started cdump.c:cosmoD_dump()

This commit is contained in:
CPunch 2023-05-25 19:41:13 -05:00 committed by cpunch
parent 3b13ae1624
commit 65d37838cd
2 changed files with 197 additions and 0 deletions

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src/cdump.c Normal file
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#include "cdump.h"
#include "cmem.h"
#include "cobj.h"
#include "cvalue.h"
typedef struct
{
CState *state;
const void *userData;
cosmo_Writer writer;
int writerStatus;
} DumpState;
static void writeCValue(DumpState *dstate, CValue val);
static void initDumpState(CState *state, DumpState *dstate, cosmo_Writer writer,
const void *userData)
{
dstate->state = state;
dstate->userData = userData;
dstate->writer = writer;
dstate->writerStatus = 0;
}
static void writeBlock(DumpState *dstate, const void *data, size_t size)
{
if (dstate->writerStatus == 0) {
dstate->writerStatus = dstate->writer(dstate->state, data, size, dstate->userData);
}
}
static void writeu8(DumpState *dstate, uint8_t d)
{
writeBlock(dstate, &d, sizeof(uint8_t));
}
static void writeu32(DumpState *dstate, uint32_t d)
{
writeBlock(dstate, &d, sizeof(uint32_t));
}
static void writeSize(DumpState *dstate, size_t d)
{
writeBlock(dstate, &d, sizeof(size_t));
}
static void writeVector(DumpState *dstate, const void *data, size_t size)
{
writeSize(dstate, size);
writeBlock(dstate, data, size);
}
static void writeHeader(DumpState *dstate)
{
writeBlock(dstate, COSMO_MAGIC, COSMO_MAGIC_LEN);
/* after the magic, we write some platform information */
writeu8(dstate, cosmoD_isBigEndian());
writeu8(dstate, sizeof(cosmo_Number));
writeu8(dstate, sizeof(size_t));
writeu8(dstate, sizeof(int));
}
static void writeCObjString(DumpState *dstate, CObjString *obj)
{
if (obj == NULL) { /* this is in case cobjfunction's name or module strings are null */
writeu32(dstate, 0);
return;
}
/* write string length */
writeu32(dstate, obj->length);
/* write string data */
writeBlock(dstate, obj->str, obj->length);
}
static void writeCObjFunction(DumpState *dstate, CObjFunction *obj)
{
writeCObjString(dstate, obj->name);
writeCObjString(dstate, obj->module);
writeu32(dstate, obj->args);
writeu32(dstate, obj->upvals);
writeu8(dstate, obj->variadic);
/* write chunk info */
writeVector(dstate, obj->chunk.buf, sizeof(uint8_t) * obj->chunk.count);
/* write line info */
writeVector(dstate, obj->chunk.lineInfo, sizeof(int) * obj->chunk.count);
/* write constants */
for (int i = 0; i < obj->chunk.constants.count; i++) {
writeCValue(dstate, obj->chunk.constants.values[i]);
}
}
#define WRITE_VAR(dstate, type, expression) \
{ \
type _tmp = expression; \
writeBlock(dstate, &_tmp, sizeof(_tmp)); \
break; \
}
static void writeCObj(DumpState *dstate, CObj *obj)
{
/*
we can kind of cheat here since our parser only emits a few very limited CObjs...
CChunks will only ever have the following CObj's in their constant table:
- COBJ_STRING
- COBJ_FUNCTION
the rest of the objects are created during runtime. yay!
*/
CObjType t = cosmoO_readType(obj);
/* write cobj type */
writeu8(dstate, t);
/* write object payload/body */
switch (t) {
case COBJ_STRING:
writeCObjString(dstate, (CObjString *)obj);
break;
case COBJ_FUNCTION:
writeCObjFunction(dstate, (CObjFunction *)obj);
break;
default:
break;
}
}
static void writeCValue(DumpState *dstate, CValue val)
{
CosmoType t = GET_TYPE(val);
/* write value type */
writeu8(dstate, t);
/* write value payload/body */
switch (t) {
case COSMO_TNUMBER:
WRITE_VAR(dstate, cosmo_Number, cosmoV_readNumber(val))
case COSMO_TBOOLEAN:
WRITE_VAR(dstate, bool, cosmoV_readBoolean(val))
case COSMO_TREF:
writeCObj(dstate, cosmoV_readRef(val));
break;
case COSMO_TNIL: /* fallthrough, no body */
default:
break;
}
}
#undef WRITE_VAR
bool cosmoD_isBigEndian()
{
union
{
uint32_t i;
uint8_t c[4];
} _indxint = {0xDEADB33F};
return _indxint.c[0] == 0xDE;
}
int cosmoD_dump(CState *state, CObjFunction *func, cosmo_Writer writer, const void *userData)
{
DumpState dstate;
initDumpState(state, &dstate, writer, userData);
writeHeader(&dstate);
writeCObjFunction(&dstate, func);
return dstate.writerStatus;
}

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#ifndef COSMO_DUMP_H
#define COSMO_DUMP_H
#include "cobj.h"
#include "cosmo.h"
#include <stdio.h>
#define COSMO_MAGIC "COS\x12"
#define COSMO_MAGIC_LEN 4
typedef int (*cosmo_Writer)(CState *state, const void *data, size_t size, const void *ud);
bool cosmoD_isBigEndian();
int cosmoD_dump(CState *state, CObjFunction *func, cosmo_Writer writer, const void *userData);
#endif