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-rw-r--r--src/display.rs260
1 files changed, 260 insertions, 0 deletions
diff --git a/src/display.rs b/src/display.rs
new file mode 100644
index 0000000..036fb28
--- /dev/null
+++ b/src/display.rs
@@ -0,0 +1,260 @@
+use std::fmt;
+
+use crate::{Instruction, Opcode, Operand};
+
+impl fmt::Display for Instruction {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ if self.opcode == Opcode::OR {
+ match (self.operand(&self.operands[0]), self.operand(&self.operands[1]), self.operand(&self.operands[2])) {
+ (Some(a), Some(b), Some(Operand::Reg(0))) => {
+ return write!(f, "move {}, {}", a, b);
+ }
+ _ => {}
+ }
+ } else if self.opcode == Opcode::BEQ {
+ match (self.operand(&self.operands[0]), self.operand(&self.operands[1]), self.operand(&self.operands[2])) {
+ (Some(Operand::Reg(a)), Some(Operand::Reg(b)), Some(Operand::Imm(offs))) => {
+ if a == b {
+ if offs < 0 {
+ return write!(f, "b $-{:#x}", -offs);
+ } else {
+ return write!(f, "b $+{:#x}", offs);
+ }
+ }
+ }
+ _ => {}
+ }
+ } else if self.opcode == Opcode::SLL {
+ match (self.operand(&self.operands[0]), self.operand(&self.operands[1]), self.operand(&self.operands[2])) {
+ (Some(Operand::Reg(dest)), Some(Operand::Reg(src)), Some(Operand::Shift(0))) => {
+ // TODO: should this also test for dest == `zero`?
+ if dest == src {
+ return write!(f, "nop");
+ }
+ }
+ _ => { }
+ }
+ }
+
+ fn display_operand(f: &mut fmt::Formatter, opcode: &Opcode, op: &Operand) -> fmt::Result {
+ if *opcode == Opcode::LUI {
+ // we show the immediate of LUI as an unsigned integer, becaue the docs say so.
+ if let Operand::Imm(imm) = op {
+ return write!(f, "{:#x}", *imm as u16);
+ }
+ } else if let Operand::Imm(imm) = op {
+ if *imm < 0 {
+ return write!(f, "-{:#x}", -imm);
+ } else {
+ return write!(f, "{:#x}", imm);
+ }
+ }
+
+ write!(f, "{}", op)
+ }
+ write!(f, "{}", self.opcode)?;
+
+ let mut wrote_operand = false;
+ for op in self.operands.iter() {
+ match self.operand(op) {
+ Some(op) => {
+ if wrote_operand {
+ write!(f, ", ")?;
+ } else {
+ write!(f, " ")?;
+ wrote_operand = true;
+ }
+ display_operand(f, &self.opcode, &op)?;
+ }
+ _ => {
+ return Ok(());
+ }
+ }
+ }
+
+ Ok(())
+ }
+}
+
+impl fmt::Display for Operand {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ match self {
+ Operand::Reg(reg) => {
+ let name = [
+ "zero", "at",
+ "v0", "v1",
+ "a0", "a1", "a2", "a3",
+ "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7",
+ "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
+ "t8", "t9",
+ "k0", "k1",
+ "gp", "sp", "fp", "ra"
+ ][*reg as usize];
+ write!(f, "{}", name)
+ }
+ Operand::Imm(imm) => {
+ write!(f, "{:#x}", imm)
