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js/src/jit/shared/Assembler-x86-shared.cpp@6474c204b198 (annotated)

js/src/jit/shared/Assembler-x86-shared.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Wed, 31 Dec 2014 06:09:35 +0100

changeset 0

6474c204b198

permissions

-rw-r--r--

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

michael@0	1	/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0	2	* vim: set ts=8 sts=4 et sw=4 tw=99:
michael@0	3	* This Source Code Form is subject to the terms of the Mozilla Public
michael@0	4	* License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0	5	* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0	6
michael@0	7	#include "gc/Marking.h"
michael@0	8	#include "jit/JitCompartment.h"
michael@0	9	#if defined(JS_CODEGEN_X86)
michael@0	10	# include "jit/x86/MacroAssembler-x86.h"
michael@0	11	#elif defined(JS_CODEGEN_X64)
michael@0	12	# include "jit/x64/MacroAssembler-x64.h"
michael@0	13	#else
michael@0	14	# error "Wrong architecture. Only x86 and x64 should build this file!"
michael@0	15	#endif
michael@0	16
michael@0	17	using namespace js;
michael@0	18	using namespace js::jit;
michael@0	19
michael@0	20	void
michael@0	21	AssemblerX86Shared::copyJumpRelocationTable(uint8_t *dest)
michael@0	22	{
michael@0	23	if (jumpRelocations_.length())
michael@0	24	memcpy(dest, jumpRelocations_.buffer(), jumpRelocations_.length());
michael@0	25	}
michael@0	26
michael@0	27	void
michael@0	28	AssemblerX86Shared::copyDataRelocationTable(uint8_t *dest)
michael@0	29	{
michael@0	30	if (dataRelocations_.length())
michael@0	31	memcpy(dest, dataRelocations_.buffer(), dataRelocations_.length());
michael@0	32	}
michael@0	33
michael@0	34	void
michael@0	35	AssemblerX86Shared::copyPreBarrierTable(uint8_t *dest)
michael@0	36	{
michael@0	37	if (preBarriers_.length())
michael@0	38	memcpy(dest, preBarriers_.buffer(), preBarriers_.length());
michael@0	39	}
michael@0	40
michael@0	41	static void
michael@0	42	TraceDataRelocations(JSTracer *trc, uint8_t *buffer, CompactBufferReader &reader)
michael@0	43	{
michael@0	44	while (reader.more()) {
michael@0	45	size_t offset = reader.readUnsigned();
michael@0	46	void **ptr = JSC::X86Assembler::getPointerRef(buffer + offset);
michael@0	47
michael@0	48	#ifdef JS_PUNBOX64
michael@0	49	// All pointers on x64 will have the top bits cleared. If those bits
michael@0	50	// are not cleared, this must be a Value.
michael@0	51	uintptr_t *word = reinterpret_cast<uintptr_t *>(ptr);
michael@0	52	if (*word >> JSVAL_TAG_SHIFT) {
michael@0	53	jsval_layout layout;
michael@0	54	layout.asBits = *word;
michael@0	55	Value v = IMPL_TO_JSVAL(layout);
michael@0	56	gc::MarkValueUnbarriered(trc, &v, "ion-masm-value");
michael@0	57	JS_ASSERT(*word == JSVAL_TO_IMPL(v).asBits);
michael@0	58	continue;
michael@0	59	}
michael@0	60	#endif
michael@0	61
michael@0	62	// No barrier needed since these are constants.
michael@0	63	gc::MarkGCThingUnbarriered(trc, reinterpret_cast<void **>(ptr), "ion-masm-ptr");
michael@0	64	}
michael@0	65	}
michael@0	66
michael@0	67
michael@0	68	void
michael@0	69	AssemblerX86Shared::TraceDataRelocations(JSTracer *trc, JitCode *code, CompactBufferReader &reader)
michael@0	70	{
michael@0	71	::TraceDataRelocations(trc, code->raw(), reader);
michael@0	72	}
michael@0	73
michael@0	74	void
michael@0	75	AssemblerX86Shared::trace(JSTracer *trc)
michael@0	76	{
michael@0	77	for (size_t i = 0; i < jumps_.length(); i++) {
michael@0	78	RelativePatch &rp = jumps_[i];
michael@0	79	if (rp.kind == Relocation::JITCODE) {
michael@0	80	JitCode *code = JitCode::FromExecutable((uint8_t *)rp.target);
michael@0	81	MarkJitCodeUnbarriered(trc, &code, "masmrel32");
michael@0	82	JS_ASSERT(code == JitCode::FromExecutable((uint8_t *)rp.target));
michael@0	83	}
michael@0	84	}
michael@0	85	if (dataRelocations_.length()) {
michael@0	86	CompactBufferReader reader(dataRelocations_);
michael@0	87	::TraceDataRelocations(trc, masm.buffer(), reader);
michael@0	88	}
michael@0	89	}
michael@0	90
michael@0	91	void
michael@0	92	AssemblerX86Shared::executableCopy(void *buffer)
michael@0	93	{
michael@0	94	masm.executableCopy(buffer);
michael@0	95	}
michael@0	96
michael@0	97	void
michael@0	98	AssemblerX86Shared::processCodeLabels(uint8_t *rawCode)
michael@0	99	{
michael@0	100	for (size_t i = 0; i < codeLabels_.length(); i++) {
michael@0	101	CodeLabel label = codeLabels_[i];
michael@0	102	Bind(rawCode, label.dest(), rawCode + label.src()->offset());
michael@0	103	}
michael@0	104	}
michael@0	105
michael@0	106	AssemblerX86Shared::Condition
michael@0	107	AssemblerX86Shared::InvertCondition(Condition cond)
michael@0	108	{
michael@0	109	switch (cond) {
michael@0	110	case Zero:
michael@0	111	return NonZero;
michael@0	112	case NonZero:
michael@0	113	return Zero;
michael@0	114	case LessThan:
michael@0	115	return GreaterThanOrEqual;
michael@0	116	case LessThanOrEqual:
michael@0	117	return GreaterThan;
michael@0	118	case GreaterThan:
michael@0	119	return LessThanOrEqual;
michael@0	120	case GreaterThanOrEqual:
michael@0	121	return LessThan;
michael@0	122	case Above:
michael@0	123	return BelowOrEqual;
michael@0	124	case AboveOrEqual:
michael@0	125	return Below;
michael@0	126	case Below:
michael@0	127	return AboveOrEqual;
michael@0	128	case BelowOrEqual:
michael@0	129	return Above;
michael@0	130	default:
michael@0	131	MOZ_ASSUME_UNREACHABLE("unexpected condition");
michael@0	132	}
michael@0	133	}