Re-establish mips basic infrastructure.

This commit adds current working versions of assembler, macro-assembler,
disassembler, and simulator.

All other mips arch files are replaced with stubbed-out versions that
will build.

Arch independent files are updated as needed to support building and
running mips.

The only test is cctest/test-assembler-mips, and this passes on the
simulator and on mips hardware.

TEST=none
BUG=none

Patch by Paul Lind from MIPS.

Review URL: http://codereview.chromium.org/6730029/


git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7388 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

SConstruct

@@ -224,14 +224,37 @@ LIBRARY_FLAGS = {
     },
     'arch:mips': {
       'CPPDEFINES':   ['V8_TARGET_ARCH_MIPS'],
+      'mips_arch_variant:mips32r2': {
+        'CPPDEFINES':    ['_MIPS_ARCH_MIPS32R2']
+      },
       'simulator:none': {
-        'CCFLAGS':      ['-EL', '-mips32r2', '-Wa,-mips32r2', '-fno-inline'],
-        'LDFLAGS':      ['-EL']
+        'CCFLAGS':      ['-EL'],
+        'LINKFLAGS':    ['-EL'],
+        'mips_arch_variant:mips32r2': {
+          'CCFLAGS':      ['-mips32r2', '-Wa,-mips32r2']
+        },
+        'mips_arch_variant:mips32r1': {
+          'CCFLAGS':      ['-mips32', '-Wa,-mips32']
+        },
+        'library:static': {
+          'LINKFLAGS':    ['-static', '-static-libgcc']
+        },
+        'mipsabi:softfloat': {
+          'CCFLAGS':      ['-msoft-float'],
+          'LINKFLAGS':    ['-msoft-float']
+        },
+        'mipsabi:hardfloat': {
+          'CCFLAGS':      ['-mhard-float'],
+          'LINKFLAGS':    ['-mhard-float']
+        }
       }
     },
     'simulator:mips': {
       'CCFLAGS':      ['-m32'],
       'LINKFLAGS':    ['-m32'],
+      'mipsabi:softfloat': {
+        'CPPDEFINES':    ['__mips_soft_float=1'],
+      }
     },
     'arch:x64': {
       'CPPDEFINES':   ['V8_TARGET_ARCH_X64'],
@@ -345,6 +368,9 @@ V8_EXTRA_FLAGS = {
     },
     'arch:mips': {
       'CPPDEFINES':   ['V8_TARGET_ARCH_MIPS'],
+      'mips_arch_variant:mips32r2': {
+        'CPPDEFINES':    ['_MIPS_ARCH_MIPS32R2']
+      },
     },
     'disassembler:on': {
       'CPPDEFINES':   ['ENABLE_DISASSEMBLER']
@@ -519,10 +545,29 @@ SAMPLE_FLAGS = {
     },
     'arch:mips': {
       'CPPDEFINES':   ['V8_TARGET_ARCH_MIPS'],
+      'mips_arch_variant:mips32r2': {
+        'CPPDEFINES':    ['_MIPS_ARCH_MIPS32R2']
+      },
       'simulator:none': {
-        'CCFLAGS':      ['-EL', '-mips32r2', '-Wa,-mips32r2', '-fno-inline'],
+        'CCFLAGS':      ['-EL'],
         'LINKFLAGS':    ['-EL'],
-        'LDFLAGS':      ['-EL']
+        'mips_arch_variant:mips32r2': {
+          'CCFLAGS':      ['-mips32r2', '-Wa,-mips32r2']
+        },
+        'mips_arch_variant:mips32r1': {
+          'CCFLAGS':      ['-mips32', '-Wa,-mips32']
+        },
+        'library:static': {
+          'LINKFLAGS':    ['-static', '-static-libgcc']
+        },
+        'mipsabi:softfloat': {
+          'CCFLAGS':      ['-msoft-float'],
+          'LINKFLAGS':    ['-msoft-float']
+        },
+        'mipsabi:hardfloat': {
+          'CCFLAGS':      ['-mhard-float'],
+          'LINKFLAGS':    ['-mhard-float']
+        }
       }
     },
     'simulator:arm': {
@@ -531,7 +576,10 @@ SAMPLE_FLAGS = {
     },
     'simulator:mips': {
       'CCFLAGS':      ['-m32'],
-      'LINKFLAGS':    ['-m32']
+      'LINKFLAGS':    ['-m32'],
+      'mipsabi:softfloat': {
+        'CPPDEFINES':    ['__mips_soft_float=1'],
+      }
     },
     'mode:release': {
       'CCFLAGS':      ['-O2']
@@ -818,6 +866,16 @@ SIMPLE_OPTIONS = {
     'values': ['off', 'instrument', 'optimize'],
     'default': 'off',
     'help': 'select profile guided optimization variant',
+  },
+  'mipsabi': {
+    'values': ['hardfloat', 'softfloat', 'none'],
+    'default': 'hardfloat',
+    'help': 'generate calling conventiont according to selected mips ABI'
+  },
+  'mips_arch_variant': {
+    'values': ['mips32r2', 'mips32r1'],
+    'default': 'mips32r2',
+    'help': 'mips variant'
   }
 }
 
