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129 lines
4.1 KiB
129 lines
4.1 KiB
// AsmJit - Machine code generation for C++
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//
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// * Official AsmJit Home Page: https://asmjit.com
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// * Official Github Repository: https://github.com/asmjit/asmjit
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//
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// Copyright (c) 2008-2020 The AsmJit Authors
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
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// in a product, an acknowledgment in the product documentation would be
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// appreciated but is not required.
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// 2. Altered source versions must be plainly marked as such, and must not be
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// misrepresented as being the original software.
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// 3. This notice may not be removed or altered from any source distribution.
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#include "../core/api-build_p.h"
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#ifndef ASMJIT_NO_JIT
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#include "../core/cpuinfo.h"
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#include "../core/jitruntime.h"
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ASMJIT_BEGIN_NAMESPACE
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// ============================================================================
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// [asmjit::JitRuntime - Utilities]
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// ============================================================================
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// Only useful on non-x86 architectures.
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static inline void JitRuntime_flushInstructionCache(const void* p, size_t size) noexcept {
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#if ASMJIT_ARCH_X86
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DebugUtils::unused(p, size);
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#else
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# if defined(_WIN32)
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// Windows has a built-in support in `kernel32.dll`.
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::FlushInstructionCache(::GetCurrentProcess(), p, size);
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# elif defined(__GNUC__)
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char* start = static_cast<char*>(const_cast<void*>(p));
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char* end = start + size;
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__builtin___clear_cache(start, end);
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# else
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DebugUtils::unused(p, size);
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# endif
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#endif
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}
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// ============================================================================
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// [asmjit::JitRuntime - Construction / Destruction]
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// ============================================================================
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JitRuntime::JitRuntime(const JitAllocator::CreateParams* params) noexcept
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: _allocator(params) {
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_environment = hostEnvironment();
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_environment.setFormat(Environment::kFormatJIT);
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}
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JitRuntime::~JitRuntime() noexcept {}
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// ============================================================================
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// [asmjit::JitRuntime - Interface]
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// ============================================================================
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Error JitRuntime::_add(void** dst, CodeHolder* code) noexcept {
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*dst = nullptr;
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ASMJIT_PROPAGATE(code->flatten());
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ASMJIT_PROPAGATE(code->resolveUnresolvedLinks());
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size_t estimatedCodeSize = code->codeSize();
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if (ASMJIT_UNLIKELY(estimatedCodeSize == 0))
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return DebugUtils::errored(kErrorNoCodeGenerated);
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uint8_t* ro;
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uint8_t* rw;
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ASMJIT_PROPAGATE(_allocator.alloc((void**)&ro, (void**)&rw, estimatedCodeSize));
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// Relocate the code.
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Error err = code->relocateToBase(uintptr_t((void*)ro));
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if (ASMJIT_UNLIKELY(err)) {
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_allocator.release(ro);
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return err;
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}
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// Recalculate the final code size and shrink the memory we allocated for it
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// in case that some relocations didn't require records in an address table.
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size_t codeSize = code->codeSize();
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for (Section* section : code->_sections) {
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size_t offset = size_t(section->offset());
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size_t bufferSize = size_t(section->bufferSize());
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size_t virtualSize = size_t(section->virtualSize());
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ASMJIT_ASSERT(offset + bufferSize <= codeSize);
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memcpy(rw + offset, section->data(), bufferSize);
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if (virtualSize > bufferSize) {
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ASMJIT_ASSERT(offset + virtualSize <= codeSize);
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memset(rw + offset + bufferSize, 0, virtualSize - bufferSize);
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}
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}
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if (codeSize < estimatedCodeSize)
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_allocator.shrink(ro, codeSize);
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flush(ro, codeSize);
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*dst = ro;
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return kErrorOk;
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}
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Error JitRuntime::_release(void* p) noexcept {
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return _allocator.release(p);
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}
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void JitRuntime::flush(const void* p, size_t size) noexcept {
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JitRuntime_flushInstructionCache(p, size);
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}
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ASMJIT_END_NAMESPACE
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#endif
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