1 files changed, 75 insertions, 0 deletions
diff --git a/vendor/github.com/jtolds/gls/stack_tags_js.go b/vendor/github.com/jtolds/gls/stack_tags_js.go
new file mode 100644
index 0000000..c4e8b80
--- /dev/null
+++ b/vendor/github.com/jtolds/gls/stack_tags_js.go
@@ -0,0 +1,75 @@
+// +build js
+
+package gls
+
+// This file is used for GopherJS builds, which don't have normal runtime
+// stack trace support
+
+import (
+	"strconv"
+	"strings"
+
+	"github.com/gopherjs/gopherjs/js"
+)
+
+const (
+	jsFuncNamePrefix = "github_com_jtolds_gls_mark"
+)
+
+func jsMarkStack() (f []uintptr) {
+	lines := strings.Split(
+		js.Global.Get("Error").New().Get("stack").String(), "\n")
+	f = make([]uintptr, 0, len(lines))
+	for i, line := range lines {
+		line = strings.TrimSpace(line)
+		if line == "" {
+			continue
+		}
+		if i == 0 {
+			if line != "Error" {
+				panic("didn't understand js stack trace")
+			}
+			continue
+		}
+		fields := strings.Fields(line)
+		if len(fields) < 2 || fields[0] != "at" {
+			panic("didn't understand js stack trace")
+		}
+
+		pos := strings.Index(fields[1], jsFuncNamePrefix)
+		if pos < 0 {
+			continue
+		}
+		pos += len(jsFuncNamePrefix)
+		if pos >= len(fields[1]) {
+			panic("didn't understand js stack trace")
+		}
+		char := string(fields[1][pos])
+		switch char {
+		case "S":
+			f = append(f, uintptr(0))
+		default:
+			val, err := strconv.ParseUint(char, 16, 8)
+			if err != nil {
+				panic("didn't understand js stack trace")
+			}
+			f = append(f, uintptr(val)+1)
+		}
+	}
+	return f
+}
+
+// variables to prevent inlining
+var (
+	findPtr = func() uintptr {
+		funcs := jsMarkStack()
+		if len(funcs) == 0 {
+			panic("failed to find function pointer")
+		}
+		return funcs[0]
+	}
+
+	getStack = func(offset, amount int) (stack []uintptr, next_offset int) {
+		return jsMarkStack(), 0
+	}
+)