@@ -1014,11 +1072,12 @@ def PostprocessOptions(options, os):
     if 'msvcltcg' in ARGUMENTS:
       print "Warning: forcing msvcltcg on as it is required for pgo (%s)" % options['pgo']
     options['msvcltcg'] = 'on'
-  if options['arch'] == 'mips':
-    if ('regexp' in ARGUMENTS) and options['regexp'] == 'native':
-      # Print a warning if native regexp is specified for mips
-      print "Warning: forcing regexp to interpreted for mips"
-    options['regexp'] = 'interpreted'
+    if (options['simulator'] == 'mips' and options['mipsabi'] != 'softfloat'):
+      # Print a warning if soft-float ABI is not selected for mips simulator
+      print "Warning: forcing soft-float mips ABI when running on simulator"
+      options['mipsabi'] = 'softfloat'
+    if (options['mipsabi'] != 'none') and (options['arch'] != 'mips') and (options['simulator'] != 'mips'):
+      options['mipsabi'] = 'none'
   if options['liveobjectlist'] == 'on':
     if (options['debuggersupport'] != 'on') or (options['mode'] == 'release'):
       # Print a warning that liveobjectlist will implicitly enable the debugger

src/SConscript

@@ -163,18 +163,23 @@ SOURCES = {
     arm/assembler-arm.cc
     """),
   'arch:mips': Split("""
+    jump-target-light.cc
+    virtual-frame-light.cc
     mips/assembler-mips.cc
     mips/builtins-mips.cc
+    mips/code-stubs-mips.cc
     mips/codegen-mips.cc
     mips/constants-mips.cc
     mips/cpu-mips.cc
     mips/debug-mips.cc
+    mips/deoptimizer-mips.cc
     mips/disasm-mips.cc
-    mips/full-codegen-mips.cc
     mips/frames-mips.cc
+    mips/full-codegen-mips.cc
     mips/ic-mips.cc
     mips/jump-target-mips.cc
     mips/macro-assembler-mips.cc
+    mips/regexp-macro-assembler-mips.cc
     mips/register-allocator-mips.cc
     mips/stub-cache-mips.cc
     mips/virtual-frame-mips.cc

src/assembler.cc

@@ -55,6 +55,8 @@
 #include "x64/regexp-macro-assembler-x64.h"
 #elif V8_TARGET_ARCH_ARM
 #include "arm/regexp-macro-assembler-arm.h"
+#elif V8_TARGET_ARCH_MIPS
+#include "mips/regexp-macro-assembler-mips.h"
 #else  // Unknown architecture.
 #error "Unknown architecture."
 #endif  // Target architecture.
@@ -795,6 +797,8 @@ ExternalReference ExternalReference::re_check_stack_guard_state(
   function = FUNCTION_ADDR(RegExpMacroAssemblerIA32::CheckStackGuardState);
 #elif V8_TARGET_ARCH_ARM
   function = FUNCTION_ADDR(RegExpMacroAssemblerARM::CheckStackGuardState);
+#elif V8_TARGET_ARCH_MIPS
+  function = FUNCTION_ADDR(RegExpMacroAssemblerMIPS::CheckStackGuardState);
 #else
   UNREACHABLE();
 #endif

src/atomicops.h

@@ -158,6 +158,8 @@ Atomic64 Release_Load(volatile const Atomic64* ptr);
 #include "atomicops_internals_x86_gcc.h"
 #elif defined(__GNUC__) && defined(V8_HOST_ARCH_ARM)
 #include "atomicops_internals_arm_gcc.h"
+#elif defined(__GNUC__) && defined(V8_HOST_ARCH_MIPS)
+#include "atomicops_internals_mips_gcc.h"
 #else
 #error "Atomic operations are not supported on your platform"
 #endif

