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ffi: add fast support for almost all other platforms · nodejs/node@97aafe2 · GitHub

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ffi: add fast support for almost all other platforms
Signed-off-by: Paolo Insogna <paolo@cowtech.it> PR-URL: #63941 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
1 parent 54948c7 commit 97aafe2

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Lines changed: 1209 additions & 67 deletions

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‎doc/contributing/ffi-fast-api-internals.md‎

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@@ -41,10 +41,9 @@ The implementation is split across these files:
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* `src/ffi/types.{h,cc}` parses public FFI signatures and implements
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`IsFastCallEligible()`, which rejects signatures that the current Fast API
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trampolines cannot represent.
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* `src/ffi/platforms/arm64.cc` and `src/ffi/platforms/x64.cc` contain the
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platform trampoline generators. These files follow the contract exposed by
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`node_ffi_create_fast_trampoline()` and release code with
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`node_ffi_free_fast_trampoline()`.
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* `src/ffi/platforms/*.cc` contain the platform trampoline generators. These
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files follow the contract exposed by `node_ffi_create_fast_trampoline()` and
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release code with `node_ffi_free_fast_trampoline()`.
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* `src/node_ffi.cc` decides whether a function gets a Fast API callable,
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SharedBuffer callable, or generic callable, and attaches hidden metadata used
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by JavaScript wrappers.
@@ -88,8 +87,7 @@ true only on supported architectures when `IsJitMemorySupported()` succeeds.
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`IsJitMemorySupported()` runs a one-time self-test:
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* Map one writable anonymous page.
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* Write a minimal return instruction (`0xD65F03C0` on AArch64, `0xC3` on
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x86\_64).
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* Write a minimal return instruction for the current architecture.
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* Flush the instruction cache where required.
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* Try to transition the page to read/execute with `mprotect(PROT_READ |
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PROT_EXEC)`.
@@ -99,8 +97,8 @@ The probe deliberately does not execute the generated instruction. Executing a
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freshly written capability probe could terminate the process on systems that
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block generated code. The real trampoline emitter performs the same writable to
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executable transition when creating a callable trampoline and falls back when it
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is rejected. Windows currently returns false because the branch does not yet
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have a Win64 trampoline emitter or `VirtualAlloc`-based JIT memory support.
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is rejected. Windows uses `VirtualAlloc`, `VirtualProtect`, and
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`FlushInstructionCache` for the same probe.
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## Signature Eligibility
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@@ -110,8 +108,8 @@ keeps unsupported cases out of the trampoline emitters and lets
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Eligibility requires:
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* A supported platform emitter: AArch64 or x86\_64 SysV. Win64 is currently
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ineligible.
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* A supported platform emitter: AArch64, x86\_64 SysV, Win64 x64, PPC64LE
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ELFv2, LoongArch64, RISC-V 64, or s390x.
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* A return type that is numeric, pointer, or `void`.
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* Argument types that are numeric or pointer. `void` cannot be an argument.
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* No `function` typed argument or return value.
@@ -141,6 +139,56 @@ x86\_64 SysV eligibility mirrors `src/ffi/platforms/x64.cc`:
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incoming GP count is capped at 5 and buffer-shaped arguments cannot coexist
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with FP arguments.
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Win64 x64 eligibility mirrors the conservative Windows emitter in
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`src/ffi/platforms/x64.cc`:
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* The JavaScript receiver occupies the first positional register slot.
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* Public arguments are shifted from positions 1..3 into positions 0..2.
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* Integer and FP arguments are handled according to their positional Win64
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register slots.
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* Only scalar register-only signatures with at most three public arguments are
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currently eligible.
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* Buffer-shaped arguments and stack-passed arguments fall back.
