整理初版

third_party/asmjit/core/jitruntime.cpp

@@ -0,0 +1,80 @@
+// This file is part of AsmJit project <https://asmjit.com>
+//
+// See asmjit.h or LICENSE.md for license and copyright information
+// SPDX-License-Identifier: Zlib
+
+#include "../core/api-build_p.h"
+#ifndef ASMJIT_NO_JIT
+
+#include "../core/cpuinfo.h"
+#include "../core/jitruntime.h"
+
+ASMJIT_BEGIN_NAMESPACE
+
+JitRuntime::JitRuntime(const JitAllocator::CreateParams* params) noexcept
+  : _allocator(params) {
+  _environment = Environment::host();
+  _environment.setObjectFormat(ObjectFormat::kJIT);
+}
+
+JitRuntime::~JitRuntime() noexcept {}
+
+Error JitRuntime::_add(void** dst, CodeHolder* code) noexcept {
+  *dst = nullptr;
+
+  ASMJIT_PROPAGATE(code->flatten());
+  ASMJIT_PROPAGATE(code->resolveUnresolvedLinks());
+
+  size_t estimatedCodeSize = code->codeSize();
+  if (ASMJIT_UNLIKELY(estimatedCodeSize == 0))
+    return DebugUtils::errored(kErrorNoCodeGenerated);
+
+  uint8_t* rx;
+  uint8_t* rw;
+  ASMJIT_PROPAGATE(_allocator.alloc((void**)&rx, (void**)&rw, estimatedCodeSize));
+
+  // Relocate the code.
+  Error err = code->relocateToBase(uintptr_t((void*)rx));
+  if (ASMJIT_UNLIKELY(err)) {
+    _allocator.release(rx);
+    return err;
+  }
+
+  // Recalculate the final code size and shrink the memory we allocated for it
+  // in case that some relocations didn't require records in an address table.
+  size_t codeSize = code->codeSize();
+  if (codeSize < estimatedCodeSize)
+    _allocator.shrink(rx, codeSize);
+
+  if (codeSize < estimatedCodeSize)
+    _allocator.shrink(rx, codeSize);
+
+  {
+    VirtMem::ProtectJitReadWriteScope rwScope(rx, codeSize);
+
+    for (Section* section : code->_sections) {
+      size_t offset = size_t(section->offset());
+      size_t bufferSize = size_t(section->bufferSize());
+      size_t virtualSize = size_t(section->virtualSize());
+
+      ASMJIT_ASSERT(offset + bufferSize <= codeSize);
+      memcpy(rw + offset, section->data(), bufferSize);
+
+      if (virtualSize > bufferSize) {
+        ASMJIT_ASSERT(offset + virtualSize <= codeSize);
+        memset(rw + offset + bufferSize, 0, virtualSize - bufferSize);
+      }
+    }
+  }
+
+  *dst = rx;
+  return kErrorOk;
+}
+
+Error JitRuntime::_release(void* p) noexcept {
+  return _allocator.release(p);
+}
+
+ASMJIT_END_NAMESPACE
+
+#endif