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gmqcc/code.cpp

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C++
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#include <string.h>
#include "gmqcc.h"
/*
* We could use the old method of casting to uintptr_t then to void*
* or qcint_t; however, it's incredibly unsafe for two reasons.
* 1) The compilers aliasing optimization can legally make it unstable
* (it's undefined behaviour).
*
* 2) The cast itself depends on fresh storage (newly allocated in which
* ever function is using the cast macros), the contents of which are
* transferred in a way that the obligation to release storage is not
* propagated.
*/
typedef union {
void *enter;
qcint_t leave;
} code_hash_entry_t;
/* Some sanity macros */
#define CODE_HASH_ENTER(ENTRY) ((ENTRY).enter)
#define CODE_HASH_LEAVE(ENTRY) ((ENTRY).leave)
void code_push_statement(code_t *code, prog_section_statement_t *stmt_in, lex_ctx_t ctx)
{
prog_section_statement_t stmt = *stmt_in;
if (OPTS_FLAG(TYPELESS_STORES)) {
switch (stmt.opcode) {
case INSTR_LOAD_S:
case INSTR_LOAD_ENT:
case INSTR_LOAD_FLD:
case INSTR_LOAD_FNC:
stmt.opcode = INSTR_LOAD_F;
break;
case INSTR_STORE_S:
case INSTR_STORE_ENT:
case INSTR_STORE_FLD:
case INSTR_STORE_FNC:
stmt.opcode = INSTR_STORE_F;
break;
case INSTR_STOREP_S:
case INSTR_STOREP_ENT:
case INSTR_STOREP_FLD:
case INSTR_STOREP_FNC:
stmt.opcode = INSTR_STOREP_F;
break;
}
}
if (OPTS_FLAG(SORT_OPERANDS)) {
uint16_t pair;
switch (stmt.opcode) {
case INSTR_MUL_F:
case INSTR_MUL_V:
case INSTR_ADD_F:
case INSTR_EQ_F:
case INSTR_EQ_S:
case INSTR_EQ_E:
case INSTR_EQ_FNC:
case INSTR_NE_F:
case INSTR_NE_V:
case INSTR_NE_S:
case INSTR_NE_E:
case INSTR_NE_FNC:
case INSTR_AND:
case INSTR_OR:
case INSTR_BITAND:
case INSTR_BITOR:
if (stmt.o1.u1 < stmt.o2.u1) {
uint16_t a = stmt.o2.u1;
stmt.o1.u1 = stmt.o2.u1;
stmt.o2.u1 = a;
}
break;
case INSTR_MUL_VF: pair = INSTR_MUL_FV; goto case_pair_gen;
case INSTR_MUL_FV: pair = INSTR_MUL_VF; goto case_pair_gen;
case INSTR_LT: pair = INSTR_GT; goto case_pair_gen;
case INSTR_GT: pair = INSTR_LT; goto case_pair_gen;
case INSTR_LE: pair = INSTR_GT; goto case_pair_gen;
case INSTR_GE: pair = INSTR_LE;
case_pair_gen:
if (stmt.o1.u1 < stmt.o2.u1) {
uint16_t x = stmt.o1.u1;
stmt.o1.u1 = stmt.o2.u1;
stmt.o2.u1 = x;
stmt.opcode = pair;
}
break;
}
}
code->statements.push_back(stmt);
code->linenums.push_back(ctx.line);
code->columnnums.push_back(ctx.column);
}
void code_pop_statement(code_t *code)
{
code->statements.pop_back();
code->linenums.pop_back();
code->columnnums.pop_back();
}
void *code_t::operator new(std::size_t bytes) {
return mem_a(bytes);
}
void code_t::operator delete(void *ptr) {
mem_d(ptr);
}
code_t::code_t()
{
static lex_ctx_t empty_ctx = {0, 0, 0};
static prog_section_function_t empty_function = {0,0,0,0,0,0,0,{0,0,0,0,0,0,0,0}};
static prog_section_statement_t empty_statement = {0,{0},{0},{0}};
static prog_section_def_t empty_def = {0, 0, 0};
string_cache = util_htnew(OPTS_OPTIMIZATION(OPTIM_OVERLAP_STRINGS) ? 0x100 : 1024);
// The way progs.dat is suppose to work is odd, there needs to be
// some null (empty) statements, functions, and 28 globals
globals.insert(globals.begin(), 28, 0);
chars.push_back('\0');
functions.push_back(empty_function);
code_push_statement(this, &empty_statement, empty_ctx);
defs.push_back(empty_def);
fields.push_back(empty_def);
}
code_t::~code_t()
{
util_htdel(string_cache);
}
