assembler-ia32.h revision f7060e27768c550ace7ec48ad8c093466db52dfa
1a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Copyright (c) 1994-2006 Sun Microsystems Inc. 2a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// All Rights Reserved. 3a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 4a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Redistribution and use in source and binary forms, with or without 5a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// modification, are permitted provided that the following conditions are 6a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// met: 7a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 8a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// - Redistributions of source code must retain the above copyright notice, 9a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// this list of conditions and the following disclaimer. 10a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 11a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// - Redistribution in binary form must reproduce the above copyright 12a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// notice, this list of conditions and the following disclaimer in the 13a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// documentation and/or other materials provided with the distribution. 14a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 15a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// - Neither the name of Sun Microsystems or the names of contributors may 16a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// be used to endorse or promote products derived from this software without 17a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// specific prior written permission. 18a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 19a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 20a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 21a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 23a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 24a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 26a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 27a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 28a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 29a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 31a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// The original source code covered by the above license above has been 32a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// modified significantly by Google Inc. 33a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Copyright 2006-2008 the V8 project authors. All rights reserved. 34a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 35a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// A light-weight IA32 Assembler. 36a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 37a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#ifndef V8_IA32_ASSEMBLER_IA32_H_ 38a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#define V8_IA32_ASSEMBLER_IA32_H_ 39a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 40d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block#include "serialize.h" 41d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block 42a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blocknamespace v8 { 43a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blocknamespace internal { 44a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 45a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// CPU Registers. 46a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 47a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 1) We would prefer to use an enum, but enum values are assignment- 48a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// compatible with int, which has caused code-generation bugs. 49a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 50a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 2) We would prefer to use a class instead of a struct but we don't like 51a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// the register initialization to depend on the particular initialization 52a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// order (which appears to be different on OS X, Linux, and Windows for the 53a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// installed versions of C++ we tried). Using a struct permits C-style 54a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// "initialization". Also, the Register objects cannot be const as this 55a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// forces initialization stubs in MSVC, making us dependent on initialization 56a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// order. 57a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 58a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 3) By not using an enum, we are possibly preventing the compiler from 59a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// doing certain constant folds, which may significantly reduce the 60a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// code generated for some assembly instructions (because they boil down 61a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// to a few constants). If this is a problem, we could change the code 62a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// such that we use an enum in optimized mode, and the struct in debug 63a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// mode. This way we get the compile-time error checking in debug mode 64a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// and best performance in optimized code. 65a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 66a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockstruct Register { 67a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block bool is_valid() const { return 0 <= code_ && code_ < 8; } 68a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block bool is(Register reg) const { return code_ == reg.code_; } 69a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // eax, ebx, ecx and edx are byte registers, the rest are not. 70a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block bool is_byte_register() const { return code_ <= 3; } 71a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int code() const { 72a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ASSERT(is_valid()); 73a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return code_; 74a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 75a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int bit() const { 76a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ASSERT(is_valid()); 77a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return 1 << code_; 78a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 79a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 803100271588b61cbc1dc472a3f2f105d2eed8497fAndrei Popescu // Unfortunately we can't make this private in a struct. 81a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int code_; 82a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block}; 83a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 84a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockconst Register eax = { 0 }; 85a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockconst Register ecx = { 1 }; 86a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockconst Register edx = { 2 }; 87a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockconst Register ebx = { 3 }; 88a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockconst Register esp = { 4 }; 89a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockconst Register ebp = { 5 }; 90a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockconst Register esi = { 6 }; 91a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockconst Register edi = { 7 }; 92a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockconst Register no_reg = { -1 }; 93a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 94a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 95a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockstruct XMMRegister { 966ded16be15dd865a9b21ea304d5273c8be299c87Steve Block bool is_valid() const { return 0 <= code_ && code_ < 8; } 97a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int code() const { 98a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ASSERT(is_valid()); 99a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return code_; 100a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 101a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 102a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int code_; 103a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block}; 104a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 105a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockconst XMMRegister xmm0 = { 0 }; 106a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockconst XMMRegister xmm1 = { 1 }; 107a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockconst XMMRegister xmm2 = { 2 }; 108a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockconst XMMRegister xmm3 = { 3 }; 109a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockconst XMMRegister xmm4 = { 4 }; 110a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockconst XMMRegister xmm5 = { 5 }; 111a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockconst XMMRegister xmm6 = { 6 }; 112a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockconst XMMRegister xmm7 = { 7 }; 113a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 114a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockenum Condition { 115a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // any value < 0 is considered no_condition 116a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block no_condition = -1, 117a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 118a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block overflow = 0, 119a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block no_overflow = 1, 120a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block below = 