src/atomicops_internals_mips_gcc.h

+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// This file is an internal atomic implementation, use atomicops.h instead.
+
+#ifndef V8_ATOMICOPS_INTERNALS_MIPS_GCC_H_
+#define V8_ATOMICOPS_INTERNALS_MIPS_GCC_H_
+
+#define ATOMICOPS_COMPILER_BARRIER() __asm__ __volatile__("sync" : : : "memory")
+
+namespace v8 {
+namespace internal {
+
+// Atomically execute:
+//      result = *ptr;
+//      if (*ptr == old_value)
+//        *ptr = new_value;
+//      return result;
+//
+// I.e., replace "*ptr" with "new_value" if "*ptr" used to be "old_value".
+// Always return the old value of "*ptr"
+//
+// This routine implies no memory barriers.
+inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
+                                         Atomic32 old_value,
+                                         Atomic32 new_value) {
+  Atomic32 prev;
+  __asm__ __volatile__("1:\n"
+                       "ll %0, %1\n"  // prev = *ptr
+                       "bne %0, %3, 2f\n"  // if (prev != old_value) goto 2
+                       "nop\n"  // delay slot nop
+                       "sc %2, %1\n"  // *ptr = new_value (with atomic check)
+                       "beqz %2, 1b\n"  // start again on atomic error
+                       "nop\n"  // delay slot nop
+                       "2:\n"
+                       : "=&r" (prev), "=m" (*ptr), "+&r" (new_value)
+                       : "Ir" (old_value), "r" (new_value), "m" (*ptr)
+                       : "memory");
+  return prev;
+}
+
+// Atomically store new_value into *ptr, returning the previous value held in
+// *ptr.  This routine implies no memory barriers.
+inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
+                                         Atomic32 new_value) {
+  Atomic32 temp, old;
+  __asm__ __volatile__("1:\n"
+                       "ll %1, %2\n"  // old = *ptr
+                       "move %0, %3\n"  // temp = new_value
+                       "sc %0, %2\n"  // *ptr = temp (with atomic check)
+                       "beqz %0, 1b\n"  // start again on atomic error
+                       "nop\n"  // delay slot nop
+                       : "=&r" (temp), "=&r" (old), "=m" (*ptr)
+                       : "r" (new_value), "m" (*ptr)
+                       : "memory");
+
+  return old;
+}
+
+// Atomically increment *ptr by "increment".  Returns the new value of
+// *ptr with the increment applied.  This routine implies no memory barriers.
+inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
+                                          Atomic32 increment) {
+  Atomic32 temp, temp2;
+
+  __asm__ __volatile__("1:\n"
+                       "ll %0, %2\n"  // temp = *ptr
+                       "addu %0, %3\n"  // temp = temp + increment
+                       "move %1, %0\n"  // temp2 = temp
+                       "sc %0, %2\n"  // *ptr = temp (with atomic check)
+                       "beqz %0, 1b\n"  // start again on atomic error
+                       "nop\n"  // delay slot nop
+                       : "=&r" (temp), "=&r" (temp2), "=m" (*ptr)
+                       : "Ir" (increment), "m" (*ptr)
+                       : "memory");
+  // temp2 now holds the final value.
+  return temp2;
+}
+
+inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
+                                        Atomic32 increment) {
+  Atomic32 res = NoBarrier_AtomicIncrement(ptr, increment);
+  ATOMICOPS_COMPILER_BARRIER();
+  return res;
+}
+
+// "Acquire" operations
+// ensure that no later memory access can be reordered ahead of the operation.
+// "Release" operations ensure that no previous memory access can be reordered
+// after the operation.  "Barrier" operations have both "Acquire" and "Release"
+// semantics.   A MemoryBarrier() has "Barrier" semantics, but does no memory
+// access.
+inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
+                                       Atomic32 old_value,
+                                       Atomic32 new_value) {
+  Atomic32 x = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
+  ATOMICOPS_COMPILER_BARRIER();
+  return x;
+}
+
+inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
+                                       Atomic32 old_value,
+                                       Atomic32 new_value) {
+  ATOMICOPS_COMPILER_BARRIER();
+  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
+}
+
+inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
+  *ptr = value;
+}
+
+inline void MemoryBarrier() {
+  ATOMICOPS_COMPILER_BARRIER();
+}
+
+inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
+  *ptr = value;
+  MemoryBarrier();
+}
+
+inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
+  MemoryBarrier();
+  *ptr = value;
+}
+
+inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
+  return *ptr;
+}
+
+inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
+  Atomic32 value = *ptr;
+  MemoryBarrier();
+  return value;
+}
+
+inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
+  MemoryBarrier();
+  return *ptr;
+}
+
+} }  // namespace v8::internal
+
+#undef ATOMICOPS_COMPILER_BARRIER
+
+#endif  // V8_ATOMICOPS_INTERNALS_MIPS_GCC_H_

src/code-stubs.h

@@ -80,10 +80,19 @@ namespace internal {
 #define CODE_STUB_LIST_ARM(V)
 #endif
 
+// List of code stubs only used on MIPS platforms.
+#ifdef V8_TARGET_ARCH_MIPS
+#define CODE_STUB_LIST_MIPS(V)  \
+  V(RegExpCEntry)
+#else
+#define CODE_STUB_LIST_MIPS(V)
+#endif
+
 // Combined list of code stubs.
 #define CODE_STUB_LIST(V)            \
   CODE_STUB_LIST_ALL_PLATFORMS(V)    \
-  CODE_STUB_LIST_ARM(V)
+  CODE_STUB_LIST_ARM(V)              \
+  CODE_STUB_LIST_MIPS(V)
 
 // Mode to overwrite BinaryExpression values.
 enum OverwriteMode { NO_OVERWRITE, OVERWRITE_LEFT, OVERWRITE_RIGHT };

src/flag-definitions.h

@@ -97,7 +97,11 @@ private:
 #define FLAG FLAG_FULL
 
 // Flags for Crankshaft.
-DEFINE_bool(crankshaft, true, "use crankshaft")
+#ifdef V8_TARGET_ARCH_MIPS
+  DEFINE_bool(crankshaft, false, "use crankshaft")
+#else
+  DEFINE_bool(crankshaft, true, "use crankshaft")
+#endif
 DEFINE_string(hydrogen_filter, "", "hydrogen use/trace filter")
 DEFINE_bool(use_hydrogen, true, "use generated hydrogen for compilation")
 DEFINE_bool(build_lithium, true, "use lithium chunk builder")
@@ -161,6 +165,8 @@ DEFINE_bool(enable_vfp3, true,
             "enable use of VFP3 instructions if available (ARM only)")
 DEFINE_bool(enable_armv7, true,
             "enable use of ARMv7 instructions if available (ARM only)")
+DEFINE_bool(enable_fpu, true,
+            "enable use of MIPS FPU instructions if available (MIPS only)")
 
