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Prepare inbounds_gep for opaque pointers

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Implement inbounds_gep using LLVMBuildInBoundsGEP2 which takes an
explicit type argument instead of deriving it from a pointer type.
This commit is contained in:
Tomasz Miąsko 2021-08-01 00:00:00 +00:00
parent 4013e094f5
commit 77e5e17231
11 changed files with 61 additions and 22 deletions
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7
compiler/rustc_codegen_llvm/src/debuginfo/gdb.rs
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@ -15,12 +15,11 @@ use rustc_span::symbol::sym;
/// .debug_gdb_scripts global is referenced, so it isn't removed by the linker.
pub fn insert_reference_to_gdb_debug_scripts_section_global(bx: &mut Builder<'_, '_, '_>) {
if needs_gdb_debug_scripts_section(bx) {
let gdb_debug_scripts_section = get_or_insert_gdb_debug_scripts_section_global(bx);
let gdb_debug_scripts_section =
bx.const_bitcast(get_or_insert_gdb_debug_scripts_section_global(bx), bx.type_i8p());
// Load just the first byte as that's all that's necessary to force
// LLVM to keep around the reference to the global.
let indices = [bx.const_i32(0), bx.const_i32(0)];
let element = bx.inbounds_gep(gdb_debug_scripts_section, &indices);
let volative_load_instruction = bx.volatile_load(bx.type_i8(), element);
let volative_load_instruction = bx.volatile_load(bx.type_i8(), gdb_debug_scripts_section);
unsafe {
llvm::LLVMSetAlignment(volative_load_instruction, 1);
}