[ELF] --defsym: support quoted LHS

and move = splitting from Driver.cpp to ScriptParser.cpp.

Author: MaskRay

lld/ELF/Driver.cpp

@@ -1911,13 +1911,7 @@ void LinkerDriver::createFiles(opt::InputArgList &args) {
       hasInput = true;
       break;
     case OPT_defsym: {
-      StringRef from;
-      StringRef to;
-      std::tie(from, to) = StringRef(arg->getValue()).split('=');
-      if (from.empty() || to.empty())
-        error("--defsym: syntax error: " + StringRef(arg->getValue()));
-      else
-        readDefsym(from, MemoryBufferRef(to, "--defsym"));
+      readDefsym(MemoryBufferRef(arg->getValue(), "--defsym"));
       break;
     }
     case OPT_script:

lld/ELF/ScriptParser.cpp

@@ -53,7 +53,7 @@ class ScriptParser final : ScriptLexer {
   void readLinkerScript();
   void readVersionScript();
   void readDynamicList();
-  void readDefsym(StringRef name);
+  void readDefsym();
 
 private:
   void addFile(StringRef path);
@@ -283,9 +283,12 @@ void ScriptParser::readLinkerScript() {
   }
 }
 
-void ScriptParser::readDefsym(StringRef name) {
+void ScriptParser::readDefsym() {
   if (errorCount())
     return;
+  inExpr = true;
+  StringRef name = readName();
+  expect("=");
   Expr e = readExpr();
   if (!atEOF())
     setError("EOF expected, but got " + next());
@@ -1854,7 +1857,4 @@ void elf::readDynamicList(MemoryBufferRef mb) {
   ScriptParser(mb).readDynamicList();
 }
 
-void elf::readDefsym(StringRef name, MemoryBufferRef mb) {
-  llvm::TimeTraceScope timeScope("Read defsym input", name);
-  ScriptParser(mb).readDefsym(name);
-}
+void elf::readDefsym(MemoryBufferRef mb) { ScriptParser(mb).readDefsym(); }

lld/ELF/ScriptParser.h

@@ -24,7 +24,7 @@ void readVersionScript(MemoryBufferRef mb);
 void readDynamicList(MemoryBufferRef mb);
 
 // Parses the defsym expression.
-void readDefsym(StringRef name, MemoryBufferRef mb);
+void readDefsym(MemoryBufferRef mb);
 
 bool hasWildcard(StringRef s);
 

lld/test/ELF/defsym.s

@@ -5,14 +5,16 @@
 # RUN: llvm-objdump -d --print-imm-hex %t | FileCheck %s --check-prefix=USE
 
 ## Check that we accept --defsym foo2=foo1 form.
-# RUN: ld.lld -o %t2 %t.o --defsym foo2=foo1
+# RUN: ld.lld -o %t2 %t.o --defsym '"foo2"=foo1'
 # RUN: llvm-readelf -s %t2 | FileCheck %s
 # RUN: llvm-objdump -d --print-imm-hex %t2 | FileCheck %s --check-prefix=USE
 
 ## Check we are reporting the error correctly and don't crash
 ## when handling the second --defsym.
-# RUN: not ld.lld -o /dev/null %t.o --defsym ERR+ --defsym foo2=foo1 2>&1 | FileCheck %s --check-prefix=ERR
-# ERR: error: --defsym: syntax error: ERR+
+# RUN: not ld.lld -o /dev/null %t.o --defsym ERR+ --defsym foo2=foo1 2>&1 | FileCheck %s --check-prefix=ERR --strict-whitespace
+#      ERR:error: --defsym:1: = expected, but got +
+# ERR-NEXT:>>> ERR+
+# ERR-NEXT:>>>    ^
 
 # CHECK-DAG: 0000000000000123     0 NOTYPE  GLOBAL DEFAULT   ABS foo1
 # CHECK-DAG: 0000000000000123     0 NOTYPE  GLOBAL DEFAULT   ABS foo2
@@ -41,10 +43,9 @@
 # ERR2: error: --defsym:1: EOF expected, but got ,
 
 # RUN: not ld.lld -o /dev/null %t.o --defsym=foo 2>&1 | FileCheck %s -check-prefix=ERR3
-# ERR3: error: --defsym: syntax error: foo
+# ERR3: error: --defsym:1: unexpected EOF
 
-# RUN: not ld.lld -o /dev/null %t.o --defsym= 2>&1 | FileCheck %s -check-prefix=ERR4
-# ERR4: error: --defsym: syntax error:
+# RUN: not ld.lld -o /dev/null %t.o --defsym= 2>&1 | FileCheck %s -check-prefix=ERR3
 
 .globl foo1
  foo1 = 0x123