Added address map instructions for traps in singlepass

lib/compiler-singlepass/src/address_map.rs

@@ -0,0 +1,23 @@
+// This file contains code from external sources.
+// Attributions: https://github.com/wasmerio/wasmer/blob/master/ATTRIBUTIONS.md
+
+use wasmer_compiler::{FunctionAddressMap, FunctionBodyData, InstructionAddressMap, SourceLoc};
+
+pub fn get_function_address_map<'data>(
+    instructions: Vec<InstructionAddressMap>,
+    data: &FunctionBodyData<'data>,
+    body_len: usize,
+) -> FunctionAddressMap {
+    // Generate artificial srcloc for function start/end to identify boundary
+    // within module. It will wrap around if byte code is larger than 4 GB.
+    let start_srcloc = SourceLoc::new(data.module_offset as u32);
+    let end_srcloc = SourceLoc::new((data.module_offset + data.data.len()) as u32);
+
+    FunctionAddressMap {
+        instructions,
+        start_srcloc,
+        end_srcloc,
+        body_offset: 0,
+        body_len,
+    }
+}

lib/compiler-singlepass/src/codegen_x64.rs

@@ -1,3 +1,4 @@
+use crate::address_map::get_function_address_map;
 use crate::{common_decl::*, config::Singlepass, emitter_x64::*, machine::Machine, x64_decl::*};
 use dynasmrt::{x64::Assembler, DynamicLabel};
 use smallvec::{smallvec, SmallVec};
@@ -8,8 +9,8 @@ use wasmer_compiler::wasmparser::{
 };
 use wasmer_compiler::{
     CompiledFunction, CompiledFunctionFrameInfo, CustomSection, CustomSectionProtection,
-    FunctionBody, Relocation, RelocationKind, RelocationTarget, SectionBody, SectionIndex,
+    FunctionBody, FunctionBodyData, InstructionAddressMap, Relocation, RelocationKind,
-    TrapInformation,
+    RelocationTarget, SectionBody, SectionIndex, SourceLoc, TrapInformation,
 };
 use wasmer_types::{
     entity::{EntityRef, PrimaryMap, SecondaryMap},
@@ -80,6 +81,12 @@ pub struct FuncGen<'a> {
 
     /// A set of special labels for trapping.
     special_labels: SpecialLabelSet,
+
+    /// The source location for the current operator
+    src_loc: u32,
+
+    /// All the InstructionAddressMap
+    instructions_address_map: Vec<InstructionAddressMap>,
 }
 
 struct SpecialLabelSet {
@@ -251,6 +258,11 @@ struct I2O1 {
 }
 
 impl<'a> FuncGen<'a> {
+    /// Set the source location of the Wasm to the given offset
+    pub fn set_srcloc(&mut self, offset: u32) {
+        self.src_loc = offset;
+    }
+
     fn get_location_released(&mut self, loc: Location) -> Location {
         self.machine.release_locations(&mut self.assembler, &[loc]);
         loc
@@ -306,6 +318,11 @@ impl<'a> FuncGen<'a> {
         for i in begin..end {
             self.trap_table.offset_to_code.insert(i, code);
         }
+        self.instructions_address_map.push(InstructionAddressMap {
+            srcloc: SourceLoc::new(self.src_loc),
+            code_offset: begin,
+            code_len: end - begin,
+        });
         ret
     }
 
@@ -313,6 +330,11 @@ impl<'a> FuncGen<'a> {
     fn mark_address_with_trap_code(&mut self, code: TrapCode) {
         let offset = self.assembler.get_offset().0;
         self.trap_table.offset_to_code.insert(offset, code);
+        self.instructions_address_map.push(InstructionAddressMap {
+            srcloc: SourceLoc::new(self.src_loc),
+            code_offset: offset,
+            code_len: 2, // TODO: Check this length
+        });
     }
 
     /// Canonicalizes the floating point value at `input` into `output`.
@@ -379,16 +401,28 @@ impl<'a> FuncGen<'a> {
             Location::Imm64(_) | Location::Imm32(_) => {
                 self.assembler.emit_mov(sz, loc, Location::GPR(GPR::RCX)); // must not be used during div (rax, rdx)
                 self.mark_trappable();
+                let offset = self.assembler.get_offset().0;
+                self.instructions_address_map.push(InstructionAddressMap {
+                    srcloc: SourceLoc::new(self.src_loc),
+                    code_offset: offset,
+                    code_len: 2, // TODO: Check this length
+                });
                 self.trap_table
                     .offset_to_code
-                    .insert(self.assembler.get_offset().0, TrapCode::IntegerOverflow);
+                    .insert(offset, TrapCode::IntegerOverflow);
                 op(&mut self.assembler, sz, Location::GPR(GPR::RCX));
             }
             _ => {
                 self.mark_trappable();
+                let offset = self.assembler.get_offset().0;
+                self.instructions_address_map.push(InstructionAddressMap {
+                    srcloc: SourceLoc::new(self.src_loc),
+                    code_offset: offset,
+                    code_len: 2, // TODO: Check this length
+                });
                 self.trap_table
                     .offset_to_code
-                    .insert(self.assembler.get_offset().0, TrapCode::IntegerOverflow);
+                    .insert(offset, TrapCode::IntegerOverflow);
                 op(&mut self.assembler, sz, loc);
             }
         }
@@ -1473,16 +1507,28 @@ impl<'a> FuncGen<'a> {
         );
 
