Package com.kenai.jffi

Examples of com.kenai.jffi.PageManager

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        for (Stub stub : stubs) {
            // add 8 bytes for alignment
            codeSize += stub.assembler.codeSize() + 8;
        }

        PageManager pm = PageManager.getInstance();

        long npages = (codeSize + pm.pageSize() - 1) / pm.pageSize();
        // Allocate some native memory for it
        long code = pm.allocatePages((int) npages, PageManager.PROT_READ | PageManager.PROT_WRITE);
        if (code == 0) {
            throw new OutOfMemoryError("allocatePages failed for codeSize=" + codeSize);
        }
        PageHolder page = new PageHolder(pm, code, npages);

        // Now relocate/copy all the assembler stubs into the real code area
        List<NativeMethod> methods = new ArrayList<NativeMethod>(stubs.size());
        long fn = code;
        PrintStream dbg = System.err;
        System.out.flush(); System.err.flush();

        for (Stub stub : stubs) {
            Assembler asm = stub.assembler;
            // align the start of all functions on a 8 byte boundary
            fn = align(fn, 8);
            ByteBuffer buf = ByteBuffer.allocate(asm.codeSize()).order(ByteOrder.LITTLE_ENDIAN);
            stub.assembler.relocCode(buf, fn);
            buf.flip();
            MemoryIO.getInstance().putByteArray(fn, buf.array(), buf.arrayOffset(), buf.limit());

            if (DEBUG && X86Disassembler.isAvailable()) {

                dbg.println(clazz.getName() + "." + stub.name + " " + stub.signature);
                X86Disassembler disassembler = X86Disassembler.create();
                disassembler.setMode(Platform.getNativePlatform().getCPU() == Platform.CPU.I386
                        ? X86Disassembler.Mode.I386 : X86Disassembler.Mode.X86_64);
                disassembler.setSyntax(X86Disassembler.Syntax.INTEL);
                disassembler.setInputBuffer(MemoryUtil.newPointer(fn), asm.offset());
                while (disassembler.disassemble()) {
                    dbg.printf("%8x: %s\n", disassembler.offset(), disassembler.insn());
                }
                if (buf.remaining() > asm.offset()) {
                    // libudis86 for some reason cannot understand the code asmjit emits for the trampolines
                    dbg.printf("%8x: <indirect call trampolines>\n", asm.offset());
                }
                dbg.println();
            }
            methods.add(new NativeMethod(fn, stub.name, stub.signature));

            fn += asm.codeSize();
        }

        pm.protectPages(code, (int) npages, PageManager.PROT_READ | PageManager.PROT_EXEC);

        NativeMethods.register(clazz, methods);
        StaticDataHolder.PAGES.put(clazz, page);
    }
View Full Code Here
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        Magazine magazine = currentMagazine.get();
        Sentinel sentinel = magazine != null ? magazine.get() : null;
        long address;

        if (sentinel == null || (address = magazine.allocate(size, align)) == 0) {
            PageManager pm = PageManager.getInstance();
            long memory;
            do {
                memory = pm.allocatePages(PAGES_PER_MAGAZINE, PageManager.PROT_READ | PageManager.PROT_WRITE);
                if (memory != 0L && memory != -1L) {
                    break;
                }

                // No available pages; trigger a full GC to reclaim some memory
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        Magazine magazine = magazineReference != null ? magazineReference.get() : null;
        Object sentinel = magazine != null ? magazine.get() : null;
        long address;

        if (sentinel == null || (address = magazine.allocate(size, align)) == 0) {
            PageManager pm = PageManager.getInstance();
            long memory;
            int pageCount = PAGES_PER_MAGAZINE;
            do {
                memory = pm.allocatePages(pageCount, PageManager.PROT_READ | PageManager.PROT_WRITE);
                if (memory != 0L && memory != -1L) {
                    break;
                }

