MIPS: Implement loop for global regexps in regexp assembler.

Port r11623 (f153116d)

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10436012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11639 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/code-stubs-mips.cc

@@ -5043,7 +5043,7 @@ void RegExpExecStub::Generate(MacroAssembler* masm) {
                       1, a0, a2);
 
   // Isolates: note we add an additional parameter here (isolate pointer).
-  const int kRegExpExecuteArguments = 8;
+  const int kRegExpExecuteArguments = 9;
   const int kParameterRegisters = 4;
   __ EnterExitFrame(false, kRegExpExecuteArguments - kParameterRegisters);
 
@@ -5054,27 +5054,33 @@ void RegExpExecStub::Generate(MacroAssembler* masm) {
   // allocating space for the c argument slots, we don't need to calculate
   // that into the argument positions on the stack. This is how the stack will
   // look (sp meaning the value of sp at this moment):
+  // [sp + 5] - Argument 9
   // [sp + 4] - Argument 8
   // [sp + 3] - Argument 7
   // [sp + 2] - Argument 6
   // [sp + 1] - Argument 5
   // [sp + 0] - saved ra
 
-  // Argument 8: Pass current isolate address.
+  // Argument 9: Pass current isolate address.
   // CFunctionArgumentOperand handles MIPS stack argument slots.
   __ li(a0, Operand(ExternalReference::isolate_address()));
-  __ sw(a0, MemOperand(sp, 4 * kPointerSize));
+  __ sw(a0, MemOperand(sp, 5 * kPointerSize));
 
-  // Argument 7: Indicate that this is a direct call from JavaScript.
+  // Argument 8: Indicate that this is a direct call from JavaScript.
   __ li(a0, Operand(1));
-  __ sw(a0, MemOperand(sp, 3 * kPointerSize));
+  __ sw(a0, MemOperand(sp, 4 * kPointerSize));
 
-  // Argument 6: Start (high end) of backtracking stack memory area.
+  // Argument 7: Start (high end) of backtracking stack memory area.
   __ li(a0, Operand(address_of_regexp_stack_memory_address));
   __ lw(a0, MemOperand(a0, 0));
   __ li(a2, Operand(address_of_regexp_stack_memory_size));
   __ lw(a2, MemOperand(a2, 0));
   __ addu(a0, a0, a2);
+  __ sw(a0, MemOperand(sp, 3 * kPointerSize));
+
+  // Argument 6: Set the number of capture registers to zero to force global
+  // regexps to behave as non-global.  This does not affect non-global regexps.
+  __ mov(a0, zero_reg);
   __ sw(a0, MemOperand(sp, 2 * kPointerSize));
 
   // Argument 5: static offsets vector buffer.
@@ -5125,7 +5131,9 @@ void RegExpExecStub::Generate(MacroAssembler* masm) {
   // Check the result.
 
   Label success;
-  __ Branch(&success, eq, v0, Operand(NativeRegExpMacroAssembler::SUCCESS));
+  __ Branch(&success, eq, v0, Operand(1));
+  // We expect exactly one result since we force the called regexp to behave
+  // as non-global.
   Label failure;
   __ Branch(&failure, eq, v0, Operand(NativeRegExpMacroAssembler::FAILURE));
   // If not exception it can only be retry. Handle that in the runtime system.

src/mips/regexp-macro-assembler-mips.h

@@ -115,7 +115,7 @@ class RegExpMacroAssemblerMIPS: public NativeRegExpMacroAssembler {
   virtual void ReadStackPointerFromRegister(int reg);
   virtual void SetCurrentPositionFromEnd(int by);
   virtual void SetRegister(int register_index, int to);
-  virtual void Succeed();
+  virtual bool Succeed();
   virtual void WriteCurrentPositionToRegister(int reg, int cp_offset);
   virtual void ClearRegisters(int reg_from, int reg_to);
   virtual void WriteStackPointerToRegister(int reg);
@@ -141,7 +141,8 @@ class RegExpMacroAssemblerMIPS: public NativeRegExpMacroAssembler {
   static const int kStackFrameHeader = kReturnAddress + kPointerSize;
   // Stack parameters placed by caller.
   static const int kRegisterOutput = kStackFrameHeader + 20;
-  static const int kStackHighEnd = kRegisterOutput + kPointerSize;
+  static const int kNumOutputRegisters = kRegisterOutput + kPointerSize;
+  static const int kStackHighEnd = kNumOutputRegisters + kPointerSize;
   static const int kDirectCall = kStackHighEnd + kPointerSize;
   static const int kIsolate = kDirectCall + kPointerSize;
 
@@ -153,10 +154,10 @@ class RegExpMacroAssemblerMIPS: public NativeRegExpMacroAssembler {
   static const int kInputString = kStartIndex - kPointerSize;
   // When adding local variables remember to push space for them in
   // the frame in GetCode.
-  static const int kInputStartMinusOne = kInputString - kPointerSize;
-  static const int kAtStart = kInputStartMinusOne - kPointerSize;
+  static const int kSuccessfulCaptures = kInputString - kPointerSize;
+  static const int kInputStartMinusOne = kSuccessfulCaptures - kPointerSize;
   // First register address. Following registers are below it on the stack.
-  static const int kRegisterZero = kAtStart - kPointerSize;
+  static const int kRegisterZero = kInputStartMinusOne - kPointerSize;
 
   // Initial size of code buffer.
   static const size_t kRegExpCodeSize = 1024;

src/mips/simulator-mips.h

@@ -50,16 +50,16 @@ namespace internal {
   entry(p0, p1, p2, p3, p4)
 
 typedef int (*mips_regexp_matcher)(String*, int, const byte*, const byte*,
-                                   void*, int*, Address, int, Isolate*);
+                                   void*, int*, int, Address, int, Isolate*);
 
 
 // Call the generated regexp code directly. The code at the entry address
 // should act as a function matching the type arm_regexp_matcher.
 // The fifth argument is a dummy that reserves the space used for
 // the return address added by the ExitFrame in native calls.
-#define CALL_GENERATED_REGEXP_CODE(entry, p0, p1, p2, p3, p4, p5, p6, p7) \
+#define CALL_GENERATED_REGEXP_CODE(entry, p0, p1, p2, p3, p4, p5, p6, p7, p8) \
   (FUNCTION_CAST<mips_regexp_matcher>(entry)( \
-      p0, p1, p2, p3, NULL, p4, p5, p6, p7))
+      p0, p1, p2, p3, NULL, p4, p5, p6, p7, p8))
 
 #define TRY_CATCH_FROM_ADDRESS(try_catch_address) \
   reinterpret_cast<TryCatch*>(try_catch_address)
@@ -403,9 +403,9 @@ class Simulator {
     reinterpret_cast<Object*>(Simulator::current(Isolate::Current())->Call( \
       FUNCTION_ADDR(entry), 5, p0, p1, p2, p3, p4))
 
-#define CALL_GENERATED_REGEXP_CODE(entry, p0, p1, p2, p3, p4, p5, p6, p7) \
+#define CALL_GENERATED_REGEXP_CODE(entry, p0, p1, p2, p3, p4, p5, p6, p7, p8) \
     Simulator::current(Isolate::Current())->Call( \
-        entry, 9, p0, p1, p2, p3, NULL, p4, p5, p6, p7)
+        entry, 10, p0, p1, p2, p3, NULL, p4, p5, p6, p7, p8)
 
 #define TRY_CATCH_FROM_ADDRESS(try_catch_address)                              \
   try_catch_address == NULL ?                                                  \