gaia_assembler/backends/jvm/
mod.rs

1//! JVM (Java Virtual Machine) backend compiler
2
3use crate::{
4    backends::{Backend, GeneratedFiles},
5    config::GaiaConfig,
6    instruction::GaiaInstruction,
7    program::{GaiaFunction, GaiaProgram},
8    types::GaiaType,
9};
10use gaia_types::{
11    helpers::{AbiCompatible, ApiCompatible, Architecture, CompilationTarget},
12    GaiaError, Result,
13};
14use jvm_assembler::{
15    formats::{class::writer::ClassWriter, jasm::ast::to_jasm::JvmToJasmConverter},
16    program::{JvmAccessFlags, JvmField, JvmInstruction, JvmMethod, JvmProgram, JvmVersion},
17};
18use std::collections::HashMap;
19use crate::program::{GaiaConstant, GaiaGlobal};
20
21/// JVM Backend implementation
22#[derive(Default)]
23pub struct JvmBackend {}
24
25impl Backend for JvmBackend {
26    fn name(&self) -> &'static str {
27        "JVM"
28    }
29
30    fn primary_target(&self) -> CompilationTarget {
31        CompilationTarget { build: Architecture::JVM, host: AbiCompatible::JavaAssembly, target: ApiCompatible::JvmRuntime(8) }
32    }
33
34    fn match_score(&self, target: &CompilationTarget) -> f32 {
35        match target.build {
36            Architecture::JVM => match target.host {
37                // jasm output, 5% support
38                AbiCompatible::JavaAssembly => 5.0,
39                // bytecode output, 30% support
40                AbiCompatible::Unknown => 30.0,
41                _ => -100.0,
42            },
43            _ => -100.0,
44        }
45    }
46
47    fn generate(&self, program: &GaiaProgram, config: &GaiaConfig) -> Result<GeneratedFiles> {
48        let mut files = HashMap::new();
49
50        // 将 GaiaProgram 转换为 JvmProgram
51        let jvm_program = convert_gaia_to_jvm(program)?;
52
53        match config.target.host {
54            AbiCompatible::Unknown => {
55                // 生成 .class 字节码文件
56                let buffer = Vec::new();
57                let mut class_writer = ClassWriter::new(buffer);
58                let class_bytes = class_writer.write(&jvm_program).result?;
59                files.insert("main.class".to_string(), class_bytes);
60            }
61            AbiCompatible::JavaAssembly => {
62                // 生成 .jasm 汇编文件
63                let mut converter = JvmToJasmConverter::new();
64                let jasm_result = converter.convert(jvm_program);
65                match jasm_result.result {
66                    Ok(jasm_root) => {
67                        let jasm_string = format!("{:#?}", jasm_root);
68                        files.insert("main.jasm".to_string(), jasm_string.into_bytes());
69                    }
70                    Err(error) => return Err(error),
71                }
72            }
73            _ => return Err(GaiaError::custom_error(&format!("Unsupported host ABI: {:?}", config.target.host))),
74        }
75
76        Ok(GeneratedFiles { files, diagnostics: vec![] })
77    }
78}
79
80impl JvmBackend {
81    /// Generate JVM program from Gaia program
82    pub fn generate_program(program: &GaiaProgram) -> Result<JvmProgram> {
83        convert_gaia_to_jvm(program)
84    }
85}
86
87/// Convert GaiaProgram to JvmProgram
88fn convert_gaia_to_jvm(program: &GaiaProgram) -> Result<JvmProgram> {
89    let mut jvm_program = JvmProgram::new(program.name.clone());
90
91    // Set version information
92    jvm_program.version = JvmVersion { major: 52, minor: 0 }; // Java 8
93
94    // Set access flags
95    jvm_program.access_flags = JvmAccessFlags::PUBLIC;
96
97    // Convert functions
98    for function in &program.functions {
99        let jvm_method = convert_gaia_function_to_jvm(function)?;
100        jvm_program.add_method(jvm_method);
101    }
102
103    // Convert global variables to fields
104    if let Some(globals) = &program.globals {
105        for global in globals {
