Rewrite the tblgen parser in a recursive descent style, eliminating the bison parser.
This makes the parser much easier to understand, eliminates a ton of global variables,
and gives tblgen nice caret diagnostics. It is also faster, but tblgen probably doesn't
care about performance.
There are a couple of FIXMEs which I will take care of next.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44274 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/TableGen.cpp b/utils/TableGen/TableGen.cpp
index d3d241e..f4ece12 100644
--- a/utils/TableGen/TableGen.cpp
+++ b/utils/TableGen/TableGen.cpp
@@ -16,10 +16,12 @@
//===----------------------------------------------------------------------===//
#include "Record.h"
+#include "TGParser.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Streams.h"
#include "llvm/System/Signals.h"
#include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/MemoryBuffer.h"
#include "CallingConvEmitter.h"
#include "CodeEmitterGen.h"
#include "RegisterInfoEmitter.h"
@@ -93,16 +95,35 @@
cl::value_desc("directory"), cl::Prefix);
}
-namespace llvm {
- void ParseFile(const std::string &Filename,
- const std::vector<std::string> &IncludeDirs);
-}
-
RecordKeeper llvm::Records;
+/// ParseFile - this function begins the parsing of the specified tablegen
+/// file.
+static bool ParseFile(const std::string &Filename,
+ const std::vector<std::string> &IncludeDirs) {
+ std::string ErrorStr;
+ MemoryBuffer *F = MemoryBuffer::getFileOrSTDIN(&Filename[0], Filename.size(),
+ &ErrorStr);
+ if (F == 0) {
+ cerr << "Could not open input file '" + Filename + "': " << ErrorStr <<"\n";
+ return true;
+ }
+
+ TGParser Parser(F);
+
+ // Record the location of the include directory so that the lexer can find
+ // it later.
+ Parser.setIncludeDirs(IncludeDirs);
+
+ return Parser.ParseFile();
+}
+
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv);
- ParseFile(InputFilename, IncludeDirs);
+
+ // Parse the input file.
+ if (ParseFile(InputFilename, IncludeDirs))
+ return 1;
std::ostream *Out = cout.stream();
if (OutputFilename != "-") {