+ }
+ Operand::BaseOffset(reg, offs) => {
+ let name = [
+ "zero", "at",
+ "v0", "v1",
+ "a0", "a1", "a2", "a3",
+ "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7",
+ "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
+ "t8", "t9",
+ "k0", "k1",
+ "gp", "sp", "fp", "ra"
+ ][*reg as usize];
+ if *offs == 0 {
+ write!(f, "({})", name)
+ } else {
+ if *offs < 0 {
+ write!(f, "-{:#x}({})", -offs, name)
+ } else {
+ write!(f, "{:#x}({})", offs, name)
+ }
+ }
+ }
+ Operand::Shift(sa) => {
+ write!(f, "{:#x}", sa)
+ }
+ Operand::LongImm(imm) => {
+ write!(f, "{:#x}", imm)
+ }
+ Operand::JOffset(offs) => {
+ write!(f, "$+{:#x}", offs)
+ }
+ }
+ }
+}
+
+impl fmt::Display for Opcode {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ match self {
+ Opcode::J => write!(f, "j"),
+ Opcode::JAL => write!(f, "jal"),
+ Opcode::BEQ => write!(f, "beq"),
+ Opcode::BNE => write!(f, "bne"),
+ Opcode::BLEZ => write!(f, "blez"),
+ Opcode::BGTZ => write!(f, "bgtz"),
+ Opcode::ADDI => write!(f, "addi"),
+ Opcode::ADDIU => write!(f, "addiu"),
+ Opcode::SLTI => write!(f, "slti"),
+ Opcode::SLTIU => write!(f, "sltiu"),
+ Opcode::ANDI => write!(f, "andi"),
+ Opcode::ORI => write!(f, "ori"),
+ Opcode::XORI => write!(f, "xori"),
+ Opcode::LUI => write!(f, "lui"),
+ Opcode::COP1 => write!(f, "cop1"),
+ Opcode::COP2 => write!(f, "cop2"),
+ Opcode::COP3 => write!(f, "cop3"),
+ Opcode::COP4 => write!(f, "cop4"),
+ Opcode::BEQL => write!(f, "beql"),
+ Opcode::BNEL => write!(f, "bnel"),
+ Opcode::BLEZL => write!(f, "blezl"),
+ Opcode::BGTZL => write!(f, "bgtzl"),
+ Opcode::DADDI => write!(f, "daddi"),
+ Opcode::DADDIU => write!(f, "daddiu"),
+ Opcode::LDL => write!(f, "ldl"),
+ Opcode::LDR => write!(f, "ldr"),
+ Opcode::LB => write!(f, "lb"),
+ Opcode::LH => write!(f, "lh"),
+ Opcode::LWL => write!(f, "lwl"),
+ Opcode::LW => write!(f, "lw"),
+ Opcode::LBU => write!(f, "lbu"),
+ Opcode::LHU => write!(f, "lhu"),
+ Opcode::LWR => write!(f, "lwr"),
+ Opcode::LWU => write!(f, "lwu"),
+ Opcode::SB => write!(f, "sb"),
+ Opcode::SH => write!(f, "sh"),
+ Opcode::SWL => write!(f, "swl"),
+ Opcode::SW => write!(f, "sw"),
+ Opcode::SDL => write!(f, "sdl"),
+ Opcode::SDR => write!(f, "sdr"),
+ Opcode::SWR => write!(f, "swr"),
+ Opcode::LL => write!(f, "ll"),
+ Opcode::LWC1 => write!(f, "lwc1"),
+ Opcode::LWC2 => write!(f, "lwc2"),
+ Opcode::PREF => write!(f, "pref"),
+ Opcode::LLD => write!(f, "lld"),
+ Opcode::LDC1 => write!(f, "ldc1"),
+ Opcode::LDC2 => write!(f, "ldc2"),
+ Opcode::LD => write!(f, "ld"),
+ Opcode::SC => write!(f, "sc"),
+ Opcode::SWC1 => write!(f, "swc1"),
+ Opcode::SWC2 => write!(f, "swc2"),
+ Opcode::SCD => write!(f, "scd"),