         self.assembler.emit_label(trap_overflow);
+        let offset = self.assembler.get_offset().0;
+        self.instructions_address_map.push(InstructionAddressMap {
+            srcloc: SourceLoc::new(self.src_loc),
+            code_offset: offset,
+            code_len: 2, // TODO: Check this length
+        });
         self.trap_table
             .offset_to_code
-            .insert(self.assembler.get_offset().0, TrapCode::IntegerOverflow);
+            .insert(offset, TrapCode::IntegerOverflow);
         self.assembler.emit_ud2();
 
         self.assembler.emit_label(trap_badconv);
-        self.trap_table.offset_to_code.insert(
+
-            self.assembler.get_offset().0,
+        let offset = self.assembler.get_offset().0;
-            TrapCode::BadConversionToInteger,
+        self.instructions_address_map.push(InstructionAddressMap {
-        );
+            srcloc: SourceLoc::new(self.src_loc),
+            code_offset: offset,
+            code_len: 2, // TODO: Check this length
+        });
+        self.trap_table
+            .offset_to_code
+            .insert(offset, TrapCode::BadConversionToInteger);
         self.assembler.emit_ud2();
 
         self.assembler.emit_label(end);
@@ -1622,16 +1668,27 @@ impl<'a> FuncGen<'a> {
         );
 
         self.assembler.emit_label(trap_overflow);
+        let offset = self.assembler.get_offset().0;
+        self.instructions_address_map.push(InstructionAddressMap {
+            srcloc: SourceLoc::new(self.src_loc),
+            code_offset: offset,
+            code_len: 2, // TODO: Check this length
+        });
         self.trap_table
             .offset_to_code
-            .insert(self.assembler.get_offset().0, TrapCode::IntegerOverflow);
+            .insert(offset, TrapCode::IntegerOverflow);
         self.assembler.emit_ud2();
 
         self.assembler.emit_label(trap_badconv);
-        self.trap_table.offset_to_code.insert(
+        let offset = self.assembler.get_offset().0;
-            self.assembler.get_offset().0,
+        self.instructions_address_map.push(InstructionAddressMap {
-            TrapCode::BadConversionToInteger,
+            srcloc: SourceLoc::new(self.src_loc),
-        );
+            code_offset: offset,
+            code_len: 2, // TODO: Check this length
+        });
+        self.trap_table
+            .offset_to_code
+            .insert(offset, TrapCode::BadConversionToInteger);
         self.assembler.emit_ud2();
 
         self.assembler.emit_label(end);
@@ -1819,6 +1876,8 @@ impl<'a> FuncGen<'a> {
             trap_table: TrapTable::default(),
             relocations: vec![],
             special_labels,
+            src_loc: 0,
+            instructions_address_map: vec![],
         };
         fg.emit_head()?;
         Ok(fg)
@@ -6128,10 +6187,15 @@ impl<'a> FuncGen<'a> {
             }
             Operator::Unreachable => {
                 self.mark_trappable();
-                self.trap_table.offset_to_code.insert(
+                let offset = self.assembler.get_offset().0;
-                    self.assembler.get_offset().0,
+                self.instructions_address_map.push(InstructionAddressMap {
-                    TrapCode::UnreachableCodeReached,
+                    srcloc: SourceLoc::new(self.src_loc),
-                );
+                    code_offset: offset,
+                    code_len: 2, // TODO: Check this length
+                });
+                self.trap_table
+                    .offset_to_code
+                    .insert(offset, TrapCode::UnreachableCodeReached);
                 self.assembler.emit_ud2();
                 self.unreachable_depth = 1;
             }
@@ -8125,7 +8189,7 @@ impl<'a> FuncGen<'a> {
         Ok(())
     }
 
-    pub fn finalize(mut self) -> CompiledFunction {
+    pub fn finalize(mut self, data: &FunctionBodyData) -> CompiledFunction {
         // Generate actual code for special labels.
         self.assembler
             .emit_label(self.special_labels.integer_division_by_zero);
@@ -8153,6 +8217,11 @@ impl<'a> FuncGen<'a> {
 
         // Notify the assembler backend to generate necessary code at end of function.
         self.assembler.finalize_function();
+
+        let body_len = self.assembler.get_offset().0;
+        let instructions_address_map = self.instructions_address_map;
+        let address_map = get_function_address_map(instructions_address_map, data, body_len);
+
         CompiledFunction {
             body: FunctionBody {
                 body: self.assembler.finalize().unwrap().to_vec(),
@@ -8170,7 +8239,7 @@ impl<'a> FuncGen<'a> {
                         trap_code: code,
                     })
                     .collect(),
-                ..Default::default()
+                address_map,
             },
         }
     }

lib/compiler-singlepass/src/compiler.rs

@@ -106,11 +106,12 @@ impl Compiler for SinglepassCompiler {
                 .map_err(to_compile_error)?;
 
                 while generator.has_control_frames() {
+                    generator.set_srcloc(reader.original_position() as u32);
                     let op = reader.read_operator().map_err(to_compile_error)?;
                     generator.feed_operator(op).map_err(to_compile_error)?;
                 }
 
-                Ok(generator.finalize())
+                Ok(generator.finalize(&input))
             })
             .collect::<Result<Vec<CompiledFunction>, CompileError>>()?
             .into_iter()

lib/compiler-singlepass/src/lib.rs

@@ -8,6 +8,7 @@
 //! Compared to Cranelift and LLVM, Singlepass compiles much faster but has worse
 //! runtime performance.
 
+mod address_map;
 mod codegen_x64;
 mod common_decl;
 mod compiler;