2, 121a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block above_equal = 3, 122a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block equal = 4, 123a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block not_equal = 5, 124a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block below_equal = 6, 125a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block above = 7, 126a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block negative = 8, 127a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block positive = 9, 128a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block parity_even = 10, 129a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block parity_odd = 11, 130a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block less = 12, 131a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block greater_equal = 13, 132a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block less_equal = 14, 133a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block greater = 15, 134a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 135a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // aliases 136a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block carry = below, 137a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block not_carry = above_equal, 138a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block zero = equal, 139a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block not_zero = not_equal, 140a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block sign = negative, 141a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block not_sign = positive 142a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block}; 143a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 144a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 145a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Returns the equivalent of !cc. 146a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Negation of the default no_condition (-1) results in a non-default 147a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// no_condition value (-2). As long as tests for no_condition check 148a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// for condition < 0, this will work as expected. 149a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockinline Condition NegateCondition(Condition cc); 150a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 151a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Corresponds to transposing the operands of a comparison. 152a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockinline Condition ReverseCondition(Condition cc) { 153a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block switch (cc) { 154a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block case below: 155a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return above; 156a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block case above: 157a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return below; 158a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block case above_equal: 159a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return below_equal; 160a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block case below_equal: 161a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return above_equal; 162a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block case less: 163a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return greater; 164a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block case greater: 165a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return less; 166a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block case greater_equal: 167a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return less_equal; 168a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block case less_equal: 169a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return greater_equal; 170a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block default: 171a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return cc; 172a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block }; 173a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block} 174a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 175a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockenum Hint { 176a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block no_hint = 0, 177a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block not_taken = 0x2e, 178a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block taken = 0x3e 179a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block}; 180a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 181a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// The result of negating a hint is as if the corresponding condition 182a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// were negated by NegateCondition. That is, no_hint is mapped to 183a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// itself and not_taken and taken are mapped to each other. 184a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockinline Hint NegateHint(Hint hint) { 185a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return (hint == no_hint) 186a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ? no_hint 187a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block : ((hint == not_taken) ? taken : not_taken); 188a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block} 189a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 190a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 191a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// ----------------------------------------------------------------------------- 192a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Machine instruction Immediates 193a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 194a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockclass Immediate BASE_EMBEDDED { 195a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block public: 196a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline explicit Immediate(int x); 197a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline explicit Immediate(const ExternalReference& ext); 198a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline explicit Immediate(Handle<Object> handle); 199a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline explicit Immediate(Smi* value); 200a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 201a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static Immediate CodeRelativeOffset(Label* label) { 202a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return Immediate(label); 203a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 204a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 205a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block bool is_zero() const { return x_ == 0 && rmode_ == RelocInfo::NONE; } 206a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block bool is_int8() const { 207a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return -128 <= x_ && x_ < 128 && rmode_ == RelocInfo::NONE; 208a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 209a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block bool is_int16() const { 210a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return -32768 <= x_ && x_ < 32768 && rmode_ == RelocInfo::NONE; 211a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 212a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 213a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block private: 214a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline explicit Immediate(Label* value); 215a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 216a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int x_; 217a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block RelocInfo::Mode rmode_; 218a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 219a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block friend class Assembler; 220a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block}; 221a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 222a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 223a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// ----------------------------------------------------------------------------- 224a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Machine instruction Operands 225a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 226a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockenum ScaleFactor { 227a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block times_1 = 0, 228a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block times_2 = 1, 229a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block times_4 = 2, 230a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block times_8 = 3, 2314515c472dc3e5ed2448a564600976759e569a0a8Leon Clarke times_int_size = times_4, 2324515c472dc3e5ed2448a564600976759e569a0a8Leon Clarke times_half_pointer_size = times_2, 233402d937239b0e2fd11bf2f4fe972ad78aa9fd481Andrei Popescu times_pointer_size = times_4, 234402d937239b0e2fd11bf2f4fe972ad78aa9fd481Andrei Popescu times_twice_pointer_size = times_8 235a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block}; 236a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 237a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 238a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockclass Operand BASE_EMBEDDED { 239a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block public: 240a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // reg 241a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block INLINE(explicit Operand(Register reg)); 242a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 2436ded16be15dd865a9b21ea304d5273c8be299c87Steve Block // XMM reg 2446ded16be15dd865a9b21ea304d5273c8be299c87Steve Block INLINE(explicit Operand(XMMRegister xmm_reg)); 2456ded16be15dd865a9b21ea304d5273c8be299c87Steve Block 246a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // [disp/r] 247a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block