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Enable compilation for specific target

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By exposing the target information through `CompilerConfig`,
compiler(only LLVM at the moment) could create a machine with
different CPU feature flags other than current host, which makes it
capable to "cross compile" to some degree.

Update #959
This commit is contained in:
anb
2019-11-13 12:31:50 -08:00
parent ab59a418c3
commit 3b2d751c55
7 changed files with 54 additions and 12 deletions
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35
lib/llvm-backend/src/code.rs
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@ -8075,24 +8075,37 @@ impl ModuleCodeGenerator<LLVMFunctionCodeGenerator, LLVMBackend, CodegenError>
for LLVMModuleCodeGenerator
{
fn new() -> LLVMModuleCodeGenerator {
Self::new_with_target(None, None, None)
}
fn new_with_target(
triple: Option<String>,
cpu_name: Option<String>,
cpu_features: Option<String>,
) -> LLVMModuleCodeGenerator {
let context = Context::create();
let module = context.create_module("module");
Target::initialize_x86(&InitializationConfig {
asm_parser: true,
asm_printer: true,
base: true,
disassembler: true,
info: true,
machine_code: true,
});
let triple = TargetMachine::get_default_triple().to_string();
let triple = triple.unwrap_or(TargetMachine::get_default_triple().to_string());
match triple {
_ if triple.starts_with("x86") => Target::initialize_x86(&InitializationConfig {
asm_parser: true,
asm_printer: true,
base: true,
disassembler: true,
info: true,
machine_code: true,
}),
_ => unimplemented!("compile to target other than x86-64 is not supported"),
}
let target = Target::from_triple(&triple).unwrap();
let target_machine = target
.create_target_machine(
&triple,
&TargetMachine::get_host_cpu_name().to_string(),
&TargetMachine::get_host_cpu_features().to_string(),
&cpu_name.unwrap_or(TargetMachine::get_host_cpu_name().to_string()),
&cpu_features.unwrap_or(TargetMachine::get_host_cpu_features().to_string()),
OptimizationLevel::Aggressive,
RelocMode::Static,
CodeModel::Large,