The Tor Browser: js/src/jit/x86/Assembler-x86.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-

     2  * vim: set ts=8 sts=4 et sw=4 tw=99:

     3  * This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #include "jit/x86/Assembler-x86.h"

     9 #include "gc/Marking.h"

    11 using namespace js;

    12 using namespace js::jit;

    14 ABIArgGenerator::ABIArgGenerator()

    15   : stackOffset_(0),

    16     current_()

    17 {}

    19 ABIArg

    20 ABIArgGenerator::next(MIRType type)

    21 {

    22     current_ = ABIArg(stackOffset_);

    23     switch (type) {

    24       case MIRType_Int32:

    25       case MIRType_Pointer:

    26         stackOffset_ += sizeof(uint32_t);

    27         break;

    28       case MIRType_Float32: // Float32 moves are actually double moves

    29       case MIRType_Double:

    30         stackOffset_ += sizeof(uint64_t);

    31         break;

    32       default:

    33         MOZ_ASSUME_UNREACHABLE("Unexpected argument type");

    34     }

    35     return current_;

    36 }

    38 const Register ABIArgGenerator::NonArgReturnVolatileReg0 = ecx;

    39 const Register ABIArgGenerator::NonArgReturnVolatileReg1 = edx;

    40 const Register ABIArgGenerator::NonVolatileReg = ebx;

    42 void

    43 Assembler::executableCopy(uint8_t *buffer)

    44 {

    45     AssemblerX86Shared::executableCopy(buffer);

    47     for (size_t i = 0; i < jumps_.length(); i++) {

    48         RelativePatch &rp = jumps_[i];

    49         JSC::X86Assembler::setRel32(buffer + rp.offset, rp.target);

    50     }

    51 }

    53 class RelocationIterator

    54 {

    55     CompactBufferReader reader_;

    56     uint32_t offset_;

    58   public:

    59     RelocationIterator(CompactBufferReader &reader)

    60       : reader_(reader)

    61     { }

    63     bool read() {

    64         if (!reader_.more())

    65             return false;

    66         offset_ = reader_.readUnsigned();

    67         return true;

    68     }

    70     uint32_t offset() const {

    71         return offset_;

    72     }

    73 };

    75 static inline JitCode *

    76 CodeFromJump(uint8_t *jump)

    77 {

    78     uint8_t *target = (uint8_t *)JSC::X86Assembler::getRel32Target(jump);

    79     return JitCode::FromExecutable(target);

    80 }

    82 void

    83 Assembler::TraceJumpRelocations(JSTracer *trc, JitCode *code, CompactBufferReader &reader)

    84 {

    85     RelocationIterator iter(reader);

    86     while (iter.read()) {

    87         JitCode *child = CodeFromJump(code->raw() + iter.offset());

    88         MarkJitCodeUnbarriered(trc, &child, "rel32");

    89         JS_ASSERT(child == CodeFromJump(code->raw() + iter.offset()));

    90     }

    91 }

The Tor Browser / file revision