krgamestudios/Toy
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Started working on a decompiler, called 'bytecode inspector'

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It only has a few instructions for now, but I can flesh it out over
time.
This commit is contained in:
Kayne Ruse
2026-04-11 13:37:26 +10:00
parent 49a825aaf9
commit b32ea9f309
5 changed files with 273 additions and 97 deletions
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168
repl/main.c
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@@ -1,3 +1,5 @@
#include "bytecode_inspector.h"
#include "toy_console_colors.h"
#include "toy_lexer.h"
@@ -127,7 +129,7 @@ typedef struct CmdLine {
bool silentPrint;
bool silentAssert;
bool removeAssert;
bool verboseDebugPrint;
bool verbose;
} CmdLine;
void usageCmdLine(int argc, const char* argv[]) {
@@ -189,7 +191,7 @@ CmdLine parseCmdLine(int argc, const char* argv[]) {
.silentPrint = false,
.silentAssert = false,
.removeAssert = false,
.verboseDebugPrint = false,
.verbose = false,
};
for (int i = 1; i < argc; i++) {
@@ -239,7 +241,7 @@ CmdLine parseCmdLine(int argc, const char* argv[]) {
}
else if (!strcmp(argv[i], "-d") || !strcmp(argv[i], "--verbose")) {
cmd.verboseDebugPrint = true;
cmd.verbose = true;
}
else {
@@ -250,80 +252,6 @@ CmdLine parseCmdLine(int argc, const char* argv[]) {
return cmd;
}
//repl function
int repl(const char* filepath) {
//output options
Toy_setPrintCallback(printCallback);
Toy_setErrorCallback(errorAndContinueCallback);
Toy_setAssertFailureCallback(assertFailureAndContinueCallback);
//vars to use
char prompt[256];
getFileName(prompt, filepath);
unsigned int INPUT_BUFFER_SIZE = 4096;
char inputBuffer[INPUT_BUFFER_SIZE];
memset(inputBuffer, 0, INPUT_BUFFER_SIZE);
Toy_Bucket* bucket = Toy_allocateBucket(TOY_BUCKET_IDEAL);
Toy_VM vm;
Toy_initVM(&vm);
printf("%s> ", prompt); //shows the terminal prompt and begin
unsigned int runCount = 0; //used for initial preserveScope
//read from the terminal
while(fgets(inputBuffer, INPUT_BUFFER_SIZE, stdin)) {
//work around fgets() adding a newline
unsigned int length = strlen(inputBuffer);
if (inputBuffer[length - 1] == '\n') {
inputBuffer[--length] = '\0';
}
if (length == 0 || !inputBuffer[ strspn(inputBuffer, " \r\n\t") ]) {
printf("%s> ", prompt); //shows the terminal prompt and restart
continue;
}
//end
if (strlen(inputBuffer) == 4 && (strncmp(inputBuffer, "exit", 4) == 0 || strncmp(inputBuffer, "quit", 4) == 0)) {
break;
}
//parse the input, prep the VM for execution
Toy_Lexer lexer;
Toy_bindLexer(&lexer, inputBuffer);
Toy_Parser parser;
Toy_bindParser(&parser, &lexer);
Toy_Ast* ast = Toy_scanParser(&bucket, &parser); //Ast is in the bucket, so it doesn't need to be freed
//parsing error, retry
if (parser.error) {
printf("%s> ", prompt); //shows the terminal prompt
continue;
}
unsigned char* bytecode = Toy_compileToBytecode(ast);
Toy_bindVM(&vm, bytecode, runCount++ > 0);
//run
Toy_runVM(&vm);
//free the memory, and leave the VM ready for the next loop
Toy_resetVM(&vm, true);
free(bytecode);
printf("%s> ", prompt); //shows the terminal prompt
}
//cleanup all memory
Toy_freeVM(&vm);
Toy_freeBucket(&bucket);
return 0;
}
//debugging
static void debugStackPrint(Toy_Stack* stack) {
//DEBUG: if there's anything on the stack, print it
@@ -385,6 +313,87 @@ static void debugScopePrint(Toy_Scope* scope, int depth) {
}
}
//repl function
int repl(const char* filepath, bool verbose) {
//output options
Toy_setPrintCallback(printCallback);
Toy_setErrorCallback(errorAndContinueCallback);
Toy_setAssertFailureCallback(assertFailureAndContinueCallback);
//vars to use
char prompt[256];
getFileName(prompt, filepath);
unsigned int INPUT_BUFFER_SIZE = 4096;
char inputBuffer[INPUT_BUFFER_SIZE];
memset(inputBuffer, 0, INPUT_BUFFER_SIZE);
Toy_Bucket* bucket = Toy_allocateBucket(TOY_BUCKET_IDEAL);
Toy_VM vm;
Toy_initVM(&vm);
printf("%s> ", prompt); //shows the terminal prompt and begin
unsigned int runCount = 0; //used for initial preserveScope
//read from the terminal
while(fgets(inputBuffer, INPUT_BUFFER_SIZE, stdin)) {
//work around fgets() adding a newline
unsigned int length = strlen(inputBuffer);
if (inputBuffer[length - 1] == '\n') {
inputBuffer[--length] = '\0';
}
if (length == 0 || !inputBuffer[ strspn(inputBuffer, " \r\n\t") ]) {
printf("%s> ", prompt); //shows the terminal prompt and restart
continue;
}
//end
if (strlen(inputBuffer) == 4 && (strncmp(inputBuffer, "exit", 4) == 0 || strncmp(inputBuffer, "quit", 4) == 0)) {
break;
}
//parse the input, prep the VM for execution
Toy_Lexer lexer;
Toy_bindLexer(&lexer, inputBuffer);
Toy_Parser parser;
Toy_bindParser(&parser, &lexer);
Toy_Ast* ast = Toy_scanParser(&bucket, &parser); //Ast is in the bucket, so it doesn't need to be freed
//parsing error, retry
if (parser.error) {
printf("%s> ", prompt); //shows the terminal prompt
continue;
}
unsigned char* bytecode = Toy_compileToBytecode(ast);
Toy_bindVM(&vm, bytecode, runCount++ > 0);
//run
Toy_runVM(&vm);
//print the debug info
if (verbose) {
debugStackPrint(vm.stack);
debugScopePrint(vm.scope, 0);
inspect_bytecode(bytecode);
}
//free the memory, and leave the VM ready for the next loop
Toy_resetVM(&vm, true);
free(bytecode);
printf("%s> ", prompt); //shows the terminal prompt
}
//cleanup all memory
Toy_freeVM(&vm);
Toy_freeBucket(&bucket);
return 0;
}
//main file
int main(int argc, const char* argv[]) {
Toy_setPrintCallback(printCallback);
@@ -462,9 +471,10 @@ int main(int argc, const char* argv[]) {
Toy_runVM(&vm);
//print the debug info
if (cmd.verboseDebugPrint) { //URGENT: 'verbose' option is mainly for the WIP elements, like decompiler
if (cmd.verbose) {
debugStackPrint(vm.stack);
debugScopePrint(vm.scope, 0);
inspect_bytecode(bytecode);
}
//cleanup
@@ -472,7 +482,7 @@ int main(int argc, const char* argv[]) {
free(bytecode);
}
else {
repl(argv[0]);
repl(argv[0], cmd.verbose);
}
return 0;