void *code_util_str_htgeth(hash_table_t *ht, const char *key, size_t bin);
uint32_t code_genstring(code_t *code, const char *str) {
size_t hash;
code_hash_entry_t existing;
if (!str)
return 0;
if (!*str) {
if (!code->string_cached_empty) {
code->string_cached_empty = code->chars.size();
code->chars.push_back(0);
}
return code->string_cached_empty;
}
if (OPTS_OPTIMIZATION(OPTIM_OVERLAP_STRINGS)) {
hash = ((unsigned char*)str)[strlen(str)-1];
CODE_HASH_ENTER(existing) = code_util_str_htgeth(code->string_cache, str, hash);
} else {
hash = util_hthash(code->string_cache, str);
CODE_HASH_ENTER(existing) = util_htgeth(code->string_cache, str, hash);
}
if (CODE_HASH_ENTER(existing))
return CODE_HASH_LEAVE(existing);
CODE_HASH_LEAVE(existing) = code->chars.size();
code->chars.insert(code->chars.end(), str, str + strlen(str) + 1);
util_htseth(code->string_cache, str, hash, CODE_HASH_ENTER(existing));
return CODE_HASH_LEAVE(existing);
}
qcint_t code_alloc_field (code_t *code, size_t qcsize)
{
qcint_t pos = (qcint_t)code->entfields;
code->entfields += qcsize;
return pos;
}
static size_t code_size_generic(code_t *code, prog_header_t *code_header, bool lno) {
size_t size = 0;
if (lno) {
size += 4; /* LNOF */
size += sizeof(uint32_t); /* version */
size += sizeof(code_header->defs.length);
size += sizeof(code_header->globals.length);
size += sizeof(code_header->fields.length);
size += sizeof(code_header->statements.length);
size += sizeof(code->linenums[0]) * code->linenums.size();
size += sizeof(code->columnnums[0]) * code->columnnums.size();
} else {
size += sizeof(prog_header_t);
size += sizeof(prog_section_statement_t) * code->statements.size();
size += sizeof(prog_section_def_t) * code->defs.size();
size += sizeof(prog_section_field_t) * code->fields.size();
size += sizeof(prog_section_function_t) * code->functions.size();
size += sizeof(int32_t) * code->globals.size();
size += 1 * code->chars.size();
}
return size;
}
#define code_size_binary(C, H) code_size_generic((C), (H), false)
#define code_size_debug(C, H) code_size_generic((C), (H), true)
static void code_create_header(code_t *code, prog_header_t *code_header, const char *filename, const char *lnofile) {
size_t i;
code_header->statements.offset = sizeof(prog_header_t);
code_header->statements.length = code->statements.size();
code_header->defs.offset = code_header->statements.offset + (sizeof(prog_section_statement_t) * code->statements.size());
code_header->defs.length = code->defs.size();
code_header->fields.offset = code_header->defs.offset + (sizeof(prog_section_def_t) * code->defs.size());
code_header->fields.length = code->fields.size();
code_header->functions.offset = code_header->fields.offset + (sizeof(prog_section_field_t) * code->fields.size());
code_header->functions.length = code->functions.size();
code_header->globals.offset = code_header->functions.offset + (sizeof(prog_section_function_t) * code->functions.size());
code_header->globals.length = code->globals.size();
code_header->strings.offset = code_header->globals.offset + (sizeof(int32_t) * code->globals.size());
code_header->strings.length = code->chars.size();
code_header->version = 6;
code_header->skip = 0;
if (OPTS_OPTION_BOOL(OPTION_FORCECRC))
code_header->crc16 = OPTS_OPTION_U16(OPTION_FORCED_CRC);
else
code_header->crc16 = code->crc;
code_header->entfield = code->entfields;
if (OPTS_FLAG(DARKPLACES_STRING_TABLE_BUG)) {
/* >= + P */
code->chars.push_back('\0'); /* > */
code->chars.push_back('\0'); /* = */
