Auto merge of #47209 - eddyb:ccx, r=nikomatsakis

rustc_trans: reorganize CrateContext and rename context types.

Firstly, the `{Shared,Local}CrateContext` hasn't been meaningful for a while now, and this PR resolves it by moving all their fields to `CrateContext` and removing redundant accessor methods.

Secondly, this PR contains the following mass-renames:
* `ccx: CrateContext` -> `cx: CodegenCx`
* `mircx: MirContext` -> `fx: FunctionCx`
* `bcx: Builder` -> `bx: Builder`

r? @nikomatsakis

src/librustc_llvm/ffi.rs

@@ -1661,7 +1661,6 @@ extern "C" {
     pub fn LLVMRustArchiveMemberFree(Member: RustArchiveMemberRef);
 
     pub fn LLVMRustSetDataLayoutFromTargetMachine(M: ModuleRef, TM: TargetMachineRef);
-    pub fn LLVMRustGetModuleDataLayout(M: ModuleRef) -> TargetDataRef;
 
     pub fn LLVMRustBuildOperandBundleDef(Name: *const c_char,
                                          Inputs: *const ValueRef,

src/librustc_trans/asm.rs

@@ -27,7 +27,7 @@ use libc::{c_uint, c_char};
 
 // Take an inline assembly expression and splat it out via LLVM
 pub fn trans_inline_asm<'a, 'tcx>(
-    bcx: &Builder<'a, 'tcx>,
+    bx: &Builder<'a, 'tcx>,
     ia: &hir::InlineAsm,
     outputs: Vec<PlaceRef<'tcx>>,
     mut inputs: Vec<ValueRef>
@@ -39,13 +39,13 @@ pub fn trans_inline_asm<'a, 'tcx>(
     let mut indirect_outputs = vec![];
     for (i, (out, place)) in ia.outputs.iter().zip(&outputs).enumerate() {
         if out.is_rw {
-            inputs.push(place.load(bcx).immediate());
+            inputs.push(place.load(bx).immediate());
             ext_constraints.push(i.to_string());
         }
         if out.is_indirect {
-            indirect_outputs.push(place.load(bcx).immediate());
+            indirect_outputs.push(place.load(bx).immediate());
         } else {
-            output_types.push(place.layout.llvm_type(bcx.ccx));
+            output_types.push(place.layout.llvm_type(bx.cx));
         }
     }
     if !indirect_outputs.is_empty() {
@@ -58,7 +58,7 @@ pub fn trans_inline_asm<'a, 'tcx>(
 
     // Default per-arch clobbers
     // Basically what clang does
-    let arch_clobbers = match &bcx.sess().target.target.arch[..] {
+    let arch_clobbers = match &bx.sess().target.target.arch[..] {
         "x86" | "x86_64" => vec!["~{dirflag}", "~{fpsr}", "~{flags}"],
         _                => Vec::new()
     };
@@ -76,9 +76,9 @@ pub fn trans_inline_asm<'a, 'tcx>(
     // Depending on how many outputs we have, the return type is different
     let num_outputs = output_types.len();
     let output_type = match num_outputs {
-        0 => Type::void(bcx.ccx),
+        0 => Type::void(bx.cx),
         1 => output_types[0],
-        _ => Type::struct_(bcx.ccx, &output_types, false)
+        _ => Type::struct_(bx.cx, &output_types, false)
     };
 
     let dialect = match ia.dialect {
@@ -88,7 +88,7 @@ pub fn trans_inline_asm<'a, 'tcx>(
 
     let asm = CString::new(ia.asm.as_str().as_bytes()).unwrap();
     let constraint_cstr = CString::new(all_constraints).unwrap();
-    let r = bcx.inline_asm_call(
+    let r = bx.inline_asm_call(
         asm.as_ptr(),
         constraint_cstr.as_ptr(),
         &inputs,
@@ -101,28 +101,28 @@ pub fn trans_inline_asm<'a, 'tcx>(
     // Again, based on how many outputs we have
     let outputs = ia.outputs.iter().zip(&outputs).filter(|&(ref o, _)| !o.is_indirect);
     for (i, (_, &place)) in outputs.enumerate() {
-        let v = if num_outputs == 1 { r } else { bcx.extract_value(r, i as u64) };
-        OperandValue::Immediate(v).store(bcx, place);
+        let v = if num_outputs == 1 { r } else { bx.extract_value(r, i as u64) };
+        OperandValue::Immediate(v).store(bx, place);
     }
 
     // Store mark in a metadata node so we can map LLVM errors
     // back to source locations.  See #17552.
     unsafe {
         let key = "srcloc";
-        let kind = llvm::LLVMGetMDKindIDInContext(bcx.ccx.llcx(),
+        let kind = llvm::LLVMGetMDKindIDInContext(bx.cx.llcx,
             key.as_ptr() as *const c_char, key.len() as c_uint);
 