 // bootstrapper.cc
 DEFINE_string(expose_natives_as, NULL, "expose natives in global object")

src/globals.h

@@ -54,7 +54,7 @@ namespace internal {
 #if CAN_USE_UNALIGNED_ACCESSES
 #define V8_HOST_CAN_READ_UNALIGNED 1
 #endif
-#elif defined(_MIPS_ARCH_MIPS32R2)
+#elif defined(__MIPSEL__)
 #define V8_HOST_ARCH_MIPS 1
 #define V8_HOST_ARCH_32_BIT 1
 #else
@@ -72,7 +72,7 @@ namespace internal {
 #define V8_TARGET_ARCH_IA32 1
 #elif defined(__ARMEL__)
 #define V8_TARGET_ARCH_ARM 1
-#elif defined(_MIPS_ARCH_MIPS32R2)
+#elif defined(__MIPSEL__)
 #define V8_TARGET_ARCH_MIPS 1
 #else
 #error Target architecture was not detected as supported by v8

src/heap.cc

@@ -49,6 +49,10 @@
 #include "regexp-macro-assembler.h"
 #include "arm/regexp-macro-assembler-arm.h"
 #endif
+#if V8_TARGET_ARCH_MIPS && !V8_INTERPRETED_REGEXP
+#include "regexp-macro-assembler.h"
+#include "mips/regexp-macro-assembler-mips.h"
+#endif
 
 namespace v8 {
 namespace internal {

src/hydrogen-instructions.cc

@@ -36,6 +36,8 @@
 #include "x64/lithium-x64.h"
 #elif V8_TARGET_ARCH_ARM
 #include "arm/lithium-arm.h"
+#elif V8_TARGET_ARCH_MIPS
+#include "mips/lithium-mips.h"
 #else
 #error Unsupported target architecture.
 #endif

src/hydrogen.cc

@@ -43,6 +43,8 @@
 #include "x64/lithium-codegen-x64.h"
 #elif V8_TARGET_ARCH_ARM
 #include "arm/lithium-codegen-arm.h"
+#elif V8_TARGET_ARCH_MIPS
+#include "mips/lithium-codegen-mips.h"
 #else
 #error Unsupported target architecture.
 #endif

src/isolate.cc

@@ -382,7 +382,8 @@ Isolate::Isolate()
   zone_.isolate_ = this;
   stack_guard_.isolate_ = this;
 
-#if defined(V8_TARGET_ARCH_ARM) && !defined(__arm__)
+#if defined(V8_TARGET_ARCH_ARM) && !defined(__arm__) || \
+    defined(V8_TARGET_ARCH_MIPS) && !defined(__mips__)
   simulator_initialized_ = false;
   simulator_i_cache_ = NULL;
   simulator_redirection_ = NULL;
@@ -658,10 +659,8 @@ bool Isolate::Init(Deserializer* des) {
 
   // Initialize other runtime facilities
 #if defined(USE_SIMULATOR)
-#if defined(V8_TARGET_ARCH_ARM)
+#if defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_MIPS)
   Simulator::Initialize();
-#elif defined(V8_TARGET_ARCH_MIPS)
-  ::assembler::mips::Simulator::Initialize();
 #endif
 #endif
 

src/isolate.h

@@ -93,11 +93,13 @@ class Debugger;
 class DebuggerAgent;
 #endif
 
-#if !defined(__arm__) && defined(V8_TARGET_ARCH_ARM)
+#if !defined(__arm__) && defined(V8_TARGET_ARCH_ARM) || \
+    !defined(__mips__) && defined(V8_TARGET_ARCH_MIPS)
 class Redirection;
 class Simulator;
 #endif
 
+
 // Static indirection table for handles to constants.  If a frame
 // element represents a constant, the data contains an index into
 // this table of handles to the actual constants.
@@ -195,10 +197,8 @@ class ThreadLocalTop BASE_EMBEDDED {
   Address handler_;   // try-blocks are chained through the stack
 
 #ifdef USE_SIMULATOR
-#ifdef V8_TARGET_ARCH_ARM
+#if defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_MIPS)
   Simulator* simulator_;
-#elif V8_TARGET_ARCH_MIPS
-  assembler::mips::Simulator* simulator_;
 #endif
 #endif  // USE_SIMULATOR
 
@@ -221,7 +221,7 @@ class ThreadLocalTop BASE_EMBEDDED {
   Address try_catch_handler_address_;
 };
 
-#if defined(V8_TARGET_ARCH_ARM)
+#if defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_MIPS)
 
 #define ISOLATE_PLATFORM_INIT_LIST(V)                                          \
   /* VirtualFrame::SpilledScope state */                                       \
@@ -229,7 +229,7 @@ class ThreadLocalTop BASE_EMBEDDED {
   /* CodeGenerator::EmitNamedStore state */                                    \
   V(int, inlined_write_barrier_size, -1)
 
-#if !defined(__arm__)
+#if !defined(__arm__) && !defined(__mips__)
 class HashMap;
 #endif
 
