#include /* Width of padded opcode names */ #define OP_WIDTH 20 /* Print various register and arguments to instructions */ static void dasm_print_slot(FILE * out, uint16_t index) { fprintf(out, "%d ", index); } static void dasm_print_i16(FILE * out, int16_t number) { fprintf(out, "#%d ", number); } static void dasm_print_i32(FILE * out, int32_t number) { fprintf(out, "#%d ", number); } static void dasm_print_f64(FILE * out, double number) { fprintf(out, "#%f ", number); } static void dasm_print_literal(FILE * out, uint16_t index) { fprintf(out, "(%d) ", index); } static void dasm_print_upvalue(FILE * out, uint16_t level, uint16_t index) { fprintf(out, "<%d, %d> ", level, index); } /* Print the name of the argument but pad it */ static void dasm_print_arg(FILE * out, const char * name) { uint32_t i = 0; char c; while ((c = *name++)) { putc(c, out); ++i; } for (; i < OP_WIDTH; ++i) fputc(' ', out); } /* Print instructions that take a fixed number of arguments */ static uint32_t dasm_fixed_op(FILE * out, const uint16_t * current, const char * name, uint32_t size) { uint32_t i; dasm_print_arg(out, name); for (i = 1; i <= size; ++i) dasm_print_slot(out, current[i]); return size + 1; } /* Print instructions that take a variable number of arguments */ static uint32_t dasm_varg_op(FILE * out, const uint16_t * current, const char * name, uint32_t extra) { uint32_t i, argCount; dasm_print_arg(out, name); for (i = 0; i < extra; ++i) { dasm_print_slot(out, current[i + 1]); } argCount = current[extra + 1]; fprintf(out, ": "); /* Argument separator */ for (i = 0; i < argCount; ++i) { dasm_print_slot(out, current[i + extra + 2]); } return argCount + extra + 2; } /* Print the disassembly for a function definition */ void gst_dasm_funcdef(FILE * out, GstFuncDef * def) { gst_dasm(out, def->byteCode, def->byteCodeLen); } /* Print the disassembly for a function */ void gst_dasm_function(FILE * out, GstFunction * f) { gst_dasm(out, f->def->byteCode, f->def->byteCodeLen); } /* Disassemble some bytecode and display it as opcode + arguments assembly */ void gst_dasm(FILE * out, uint16_t *byteCode, uint32_t len) { uint16_t *current = byteCode; uint16_t *end = byteCode + len; while (current < end) { switch (*current) { default: current += dasm_fixed_op(out, current, "unknown", 0); break; case GST_OP_ADD: current += dasm_fixed_op(out, current, "add", 3); break; case GST_OP_SUB: current += dasm_fixed_op(out, current, "sub", 3); break; case GST_OP_MUL: current += dasm_fixed_op(out, current, "mul", 3); break; case GST_OP_DIV: current += dasm_fixed_op(out, current, "div", 3); break; case GST_OP_NOT: current += dasm_fixed_op(out, current, "not", 2); break; case GST_OP_FLS: current += dasm_fixed_op(out, current, "loadFalse", 1); break; case GST_OP_TRU: current += dasm_fixed_op(out, current, "loadTrue", 1); break; case GST_OP_NIL: current += dasm_fixed_op(out, current, "loadNil", 1); break; case GST_OP_I16: dasm_print_arg(out, "loadInt16"); dasm_print_slot(out, current[1]); dasm_print_i16(out, ((int16_t *)current)[2]); current += 3; break; case GST_OP_UPV: dasm_print_arg(out, "loadUpValue"); dasm_print_slot(out, current[1]); dasm_print_upvalue(out, current[2], current[3]); current += 4; break; case GST_OP_JIF: dasm_print_arg(out, "jumpIf"); dasm_print_slot(out, current[1]); dasm_print_i32(out, ((int32_t *)(current + 2))[0]); current += 4; break; case GST_OP_JMP: dasm_print_arg(out, "jump"); dasm_print_i32(out, ((int32_t *)(current + 1))[0]); current += 3; break; case GST_OP_SUV: dasm_print_arg(out, "setUpValue"); dasm_print_slot(out, current[1]); dasm_print_upvalue(out, current[2], current[3]); current += 4; break; case GST_OP_CST: dasm_print_arg(out, "loadLiteral"); dasm_print_slot(out, current[1]); dasm_print_literal(out, current[2]); current += 3; break; case GST_OP_I32: dasm_print_arg(out, "loadInt32"); dasm_print_slot(out, current[1]); dasm_print_i32(out, ((int32_t *)(current + 2))[0]); current += 4; break; case GST_OP_F64: dasm_print_arg(out, "loadFloat64"); dasm_print_slot(out, current[1]); dasm_print_f64(out, ((double *)(current + 2))[0]); current += 6; break; case GST_OP_MOV: current += dasm_fixed_op(out, current, "move", 2); break; case GST_OP_CLN: dasm_print_arg(out, "makeClosure"); dasm_print_slot(out, current[1]); dasm_print_literal(out, current[2]); current += 3; break; case GST_OP_EQL: current += dasm_fixed_op(out, current, "equals", 3); break; case GST_OP_LTN: current += dasm_fixed_op(out, current, "lessThan", 3); break; case GST_OP_LTE: current += dasm_fixed_op(out, current, "lessThanEquals", 3); break; case GST_OP_ARR: current += dasm_varg_op(out, current, "array", 1); break; case GST_OP_DIC: current += dasm_varg_op(out, current, "object", 1); break; case GST_OP_TUP: current += dasm_varg_op(out, current, "tuple", 1); break; case GST_OP_GET: current += dasm_fixed_op(out, current, "get", 3); break; case GST_OP_SET: current += dasm_fixed_op(out, current, "set", 3); break; case GST_OP_ERR: current += dasm_fixed_op(out, current, "error", 1); break; case GST_OP_TRY: dasm_print_arg(out, "try"); dasm_print_slot(out, current[1]); dasm_print_i32(out, *(int32_t *)(current + 2)); current += 4; break; case GST_OP_UTY: current += dasm_fixed_op(out, current, "untry", 0); break; case GST_OP_RET: current += dasm_fixed_op(out, current, "return", 1); break; case GST_OP_RTN: current += dasm_fixed_op(out, current, "returnNil", 0); break; case GST_OP_CAL: current += dasm_varg_op(out, current, "call", 2); break; case GST_OP_TCL: current += dasm_varg_op(out, current, "tailCall", 1); break; } fprintf(out, "\n"); } }