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PPC64LE eligibility mirrors `src/ffi/platforms/ppc64.cc`:
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* `r3` is occupied by V8's receiver, so user GP arguments arrive in `r4..r10`.
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* FP arguments use FPRs and are not shifted by the receiver slot.
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* The generated trampoline shifts only GP registers and tail-branches to the
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target through `ctr`, with the target address in `r12` for ELFv2 global entry.
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* Only scalar register-only signatures are currently eligible.
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* Buffer-shaped arguments, stack-passed arguments, narrow returns, and PPC64BE
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platforms fall back. AIX/PPC64BE is intentionally a non-target for the current
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Fast FFI trampoline work because its ABI/linkage shape needs separate design.
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LoongArch64 eligibility mirrors `src/ffi/platforms/loong64.cc`:
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* `a0` is occupied by V8's receiver, so user GP arguments arrive in `a1..a7`.
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* FP arguments use `fa0..fa7` and are not shifted by the receiver slot.
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* The generated trampoline shifts only GP registers and tail-branches to the
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target through `jirl`.
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* Only scalar register-only signatures are currently eligible.
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* Buffer-shaped arguments, stack-passed arguments, and narrow returns fall back.
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173+
RISC-V 64 eligibility mirrors `src/ffi/platforms/riscv64.cc`:
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* `a0` is occupied by V8's receiver, so user GP arguments arrive in `a1..a7`.
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* FP arguments use `fa0..fa7` and are not shifted by the receiver slot.
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* The generated trampoline shifts only GP registers and tail-branches to the
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target through `jalr`.
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* Only scalar register-only signatures are currently eligible.
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* Buffer-shaped arguments, stack-passed arguments, and narrow returns fall back.
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s390x eligibility mirrors `src/ffi/platforms/s390x.cc`:
183+
184+
* `r2` is occupied by V8's receiver, so user GP arguments arrive in `r3..r6`.
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* FP arguments use `f0`, `f2`, `f4`, and `f6` and are not shifted by the receiver
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slot.
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* The generated trampoline shifts only GP registers and tail-branches to the
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target through `br`.
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* Only scalar register-only signatures are currently eligible.
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* Buffer-shaped arguments, stack-passed arguments, and narrow returns fall back.
191+
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The native trampoline generator still repeats its own register checks. The
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eligibility function is the early, centralized rejection point; the generator
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checks are a defense against direct or future callers.
@@ -395,9 +443,22 @@ Important limits are:
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* No stack arguments in the current AArch64 trampoline.
396444
* At most one stack-loaded scalar GP argument in the current x86\_64 SysV
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trampoline.
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* No stack arguments or buffer-shaped arguments in the current Win64 x64
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trampoline.
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* No stack arguments, buffer-shaped arguments, or narrow returns in the current
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PPC64LE trampoline.
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* No stack arguments, buffer-shaped arguments, or narrow returns in the current
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LoongArch64, RISC-V 64, and s390x trampolines.
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* No mixed buffer-shaped and FP arguments.
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* No `function` argument or return type in the Fast API path.
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Linux x86 and armv7 are experimental Node.js platforms, but the current Fast FFI
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trampoline model remains 64-bit only. They continue to use SharedBuffer or
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generic libffi fallback paths. Linux s390x is a Tier 2 Node.js platform, but
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bundled FFI is not currently enabled for that target; if built with
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`--shared-ffi`, scalar register-only Fast API FFI can use the s390x emitter. AIX
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PPC64BE is intentionally not covered by this implementation.
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These are optimization boundaries, not public FFI signature boundaries. User
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code can still call supported public FFI signatures through fallback paths.
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‎node.gyp‎