@@ -341,7 +341,8 @@ class Isolate {
           thread_id_(thread_id),
           stack_limit_(0),
           thread_state_(NULL),
-#if !defined(__arm__) && defined(V8_TARGET_ARCH_ARM)
+#if !defined(__arm__) && defined(V8_TARGET_ARCH_ARM) || \
+    !defined(__mips__) && defined(V8_TARGET_ARCH_MIPS)
           simulator_(NULL),
 #endif
           next_(NULL),
@@ -353,7 +354,8 @@ class Isolate {
     ThreadState* thread_state() const { return thread_state_; }
     void set_thread_state(ThreadState* value) { thread_state_ = value; }
 
-#if !defined(__arm__) && defined(V8_TARGET_ARCH_ARM)
+#if !defined(__arm__) && defined(V8_TARGET_ARCH_ARM) || \
+    !defined(__mips__) && defined(V8_TARGET_ARCH_MIPS)
     Simulator* simulator() const { return simulator_; }
     void set_simulator(Simulator* simulator) {
       simulator_ = simulator;
@@ -370,7 +372,8 @@ class Isolate {
     uintptr_t stack_limit_;
     ThreadState* thread_state_;
 
-#if !defined(__arm__) && defined(V8_TARGET_ARCH_ARM)
+#if !defined(__arm__) && defined(V8_TARGET_ARCH_ARM) || \
+    !defined(__mips__) && defined(V8_TARGET_ARCH_MIPS)
     Simulator* simulator_;
 #endif
 
@@ -854,7 +857,8 @@ class Isolate {
   int* code_kind_statistics() { return code_kind_statistics_; }
 #endif
 
-#if defined(V8_TARGET_ARCH_ARM) && !defined(__arm__)
+#if defined(V8_TARGET_ARCH_ARM) && !defined(__arm__) || \
+    defined(V8_TARGET_ARCH_MIPS) && !defined(__mips__)
   bool simulator_initialized() { return simulator_initialized_; }
   void set_simulator_initialized(bool initialized) {
     simulator_initialized_ = initialized;
@@ -1076,7 +1080,8 @@ class Isolate {
   ZoneObjectList frame_element_constant_list_;
   ZoneObjectList result_constant_list_;
 
-#if defined(V8_TARGET_ARCH_ARM) && !defined(__arm__)
+#if defined(V8_TARGET_ARCH_ARM) && !defined(__arm__) || \
+    defined(V8_TARGET_ARCH_MIPS) && !defined(__mips__)
   bool simulator_initialized_;
   HashMap* simulator_i_cache_;
   Redirection* simulator_redirection_;

src/jsregexp.cc

@@ -50,6 +50,8 @@
 #include "x64/regexp-macro-assembler-x64.h"
 #elif V8_TARGET_ARCH_ARM
 #include "arm/regexp-macro-assembler-arm.h"
+#elif V8_TARGET_ARCH_MIPS
+#include "mips/regexp-macro-assembler-mips.h"
 #else
 #error Unsupported target architecture.
 #endif
@@ -5340,6 +5342,8 @@ RegExpEngine::CompilationResult RegExpEngine::Compile(RegExpCompileData* data,
   RegExpMacroAssemblerX64 macro_assembler(mode, (data->capture_count + 1) * 2);
 #elif V8_TARGET_ARCH_ARM
   RegExpMacroAssemblerARM macro_assembler(mode, (data->capture_count + 1) * 2);
+#elif V8_TARGET_ARCH_MIPS
+  RegExpMacroAssemblerMIPS macro_assembler(mode, (data->capture_count + 1) * 2);
 #endif
 
 #else  // V8_INTERPRETED_REGEXP

src/lithium-allocator-inl.h

@@ -36,6 +36,8 @@
 #include "x64/lithium-x64.h"
 #elif V8_TARGET_ARCH_ARM
 #include "arm/lithium-arm.h"
+#elif V8_TARGET_ARCH_MIPS
+#include "mips/lithium-mips.h"
 #else
 #error "Unknown architecture."
 #endif

src/lithium-allocator.cc

@@ -37,6 +37,8 @@
 #include "x64/lithium-x64.h"
 #elif V8_TARGET_ARCH_ARM
 #include "arm/lithium-arm.h"
+#elif V8_TARGET_ARCH_MIPS
+#include "mips/lithium-mips.h"
 #else
 #error "Unknown architecture."
 #endif

src/mips/assembler-mips-inl.h

@@ -38,20 +38,12 @@
 
 #include "mips/assembler-mips.h"
 #include "cpu.h"
+#include "debug.h"
 
 
 namespace v8 {
 namespace internal {
 
-// -----------------------------------------------------------------------------
-// Condition
-
-Condition NegateCondition(Condition cc) {
-  ASSERT(cc != cc_always);
-  return static_cast<Condition>(cc ^ 1);
-}
-
-
 // -----------------------------------------------------------------------------
 // Operand and MemOperand
 
@@ -61,17 +53,13 @@ Operand::Operand(int32_t immediate, RelocInfo::Mode rmode)  {
   rmode_ = rmode;
 }
 
+
 Operand::Operand(const ExternalReference& f)  {
   rm_ = no_reg;
   imm32_ = reinterpret_cast<int32_t>(f.address());
   rmode_ = RelocInfo::EXTERNAL_REFERENCE;
 }
 
-Operand::Operand(const char* s) {
-  rm_ = no_reg;
-  imm32_ = reinterpret_cast<int32_t>(s);
-  rmode_ = RelocInfo::EMBEDDED_STRING;
-}
 
