Add m-esr52 at 52.6.0

1 files changed, 106 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 000000000..7fca29434
--- /dev/null
+++ b/js/src/jit/x86/Assembler-x86.cpp
@@ -0,0 +1,106 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * 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()));
+    }
+}