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| 1 #include <stdio.h> |
| 2 #include <string.h> |
| 3 |
| 4 /* This is a libdl emulation library which provides the statically-linked LLVM |
| 5 * gold plugin as if it were dynamically loaded. |
| 6 * |
| 7 * The only supported usage is the following: |
| 8 * |
| 9 * void *plugin = dlopen("LLVMgold", RTLD_NOW); |
| 10 * void *onload_function = dlsym(plugin, "onload"); |
| 11 */ |
| 12 |
| 13 |
| 14 /* This must match RTLD_NOW in dlwrap.h */ |
| 15 #define RTLD_NOW 0x2 |
| 16 |
| 17 static int dummy; |
| 18 static int haserr = 0; |
| 19 static char errmsg[200]; |
| 20 |
| 21 /* This is not the real signature of this function, |
| 22 * but we just need the symbol address. |
| 23 */ |
| 24 void llvm_plugin_onload(); |
| 25 |
| 26 void *pnacl_dlopen(const char *filename, int flag) { |
| 27 void *ret; |
| 28 if (flag != 0 && flag != RTLD_NOW) { |
| 29 sprintf(errmsg, "Error: Unknown flag to pnacl_dlopen: %d\n", flag); |
| 30 haserr = 1; |
| 31 return NULL; |
| 32 } |
| 33 if (strstr(filename, "LLVMgold") == NULL) { |
| 34 sprintf(errmsg, "Error: Unexpected pnacl_dlopen: %s\n", filename); |
| 35 haserr = 1; |
| 36 return NULL; |
| 37 } |
| 38 return (void*)&dummy; |
| 39 } |
| 40 |
| 41 char *pnacl_dlerror(void) { |
| 42 if (haserr) { |
| 43 haserr = 0; |
| 44 return errmsg; |
| 45 } |
| 46 return NULL; |
| 47 } |
| 48 |
| 49 void *pnacl_dlsym(void *handle, const char *symbol) { |
| 50 if (handle != (void*)&dummy) { |
| 51 sprintf(errmsg, "Error: Unexpected pnacl_dlsym handle\n"); |
| 52 haserr = 1; |
| 53 return NULL; |
| 54 } |
| 55 |
| 56 if (strcmp(symbol, "onload") != 0) { |
| 57 sprintf(errmsg, "Error: Unexpected pnacl_dlsym symbol: %s\n", symbol); |
| 58 haserr = 1; |
| 59 return NULL; |
| 60 } |
| 61 return (void*)&llvm_plugin_onload; |
| 62 } |
| 63 |
| 64 int pnacl_dlclose(void *handle) { |
| 65 return 0; |
| 66 } |
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