moved crates in lib/ to src/, renamed crates, modified some files' text (#660)

2019-01-28 18:56:54 -05:00
parent 54959cf5bb
commit 747ad3c4c5
508 changed files with 94 additions and 92 deletions
--- a/cranelift/faerie/src/container.rs
+++ b/cranelift/faerie/src/container.rs
@@ -0,0 +1,65 @@
+//! Utilities for working with Faerie container formats.
+
+use cranelift_codegen::binemit::Reloc;
+use target_lexicon::{Architecture, BinaryFormat, Triple};
+
+/// An object file format.
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub enum Format {
+    /// The ELF object file format.
+    ELF,
+    /// The Mach-O object file format.
+    MachO,
+}
+
+/// Translate from a Cranelift `Reloc` to a raw object-file-format-specific
+/// relocation code and relocation-implied addend.
+pub fn raw_relocation(reloc: Reloc, triple: &Triple) -> (u32, i64) {
+    match triple.binary_format {
+        BinaryFormat::Elf => {
+            use goblin::elf;
+            (
+                match triple.architecture {
+                    Architecture::X86_64 => {
+                        match reloc {
+                            Reloc::Abs4 => elf::reloc::R_X86_64_32,
+                            Reloc::Abs8 => elf::reloc::R_X86_64_64,
+                            Reloc::X86PCRel4 | Reloc::X86CallPCRel4 => elf::reloc::R_X86_64_PC32,
+                            // TODO: Get Cranelift to tell us when we can use
+                            // R_X86_64_GOTPCRELX/R_X86_64_REX_GOTPCRELX.
+                            Reloc::X86CallPLTRel4 => elf::reloc::R_X86_64_PLT32,
+                            Reloc::X86GOTPCRel4 => elf::reloc::R_X86_64_GOTPCREL,
+                            _ => unimplemented!(),
+                        }
+                    }
+                    _ => unimplemented!("unsupported architecture: {}", triple),
+                },
+                // Most ELF relocations do not include an implicit addend.
+                0,
+            )
+        }
+        BinaryFormat::Macho => {
+            use goblin::mach;
+            match triple.architecture {
+                Architecture::X86_64 => {
+                    match reloc {
+                        Reloc::Abs8 => (u32::from(mach::relocation::R_ABS), 0),
+                        // Mach-O doesn't need us to distinguish between PC-relative calls
+                        // and PLT calls, but it does need us to distinguish between calls
+                        // and non-calls. And, it includes the 4-byte addend implicitly.
+                        Reloc::X86PCRel4 => (u32::from(mach::relocation::X86_64_RELOC_SIGNED), 4),
+                        Reloc::X86CallPCRel4 | Reloc::X86CallPLTRel4 => {
+                            (u32::from(mach::relocation::X86_64_RELOC_BRANCH), 4)
+                        }
+                        Reloc::X86GOTPCRel4 => {
+                            (u32::from(mach::relocation::X86_64_RELOC_GOT_LOAD), 4)
+                        }
+                        _ => unimplemented!("unsupported mach-o reloc: {}", reloc),
+                    }
+                }
+                _ => unimplemented!("unsupported architecture: {}", triple),
+            }
+        }
+        _ => unimplemented!("unsupported format"),
+    }
+}