diff options
Diffstat (limited to 'wasm2c/examples/fac/fac.c')
| -rw-r--r-- | wasm2c/examples/fac/fac.c | 97 |
1 files changed, 45 insertions, 52 deletions
diff --git a/wasm2c/examples/fac/fac.c b/wasm2c/examples/fac/fac.c index bd4ccb58..1365def8 100644 --- a/wasm2c/examples/fac/fac.c +++ b/wasm2c/examples/fac/fac.c @@ -18,6 +18,27 @@ #include "fac.h" +// Computes a pointer to an object of the given size in a little-endian memory. +// +// On a little-endian host, this is just &mem->data[addr] - the object's size is +// unused. On a big-endian host, it's &mem->data[mem->size - addr - n], where n +// is the object's size. +// +// Note that mem may be evaluated multiple times. +// +// Parameters: +// mem - The memory. +// addr - The address. +// n - The size of the object. +// +// Result: +// A pointer for an object of size n. +#if WABT_BIG_ENDIAN +#define MEM_ADDR(mem, addr, n) &(mem)->data[(mem)->size - (addr) - (n)] +#else +#define MEM_ADDR(mem, addr, n) &(mem)->data[addr] +#endif + #define TRAP(x) (wasm_rt_trap(WASM_RT_TRAP_##x), 0) #if WASM_RT_STACK_DEPTH_COUNT @@ -86,70 +107,42 @@ static inline bool func_types_eq(const wasm_rt_func_type_t a, #define FORCE_READ_FLOAT(var) #endif -#if WABT_BIG_ENDIAN static inline void load_data(void* dest, const void* src, size_t n) { if (!n) { return; } - size_t i = 0; - u8* dest_chars = dest; wasm_rt_memcpy(dest, src, n); - for (i = 0; i < (n >> 1); i++) { +#if WABT_BIG_ENDIAN + u8* dest_chars = dest; + for (size_t i = 0; i < (n >> 1); i++) { u8 cursor = dest_chars[i]; dest_chars[i] = dest_chars[n - i - 1]; dest_chars[n - i - 1] = cursor; } +#endif } -#define LOAD_DATA(m, o, i, s) \ - do { \ - RANGE_CHECK((&m), m.size - o - s, s); \ - load_data(&(m.data[m.size - 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->data[mem->size - 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->data[mem->size - addr - sizeof(t1)], &wrapped, \ - sizeof(t1)); \ - } -#else -static inline void load_data(void* dest, const void* src, size_t n) { - if (!n) { - return; - } - wasm_rt_memcpy(dest, src, n); -} -#define LOAD_DATA(m, o, i, s) \ - do { \ - RANGE_CHECK((&m), o, s); \ - load_data(&(m.data[o]), i, s); \ + +#define LOAD_DATA(m, o, i, s) \ + do { \ + RANGE_CHECK((&m), o, s); \ + 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->data[addr], 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(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->data[addr], &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(mem, addr, sizeof(t1)), &wrapped, sizeof(t1)); \ } -#endif DEFINE_LOAD(i32_load, u32, u32, u32, FORCE_READ_INT) DEFINE_LOAD(i64_load, u64, u64, u64, FORCE_READ_INT) @@ -499,7 +492,7 @@ static float wasm_sqrtf(float x) { static inline void memory_fill(wasm_rt_memory_t* mem, u32 d, u32 val, u32 n) { RANGE_CHECK(mem, d, n); - memset(mem->data + d, val, n); + memset(MEM_ADDR(mem, d, n), val, n); } static inline void memory_copy(wasm_rt_memory_t* dest, @@ -509,7 +502,7 @@ static inline void memory_copy(wasm_rt_memory_t* dest, u32 n) { RANGE_CHECK(dest, dest_addr, n); RANGE_CHECK(src, src_addr, n); - memmove(dest->data + dest_addr, src->data + src_addr, n); + memmove(MEM_ADDR(dest, dest_addr, n), MEM_ADDR(src, src_addr, n), n); } static inline void memory_init(wasm_rt_memory_t* dest, |