+ Opcode::SDC1 => write!(f, "sdc1"),
+ Opcode::SDC2 => write!(f, "sdc2"),
+ Opcode::SD => write!(f, "sd"),
+ Opcode::SLL => write!(f, "sll"),
+ Opcode::SRL => write!(f, "srl"),
+ Opcode::SRA => write!(f, "sra"),
+ Opcode::SLLV => write!(f, "sllv"),
+ Opcode::SRLV => write!(f, "srlv"),
+ Opcode::SRAV => write!(f, "srav"),
+ Opcode::JR => write!(f, "jr"),
+ Opcode::JALR => write!(f, "jalr"),
+ Opcode::MOVZ => write!(f, "movz"),
+ Opcode::MOVN => write!(f, "movn"),
+ Opcode::SYSCALL => write!(f, "syscall"),
+ Opcode::BREAK => write!(f, "break"),
+ Opcode::SYNC => write!(f, "sync"),
+ Opcode::MFHI => write!(f, "mfhi"),
+ Opcode::MTHI => write!(f, "mthi"),
+ Opcode::MFLO => write!(f, "mflo"),
+ Opcode::MTLO => write!(f, "mtlo"),
+ Opcode::DSLLV => write!(f, "dsllv"),
+ Opcode::DSRLV => write!(f, "dsrlv"),
+ Opcode::DSRAV => write!(f, "dsrav"),
+ Opcode::MULT => write!(f, "mult"),
+ Opcode::MULTU => write!(f, "multu"),
+ Opcode::DIV => write!(f, "div"),
+ Opcode::DIVU => write!(f, "divu"),
+ Opcode::DMULT => write!(f, "dmult"),
+ Opcode::DMULTU => write!(f, "dmultu"),
+ Opcode::DDIV => write!(f, "ddiv"),
+ Opcode::DDIVU => write!(f, "ddivu"),
+ Opcode::ADD => write!(f, "add"),
+ Opcode::ADDU => write!(f, "addu"),
+ Opcode::SUB => write!(f, "sub"),
+ Opcode::SUBU => write!(f, "subu"),
+ Opcode::AND => write!(f, "and"),
+ Opcode::OR => write!(f, "or"),
+ Opcode::XOR => write!(f, "xor"),
+ Opcode::NOR => write!(f, "nor"),
+ Opcode::SLT => write!(f, "slt"),
+ Opcode::DADD => write!(f, "dadd"),
+ Opcode::DADDU => write!(f, "daddu"),
+ Opcode::DSUB => write!(f, "dsub"),
+ Opcode::DSUBU => write!(f, "dsubu"),
+ Opcode::TGE => write!(f, "tge"),
+ Opcode::TGEU => write!(f, "tgeu"),
+ Opcode::TLT => write!(f, "tlt"),
+ Opcode::TLTU => write!(f, "tltu"),
+ Opcode::TEQ => write!(f, "teq"),
+ Opcode::TNE => write!(f, "tne"),
+ Opcode::DSLL => write!(f, "dsll"),
+ Opcode::DSRL => write!(f, "dsrl"),
+ Opcode::DSRA => write!(f, "dsra"),
+ Opcode::DSLL32 => write!(f, "dsll32"),
+ Opcode::DSRL32 => write!(f, "dsrl32"),
+ Opcode::DSRA32 => write!(f, "dsra32"),
+ Opcode::BLTZ => write!(f, "bltz"),
+ Opcode::BGEZ => write!(f, "bgez"),
+ Opcode::BLTZL => write!(f, "bltzl"),
+ Opcode::BGEZL => write!(f, "bgezl"),
+ Opcode::TGEI => write!(f, "tgei"),
+ Opcode::TGEIU => write!(f, "tgeiu"),
+ Opcode::TLTI => write!(f, "tlti"),
+ Opcode::TLTIU => write!(f, "tltiu"),
+ Opcode::TEQI => write!(f, "teqi"),
+ Opcode::TNEI => write!(f, "tnei"),
+ Opcode::BLTZAL => write!(f, "bltzal"),
+ Opcode::BGEZAL => write!(f, "bgezal"),
+ Opcode::BLTZALL => write!(f, "bltzall"),
+ Opcode::BGEZALL => write!(f, "bgezall"),
+ }
+ }
+}
generated by cgit v1.1 at 2024-11-21 20:50:02 +0000