                // No available pages; trigger a full GC to reclaim some memory
View Full Code Here
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        Magazine magazine = magazineReference != null ? magazineReference.get() : null;
        Object sentinel = magazine != null ? magazine.sentinel() : null;
        long address;

        if (sentinel == null || (address = magazine.allocate(size, align)) == 0) {
            PageManager pm = PageManager.getInstance();
            long memory;
            int pageCount = PAGES_PER_MAGAZINE;
            do {
                memory = pm.allocatePages(pageCount, PageManager.PROT_READ | PageManager.PROT_WRITE);
                if (memory != 0L && memory != -1L) {
                    break;
                }

                // No available pages; trigger a full GC to reclaim some memory
View Full Code Here
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        Magazine magazine = currentMagazine.get();
        Sentinel sentinel = magazine != null ? magazine.sentinel() : null;
        long address;

        if (sentinel == null || (address = magazine.allocate(size, align)) == 0) {
            PageManager pm = PageManager.getInstance();
            long memory;
            do {
                memory = pm.allocatePages(PAGES_PER_MAGAZINE, PageManager.PROT_READ | PageManager.PROT_WRITE);
                if (memory != 0L && memory != -1L) {
                    break;
                }

                // No available pages; trigger a full GC to reclaim some memory
View Full Code Here
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        for (Stub stub : stubs) {
            // add 8 bytes for alignment
            codeSize += stub.assembler.codeSize() + 8;
        }

        PageManager pm = PageManager.getInstance();

        long npages = (codeSize + pm.pageSize() - 1) / pm.pageSize();
        // Allocate some native memory for it
        long code = pm.allocatePages((int) npages, PageManager.PROT_READ | PageManager.PROT_WRITE);
        if (code == 0) {
            throw new OutOfMemoryError("allocatePages failed for codeSize=" + codeSize);
        }
        PageHolder page = new PageHolder(pm, code, npages);

        // Now relocate/copy all the assembler stubs into the real code area
        List<NativeMethod> methods = new ArrayList<NativeMethod>(stubs.size());
        long fn = code;
        PrintStream dbg = System.err;
        System.out.flush(); System.err.flush();

        for (Stub stub : stubs) {
            Assembler asm = stub.assembler;
            // align the start of all functions on a 8 byte boundary
            fn = align(fn, 8);
            ByteBuffer buf = ByteBuffer.allocate(asm.codeSize()).order(ByteOrder.LITTLE_ENDIAN);
            stub.assembler.relocCode(buf, fn);
            buf.flip();
            MemoryIO.getInstance().putByteArray(fn, buf.array(), buf.arrayOffset(), buf.limit());

            if (DEBUG && X86Disassembler.isAvailable()) {

                dbg.println(clazz.getName() + "." + stub.name + " " + stub.signature);
                X86Disassembler disassembler = X86Disassembler.create();
                disassembler.setMode(Platform.getNativePlatform().getCPU() == Platform.CPU.I386
                        ? X86Disassembler.Mode.I386 : X86Disassembler.Mode.X86_64);
                disassembler.setSyntax(X86Disassembler.Syntax.INTEL);
                disassembler.setInputBuffer(MemoryUtil.newPointer(runtime, fn), asm.offset());
                while (disassembler.disassemble()) {
                    dbg.printf("%8x: %s\n", disassembler.offset(), disassembler.insn());
                }
                if (buf.remaining() > asm.offset()) {
                    // libudis86 for some reason cannot understand the code asmjit emits for the trampolines
                    dbg.printf("%8x: <indirect call trampolines>\n", asm.offset());
                }
                dbg.println();
            }
            methods.add(new NativeMethod(fn, stub.name, stub.signature));

            fn += asm.codeSize();
        }

        pm.protectPages(code, (int) npages, PageManager.PROT_READ | PageManager.PROT_EXEC);

        NativeMethods.register(clazz, methods);
        StaticDataHolder.PAGES.put(clazz, page);
    }
View Full Code Here
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Related Classes of com.kenai.jffi.PageManager

  • jnr.ffi.provider.jffi.AbstractX86StubCompiler
  • jnr.ffi.provider.jffi.TransientNativeMemory
  • org.jruby.ext.ffi.jffi.TransientNativeMemoryIO
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