code->chars.push_back('\0'); /* P */
}
/* ensure all data is in LE format */
util_swap_header(*code_header);
util_swap_statements(code->statements);
util_swap_defs_fields(code->defs);
util_swap_defs_fields(code->fields);
util_swap_functions(code->functions);
util_swap_globals(code->globals);
if (!OPTS_OPTION_BOOL(OPTION_QUIET)) {
if (lnofile)
con_out("writing '%s' and '%s'...\n", filename, lnofile);
else
con_out("writing '%s'\n", filename);
}
if (!OPTS_OPTION_BOOL(OPTION_QUIET) &&
!OPTS_OPTION_BOOL(OPTION_PP_ONLY))
{
char buffer[1024];
con_out("\nOptimizations:\n");
for (i = 0; i < COUNT_OPTIMIZATIONS; ++i) {
if (opts_optimizationcount[i]) {
util_optimizationtostr(opts_opt_list[i].name, buffer, sizeof(buffer));
con_out(
" %s: %u\n",
buffer,
(unsigned int)opts_optimizationcount[i]
);
}
}
}
}
static void code_stats(const char *filename, const char *lnofile, code_t *code, prog_header_t *code_header) {
if (OPTS_OPTION_BOOL(OPTION_QUIET) ||
OPTS_OPTION_BOOL(OPTION_PP_ONLY))
return;
con_out("\nFile statistics:\n");
con_out(" dat:\n");
con_out(" name: %s\n", filename);
con_out(" size: %u (bytes)\n", code_size_binary(code, code_header));
con_out(" crc: 0x%04X\n", code->crc);
if (lnofile) {
con_out(" lno:\n");
con_out(" name: %s\n", lnofile);
con_out(" size: %u (bytes)\n", code_size_debug(code, code_header));
}
con_out("\n");
}
bool code_write(code_t *code, const char *filename, const char *lnofile) {
prog_header_t code_header;
FILE *fp = nullptr;
code_create_header(code, &code_header, filename, lnofile);
if (lnofile) {
uint32_t version = 1;
fp = fopen(lnofile, "wb");
if (!fp)
return false;
util_endianswap(&version, 1, sizeof(version));
util_endianswap(&code->linenums[0], code->linenums.size(), sizeof(code->linenums[0]));
util_endianswap(&code->columnnums[0], code->columnnums.size(), sizeof(code->columnnums[0]));
if (fwrite("LNOF", 4, 1, fp) != 1 ||
fwrite(&version, sizeof(version), 1, fp) != 1 ||
fwrite(&code_header.defs.length, sizeof(code_header.defs.length), 1, fp) != 1 ||
fwrite(&code_header.globals.length, sizeof(code_header.globals.length), 1, fp) != 1 ||
fwrite(&code_header.fields.length, sizeof(code_header.fields.length), 1, fp) != 1 ||
fwrite(&code_header.statements.length, sizeof(code_header.statements.length), 1, fp) != 1 ||
fwrite(&code->linenums[0], sizeof(code->linenums[0]), code->linenums.size(), fp) != code->linenums.size() ||
fwrite(&code->columnnums[0], sizeof(code->columnnums[0]), code->columnnums.size(), fp) != code->columnnums.size())
{
con_err("failed to write lno file\n");
}
fclose(fp);
fp = nullptr;
}
fp = fopen(filename, "wb");
if (!fp)
return false;
if (1 != fwrite(&code_header, sizeof(prog_header_t) , 1 , fp) ||
code->statements.size() != fwrite(&code->statements[0], sizeof(prog_section_statement_t), code->statements.size(), fp) ||
code->defs.size() != fwrite(&code->defs[0], sizeof(prog_section_def_t) , code->defs.size() , fp) ||
code->fields.size() != fwrite(&code->fields[0], sizeof(prog_section_field_t) , code->fields.size() , fp) ||
code->functions.size() != fwrite(&code->functions[0], sizeof(prog_section_function_t) , code->functions.size() , fp) ||
code->globals.size() != fwrite(&code->globals[0], sizeof(int32_t) , code->globals.size() , fp) ||
code->chars.size() != fwrite(&code->chars[0], 1 , code->chars.size() , fp))
{
fclose(fp);
return false;
}
fclose(fp);
code_stats(filename, lnofile, code, &code_header);
return true;
}
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