 Operand::Operand(Smi* value) {
   rm_ = no_reg;
@@ -79,10 +67,12 @@ Operand::Operand(Smi* value) {
   rmode_ = RelocInfo::NONE;
 }
 
+
 Operand::Operand(Register rm) {
   rm_ = rm;
 }
 
+
 bool Operand::is_reg() const {
   return rm_.is_valid();
 }
@@ -105,8 +95,29 @@ Address RelocInfo::target_address() {
 
 
 Address RelocInfo::target_address_address() {
-  ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
-  return reinterpret_cast<Address>(pc_);
+  ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY
+                              || rmode_ == EMBEDDED_OBJECT
+                              || rmode_ == EXTERNAL_REFERENCE);
+  // Read the address of the word containing the target_address in an
+  // instruction stream.
+  // The only architecture-independent user of this function is the serializer.
+  // The serializer uses it to find out how many raw bytes of instruction to
+  // output before the next target.
+  // For an instructions like LUI/ORI where the target bits are mixed into the
+  // instruction bits, the size of the target will be zero, indicating that the
+  // serializer should not step forward in memory after a target is resolved
+  // and written.  In this case the target_address_address function should
+  // return the end of the instructions to be patched, allowing the
+  // deserializer to deserialize the instructions as raw bytes and put them in
+  // place, ready to be patched with the target. In our case, that is the
+  // address of the instruction that follows LUI/ORI instruction pair.
+  return reinterpret_cast<Address>(
+    pc_ + Assembler::kInstructionsFor32BitConstant * Assembler::kInstrSize);
+}
+
+
+int RelocInfo::target_address_size() {
+  return Assembler::kExternalTargetSize;
 }
 
 
@@ -130,8 +141,15 @@ Handle<Object> RelocInfo::target_object_handle(Assembler *origin) {
 
 
 Object** RelocInfo::target_object_address() {
+  // Provide a "natural pointer" to the embedded object,
+  // which can be de-referenced during heap iteration.
   ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
-  return reinterpret_cast<Object**>(pc_);
+  // TODO(mips): Commenting out, to simplify arch-independent changes.
+  // GC won't work like this, but this commit is for asm/disasm/sim.
+  // reconstructed_obj_ptr_ =
+  //   reinterpret_cast<Object*>(Assembler::target_address_at(pc_));
+  // return &reconstructed_obj_ptr_;
+  return NULL;
 }
 
 
@@ -143,23 +161,55 @@ void RelocInfo::set_target_object(Object* target) {
 
 Address* RelocInfo::target_reference_address() {
   ASSERT(rmode_ == EXTERNAL_REFERENCE);
-  return reinterpret_cast<Address*>(pc_);
+  // TODO(mips): Commenting out, to simplify arch-independent changes.
+  // GC won't work like this, but this commit is for asm/disasm/sim.
+  // reconstructed_adr_ptr_ = Assembler::target_address_at(pc_);
+  // return &reconstructed_adr_ptr_;
+  return NULL;
+}
+
+
+Handle<JSGlobalPropertyCell> RelocInfo::target_cell_handle() {
+  ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
+  Address address = Memory::Address_at(pc_);
+  return Handle<JSGlobalPropertyCell>(
+      reinterpret_cast<JSGlobalPropertyCell**>(address));
+}
+
+
+JSGlobalPropertyCell* RelocInfo::target_cell() {
+  ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
+  Address address = Memory::Address_at(pc_);
+  Object* object = HeapObject::FromAddress(
+      address - JSGlobalPropertyCell::kValueOffset);
+  return reinterpret_cast<JSGlobalPropertyCell*>(object);
+}
+
+
+void RelocInfo::set_target_cell(JSGlobalPropertyCell* cell) {
+  ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
+  Address address = cell->address() + JSGlobalPropertyCell::kValueOffset;
+  Memory::Address_at(pc_) = address;
 }
 
 
 Address RelocInfo::call_address() {
-  ASSERT(IsPatchedReturnSequence());
-  // The 2 instructions offset assumes patched return sequence.
-  ASSERT(IsJSReturn(rmode()));
-  return Memory::Address_at(pc_ + 2 * Assembler::kInstrSize);
+  ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
+         (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
+  // The pc_ offset of 0 assumes mips patched return sequence per
+  // debug-mips.cc BreakLocationIterator::SetDebugBreakAtReturn(), or
+  // debug break slot per BreakLocationIterator::SetDebugBreakAtSlot().
+  return Assembler::target_address_at(pc_);
 }
 
 
 void RelocInfo::set_call_address(Address target) {
-  ASSERT(IsPatchedReturnSequence());
-  // The 2 instructions offset assumes patched return sequence.
-  ASSERT(IsJSReturn(rmode()));
-  Memory::Address_at(pc_ + 2 * Assembler::kInstrSize) = target;
+  ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
+         (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
+  // The pc_ offset of 0 assumes mips patched return sequence per
+  // debug-mips.cc BreakLocationIterator::SetDebugBreakAtReturn(), or
+  // debug break slot per BreakLocationIterator::SetDebugBreakAtSlot().
+  Assembler::set_target_address_at(pc_, target);
 }
 