INLINE(explicit Operand(int32_t disp, RelocInfo::Mode rmode)); 248a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // disp only must always be relocated 249a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 250a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // [base + disp/r] 251a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block explicit Operand(Register base, int32_t disp, 252a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block RelocInfo::Mode rmode = RelocInfo::NONE); 253a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 254a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // [base + index*scale + disp/r] 255a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block explicit Operand(Register base, 256a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block Register index, 257a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ScaleFactor scale, 258a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int32_t disp, 259a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block RelocInfo::Mode rmode = RelocInfo::NONE); 260a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 261a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // [index*scale + disp/r] 262a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block explicit Operand(Register index, 263a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ScaleFactor scale, 264a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int32_t disp, 265a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block RelocInfo::Mode rmode = RelocInfo::NONE); 266a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 267a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static Operand StaticVariable(const ExternalReference& ext) { 268a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return Operand(reinterpret_cast<int32_t>(ext.address()), 269a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block RelocInfo::EXTERNAL_REFERENCE); 270a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 271a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 272a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static Operand StaticArray(Register index, 273a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ScaleFactor scale, 274a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block const ExternalReference& arr) { 275a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return Operand(index, scale, reinterpret_cast<int32_t>(arr.address()), 276a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block RelocInfo::EXTERNAL_REFERENCE); 277a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 278a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 279a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Returns true if this Operand is a wrapper for the specified register. 280a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block bool is_reg(Register reg) const; 281a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 282a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block private: 283a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block byte buf_[6]; 284a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // The number of bytes in buf_. 285a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block unsigned int len_; 286a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Only valid if len_ > 4. 287a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block RelocInfo::Mode rmode_; 288a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 289a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Set the ModRM byte without an encoded 'reg' register. The 290a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // register is encoded later as part of the emit_operand operation. 291a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline void set_modrm(int mod, Register rm); 292a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 293a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline void set_sib(ScaleFactor scale, Register index, Register base); 294a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline void set_disp8(int8_t disp); 295a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline void set_dispr(int32_t disp, RelocInfo::Mode rmode); 296a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 297a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block friend class Assembler; 298a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block}; 299a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 300a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 301a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// ----------------------------------------------------------------------------- 302a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// A Displacement describes the 32bit immediate field of an instruction which 303a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// may be used together with a Label in order to refer to a yet unknown code 304a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// position. Displacements stored in the instruction stream are used to describe 305a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// the instruction and to chain a list of instructions using the same Label. 306a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// A Displacement contains 2 different fields: 307a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 308a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// next field: position of next displacement in the chain (0 = end of list) 309a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// type field: instruction type 310a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 311a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// A next value of null (0) indicates the end of a chain (note that there can 312a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// be no displacement at position zero, because there is always at least one 313a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// instruction byte before the displacement). 314a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 315a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Displacement _data field layout 316a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 317a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// |31.....2|1......0| 318a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// [ next | type | 319a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 320a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockclass Displacement BASE_EMBEDDED { 321a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block public: 322a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block enum Type { 323a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block UNCONDITIONAL_JUMP, 324a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block CODE_RELATIVE, 325a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block OTHER 326a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block }; 327a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 328a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int data() const { return data_; } 329a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block Type type() const { return TypeField::decode(data_); } 330a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void next(Label* L) const { 331a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int n = NextField::decode(data_); 332a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block n > 0 ? L->link_to(n) : L->Unuse(); 333a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 334a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void link_to(Label* L) { init(L, type()); } 335a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 336a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block explicit Displacement(int data) { data_ = data; } 337a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 338a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block Displacement(Label* L, Type type) { init(L, type); } 339a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 340a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void print() { 341a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block PrintF("%s (%x) ", (type() == UNCONDITIONAL_JUMP ? "jmp" : "[other]"), 342a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block NextField::decode(data_)); 343a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 344a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 345a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block private: 346a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int data_; 347a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 348a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block class TypeField: public BitField<Type, 0, 2> {}; 349a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block class NextField: public BitField<int, 2, 32-2> {}; 350a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 351a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void init(Label* L, Type type); 352a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block}; 353a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 354a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 355a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 356a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// CpuFeatures keeps track of which features are supported by the target CPU. 357a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Supported features must be enabled by a Scope before use. 358a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Example: 359a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// if (CpuFeatures::IsSupported(SSE2)) { 360a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// CpuFeatures::Scope fscope(SSE2); 361a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// // Generate SSE2 floating point code. 362a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// } else { 363a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// // Generate standard x87 floating point code. 364a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// } 365a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockclass CpuFeatures : public AllStatic { 366a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block public: 367a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Detect features of the target CPU. Set safe defaults if the serializer 368a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // is enabled (snapshots must be portable). 