Fix display of shadowed variables while debugging

src/debugAdapter/goDebug.ts

@@ -45,6 +45,14 @@ enum GoReflectKind {
  UnsafePointer
 }
 
+enum GoVariableFlags {
+ VariableEscaped = 1,
+ VariableShadowed = 2,
+ VariableConstant = 4,
+ VariableArgument = 8,
+ VariableReturnArgument = 16
+}
+
 // These types should stay in sync with:
 // https://github.com/derekparker/delve/blob/master/service/api/types.go
 
@@ -149,6 +157,8 @@ interface DebugVariable {
  type: string;
  realType: string;
  kind: GoReflectKind;
+ flags: GoVariableFlags;
+ DeclLine: number;
  value: string;
  len: number;
  cap: number;
@@ -843,14 +853,44 @@ class GoDebugSession extends LoggingDebugSession {
  log('functionArgs', args);
  this.addFullyQualifiedName(args);
  let vars = args.concat(locals);
-
+ // annotate shadowed variables in parentheses
+ const shadowedVars = new Map<string, Array<number>>();
+ for (let i = 0; i < vars.length; ++i) {
+ if ((vars[i].flags & GoVariableFlags.VariableShadowed) === 0) {
+ continue;
+ }
+ const varName = vars[i].name;
+ if (!shadowedVars.has(varName)) {
+ const indices = new Array<number>();
+ indices.push(i);
+ shadowedVars.set(varName, indices);
+ } else {
+ shadowedVars.get(varName).push(i);
+ }
+ }
+ for (const svIndices of shadowedVars.values()) {
+ // sort by declared line number in descending order
+ svIndices.sort((lhs: number, rhs: number) => {
+ return vars[rhs].DeclLine - vars[lhs].DeclLine;
+ });
+ // enclose in parentheses, one pair per scope
+ for (let scope = 0; scope < svIndices.length; ++scope) {
+ const svIndex = svIndices[scope];
+ // start at -1 so scope of 0 has one pair of parens
+ for (let count = -1; count < scope; ++count) {
+ vars[svIndex].name = `(${vars[svIndex].name})`;
+ }
+ }
+ }
  let scopes = new Array<Scope>();
  let localVariables = {
  name: 'Local',
  addr: 0,
  type: '',
  realType: '',
  kind: 0,
+ flags: 0,
+ DeclLine: 0,
  value: '',
  len: 0,
  cap: 0,
@@ -899,6 +939,8 @@ class GoDebugSession extends LoggingDebugSession {
  type: '',
  realType: '',
  kind: 0,
+ flags: 0,
+ DeclLine: 0,
  value: '',
  len: 0,
  cap: 0,