 
@@ -169,9 +219,8 @@ Object* RelocInfo::call_object() {
 
 
 Object** RelocInfo::call_object_address() {
-  ASSERT(IsPatchedReturnSequence());
-  // The 2 instructions offset assumes patched return sequence.
-  ASSERT(IsJSReturn(rmode()));
+  ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
+         (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
   return reinterpret_cast<Object**>(pc_ + 2 * Assembler::kInstrSize);
 }
 
@@ -182,13 +231,76 @@ void RelocInfo::set_call_object(Object* target) {
 
 
 bool RelocInfo::IsPatchedReturnSequence() {
-#ifdef DEBUG
-  PrintF("%s - %d - %s : Checking for jal(r)",
-      __FILE__, __LINE__, __func__);
+  Instr instr0 = Assembler::instr_at(pc_);
+  Instr instr1 = Assembler::instr_at(pc_ + 1 * Assembler::kInstrSize);
+  Instr instr2 = Assembler::instr_at(pc_ + 2 * Assembler::kInstrSize);
+  bool patched_return = ((instr0 & kOpcodeMask) == LUI &&
+                         (instr1 & kOpcodeMask) == ORI &&
+                         (instr2 & kOpcodeMask) == SPECIAL &&
+                         (instr2 & kFunctionFieldMask) == JALR);
+  return patched_return;
+}
+
+
+bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
+  Instr current_instr = Assembler::instr_at(pc_);
+  return !Assembler::IsNop(current_instr, Assembler::DEBUG_BREAK_NOP);
+}
+
+
+void RelocInfo::Visit(ObjectVisitor* visitor) {
+  RelocInfo::Mode mode = rmode();
+  if (mode == RelocInfo::EMBEDDED_OBJECT) {
+    // RelocInfo is needed when pointer must be updated/serialized, such as
+    // UpdatingVisitor in mark-compact.cc or Serializer in serialize.cc.
+    // It is ignored by visitors that do not need it.
+    // Commenting out, to simplify arch-independednt changes.
+    // GC won't work like this, but this commit is for asm/disasm/sim.
+    // visitor->VisitPointer(target_object_address(), this);
+  } else if (RelocInfo::IsCodeTarget(mode)) {
+    visitor->VisitCodeTarget(this);
+  } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
+    // RelocInfo is needed when external-references must be serialized by
+    // Serializer Visitor in serialize.cc. It is ignored by visitors that
+    // do not need it.
+    // Commenting out, to simplify arch-independednt changes.
+    // Serializer won't work like this, but this commit is for asm/disasm/sim.
+    // visitor->VisitExternalReference(target_reference_address(), this);
+#ifdef ENABLE_DEBUGGER_SUPPORT
+  // TODO(isolates): Get a cached isolate below.
+  } else if (((RelocInfo::IsJSReturn(mode) &&
+               IsPatchedReturnSequence()) ||
+             (RelocInfo::IsDebugBreakSlot(mode) &&
+               IsPatchedDebugBreakSlotSequence())) &&
+             Isolate::Current()->debug()->has_break_points()) {
+    visitor->VisitDebugTarget(this);
 #endif
-  return ((Assembler::instr_at(pc_) & kOpcodeMask) == SPECIAL) &&
-         (((Assembler::instr_at(pc_) & kFunctionFieldMask) == JAL) ||
-          ((Assembler::instr_at(pc_) & kFunctionFieldMask) == JALR));
+  } else if (mode == RelocInfo::RUNTIME_ENTRY) {
+    visitor->VisitRuntimeEntry(this);
+  }
+}
+
+
+template<typename StaticVisitor>
+void RelocInfo::Visit(Heap* heap) {
+  RelocInfo::Mode mode = rmode();
+  if (mode == RelocInfo::EMBEDDED_OBJECT) {
+    StaticVisitor::VisitPointer(heap, target_object_address());
+  } else if (RelocInfo::IsCodeTarget(mode)) {
+    StaticVisitor::VisitCodeTarget(this);
+  } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
+    StaticVisitor::VisitExternalReference(target_reference_address());
+#ifdef ENABLE_DEBUGGER_SUPPORT
+  } else if (heap->isolate()->debug()->has_break_points() &&
+             ((RelocInfo::IsJSReturn(mode) &&
+              IsPatchedReturnSequence()) ||
+             (RelocInfo::IsDebugBreakSlot(mode) &&
+              IsPatchedDebugBreakSlotSequence()))) {
+    StaticVisitor::VisitDebugTarget(this);
+#endif
+  } else if (mode == RelocInfo::RUNTIME_ENTRY) {
+    StaticVisitor::VisitRuntimeEntry(this);
+  }
 }
 
 
@@ -203,10 +315,18 @@ void Assembler::CheckBuffer() {
 }
 
 
+void Assembler::CheckTrampolinePoolQuick() {
+  if (pc_offset() >= next_buffer_check_) {
+    CheckTrampolinePool();
+  }
+}
+
+
 void Assembler::emit(Instr x) {
   CheckBuffer();
   *reinterpret_cast<Instr*>(pc_) = x;
   pc_ += kInstrSize;
+  CheckTrampolinePoolQuick();
 }
 
 

src/mips/builtins-mips.cc

@@ -33,6 +33,8 @@
 
 #include "codegen-inl.h"
 #include "debug.h"
+#include "deoptimizer.h"
+#include "full-codegen.h"
 #include "runtime.h"
 
 namespace v8 {
@@ -59,126 +61,68 @@ void Builtins::Generate_ArrayConstructCode(MacroAssembler* masm) {
 }
 