369a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static void Probe(); 370a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Check whether a feature is supported by the target CPU. 371d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block static bool IsSupported(CpuFeature f) { 3723ce2e2076e8e3e60cf1810eec160ea2d8557e9e7Steve Block if (f == SSE2 && !FLAG_enable_sse2) return false; 3733ce2e2076e8e3e60cf1810eec160ea2d8557e9e7Steve Block if (f == SSE3 && !FLAG_enable_sse3) return false; 3743ce2e2076e8e3e60cf1810eec160ea2d8557e9e7Steve Block if (f == CMOV && !FLAG_enable_cmov) return false; 3753ce2e2076e8e3e60cf1810eec160ea2d8557e9e7Steve Block if (f == RDTSC && !FLAG_enable_rdtsc) return false; 376a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return (supported_ & (static_cast<uint64_t>(1) << f)) != 0; 377a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 378a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Check whether a feature is currently enabled. 379d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block static bool IsEnabled(CpuFeature f) { 380a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return (enabled_ & (static_cast<uint64_t>(1) << f)) != 0; 381a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 382a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Enable a specified feature within a scope. 383a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block class Scope BASE_EMBEDDED { 384a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#ifdef DEBUG 385a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block public: 386d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block explicit Scope(CpuFeature f) { 387d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block uint64_t mask = static_cast<uint64_t>(1) << f; 388a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ASSERT(CpuFeatures::IsSupported(f)); 389d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block ASSERT(!Serializer::enabled() || (found_by_runtime_probing_ & mask) == 0); 390a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block old_enabled_ = CpuFeatures::enabled_; 391d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block CpuFeatures::enabled_ |= mask; 392a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 393a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ~Scope() { CpuFeatures::enabled_ = old_enabled_; } 394a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block private: 395a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block uint64_t old_enabled_; 396a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#else 397a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block public: 398d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block explicit Scope(CpuFeature f) {} 399a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#endif 400a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block }; 401a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block private: 402a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static uint64_t supported_; 403a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static uint64_t enabled_; 404d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block static uint64_t found_by_runtime_probing_; 405a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block}; 406a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 407a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 408a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockclass Assembler : public Malloced { 409a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block private: 410a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // We check before assembling an instruction that there is sufficient 411a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // space to write an instruction and its relocation information. 412a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // The relocation writer's position must be kGap bytes above the end of 413a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // the generated instructions. This leaves enough space for the 414a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // longest possible ia32 instruction, 15 bytes, and the longest possible 415a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // relocation information encoding, RelocInfoWriter::kMaxLength == 16. 416a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // (There is a 15 byte limit on ia32 instruction length that rules out some 417a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // otherwise valid instructions.) 418a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // This allows for a single, fast space check per instruction. 419a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static const int kGap = 32; 420a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 421a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block public: 422a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Create an assembler. Instructions and relocation information are emitted 423a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // into a buffer, with the instructions starting from the beginning and the 424a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // relocation information starting from the end of the buffer. See CodeDesc 425a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // for a detailed comment on the layout (globals.h). 426a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // 427a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // If the provided buffer is NULL, the assembler allocates and grows its own 428a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // buffer, and buffer_size determines the initial buffer size. The buffer is 429a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // owned by the assembler and deallocated upon destruction of the assembler. 430a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // 431a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // If the provided buffer is not NULL, the assembler uses the provided buffer 432a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // for code generation and assumes its size to be buffer_size. If the buffer 433a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // is too small, a fatal error occurs. No deallocation of the buffer is done 434a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // upon destruction of the assembler. 435a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block Assembler(void* buffer, int buffer_size); 436a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ~Assembler(); 437a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 438a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // GetCode emits any pending (non-emitted) code and fills the descriptor 439a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // desc. GetCode() is idempotent; it returns the same result if no other 440a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Assembler functions are invoked in between GetCode() calls. 441a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void GetCode(CodeDesc* desc); 442a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 443a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Read/Modify the code target in the branch/call instruction at pc. 444a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline static Address target_address_at(Address pc); 445a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline static void set_target_address_at(Address pc, Address target); 446a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 447d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block // This sets the branch destination (which is in the instruction on x86). 448d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block // This is for calls and branches within generated code. 449d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block inline static void set_target_at(Address instruction_payload, 450d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block Address target) { 451d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block set_target_address_at(instruction_payload, target); 452d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block } 453d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block 454d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block // This sets the branch destination (which is in the instruction on x86). 455d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block // This is for calls and branches to runtime code. 456d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block inline static void set_external_target_at(Address instruction_payload, 457d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block Address target) { 458d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block set_target_address_at(instruction_payload, target); 459d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block } 460d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block 461d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block static const int kCallTargetSize = kPointerSize; 462d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block static const int kExternalTargetSize = kPointerSize; 463d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block 464a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Distance between the address of the code target in the call instruction 465a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // and the return address 466a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static const int kCallTargetAddressOffset = kPointerSize; 467a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Distance between start of patched return sequence and the emitted address 468a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // to jump to. 469a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static const int kPatchReturnSequenceAddressOffset = 1; // JMP imm32. 