1 files changed, 85 insertions, 0 deletions
diff --git a/js/src/jit/x86/Assembler-x86.cpp b/js/src/jit/x86/Assembler-x86.cpp
new file mode 100644
index 0000000000..7296f77291
--- /dev/null
+++ b/js/src/jit/x86/Assembler-x86.cpp
@@ -0,0 +1,85 @@
+/* -*- 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()));
+  }
+}