-        let val: llvm::ValueRef = C_i32(bcx.ccx, ia.ctxt.outer().as_u32() as i32);
+        let val: llvm::ValueRef = C_i32(bx.cx, ia.ctxt.outer().as_u32() as i32);
 
         llvm::LLVMSetMetadata(r, kind,
-            llvm::LLVMMDNodeInContext(bcx.ccx.llcx(), &val, 1));
+            llvm::LLVMMDNodeInContext(bx.cx.llcx, &val, 1));
     }
 }
 
-pub fn trans_global_asm<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
+pub fn trans_global_asm<'a, 'tcx>(cx: &CodegenCx<'a, 'tcx>,
                                   ga: &hir::GlobalAsm) {
     let asm = CString::new(ga.asm.as_str().as_bytes()).unwrap();
     unsafe {
-        llvm::LLVMRustAppendModuleInlineAsm(ccx.llmod(), asm.as_ptr());
+        llvm::LLVMRustAppendModuleInlineAsm(cx.llmod, asm.as_ptr());
     }
 }

src/librustc_trans/attributes.rs

@@ -24,7 +24,7 @@ use llvm::AttributePlace::Function;
 use llvm_util;
 pub use syntax::attr::{self, InlineAttr};
 use syntax::ast;
-use context::CrateContext;
+use context::CodegenCx;
 
 /// Mark LLVM function to use provided inline heuristic.
 #[inline]
@@ -67,27 +67,27 @@ pub fn naked(val: ValueRef, is_naked: bool) {
     Attribute::Naked.toggle_llfn(Function, val, is_naked);
 }
 
-pub fn set_frame_pointer_elimination(ccx: &CrateContext, llfn: ValueRef) {
+pub fn set_frame_pointer_elimination(cx: &CodegenCx, llfn: ValueRef) {
     // FIXME: #11906: Omitting frame pointers breaks retrieving the value of a
     // parameter.
-    if ccx.sess().must_not_eliminate_frame_pointers() {
+    if cx.sess().must_not_eliminate_frame_pointers() {
         llvm::AddFunctionAttrStringValue(
             llfn, llvm::AttributePlace::Function,
             cstr("no-frame-pointer-elim\0"), cstr("true\0"));
     }
 }
 
-pub fn set_probestack(ccx: &CrateContext, llfn: ValueRef) {
+pub fn set_probestack(cx: &CodegenCx, llfn: ValueRef) {
     // Only use stack probes if the target specification indicates that we
     // should be using stack probes
-    if !ccx.sess().target.target.options.stack_probes {
+    if !cx.sess().target.target.options.stack_probes {
         return
     }
 
     // Currently stack probes seem somewhat incompatible with the address
     // sanitizer. With asan we're already protected from stack overflow anyway
     // so we don't really need stack probes regardless.
-    match ccx.sess().opts.debugging_opts.sanitizer {
+    match cx.sess().opts.debugging_opts.sanitizer {
         Some(Sanitizer::Address) => return,
         _ => {}
     }
@@ -101,13 +101,13 @@ pub fn set_probestack(ccx: &CrateContext, llfn: ValueRef) {
 
 /// Composite function which sets LLVM attributes for function depending on its AST (#[attribute])
 /// attributes.
-pub fn from_fn_attrs(ccx: &CrateContext, llfn: ValueRef, id: DefId) {
+pub fn from_fn_attrs(cx: &CodegenCx, llfn: ValueRef, id: DefId) {
     use syntax::attr::*;
-    let attrs = ccx.tcx().get_attrs(id);
-    inline(llfn, find_inline_attr(Some(ccx.sess().diagnostic()), &attrs));
+    let attrs = cx.tcx.get_attrs(id);
+    inline(llfn, find_inline_attr(Some(cx.sess().diagnostic()), &attrs));
 
-    set_frame_pointer_elimination(ccx, llfn);
-    set_probestack(ccx, llfn);
+    set_frame_pointer_elimination(cx, llfn);
+    set_probestack(cx, llfn);
 
     for attr in attrs.iter() {
         if attr.check_name("cold") {
@@ -124,7 +124,7 @@ pub fn from_fn_attrs(ccx: &CrateContext, llfn: ValueRef, id: DefId) {
         }
     }
 
-    let target_features = ccx.tcx().target_features_enabled(id);
+    let target_features = cx.tcx.target_features_enabled(id);
     if !target_features.is_empty() {
         let val = CString::new(target_features.join(",")).unwrap();
         llvm::AddFunctionAttrStringValue(