470a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 471d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block static const int kCallInstructionLength = 5; 472d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block static const int kJSReturnSequenceLength = 6; 473a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 474a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // --------------------------------------------------------------------------- 475a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Code generation 476a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // 477a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // - function names correspond one-to-one to ia32 instruction mnemonics 478a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // - unless specified otherwise, instructions operate on 32bit operands 479a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // - instructions on 8bit (byte) operands/registers have a trailing '_b' 480a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // - instructions on 16bit (word) operands/registers have a trailing '_w' 481a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // - naming conflicts with C++ keywords are resolved via a trailing '_' 482a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 483a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // NOTE ON INTERFACE: Currently, the interface is not very consistent 484a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // in the sense that some operations (e.g. mov()) can be called in more 485a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // the one way to generate the same instruction: The Register argument 486a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // can in some cases be replaced with an Operand(Register) argument. 487a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // This should be cleaned up and made more orthogonal. The questions 488a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // is: should we always use Operands instead of Registers where an 489a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Operand is possible, or should we have a Register (overloaded) form 490a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // instead? We must be careful to make sure that the selected instruction 491a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // is obvious from the parameters to avoid hard-to-find code generation 492a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // bugs. 493a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 494a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Insert the smallest number of nop instructions 495a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // possible to align the pc offset to a multiple 496a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // of m. m must be a power of 2. 497a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void Align(int m); 498a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 499a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Stack 500a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void pushad(); 501a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void popad(); 502a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 503a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void pushfd(); 504a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void popfd(); 505a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 506a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void push(const Immediate& x); 507a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void push(Register src); 508a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void push(const Operand& src); 509a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void push(Label* label, RelocInfo::Mode relocation_mode); 510a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 511a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void pop(Register dst); 512a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void pop(const Operand& dst); 513a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 514a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void enter(const Immediate& size); 515a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void leave(); 516a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 517a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Moves 518a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void mov_b(Register dst, const Operand& src); 519a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void mov_b(const Operand& dst, int8_t imm8); 520a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void mov_b(const Operand& dst, Register src); 521a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 522a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void mov_w(Register dst, const Operand& src); 523a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void mov_w(const Operand& dst, Register src); 524a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 525a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void mov(Register dst, int32_t imm32); 526a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void mov(Register dst, const Immediate& x); 527a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void mov(Register dst, Handle<Object> handle); 528a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void mov(Register dst, const Operand& src); 529a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void mov(Register dst, Register src); 530a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void mov(const Operand& dst, const Immediate& x); 531a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void mov(const Operand& dst, Handle<Object> handle); 532a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void mov(const Operand& dst, Register src); 533a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 534a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void movsx_b(Register dst, const Operand& src); 535a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 536a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void movsx_w(Register dst, const Operand& src); 537a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 538a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void movzx_b(Register dst, const Operand& src); 539a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 540a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void movzx_w(Register dst, const Operand& src); 541a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 542a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Conditional moves 543a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void cmov(Condition cc, Register dst, int32_t imm32); 544a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void cmov(Condition cc, Register dst, Handle<Object> handle); 545a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void cmov(Condition cc, Register dst, const Operand& src); 546a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 5476ded16be15dd865a9b21ea304d5273c8be299c87Steve Block // Flag management. 5486ded16be15dd865a9b21ea304d5273c8be299c87Steve Block void cld(); 5496ded16be15dd865a9b21ea304d5273c8be299c87Steve Block 550e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke // Repetitive string instructions. 551e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke void rep_movs(); 5526ded16be15dd865a9b21ea304d5273c8be299c87Steve Block void rep_stos(); 553f7060e27768c550ace7ec48ad8c093466db52dfaLeon Clarke void stos(); 554e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke 555a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Exchange two registers 556a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void xchg(Register dst, Register src); 557a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 558a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Arithmetics 559a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void adc(Register dst, int32_t imm32); 560a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void adc(Register dst, const Operand& src); 561a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 562a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void add(Register dst, const Operand& src); 563a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void add(const Operand& dst, const Immediate& x); 564a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 565a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void and_(Register dst, int32_t imm32); 566a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void and_(Register dst, const Operand& src); 567a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void and_(const Operand& src, Register dst); 568a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void and_(const Operand& dst, const Immediate& x); 569a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 570a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void cmpb(const Operand& op, int8_t imm8); 571d91b9f7d46489a9ee00f9cb415630299c76a502bLeon Clarke void cmpb(Register src, const Operand& dst); 572d91b9f7d46489a9ee00f9cb415630299c76a502bLeon Clarke void cmpb(const Operand& dst, Register src); 573a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void cmpb_al(const Operand& op); 574a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void cmpw_ax(const Operand& op); 575a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void cmpw(const Operand& op, Immediate imm16); 576a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void cmp(Register reg, int32_t imm32); 577a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void cmp(Register reg, Handle<Object> handle); 578a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void cmp(Register reg, const Operand& op); 579a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void cmp(const Operand& op, const Immediate& imm); 580a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void cmp(const Operand& op, Handle<Object> handle); 581a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 582a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void dec_b(Register dst); 583a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 584a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void dec(Register dst); 585a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void dec(const Operand& dst); 586a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 587a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void cdq(); 588a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 589a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void idiv(Register src); 590a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 591a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Signed multiply instructions. 