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102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
/*===- StorageProxy.c - OS implementation of the caching interface --------===*\
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* *
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* This file implements the interface that we will expect operating *
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* systems to implement if they wish to support offline cachine. *
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* *
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\*===----------------------------------------------------------------------===*/
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#include "OSInterface.h"
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#include "SysUtils.h"
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#include "llvm/Config/fcntl.h"
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#include "llvm/Config/unistd.h"
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#include "llvm/Config/sys/types.h"
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#include "llvm/Config/sys/stat.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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static const char CacheRoot[] = "/tmp/LLVMCache";
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static const char ExeSuffix[] = ".exe";
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char* computeCachedFile(const char *key) {
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/* CacheRoot + "/" + std::string(key) + ExeSuffix; */
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char *cacheFile = (char*) malloc(strlen(CacheRoot) + 1 + strlen(key) +
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strlen(ExeSuffix) + 1);
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char *pCacheFile = cacheFile;
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if (!cacheFile) return 0;
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memcpy(cacheFile, CacheRoot, strlen(CacheRoot));
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pCacheFile += strlen(CacheRoot);
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*pCacheFile++ = '/';
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memcpy(pCacheFile, key, strlen(key));
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pCacheFile += strlen(key);
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memcpy(pCacheFile, ExeSuffix, strlen(ExeSuffix));
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pCacheFile += strlen(ExeSuffix);
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*pCacheFile = 0; // Null-terminate
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return cacheFile;
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}
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/*
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* llvmStat - equivalent to stat(3), except the key may not necessarily
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* correspond to a file by that name, implementation is up to the OS.
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* Values returned in buf are similar as they are in Unix.
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*/
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void llvmStat(const char *key, struct stat *buf) {
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char* cacheFile = computeCachedFile(key);
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fprintf(stderr, "llvmStat(%s)\n", cacheFile);
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stat(cacheFile, buf);
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free(cacheFile);
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}
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/*
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* llvmWriteFile - implements a 'save' of a file in the OS. 'key' may not
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* necessarily map to a file of the same name.
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* Returns:
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* 0 - success
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* non-zero - error
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*/
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int llvmWriteFile(const char *key, const void *data, size_t len)
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{
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char* cacheFile = computeCachedFile(key);
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int fd = open(cacheFile, O_CREAT|O_WRONLY|O_TRUNC);
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free(cacheFile);
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if (fd < 0) return -1; // encountered an error
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if (write(fd, data, len)) return -1;
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if (fsync(fd)) return -1;
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if (close(fd)) return -1;
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return 0;
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}
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/*
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* llvmReadFile - tells the OS to load data corresponding to a particular key
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* somewhere into memory.
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* Returns:
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* 0 - failure
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* non-zero - address of loaded file
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*
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* Value of size is the length of data loaded into memory.
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*/
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void* llvmReadFile(const char *key, size_t *size) {
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char* cacheFile = computeCachedFile(key);
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if (!cacheFile) return 0;
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struct stat buf;
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stat(cacheFile, &buf);
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int fd = open(cacheFile, O_RDONLY);
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if (fd < 0) return 0; // encountered an error
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void* data = malloc(buf.st_size);
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if (read(fd, data, buf.st_size)) {
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free(data);
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return 0;
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}
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*size = buf.st_size;
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return data;
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}
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/*
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* llvmExecve - execute a file from cache. This is a temporary proof-of-concept
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* because we do not relocate what we can read from disk.
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*/
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int llvmExecve(const char *filename, char *const argv[], char *const envp[]) {
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char* cacheFile = computeCachedFile(filename);
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return executeProgram(cacheFile, argv, envp);
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}
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