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@@ -475,6 +475,10 @@
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'src/node_ffi.cc',
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'src/node_ffi.h',
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'src/ffi/platforms/arm64.cc',
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'src/ffi/platforms/loong64.cc',
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'src/ffi/platforms/ppc64.cc',
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'src/ffi/platforms/riscv64.cc',
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'src/ffi/platforms/s390x.cc',
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'src/ffi/platforms/x64.cc',
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'src/ffi/data.cc',
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'src/ffi/data.h',

‎src/ffi/fast.cc‎

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@@ -222,7 +222,10 @@ FastFFIMetadata::~FastFFIMetadata() {
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bool IsFastCallSupported() {
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// Fast call requires both a platform stub emitter and working JIT memory.
225-
#if defined(__aarch64__) || defined(_M_ARM64) || defined(__x86_64__)
225+
#if defined(__aarch64__) || defined(_M_ARM64) || defined(__x86_64__) || \
226+
defined(_M_X64) || defined(__powerpc64__) || defined(__ppc64__) || \
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defined(__PPC64__) || defined(__loongarch64) || \
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(defined(__riscv) && __riscv_xlen == 64) || defined(__s390x__)
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return IsJitMemorySupported();
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#else
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return false;

‎src/ffi/jit_memory.cc‎

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@@ -2,42 +2,85 @@
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#include "ffi/jit_memory.h"
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5-
#if !defined(_WIN32)
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#include <sys/mman.h>
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#include <unistd.h>
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#include <cstdint>
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#include <cstring>
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#include <mutex>
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#if defined(_WIN32)
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#include <windows.h>
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#else
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#include <sys/mman.h>
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#include <unistd.h>
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1415
#if defined(__APPLE__)
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#include <libkern/OSCacheControl.h>
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#endif
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18-
#endif // !defined(_WIN32)
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#endif // defined(_WIN32)
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namespace node::ffi {
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namespace {
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24-
#if !defined(_WIN32)
25-
2625
bool SelfTest() {
27-
#if !defined(__aarch64__) && !defined(_M_ARM64) && !defined(__x86_64__)
26+
#if !defined(__aarch64__) && !defined(_M_ARM64) && !defined(__x86_64__) && \
27+
!defined(_M_X64) && !defined(__powerpc64__) && !defined(__ppc64__) && \
28+
!defined(__PPC64__) && !defined(__loongarch64) && \
29+
!(defined(__riscv) && __riscv_xlen == 64) && !defined(__s390x__)
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// No stub emitter for this platform; nothing to test.
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return false;
3032
#else
3133
#if defined(__aarch64__) || defined(_M_ARM64)
3234
// AArch64 BR LR: 0xD65F03C0
3335
constexpr uint32_t kInstruction = 0xD65F03C0;
3436
constexpr size_t kInstructionSize = sizeof(uint32_t);
37+
#elif defined(__powerpc64__) || defined(__ppc64__) || defined(__PPC64__)
38+
// PPC64 BLR: 0x4E800020
39+
constexpr uint32_t kInstruction = 0x4E800020;
40+
constexpr size_t kInstructionSize = sizeof(uint32_t);
41+
#elif defined(__loongarch64)
42+
// LoongArch64 JIRL zero, ra, 0
43+
constexpr uint32_t kInstruction = 0x4C000020;
44+
constexpr size_t kInstructionSize = sizeof(uint32_t);
45+
#elif defined(__riscv) && __riscv_xlen == 64
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// RISC-V JALR zero, ra, 0
47+
constexpr uint32_t kInstruction = 0x00008067;
48+
constexpr size_t kInstructionSize = sizeof(uint32_t);
49+
#elif defined(__s390x__)
50+
// s390x BR r14
51+
constexpr uint16_t kInstruction = 0x07fe;
52+
constexpr size_t kInstructionSize = sizeof(uint16_t);
3553
#else
3654
// x86_64 RET: 0xC3
3755
constexpr uint8_t kInstruction = 0xC3;
3856
constexpr size_t kInstructionSize = sizeof(uint8_t);
3957
#endif
4058

59+
#if defined(_WIN32)
60+
void* page = VirtualAlloc(
61+
nullptr, kInstructionSize, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
62+
if (page == nullptr) {
63+
return false;
64+
}
65+
66+
uint8_t* code = static_cast<uint8_t*>(page);
67+
#if defined(__aarch64__) || defined(_M_ARM64) || defined(__powerpc64__) || \
68+
defined(__ppc64__) || defined(__PPC64__) || defined(__loongarch64) || \
69+
(defined(__riscv) && __riscv_xlen == 64) || defined(__s390x__)
70+
std::memcpy(code, &kInstruction, kInstructionSize);
71+
#else
72+
code[0] = kInstruction;
73+
#endif
74+
75+
FlushInstructionCache(GetCurrentProcess(), page, kInstructionSize);
76+
77+
DWORD old_protect;
78+
const bool ok =
79+
VirtualProtect(page, kInstructionSize, PAGE_EXECUTE_READ, &old_protect) !=
80+
0;
81+
VirtualFree(page, 0, MEM_RELEASE);
82+
return ok;
83+
#else
4184
const size_t page_size = static_cast<size_t>(getpagesize());
4285
void* page = mmap(nullptr,
4386
page_size,
@@ -50,7 +93,9 @@ bool SelfTest() {
5093
}
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5295
uint8_t* code = static_cast<uint8_t*>(page);
53-
#if defined(__aarch64__) || defined(_M_ARM64)
96+
#if defined(__aarch64__) || defined(_M_ARM64) || defined(__powerpc64__) || \
97+
defined(__ppc64__) || defined(__PPC64__) || defined(__loongarch64) || \
98+
(defined(__riscv) && __riscv_xlen == 64) || defined(__s390x__)
5499
std::memcpy(code, &kInstruction, kInstructionSize);
55100
#elif defined(__x86_64__)
56101
code[0] = kInstruction;
@@ -84,25 +129,18 @@ bool SelfTest() {
84129
munmap(page, page_size);
85130
return ok;
86131
#endif
132+
#endif
87133
}
88134

89-
#endif // !defined(_WIN32)
90-
91135
} // namespace
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93137
bool IsJitMemorySupported() {
94-
#if defined(_WIN32)
95-
// Windows stub emitter and VirtualAlloc-based JIT memory support not yet
96-
// implemented. Return false so the fast-call path falls back to libffi.
97-
return false;
98-
#else
99138
// Run the self-test exactly once and publish only the final result, so
100139
// concurrent callers never observe a provisional value.
101140
static std::once_flag once;
102141
static bool supported = false;
103142
std::call_once(once, [] { supported = SelfTest(); });
104143
return supported;
105-
#endif
106144
}
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108146
} // namespace node::ffi

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