592a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void imul(Register src); // edx:eax = eax * src. 593a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void imul(Register dst, const Operand& src); // dst = dst * src. 594a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void imul(Register dst, Register src, int32_t imm32); // dst = src * imm32. 595a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 596a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void inc(Register dst); 597a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void inc(const Operand& dst); 598a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 599a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void lea(Register dst, const Operand& src); 600a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 601a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Unsigned multiply instruction. 602a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void mul(Register src); // edx:eax = eax * reg. 603a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 604a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void neg(Register dst); 605a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 606a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void not_(Register dst); 607a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 608a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void or_(Register dst, int32_t imm32); 609a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void or_(Register dst, const Operand& src); 610a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void or_(const Operand& dst, Register src); 611a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void or_(const Operand& dst, const Immediate& x); 612a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 613a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void rcl(Register dst, uint8_t imm8); 614a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 615a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void sar(Register dst, uint8_t imm8); 616d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block void sar_cl(Register dst); 617a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 618a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void sbb(Register dst, const Operand& src); 619a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 620a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void shld(Register dst, const Operand& src); 621a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 622a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void shl(Register dst, uint8_t imm8); 623d0582a6c46733687d045e4188a1bcd0123c758a1Steve Block void shl_cl(Register dst); 624a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 625a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void shrd(Register dst, const Operand& src); 626a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 627a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void shr(Register dst, uint8_t imm8); 628a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void shr_cl(Register dst); 629a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 6303ce2e2076e8e3e60cf1810eec160ea2d8557e9e7Steve Block void subb(const Operand& dst, int8_t imm8); 631e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke void subb(Register dst, const Operand& src); 632a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void sub(const Operand& dst, const Immediate& x); 633a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void sub(Register dst, const Operand& src); 634a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void sub(const Operand& dst, Register src); 635a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 636a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void test(Register reg, const Immediate& imm); 637a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void test(Register reg, const Operand& op); 638e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke void test_b(Register reg, const Operand& op); 639a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void test(const Operand& op, const Immediate& imm); 640a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 641a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void xor_(Register dst, int32_t imm32); 642a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void xor_(Register dst, const Operand& src); 643a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void xor_(const Operand& src, Register dst); 644a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void xor_(const Operand& dst, const Immediate& x); 645a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 646a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Bit operations. 647a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void bt(const Operand& dst, Register src); 648a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void bts(const Operand& dst, Register src); 649a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 650a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Miscellaneous 651a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void hlt(); 652a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void int3(); 653a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void nop(); 654a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void rdtsc(); 655a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void ret(int imm16); 656a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 657a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Label operations & relative jumps (PPUM Appendix D) 658a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // 659a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Takes a branch opcode (cc) and a label (L) and generates 660a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // either a backward branch or a forward branch and links it 661a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // to the label fixup chain. Usage: 662a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // 663a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Label L; // unbound label 664a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // j(cc, &L); // forward branch to unbound label 665a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // bind(&L); // bind label to the current pc 666a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // j(cc, &L); // backward branch to bound label 667a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // bind(&L); // illegal: a label may be bound only once 668a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // 669a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Note: The same Label can be used for forward and backward branches 670a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // but it may be bound only once. 671a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 672a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void bind(Label* L); // binds an unbound label L to the current code position 673a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 674a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Calls 675a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void call(Label* L); 676a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void call(byte* entry, RelocInfo::Mode rmode); 677a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void call(const Operand& adr); 678402d937239b0e2fd11bf2f4fe972ad78aa9fd481Andrei Popescu void call(const ExternalReference& target); 679a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void call(Handle<Code> code, RelocInfo::Mode rmode); 680a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 681a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Jumps 682a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void jmp(Label* L); // unconditional jump to L 683a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void jmp(byte* entry, RelocInfo::Mode rmode); 684a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void jmp(const Operand& adr); 685a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void jmp(Handle<Code> code, RelocInfo::Mode rmode); 686a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 687a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Conditional jumps 688a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void j(Condition cc, Label* L, Hint hint = no_hint); 689a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void j(Condition cc, byte* entry, RelocInfo::Mode rmode, Hint hint = no_hint); 690a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void j(Condition cc, Handle<Code> code, Hint hint = no_hint); 691a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 692a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Floating-point operations 693a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fld(int i); 694402d937239b0e2fd11bf2f4fe972ad78aa9fd481Andrei Popescu void fstp(int i); 695a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 696a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fld1(); 697a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fldz(); 698402d937239b0e2fd11bf2f4fe972ad78aa9fd481Andrei Popescu void fldpi(); 699a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 700a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fld_s(const Operand& adr); 701a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fld_d(const Operand& adr); 702a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 703a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fstp_s(const Operand& adr); 704a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fstp_d(const Operand& adr); 705402d937239b0e2fd11bf2f4fe972ad78aa9fd481Andrei Popescu void fst_d(const Operand& adr); 706a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 707a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fild_s(const Operand& adr); 708a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fild_d(const Operand& adr); 709a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 710a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fist_s(const Operand& adr); 711a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 712a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fistp_s(const Operand& adr); 713a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fistp_d(const Operand& adr); 714a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 7156ded16be15dd865a9b21ea304d5273c8be299c87Steve Block // The fisttp instructions require SSE3. 