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      1 // Copyright 2012 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 #ifndef V8_MACRO_ASSEMBLER_H_
     29 #define V8_MACRO_ASSEMBLER_H_
     30 
     31 
     32 // Helper types to make boolean flag easier to read at call-site.
     33 enum InvokeFlag {
     34   CALL_FUNCTION,
     35   JUMP_FUNCTION
     36 };
     37 
     38 
     39 // Flags used for the AllocateInNewSpace functions.
     40 enum AllocationFlags {
     41   // No special flags.
     42   NO_ALLOCATION_FLAGS = 0,
     43   // Return the pointer to the allocated already tagged as a heap object.
     44   TAG_OBJECT = 1 << 0,
     45   // The content of the result register already contains the allocation top in
     46   // new space.
     47   RESULT_CONTAINS_TOP = 1 << 1,
     48   // Specify that the requested size of the space to allocate is specified in
     49   // words instead of bytes.
     50   SIZE_IN_WORDS = 1 << 2,
     51   // Align the allocation to a multiple of kDoubleSize
     52   DOUBLE_ALIGNMENT = 1 << 3,
     53   // Directly allocate in old pointer space
     54   PRETENURE_OLD_POINTER_SPACE = 1 << 4,
     55   // Directly allocate in old data space
     56   PRETENURE_OLD_DATA_SPACE = 1 << 5
     57 };
     58 
     59 
     60 // Invalid depth in prototype chain.
     61 const int kInvalidProtoDepth = -1;
     62 
     63 #if V8_TARGET_ARCH_IA32
     64 #include "assembler.h"
     65 #include "ia32/assembler-ia32.h"
     66 #include "ia32/assembler-ia32-inl.h"
     67 #include "code.h"  // must be after assembler_*.h
     68 #include "ia32/macro-assembler-ia32.h"
     69 #elif V8_TARGET_ARCH_X64
     70 #include "assembler.h"
     71 #include "x64/assembler-x64.h"
     72 #include "x64/assembler-x64-inl.h"
     73 #include "code.h"  // must be after assembler_*.h
     74 #include "x64/macro-assembler-x64.h"
     75 #elif V8_TARGET_ARCH_ARM
     76 #include "arm/constants-arm.h"
     77 #include "assembler.h"
     78 #include "arm/assembler-arm.h"
     79 #include "arm/assembler-arm-inl.h"
     80 #include "code.h"  // must be after assembler_*.h
     81 #include "arm/macro-assembler-arm.h"
     82 #elif V8_TARGET_ARCH_MIPS
     83 #include "mips/constants-mips.h"
     84 #include "assembler.h"
     85 #include "mips/assembler-mips.h"
     86 #include "mips/assembler-mips-inl.h"
     87 #include "code.h"  // must be after assembler_*.h
     88 #include "mips/macro-assembler-mips.h"
     89 #else
     90 #error Unsupported target architecture.
     91 #endif
     92 
     93 namespace v8 {
     94 namespace internal {
     95 
     96 class FrameScope {
     97  public:
     98   explicit FrameScope(MacroAssembler* masm, StackFrame::Type type)
     99       : masm_(masm), type_(type), old_has_frame_(masm->has_frame()) {
    100     masm->set_has_frame(true);
    101     if (type != StackFrame::MANUAL && type_ != StackFrame::NONE) {
    102       masm->EnterFrame(type);
    103     }
    104   }
    105 
    106   ~FrameScope() {
    107     if (type_ != StackFrame::MANUAL && type_ != StackFrame::NONE) {
    108       masm_->LeaveFrame(type_);
    109     }
    110     masm_->set_has_frame(old_has_frame_);
    111   }
    112 
    113   // Normally we generate the leave-frame code when this object goes
    114   // out of scope.  Sometimes we may need to generate the code somewhere else
    115   // in addition.  Calling this will achieve that, but the object stays in
    116   // scope, the MacroAssembler is still marked as being in a frame scope, and
    117   // the code will be generated again when it goes out of scope.
    118   void GenerateLeaveFrame() {
    119     masm_->LeaveFrame(type_);
    120   }
    121 
    122  private:
    123   MacroAssembler* masm_;
    124   StackFrame::Type type_;
    125   bool old_has_frame_;
    126 };
    127 
    128 
    129 class AllowExternalCallThatCantCauseGC: public FrameScope {
    130  public:
    131   explicit AllowExternalCallThatCantCauseGC(MacroAssembler* masm)
    132       : FrameScope(masm, StackFrame::NONE) { }
    133 };
    134 
    135 
    136 class NoCurrentFrameScope {
    137  public:
    138   explicit NoCurrentFrameScope(MacroAssembler* masm)
    139       : masm_(masm), saved_(masm->has_frame()) {
    140     masm->set_has_frame(false);
    141   }
    142 
    143   ~NoCurrentFrameScope() {
    144     masm_->set_has_frame(saved_);
    145   }
    146 
    147  private:
    148   MacroAssembler* masm_;
    149   bool saved_;
    150 };
    151 
    152 
    153 // Support for "structured" code comments.
    154 #ifdef DEBUG
    155 
    156 class Comment {
    157  public:
    158   Comment(MacroAssembler* masm, const char* msg);
    159   ~Comment();
    160 
    161  private:
    162   MacroAssembler* masm_;
    163   const char* msg_;
    164 };
    165 
    166 #else
    167 
    168 class Comment {
    169  public:
    170   Comment(MacroAssembler*, const char*)  {}
    171 };
    172 
    173 #endif  // DEBUG
    174 
    175 
    176 class AllocationUtils {
    177  public:
    178   static ExternalReference GetAllocationTopReference(
    179       Isolate* isolate, AllocationFlags flags) {
    180     if ((flags & PRETENURE_OLD_POINTER_SPACE) != 0) {
    181       return ExternalReference::old_pointer_space_allocation_top_address(
    182           isolate);
    183     } else if ((flags & PRETENURE_OLD_DATA_SPACE) != 0) {
    184       return ExternalReference::old_data_space_allocation_top_address(isolate);
    185     }
    186     return ExternalReference::new_space_allocation_top_address(isolate);
    187   }
    188 
    189 
    190   static ExternalReference GetAllocationLimitReference(
    191       Isolate* isolate, AllocationFlags flags) {
    192     if ((flags & PRETENURE_OLD_POINTER_SPACE) != 0) {
    193       return ExternalReference::old_pointer_space_allocation_limit_address(
    194           isolate);
    195     } else if ((flags & PRETENURE_OLD_DATA_SPACE) != 0) {
    196       return ExternalReference::old_data_space_allocation_limit_address(
    197           isolate);
    198     }
    199     return ExternalReference::new_space_allocation_limit_address(isolate);
    200   }
    201 };
    202 
    203 
    204 } }  // namespace v8::internal
    205 
    206 #endif  // V8_MACRO_ASSEMBLER_H_
    207