106            let jvm_field = convert_gaia_global_to_jvm_field(global)?;
107            jvm_program.add_field(jvm_field);
108        }
109    }
110
111    Ok(jvm_program)
112}
113
114/// Convert GaiaFunction to JvmMethod
115fn convert_gaia_function_to_jvm(function: &GaiaFunction) -> Result<JvmMethod> {
116    // 构建方法描述符
117    let descriptor = build_method_descriptor(&function.parameters, &function.return_type);
118
119    let mut method = JvmMethod::new(function.name.clone(), descriptor);
120
121    // 设置访问标志
122    method = method.with_public().with_static();
123
124    // 转换指令
125    for instruction in &function.instructions {
126        let jvm_instruction = convert_gaia_instruction_to_jvm(instruction)?;
127        method = method.with_instruction(jvm_instruction);
128    }
129
130    // 设置栈和局部变量大小（简化处理）
131    method = method.with_max_stack(10).with_max_locals(10);
132
133    Ok(method)
134}
135
136/// Convert GaiaGlobal to JvmField
137fn convert_gaia_global_to_jvm_field(global: &GaiaGlobal) -> Result<JvmField> {
138    let descriptor = convert_gaia_type_to_jvm_descriptor(&global.var_type);
139    let field = JvmField::new(global.name.clone(), descriptor).with_public().with_static();
140
141    Ok(field)
142}
143
144/// Convert GaiaInstruction to JvmInstruction
145fn convert_gaia_instruction_to_jvm(instruction: &GaiaInstruction) -> Result<JvmInstruction> {
146    match instruction {
147        GaiaInstruction::LoadConstant(constant) => match constant {
148            GaiaConstant::Integer64(value) => match *value {
149                0 => Ok(JvmInstruction::Iconst0),
150                1 => Ok(JvmInstruction::Iconst1),
151                2 => Ok(JvmInstruction::Iconst2),
152                3 => Ok(JvmInstruction::Iconst3),
153                4 => Ok(JvmInstruction::Iconst4),
154                5 => Ok(JvmInstruction::Iconst5),
155                -1 => Ok(JvmInstruction::IconstM1),
156                _ if *value >= -128 && *value <= 127 => Ok(JvmInstruction::Bipush { value: *value as i8 }),
157                _ if *value >= -32768 && *value <= 32767 => Ok(JvmInstruction::Sipush { value: *value as i16 }),
158                _ => Ok(JvmInstruction::Ldc { symbol: value.to_string() }),
159            },
160            GaiaConstant::Float64(value) => match *value {
161                0.0 => Ok(JvmInstruction::Fconst0),
162                1.0 => Ok(JvmInstruction::Fconst1),
163                2.0 => Ok(JvmInstruction::Fconst2),
164                _ => Ok(JvmInstruction::Ldc { symbol: value.to_string() }),
165            },
166            GaiaConstant::String(value) => Ok(JvmInstruction::Ldc { symbol: value.clone() }),
167            _ => Err(GaiaError::custom_error("Unsupported constant type for JVM")),
168        },
169        GaiaInstruction::LoadLocal(index) => match *index {
170            0 => Ok(JvmInstruction::Iload0),
171            1 => Ok(JvmInstruction::Iload1),
172            2 => Ok(JvmInstruction::Iload2),
173            3 => Ok(JvmInstruction::Iload3),
174            _ => Ok(JvmInstruction::Iload { index: *index as u16 }),
175        },
176        GaiaInstruction::StoreLocal(index) => match *index {
177            0 => Ok(JvmInstruction::Istore0),
178            1 => Ok(JvmInstruction::Istore1),
179            2 => Ok(JvmInstruction::Istore2),
180            3 => Ok(JvmInstruction::Istore3),
181            _ => Ok(JvmInstruction::Istore { index: *index as u16 }),
182        },
183        // 当前 GaiaInstruction 无独立 LoadArgument 变体；参数作为局部变量处理
184        GaiaInstruction::Add => Ok(JvmInstruction::Iadd),
185        GaiaInstruction::Subtract => Ok(JvmInstruction::Isub),
186        GaiaInstruction::Multiply => Ok(JvmInstruction::Imul),
187        GaiaInstruction::Divide => Ok(JvmInstruction::Idiv),
188        GaiaInstruction::Remainder => Ok(JvmInstruction::Irem),
