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Changed execute function to use function pointer array w/ S

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This commit is contained in:
Themis Demetriades 2024-06-12 18:42:32 +01:00
parent 297ec15436
commit 24fd0c4ad6
1 changed files with 20 additions and 31 deletions
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51
src/emulator/execute.c
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@ -16,44 +16,33 @@
// instruction if the shift flag is enabled. // instruction if the shift flag is enabled.
#define DPI_WIDEMOV_SHIFT 16 #define DPI_WIDEMOV_SHIFT 16
// Type definition for a pointer to a function that executes a particular type
// of a64instruction (requires pointer to the processor state to update, and a
// pointer to the instruction struct to execute).
typedef void (*executeFunction)(Machine *, a64inst_instruction *);
// Prototypes // Prototypes
static void executeSDT(Machine *state, a64inst_instruction *inst); static void executeSDT(Machine *state, a64inst_instruction *inst);
static void executeBranch(Machine *state, a64inst_instruction *inst); static void executeBranch(Machine *state, a64inst_instruction *inst);
static void executeDPImmediate(Machine *state, a64inst_instruction *inst); static void executeDPImmediate(Machine *state, a64inst_instruction *inst);
static void executeDPRegister(Machine *state, a64inst_instruction *inst); static void executeDPRegister(Machine *state, a64inst_instruction *inst);
// Halt function definition
static void executeHalt(Machine *state, a64inst_instruction *inst) { /*NOP*/ }
// Define a constant array mapping instruction type enum values to their
// corresponding execute functions
const executeFunction EXECUTE_FUNCTIONS[] =
{&executeDPImmediate,
&executeDPRegister,
&executeSDT,
&executeSDT,
&executeBranch,
&executeHalt};
// Main execute function
void execute(Machine *state, a64inst_instruction *inst) { void execute(Machine *state, a64inst_instruction *inst) {
EXECUTE_FUNCTIONS[inst->type](state, inst);
switch (inst->type) {
// Halt the program
case a64inst_HALT:
break;
// Execute a data processing immediate instruction
case a64inst_DPIMMEDIATE:
executeDPImmediate(state, inst);
break;
// Execute a branch instruction
case a64inst_BRANCH:
executeBranch(state, inst);
break;
// Execute a data processing register instruction
case a64inst_DPREGISTER:
executeDPRegister(state, inst);
break;
case a64inst_SINGLETRANSFER:
executeSDT(state, inst);
break;
// Unknown instruction
default:
break;
}
} }
// Updates N and Z condition codes given the machine and a result value // Updates N and Z condition codes given the machine and a result value