diff options
Diffstat (limited to 'wasm2c/examples/fac/fac.c')
| -rw-r--r-- | wasm2c/examples/fac/fac.c | 71 |
1 files changed, 58 insertions, 13 deletions
diff --git a/wasm2c/examples/fac/fac.c b/wasm2c/examples/fac/fac.c index 1365def8..d9f821df 100644 --- a/wasm2c/examples/fac/fac.c +++ b/wasm2c/examples/fac/fac.c @@ -39,6 +39,48 @@ #define MEM_ADDR(mem, addr, n) &(mem)->data[addr] #endif +#ifndef WASM_RT_USE_SEGUE +// Memory functions can use the segue optimization if allowed. The segue +// optimization uses x86 segments to point to a linear memory. We use this +// optimization when: +// +// (1) Segue is allowed using WASM_RT_ALLOW_SEGUE +// (2) on x86_64 without WABT_BIG_ENDIAN enabled +// (3) the Wasm module uses a single unshared imported or exported memory +// (4) the compiler supports: intrinsics for (rd|wr)(fs|gs)base, "address +// namespaces" for accessing pointers, and supports memcpy on pointers with +// custom "address namespaces". GCC does not support the memcpy requirement, +// so this leaves only clang for now. +#if WASM_RT_ALLOW_SEGUE && !WABT_BIG_ENDIAN && \ + (defined(__x86_64__) || defined(_M_X64)) && \ + WASM_RT_MODULE_IS_SINGLE_UNSHARED_MEMORY && __clang__ && \ + __has_builtin(__builtin_ia32_wrgsbase64) +#define WASM_RT_USE_SEGUE 1 +#else +#define WASM_RT_USE_SEGUE 0 +#endif +#endif + +#if WASM_RT_USE_SEGUE +// Different segments are free on different platforms +// Windows uses GS for TLS, FS is free +// Linux uses FS for TLS, GS is free +#if defined(__WIN32) +#define WASM_RT_SEGUE_READ_BASE() __builtin_ia32_rdfsbase64() +#define WASM_RT_SEGUE_WRITE_BASE(base) \ + __builtin_ia32_wrfsbase64((uintptr_t)base) +#define MEM_ADDR_MEMOP(mem, addr, n) ((uint8_t __seg_fs*)(uintptr_t)addr) +#else +// POSIX style OS +#define WASM_RT_SEGUE_READ_BASE() __builtin_ia32_rdgsbase64() +#define WASM_RT_SEGUE_WRITE_BASE(base) \ + __builtin_ia32_wrgsbase64((uintptr_t)base) +#define MEM_ADDR_MEMOP(mem, addr, n) ((uint8_t __seg_gs*)(uintptr_t)addr) +#endif +#else +#define MEM_ADDR_MEMOP(mem, addr, n) MEM_ADDR(mem, addr, n) +#endif + #define TRAP(x) (wasm_rt_trap(WASM_RT_TRAP_##x), 0) #if WASM_RT_STACK_DEPTH_COUNT @@ -128,20 +170,22 @@ static inline void load_data(void* dest, const void* src, size_t n) { load_data(MEM_ADDR(&m, o, s), i, s); \ } while (0) -#define DEFINE_LOAD(name, t1, t2, t3, force_read) \ - static inline t3 name(wasm_rt_memory_t* mem, u64 addr) { \ - MEMCHECK(mem, addr, t1); \ - t1 result; \ - wasm_rt_memcpy(&result, MEM_ADDR(mem, addr, sizeof(t1)), sizeof(t1)); \ - force_read(result); \ - return (t3)(t2)result; \ +#define DEFINE_LOAD(name, t1, t2, t3, force_read) \ + static inline t3 name(wasm_rt_memory_t* mem, u64 addr) { \ + MEMCHECK(mem, addr, t1); \ + t1 result; \ + wasm_rt_memcpy(&result, MEM_ADDR_MEMOP(mem, addr, sizeof(t1)), \ + sizeof(t1)); \ + force_read(result); \ + return (t3)(t2)result; \ } -#define DEFINE_STORE(name, t1, t2) \ - static inline void name(wasm_rt_memory_t* mem, u64 addr, t2 value) { \ - MEMCHECK(mem, addr, t1); \ - t1 wrapped = (t1)value; \ - wasm_rt_memcpy(MEM_ADDR(mem, addr, sizeof(t1)), &wrapped, sizeof(t1)); \ +#define DEFINE_STORE(name, t1, t2) \ + static inline void name(wasm_rt_memory_t* mem, u64 addr, t2 value) { \ + MEMCHECK(mem, addr, t1); \ + t1 wrapped = (t1)value; \ + wasm_rt_memcpy(MEM_ADDR_MEMOP(mem, addr, sizeof(t1)), &wrapped, \ + sizeof(t1)); \ } DEFINE_LOAD(i32_load, u32, u32, u32, FORCE_READ_INT) @@ -656,7 +700,8 @@ FUNC_TYPE_T(w2c_fac_t0) = "\x07\x80\x96\x7a\x42\xf7\x3e\xe6\x70\x5c\x2f\xac\x83\ /* export: 'fac' */ u32 w2c_fac_fac(w2c_fac* instance, u32 var_p0) { - return w2c_fac_fac_0(instance, var_p0); + u32 ret = w2c_fac_fac_0(instance, var_p0); + return ret; } void wasm2c_fac_instantiate(w2c_fac* instance) { |