95 lines
3.7 KiB
Rust
95 lines
3.7 KiB
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://!rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://!www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://!opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// .debug_gdb_scripts binary section
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use llvm;
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use llvm::ValueRef;
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use trans::common::{C_bytes, CrateContext};
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use trans::declare;
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use trans::type_::Type;
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use middle::ty::ClosureTyper;
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use session::config::NoDebugInfo;
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use std::ffi::CString;
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use std::ptr;
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use syntax::attr;
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/// Inserts a side-effect free instruction sequence that makes sure that the
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/// .debug_gdb_scripts global is referenced, so it isn't removed by the linker.
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pub fn insert_reference_to_gdb_debug_scripts_section_global(ccx: &CrateContext) {
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if needs_gdb_debug_scripts_section(ccx) {
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let empty = CString::new("").unwrap();
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let gdb_debug_scripts_section_global =
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get_or_insert_gdb_debug_scripts_section_global(ccx);
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unsafe {
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let volative_load_instruction =
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llvm::LLVMBuildLoad(ccx.raw_builder(),
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gdb_debug_scripts_section_global,
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empty.as_ptr());
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llvm::LLVMSetVolatile(volative_load_instruction, llvm::True);
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}
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}
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}
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/// Allocates the global variable responsible for the .debug_gdb_scripts binary
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/// section.
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pub fn get_or_insert_gdb_debug_scripts_section_global(ccx: &CrateContext)
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-> llvm::ValueRef {
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let section_var_name = "__rustc_debug_gdb_scripts_section__";
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let section_var = unsafe {
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llvm::LLVMGetNamedGlobal(ccx.llmod(),
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section_var_name.as_ptr() as *const _)
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};
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if section_var == ptr::null_mut() {
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let section_name = b".debug_gdb_scripts\0";
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let section_contents = b"\x01gdb_load_rust_pretty_printers.py\0";
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unsafe {
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let llvm_type = Type::array(&Type::i8(ccx),
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section_contents.len() as u64);
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let section_var = declare::define_global(ccx, section_var_name,
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llvm_type).unwrap_or_else(||{
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ccx.sess().bug(&format!("symbol `{}` is already defined", section_var_name))
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});
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llvm::LLVMSetSection(section_var, section_name.as_ptr() as *const _);
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llvm::LLVMSetInitializer(section_var, C_bytes(ccx, section_contents));
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llvm::LLVMSetGlobalConstant(section_var, llvm::True);
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llvm::LLVMSetUnnamedAddr(section_var, llvm::True);
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llvm::SetLinkage(section_var, llvm::Linkage::LinkOnceODRLinkage);
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// This should make sure that the whole section is not larger than
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// the string it contains. Otherwise we get a warning from GDB.
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llvm::LLVMSetAlignment(section_var, 1);
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section_var
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}
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} else {
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section_var
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}
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}
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pub fn needs_gdb_debug_scripts_section(ccx: &CrateContext) -> bool {
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let omit_gdb_pretty_printer_section =
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attr::contains_name(&ccx.tcx()
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.map
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.krate()
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.attrs,
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"omit_gdb_pretty_printer_section");
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!omit_gdb_pretty_printer_section &&
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!ccx.sess().target.target.options.is_like_osx &&
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!ccx.sess().target.target.options.is_like_windows &&
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ccx.sess().opts.debuginfo != NoDebugInfo
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}
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