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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "jit/x86/Assembler-x86.h"
#include "gc/Marking.h"
using namespace js;
using namespace js::jit;
ABIArgGenerator::ABIArgGenerator()
: stackOffset_(0),
current_()
{}
ABIArg
ABIArgGenerator::next(MIRType type)
{
switch (type) {
case MIRType::Int32:
case MIRType::Float32:
case MIRType::Pointer:
current_ = ABIArg(stackOffset_);
stackOffset_ += sizeof(uint32_t);
break;
case MIRType::Double:
current_ = ABIArg(stackOffset_);
stackOffset_ += sizeof(uint64_t);
break;
case MIRType::Int64:
current_ = ABIArg(stackOffset_);
stackOffset_ += sizeof(uint64_t);
break;
case MIRType::Int8x16:
case MIRType::Int16x8:
case MIRType::Int32x4:
case MIRType::Float32x4:
case MIRType::Bool8x16:
case MIRType::Bool16x8:
case MIRType::Bool32x4:
// SIMD values aren't passed in or out of C++, so we can make up
// whatever internal ABI we like. visitWasmStackArg assumes
// SimdMemoryAlignment.
stackOffset_ = AlignBytes(stackOffset_, SimdMemoryAlignment);
current_ = ABIArg(stackOffset_);
stackOffset_ += Simd128DataSize;
break;
default:
MOZ_CRASH("Unexpected argument type");
}
return current_;
}
void
Assembler::executableCopy(uint8_t* buffer)
{
AssemblerX86Shared::executableCopy(buffer);
for (size_t i = 0; i < jumps_.length(); i++) {
RelativePatch& rp = jumps_[i];
X86Encoding::SetRel32(buffer + rp.offset, rp.target);
}
}
class RelocationIterator
{
CompactBufferReader reader_;
uint32_t offset_;
public:
explicit RelocationIterator(CompactBufferReader& reader)
: reader_(reader)
{ }
bool read() {
if (!reader_.more())
return false;
offset_ = reader_.readUnsigned();
return true;
}
uint32_t offset() const {
return offset_;
}
};
static inline JitCode*
CodeFromJump(uint8_t* jump)
{
uint8_t* target = (uint8_t*)X86Encoding::GetRel32Target(jump);
return JitCode::FromExecutable(target);
}
void
Assembler::TraceJumpRelocations(JSTracer* trc, JitCode* code, CompactBufferReader& reader)
{
RelocationIterator iter(reader);
while (iter.read()) {
JitCode* child = CodeFromJump(code->raw() + iter.offset());
TraceManuallyBarrieredEdge(trc, &child, "rel32");
MOZ_ASSERT(child == CodeFromJump(code->raw() + iter.offset()));
}
}
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