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/*
* Android "Almost" C Compiler.
* This is a compiler for a small subset of the C language, intended for use
* in scripting environments where speed and memory footprint are important.
*
* This code is based upon the "unobfuscated" version of the
* Obfuscated Tiny C compiler, see the file LICENSE for details.
*
*/
#include <ctype.h>
#include <dlfcn.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if defined(__arm__)
#include <unistd.h>
#endif
#if defined(__arm__)
#define PROVIDE_ARM_DISASSEMBLY
#endif
#ifdef PROVIDE_ARM_DISASSEMBLY
#include "disassem.h"
#endif
#include <acc/acc.h>
typedef int (*MainPtr)(int, char**);
// This is a separate function so it can easily be set by breakpoint in gdb.
int run(MainPtr mainFunc, int argc, char** argv) {
return mainFunc(argc, argv);
}
ACCvoid* symbolLookup(ACCvoid* pContext, const ACCchar* name) {
return (ACCvoid*) dlsym(RTLD_DEFAULT, name);
}
#ifdef PROVIDE_ARM_DISASSEMBLY
static FILE* disasmOut;
static u_int
disassemble_readword(u_int address)
{
return(*((u_int *)address));
}
static void
disassemble_printaddr(u_int address)
{
fprintf(disasmOut, "0x%08x", address);
}
static void
disassemble_printf(const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
vfprintf(disasmOut, fmt, ap);
va_end(ap);
}
static int disassemble(ACCscript* script, FILE* out) {
disasmOut = out;
disasm_interface_t di;
di.di_readword = disassemble_readword;
di.di_printaddr = disassemble_printaddr;
di.di_printf = disassemble_printf;
ACCvoid* base;
ACCsizei length;
accGetProgramBinary(script, &base, &length);
unsigned long* pBase = (unsigned long*) base;
unsigned long* pEnd = (unsigned long*) (((unsigned char*) base) + length);
for(unsigned long* pInstruction = pBase; pInstruction < pEnd; pInstruction++) {
fprintf(out, "%08x: %08x ", (int) pInstruction, (int) *pInstruction);
::disasm(&di, (uint) pInstruction, 0);
}
return 0;
}
#endif // PROVIDE_ARM_DISASSEMBLY
int main(int argc, char** argv) {
const char* inFile = NULL;
bool printListing;
bool runResults = false;
FILE* in = stdin;
int i;
for (i = 1; i < argc; i++) {
char* arg = argv[i];
if (arg[0] == '-') {
switch (arg[1]) {
case 'S':
printListing = true;
break;
case 'R':
runResults = true;
break;
default:
fprintf(stderr, "Unrecognized flag %s\n", arg);
return 3;
}
} else if (inFile == NULL) {
inFile = arg;
} else {
break;
}
}
if (! inFile) {
fprintf(stderr, "input file required\n");
return 2;
}
if (inFile) {
in = fopen(inFile, "r");
if (!in) {
fprintf(stderr, "Could not open input file %s\n", inFile);
return 1;
}
}
fseek(in, 0, SEEK_END);
size_t fileSize = (size_t) ftell(in);
rewind(in);
ACCchar* text = new ACCchar[fileSize + 1];
size_t bytesRead = fread(text, 1, fileSize, in);
if (bytesRead != fileSize) {
fprintf(stderr, "Could not read all of file %s\n", inFile);
}
text[fileSize] = '\0';
ACCscript* script = accCreateScript();
const ACCchar* scriptSource[] = {text};
accScriptSource(script, 1, scriptSource, NULL);
delete[] text;
accRegisterSymbolCallback(script, symbolLookup, NULL);
accCompileScript(script);
int result = accGetError(script);
MainPtr mainPointer = 0;
if (result != 0) {
ACCsizei bufferLength;
accGetScriptInfoLog(script, 0, &bufferLength, NULL);
char* buf = (char*) malloc(bufferLength + 1);
if (buf != NULL) {
accGetScriptInfoLog(script, bufferLength + 1, NULL, buf);
fprintf(stderr, "%s", buf);
free(buf);
} else {
fprintf(stderr, "Out of memory.\n");
}
goto exit;
}
{
ACCsizei numPragmaStrings;
accGetPragmas(script, &numPragmaStrings, 0, NULL);
if (numPragmaStrings) {
char** strings = new char*[numPragmaStrings];
accGetPragmas(script, NULL, numPragmaStrings, strings);
for(ACCsizei i = 0; i < numPragmaStrings; i += 2) {
fprintf(stderr, "#pragma %s(%s)\n", strings[i], strings[i+1]);
}
delete[] strings;
}
}
if (printListing) {
#ifdef PROVIDE_ARM_DISASSEMBLY
disassemble(script, stderr);
#endif
}
if (runResults) {
accGetScriptLabel(script, "main", (ACCvoid**) & mainPointer);
result = accGetError(script);
if (result != ACC_NO_ERROR) {
fprintf(stderr, "Could not find main: %d\n", result);
} else {
fprintf(stderr, "Executing compiled code:\n");
int codeArgc = argc - i + 1;
char** codeArgv = argv + i - 1;
codeArgv[0] = (char*) (inFile ? inFile : "stdin");
result = run(mainPointer, codeArgc, codeArgv);
fprintf(stderr, "result: %d\n", result);
}
}
exit:
accDeleteScript(script);
return result;
}
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