 
+void Builtins::Generate_StringConstructCode(MacroAssembler* masm) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
 void Builtins::Generate_JSConstructCall(MacroAssembler* masm) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
+void Builtins::Generate_JSConstructStubCountdown(MacroAssembler* masm) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-void Builtins::Generate_JSConstructStubApi(MacroAssembler* masm) {
+void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
   UNIMPLEMENTED_MIPS();
 }
 
 
-static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
-                                             bool is_construct) {
-  // Called from JSEntryStub::GenerateBody
-
-  // Registers:
-  // a0: entry_address
-  // a1: function
-  // a2: reveiver_pointer
-  // a3: argc
-  // s0: argv
-  //
-  // Stack:
-  // arguments slots
-  // handler frame
-  // entry frame
-  // callee saved registers + ra
-  // 4 args slots
-  // args
-
-  // Clear the context before we push it when entering the JS frame.
-  __ li(cp, Operand(0, RelocInfo::NONE));
-
-  // Enter an internal frame.
-  __ EnterInternalFrame();
-
-  // Set up the context from the function argument.
-  __ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
-
-  // Set up the roots register.
-  ExternalReference roots_address = ExternalReference::roots_address();
-  __ li(s6, Operand(roots_address));
-
-  // Push the function and the receiver onto the stack.
-  __ MultiPushReversed(a1.bit() | a2.bit());
-
-  // Copy arguments to the stack in a loop.
-  // a3: argc
-  // s0: argv, ie points to first arg
-  Label loop, entry;
-  __ sll(t0, a3, kPointerSizeLog2);
-  __ add(t2, s0, t0);
-  __ b(&entry);
-  __ nop();   // Branch delay slot nop.
-  // t2 points past last arg.
-  __ bind(&loop);
-  __ lw(t0, MemOperand(s0));  // Read next parameter.
-  __ addiu(s0, s0, kPointerSize);
-  __ lw(t0, MemOperand(t0));  // Dereference handle.
-  __ Push(t0);  // Push parameter.
-  __ bind(&entry);
-  __ Branch(ne, &loop, s0, Operand(t2));
-
-  // Registers:
-  // a0: entry_address
-  // a1: function
-  // a2: reveiver_pointer
-  // a3: argc
-  // s0: argv
-  // s6: roots_address
-  //
-  // Stack:
-  // arguments
-  // receiver
-  // function
-  // arguments slots
-  // handler frame
-  // entry frame
-  // callee saved registers + ra
-  // 4 args slots
-  // args
-
-  // Initialize all JavaScript callee-saved registers, since they will be seen
-  // by the garbage collector as part of handlers.
-  __ LoadRoot(t4, Heap::kUndefinedValueRootIndex);
-  __ mov(s1, t4);
-  __ mov(s2, t4);
-  __ mov(s3, t4);
-  __ mov(s4, s4);
-  __ mov(s5, t4);
-  // s6 holds the root address. Do not clobber.
-  // s7 is cp. Do not init.
-
-  // Invoke the code and pass argc as a0.
-  __ mov(a0, a3);
-  if (is_construct) {
-    UNIMPLEMENTED_MIPS();
-    __ break_(0x164);
-  } else {
-    ParameterCount actual(a0);
-    __ InvokeFunction(a1, actual, CALL_FUNCTION);
-  }
-
-  __ LeaveInternalFrame();
-
-  __ Jump(ra);
+void Builtins::Generate_JSConstructStubApi(MacroAssembler* masm) {
+  UNIMPLEMENTED_MIPS();
 }
 
 
 void Builtins::Generate_JSEntryTrampoline(MacroAssembler* masm) {
-  Generate_JSEntryTrampolineHelper(masm, false);
+  UNIMPLEMENTED_MIPS();
 }
 
 
 void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
-  Generate_JSEntryTrampolineHelper(masm, true);
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void Builtins::Generate_LazyCompile(MacroAssembler* masm) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void Builtins::Generate_LazyRecompile(MacroAssembler* masm) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void Builtins::Generate_NotifyDeoptimized(MacroAssembler* masm) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void Builtins::Generate_NotifyLazyDeoptimized(MacroAssembler* masm) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void Builtins::Generate_NotifyOSR(MacroAssembler* masm) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) {
+  UNIMPLEMENTED_MIPS();
 }
 
 
@@ -194,7 +138,6 @@ void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
 
 void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {
   UNIMPLEMENTED_MIPS();
-  __ break_(0x201);
 }
 
 

src/mips/register-allocator-mips-inl.h

@@ -125,9 +125,6 @@ Register RegisterAllocator::ToRegister(int num) {
 
 void RegisterAllocator::Initialize() {
   Reset();
-  // The non-reserved a1 and ra registers are live on JS function entry.
-  Use(a1);  // JS function.
-  Use(ra);  // Return address.
 }
 
 

src/regexp-macro-assembler.h

@@ -48,6 +48,7 @@ class RegExpMacroAssembler {
   enum IrregexpImplementation {
     kIA32Implementation,
     kARMImplementation,
+    kMIPSImplementation,
     kX64Implementation,
     kBytecodeImplementation
   };