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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* 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"
#include "util/Memory.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:
case MIRType::RefOrNull:
case MIRType::StackResults:
current_ = ABIArg(stackOffset_);
stackOffset_ += sizeof(uint32_t);
break;
case MIRType::Double:
case MIRType::Int64:
current_ = ABIArg(stackOffset_);
stackOffset_ += sizeof(uint64_t);
break;
case MIRType::Simd128:
// On Win64, >64 bit args need to be passed by reference. However, wasm
// doesn't allow passing SIMD values to JS, so the only way to reach this
// is wasm to wasm calls. Ergo we can break the native ABI here and use
// the Wasm ABI instead.
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 (RelativePatch& rp : jumps_) {
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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