716a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fisttp_s(const Operand& adr); 717e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke void fisttp_d(const Operand& adr); 718a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 719a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fabs(); 720a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fchs(); 721a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fcos(); 722a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fsin(); 723a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 724a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fadd(int i); 725a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fsub(int i); 726a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fmul(int i); 727a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fdiv(int i); 728a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 729a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fisub_s(const Operand& adr); 730a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 731a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void faddp(int i = 1); 732a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fsubp(int i = 1); 733a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fsubrp(int i = 1); 734a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fmulp(int i = 1); 735a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fdivp(int i = 1); 736a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fprem(); 737a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fprem1(); 738a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 739a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fxch(int i = 1); 740a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fincstp(); 741a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void ffree(int i = 0); 742a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 743a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void ftst(); 744a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fucomp(int i); 745a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fucompp(); 7463ce2e2076e8e3e60cf1810eec160ea2d8557e9e7Steve Block void fucomi(int i); 7473ce2e2076e8e3e60cf1810eec160ea2d8557e9e7Steve Block void fucomip(); 748a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fcompp(); 749a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fnstsw_ax(); 750a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fwait(); 751a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void fnclex(); 752a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 753a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void frndint(); 754a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 755a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void sahf(); 756a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void setcc(Condition cc, Register reg); 757a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 758a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void cpuid(); 759a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 760a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // SSE2 instructions 761a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void cvttss2si(Register dst, const Operand& src); 762a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void cvttsd2si(Register dst, const Operand& src); 763a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 764a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void cvtsi2sd(XMMRegister dst, const Operand& src); 7656ded16be15dd865a9b21ea304d5273c8be299c87Steve Block void cvtss2sd(XMMRegister dst, XMMRegister src); 766a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 767a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void addsd(XMMRegister dst, XMMRegister src); 768a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void subsd(XMMRegister dst, XMMRegister src); 769a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void mulsd(XMMRegister dst, XMMRegister src); 770a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void divsd(XMMRegister dst, XMMRegister src); 771e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke void xorpd(XMMRegister dst, XMMRegister src); 7726ded16be15dd865a9b21ea304d5273c8be299c87Steve Block void sqrtsd(XMMRegister dst, XMMRegister src); 773a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 774a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void comisd(XMMRegister dst, XMMRegister src); 7756ded16be15dd865a9b21ea304d5273c8be299c87Steve Block void ucomisd(XMMRegister dst, XMMRegister src); 7766ded16be15dd865a9b21ea304d5273c8be299c87Steve Block void movmskpd(Register dst, XMMRegister src); 777a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 778e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke void movdqa(XMMRegister dst, const Operand& src); 779e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke void movdqa(const Operand& dst, XMMRegister src); 780e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke void movdqu(XMMRegister dst, const Operand& src); 781e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke void movdqu(const Operand& dst, XMMRegister src); 782e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke 783a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Use either movsd or movlpd. 784a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void movdbl(XMMRegister dst, const Operand& src); 785a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void movdbl(const Operand& dst, XMMRegister src); 786a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 7876ded16be15dd865a9b21ea304d5273c8be299c87Steve Block void movd(XMMRegister dst, const Operand& src); 7886ded16be15dd865a9b21ea304d5273c8be299c87Steve Block void movsd(XMMRegister dst, XMMRegister src); 7896ded16be15dd865a9b21ea304d5273c8be299c87Steve Block 7906ded16be15dd865a9b21ea304d5273c8be299c87Steve Block void pxor(XMMRegister dst, XMMRegister src); 7916ded16be15dd865a9b21ea304d5273c8be299c87Steve Block void ptest(XMMRegister dst, XMMRegister src); 7926ded16be15dd865a9b21ea304d5273c8be299c87Steve Block 793a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Debugging 794a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void Print(); 795a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 796a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Check the code size generated from label to here. 797a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int SizeOfCodeGeneratedSince(Label* l) { return pc_offset() - l->pos(); } 798a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 799a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Mark address of the ExitJSFrame code. 800a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void RecordJSReturn(); 801a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 802a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Record a comment relocation entry that can be used by a disassembler. 803a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Use --debug_code to enable. 804a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void RecordComment(const char* msg); 805a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 806a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void RecordPosition(int pos); 807a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void RecordStatementPosition(int pos); 808a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void WriteRecordedPositions(); 809a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 810a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Writes a single word of data in the code stream. 811a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Used for inline tables, e.g., jump-tables. 812a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void dd(uint32_t data, RelocInfo::Mode reloc_info); 813a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 814a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int pc_offset() const { return pc_ - buffer_; } 815a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int current_statement_position() const { return current_statement_position_; } 816a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int current_position() const { return current_position_; } 817a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 818a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Check if there is less than kGap bytes available in the buffer. 819a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // If this is the case, we need to grow the buffer before emitting 820a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // an instruction or relocation information. 821a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline bool overflow() const { return pc_ >= reloc_info_writer.pos() - kGap; } 822a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 823a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Get the number of bytes available in the buffer. 