Do not reverse bytes for nullvm

- use buf and buf_len variables for readability
- added back word.h include
- hardcoded usesWasmByteOrder() to true

Fixes #294

Signed-off-by: Konstantin Maksimov <konstantin.maksimov@ibm.com>

Author: knm3000

src/exports.cc

@@ -693,9 +693,9 @@ Word writevImpl(Word fd, Word iovs, Word iovs_len, Word *nwritten_ptr) {
     }
     const auto *iovec = reinterpret_cast<const uint32_t *>(memslice.value().data());
     if (iovec[1] != 0U /* buf_len */) {
-      memslice = context->wasmVm()->getMemory(
-          wasmtoh(iovec[0], context->wasmVm()->usesWasmByteOrder()) /* buf */,
-          wasmtoh(iovec[1], context->wasmVm()->usesWasmByteOrder()) /* buf_len */);
+      const auto buf = wasmtoh(iovec[0], context->wasmVm()->usesWasmByteOrder());
+      const auto buf_len = wasmtoh(iovec[1], context->wasmVm()->usesWasmByteOrder());
+      memslice = context->wasmVm()->getMemory(buf, buf_len);
       if (!memslice) {
         return 21; // __WASI_EFAULT
       }

src/pairs_util.cc

@@ -21,6 +21,7 @@
 
 #include "include/proxy-wasm/exports.h"
 #include "include/proxy-wasm/limits.h"
+#include "include/proxy-wasm/word.h"
 
 namespace proxy_wasm {
 

src/v8/v8.cc

@@ -504,7 +504,7 @@ bool V8::getWord(uint64_t pointer, Word *word) {
   }
   uint32_t word32;
   ::memcpy(&word32, memory_->data() + pointer, size);
-  word->u64_ = wasmtoh(word32, usesWasmByteOrder());
+  word->u64_ = wasmtoh(word32, true);
   return true;
 }
 
@@ -517,7 +517,7 @@ bool V8::setWord(uint64_t pointer, Word word) {
   if (pointer + size > memory_->data_size()) {
     return false;
   }
-  uint32_t word32 = htowasm(word.u32(), usesWasmByteOrder());
+  uint32_t word32 = htowasm(word.u32(), true);
   ::memcpy(memory_->data() + pointer, &word32, size);
   return true;
 }

src/wamr/wamr.cc

@@ -369,7 +369,7 @@ bool Wamr::getWord(uint64_t pointer, Word *word) {
 
   uint32_t word32;
   ::memcpy(&word32, wasm_memory_data(memory_.get()) + pointer, size);
-  word->u64_ = wasmtoh(word32, usesWasmByteOrder());
+  word->u64_ = wasmtoh(word32, true);
   return true;
 }
 
@@ -378,7 +378,7 @@ bool Wamr::setWord(uint64_t pointer, Word word) {
   if (pointer + size > wasm_memory_data_size(memory_.get())) {
     return false;
   }
-  uint32_t word32 = htowasm(word.u32(), usesWasmByteOrder());
+  uint32_t word32 = htowasm(word.u32(), true);
   ::memcpy(wasm_memory_data(memory_.get()) + pointer, &word32, size);
   return true;
 }

src/wasmtime/wasmtime.cc

@@ -395,7 +395,7 @@ bool Wasmtime::getWord(uint64_t pointer, Word *word) {
 
   uint32_t word32;
   ::memcpy(&word32, wasm_memory_data(memory_.get()) + pointer, size);
-  word->u64_ = wasmtoh(word32, usesWasmByteOrder());
+  word->u64_ = wasmtoh(word32, true);
   return true;
 }
 
@@ -404,7 +404,7 @@ bool Wasmtime::setWord(uint64_t pointer, Word word) {
   if (pointer + size > wasm_memory_data_size(memory_.get())) {
     return false;
   }
-  uint32_t word32 = htowasm(word.u32(), usesWasmByteOrder());
+  uint32_t word32 = htowasm(word.u32(), true);
   ::memcpy(wasm_memory_data(memory_.get()) + pointer, &word32, size);
   return true;
 }

src/wavm/wavm.cc

@@ -390,12 +390,12 @@ bool Wavm::getWord(uint64_t pointer, Word *data) {
   auto *p = reinterpret_cast<char *>(memory_base_ + pointer);
   uint32_t data32;
   memcpy(&data32, p, sizeof(uint32_t));
-  data->u64_ = wasmtoh(data32, usesWasmByteOrder());
+  data->u64_ = wasmtoh(data32, true);
   return true;
 }
 
 bool Wavm::setWord(uint64_t pointer, Word data) {
-  uint32_t data32 = htowasm(data.u32(), usesWasmByteOrder());
+  uint32_t data32 = htowasm(data.u32(), true);
   return setMemory(pointer, sizeof(uint32_t), &data32);
 }