Subzero, Wasm: Link and run torture tests; bug fixes.

runtime/wasm-runtime.c

+//===- subzero/runtime/wasm-runtime.c - Subzero WASM runtime source -------===//
+//
+//                        The Subzero Code Generator
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the system calls required by the libc that is included
+// in WebAssembly programs.
+//
+//===----------------------------------------------------------------------===//
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+extern char WASM_MEMORY[];
+
+void env$$abort() {
+  fprintf(stderr, "Aborting...\n");
+  abort();
+}
+
+void env$$_abort() { env$$abort(); }
+
+void env$$exit(int Status) {
+  exit(Status);
+}
+void env$$_exit(int Status) { env$$exit(Status); }
+
+#define UNIMPLEMENTED(f)                                                       \
+  void env$$##f() {                                                            \
+    fprintf(stderr, "Unimplemented: " #f "\n");                                \
+    abort();                                                                   \
+  }
+
+UNIMPLEMENTED(sbrk)
+UNIMPLEMENTED(setjmp)
+UNIMPLEMENTED(longjmp)
+UNIMPLEMENTED(__assert_fail)
+UNIMPLEMENTED(__builtin_malloc)
+UNIMPLEMENTED(__builtin_apply)
+UNIMPLEMENTED(__builtin_apply_args)
+UNIMPLEMENTED(pthread_cleanup_push)
+UNIMPLEMENTED(pthread_cleanup_pop)
+UNIMPLEMENTED(pthread_self)
+UNIMPLEMENTED(abs)
+UNIMPLEMENTED(__floatditf)
+UNIMPLEMENTED(__floatsitf)
+UNIMPLEMENTED(__fixtfdi)
+UNIMPLEMENTED(__fixtfsi)
+UNIMPLEMENTED(__fixsfti)
+UNIMPLEMENTED(__netf2)
+UNIMPLEMENTED(__getf2)
+UNIMPLEMENTED(__eqtf2)
+UNIMPLEMENTED(__lttf2)
+UNIMPLEMENTED(__addtf3)
+UNIMPLEMENTED(__subtf3)
+UNIMPLEMENTED(__divtf3)
+UNIMPLEMENTED(__multf3)
+UNIMPLEMENTED(__multi3)
+UNIMPLEMENTED(__lock)
+UNIMPLEMENTED(__unlock)
+UNIMPLEMENTED(__syscall6)
+UNIMPLEMENTED(__syscall20)
+UNIMPLEMENTED(__syscall140)
+UNIMPLEMENTED(__syscall192)
+
+void *wasmPtr(int Index) {
+  // TODO (eholk): get the mask from the WASM file.
+  const int MASK = 0x3fffff;
+  Index &= MASK;
+
+  return WASM_MEMORY + Index;
+}
+
+extern int __szwasm_main(int, const char **);
+
+#define WASM_REF(Type, Index) ((Type *)wasmPtr(Index))
+#define WASM_DEREF(Type, Index) (*WASM_REF(Type, Index))
+
+int main(int argc, const char **argv) { return __szwasm_main(argc, argv); }
+
+/// sys_write
+int env$$__syscall4(int Which, int VarArgs) {
+  int Fd = WASM_DEREF(int, VarArgs + 0 * sizeof(int));
+  int Buffer = WASM_DEREF(int, VarArgs + 1 * sizeof(int));
+  int Length = WASM_DEREF(int, VarArgs + 2 * sizeof(int));
+
+  return write(Fd, WASM_REF(char *, Buffer), Length);
+}
+
+/// sys_open
+int env$$__syscall5(int Which, int VarArgs) {
+  int WasmPath = WASM_DEREF(int, VarArgs);
+  int Flags = WASM_DEREF(int, VarArgs + 4);
+  int Mode = WASM_DEREF(int, VarArgs + 8);
+  const char *Path = WASM_REF(char, WasmPath);
+
+  fprintf(stderr, "sys_open(%s, %d, %d)\n", Path, Flags, Mode);
+
+  return open(Path, Flags, Mode);
+}
+
+/// sys_ioctl
+int env$$__syscall54(int A, int B) {
+  int Fd = WASM_DEREF(int, B + 0 * sizeof(int));
+  int Op = WASM_DEREF(int, B + 1 * sizeof(int));
+  int ArgP = WASM_DEREF(int, B + 2 * sizeof(int));
+  // TODO (eholk): implement sys_ioctl
+  return -ENOTTY;
+}
+
+int env$$__syscall146(int Which, int VarArgs) {
+  fprintf(stderr, "syscall146\n");
+
+  int Fd = WASM_DEREF(int, VarArgs);
+  int Iov = WASM_DEREF(int, VarArgs + sizeof(int));
+  int Iovcnt = WASM_DEREF(int, VarArgs + 2 * sizeof(int));
+
+  fprintf(stderr, "  Fd=%d, Iov=%d (%p), Iovcnt=%d\n", Fd, Iov, wasmPtr(Iov),
+          Iovcnt);
+
+  int Count = 0;
+
+  for (int I = 0; I < Iovcnt; ++I) {
+    void *Ptr = WASM_REF(void, WASM_DEREF(int, Iov + I * 8));
+    int Length = WASM_DEREF(int, Iov + I * 8 + 4);
+
+    fprintf(stderr, "  [%d] write(%d, %p, %d) = ", I, Fd, Ptr, Length);
+    int Curr = write(Fd, Ptr, Length);
+
+    fprintf(stderr, "%d\n", Curr);
+
+    if (Curr < 0) {
+      return -1;
+    }
+    Count += Curr;
+  }
+  fprintf(stderr, "  Count = %d\n", Count);
+  return Count;
+}