824a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline int available_space() const { return reloc_info_writer.pos() - pc_; } 825a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 826a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Avoid overflows for displacements etc. 827a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static const int kMaximalBufferSize = 512*MB; 828a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static const int kMinimalBufferSize = 4*KB; 829a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 830a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block protected: 831a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void movsd(XMMRegister dst, const Operand& src); 832a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void movsd(const Operand& dst, XMMRegister src); 833a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 834a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void emit_sse_operand(XMMRegister reg, const Operand& adr); 835a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void emit_sse_operand(XMMRegister dst, XMMRegister src); 8366ded16be15dd865a9b21ea304d5273c8be299c87Steve Block void emit_sse_operand(Register dst, XMMRegister src); 837a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 838a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block private: 839a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block byte* addr_at(int pos) { return buffer_ + pos; } 840a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block byte byte_at(int pos) { return buffer_[pos]; } 841a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block uint32_t long_at(int pos) { 842a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return *reinterpret_cast<uint32_t*>(addr_at(pos)); 843a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 844a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void long_at_put(int pos, uint32_t x) { 845a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block *reinterpret_cast<uint32_t*>(addr_at(pos)) = x; 846a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 847a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 848a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // code emission 849a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void GrowBuffer(); 850a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline void emit(uint32_t x); 851a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline void emit(Handle<Object> handle); 852a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline void emit(uint32_t x, RelocInfo::Mode rmode); 853a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline void emit(const Immediate& x); 854a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline void emit_w(const Immediate& x); 855a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 856a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Emit the code-object-relative offset of the label's position 857a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline void emit_code_relative_offset(Label* label); 858a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 859a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // instruction generation 860a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void emit_arith_b(int op1, int op2, Register dst, int imm8); 861a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 862a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Emit a basic arithmetic instruction (i.e. first byte of the family is 0x81) 863a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // with a given destination expression and an immediate operand. It attempts 864a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // to use the shortest encoding possible. 865a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // sel specifies the /n in the modrm byte (see the Intel PRM). 866a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void emit_arith(int sel, Operand dst, const Immediate& x); 867a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 868a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void emit_operand(Register reg, const Operand& adr); 869a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 870a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void emit_farith(int b1, int b2, int i); 871a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 872a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // labels 873a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void print(Label* L); 874a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void bind_to(Label* L, int pos); 875a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void link_to(Label* L, Label* appendix); 876a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 877a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // displacements 878a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline Displacement disp_at(Label* L); 879a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline void disp_at_put(Label* L, Displacement disp); 880a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block inline void emit_disp(Label* L, Displacement::Type type); 881a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 882a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // record reloc info for current pc_ 883a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data = 0); 884a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 885a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block friend class CodePatcher; 886a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block friend class EnsureSpace; 887a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 888a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Code buffer: 889a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // The buffer into which code and relocation info are generated. 890a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block byte* buffer_; 891a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int buffer_size_; 892a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // True if the assembler owns the buffer, false if buffer is external. 893a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block bool own_buffer_; 894a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // A previously allocated buffer of kMinimalBufferSize bytes, or NULL. 895a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static byte* spare_buffer_; 896a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 897a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // code generation 898a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block byte* pc_; // the program counter; moves forward 899a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block RelocInfoWriter reloc_info_writer; 900a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 901a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // push-pop elimination 902a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block byte* last_pc_; 903a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 904a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // source position information 905a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int current_statement_position_; 906a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int current_position_; 907a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int written_statement_position_; 908a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int written_position_; 909a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block}; 910a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 911a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 912a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Helper class that ensures that there is enough space for generating 913a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// instructions and relocation information. The constructor makes 914a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// sure that there is enough space and (in debug mode) the destructor 915a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// checks that we did not generate too much. 916a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockclass EnsureSpace BASE_EMBEDDED { 917a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block public: 918a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block explicit EnsureSpace(Assembler* assembler) : assembler_(assembler) { 919a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block if (assembler_->overflow()) assembler_->GrowBuffer(); 920a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#ifdef DEBUG 921a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block space_before_ = assembler_->available_space(); 922a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#endif 923a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 924a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 925a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#ifdef DEBUG 926a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ~EnsureSpace() { 927a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int bytes_generated = space_before_ - assembler_->available_space(); 928a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ASSERT(bytes_generated < assembler_->kGap); 929a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 930a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#endif 931a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 932a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block private: 933a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block Assembler* assembler_; 934a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#ifdef DEBUG 935a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block int space_before_; 936a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#endif 937a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block}; 938a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 939a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block} } // namespace v8::internal 940a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 941a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#endif // V8_IA32_ASSEMBLER_IA32_H_ 942