OnceTok is the 'once'.
///
void Preprocessor::HandlePragmaOnce(LexerToken &OnceTok) {
if (isInPrimaryFile()) {
Diag(OnceTok, diag::pp_pragma_once_in_main_file);
return;
}
// Get the current file lexer we're looking at. Ignore _Pragma 'files' etc.
unsigned FileID = getCurrentFileLexer()->getCurFileID();
// Mark the file as a once-only file now.
getFileInfo(SourceMgr.getFileEntryForFileID(FileID)).isImport = true;
}
/// HandlePragmaPoison - Handle #pragma GCC poison. PoisonTok is the 'poison'.
///
void Preprocessor::HandlePragmaPoison(LexerToken &PoisonTok) {
LexerToken Tok;
assert(!SkippingContents && "Why are we handling pragmas while skipping?");
while (1) {
// Read the next token to poison. While doing this, pretend that we are
// skipping while reading the identifier to poison.
// This avoids errors on code like:
// #pragma GCC poison X
// #pragma GCC poison X
SkippingContents = true;
LexUnexpandedToken(Tok);
SkippingContents = false;
// If we reached the end of line, we're done.
if (Tok.getKind() == tok::eom) return;
// Can only poison identifiers.
if (Tok.getKind() != tok::identifier) {
Diag(Tok, diag::err_pp_invalid_poison);
return;
}
// Look up the identifier info for the token.
std::string TokStr = getSpelling(Tok);
IdentifierTokenInfo *II =
getIdentifierInfo(&TokStr[0], &TokStr[0]+TokStr.size());
// Already poisoned.
if (II->isPoisoned()) continue;
// If this is a macro identifier, emit a warning.
if (II->getMacroInfo())
Diag(Tok, diag::pp_poisoning_existing_macro);
// Finally, poison it!
II->setIsPoisoned();
}
}
/// HandlePragmaSystemHeader - Implement #pragma GCC system_header. We know
/// that the whole directive has been parsed.
void Preprocessor::HandlePragmaSystemHeader(LexerToken &SysHeaderTok) {
if (isInPrimaryFile()) {
Diag(SysHeaderTok, diag::pp_pragma_sysheader_in_main_file);
return;
}
// Get the current file lexer we're looking at. Ignore _Pragma 'files' etc.
Lexer *TheLexer = getCurrentFileLexer();
// Mark the file as a system header.
const FileEntry *File =
SourceMgr.getFileEntryForFileID(TheLexer->getCurFileID());
getFileInfo(File).DirInfo = DirectoryLookup::SystemHeaderDir;
// Notify the client, if desired, that we are in a new source file.
if (FileChangeHandler)
FileChangeHandler(TheLexer->getSourceLocation(TheLexer->BufferPtr),
SystemHeaderPragma, DirectoryLookup::SystemHeaderDir);
}
/// HandlePragmaDependency - Handle #pragma GCC dependency "foo" blah.
///
void Preprocessor::HandlePragmaDependency(LexerToken &DependencyTok) {
LexerToken FilenameTok;
std::string Filename = CurLexer->LexIncludeFilename(FilenameTok);
// If the token kind is EOM, the error has already been diagnosed.
if (FilenameTok.getKind() == tok::eom)
return;
// Find out whether the filename is <x> or "x".
bool isAngled = Filename[0] == '<';
// Remove the quotes.
Filename = std::string(Filename.begin()+1, Filename.end()-1);
// Search include directories.
const DirectoryLookup *CurDir;
const FileEntry *File = LookupFile(Filename, isAngled, 0, CurDir);
if (File == 0)
return Diag(FilenameTok, diag::err_pp_file_not_found);
unsigned FileID = getCurrentFileLexer()->getCurFileID();
const FileEntry *CurFile = SourceMgr.getFileEntryForFileID(FileID);
// If this file is older than the file it depends on, emit a diagnostic.
if (CurFile && CurFile->getModificationTime() < File->getModificationTime()) {
// Lex tokens at the end of the message and include them in the message.
std::string Message;
Lex(DependencyTok);
while (DependencyTok.getKind() != tok::eom) {
Message += getSpelling(DependencyTok) + " ";
Lex(DependencyTok);
}
Message.erase(Message.end()-1);
Diag(FilenameTok, diag::pp_out_of_date_dependency, Message);
}
}
/// AddPragmaHandler - Add the specified pragma handler to the preprocessor.
/// If 'Namespace' is non-null, then it is a token required to exist on the
/// pragma line before the pragma string starts, e.g. "STDC" or "GCC".
void Preprocessor::AddPragmaHandler(const char *Namespace,
PragmaHandler *Handler) {
PragmaNamespace *InsertNS = PragmaHandlers;
// If this is specified to be in a namespace, step down into it.
if (Namespace) {
IdentifierTokenInfo *NSID = getIdentifierInfo(Namespace);
// If there is already a pragma handler with the name of this namespace,
// we either have an error (directive with the same name as a namespace) or
// we already have the namespace to insert into.
if (PragmaHandler *Existing = PragmaHandlers->FindHandler(NSID)) {
InsertNS = Existing->getIfNamespace();
assert(InsertNS != 0 && "Cannot have a pragma namespace and pragma"
" handler with the same name!");
} else {
// Otherwise, this namespace doesn't exist yet, create and insert the
// handler for it.
InsertNS = new PragmaNamespace(NSID);
PragmaHandlers->AddPragma(InsertNS);
}
}
// Check to make sure we don't already have a pragma for this identifier.
assert(!InsertNS->FindHandler(Handler->getName()) &&
"Pragma handler already exists for this identifier!");
InsertNS->AddPragma(Handler);
}
namespace {
struct PragmaOnceHandler : public PragmaHandler {
PragmaOnceHandler(const IdentifierTokenInfo *OnceID) : PragmaHandler(OnceID){}
virtual void HandlePragma(Preprocessor &PP, LexerToken &OnceTok) {
PP.CheckEndOfDirective("#pragma once");
PP.HandlePragmaOnce(OnceTok);
}
};
struct PragmaPoisonHandler : public PragmaHandler {
PragmaPoisonHandler(const IdentifierTokenInfo *ID) : PragmaHandler(ID) {}
virtual void HandlePragma(Preprocessor &PP, LexerToken &PoisonTok) {
PP.HandlePragmaPoison(PoisonTok);
}
};
struct PragmaSystemHeaderHandler : public PragmaHandler {
PragmaSystemHeaderHandler(const IdentifierTokenInfo *ID) : PragmaHandler(ID){}
virtual void HandlePragma(Preprocessor &PP, LexerToken &SHToken) {
PP.HandlePragmaSystemHeader(SHToken);
PP.CheckEndOfDirective("#pragma");
}
};
struct PragmaDependencyHandler : public PragmaHandler {
PragmaDependencyHandler(const IdentifierTokenInfo *ID) : PragmaHandler(ID) {}
virtual void HandlePragma(Preprocessor &PP, LexerToken &DepToken) {
PP.HandlePragmaDependency(DepToken);
}
};
}
/// RegisterBuiltinPragmas - Install the standard preprocessor pragmas:
/// #pragma GCC poison/system_header/dependency and #pragma once.
void Preprocessor::RegisterBuiltinPragmas() {
AddPragmaHandler(0, new PragmaOnceHandler(getIdentifierInfo("once")));
AddPragmaHandler("GCC", new PragmaPoisonHandler(getIdentifierInfo("poison")));
AddPragmaHandler("GCC", new PragmaSystemHeaderHandler(
getIdentifierInfo("system_header")));
AddPragmaHandler("GCC", new PragmaDependencyHandler(
getIdentifierInfo("dependency")));
}