189        GaiaInstruction::BitwiseAnd => Ok(JvmInstruction::Iand),
190        GaiaInstruction::BitwiseOr => Ok(JvmInstruction::Ior),
191        GaiaInstruction::BitwiseXor => Ok(JvmInstruction::Ixor),
192        GaiaInstruction::BitwiseNot => {
193            // JVM 没有直接的按位取反指令，使用 -1 异或实现
194            Err(GaiaError::custom_error("BitwiseNot not directly supported in JVM"))
195        }
196        GaiaInstruction::ShiftLeft => Ok(JvmInstruction::Ishl),
197        GaiaInstruction::ShiftRight => Ok(JvmInstruction::Ishr),
198        GaiaInstruction::Equal => {
199            // JVM 需要使用条件跳转指令实现比较
200            Err(GaiaError::custom_error("Equal comparison requires conditional branching in JVM"))
201        }
202        GaiaInstruction::NotEqual => Err(GaiaError::custom_error("NotEqual comparison requires conditional branching in JVM")),
203        GaiaInstruction::LessThan => Err(GaiaError::custom_error("LessThan comparison requires conditional branching in JVM")),
204        GaiaInstruction::GreaterThan => {
205            Err(GaiaError::custom_error("GreaterThan comparison requires conditional branching in JVM"))
206        }
207        GaiaInstruction::LessThanOrEqual => {
208            Err(GaiaError::custom_error("LessThanOrEqual comparison requires conditional branching in JVM"))
209        }
210        GaiaInstruction::GreaterThanOrEqual => {
211            Err(GaiaError::custom_error("GreaterThanOrEqual comparison requires conditional branching in JVM"))
212        }
213        GaiaInstruction::Jump(label) => Ok(JvmInstruction::Goto { target: label.clone() }),
214        GaiaInstruction::JumpIfTrue(label) => Ok(JvmInstruction::Ifne { target: label.clone() }),
215        GaiaInstruction::JumpIfFalse(label) => Ok(JvmInstruction::Ifeq { target: label.clone() }),
216        GaiaInstruction::Call(function_name, _arg_count) => {
217            // 假设是静态方法调用
218            Ok(JvmInstruction::Invokestatic {
219                class_name: "Main".to_string(),
220                method_name: function_name.clone(),
221                descriptor: "()V".to_string(), // 简化的描述符
222            })
223        }
224        GaiaInstruction::Return => Ok(JvmInstruction::Return),
225        GaiaInstruction::Label(_name) => {
226            // JVM 指令中标签不是独立的指令，需要在汇编时处理
227            Err(GaiaError::custom_error("Labels are handled during assembly, not as instructions"))
228        }
229        GaiaInstruction::Duplicate => Ok(JvmInstruction::Dup),
230        GaiaInstruction::Pop => Ok(JvmInstruction::Pop),
231        _ => Err(GaiaError::custom_error(&format!("Unsupported instruction for JVM: {:?}", instruction))),
232    }
233}
234
235/// Build JVM method descriptor from parameters and return type
236fn build_method_descriptor(parameters: &[GaiaType], return_type: &Option<GaiaType>) -> String {
237    let mut descriptor = String::from("(");
238
239    // 添加参数类型
240    for param in parameters {
241        descriptor.push_str(&convert_gaia_type_to_jvm_descriptor(param));
242    }
243
244    descriptor.push(')');
245
246    // 添加返回类型
247    match return_type {
248        Some(ret_type) => descriptor.push_str(&convert_gaia_type_to_jvm_descriptor(ret_type)),
249        None => descriptor.push('V'), // void
250    }
251
252    descriptor
253}
254
255/// Convert GaiaType to JVM type descriptor
256fn convert_gaia_type_to_jvm_descriptor(gaia_type: &GaiaType) -> String {
257    match gaia_type {
258        GaiaType::Integer => "I".to_string(),
259        GaiaType::Float => "F".to_string(),
260        GaiaType::Double => "D".to_string(),
261        GaiaType::Boolean => "Z".to_string(),
262        GaiaType::String => "Ljava/lang/String;".to_string(),
263        GaiaType::Void => "V".to_string(),
264        _ => "Ljava/lang/Object;".to_string(), // 默认为 Object
265    }
266}
gaia_assembler/backends/jvm/mod.rs

gaia_assembler/backends/jvm/
mod.rs
