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Rollup merge of #70289 - nnethercote:refactor-codegen, r=eddyb

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Refactor `codegen`

`codegen` in `src/librustc_codegen_llvm/back/write.rs` is long and has complex control flow. These commits refactor it and make it easier to understand.
This commit is contained in:
Mazdak Farrokhzad 2020-03-24 07:13:42 +01:00 • committed by GitHub
commit 170112cd15
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2 changed files with 99 additions and 104 deletions
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39
src/librustc_codegen_ssa/back/write.rs
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@ -51,6 +51,14 @@ use std::thread;
const PRE_LTO_BC_EXT: &str = "pre-lto.bc";
/// The kind of bitcode to embed in object files.
#[derive(PartialEq)]
pub enum EmbedBitcode {
None,
Marker,
Full,
}
/// Module-specific configuration for `optimize_and_codegen`.
pub struct ModuleConfig {
/// Names of additional optimization passes to run.
@ -74,7 +82,6 @@ pub struct ModuleConfig {
pub emit_no_opt_bc: bool,
pub emit_bc: bool,
pub emit_bc_compressed: bool,
pub emit_lto_bc: bool,
pub emit_ir: bool,
pub emit_asm: bool,
pub emit_obj: bool,
@ -94,8 +101,7 @@ pub struct ModuleConfig {
// emscripten's ecc compiler, when used as the linker.
pub obj_is_bitcode: bool,
pub no_integrated_as: bool,
pub embed_bitcode: bool,
pub embed_bitcode_marker: bool,
pub embed_bitcode: EmbedBitcode,
}
impl ModuleConfig {
@ -116,13 +122,11 @@ impl ModuleConfig {
emit_pre_lto_bc: false,
emit_bc: false,
emit_bc_compressed: false,
emit_lto_bc: false,
emit_ir: false,
emit_asm: false,
emit_obj: false,
obj_is_bitcode: false,
embed_bitcode: false,
embed_bitcode_marker: false,
embed_bitcode: EmbedBitcode::None,
no_integrated_as: false,
verify_llvm_ir: false,
@ -145,16 +149,15 @@ impl ModuleConfig {
self.new_llvm_pass_manager = sess.opts.debugging_opts.new_llvm_pass_manager;
self.obj_is_bitcode =
sess.target.target.options.obj_is_bitcode || sess.opts.cg.linker_plugin_lto.enabled();
let embed_bitcode =
sess.target.target.options.embed_bitcode || sess.opts.debugging_opts.embed_bitcode;
if embed_bitcode {
match sess.opts.optimize {
config::OptLevel::No | config::OptLevel::Less => {
self.embed_bitcode_marker = embed_bitcode;
self.embed_bitcode =
if sess.target.target.options.embed_bitcode || sess.opts.debugging_opts.embed_bitcode {
match sess.opts.optimize {
config::OptLevel::No | config::OptLevel::Less => EmbedBitcode::Marker,
_ => EmbedBitcode::Full,
}
_ => self.embed_bitcode = embed_bitcode,
}
}
} else {
EmbedBitcode::None
};
// Copy what clang does by turning on loop vectorization at O2 and
// slp vectorization at O3. Otherwise configure other optimization aspects
@ -190,7 +193,10 @@ impl ModuleConfig {
}
pub fn bitcode_needed(&self) -> bool {
self.emit_bc || self.obj_is_bitcode || self.emit_bc_compressed || self.embed_bitcode
self.emit_bc
|| self.obj_is_bitcode
|| self.emit_bc_compressed
|| self.embed_bitcode == EmbedBitcode::Full
}
}
@ -379,7 +385,6 @@ pub fn start_async_codegen<B: ExtraBackendMethods>(
modules_config.emit_no_opt_bc = true;
modules_config.emit_pre_lto_bc = true;
modules_config.emit_bc = true;
modules_config.emit_lto_bc = true;
metadata_config.emit_bc = true;
allocator_config.emit_bc = true;
}