Move the parser for the linker script to a separate file.

LinkerScript.cpp contains both the linker script processor and the
linker script parser. I put both into a single file, but the file grown
too large, so it's time to put them into two different files.

llvm-svn: 299515

lld/ELF/CMakeLists.txt

@@ -24,6 +24,7 @@ add_lld_library(lldELF
   OutputSections.cpp
   Relocations.cpp
   ScriptLexer.cpp
+  ScriptParser.cpp
   Strings.cpp
   SymbolTable.cpp
   Symbols.cpp

lld/ELF/Driver.cpp

@@ -33,6 +33,7 @@
 #include "LinkerScript.h"
 #include "Memory.h"
 #include "OutputSections.h"
+#include "ScriptParser.h"
 #include "Strings.h"
 #include "SymbolTable.h"
 #include "Target.h"

lld/ELF/LinkerScript.h

@@ -57,15 +57,6 @@ struct ExprValue {
 // Later, we evaluate the expression by calling the function.
 typedef std::function<ExprValue()> Expr;
 
-// Parses a linker script. Calling this function updates
-// Config and ScriptConfig.
-void readLinkerScript(MemoryBufferRef MB);
-
-// Parses a version script.
-void readVersionScript(MemoryBufferRef MB);
-
-void readDynamicList(MemoryBufferRef MB);
-
 // This enum is used to implement linker script SECTIONS command.
 // https://sourceware.org/binutils/docs/ld/SECTIONS.html#SECTIONS
 enum SectionsCommandKind {

lld/ELF/ScriptParser.h

@@ -0,0 +1,31 @@
+//===- ScriptParser.h -------------------------------------------*- C++ -*-===//
+//
+//                             The LLVM Linker
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLD_ELF_SCRIPT_PARSER_H
+#define LLD_ELF_SCRIPT_PARSER_H
+
+#include "lld/Core/LLVM.h"
+#include "llvm/Support/MemoryBuffer.h"
+
+namespace lld {
+namespace elf {
+
+// Parses a linker script. Calling this function updates
+// Config and ScriptConfig.
+void readLinkerScript(MemoryBufferRef MB);
+
+// Parses a version script.
+void readVersionScript(MemoryBufferRef MB);
+
+void readDynamicList(MemoryBufferRef MB);
+
+} // namespace elf
+} // namespace lld
+
+#endif